DESC:TECHNICAL FIELD
Present disclosure generally relates to the field of Automobiles. Particularly, but not exclusively, the present disclosure relates to a lubrication system of an engine in a vehicle. Further, embodiments of the present disclosure disclose a system for lubricating gears in the engine.

BACKGROUND
Conventionally, Internal Combustion (I.C) engines are provided with one or more inlet valves for delivering fuel or air-fuel mixture into the combustion chamber, and one or more exhaust valves for expelling exhaust gases out of the combustion chamber. The inlet and exhaust valves are operated by valve actuating (opening and closing) mechanisms which ensure proper timing of actuations of both the valves. One of the most commonly employed mechanisms for actuating valves of an engine is cam-rocker arm assembly. In such a mechanism, a camshaft comprising one or more cams may be rotated with a predetermined angular speed. The rotational movement of the cams may cause linear actuation of one or more intermediate linkages, which in turn cause rocking (pivotal) movement of the rocker arm. The rocker arm may be configured to push valve stems inside, resulting in opening of the valves for induction of fuel or air-fuel mixture or expelling the exhaust gases. When the rocker arm pivotally moves in opposite direction, the valve retracts and comes to closed condition to suppress flow of fuel or air-fuel mixture into the combustion chamber, or flow of exhaust gases from the combustion chamber of the engine.

Generally, the inlet and exhaust valves are actuated by cams mounted on separate camshafts. In most of the conventionally available vehicles, the camshafts are imparted with torque (or power) from rotating crankshaft through various drives, including but not limited to chain drives, gear drives and belt drives. Use of chain drives is limited owing to the difficulties in periodic maintenance, periodic slackness adjustment, less durability and comparatively higher manufacturing costs. Similarly, belt drives may have some limitations like less transmission efficiency, slip, and progressive deformation which may lead to untimely failure of belts upon usage. Considering the above, the vehicle manufactures use gear drives for transmitting power between various shafts, including but not limited to inlet and exhaust camshafts in the engine. The gear drives have advantages such as minimal or zero-slip, higher torque bearing and transmission capacity, better transmission efficiency with minimal losses, and ease of maintenance in comparison with belt drive and chain drive counterparts. However, there may be few limitations associated with gear drives such as but not limited to interference and backlash. These problems are inherent and unavoidable in all gear drives, and may add to noise, vibrations and harshness (NVH) characteristics of the engine. Noise and vibration control is one of the important factors to be considered by designers and manufacturers of transmission systems, and more particularly the transmission systems involving gear drives and gear trains. The vibrations generated by transmission drives emanate noise which causes discomfort to passengers and driver. Also, if amplitudes of vibrations increase beyond permissible magnitudes, they are transmitted to engine and vehicle structure, which is undesirable.

The vibrations, and resulting noise emanating from gear drives are due to metal to metal contact, misalignment between mating teeth of meshing gears, and may get transmitted to transmission system of the vehicle via transmission housing. The extent of noise and vibration also increases with increase in unbalanced and unsteady forces, error in tooth spacing and misalignment of shafts on which the meshing gear drives are mounted. These errors or modifications in gear drives may occur during manufacturing of gear drives and the shafts, or during assembly of these drives with their respective shafts. With the ongoing developments, considerable efforts have been made to minimize vibrations and noise emanating from gear drives. One such method involves determining various types of loads acting on each tooth of the gear and providing tip relief to each tooth to minimize the unsteady and unbalanced forces. Another technique which is well known in the art is “crowning” of gear teeth where errors in power transmission in the gear drives due to misalignment between shafts are reduced. However, these modifications in gear teeth i.e. providing “tip relief” and “crowning” to gear teeth result in moderate reduction in vibrations, and may not be completely eliminated.

The present disclosure is directed to address one or more problems as discussed above.

The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the invention, and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

SUMMARY
The one or more drawbacks associated with the gear drives in an engine as described in the background are overcome and additional advantages are provided through the system as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be a part of the claimed disclosure.

