TECHNICAL FIELD
[0001] The present subject matter relates generally to an internal combustion engine of a two-wheeled vehicle, and more particularly to a lubrication System of an oil sealing assembly for the internal combustion engine of the two-wheeled vehicle.
BACKGROUND
[0002] Generally, in a two wheeled vehicle such as a scooter, a swinging internal combustion (IC) engine is located below the seat at a lower rear portion of the vehicle. The internal combustion (IC) engine is swingably supported by rear Suspension System and attached to the frame of the two wheeled vehicle and other end of the internal combustion (IC) engine is connected to a rear wheel of the two wheeled vehicle. A continuously variable transmission (CVT) System forms a part of the internal combustion (IC) engine and is disposed on the rear portion of the internal combustion (IC) engine and mounted so as to be disposed on right or left of the two wheeled vehicle.
[0003] The internal combustion engine converts thermal energy obtained from buming of a fuel with an oxidizer (air) into mechanical energy, which can be used to do some kind of mechanical work. It is used in a wide ränge of applications including providing motive force for movement of a vehicle. The main parts of the internal combustion engine include a cylinder head, a reciprocating piston on a cylinder block, a connecting rod which connects the reciprocating piston to the rotating crankshaft and, a stationary crankcase. During running of the vehicle lot of heat is generated inside the internal combustion (IC) engine. For reducing the impact of the heat on the piston, cylinder block and other engine parts oil sump is provided in the crankcase to störe oil and collects the falling oil during normal Operation to be cycled again. To retain that oil during normal Operation within the internal combustion (IC) engine a cover member is provided comprising an oil seal housing to which an oil sealing assembly is attached.

BRIEF DESCRIPTION OF THE DRAWINGS [0004] The detailed description is described with reference to the accompanying figures. The same numbers are used throughout the drawings to reference like features and components.
[0005] Fig. 1 illustrates a left side view of a two-wheeled vehicle, in accordance with an embodiment of the present subject matter.
[0006] Fig. 2 illustrates a left side view of the rear portion of the two wheeled vehicle illustrating a swingable internal combustion (IC) engine in accordance with the embodiment of the present subject matter.
[0007] Fig. 3 illustrates an exploded view of an assembly of a crankshaft over a cover member with an oil sealing assembly in accordance with an embodiment of the present subject matter.
[0008] Fig. 4 illustrates a detailed cross-sectional view of a crankcase LH assembly taken along PQ axis as shown in Fig. 3 in accordance with an embodiment of the present subject matter.
[0009] Fig. 5 illustrates a front cross-sectional view of an oil sealing assembly assembled over the oil seal housing in the cover member in accordance with an embodiment of the present subject matter
[00010] Fig. 6 illustrates a path of lubricant oil flow in accordance with an embodiment of the present subject matter.
DETAILED DESCRIPTION
[00011] Various features and embodiments of the present invention here will be discernible from the following further description thereof, set out hereunder. According to an embodiment, an internal combustion (IC) engine described here operates in four cycles. The IC engine is installed in a step through type two wheeled vehicle colloquially called as scooter. It is pertinent to note that the internal

combustion (IC) engine may be mounted in two wheeled vehicles in different arrangements such as in transversa and longitudinal fashion. However, in the ensuing description, such engine is transversely mounted at a lower portion of the Step through type two wheeled vehicle. It is contemplated that the concepts of the present invention may be applied to other types of vehicles and other types of internal combustion (IC) engine such as that of the two-stroke type within the spirit and scope of this invention. Further "front" and "rear", and "left" and "right" referred to in the ensuing description of the illustrated embodiment refer to front and rear, and left and right directions as seen from a rear portion of the internal combustion (IC) engine and looking forward. The detailed explanation of the Constitution of parts other than the present invention which constitutes an essential part has been omitted at suitable places.
[00012] Typically, in a two wheeled vehicle such as a scooter, a swinging internal combustion (IC) engine is located below the seat at a lower rear portion of the vehicle. The internal combustion (IC) engine is swingably supported by rear Suspension System and attached to the frame of the two wheeled vehicle and other end of the internal combustion (IC) engine is connected to a rear wheel of the two wheeled vehicle. The internal combustion (IC) engine is a heat engine which converts thermal energy obtained from burning of a fuel with an oxidizer (air) into mechanical energy, that energy is used in to perform mechanical work. A continuously variable transnüssion. (CVT) System forms a part of the internal combustion (IC) engine and is disposed on the rear portion of the internal combustion (IC) engine and mounted so as to be disposed on right or left of the two wheeled vehicle. In one embodiment, the continuously variable transmission (CVT) System is disposed so as to be oriented towards the left of the two wheeled vehicle as viewed from the rear direction of the two wheeled vehicle. The continuously variable transmission (CVT) System is enclosed within a crankcase of the internal combustion (IC) engine on the rear side of the internal combustion (IC) engine and the continuously variable transmission (CVT) System is enclosed by a crankcase cover also called a continuously variable transmission (CVT) cover, thus forming an enclosed Space within the continuously variable transmission (CVT) cover.

