1. A piston (100) for reducing engine oil consumption for an internal combustion engine, the piston (100) comprising: a cylindrical piston body (102) operatively coupled to a connecting arm and configured to reciprocate within a cylinder bore; a piston crown (104) defining a combustion bowl; a ring belt portion (106) comprising at least a compression ring groove (108) and an oil scraper ring groove (110); a plurality of oil drain holes (112) formed in the oil scraper ring groove (110) and extending through the cylindrical piston body (102), wherein the plurality of oil drain holes (112) are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl, wherein the plurality of oil drain holes (112) are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure, wherein the piston (100) is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly.

2. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) are circumferentially spaced around the oil scraper ring groove (110).

3. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) are formed on opposite sides of the cylindrical piston body (102).

4. The piston (100) as claimed in claim 1, wherein each oil drain hole has a diameter of about 4 mm.

5. The piston (100) as claimed in claim 1, wherein each oil drain hole is oriented at an angle of about 40° relative to a longitudinal axis of the piston (100).

6. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) fluidly communicates with an interior oil return passage of the piston (100) to direct lubricating oil toward the engine sump.

7. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) are configured to increase lubricating oil flow toward a piston pin bore region of the cylindrical piston body (102).

8. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) are arranged symmetrically with respect to a central axis of the piston (100).

9. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) are configured to prevent accumulation of lubricating oil within the oil scraper ring groove (110) during engine operation.

10. A method for providing a piston (100) for reducing engine oil consumption for an internal combustion engine, the method comprising: coupling a cylindrical piston body (102) operatively to a connecting arm and the cylindrical piston body (102) being configured to reciprocate within a cylinder bore; providing a piston crown (104) defining a combustion bowl; providing a ring belt portion (106) comprising at least a compression ring groove (108) and an oil scraper ring groove (110); forming a plurality of oil drain holes (112) in the oil scraper ring groove (110) and the plurality of oil drain holes (112) extends through the cylindrical piston body (102), wherein the plurality of oil drain holes (112) are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl, wherein the plurality of oil drain holes (112) are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure, wherein the piston (100) is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly.

Description:A PISTON FOR REDUCING ENGINE OIL CONSUMPTION FOR AN INTERNAL COMBUSTION ENGINE
FIELD OF THE DISCLOSURE
[0001] This invention generally relates to a field of a combustion system for vehicles, and in particular, to a piston for reducing engine oil consumption for an internal combustion engine and method thereof.
BACKGROUND
[0002] The subject matter discussed in the background section should not be assumed to be prior art merely as a result of its mention in the background section. Similarly, a problem mentioned in the background section or associated with the subject matter of the background section should not be assumed to have been previously recognized in the prior art. The subject matter in the background section merely represents different approaches, which in and of themselves may also correspond to implementations of the claimed technology.
[0003] Pistons are widely employed in internal combustion engines to transmit combustion forces to a connecting rod while also facilitating sealing, heat transfer, and lubrication within a cylinder bore. In many medium- and heavy-duty internal combustion engines, cast iron pistons, such as nodular cast iron (NCI) pistons, are commonly used due to their structural strength, durability, and suitability for high-load operating conditions.
[0004] In conventional heavy-duty engine configurations, engine oil is supplied to a piston cooling gallery and is expected to flow toward a small end of the connecting rod to lubricate a piston pin and a conrod bushing. Proper lubrication at the small end of the connecting rod is critical for preventing excessive wear, overheating, and seizure during prolonged engine operation under high loads.
[0005] However, in existing NCI piston designs, oil drain holes provided in the piston cooling gallery are often limited in size and orientation, resulting in insufficient oil flow toward the conrod small end. As a result, lubrication of the piston pin and the conrod bushing becomes inadequate, which can lead to seizure of the piston pin and conrod bushing and may ultimately cause severe engine damage or engine failure.
[0006] Additionally, conventional NCI piston designs are associated with high engine oil consumption during operation. In such pistons, an oil scraper ring is configured to scrape excess lubricating oil from a cylinder liner and retain the scraped oil within an oil scraper ring groove. In the absence of effective oil drain paths from the ring groove, the scraped oil tends to accumulate within the groove region.
[0007] During reciprocating motion of the piston, the accumulated oil within the oil scraper ring groove may intermittently escape and migrate toward a combustion bowl defined by a piston crown. Entry of engine oil into the combustion chamber results in oil burning during combustion, thereby increasing engine oil consumption and contributing to undesirable exhaust emissions.
[0008] Conventional approaches to address lubrication deficiencies or high oil consumption in heavy-duty engines often require substantial redesign of piston geometry, ring pack configurations, or oil supply systems. Such modifications may increase manufacturing complexity, development cost, and validation effort, particularly when applied to existing engine platforms.
[0009] Another the patent application, “WO2022068054A1,” titled “Connecting-rod bushing structure,” describes A connecting-rod bushing structure, which relates to an engine and is mainly solves the technical problem of the poor lubrication of an existing connecting-rod bushing. The connecting-rod bushing structure comprises a piston (1), a connecting rod (2) and a bushing (3), wherein a connecting-rod small end (4) of the connecting rod (2) is rotationally connected to the piston (1) via the bushing (3) and a piston pin (5); two sides of the top of the bushing (3) are respectively provided with a bushing oil intake hole (6); the connecting-rod small end (4) is internally provided with connecting-rod oil intake holes (7) corresponding to the bushing oil intake holes (6); the piston (1) is internally provided with oil output holes (8) corresponding to the connecting-rod oil intake holes (7); and the oil output holes (8) are in communication with an oil channel (9) in the piston (1). By means of providing the bushing oil intake holes (6), the connecting-rod oil intake holes (7) and the oil output holes (8), lubricating oil in the oil channel (9) in the piston (1) sequentially passes through the oil output holes (8), the connecting-rod oil intake holes (7) and the bushing oil intake holes (6) and then enters the inside of the bushing (3), such that the lubricating effect of the bushing (3) can be effectively improved..
[0010] Another patent application, "CN202402156U," titled "Engine steel piston with through oil hole," describes an engine steel piston with a through oil hole, which comprises a piston body, a combustion chamber, an inner cooling oil channel and an inner cavity, wherein an oil hole penetrates through an inner cavity from the inner cooling oil channel; the included angle alpha between a central line of the oil hole and the central line of a piston is equal to 30-50 degrees; the diameter phi D of the oil hole is equal to 2.5-5.5mm; and lubricating oil flows through the oil hole and the inner cavity of the piston from the inner cooling oil channel, and then reaches the upper surface of a connecting rod, and finally flows into the outer surface of a piston pin so as to improve the lubrication of the piston pin and the connecting rod and the lubrication of the piston pin and the piston. According to the engine steel piston, the forced lubrication between a steel piston pin hole and the steel piston is realized, the lubrication between the piston pin and the pin hole can be improved, and hazards of invalidity of the meshing of the piston pin and the pin hole and the like can be lowered effectively; and meanwhile, auxiliary effects generated by the utility model can perform forced lubrication between a small head hole of the connecting rod and the piston pin, and can replace the design that a long oil hole penetrates through a large head of the connecting rod and a small head of the connecting rod, and the processing cost and the manufacturing cost are lowered greatly.