In one non-limiting embodiment of the present disclosure, there is provided a system for lubricating gears in an engine. The system comprising an oil passage configured to channelize oil from an oil sump to the engine. Further, the system comprises at least one flow element configured in predetermined location of the oil passage, the at least one flow element is adapted to discharge oil flowing through the oil passage onto teeth of the gears.

In an embodiment of the present disclosure, the oil passage is fluidly connected to an oil pump for receiving pressurised oil.

In an embodiment of the present disclosure, the at least one flow element is at least one of nozzles, jet impingers and injectors. The at least one flow element comprises at least one orifice for discharging the oil.

In an embodiment of the present disclosure, the at least one flow element is oriented such that the oil is discharged onto meshing interface of the gears. The orientation of the at least one flow element is at least one of horizontal, vertical and inclined to axes of the gears.

In an embodiment of the present disclosure, the at least one flow element discharges lubricating oil on meshing interface of at least one of camshaft gears or balancer shaft gears in the engine.

In an embodiment of the present disclosure, the system comprises an oil collection provision in the engine, the oil collection provision is configured to accumulate the oil trickling from the teeth of the gears. The oil collection provision is fluidly connected to the oil sump to route the accumulated oil to the oil sump.

It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.

The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
The novel features and characteristics of the disclosure are set forth in the appended description. The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:

FIG. 1 illustrates sectional perspective view of an exemplary engine of the vehicle having a system for lubricating gears in the engine, according to an embodiment of the present disclosure.

FIG. 2 illustrates sectional perspective view of a portion of the engine of FIG. 1 comprising a system for lubricating gears, according to an exemplary embodiment of the present disclosure.

FIG. 3 illustrates sectional front view of the engine of FIG. 2 with a flow element oriented towards the gears, according to an exemplary embodiment of the present disclosure.

FIG. 4A illustrates sectional side view of the engine of FIG. 2 showing the gears and the flow element.

FIG. 4B illustrates a perspective view of flow element used in the system for lubricating gears in the engine, according to an exemplary embodiment of the present disclosure.

The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the systems and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.

Embodiments of the present disclosure relates to a system for lubricating gears in engines. In an engine, gear drives such as but not limited to inlet and exhaust valve camshaft gears and balancer shaft gears are provided to drive the respective shafts during rotation of the crankshaft. The system comprises at least one flow element which is positioned such that it receives lubricating oil from one or more oil flow passages of lubricating system of the engine. The oil flowing through one or more oil flow passages of the engine will be pressurized by circulation pump, so that proper flow rate of oil may be maintained throughout the engine. The pressurized oil enters into the flow element, and the flow element discharges the pressurized oil onto mating teeth of meshing gears. In an embodiment of the disclosure, the flow element may be selected from one of jet impingers, nozzles and injectors, so that the lubricating oil is impinged, sprayed or injected depending on requirement. The flow element may consist of a narrow opening or an orifice for discharging the oil onto gear teeth. In an embodiment of the disclosure, the flow element may be oriented in the engine such that its longitudinal axis is parallel or perpendicular or inclined with respect to axes of gear drives. The oil discharged by flow element onto mating surfaces of gear drives helps in lubricating mating teeth of the gears provided on camshafts and balancer shafts, thereby reducing friction between them. A reduction in friction between mating teeth denotes reduction in noise and vibration emanating from the meshing gear drives. This in turn denotes smooth and efficient transmission of power between the shafts on which the gear drives are mounted. In an embodiment of the present disclosure, the system comprises an oil collection provision in the engine, the oil collection provision is configured to accumulate the oil trickling from the teeth of the gears. The oil collection provision is fluidly connected to the oil sump to route the accumulated oil to the oil sump.

Use of terms such as “comprises”, “comprising”, or any other variations thereof in the description, are intended to cover a non-exclusive inclusion, such that a system, device or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or method. In other words, one or more elements in a mechanism proceeded by “comprising… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or the mechanism.

Also, in foregoing description, words such as upper, lower, above, below are used with respect to particular orientation of the system, device or assembly, and components that constitute the system or the assembly, as shown in figures of the present disclosure. However, one should note that such terms are not limiting scope of the present disclosure, as implications of such prepositions change with the change in orientation and direction of view of figures.