[00013] The crankcase in which continuously variable transmission (CVT) System is present extends rightward (RH) and leftward (LH) in the internal combustion engine (IC) engine width direction, said crankcase comprising of a top surface, and a bottom surface, and a plurality of side surfaces of the crankcase, wherein the side surfaces are substantially vertical and configured to extend between the top surface and the bottom surface. The part extended in rightward (RH) direction is known as a crankcase RH and the part extended in leftward (LH) direction is known as a crankcase LH. Similar to the crankcase, a crankshaft also extends rightward (RH) and leftward (LH) in the internal combustion engine (IC) engine width direction. This extension results in two parts of the crankshaft, first one is known as a crankshaft RH as the crankshaft extended in rightward (RH) direction and second one is known as a crankshaft LH as the crankshaft extended in leftward (LH) direction.
[00014] In the crankcase LH, of horizontally disposed engines such as that of scooter-type two-wheeled vehicles, an oil sump is provided in the bottom-side of the crankcase LH for continuous lubrication and cooling of a piston and a plurality of piston cylinder wall and other parts of the internal combustion (IC) engine. The lubrication and cooling of the piston, the plurality of piston cylinder wall and other parts of the internal combustion (IC) engine begins once an Operation cycle of thermal energy conversion into mechanical energy begins. Once the Operation cycle Starts, rotation of the crankshaft also Starts. As per the internal combustion engine (IC) engine construction, on the crankshaft LH a gear oil pump drive (GOPD) is mounted through press-fitting process and the gear oil pump drive (GOPD) are mated with an oil pump assembly. With all above-mentioned parts on the crankshaft LH. Due to that rotation of the crankshaft, the gear oil pump drive (GOPD) also Starts rotating, since the gear oil pump drive (GOPD) is in contact with the oil pump assembly which results the movement of lubricant oil from oil sump to lubricate and cool the piston, the plurality of piston cylinder wall and other parts of the internal combustion (IC) engine. During the continuous movement of lubricant oil for lubrication and cooling of the piston, the plurality of piston cylinder wall and other parts of the internal combustion (IC) engine a Situation arises in which lubricant oil goes out from the internal combustion (IC)

engine. To prevent that leakage from the internal combustion (IC) engine a cover member is provided with an oil seal housing to accommodate an oil sealing assembly. [00015] The oil sealing assembly consists of a tnetal ring as the inner skeleton which provides the structural stability to the oil sealing assembly, an outer skin part and an elastic member on the oil sealing assembly tends to provide Support to the outer skin part and prevents lubricant oil from leaking outside and also prevents the entry of dirt, moisture and contaminants from outside. Also, the oil sealing assembly is designed in a manner that the oil sealing assembly retains the lubricant oil and pressure inside the internal combustion (IC) engine. Further, there is no provision to Store lubricant oil for the lubrication and cooling of the oil sealing assembly.
[00016] The oil sealing assembly first inserted into the oil seal housing before it is disposed over the gear oil pump drive (GOPD). The oil sealing assembly works by creating a thin layer of lubricant oil between the inner diametrical surface of the oil sealing assembly and the gear oil pump drive (GOPD). Capillary action causes the oil to seep between the inner diametrical surface of the oil sealing assembly and the gear oil pump drive (GOPD), which results in the oil wetting the inner diametrical surface of the oil sealing assembly clear of the gear oil pump drive (GOPD). This thin layer is retained, and prevents leakage of lubricant oil through the inner diametrical surface of the oil sealing assembly. However, to retain that thin layer inside the internal combustion (IC) engine continuously for long running of the two-wheeled or three-wheeled vehicle is not easy.
[00017] As the portion near to cylinder of the internal combustion (IC) engine is
always exposed to high temperature and because of that the oil sealing assembly which
is near to crankshaft LH are subjected to high temperature generated by the internal
combustion (IC) engine parts. This high temperature generation results in causing
deformation of the oil sealing assembly even if the outer skin part of the oil sealing
assembly in general is made up of a material which is temperature resistant. This
affects the durability of the oil sealing assembly which in later stages causes several
Problems to the internal combustion (IC) engine. Further, the early deformation in the
oil sealing assembly results in lubricant oil leakage problem begins which leads to
drop in the internal combustion (IC) engine Performance and along with that the