[0011] In conventional heavy-duty internal combustion engines employing cast iron pistons, challenges related to insufficient lubrication of a piston pin and conrod bushing, as well as elevated engine oil consumption, are typically addressed through incremental changes to oil supply systems, ring pack configurations, or piston geometries. However, such conventional approaches exhibit several limitations in ensuring adequate oil delivery to a conrod small end while simultaneously preventing oil migration toward a combustion chamber. In particular, existing piston designs are ineffective in providing controlled drainage of lubricating oil from an oil scraper ring groove and in directing sufficient oil flow from a piston cooling gallery toward a piston pin and bushing region, leading to localized oil starvation, increased friction, and a higher risk of piston pin or conrod bushing seizure under high-load operating conditions. Additionally, accumulated oil within the oil scraper ring groove in conventional pistons may re-enter the combustion chamber during piston reciprocation, resulting in increased oil burning and elevated engine oil consumption. Attempts to mitigate these issues often require substantial redesign of piston assemblies or ancillary lubrication components, which may be identified only after durability failures, excessive oil consumption, or field reliability concerns arise during engine validation or operation. As a result, conventional piston design strategies increase development effort, validation time, and manufacturing complexity, while limiting durability, efficiency, and reliability of heavy-duty engine platforms.
OBJECTIVES OF THE INVENTION
[0012] The objective of the present invention is to provide a piston configuration for an internal combustion engine that is easily adaptable to existing engine platforms without requiring significant changes to engine architecture or assembly processes.
[0013] The objective of the present invention is to improve lubrication of a piston pin and a connecting rod bushing so as to prevent seizure of the piston pin and connecting rod bearing during engine operation.
[0014] The objective of the present invention is to reduce engine oil consumption by limiting migration of lubricating oil from an oil scraper ring groove toward a combustion bowl.
[0015] The objective of the present invention is to enhance controlled drainage of lubricating oil from an oil scraper ring groove toward an engine sump during piston reciprocation.
[0016] The objective of the present invention is to increase effective oil flow from a piston cooling region toward a small end of a connecting rod to ensure adequate lubrication under high-load operating conditions.
[0017] The objective of the present invention is to improve piston cooling efficiency so as to enhance durability and thermal stability of the piston during prolonged engine operation.
[0018] The objective of the present invention is to achieve the foregoing objectives without introducing complex piston geometries or additional lubrication components.
[0019] The objective of the present invention is to provide a robust and reliable piston solution that minimizes the risk of bearing failure while maintaining compatibility with existing ring pack configurations.
[0020] The objective of the present invention is to deliver a cost-effective, manufacturable, and easily implementable piston design that improves engine durability and reduces oil-related failures in heavy-duty internal combustion engines.
SUMMARY
[0021] The present invention relates to a piston for reducing engine oil consumption for an internal combustion engine.
[0022] According to an aspect, a piston for reducing engine oil consumption for an internal combustion engine is disclosed. The piston comprises a cylindrical piston body operatively coupled to a connecting arm and configured to reciprocate within a cylinder bore. The piston further comprises a piston crown defining a combustion bowl. The piston further comprises a ring belt portion comprising at least a compression ring groove and an oil scraper ring groove. The piston further comprises a plurality of oil drain holes formed in the oil scraper ring groove and extending through the cylindrical piston body. Further, the plurality of oil drain holes are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl. Further, the plurality of oil drain holes are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure. Further, the piston is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly.
[0023] According to another aspect, a method for providing a piston for reducing engine oil consumption for an internal combustion engine. The method comprises steps of coupling a cylindrical piston body operatively to a connecting arm and the cylindrical piston body being configured to reciprocate within a cylinder bore. The method further comprises steps of providing a piston crown defining a combustion bowl. The method further comprises steps of providing a ring belt portion comprising at least a compression ring groove and an oil scraper ring groove. The method further comprises steps of forming a plurality of oil drain holes in the oil scraper ring groove and the plurality of oil drain holes extends through the cylindrical piston body. Further, the plurality of oil drain holes are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl. Further, the plurality of oil drain holes are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure. Further, the piston is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The accompanying drawings illustrate various embodiments of systems, methods, and embodiments of various other aspects of the disclosure. Any person with ordinary skills in the art will appreciate that the illustrated element boundaries (e.g., boxes, groups of boxes, or other shapes) in the figures represent one example of the boundaries. It may be that in some examples one element may be designed as multiple elements or that multiple elements may be designed as one element. In some examples, an element shown as an internal component of one element may be implemented as an external component in another, and vice versa. Furthermore, elements may not be drawn to scale. Non-limiting and non-exhaustive descriptions are described with reference to the following drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating principles.
[0025] FIG. 1 illustrates a side view of a piston for reducing engine oil consumption for an internal combustion engine, according to an embodiment of the present disclosure; and
[0026] FIG. 2 illustrates a flowchart showing a method for providing a piston for reducing engine oil consumption for an internal combustion engine, according to an embodiment of the present disclosure.
DETAILED DESCRIPTION
[0027] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words “comprising,” “having,” “containing,” and “including,” and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise.
[0028] Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the preferred, systems and methods are now described. Embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings in which like numerals represent like elements throughout the several figures, and in which example embodiments are shown. Embodiments of the claims may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The examples set forth herein are non-limiting examples and are merely examples among other possible examples.
[0029] The present invention discloses various embodiments of a piston for reducing engine oil consumption for an internal combustion engine. Embodiments of the present invention comprises a cylindrical piston body operatively coupled to a connecting arm and configured to reciprocate within a cylinder bore. Embodiments of the present invention further comprises a piston crown defining a combustion bowl. Embodiments of the present invention further comprises a ring belt portion comprising at least a compression ring groove and an oil scraper ring groove. Embodiments of the present invention further comprises a plurality of oil drain holes formed in the oil scraper ring groove and extending through the cylindrical piston body. Further, the plurality of oil drain holes are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl. Further, the plurality of oil drain holes are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure. Further, the piston is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly.
[0030] FIG. 1 illustrates a side view of a piston (100) for reducing engine oil consumption for an internal combustion engine, according to an embodiment of the present disclosure.
[0031] In some embodiments, a piston (100) for reducing engine oil consumption for an internal combustion engine comprises a cylindrical piston body (102) operatively coupled to a connecting arm and configured to reciprocate within a cylinder bore. The piston (100) is adapted to cooperate with a cylinder head to define a combustion chamber during engine operation. The cylindrical piston body (102) supports axial and radial loads generated during combustion and reciprocating motion. The piston crown (104) forms an upper portion of the piston (100) exposed to combustion gases. The piston crown (104) defines a combustion bowl configured to receive and contain combustion energy. The disclosed piston configuration is particularly suitable for heavy-duty internal combustion engines operating under high load conditions.