Reference will now be made to a system for lubricating gears in an internal combustion engine, and is explained with the help of figures. The figures are for the purpose of illustration only and should not be construed as limitations on the system. Wherever possible, referral numerals will be used to refer to the same or like parts.

FIG. 1 is an exemplary embodiment of the disclosure which illustrates a sectional perspective view of an internal combustion engine (100) having a system (150) for lubricating gears (101, 102). Internal Combustion engines (hereafter referred to as engines), like four-stroke engines comprise inlet valves (60B) for admitting fuel or air-fuel mixture into combustion chamber, and exhaust valves (60A) for expelling burnt gases out of the combustion chamber. As known in the art, the exhaust and inlet valves (60A, 60B) [hereafter collectively referred to as valves (60) throughout the description] are actuated by a mechanism comprising camshaft (50), cam (55), follower (or push rod), rocker arm or roller finger follower (65) and valve stem (60C) of the valves (60). The stem (60C) of the valve (60) makes contact intermittently with the rocker arm or roller finger follower (65), and depending on the position of rocker arm or roller finger follower (65), the valves (60) are either opened or closed. The timing of valve (50) opening and closing depends on position of the cam (55) during rotation of camshaft (50). Generally, the camshaft (50) of the engine (100) is operated by the engine crankshaft [not shown], so that there is proper synchronization between intake stroke - compression stroke - power stroke - exhaust stroke to complete the operating cycle. The camshaft (50) may be provided anywhere in the engine (100). In an embodiment of the present disclosure, the camshaft (50) is an overhead type wherein the camshaft (50) lies above the valves (60). Further, the camshafts (50) corresponding to inlet and exhaust valves (60) are driven through various mechanisms including but not limited to chain drives and gear drives. One of the factors that determines the type of drive used may be the distance between camshaft and crankshaft inside the engine (100). For example, chain drives are preferred when distance between camshafts and the crankshaft is considerably more, and gear drives are preferred when distance between the shafts is less. However, in most of the cases, gear drives are preferred over other drives owing to their smooth and efficient transmission characteristics.

As it can be seen in FIG. 1, the camshafts (50) corresponding to inlet and exhaust valves (60) are coupled by gear drives (101, 102). Since gears (101, 102) of camshafts (50) mesh externally, the camshafts (50) corresponding to inlet and exhaust valves (60) rotate in opposite directions. Also, the cams mounted on inlet valve camshaft will be out of phase from the cams mounted on exhaust valve camshaft. This out of phase positioning of inlet and exhaust valve cams is intended for different opening timings of inlet and exhaust valves, and is not explained in detail in the detailed description part of present disclosure.

The engine (100) is also provided with coolant flow lines and lubricating oil flow lines. The lubricating oil lines may extend throughout the engine (100) and carry oil for lubricating moving components inside the engine (100) including but not limited to shaft bearings, valve bearings, cam surfaces, and the like. In an embodiment of the present disclosure, the camshafts (50) are supported by journal and thrust bearings inside the engine (100). The lubricating oil lines may extend through these bearings so that bearing surfaces are maintained with oil film for providing anti-frictional characteristics. Providing a lubrication system inside an engine (100) is well known in the art, and comprises an oil sump or a tank [not shown] which stores required quantity of lubricating oil. The oil stored in the oil sump may be circulated with predefined flow rate and pressure for lubricating the components inside the engine (100), facilitated by circulation pump [not shown]. The lubricating oil reduces friction between mating parts during movement and ensures smooth rolling or sliding movement between contact surfaces. For example, when lubricating oil is circulated through rolling pairs, a smooth rolling motion may be ensured. At the same time, the lubricating oil serves as a coolant to remove heat from parts and components which generate heat due to contacts, including but not limited to friction.