internal combustion (IC) engine suffers quick lubricant oil drain which leads to lubrication System failure due to less lubrication of oil seal. Ultimately, the above-written problems end in the form of engine seizure.
[00018] Conventionally, the aböve-mentioned problem and other problems are solved
by lubricating the oil sealing assembly completely prior to assembly of the oil sealing
assembly into the oil seal housing of the cover member to wiühstand the temperature
variations caused by the internal combustion (IC) engine. But during the internal
combustion (IC) engine running conditions, the oil sealing assembly does not get
proper lubrication due to the absence of proper storage for lubricant oil for
continuously lubricating the oil sealing assembly. Further, lubricant oil does not reach
on the inner diametrical surface of the outer skin part of the oil sealing assembly once
the oil sealing assembly is assembled into the oil seal housing of the cover member.
That results as a non-lubrication of the outer skin part and other parts of the oil sealing
assembly during running of the two-wheeled vehicle which ends as an engine seizure
or other related problems. Also, this problem in general is addressed by providing
continuous replacement of oil sealing assembly after a particular run of the internal
combustion (IC) engine. Thus, it is a challenge to provide the internal combustion (IC)
engine for scooter-type two-wheeled vehicles with oil sealing assembly which controls
lubricant oil leakage without any need of replacing the oil sealing assembly.
[00019] In order to solve the above-said problems and other problems, the present
subject matter is providing a storage Space on inner circumferential surface of the oil
seal housing of the cover member to accommodate the oil sealing assembly for the
internal combustion (IC) engine of a two-wheeled vehicle, more particularly, for a
scooter-type two-wheeled vehicle. In an embodiment, the storage Space on inner
circumferential surface of the oil seal housing of the cover member formed through a
clearanace between the oil seal housing and the oil sealing assembly which allows
lubricant oil to flow upto the inner diametrical surface of the outer skin part of the oil
sealing assembly even after the oil sealing assembly assembled into the oil seal
housing of the cover member. With the clearance between the oil seal housing and the
oil sealing assembly, lubricant oil goes into the storage Space and stagnates over the oil
sealing assembly, and.contino.usly lubricates the oil sealine assembly during running of.

the internal combustion (IC) engine. Hence, there is no need to replace the oil sealing assembly frequently with füll control over lubricant oil leakage from the internal combustion (IC) engine for scooter-type two-wheeled vehicles. With above-stated arrangement, the durability of oil sealing assembly increases which controls the issue of lubricant oil leakage or quick lubricant oil drain and leads to improvement in the internal combustion (IC) engine Performance
[00020] In an embodiment, the internal combustion (IC) engine of the present subject matter includes a lubrication System, which has a centrally disposed connecting rod rotatably coupled with a crankshaft. Further, in an embodiment, the lubrication System of the present subject matter involves a lubrication path carrying lubrication oil through a LH side of the crankcase and the crankpin to a bigger end of the connecting rod.
[00021] In present embodiment, the internal combustion (IC) engine is provided with an oil sealing assembly on the LH side of the crankshaft. For instance, the oil sealing assembly of the present subject matter has an inner diametrical surface of an outer skin part that establishes a line contact with the outer circumferential surface of the gear oil pump drive (GOPD) mounted on the crankshaft LH. In an embodiment, the inner. circumferential surface of the oil sealing assembly is held tightly against the gear oil pump drive (GOPD) mounted on the rotating crankshaft by means of a elastic member, which ensures that the inner circumferential surface of the oil sealing assembly is elastically loaded and do not wobble or jump as a result of rotation of the crankshaft. In an embodiment, the outer skin part of the oil sealing assembly has an outer diametrical surface that is press fitted against the oil seal housing. Further, in an embodiment, the oil sealing assembly of the present subject matter ensures that any lubrication oil that passes through a Space provided between the gear oil pump drive (GOPD) mounted on the crankshaft LH and the cover member, should not leak from the internal combustion (IC) engine.
[00022] The present invention along with all the accompanying embodiments and their other advantages would be described in greater detail in conjunction with the figures in the following paragraphs.

