DESC:FIELD OF INVENTION
[0001] The present invention relates to a transmission system and more particularly to an apparatus for guiding drive chain of said transmission system of a two-wheeled vehicle.
BACKGROUND OF INVENTION
[0002] An internal combustion engine converts thermal energy obtained from burning of a fuel with an oxidizer (air) into mechanical energy, which can be employed to do a wide variety of mechanical work. It is used in a wide range of applications including providing motive force for movement of an automobile. The internal combustion (IC) engine, among other components, has a cylinder on top of which a cylinder head is mounted, and receives a reciprocating piston from the bottom. During operation of the internal combustion engine, the burning of fuel and oxidizer occurs in the cylinder block and transfers mechanical energy to the reciprocating piston. The piston later transfers it to a crankshaft which in turn powers the vehicle.
[0003] Typically, a two-wheeled vehicle is often powered by internal combustion engines having output shafts. In some motorcycles to be particular, the output shaft is coupled to a final drive mechanism through a change speed transmission featuring a variety of gear ratios that can be selectively engaged. The output of the change speed transmission, in turn, drives an output pulley (or sprocket). Torque from the output pulley (or sprocket) is transferred to an input pulley (or sprocket) disposed on a rear wheel. A flexible drive member, such as a belt or chain for instance, preferably extends between the two pulleys (or sprockets).
[0004] Accordingly, majority of motorcycles rely on the sprocket and drive chain method of transmission of power from the engine to the rear wheel. Although motorcycle chains are mechanically efficient and entirely suitable for the purpose originally intended, motorcycle drive chain improvements have not kept pace with modern requirements imposed by dramatic increases in motorcycle engine power and by the environment where many motorcycles are now utilized. Generally, the drive chain being used is the one of the most essential elements. It has been updated in cases of vehicles on a higher power range. However, the drive chains being used are still succumbent to failure modes.
[0005] The drive chains provided in the vehicle are being used continuously and wear off over a period of time. There have been instances when the drive chain wears off and slacks down. In furtherance to it, a catastrophic failure is also seen when the chain wears off and comes out of the sprocket due to the slacking caused because of wearing off. Moreover, the drive chain when slacks down tends to touch other parts of the vehicle too which in turn hampers them. Thus, to provide a solution to the above stated problems a chain guide is provided which is attached to the frame assembly to support and guides the drive chain. The chain guides provides a support to the drive chain preventing it from slacking and in turn guides it as well. However, these chain guides also experience failure modes related to noise and vibration. The drive chain always experiences a slacked and whipping movement in a running condition of the vehicle. Thus, such movements of the drive chain transfer the phenomena of noise and vibration to the chain guide which is later forwarded to the frame assembly to which the chain guide is attached. Thus, there is an additional noise and vibration problem which the frame assembly faces due to the drive chain and chain guide present in the transmission system of the vehicle. Hence it is desired to have an improved support for the drive chain and transmission system which supports the drive chain and eliminates the problem of noise and vibration associated with it.
BRIEF DESCRIPTION OF DRAWINGS
[0006] The detailed description of the present subject matter is described with reference to the accompanying figures. Same numbers are used throughout the drawings to reference like features and components.
[0007] Figure 1 illustrates a left side view of an exemplary two-wheeled vehicle, in accordance with an embodiment of the present subject matter.
[0008] Figure 2 illustrates an enlarged partial view of an internal combustion engine and a transmission system in accordance with an embodiment of the present subject matter.
[0009] Figure 3 illustrates a perspective view of a chain guide in accordance with an embodiment of the present subject matter.
[00010] Figure 4 illustrates a perspective side view of the chain guide attached to a bracket in accordance with an embodiment of the present subject matter.
[00011] Figure 5 illustrates an exploded view of the chain guide in accordance with an embodiment of the present subject matter.
[00012] Figure 6 illustrates a perspective rear view of the chain guide with a drive chain disposed over it in accordance with an embodiment of the present subject matter.