[0032] In some embodiments, the piston (100) further comprises a ring belt portion (106) formed along an outer peripheral region of the cylindrical piston body (102). The ring belt portion (106) comprises at least a compression ring groove (108) and an oil scraper ring groove (110) arranged axially along the cylindrical piston body (102). The compression ring groove (108) is configured to receive a compression ring for sealing combustion gases within the combustion chamber. The oil scraper ring groove (110) is configured to receive an oil scraper ring for controlling lubricating oil on a cylinder liner. The ring belt portion (106) enables effective sealing, oil control, and heat transfer during engine operation. The configuration is compatible with conventional ring pack arrangements.
[0033] In some embodiments, a plurality of oil drain holes (112) are formed in the oil scraper ring groove (110) and extend through the cylindrical piston body (102). The plurality of oil drain holes (112) provide a drainage path for lubricating oil scraped from the cylinder liner by the oil scraper ring. During piston reciprocation, oil collected in the oil scraper ring groove (110) is directed through the plurality of oil drain holes (112). The plurality of oil drain holes (112) enable controlled evacuation of excess oil from the ring groove region. This configuration reduces the tendency of oil to migrate toward the combustion bowl. As a result, engine oil consumption is reduced during sustained engine operation.
[0034] In some embodiments, the plurality of oil drain holes (112) are configured to drain lubricating oil toward an engine sump. The oil scraped by the oil scraper ring is guided through the plurality of oil drain holes (112) and directed away from the piston crown (104) region. By reducing oil retention within the oil scraper ring groove (110), re-entry of oil into the combustion chamber during piston motion is minimized. This reduces oil burning during combustion. Lower oil burning contributes to reduced engine oil consumption and improved exhaust characteristics. The controlled drainage also stabilizes oil control performance across operating conditions.
[0035] In some embodiments, the plurality of oil drain holes (112) are further configured to increase lubricating oil flow toward a small end of the connecting rod. Oil drained through the cylindrical piston body (102) is directed toward a piston pin and bushing region. Increased oil flow improves lubrication of the piston pin assembly during high-load and high-temperature operation. Improved lubrication reduces friction and wear at the connecting rod small end. Adequate oil supply prevents seizure of the piston pin and bushing. This enhances engine reliability and durability.
[0036] In some embodiments, the plurality of oil drain holes (112) are circumferentially spaced around the oil scraper ring groove (110). Circumferential spacing ensures uniform drainage of lubricating oil from the oil scraper ring groove (110). Uniform oil drainage prevents localized oil accumulation within the groove. The circumferential arrangement maintains balanced oil flow around the cylindrical piston body (102). This configuration improves consistency of oil control during piston reciprocation. Even drainage supports stable lubrication behavior throughout engine operation.
[0037] In some embodiments, the plurality of oil drain holes (112) are formed on opposite sides of the cylindrical piston body (102). Placement on opposite sides enables balanced oil discharge paths within the piston structure. Balanced oil flow reduces asymmetric oil loading on the cylindrical piston body (102). The opposing arrangement assists in directing oil toward both sides of the piston pin region. This improves lubrication uniformity across the piston pin and bushing interface. The configuration contributes to reduced localized wear and improved durability.
[0038] In some embodiments, each oil drain hole has a diameter of about 4 millimeters. The increased diameter allows a higher volume of lubricating oil to pass through the plurality of oil drain holes (112). Improved oil flow capacity enhances drainage efficiency from the oil scraper ring groove (110). The larger diameter supports rapid evacuation of oil during high-speed piston motion. Enhanced oil flow improves lubrication delivery to the piston pin assembly. The diameter selection balances effective drainage with structural integrity of the cylindrical piston body (102).
[0039] In some embodiments, each oil drain hole is oriented at an angle of about 40 degrees relative to a longitudinal axis of the piston (100). The angular orientation facilitates directed oil flow toward the engine sump and the connecting rod small end. Angled holes improve the momentum of oil flow during piston reciprocation. This orientation enhances oil delivery efficiency compared to perpendicular drainage paths. The angular configuration assists in reducing oil splash toward the combustion bowl. As a result, oil control and lubrication performance are improved.
[0040] In some embodiments, the plurality of oil drain holes (112) fluidly communicates with an interior oil return passage of the piston (100). The oil return passage directs drained lubricating oil toward the engine sump. Fluid communication between the plurality of oil drain holes (112) and the oil return passage ensures controlled oil routing. This arrangement prevents random oil dispersion within the cylindrical piston body (102). Efficient oil return contributes to stable lubrication system performance. The configuration supports continuous oil circulation during engine operation.
[0041] In some embodiments, the plurality of oil drain holes (112) are configured to increase lubricating oil flow toward a piston pin bore region of the cylindrical piston body (102). The piston pin bore region receives oil discharged through the plurality of oil drain holes (112). Enhanced oil delivery improves hydrodynamic lubrication between the piston pin and bushing. Improved lubrication reduces metal-to-metal contact during reciprocating motion. This minimizes wear and reduces the risk of bearing seizure. The configuration improves long-term durability of the piston pin assembly.
[0042] In some embodiments, the plurality of oil drain holes (112) are arranged symmetrically with respect to a central axis of the piston (100). Symmetrical arrangement ensures balanced oil flow distribution within the cylindrical piston body (102). Balanced oil flow prevents uneven thermal and lubrication conditions. Symmetry contributes to uniform wear characteristics of the piston pin and bushing. The arrangement enhances mechanical stability during high-speed operation. Uniform oil distribution improves overall engine reliability.
[0043] In some embodiments, the plurality of oil drain holes (112) are configured to prevent accumulation of lubricating oil within the oil scraper ring groove (110) during engine operation. Continuous drainage avoids oil pooling in the ring groove region. Reduced oil accumulation limits oil migration toward the combustion bowl during piston motion. This minimizes oil burning during combustion cycles. Preventing oil accumulation improves oil control efficiency. The piston (100) thereby achieves reduced engine oil consumption and improved lubrication performance.
[0044] FIG. 2 illustrates a flowchart showing a method (200) for providing a piston (100) for reducing engine oil consumption for an internal combustion engine, according to an embodiment of the present disclosure.
[0045] At operation 202, the cylindrical piston body (102) is operatively coupled to the connecting arm and the cylindrical piston body (102) being configured to reciprocate within the cylinder bore. The piston (100) is adapted to cooperate with a cylinder head to define a combustion chamber during engine operation. The cylindrical piston body (102) supports axial and radial loads generated during combustion and reciprocating motion. The disclosed piston configuration is particularly suitable for heavy-duty internal combustion engines operating under high load conditions.
[0046] At operation 204, the piston crown (104) is provided defining a combustion bowl. The piston crown (104) forms an upper portion of the piston (100) exposed to combustion gases.
[0047] At operation 206, the ring belt portion (106) is provided comprising the at least a compression ring groove (108) and the oil scraper ring groove (110). The compression ring groove (108) is configured to receive a compression ring for sealing combustion gases within the combustion chamber.
[0048] At operation 208, the plurality of oil drain holes (112) is formed in the oil scraper ring groove (110) and the plurality of oil drain holes (112) extends through the cylindrical piston body (102). Further, the plurality of oil drain holes (112) are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl. Further, the plurality of oil drain holes (112) are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure. Further, the piston (100) is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly.