[00023] Fig. 1 illustrates a left side view of a two-wheeled vehicle (100) typically called a scooter, in accordance with an embodiment of the present subject matter. A frontward direction is indicated by an arrow F, and a rearward direction indicated by an arrow R provided in the top center of first figure. The vehicle is extending from the front direction to the rear direction along the vehicle longitudinal axis (F-R).In an embodiment; the two-wheeled vehicle (100) of the present subject matter comprises a frame which is conventionally an under-bone chassis frame which provides a generally open central area to permit "step-through" mounting by a rider. Typically, the frame assembly comprises a head tube (not shown), a main tube (not shown), and a pair of side tubes (not shown). The head tube (not shown) is disposed towards the front portion (F), and the main tube (not shown) extends downwardly and rearwardly from the head tube (not shown) forming a flat horizontal step-through portion (117). The pair of side-tubes (not shown) extends rearwardly from the other end of the main tube (not shown) and supports vehicular attachments such as a seat (108), fuel tank assembly (not shown), a Utility box (not shown) and a pillion hand rest (118). In the rear end of the two wheeled vehicle (100) a rear lamp assembly (112) and a rear mud-guard (110) is provided .The head tube supports a steering tube (not shown) and further connected to the front Suspension System (121) at the lower end. A handlebar Support member (not shown) is connected to an Upper end of the steering tube and supports a handlebar assembly (106) which is having a mirror (105). Two telescopic front Suspension Systems (121) (only one is shown) Support a front wheel (119). The upper portion of the front wheel (119) is covcrcd by a front fender (103) mounted to the lower portion of the steering shaft. There is a front brake (not shown) and a rear brake (114) arranged on the front wheel (119) and a rear wheel (113) respectively. The rear wheel (113) is supported towards the rear side of the frame by an internal combustion (IC) engine (101) which is horizontally coupled swingably to the rear of the frame assembly of the two wheeled vehicle through a rear Suspension System (not shown). Over the rear wheel (113) a body panel (125) is disposed of to support the seat (108). The internal combustion (IC) engine (101) transfers the drive directly to the rear wheel (113) as it is coupled directly to it. The internal combustion (IC) engine (101) comprises a continuously variable transmission (CVT) system, said CVT System