DETAILED DESCRIPTION
[00013] Generally, the internal combustion engine is the power unit of the vehicle enabled to provide the required drive. Typically, the internal combustion engine is coupled to the drive wheel, which is generally the rear wheel. The internal combustion engine is provided with a substantial amount of air-fuel mixture which needs to be burnt to generate the required power. An inlet port is provided through which the air-fuel mixture enters the internal combustion engine. The inlet valve is disposed on a cylinder head of the internal combustion engine where the combustion occurs. A cylinder is provided which accommodates a piston of the internal combustion engine, where the cylinder head is disposed on top of the cylinder. The cylinder head is mounted to accommodate and receive the to-and-fro motion of the piston reciprocating from the bottom in an upward direction. The piston described above is connected to the crankshaft through a connecting rod. On combustion of the air-fuel mixture, the piston goes down at a high speed and transfers the energy generated during combustion to a crankshaft through the connecting rod thereby driving the crankshaft. In this way, the reciprocatory motion of the piston is converted to rotary motion of the crankshaft which in turn powers the vehicle.
[00014] Typically there are three basic ways to transfer the power from internal combustion engine to the rear wheel: drive chain, belt or shaft. A drive chain mechanism is by far the most common mechanism used. In this system, a sprocket mounted to the output shaft (or output sprocket) is connected to a sprocket attached to the rear wheel (or wheel sprocket) of the motorcycle by a metal chain. When the transmission turns the smaller front sprocket, power is transmitted along the chain to the larger rear sprocket, which then turns the rear wheel. Thus, this is the basic drive chain mechanism through which power from the internal combustion engine is transferred to the rear wheel.
[00015] However, the drive chain is susceptible to slipping during periods of rapid acceleration and deceleration. For instance, during a period of rapid acceleration, the output sprocket is driving the wheel sprocket. Accordingly, the drive chain slacks on the side of the sprockets moving in the direction from the wheel sprocket to the output sprocket. In addition, during rapid deceleration, the inertia of the rear wheel acts to drive the output pulley sprocket. Accordingly, the drive chain slacks on the side of the sprockets moving in the direction from the output sprocket to the wheel sprocket.
[00016] Due to the periodic slacking described above, the connection between the sprockets and the drive chain can become unstable. For instance, the drive chain can skip relative to the sprocket in a manner which affects the overall transfer of power between the internal combustion engine and the rear wheel. In addition, as the drive chain slips relative to the sprockets, the drive chain can be thrown from the output sprocket and disable the motorcycle. Thus, the vehicle will require frequent servicing to replace the drive chain on the sprockets. Moreover, the slackened portions of the drive chain can slap against other components of the motorcycle resulting in undue noise and unnecessary wear of both the drive chain and the components being slapped.
[00017] In general, drive chain loosening is a drawback inherited in transmission systems due to continuous force acting on it. Once the drive chain is loosened, a common practice is to manually tighten the drive chain. If not tightened on time; such a loosened drive chain may get off from the drive sprocket while vehicle is running which may hit the crankcase or nearby automotive parts such as gear shift lever thereby causing damage to the aforesaid automotive parts which at the same time poses a threat to safety of a rider. In order to avoid such a problem, there is a practice to provide a chain guide to maintain the drive chain in its intended position with a required tightness. This chain guide can be made up of rigid material suitable for a pre-determined intended life. Such chain guides are generally attached to a frame assembly at a front portion of the vehicle when seen from front. The chain guide is located at a front portion of the vehicle because of its rigidity as compared to the rear side.
[00018] Though such kind of chain guides can take care of issues related to loosening of chain, there are other side effects and failure modes associated with it. There is a constant whipping motion which the drive chain experiences with the movement of the vehicle. Due to such a motion it is a common tendency for the drive chain to hit the chain guide. These features further results in the problem of noise and vibration which the chain guide has to experience. Furthermore, the noise and vibration caused is also transferred to the frame assembly to whom the chain guide is attached. In addition to it, there are other problems associated with the chain guides as well. The chain guide gets damaged too due to the constant pressure of the drive chain and also because of the whipping and hitting it experiences. In some of the known arts, a flexible chain guide is also provided which adjusts with the motion of the drive chain and vehicle. However, such flexible chain guides are very bulky, have a complex layout with a high manufacturing cost.
