Description:Field of Invention
[001] The invention relates to piston assembly utilised in internal combustion engines of commercial vehicles. It more particularly relates to pistons that have been provided with features to allow the circulation of lubricating fluids.
Background of the Invention
[002] Typical piston assemblies of internal combustion engines contain pistons that do not ordinarily contain any features to allow for their cooling using lubricating fluid that is being circulated to lubricate the pistons and other components of the internal combustion engine. Such pistons require a very efficient cooling system that may extract too much heat that may otherwise have been utilised to perform valuable work in the internal combustion engine.
[003] The need, therefore, is for a piston that allows most of the heat to remain in the combustion chamber while allowing both lubrication and cooling of the piston’s head so as not to let it get deformed by heat generated during a combustion cycle. Such a piston that may form a part of a piston assembly should also facilitate the lubrication of parts connected with it to reduce frictional losses in the engine. Therefore, it is an objective of this invention to provide a piston with improved cooling features that are capable of lubricating parts working in association with it.
[004] It is another objective of the present invention to provide a piston with improved cooling features that facilitates lubrication of parts working in conjunction with itself.
[005] It is still another objective of the present invention to provide a piston with improved cooling features that reduce the possibility of damage due to heat-associated deformation of the piston.
[006] It is yet another objective of the present invention to provide a piston with improved cooling features that do not extract too much heat from the engine, thereby allowing a lot more work to be done utilising the heat generated during the combustion of fuels.
Summary of the Invention
[007] An embodiment of the invention achieving the stated objective, that is a piston with improved cooling features (100), comprises of, circlips (5, 35), a piston pin (10), a piston (15), compression rings (20, 25), oil scrapper ring (30), circlips (5, 35), a conrod end bush (40), conrod end bearings (45, 50), a connecting rod (55), and screws (60). In the piston with improved cooling features (100), the piston (15) is provided with three grooves one above the other in a top portion of its cylindrical body that accommodate proceeding from top to bottom, compression rings (20, 25) and an oil scrapper ring (35); an opening given in the lower portion of the piston (15) accommodates a piston pin (10) that is held within said opening utilising circlips (5, 35) as provided on either end of said piston pin (10); an opening at the upper end of the connecting rod (55) accommodates the conrod end bush (40) via which said connecting rod (55) is linked with the piston pin (10); the upper end of the connecting rod (55) has an opening (55H) that leads to the opening accommodating said conrod end bush (40) so as to allow lubricating fluid to flow towards said conrod end bush (40); and an opening at the lower end of the connecting rod (55) accommodates conrod end bearings (45, 50); the lower end of the connecting rod (55) is made in two portions that are connected together using the screws (60).
Brief Description of Drawings
[008] The present invention is illustrated in the accompanying drawings that contain references numerals for indicating its various parts. The description of the present invention would therefore be better understood with reference to accompanying diagrams, wherein
[009] Figure 1 discloses the view of a wholly assembled piston assembly with a piston as per the preferred embodiment of the present invention.
[0010] Figure 2 discloses an exploded view of the piston assembly with the preferred embodiment of the present invention.
[0011] Figure 3 discloses a bottom view of the piston as per the preferred embodiment of the present invention.
[0012] Figure 4 discloses the vertical-cut-section view of the piston as per the preferred embodiment of the present invention.
[0013] Figure 5 discloses the horizontal-cut-section view of the piston as per the preferred embodiments of the present invention.
Detailed Description of the Invention
[0014] Referring to the set of figures 1, and 2, the piston with improved cooling features (100), comprises of, circlips (5, 35), a piston pin (10), a piston (15), compression rings (20, 25), oil scrapper ring (30), circlips (5, 35), a conrod end bush (40), conrod end bearings (45, 50), a connecting rod (55), and screws (60). The piston with improved cooling features (100) has construction and assembly as shown in the diagrams and as described hereinafter.
[0015] Referring to Figures 1 and 2, it is stated that the piston (15) is provided with three grooves, one above the other, in the top portion of its cylindrical body that accommodate proceeding from top to bottom, compression rings (20, 25) and an oil scrapper ring (35). An opening given in the lower portion of the piston (15) accommodates a piston pin (10) that is held within said opening utilising circlips (5, 35) as provided on either end of said piston pin (10). The compression rings (20, 25) work to prevent blow-by of combustion gases when this piston assembly is utilised in a working internal combustion engine. The oil scrapper ring (35) leaves enough lubricating oil between the engine liner and the piston (15) to prevent them from coming into direct contact while limiting the amount of lubricating oil consumed while the internal combustion engine works.