disposed leftward of the internal combustion (IC) engine (101) in the vehicle width direction. The CVT System is enclosed by a CVT cover (150), the outer portion of the CVT cover (ISO) is seen in the Fig. 1 with reference to the two wheeled vehicle.
[00024] Fig. 2 illustrates a left side view of the rear portion of the two wheeled vehicle (100) illustrating a swingable internal combustion (IC) engine (101) in accordance with the embodiment of the present subject matter. Arrows provided in the top right of second figure depicts direction with respect to the vehicle, wherein an arrow F denotes front direction, an arrow R indicates rear direction, an arrow LH denotes leftward direction, an arrow RH denotes rightward direction. The vehicle is extending from the front direction to the rear direction along the vehicle longitudinal axis (F-R). The internal combustion (IC) engine (101) comprises a cylinder block (not shown) on which a cylinder head (not shown) is disposed forming a combustion Chamber (not shown) at the junction. The cylinder head and cylinder block is enclosed by a shroud assembly (206) as a part of a forced air cooling System to extract heat from the hot zones of the internal combustion (IC) engine (101) including the cylinder head and cylinder block. A cylinder head cover (203) is disposed above the cylinder head enclosing a valve train mechanism. An air filter assembly (201) draws air inside and filters the same, and it is further throttled by a throttle body (207) before being mixed with fuel by a fuel injector (204) and supplied to the cylinder head by an intake pipe (205). Air fuel mixture is burnt in the combustion Chamber which causes a piston to reciprocate within the cylinder block. The cylinder block and cylinder head assembly is mounted on a crankcase. The CVT System is enclosed within a CVT cover (150). The CVT cover (150) comprises a kick-starter assembly (not shown) including a kick-start lever (202) and a ratchet mechanism (not shown) configured to engage with the crankshaft on the front side of the internal combustion (IC) engine (101).
[00025] Fig. 3 illustrates an exploded view of an assembly of a crankshaft over a cover member with an oil sealing assembly in accordance with an embodiment of the present subject matter. Arrows provided in the top left of third figure depicts direction with respect to the vehicle, wherein an arrow F denotes front direction, an arrow R indicates rear direction, an arrow LH denotes leftward direction, an arrow RH denotes

rightward direction. The vehicle is extending from the front direction to the rear direction along the vehicle longitudinal axis (F-R). In an embodiment, the internal combustion (IC) engine (not shown) comprises a crankcase LH (195), a crankshaft LH side (190) and an oil sealing assembly (180). Over the crankshaft LH side (190), a gear oil pump drive (GOPD) (191) is mounted for transferring rotation of the crankshaft LH side (190) to an oil pump assembly (not shown). Further, the oil sealing assembly (180) consists three elements; firstly a metal ring (not shown) as the inner skeleton which provides the structural stability to the oil sealing assembly (180), secondly an outer skin part (not shown) whose outer diametrical surface is press fitted against an oil seal housing (170) and the outer skin part (not shown) has an inner diametrical surface which is spring-loaded against the outer diametrical surface of the gear oil pump drive (GOPD) (191), and thirdly an elastic member (not shown) tends to provide Support to the outer skin part (not shown) of the oil sealing assembly (180) and prevents lubricant oil from leaking outside and also prevents the entry of dirt, moisture and contaminants from outside. Further, the inner diametrical surface of the outer skin part (not shown) of the oil sealing assembly (180) is in contact with a storage space (170a) provided on inner circumferential surface of the oil seal housing (170). The storage space (170a) on inner circumferential surface of the oil seal housing (170) is provided in a way to lubricate and cool the inner diametrical surface of the outer skin part (not shown) of the oil sealing assembly (180) continuously during running of the internal combustion (IC) engine (101). In an embodiment, the storage space (170a) on inner circumferential surface of the oil seal housing (170) of the cover member (160) formed through a clearanace (not shown) between the oil seal housing (170) and the oil sealing assembly (180) which allows lubricant oil to flow upto the inner diametrical surface of the outer skin part (not shown) of the oil sealing assembly (180) even after the oil sealing assembly (180) assembled into the oil seal housing (170) of the cover member (160). This eliminates the need of frequent replacement of the oil sealing assembly (180) inside the internal combustion (IC) engine. Further, in present embodiment, the oil sealing assembly (180) of the present subjeet matter ensures that any lubricant oil that passes through a space (not shown) provided between the gear oil pump drive (GOPD) (191) mounted on the crankshaft LH (190) and the cover member