[00019] Hence, an objective of the present subject matter is to provide a support system for the drive chain which eliminates the noise and vibrational problems it faces and transfers to the frame assembly. In an addition to it, an improved support system and chain guide is required which does not gets damaged because of the drive chain. According to one aspect of the present subject matter, a resilient member is provided inside at least one of apertures formed in the chain guide. The aperture on the chain guide is used for inserting a resilient member and a bolt for mounting chain guide on a vehicle frame member.
[00020] According to an addition aspect the resilient member is preferably a frustum shaped member inserted inside the aperture formed on the chain guide, with the outer periphery of the resilient member in contact with the chain guide. The resilient member further comprises of an inner hole to accommodate a bush (preferably cylindrical shaped) to receive the bolt for mounting the chain guide along with the resilient member to the vehicle frame assembly.
[00021] In an embodiment, an internal combustion engine comprises of a cylinder head where the combustion occurs to provide the needed power for the forward motion of the vehicle. The internal combustion (IC) engine, among other components, comprises of a cylinder on top of which the cylinder head is mounted. The cylinder head is mounted to accommodate and receive the to-and-fro motion of the piston reciprocating from the bottom in an upward direction. Once the air-fuel mixture is burnt, the piston transfers the energy generated during combustion to a crankshaft through a connecting rod. Thus, the reciprocatory motion of the piston is converted into a rotary motion of the crankshaft. It is the rotary motion of the crankshaft which in turn powers the vehicle.
[00022] In an embodiment, a transmission system is provided which transfers the power generated by the internal combustion to the rear wheel. The power transfer is done through sprockets and drive chain provided in the vehicle. In an embodiment, an output sprocket is provided which is connected to a wheel sprocket attached to the rear wheel of the vehicle. The output sprocket rotates along with the working of the internal combustion engine. The power from the output sprocket is transferred to the wheel sprocket through a drive chain which connects both the sprockets. Thus, the output sprocket starts rotating as soon as the internal combustion starts functioning and the rotation of the output sprocket is transferred to wheel sprocket through drive chain connecting both of them. Therefore, through this the wheel sprocket also rotates resulting in the movement of the rear wheel and the vehicle.
[00023] In an embodiment, a chain guide is provided mounted on a bracket which is attached to a frame assembly of the two-wheeled vehicle. The chain guide is disposed in a front portion of the vehicle, attached to the frame assembly through the bracket disposed near the crankcase, lying just below the drive chain. In an embodiment, the chain guide is mounted to the bracket, wherein the bracket is attached to the frame assembly. The chain guide comprises of two apertures formed on its down most portion through which bolts are inserted to attach it to the bracket. In an embodiment, the chain guide comprises of an elevated rail portion extending in the drive chain length direction. The drive chain is located and supported on the elevated rail portion. The drive chain moves along the elevated rail portion transferring power from the output sprocket to the wheel sprocket. In an embodiment, the chain guide comprises of a guide space formed beside the elevated rail portion at lower plane as compared to the elevated rail portion. The guide space provides a free space for the drive chain to move without being hindered.
[00024] In an embodiment, the chain guide comprises of one or more apertures through which the chain guide is mounted on the bracket. One or more resilient members are provided which are disposed in the apertures formed in the down most portion of the chain guide. In an embodiment, the resilient members inserted in the chain guide are frustum shaped, such that the outer end with greater outer diameter and thicker material is disposed around the elevated rail portion and the other outer end with the comparatively lesser outer diameter and material is disposed around the end of guide space. The resilient members provided are made of rubber, so that it absorbs the noise and vibrations being transferred to the chain guide from the hitting and whipping of drive chain. The resilient members absorb the sounds and vibrations and do not allow it to be transferred to the frame assembly. In an embodiment, the resilient members are frustum shaped because it makes the assembly process, i.e. insertion and removal of the resilient members in the chain guide easy. Furthermore, the resilient members are frustum shaped because while inserting such rubber materials in the apertures there is no requirement of a stopper. Had the resilient members been cylindrical shaped or of any other shape there would have been a requirement of an extra stopper to be inserted there for a stable mounting. In furtherance to it, the outer end with greater diameter and larger material is disposed near the elevated rail portion because the drive chain is mounted over it, and it moved along the rail portion itself. Thus, the elevated rail portion experiences the maximum amount of noise and vibrations which requires an extra rubber base to absorb the noise and vibrations generated due to it.