[0049] The plurality of oil drain holes (112) provide a drainage path for lubricating oil scraped from the cylinder liner by the oil scraper ring. During piston reciprocation, oil collected in the oil scraper ring groove (110) is directed through the plurality of oil drain holes (112). The plurality of oil drain holes (112) enable controlled evacuation of excess oil from the ring groove region. This configuration reduces the tendency of oil to migrate toward the combustion bowl. As a result, engine oil consumption is reduced during sustained engine operation.
[0050] In some embodiments, the plurality of oil drain holes (112) are configured to drain lubricating oil toward an engine sump. The oil scraped by the oil scraper ring is guided through the plurality of oil drain holes (112) and directed away from the piston crown (104) region. By reducing oil retention within the oil scraper ring groove (110), re-entry of oil into the combustion chamber during piston motion is minimized. This reduces oil burning during combustion. Lower oil burning contributes to reduced engine oil consumption and improved exhaust characteristics. The controlled drainage also stabilizes oil control performance across operating conditions.
[0051] In some embodiments, the plurality of oil drain holes (112) are further configured to increase lubricating oil flow toward a small end of the connecting rod. Oil drained through the cylindrical piston body (102) is directed toward a piston pin and bushing region. Increased oil flow improves lubrication of the piston pin assembly during high-load and high-temperature operation. Improved lubrication reduces friction and wear at the connecting rod small end. Adequate oil supply prevents seizure of the piston pin and bushing. This enhances engine reliability and durability.
[0052] In some embodiments, the plurality of oil drain holes (112) are circumferentially spaced around the oil scraper ring groove (110). Circumferential spacing ensures uniform drainage of lubricating oil from the oil scraper ring groove (110). Uniform oil drainage prevents localized oil accumulation within the groove. The circumferential arrangement maintains balanced oil flow around the cylindrical piston body (102). This configuration improves consistency of oil control during piston reciprocation. Even drainage supports stable lubrication behavior throughout engine operation.
[0053] In some embodiments, the plurality of oil drain holes (112) are formed on opposite sides of the cylindrical piston body (102). Placement on opposite sides enables balanced oil discharge paths within the piston structure. Balanced oil flow reduces asymmetric oil loading on the cylindrical piston body (102). The opposing arrangement assists in directing oil toward both sides of the piston pin region. This improves lubrication uniformity across the piston pin and bushing interface. The configuration contributes to reduced localized wear and improved durability.
[0054] In some embodiments, each oil drain hole has a diameter of about 4 millimeters. The increased diameter allows a higher volume of lubricating oil to pass through the plurality of oil drain holes (112). Improved oil flow capacity enhances drainage efficiency from the oil scraper ring groove (110). The larger diameter supports rapid evacuation of oil during high-speed piston motion. Enhanced oil flow improves lubrication delivery to the piston pin assembly. The diameter selection balances effective drainage with structural integrity of the cylindrical piston body (102).
[0055] In some embodiments, each oil drain hole is oriented at an angle of about 40 degrees relative to a longitudinal axis of the piston (100). The angular orientation facilitates directed oil flow toward the engine sump and the connecting rod small end. Angled holes improve the momentum of oil flow during piston reciprocation. This orientation enhances oil delivery efficiency compared to perpendicular drainage paths. The angular configuration assists in reducing oil splash toward the combustion bowl. As a result, oil control and lubrication performance are improved.
[0056] In some embodiments, the plurality of oil drain holes (112) fluidly communicates with an interior oil return passage of the piston (100). The oil return passage directs drained lubricating oil toward the engine sump. Fluid communication between the plurality of oil drain holes (112) and the oil return passage ensures controlled oil routing. This arrangement prevents random oil dispersion within the cylindrical piston body (102). Efficient oil return contributes to stable lubrication system performance. The configuration supports continuous oil circulation during engine operation.
[0057] In some embodiments, the plurality of oil drain holes (112) are configured to increase lubricating oil flow toward a piston pin bore region of the cylindrical piston body (102). The piston pin bore region receives oil discharged through the plurality of oil drain holes (112). Enhanced oil delivery improves hydrodynamic lubrication between the piston pin and bushing. Improved lubrication reduces metal-to-metal contact during reciprocating motion. This minimizes wear and reduces the risk of bearing seizure. The configuration improves long-term durability of the piston pin assembly.
[0058] In some embodiments, the plurality of oil drain holes (112) are arranged symmetrically with respect to a central axis of the piston (100). Symmetrical arrangement ensures balanced oil flow distribution within the cylindrical piston body (102). Balanced oil flow prevents uneven thermal and lubrication conditions. Symmetry contributes to uniform wear characteristics of the piston pin and bushing. The arrangement enhances mechanical stability during high-speed operation. Uniform oil distribution improves overall engine reliability.
[0059] In some embodiments, the plurality of oil drain holes (112) are configured to prevent accumulation of lubricating oil within the oil scraper ring groove (110) during engine operation. Continuous drainage avoids oil pooling in the ring groove region. Reduced oil accumulation limits oil migration toward the combustion bowl during piston motion. This minimizes oil burning during combustion cycles. Preventing oil accumulation improves oil control efficiency. The piston (100) thereby achieves reduced engine oil consumption and improved lubrication performance.
[0060]  Various embodiments of the present invention provide notable advantages through a piston (100) for reducing engine oil consumption in an internal combustion engine. The piston (100) provides an easily adaptable solution that can be implemented within existing engine platforms without requiring changes to a cylindrical piston body (102), a piston crown (104), or a ring belt portion (106) comprising a compression ring groove (108) and an oil scraper ring groove (110). The piston (100) improves lubricating oil flow from a piston cooling region through a plurality of oil drain holes (112) formed in the oil scraper ring groove (110) and extending through the cylindrical piston body (102) toward a small end of a connecting rod. Enhanced oil delivery improves lubrication of a piston pin and bushing, thereby reducing friction, wear, and the likelihood of bearing seizure during engine operation. Additionally, the plurality of oil drain holes (112) are configured to reduce lubricating oil flow toward a combustion bowl defined by the piston crown (104) by efficiently draining oil scraped from a cylinder liner toward an engine sump. Reduction of oil migration toward the combustion bowl minimizes oil burning during combustion and results in reduced engine oil consumption. Overall, the piston (100) delivers improved lubrication performance, reduced oil consumption, enhanced durability, and ease of integration, providing a reliable and cost-effective solution for internal combustion engine applications.
[0061] It has thus been seen the piston (100) for reducing engine oil consumption for an internal combustion engine, as described. The piston (100) in any case could undergo numerous modifications and variants, all of which are covered by the same innovative concept; moreover, all of the details can be replaced by technically equivalent elements. In practice, the components used, as well as the numbers, shapes, and sizes of the components can be whatever according to the technical requirements. The scope of protection of the invention is therefore defined by the attached claims.
, Claims:A PISTON FOR REDUCING ENGINE OIL CONSUMPTION FOR AN INTERNAL COMBUSTION ENGINE
FIELD OF THE DISCLOSURE
[0001] This invention generally relates to a field of a combustion system for vehicles, and in particular, to a piston for reducing engine oil consumption for an internal combustion engine and method thereof.