(160), is providing passage to lubricant oil to reach upto the outer skin part (not shown) of the oil sealing assembly (180) without any kind of leaking. The above-mentioned arrangement also controls oil leakage in the internal combustion (IC) engine. With above-stated arrangement, the durability of oil sealing assembly (180) increases which controls the issue of lubricant oil leakage or quick lubricant oil drain and leads to improvement in the internal combustion (IC) engine Performance. Further, in present embodiment, the storage space (170a) is located parallel to the crankcase LH (195).
[00026] Fig. 4 illustrates a detailed cross-sectional view of a crankcase LH assembly taken along PQ axis as shown in Fig. 3 in accordance with an embodiment of the present subject matter. Arrows provided in the top left of fourth figure depicts direction with respect to the vehicle, wherein an arrow F denotes front direction, an arrow R indicates rear direction, an arrow LH denotes leftward direction, an arrow RH denotes rightward direction. The vehicle is extending from the front direction to the rear direction along the vehicle longitudinal axis (F-R). In an embodiment, the gear oil pump drive (GOPD) (191) is mounted on the crankshaft LH side (190) for transferring rotation of the crankshaft LH side (190) to the oil pump assembly (not shown) for lubricating and cooling a piston (not shown), a plurality of piston cylinder wall (not shown) and other parts of the internal combustion (IC) engine. During the continuous movement of lubricant oil for lubrication and cooling of the piston (not shown), the plurality of piston cylinder wall (not shown) and other parts of the internal combustion (IC) engine a Situation arises in which lubricant oil goes out from the internal combustion (IC) engine. To prevent that leakage of lubricant oil from the internal combustion (IC) engine a cover member (160) is provided with the storage space (170a) on inner circumferential surface of the oil seal housing (not shown) to accommodate the oil sealing assembly (180). After the inclusion of the storage Space (170a) on inner circumferential surface of the oil seal housing (not shown), the oil sealing assembly (180) Start storing lubricant oil which comes through the clearance (not shown) formed between the oil seal housing (170) and the oil sealing assembly (180). The clearance (not shown) receives lubricant oil from a space (not shown) located between the gear oil pump drive (GOPD) (191) which is mounted on the

crankcase LH (190) and the cover member (160). The continuous lubrication of the
oil sealing assembly (180) during running of the internal combustion (IC) engine (not
shown) takes place due to the presence of the storage space (170a) between the nil seal
housing (not shown) and the oil sealing assembly (180) which allows lubricant oil to
störe and stagnate on the inner diametrical surface of the outer skin part (not shown) of
the oil sealing assembly (180). Capillary action causes the lubricant oil to seep
between the inner diametrical surface of the outer skin part (not shown) the oil sealing
assembly (180) and the oil seal housing (not shown), which results in the oil wetting
the inner diametrical surface of the outer skin part (not shown) the oil sealing
assembly (180). Due to the presence of the storage space (170a) the frequent
requirement of replacing the oil sealing assembly (180) after a particular distance of
running of the internal combustion (IC) engine (not shown) is not there anymore.
[00027] Fig. 5 illustrates a front cross-sectional view of an oil sealing assembly
assembled over the oil seal housing in the cover member (160) in accordance with an
embodiment of the present subject matter. Arrows provided in the top left of fifth
figure depicts direction with respect to the vehicle, wherein an arrow F denotes front
direction, an arrow R indicates rear direction, an arrow LH denotes leftward direction,
an arrow RH denotes rightward direction. The vehicle is extending from the front
direction to the rear direction along the vehicle longitudinal axis (F-R). In an
embodiment, the cover member (160) is shown with the oil sealing assembly (180) is
housed in inner circumferential surface of the oil seal housing (not shown) in the cover
member (160) which has the storage space (170a). The storage space (170a) on the oil
seal housing (not shown) Stores lubricant oil Coming through the clearance (305)
between the oil seal housing (not shown) and the oil sealing assembly (180) and
stagnates lubricant oil on the inner diametrical surface (181a) of the outer skin part
(181) of the oil sealing assembly (180). With above-mentioned arrangement the inner
diametrical surface (181a) of the outer skin part (181) of the oil sealing assembly
(180) continuously get lubrication and cooling during running of the internal
combustion (IC) engine (not shown). This continuous lubrication of the inner
diametrical surface (181a), increases durability of the oil sealing assembly (180) and
enhances cooling capacity_of the oil sealing assembly (180).Ultimately, increase in