[00025] In an embodiment, one or more bushes which are cylindrical shaped are inserted in the resilient members. The bolts used for mounting the chain guide to the bracket are inserted in the apertures only after the bushes are provided within the resilient members. The bushes are provided within the resilient members because there would be no stopping and mounting of the bolts if only a resilient member made of rubber had been used. Thus, the bushes withstand the tightening tension and pressure of the bolts which the resilient members made of rubber would not have been able to. Thus, through the present system the chain guide is stably mounted and the noise and vibrations are also absorbed effectively.
[00026] Thus, the present subject matter provides a chain guide attached to a frame assembly through a bracket on which it is mounted. The chain guide provided here provides an advantage of stable mounting with an efficient absorption of sound and vibration transferred to it through the whipping and hitting of the drive chain. In furtherance to it the present chain guide is able to achieve the following advantages without using a complex or heavy structure, which is easy to service and maintain. Furthermore, the present subject matter presents a simple yet effective layout which does not requires unnecessary extra complex members to be added, thus is cost effective as well.
[00027] The aforesaid and other advantages of the present subject matter would be described in greater detail in conjunction with the figures in the following description.
[00028] Arrows provided in the top right corner of each figure depicts direction with respect to the vehicle, wherein an arrow F denotes front direction, an arrow R indicated R direction, an arrow Up denotes upward direction, an arrow Dw denoted downward direction, an arrow Rh denotes right side, an arrow Lh denoted left side, as and where applicable.
[00029] Figure 1 illustrates a side view of an exemplary two-wheeled motorcycle (100), in accordance with an embodiment of the present subject matter. The present subject matter is applicable for all types of vehicles using a drive chain mechanism in their transmission system. Hence, hereinafter it would be referred as two-wheeled vehicle or vehicle. The vehicle (100) includes a frame assembly (105) that extends from a head tube (not shown), which is disposed in the front portion of the vehicle (100), wherein said frame assembly extends towards a rear portion of the vehicle (100). The frame assembly (105) includes a mainframe (not shown) comprising a main tube extending rearward from a rear portion of the head tube and a down tube (not shown) that extends rearwardly downward from the head tube. The frame assembly (not shown) may further comprise a sub-frame formed by a pair of rear tubes (not shown) that extend obliquely rearward from the main frame. An internal combustion engine (110) is provided acting as a power unit of the vehicle (100), wherein the power unit may also include a traction/electrical motor (not shown). A front portion of a swing arm assembly (not shown) is swingably connected to the main frame of the frame assembly (105) and rear portion of the swing arm assembly (not shown) rotatably supports a rear wheel (115). The rear wheel (115) is functionally coupled to the internal combustion engine (110) through a transmission system (120). An output socket (175) is provided in the internal combustion engine (110) whose power is transferred to a wheel sprocket (180) disposed in the rear wheel (115). A rear fender (125) disposed upwardly of the rear wheel (115) and covers at least a portion of the rear wheel (115). Further, the swing arm assembly (not shown) is coupled to the frame assembly (105) through one or more rear suspension(s) (130). An exhaust emission system (not shown) is connected to the internal combustion engine (110), disposed on a lateral side of the vehicle (100) for a safe emission of exhaust to the atmosphere. A pair of front forks (135) supports a front wheel (140) and is steerably supported by the head pipe. A handlebar assembly (145) is connected to an upper portion of the pair of front fork (135). Further, a front fender assembly (150) covers at least a portion of the front wheel (140) and the front fender assembly (150) is mounted to the front forks (135).
[00030] A fuel tank (155) is mounted to the main tube of the frame assembly (105) and disposed rearwardly of the handlebar assembly (145). A seat assembly (160) is disposed rearwardly of the fuel tank assembly (155) and supported by the pair of rear tubes. Further, the vehicle (100) comprises a headlamp assembly (165) that is disposed forwardly of the head tube. The vehicle (100) also comprises of a pillion handle (170) disposed rearwardly of a side panel assembly and extend along the pair of rear tubes.