BACKGROUND
[0002] The subject matter discussed in the background section should not be assumed to be prior art merely as a result of its mention in the background section. Similarly, a problem mentioned in the background section or associated with the subject matter of the background section should not be assumed to have been previously recognized in the prior art. The subject matter in the background section merely represents different approaches, which in and of themselves may also correspond to implementations of the claimed technology.
[0003] Pistons are widely employed in internal combustion engines to transmit combustion forces to a connecting rod while also facilitating sealing, heat transfer, and lubrication within a cylinder bore. In many medium- and heavy-duty internal combustion engines, cast iron pistons, such as nodular cast iron (NCI) pistons, are commonly used due to their structural strength, durability, and suitability for high-load operating conditions.
[0004] In conventional heavy-duty engine configurations, engine oil is supplied to a piston cooling gallery and is expected to flow toward a small end of the connecting rod to lubricate a piston pin and a conrod bushing. Proper lubrication at the small end of the connecting rod is critical for preventing excessive wear, overheating, and seizure during prolonged engine operation under high loads.
[0005] However, in existing NCI piston designs, oil drain holes provided in the piston cooling gallery are often limited in size and orientation, resulting in insufficient oil flow toward the conrod small end. As a result, lubrication of the piston pin and the conrod bushing becomes inadequate, which can lead to seizure of the piston pin and conrod bushing and may ultimately cause severe engine damage or engine failure.
[0006] Additionally, conventional NCI piston designs are associated with high engine oil consumption during operation. In such pistons, an oil scraper ring is configured to scrape excess lubricating oil from a cylinder liner and retain the scraped oil within an oil scraper ring groove. In the absence of effective oil drain paths from the ring groove, the scraped oil tends to accumulate within the groove region.
[0007] During reciprocating motion of the piston, the accumulated oil within the oil scraper ring groove may intermittently escape and migrate toward a combustion bowl defined by a piston crown. Entry of engine oil into the combustion chamber results in oil burning during combustion, thereby increasing engine oil consumption and contributing to undesirable exhaust emissions.
[0008] Conventional approaches to address lubrication deficiencies or high oil consumption in heavy-duty engines often require substantial redesign of piston geometry, ring pack configurations, or oil supply systems. Such modifications may increase manufacturing complexity, development cost, and validation effort, particularly when applied to existing engine platforms.
[0009] Another the patent application, “WO2022068054A1,” titled “Connecting-rod bushing structure,” describes A connecting-rod bushing structure, which relates to an engine and is mainly solves the technical problem of the poor lubrication of an existing connecting-rod bushing. The connecting-rod bushing structure comprises a piston (1), a connecting rod (2) and a bushing (3), wherein a connecting-rod small end (4) of the connecting rod (2) is rotationally connected to the piston (1) via the bushing (3) and a piston pin (5); two sides of the top of the bushing (3) are respectively provided with a bushing oil intake hole (6); the connecting-rod small end (4) is internally provided with connecting-rod oil intake holes (7) corresponding to the bushing oil intake holes (6); the piston (1) is internally provided with oil output holes (8) corresponding to the connecting-rod oil intake holes (7); and the oil output holes (8) are in communication with an oil channel (9) in the piston (1). By means of providing the bushing oil intake holes (6), the connecting-rod oil intake holes (7) and the oil output holes (8), lubricating oil in the oil channel (9) in the piston (1) sequentially passes through the oil output holes (8), the connecting-rod oil intake holes (7) and the bushing oil intake holes (6) and then enters the inside of the bushing (3), such that the lubricating effect of the bushing (3) can be effectively improved..
[0010] Another patent application, "CN202402156U," titled "Engine steel piston with through oil hole," describes an engine steel piston with a through oil hole, which comprises a piston body, a combustion chamber, an inner cooling oil channel and an inner cavity, wherein an oil hole penetrates through an inner cavity from the inner cooling oil channel; the included angle alpha between a central line of the oil hole and the central line of a piston is equal to 30-50 degrees; the diameter phi D of the oil hole is equal to 2.5-5.5mm; and lubricating oil flows through the oil hole and the inner cavity of the piston from the inner cooling oil channel, and then reaches the upper surface of a connecting rod, and finally flows into the outer surface of a piston pin so as to improve the lubrication of the piston pin and the connecting rod and the lubrication of the piston pin and the piston. According to the engine steel piston, the forced lubrication between a steel piston pin hole and the steel piston is realized, the lubrication between the piston pin and the pin hole can be improved, and hazards of invalidity of the meshing of the piston pin and the pin hole and the like can be lowered effectively; and meanwhile, auxiliary effects generated by the utility model can perform forced lubrication between a small head hole of the connecting rod and the piston pin, and can replace the design that a long oil hole penetrates through a large head of the connecting rod and a small head of the connecting rod, and the processing cost and the manufacturing cost are lowered greatly.
[0011] In conventional heavy-duty internal combustion engines employing cast iron pistons, challenges related to insufficient lubrication of a piston pin and conrod bushing, as well as elevated engine oil consumption, are typically addressed through incremental changes to oil supply systems, ring pack configurations, or piston geometries. However, such conventional approaches exhibit several limitations in ensuring adequate oil delivery to a conrod small end while simultaneously preventing oil migration toward a combustion chamber. In particular, existing piston designs are ineffective in providing controlled drainage of lubricating oil from an oil scraper ring groove and in directing sufficient oil flow from a piston cooling gallery toward a piston pin and bushing region, leading to localized oil starvation, increased friction, and a higher risk of piston pin or conrod bushing seizure under high-load operating conditions. Additionally, accumulated oil within the oil scraper ring groove in conventional pistons may re-enter the combustion chamber during piston reciprocation, resulting in increased oil burning and elevated engine oil consumption. Attempts to mitigate these issues often require substantial redesign of piston assemblies or ancillary lubrication components, which may be identified only after durability failures, excessive oil consumption, or field reliability concerns arise during engine validation or operation. As a result, conventional piston design strategies increase development effort, validation time, and manufacturing complexity, while limiting durability, efficiency, and reliability of heavy-duty engine platforms.
OBJECTIVES OF THE INVENTION
[0012] The objective of the present invention is to provide a piston configuration for an internal combustion engine that is easily adaptable to existing engine platforms without requiring significant changes to engine architecture or assembly processes.
[0013] The objective of the present invention is to improve lubrication of a piston pin and a connecting rod bushing so as to prevent seizure of the piston pin and connecting rod bearing during engine operation.
[0014] The objective of the present invention is to reduce engine oil consumption by limiting migration of lubricating oil from an oil scraper ring groove toward a combustion bowl.
[0015] The objective of the present invention is to enhance controlled drainage of lubricating oil from an oil scraper ring groove toward an engine sump during piston reciprocation.
[0016] The objective of the present invention is to increase effective oil flow from a piston cooling region toward a small end of a connecting rod to ensure adequate lubrication under high-load operating conditions.
[0017] The objective of the present invention is to improve piston cooling efficiency so as to enhance durability and thermal stability of the piston during prolonged engine operation.