Now, referring to FIG. 2 in conjunction with FIG. 1, the lubrication system (150) for lubricating gears (101, 102) in the engine (100) is illustrated. As shown in FIG. 2, the shaft (50) is mounted with a gear (102) by mounting arrangements including but not limited to keys [not shown] provided in keyways (K). The keys arrest relative rotational motion between the shaft (50) and the gear (102) and ensure rotation of shaft (50) and the gear (102) in unison. The type of gear drive depends on parameters including but not limited to relative positions of driving and driven gear, amount of power to be transmitted, distance between shaft centres, and the like. For example, if power is to be transmitted between two shafts having axes parallel to each other, then spur gears or helical gears are preferred. If power is to be transmitted between shafts whose axes are perpendicular, then bevel gears are preferred. The use of gear drive of any known configuration may have some common problems such as friction, noise and vibration. Reducing the friction, and consequently, the noise and vibration not only improves efficiency of transmission, but also increases durability of the gear drives and related components. The system (150) disclosed in embodiments of the present disclosure aims at minimizing NVH characteristics of these gear drives by lubricating the gears during operation.

As mentioned in previous paragraphs, the gear drives (101, 102) are used to transmit power between several shafts like between crankshafts and camshafts, between camshafts, between crankshaft and balancer shafts, and so on. The need is to minimize noise and vibrations emanating from gear drives to best possible extent. Accordingly, the lubricating system (150) of the present disclosure discloses use of lubricating oil to reduce friction, and therefore, the noise and vibrations originating from gear drives (101, 102). The system (150) comprises one or more oil passages [not shown] extending from main oil flow line of the engine (100) through various components, mechanisms, sub-assemblies and the elements present in the engine (100). The oil passage carries lubricating oil so as to ensure proper lubrication of moving components which are in contact with one another. The oil flow passage channelizes oil flow from an oil circulation pump [not shown] through the flow lines present in the engine (100) for lubrication. The system (150) further comprises at least one flow element (20) configured at predetermined location in the oil flow passage. The flow element (20) is fluidly connected to the oil flow passage via an intermediate oil gallery (10). The fluid communication between oil passage and the flow element (20) allows pressurized oil to enter the oil gallery (10), and then into flow element (20). The flow element (20) is configured to discharge the pressurized lubricating oil onto the teeth (104) of gear drives (101, 102). The discharge of oil on teeth (104) of gears (101, 102) allows deposition of film of lubricating oil, and aids in smooth sliding movement of mating teeth (105) during meshing engagement of the gears (101, 102). The presence of lubricant film between mating teeth of gear drives (101, 102) also reduces tooth load, thereby increasing fatigue life of the gear teeth (104). A smooth sliding movement of mating teeth (105) denotes reduction in friction between the mating teeth, making the transmission smooth, noise free and efficient.

In an embodiment of the present disclosure, the flow element (20) may include but not limited to a nozzle, a jet impinger and an injector. In an exemplary embodiment of the disclosure a nozzle [shown in FIG. 4B] is used as flow element (20) in the lubrication system (150). A nozzle is a fluid flow element used to alter pressure, velocity and flow rate characteristics of a flowing fluid. The nozzle comprises a narrow opening which converges and/or diverges, so that the pressure and flow rate of fluid passing though it is altered. Also, the jet impinger and injector are more or less similar to a nozzle, except for that they operate under an external pressure source, like a plunger. In an alternate embodiment of the present disclosure, the flow element (20) is at least one of a sprayer and an atomizer where fluid is divided into fine droplets and sprayed over teeth (104) of meshing gears (101, 102).