durability and cooling of oil sealing assembly (180) controls the issue of lubricant oil leakage or quick lubricant oil drain and leads to improvement in the internal combustion (IC) engine (not shown) Performance. Further, in an embodiment, the oil sealing assembly (180) consists of a metal ring (182) as the inner skeleton which provides the structural stability to the oil sealing assembly (180), the outer skin part (181) is made of set of materials from nitrile rubber, Silicone, Poly acrylate, Fluro elastomer also popularly known as Viton, and Poly tetra Fluro Ethylene (PTFE), and the elastic member (183) on the inner diametrical surface (181a) of the oil sealing assembly (180) tends to provide Support to the inner diametrical surface (181a) of the outer skin part (181) of the oil sealing assembly (180).
[00028] Fig. 6 illustrates a path of lubricant oil flow in accordance with an embodiment of the present subject matter. In an embodiment, the internal combustion (IC) engine of the present subject matter includes a lubrication System. Further, in an embodiment, the lubrication System of the present subject matter involves a lubrication path carrying lubrication oil through a LH side of the crankcase (not shown). In an embodiment, the internal combustion (IC) engine (not shown) is provided with an oil sealing assembly (180) has the inner diametrical surface of the outer skin part (181) that establishes a line contact with the outer circumferential surface of the gear oil pump drive (GOPD) (191) mounted on the crankshaft LH (not shown). In an embodiment, the inner circumferential surface of the oil sealing assembly (180) is held tightly against the rotating crankshaft LH (not shown) by means of the elastic member (183), which ensures that the inner circumferential surface of the oil sealing assembly (180) is elastically loaded and do not wobble or jump as a result of rotation of the crankshaft. Further, in an embodiment, the outer skin part (181) of the oil sealing assembly (180) has an outer diametrical surface that is press fitted against the oil seal housing (not shown). Further, in an embodiment, the storage space (170a) on the oil seal housing (not shown) of the present subject matter ensures that any lubrication oil that comes through the clearance (305) formed between between the oil seal housing (not shown) and the oil sealing assembly (180) stagnates on the inner diametrical surface (181a) of the outer skin part (181) of the oil sealing assembly (180) even after the oil sealing assembly (180) assembled into the oil seal housing (not shown) of the _

cover member (160). Once the lubricant oil stagnates over the oil sealing assembly (180) then the lubrication and cooling of the oil sealing assembly (180) begins continously during running of the internal combustion (IC) engine (not shown). Hence, there is no need to replace the oil sealing assembly frequently with füll control over lubricant oil leakage from the internal combustion (IC) engine for scooter-type two-wheeled vehicles. The presence of the storage Space (170a) on inner circumferential surface in the oil seal housing (not shown), also prevents lubricant oil.from any kind of leaking.
[00029] Futher, in present embdoiment, lubricant oil comes from the clearance (305) into the storage space (170a) by following the path shown through arrows in the Fig.5. Before passing to the clearance (305) the lubricant oil passes from passage the Space (306) provided between the gear oil pump drive (GOPD) (191) which is mounted on the crankcase LH (not shown) and the cover member (160) by following the path shown through arrows in the Fig.5. Once lubricant oil touches the inner diametrical surface (181a) of the outer skin part (181) of the oil sealing assembly (180), Stagnation of lubricant oil begins. This results in continuous lubrication and cooling of the oil sealing assembly (180) during running of the internal combustion (IC) engine (not shown). Further, the continuous lubrication and cooling of the inner diametrical surface (181a) of the outer skin part (181) of the oil sealing assembly (180) enhahces durability of the oil sealing assembly (180). In an embodiment, the clearance (305) formed between between the oil seal housing (not shown) and the oil sealing assembly (180) is of the Order of 30-100 microns, and most preferably, in a ränge of 50-70 micron. The above-stated ränge provided for the clearance (305) which came due to the storage Space (170a) on the inner circumferential surface in the oil seal housing (not shown) is preventing the further passage of the lubrication oil. Further, in an embodiment, the space (306) is provided between the gear oil pump drive (GOPD) (191) which is mounted on the crankcase LH (190) and the cover member (160) is in a ränge of 5-20 microns to provide passage to lubricant oil to reach up to the clearance (305). The cover member (160) of the present subject matter includes the clearance (305) formed for providing the storage space (170a) on the inner circumferential surface in the oil seal housingfnot shown), and for Controlling the oil leakage from the

craakcase LH (not shown) in any circumstances and simultaneously provide enhanced durability to the oil sealing assembly (180).
[00030] While preferred embodiments of the present subject matter have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing the scope and spirit of the present subject matter.