[0018] The objective of the present invention is to achieve the foregoing objectives without introducing complex piston geometries or additional lubrication components.
[0019] The objective of the present invention is to provide a robust and reliable piston solution that minimizes the risk of bearing failure while maintaining compatibility with existing ring pack configurations.
[0020] The objective of the present invention is to deliver a cost-effective, manufacturable, and easily implementable piston design that improves engine durability and reduces oil-related failures in heavy-duty internal combustion engines.
SUMMARY
[0021] The present invention relates to a piston for reducing engine oil consumption for an internal combustion engine.
[0022] According to an aspect, a piston for reducing engine oil consumption for an internal combustion engine is disclosed. The piston comprises a cylindrical piston body operatively coupled to a connecting arm and configured to reciprocate within a cylinder bore. The piston further comprises a piston crown defining a combustion bowl. The piston further comprises a ring belt portion comprising at least a compression ring groove and an oil scraper ring groove. The piston further comprises a plurality of oil drain holes formed in the oil scraper ring groove and extending through the cylindrical piston body. Further, the plurality of oil drain holes are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl. Further, the plurality of oil drain holes are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure. Further, the piston is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly.
[0023] According to another aspect, a method for providing a piston for reducing engine oil consumption for an internal combustion engine. The method comprises steps of coupling a cylindrical piston body operatively to a connecting arm and the cylindrical piston body being configured to reciprocate within a cylinder bore. The method further comprises steps of providing a piston crown defining a combustion bowl. The method further comprises steps of providing a ring belt portion comprising at least a compression ring groove and an oil scraper ring groove. The method further comprises steps of forming a plurality of oil drain holes in the oil scraper ring groove and the plurality of oil drain holes extends through the cylindrical piston body. Further, the plurality of oil drain holes are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl. Further, the plurality of oil drain holes are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure. Further, the piston is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The accompanying drawings illustrate various embodiments of systems, methods, and embodiments of various other aspects of the disclosure. Any person with ordinary skills in the art will appreciate that the illustrated element boundaries (e.g., boxes, groups of boxes, or other shapes) in the figures represent one example of the boundaries. It may be that in some examples one element may be designed as multiple elements or that multiple elements may be designed as one element. In some examples, an element shown as an internal component of one element may be implemented as an external component in another, and vice versa. Furthermore, elements may not be drawn to scale. Non-limiting and non-exhaustive descriptions are described with reference to the following drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating principles.
[0025] FIG. 1 illustrates a side view of a piston for reducing engine oil consumption for an internal combustion engine, according to an embodiment of the present disclosure; and
[0026] FIG. 2 illustrates a flowchart showing a method for providing a piston for reducing engine oil consumption for an internal combustion engine, according to an embodiment of the present disclosure.
DETAILED DESCRIPTION
[0027] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words “comprising,” “having,” “containing,” and “including,” and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise.
[0028] Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the preferred, systems and methods are now described. Embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings in which like numerals represent like elements throughout the several figures, and in which example embodiments are shown. Embodiments of the claims may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The examples set forth herein are non-limiting examples and are merely examples among other possible examples.
[0029] The present invention discloses various embodiments of a piston for reducing engine oil consumption for an internal combustion engine. Embodiments of the present invention comprises a cylindrical piston body operatively coupled to a connecting arm and configured to reciprocate within a cylinder bore. Embodiments of the present invention further comprises a piston crown defining a combustion bowl. Embodiments of the present invention further comprises a ring belt portion comprising at least a compression ring groove and an oil scraper ring groove. Embodiments of the present invention further comprises a plurality of oil drain holes formed in the oil scraper ring groove and extending through the cylindrical piston body. Further, the plurality of oil drain holes are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl. Further, the plurality of oil drain holes are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure. Further, the piston is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly.
[0030] FIG. 1 illustrates a side view of a piston (100) for reducing engine oil consumption for an internal combustion engine, according to an embodiment of the present disclosure.
[0031] In some embodiments, a piston (100) for reducing engine oil consumption for an internal combustion engine comprises a cylindrical piston body (102) operatively coupled to a connecting arm and configured to reciprocate within a cylinder bore. The piston (100) is adapted to cooperate with a cylinder head to define a combustion chamber during engine operation. The cylindrical piston body (102) supports axial and radial loads generated during combustion and reciprocating motion. The piston crown (104) forms an upper portion of the piston (100) exposed to combustion gases. The piston crown (104) defines a combustion bowl configured to receive and contain combustion energy. The disclosed piston configuration is particularly suitable for heavy-duty internal combustion engines operating under high load conditions.
[0032] In some embodiments, the piston (100) further comprises a ring belt portion (106) formed along an outer peripheral region of the cylindrical piston body (102). The ring belt portion (106) comprises at least a compression ring groove (108) and an oil scraper ring groove (110) arranged axially along the cylindrical piston body (102). The compression ring groove (108) is configured to receive a compression ring for sealing combustion gases within the combustion chamber. The oil scraper ring groove (110) is configured to receive an oil scraper ring for controlling lubricating oil on a cylinder liner. The ring belt portion (106) enables effective sealing, oil control, and heat transfer during engine operation. The configuration is compatible with conventional ring pack arrangements.
[0033] In some embodiments, a plurality of oil drain holes (112) are formed in the oil scraper ring groove (110) and extend through the cylindrical piston body (102). The plurality of oil drain holes (112) provide a drainage path for lubricating oil scraped from the cylinder liner by the oil scraper ring. During piston reciprocation, oil collected in the oil scraper ring groove (110) is directed through the plurality of oil drain holes (112). The plurality of oil drain holes (112) enable controlled evacuation of excess oil from the ring groove region. This configuration reduces the tendency of oil to migrate toward the combustion bowl. As a result, engine oil consumption is reduced during sustained engine operation.
[0034] In some embodiments, the plurality of oil drain holes (112) are configured to drain lubricating oil toward an engine sump. The oil scraped by the oil scraper ring is guided through the plurality of oil drain holes (112) and directed away from the piston crown (104) region. By reducing oil retention within the oil scraper ring groove (110), re-entry of oil into the combustion chamber during piston motion is minimized. This reduces oil burning during combustion. Lower oil burning contributes to reduced engine oil consumption and improved exhaust characteristics. The controlled drainage also stabilizes oil control performance across operating conditions.
[0035] In some embodiments, the plurality of oil drain holes (112) are further configured to increase lubricating oil flow toward a small end of the connecting rod. Oil drained through the cylindrical piston body (102) is directed toward a piston pin and bushing region. Increased oil flow improves lubrication of the piston pin assembly during high-load and high-temperature operation. Improved lubrication reduces friction and wear at the connecting rod small end. Adequate oil supply prevents seizure of the piston pin and bushing. This enhances engine reliability and durability.
[0036] In some embodiments, the plurality of oil drain holes (112) are circumferentially spaced around the oil scraper ring groove (110). Circumferential spacing ensures uniform drainage of lubricating oil from the oil scraper ring groove (110). Uniform oil drainage prevents localized oil accumulation within the groove. The circumferential arrangement maintains balanced oil flow around the cylindrical piston body (102). This configuration improves consistency of oil control during piston reciprocation. Even drainage supports stable lubrication behavior throughout engine operation.