[00031] Figure 2 illustrates an enlarged partial view of the internal combustion engine (110) and transmission system (120) in accordance with an embodiment of the present subject matter. In an embodiment, the internal combustion engine (110) comprises of a crankcase (205) in which a crankshaft (not shown) is located. Furthermore, the transmission system (120) comprises of a drive shaft (210) disposed on the crankcase of the internal combustion engine (110). In addition to it, the output sprocket (175) is mounted over the drive shaft (210). In an embodiment, the transmission system (120) comprises of a drive chain (215) mounted over the output sprocket (175). The drive chain (215) connects the output sprocket (175) and the wheel sprocket (180) disposed on the rear wheel (115). In an embodiment, the drive shaft (210) rotates as long as the internal combustion engine (110) is running. Thus, the output sprocket (175) mounted on the drive shaft (210) also rotates along with it. Thus, the power of internal combustion engine (110) is transferred form the output sprocket (175) to the wheel sprocket (180) through the drive chain (215) connecting both of them. In an embodiment, the transmission system (120) comprises of a chain guide (220) mounted on the frame assembly (105) through a bracket (shown in fig. 4) attached to it. The chain guide is disposed in a front portion of the vehicle when seen from a front side of the vehicle. Furthermore, the chain guide (220) is located near the rear portion of the crankcase (205) of the internal combustion engine (110). In an embodiment, the chain guide (220) is purposely provided on a front portion of the vehicle (100 because the rear portion of the vehicle (100) is not rigid and stable. Thus to provide a better stability to the chain guide (220) it is mounted on a front portion of the vehicle (100). In an embodiment, the chain guide (220) supports the drive chain (215) and acts as a guide without allowing it to slack and come out of the output sprocket (175). Over a period of time, after a continuous wearing of the drive chain (215), it starts to slack and hit other adjoining parts, and in some cases comes out of the output sprocket (175) as well. Therefore, the chain guide (220) is used to support drive chain (215) and prevent it from above stated failure modes.
[00032] Figure 3 illustrates a perspective view of the chain guide (220) in accordance with an embodiment of the present subject matter. In an embodiment, the chain guide (220) comprises of an elevated rail portion (305) on which the drive chain is mounted, wherein said elevated rail portion (305) supports the drive chain (215). In furtherance to it, the elevated rail portion (305) also provides a surface along which the drive chain (215) moves. Furthermore, the chain guide (220) comprises of a guide space (310) formed behind the elevated rail portion (305) and at a comparatively lower plane as that of the elevated rail portion (305). The guide space (310) proves a free space to the drive chain (215) to move without being hindered. In an embodiment, the chain guide (220) comprises of a one or more apertures (315, 320), namely a first aperture (315) and a second aperture (320) formed beside each other at a down most portion of the chain guide. A one or more resilient members (325, 330) namely a first resilient member (325) and a second resilient member (330) made of rubber are inserted in the one or more apertures (315, 320), wherein a one or more bushes (335, 340) namely a first bush (335) and a second bush (340) are further inserted within the one or more resilient members (325, 330). Thus, it can be observed that the chain guide (220) is binoculars like structure with a wall shaped elevated rail portion (305) extending with a greater height at its front portion.
[00033] Figure 4 illustrates a perspective side view of the chain guide (220) attached to the bracket (405) in accordance with an embodiment of the present subject matter. In an embodiment, the chain guide (220) is detachably attached to the bracket (405) through a pair of nuts (420, 425) and a pair of bolts (410, 415) (also referred as nut and bolt or nut and bolt mechanism). As described above, the chain guide (220) comprises of the elevated rail portion (305) and guide space (310). In an embodiment, a first bolt (410) is inserted in the first bush (335) disposed in the first resilient member (325) located in the first aperture (315). Whereas, a second bolt (415) is inserted in the second bush (340) disposed in the second resilient member (330) located in the second aperture (320). The bolts (410, 415) provided are tightened so that the chain guide (220) is securely attached to the bracket (405). In furtherance to it, the nuts (420, 425) are disposed on a rear surface of the bracket (405) to hold the bolts (410, 415). Thus, the chain guide (220) is securely attached to the bracket (405) through the nut (420, 425) and bolt (410, 415) mechanism.