FIG. 3 is an exemplary embodiment of the present disclosure which illustrates a sectional front view of a portion of an engine (100) shown in FIG. 1, with the system (150) for lubricating gear drives configured proximal to the mating gears (101, 102). The flow element (20), as explained in previous paragraphs, is configured to discharge lubricating oil onto mating surfaces of gear teeth (104) for reducing friction. The flow element (20) may be positioned proximal to the meshing gear drives (101, 102) in a predetermined orientation inside the engine (100). In an embodiment of the present disclosure, the flow element (20) is configured to be in fluid communication with the at least one oil passage in the engine (100). By this configuration, the oil flowing through the lubrication passages under pressure inside the engine (100) will flow into the oil gallery (10) of the flow element (20). Thereafter, the oil is guided through an opening or orifice (25) configured in the flow element (20) to discharge it onto meshing interface (105) of mating gear teeth (104). In an embodiment of the disclosure, the flow element (20) forms an integral fluidic element of the engine lubrication system, with flow element (20) being disposed proximal to the gears (101, 102). In an alternate embodiment, the flow element (20) may be fixed as an external component inside the engine (100) and proximal to gears (101, 102) by temporary joining techniques including but not limited to fastening, snap fit, press fit, and flaring, or by permanent joining processes including but not limiting to welding and brazing. In an alternative embodiment, the flow element (20) can be formed as an integral component of the engine (100) during casting process.

Reference is now made to FIGS. 4A and 4B which illustrate side perspective view of a portion of the engine (100) shown in FIG. 1 and magnified view of the flow element (20) respectively. Referring to FIG. 4A in conjunction with FIG. 3, the inlet side of the flow element (20) is fluidly connected to the oil gallery (10) such that the oil under pressure enters into the narrow opening or orifice (25) present in the flow element (20). The oil flows through the narrow opening or orifice (25) and is discharged onto the mating teeth of gear drives (101, 102) [as shown in FIG. 4A]. In an embodiment of the present disclosure, the flow element (20) discharges lubricating oil at meshing interface (105) of gear drives (101, 102), i.e. the flow element (20) sprays or impinges or injects lubricating oil on contacting points of gear teeth (104). This facilitates lubrication of the meshing gears (101, 102) such as camshaft gears and balancer shaft gears in the engine (100) of the vehicle, thereby improving NVH characteristics of the vehicle.

Further, the orientation and positioning of the at least one flow element (20) inside the engine (100) may depend on various parameters, including but not limited space availability and position of camshafts (50) of inlet and exhaust valves (60). In one embodiment of the present disclosure, the at least one flow element (20) may be held horizontally i.e. at zero degrees with respect to axes of meshing gears (101, 102), so that the longitudinal axis of the flow element (20) will be parallel to the axes (A-A) of gears (101, 102). In another embodiment, the flow element (20) may be positioned vertically (above or below) with respect to axes (A-A) of gears (101, 102), so that the longitudinal axis of the flow element (20) is perpendicular to the axes (A-A) of meshing gears (101, 102). In this orientation, the flow element (20) will be present directly above and below in the same plane as that of meshing teeth (105) of gears (101, 102). Therefore, the flow element (20) discharges lubricating oil directly onto the flank and face of gear teeth (104). In one embodiment, if the flow element (20) is positioned vertically above the axes of meshing gears (101, 102), the discharge of lubricating oil onto mating teeth of gears (101, 102) takes place under gravity. In still another embodiment, the flow element (20) is disposed substantially horizontal or substantially vertical with respect to axes (A-A) of the meshing gears (101, 102). In an alternate embodiment of the present disclosure, the flow element (20) is inclined to axes (A-A) of meshing gears (101, 102) [as shown in FIG. 3] such that the lubricating oil coming out of the flow element (20) strikes mating teeth of meshing gears (101, 102) at an angle. In an embodiment, the angle of inclination of flow element (20) with respect to axes (A-A) of gear drives (101, 102) vary between 10 degrees and 80 degrees. In an embodiment, the flow element (20) is disposed at 45 degrees with respect to axes (A-A) of the gear drives (101, 102). As shown in FIG. 4B, the pressurised oil entering the flow element (20) via the oil gallery (10) flows through the orifice (25), which thereafter gets discharged over the meshing interface (105) of the gear teeth (101, 102). In an embodiment of the present disclosure, the system (150) comprises an oil collection provision (110) in the engine (100), the oil collection provision (110) is configured to accumulate the oil trickling from the teeth (104) of the gears (101, 102). The oil collection provision (110) is fluidly connected to the oil sump to route the accumulated oil to the oil sump.

The above described orientations of flow element (20) with respect to axes of gears (101, 102) are not to be considered as the only possible orientations of flow element (20) inside the engine (100), and do not in any way limit the scope of present disclosure.