[0037] In some embodiments, the plurality of oil drain holes (112) are formed on opposite sides of the cylindrical piston body (102). Placement on opposite sides enables balanced oil discharge paths within the piston structure. Balanced oil flow reduces asymmetric oil loading on the cylindrical piston body (102). The opposing arrangement assists in directing oil toward both sides of the piston pin region. This improves lubrication uniformity across the piston pin and bushing interface. The configuration contributes to reduced localized wear and improved durability.
[0038] In some embodiments, each oil drain hole has a diameter of about 4 millimeters. The increased diameter allows a higher volume of lubricating oil to pass through the plurality of oil drain holes (112). Improved oil flow capacity enhances drainage efficiency from the oil scraper ring groove (110). The larger diameter supports rapid evacuation of oil during high-speed piston motion. Enhanced oil flow improves lubrication delivery to the piston pin assembly. The diameter selection balances effective drainage with structural integrity of the cylindrical piston body (102).
[0039] In some embodiments, each oil drain hole is oriented at an angle of about 40 degrees relative to a longitudinal axis of the piston (100). The angular orientation facilitates directed oil flow toward the engine sump and the connecting rod small end. Angled holes improve the momentum of oil flow during piston reciprocation. This orientation enhances oil delivery efficiency compared to perpendicular drainage paths. The angular configuration assists in reducing oil splash toward the combustion bowl. As a result, oil control and lubrication performance are improved.
[0040] In some embodiments, the plurality of oil drain holes (112) fluidly communicates with an interior oil return passage of the piston (100). The oil return passage directs drained lubricating oil toward the engine sump. Fluid communication between the plurality of oil drain holes (112) and the oil return passage ensures controlled oil routing. This arrangement prevents random oil dispersion within the cylindrical piston body (102). Efficient oil return contributes to stable lubrication system performance. The configuration supports continuous oil circulation during engine operation.
[0041] In some embodiments, the plurality of oil drain holes (112) are configured to increase lubricating oil flow toward a piston pin bore region of the cylindrical piston body (102). The piston pin bore region receives oil discharged through the plurality of oil drain holes (112). Enhanced oil delivery improves hydrodynamic lubrication between the piston pin and bushing. Improved lubrication reduces metal-to-metal contact during reciprocating motion. This minimizes wear and reduces the risk of bearing seizure. The configuration improves long-term durability of the piston pin assembly.
[0042] In some embodiments, the plurality of oil drain holes (112) are arranged symmetrically with respect to a central axis of the piston (100). Symmetrical arrangement ensures balanced oil flow distribution within the cylindrical piston body (102). Balanced oil flow prevents uneven thermal and lubrication conditions. Symmetry contributes to uniform wear characteristics of the piston pin and bushing. The arrangement enhances mechanical stability during high-speed operation. Uniform oil distribution improves overall engine reliability.
[0043] In some embodiments, the plurality of oil drain holes (112) are configured to prevent accumulation of lubricating oil within the oil scraper ring groove (110) during engine operation. Continuous drainage avoids oil pooling in the ring groove region. Reduced oil accumulation limits oil migration toward the combustion bowl during piston motion. This minimizes oil burning during combustion cycles. Preventing oil accumulation improves oil control efficiency. The piston (100) thereby achieves reduced engine oil consumption and improved lubrication performance.
[0044] FIG. 2 illustrates a flowchart showing a method (200) for providing a piston (100) for reducing engine oil consumption for an internal combustion engine, according to an embodiment of the present disclosure.
[0045] At operation 202, the cylindrical piston body (102) is operatively coupled to the connecting arm and the cylindrical piston body (102) being configured to reciprocate within the cylinder bore. The piston (100) is adapted to cooperate with a cylinder head to define a combustion chamber during engine operation. The cylindrical piston body (102) supports axial and radial loads generated during combustion and reciprocating motion. The disclosed piston configuration is particularly suitable for heavy-duty internal combustion engines operating under high load conditions.
[0046] At operation 204, the piston crown (104) is provided defining a combustion bowl. The piston crown (104) forms an upper portion of the piston (100) exposed to combustion gases.
[0047] At operation 206, the ring belt portion (106) is provided comprising the at least a compression ring groove (108) and the oil scraper ring groove (110). The compression ring groove (108) is configured to receive a compression ring for sealing combustion gases within the combustion chamber.
[0048] At operation 208, the plurality of oil drain holes (112) is formed in the oil scraper ring groove (110) and the plurality of oil drain holes (112) extends through the cylindrical piston body (102). Further, the plurality of oil drain holes (112) are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl. Further, the plurality of oil drain holes (112) are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure. Further, the piston (100) is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly.
[0049] The plurality of oil drain holes (112) provide a drainage path for lubricating oil scraped from the cylinder liner by the oil scraper ring. During piston reciprocation, oil collected in the oil scraper ring groove (110) is directed through the plurality of oil drain holes (112). The plurality of oil drain holes (112) enable controlled evacuation of excess oil from the ring groove region. This configuration reduces the tendency of oil to migrate toward the combustion bowl. As a result, engine oil consumption is reduced during sustained engine operation.
[0050] In some embodiments, the plurality of oil drain holes (112) are configured to drain lubricating oil toward an engine sump. The oil scraped by the oil scraper ring is guided through the plurality of oil drain holes (112) and directed away from the piston crown (104) region. By reducing oil retention within the oil scraper ring groove (110), re-entry of oil into the combustion chamber during piston motion is minimized. This reduces oil burning during combustion. Lower oil burning contributes to reduced engine oil consumption and improved exhaust characteristics. The controlled drainage also stabilizes oil control performance across operating conditions.
[0051] In some embodiments, the plurality of oil drain holes (112) are further configured to increase lubricating oil flow toward a small end of the connecting rod. Oil drained through the cylindrical piston body (102) is directed toward a piston pin and bushing region. Increased oil flow improves lubrication of the piston pin assembly during high-load and high-temperature operation. Improved lubrication reduces friction and wear at the connecting rod small end. Adequate oil supply prevents seizure of the piston pin and bushing. This enhances engine reliability and durability.
[0052] In some embodiments, the plurality of oil drain holes (112) are circumferentially spaced around the oil scraper ring groove (110). Circumferential spacing ensures uniform drainage of lubricating oil from the oil scraper ring groove (110). Uniform oil drainage prevents localized oil accumulation within the groove. The circumferential arrangement maintains balanced oil flow around the cylindrical piston body (102). This configuration improves consistency of oil control during piston reciprocation. Even drainage supports stable lubrication behavior throughout engine operation.
[0053] In some embodiments, the plurality of oil drain holes (112) are formed on opposite sides of the cylindrical piston body (102). Placement on opposite sides enables balanced oil discharge paths within the piston structure. Balanced oil flow reduces asymmetric oil loading on the cylindrical piston body (102). The opposing arrangement assists in directing oil toward both sides of the piston pin region. This improves lubrication uniformity across the piston pin and bushing interface. The configuration contributes to reduced localized wear and improved durability.