[00034] Figure 5 illustrates an exploded view of the chain guide in accordance with an embodiment of the present subject matter. In an embodiment, the chain guide (220) comprises of the one or more apertures (315, 320), namely the first aperture (315) and the second aperture (320) formed beside each other in a down most of the chain guide (220). The one or more apertures (315, 320) is made to accommodate the frustum shaped one or more resilient members (325, 330), such that the first resilient member (325) is disposed in the first aperture (315) and the second resilient member (330) is disposed in the second aperture (320). In an embodiment, the one or more bushes (335, 340) is disposed in the one or more resilient members (325, 330), such that the first bush (335) is inserted in the first resilient member (325) and the second bush (340) is inserted in the second resilient member (330). The bolts (410, 415) are inserted in the one or more bushes (335, 340) and tightened to securely attach the chain guide (220) to the bracket (405). In an embodiment, the one or more resilient members (325, 330) being used have a frustum shaped profile. The profile of the one or more resilient members (325, 330) is made frustum shaped to allow and easy insertion and removal of the one or more resilient members (325, 330) in the chain guide. Furthermore, the by making the profile in shape of a frustum the need of a separate stopper for a stable mounting of the resilient members is eliminated. Had the profile been cylindrical or of any other shape there would have been a requirement of adding an extra stopper for a stable mounting of the one or more resilient members (325, 330) within the one or more apertures (315, 320). Since the profile of the one or more resilient members (325, 330) is frustum shaped, it means the outer diameter of one of its end would be greater than the other end. In an embodiment, the first resilient member (325) comprises of a first end (F) having an outer diameter of D1, and a second end (S) having an outer diameter of D1’. As per the present subject matter D1 is greater than D1’, wherein the first resilient member (325) comprises of an inner diameter (d1) which is uniform through out. Thus, it also means that the amount of rubber on the first end (F) having diameter D1 is more as compared to amount of rubber on the second end (S) having outer diameter D1’. Similarly, the second resilient member (330) comprises of a first end (F’) having an outer diameter of D2, and a second end (S’) having an outer diameter of D2’. As per the present subject matter D2 is greater than D2’, wherein the second resilient member (330) comprises of an inner diameter (d2) which is uniform through out. Therefore, it means that the amount of rubber on the first end (F’) having diameter D2 is more as compared to amount of rubber on the second end (S’) having outer diameter D2’. In an embodiment, the one or more resilient members (325, 330) are disposed in the one or more apertures (315, 320) in such a fashion that the first end (F, F’) having outer diameters of D1 & D2 are located in a region below the elevated rail portion (305), wherein the second end (S, S’) having an outer diameter D1’ & D2’ are located in a region below the guide space (310). The one or more resilient members (325, 330) are located in such a fashion since the elevated rail portion (305) experiences the maximum noise and vibration effects because the drive chain (215) passes and moves over it, Whereas, the noise and vibrational effects experienced by the guide space (310) is comparatively less, so the second end (S, S’) having diameter D1’ & D2’ is located below it.
[00035] In an embodiment, the first bush (335) being a cylindrical shaped element has a uniform diameter d1’ which is equal to the inner diameter d1 of the first resilient member (325). Similarly, the second bush (340) also being a cylindrical shaped element has a diameter d2’ which is equal to the inner diameter d2 of the second resilient member (330). Thus, by using such mechanism the one or more bushes (335, 340) are inserted and perfectly fit in the one or more resilient members (325, 330). In an embodiment, the bolts (410, 415) are inserted in the one or more bushes (335, 340) and tightened to securely attach the chain guide (220) to the bracket. The one or more bushes (335, 340) are used since it can withstand the tightening tension and pressure of the bolts (410, 415) which the one or more resilient members (325, 330) made of rubber cannot. Thus, by using such mechanism the chain guide (220) can effectively absorb the noise and vibrations of drive chain (220) and can be securely attached to the bracket (405) as well.
[00036] Figure 6 illustrates a perspective rear view of the chain guide (220) with the drive chain (215) disposed over it in accordance with an embodiment of the present subject matter. In an embodiment, the drive chain (215) is disposed over the elevated rail portion (305) and moves along its surface, whereas the guide space (310) given a free space to the drive chain (215) to move without providing a hindrance. The chain guide (220) is securely attached to the bracket (405) through the nut (420, 425) and bolt (410, 415) mechanism. Thus, as per the present subject matter the one or more resilient members (325, 330) are inserted in the one or more apertures (315, 320) in such a fashion that the first end (f, F’) having diameter D1 & D2 is located below the elevated rail potion (305) and the second end (S, S’) having diameter D1’ & D2’ is located below the guide space (310). This is assembled in such a fashion so that the first end (F, F’) having extra rubber material absorbs the extra noise and vibration being generated at the elevated rail portion (305) and the second end (S, S’) having comparatively less amount of rubber is located below the guide space (310).