[0016] Referring to figures 1 and 2, it is stated that an opening at the upper end of the connecting rod (55) accommodates the conrod end bush (40), via which said connecting rod (55) is linked with the piston pin (10). The upper end of the connecting rod (55) has an opening (55H) that leads to the opening accommodating said conrod end bush (40) so as to allow lubricating fluid to flow towards said conrod end bush (40). An opening at the lower end of the connecting rod (55) accommodates conrod end bearings (45, 50). The lower end of the connecting rod (55) is made in two portions that are connected together using the screws (60). This opening (55H) allows lubricating oil to flow towards the conrod end bush (40) from the piston (15). The connecting rod. The bushes (40, 45, 50) reduce friction between the parts accepting engine output from the piston (15) and transmitting it to the crankshaft via the connecting rod (55).
[0017] Referring to Figures 3, 4 and 5, it is stated that the piston (15) is provided with an annular chamber (15AC) in the top portion of the piston that has a cross-section roughly resembling a trapezoid that has been provided with a curved upper and lower side. The annular chamber (15AC) is provided with openings (15H1, and 15H2) that are separated from each other by an angle of 180 degrees, with said opening (15H1) being larger than the opening (15H2). This particular feature provided with the given angular separation allows the oil sprayed at the piston from below to enter via openings (15H1), then lubricate and cool the volume surrounding the annular chamber (15AC) and then leave from the said chamber via the given openings (15H2, 15H3). The arrow given in the figure 5 indicate the typical direction of flow of lubricating oil once it has entered the annular chamber (15AC) via the opening (15H1).
[0018] Referring to Figures 3, 4 and 5, it is stated the annular chamber (15AC) is provided with another opening (15H3) that is located between the openings (15H1, 15H2) along the circular periphery of the annular chamber (15AC) on the piston (15) and that is smaller than either of the openings (15H1, 15H2). The opening (15H3) as provided on the annular chamber (15AC) in the piston (15) is configured to align with the opening (55H) given on the upper portion of the connecting rod (55) when the piston (15) reciprocates within the chamber of the internal combustion engine. The alignment of the opening (15H3) with the opening (55H) allows the lubricating oil to flow out of the piston (15) to facilitate lubrication of the con rod bush (40) through the connecting rod (55). This reduces the friction being experienced by the part.
[0019] The piston with improved cooling features (100) so disclosed can be utilised in internal combustion engines utilising primarily diesel combustion cycles. But it may be easily modified to allow it to be utilised for engines using other cycles as well.
[0020] Technical advantages offered by the invention i.e., a piston with improved cooling features (100) are-
- It is capable of lubricating parts working in association with it.
- It facilitates lubrication of parts working in conjunction with itself.
- It reduces the possibility of damage due to heat-associated deformation of the piston.
- It does not extract too much heat from the engine, thereby allowing a lot more work to be done utilising the heat generated during the combustion of fuels.
[0021] The disclosed invention i.e. the piston with improved cooling features (100) achieves all the set-out objectives.
[0022] It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the present invention has been herein described in terms of its preferred embodiment, those skilled in the art will recognize that the preferred embodiment herein disclosed, can be practiced with modifications within the scope of the invention herein described.
, Claims:We Claim,
1. A piston with improved cooling features (100), where the piston assembly comprises of,
• circlips (5, 35),
• a piston pin (10),
• a piston (15),
• compression rings (20, 25),
• oil scrapper ring (30),
• circlips (5, 35),
• a conrod end bush (40),
• conrod end bearings (45, 50),
• a connecting rod (55),
• screws (60),
wherein,
- the piston (15) is provided with three grooves one above the other in a top portion of its cylindrical body that accommodate proceeding from top to bottom, compression rings (20, 25) and an oil scrapper ring (35);
- an opening given in the lower portion of the piston (15) accommodates a piston pin (10) that is held within said opening utilising circlips (5, 35) as provided on either end of said piston pin (10);
- an opening at the upper end of the connecting rod (55) accommodates the conrod end bush (40) via which said connecting rod (55) is linked with the piston pin (10); the upper end of the connecting rod (55) has an opening (55H) that leads to the opening accommodating said conrod end bush (40) so as to allow lubricating fluid to flow towards said conrod end bush (40); and
- an opening at the lower end of the connecting rod (55) accommodates conrod end bearings (45, 50); the lower end of the connecting rod (55) is made in two portions that are connected together using the screws (60).
2. The piston with improved cooling features (100), as claimed in claim 1, wherein the piston (15) is provided with an annular chamber (15AC) in the top portion of the piston that has a cross-section roughly resembling a trapezoid that has been provided with curved upper and lower side.
3. The piston with improved cooling features (100) as claimed in claim 2, wherein, the annular chamber (15AC) is provided with openings (15H1, and 15H2) that are separated from each other by an angle of 180 degrees, with said opening (15H1) being larger than the opening (15H2).
4. The piston with improved cooling features (100) as claimed in claim 3, wherein, the annular chamber (15AC) is provided with another opening (15H3) that is located between the openings (15H1, 15H2) along the circular periphery of the annular chamber (15AC) on the piston (15) and that is smaller than either of the openings (15H1, 15H2).
5. The piston with improved cooling features (100) as claimed in claim 4, wherein the opening (15H3) as provided on the annular chamber (15AC) in the piston (15) is configured to align with the openings (55H) given on the upper portion of the connecting rod (55) when the piston (15) reciprocates within the chamber of the internal combustion engine.

Dated 25th day of February 2025

VIDIT CHOUBEY
(IN P/A 5566)
AGENT FOR THE APPLICANT(S)

To,
The Controller of Patents,
The Patent Office, at Mumbai