[0054] In some embodiments, each oil drain hole has a diameter of about 4 millimeters. The increased diameter allows a higher volume of lubricating oil to pass through the plurality of oil drain holes (112). Improved oil flow capacity enhances drainage efficiency from the oil scraper ring groove (110). The larger diameter supports rapid evacuation of oil during high-speed piston motion. Enhanced oil flow improves lubrication delivery to the piston pin assembly. The diameter selection balances effective drainage with structural integrity of the cylindrical piston body (102).
[0055] In some embodiments, each oil drain hole is oriented at an angle of about 40 degrees relative to a longitudinal axis of the piston (100). The angular orientation facilitates directed oil flow toward the engine sump and the connecting rod small end. Angled holes improve the momentum of oil flow during piston reciprocation. This orientation enhances oil delivery efficiency compared to perpendicular drainage paths. The angular configuration assists in reducing oil splash toward the combustion bowl. As a result, oil control and lubrication performance are improved.
[0056] In some embodiments, the plurality of oil drain holes (112) fluidly communicates with an interior oil return passage of the piston (100). The oil return passage directs drained lubricating oil toward the engine sump. Fluid communication between the plurality of oil drain holes (112) and the oil return passage ensures controlled oil routing. This arrangement prevents random oil dispersion within the cylindrical piston body (102). Efficient oil return contributes to stable lubrication system performance. The configuration supports continuous oil circulation during engine operation.
[0057] In some embodiments, the plurality of oil drain holes (112) are configured to increase lubricating oil flow toward a piston pin bore region of the cylindrical piston body (102). The piston pin bore region receives oil discharged through the plurality of oil drain holes (112). Enhanced oil delivery improves hydrodynamic lubrication between the piston pin and bushing. Improved lubrication reduces metal-to-metal contact during reciprocating motion. This minimizes wear and reduces the risk of bearing seizure. The configuration improves long-term durability of the piston pin assembly.
[0058] In some embodiments, the plurality of oil drain holes (112) are arranged symmetrically with respect to a central axis of the piston (100). Symmetrical arrangement ensures balanced oil flow distribution within the cylindrical piston body (102). Balanced oil flow prevents uneven thermal and lubrication conditions. Symmetry contributes to uniform wear characteristics of the piston pin and bushing. The arrangement enhances mechanical stability during high-speed operation. Uniform oil distribution improves overall engine reliability.
[0059] In some embodiments, the plurality of oil drain holes (112) are configured to prevent accumulation of lubricating oil within the oil scraper ring groove (110) during engine operation. Continuous drainage avoids oil pooling in the ring groove region. Reduced oil accumulation limits oil migration toward the combustion bowl during piston motion. This minimizes oil burning during combustion cycles. Preventing oil accumulation improves oil control efficiency. The piston (100) thereby achieves reduced engine oil consumption and improved lubrication performance.
[0060]  Various embodiments of the present invention provide notable advantages through a piston (100) for reducing engine oil consumption in an internal combustion engine. The piston (100) provides an easily adaptable solution that can be implemented within existing engine platforms without requiring changes to a cylindrical piston body (102), a piston crown (104), or a ring belt portion (106) comprising a compression ring groove (108) and an oil scraper ring groove (110). The piston (100) improves lubricating oil flow from a piston cooling region through a plurality of oil drain holes (112) formed in the oil scraper ring groove (110) and extending through the cylindrical piston body (102) toward a small end of a connecting rod. Enhanced oil delivery improves lubrication of a piston pin and bushing, thereby reducing friction, wear, and the likelihood of bearing seizure during engine operation. Additionally, the plurality of oil drain holes (112) are configured to reduce lubricating oil flow toward a combustion bowl defined by the piston crown (104) by efficiently draining oil scraped from a cylinder liner toward an engine sump. Reduction of oil migration toward the combustion bowl minimizes oil burning during combustion and results in reduced engine oil consumption. Overall, the piston (100) delivers improved lubrication performance, reduced oil consumption, enhanced durability, and ease of integration, providing a reliable and cost-effective solution for internal combustion engine applications.
[0061] It has thus been seen the piston (100) for reducing engine oil consumption for an internal combustion engine, as described. The piston (100) in any case could undergo numerous modifications and variants, all of which are covered by the same innovative concept; moreover, all of the details can be replaced by technically equivalent elements. In practice, the components used, as well as the numbers, shapes, and sizes of the components can be whatever according to the technical requirements. The scope of protection of the invention is therefore defined by the attached claims.
We Claim:
1. A piston (100) for reducing engine oil consumption for an internal combustion engine, the piston (100) comprising:
a cylindrical piston body (102) operatively coupled to a connecting arm and configured to reciprocate within a cylinder bore;
a piston crown (104) defining a combustion bowl;
a ring belt portion (106) comprising at least a compression ring groove (108) and an oil scraper ring groove (110);
a plurality of oil drain holes (112) formed in the oil scraper ring groove (110) and extending through the cylindrical piston body (102),
wherein the plurality of oil drain holes (112) are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl,
wherein the plurality of oil drain holes (112) are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure,
wherein the piston (100) is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly.

2. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) are circumferentially spaced around the oil scraper ring groove (110).
3. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) are formed on opposite sides of the cylindrical piston body (102).
4. The piston (100) as claimed in claim 1, wherein each oil drain hole has a diameter of about 4 mm.
5. The piston (100) as claimed in claim 1, wherein each oil drain hole is oriented at an angle of about 40° relative to a longitudinal axis of the piston (100).
6. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) fluidly communicates with an interior oil return passage of the piston (100) to direct lubricating oil toward the engine sump.
7. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) are configured to increase lubricating oil flow toward a piston pin bore region of the cylindrical piston body (102).
8. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) are arranged symmetrically with respect to a central axis of the piston (100).
9. The piston (100) as claimed in claim 1, wherein the plurality of oil drain holes (112) are configured to prevent accumulation of lubricating oil within the oil scraper ring groove (110) during engine operation.
10. A method for providing a piston (100) for reducing engine oil consumption for an internal combustion engine, the method comprising:
coupling a cylindrical piston body (102) operatively to a connecting arm and the cylindrical piston body (102) being configured to reciprocate within a cylinder bore;
providing a piston crown (104) defining a combustion bowl;
providing a ring belt portion (106) comprising at least a compression ring groove (108) and an oil scraper ring groove (110);
forming a plurality of oil drain holes (112) in the oil scraper ring groove (110) and the plurality of oil drain holes (112) extends through the cylindrical piston body (102),
wherein the plurality of oil drain holes (112) are configured to drain lubricating oil scraped from a cylinder liner by an oil scraper ring toward an engine sump so as to reduce flow toward the combustion bowl,
wherein the plurality of oil drain holes (112) are further configured to increase lubricating oil flow toward a small end of the connecting rod to improve lubrication of a piston pin and bushing and prevent bearing seizure,
wherein the piston (100) is configured to reduce engine oil consumption and improve lubrication of a piston pin assembly.