[00037] Thus, the present subject matter provides a chain guide (220) used for supporting a drive chain (215). The chain guide (220) comprises of a one or more apertures (315, 320) in which a one or more resilient members (325, 330) are inserted. Furthermore, a one or more bushes (335, 340) are also inserted in the one or more resilient members (325, 330). Such an arrangement helps in an efficient absorption of noise and vibration caused due to the constant whipping and hitting between the drive chain (215) and chain guide (220).
[00038] It is to be understood that the aspects of the embodiments are not necessarily limited to the features described herein. Many modifications and variations of the present subject matter are possible in the light of above disclosure. Therefore, within the scope of claims of the present subject matter, the present disclosure may be practiced other than as specifically described.
,CLAIMS:We claim:
1. A transmission system (120) for a two-wheeled vehicle (100) comprising:
an internal combustion engine (110) enabled to provide required power to said vehicle (100);
a drive shaft (205) disposed on one side of said internal combustion engine (110) being rotated by power stroke of said internal combustion engine (110);
an output sprocket (175) mounted over said drive shaft (205) and rotating along with rotation of said drive shaft (205);
a rear wheel (115) with a wheel sprocket (180) connected to said output sprocket (175) through a drive chain (215); and
a chain guide (220) comprises a one or more apertures (315, 320) formed therein to receive a one or more resilient members (325, 330), and wherein said one or more resilient members (325, 330) is enabled to accommodate one or more bushes (335, 340).
2. The transmission system (120) as claimed in claim 1, wherein said chain guide (220) is attached to said vehicle (100) through a bracket (405) on which said chain guide (220) is securely attached through a pair of nuts (420, 425) and a pair of bolts (410, 415).
3. The transmission system (120) as claimed in claim 1, where said chain guide (220) comprises of an elevated rail (305) extending in direction of said drive chain (215) length to guide and support said drive chain (215) along which said drive chain (215) moves, and a guide space (310) to provide a free space for movement of said drive chain (215) without any hindrance.
4. The transmission system (120) as claimed in claim 1, wherein said one or more apertures (315, 320) comprises a first aperture (315) and a second aperture (320) formed beside each other in a down most portion of said chain guide (220) when seen from a front side of said vehicle (100).
5. The transmission system (120) as claimed in claim 1, wherein said one or more resilient members (325, 330) comprises a first resilient member (325) and a second resilient member (330) made of rubber with a frustum shaped profile having an uniform inner diameter (d1, d2) being accommodated in said first aperture (315) and said second aperture (320) respectively.
6. The transmission system (120) as claimed in claim 1, wherein said first resilient member (325) comprises a first end (F) with an outer diameter D1 and a second end (S) with an outer diameter D1’, and wherein said outer diameter D1 of said first end (F) is greater than outer diameter D1’ of second end (S).
7. The transmission system (120) as claimed in claim 1, wherein said second resilient member (330) comprises a first end (F’) with an outer diameter D2 and a second end (S’) with an outer diameter D2’, and wherein said outer diameter D2 of said first end (F’) is greater than outer diameter D2’ of said second end (S’).
8. The transmission system (120) as claimed in claim 1, wherein said one or more resilient members (325, 330) are inserted in said one or more apertures (315, 320) such that said first end (F, F’) is located below said elevated rail portion (305) and said second end (S, S’) is located below said guide space (310).
9. The transmission system (120) as claimed in claim 1, wherein said one or more bushes (335, 340) comprises of a cylindrical profile with a uniform diameter (d1’, d2’) which is equal to said inner diameter (d1, d2) of said one or more resilient members (325, 330).
10. The transmission system (120) as claimed in claim 1, wherein said pair of bolts (415, 420) are inserted through said one or more bushes (335, 340) to securely attach said chain guide (220) to said bracket (405).