In the figures of the present disclosure, a system for lubrication of gears which transmit power between camshafts is shown. However, such exemplary embodiment should not be considered as limitation to the disclosure, as the system can be adapted to lubricate gears used for driving other shafts such as but not limiting to balancer shafts. Further, the exemplary embodiments shown in figures illustrate the system with one flow element, however one can provide more than one or plurality of flow elements in the oil passages of the engine for lubricating meshing gears.

It is to be understood that a person of ordinary skill in the art would develop a system of any configuration without deviating from the scope of the present disclosure. Further, various modifications and variations may be made without departing from the scope of the present invention. Therefore, it is intended that the present disclosure covers such modifications and variations provided they come within the ambit of the appended claims and their equivalents.

Advantages:
The present disclosure provides a system for lubricating gears in an engine in which the flow element present in the system discharges lubricating oil directly onto the mating teeth of gear drives. The presence of thin lubricant film between mating teeth allows smooth sliding contact between mating teeth i.e. with reduced friction, which in turn helps in noiseless transmission of power from one shaft to other shaft. This improves NVH characteristics of the engine and in turn, of the vehicle.

The present disclosure provides a system for lubricating gears in an engine in which the flow elements utilize the oil which is already flowing through the oil flow passages inside the engine. This eliminates the need for an auxiliary oil storage tank and circulation pump, making the system retro-fittable.

The present disclosure provides a system for lubricating gears in an engine, where the flow element can be positioned and fixed in preferred orientation inside the engine. This provides flexibility and allows the flow element to be positioned and oriented at different locations depending on the presence of camshafts and balancer shafts inside the engine. This makes the assembly simple and easily accessible for service and maintenance.

Equivalents
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.

It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or "an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."

While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

TABLE OF REFERRAL NUMERALS

Referral Numerals Description
100 Engine
10 Oil gallery
20 Flow element
24 Slot in the flow element
25 Orifice
50 Camshafts
55 Cams mounted on camshafts
60 Valves
60A, 60B Exhaust valves, Inlet valves
60C Valve stem
65 Rocker arm/ roller finger follower
101, 102 Gears
104 Teeth of gears
105 Meshing interface of teeth
110 Oil collection provision
A-A Axes of gears
K Keyway in the gears

,CLAIMS:We claim:

1. A system (150) for lubricating gears (101, 102) in an engine (100), the system (150) comprising:
an oil passage configured to channelize oil from an oil sump to the engine (100); and
at least one flow element (20) configured in predetermined location of the oil passage, wherein, the at least one flow element (20) is adapted to discharge oil flowing through the oil passage onto teeth (104) of the gears (101, 102).

2. The system (150) as claimed in claim 1, wherein the oil passage is fluidly connected to an oil pump for receiving pressurised oil.

3. The system (150) as claimed in claim 1, wherein the at least one flow element (20) is at least one of nozzles, jet impingers and injectors.

4. The system (150) as claimed in claim 1, wherein the at least one flow element (20) comprises at least one orifice (25) for discharging the oil.

5. The system (150) as claimed in claim 1, wherein the at least one flow element (20) is oriented towards the gears (101, 102) such that the oil is discharged onto meshing interface (105) of the gears (101, 102).

6. The system (150) as claimed in claim 5, wherein the orientation of the at least one flow element (20) is at least one of horizontal, vertical and inclined to axes (A-A) of the gears (101, 102).

7. The system (150) as claimed in claim 5, wherein the at least one flow element (20) discharges the oil on meshing interface (105) of at least one of camshaft gears and balancer shaft gears in the engine (100).

8. The system as claimed in claim 1 comprises an oil collection provision (110) in the engine (100), the oil collection provision (110) is configured to accumulate the oil trickling from the teeth (104) of the gears (101, 102).

9. The system as claimed in claim 8, wherein the oil collection provision (110) is fluidly connected to the oil sump to route the accumulated oil to the oil sump.

10. An internal combustion engine (100) of a vehicle comprising the system (150) as claimed in claim 1.