DESC: TECHNICAL FIELD
[0001] The present disclosure relates to a saddle type vehicle. More particularly, the present invention relates to an improved cover assembly for a transmission system of the vehicle.
BACKGROUND OF THE INVENTION
[0002] In conventional vehicles, a prime mover comprises multiple components configured for serving propulsion functionality of the vehicle. The components of the vehicle typically entail high rotational speeds owing to operative frictional forces and centrifugal forces in serving the power and torque requirements of the vehicle. An undesirable consequence of high operating speeds and torque delivery of the prime mover is the issue of overheating of the components of the vehicle.
[0003] Overheating of the vehicle components may additionally be associated with malfunctions in the cooling system associated with the prime mover or a disruption in the energy conversion cycle of the prime mover. Therefore, there arises a need for air circulation and ventilation system operating in conjunction with the integrated cooling system in the prime mover which addresses anomalies in the vehicle operation concerning overheating. Generally, air cooling techniques are used for cooling the prime mover.
[0004] In scooter type vehicle, engines power is transmitted to the crank shaft to a clutch shaft with a Continuously Variable Transmission (CVT) assembly. The CVT assembly transfers the power and torque generated in the engine cranks shaft to the clutch shaft and thus to a rear wheel of the vehicle. Generally, this function is achieved by centrifugal clutch in the driven mechanism mounted on the clutch shaft. The Centrifugal clutch generates heat during operation this heat need to be taken away from the belt room to maintain the optimum temperature in the zone. To withstand the clutch temperature and covering and providing inlet and outlet to the air to cool and take away the heat generated during clutch operation. Generally, cooling is done through a forced air-cooling system, fan is fitted or in built in the face fixed drive of the CVT drive mechanism.
[0005] Along with the prime mover, other vehicle components such as the transmission system may also comprise high temperature zones. The transmission system comprises a clutch assembly configured to engage and disengage the power transmission between the prime mover and the gear box of the vehicle. The clutch assembly is observed to have high temperature zones which permeate externally to a transmission cover or CVT cover. The clutch components are subjected to high rotational speeds and acting frictional forces making the clutch assembly a high temperature zone. The transmission cover being subjected to high temperature ranges deforms the conventional transmission cover design. Inclusion of additional cooling systems integrated with the transmission cover not only increases the complexity of the transmission assembly but also increases manufacturing complexity. In addition, in the existing transmission cover or the cover variator, there is a scope to improve the air flow towards the clutch driven area ensuring optimum cooling of the heated components. Thus, there arises a need for a cover design for vehicle components, such as clutch assembly and transmission system, subjected to overheating with ventilation systems intrinsic to its operationality.
[0006] Furthermore, conventional transmission covers, or CVT covers, are typically constructed entirely from metal due to its durability and protective qualities. However, this metallic transmission cover significantly contributes to the overall weight of the vehicle, as metal is heavier. The increased weight not only affects the vehicle's fuel efficiency, requiring more energy to move, but also raises production and maintenance costs. Consequently, while metal covers offer protection for the transmission system, they also lead to higher vehicle weight and increased costs, prompting manufacturers to explore lighter and cost-effective transmission covers.
[0007] Therefore, there is a need of a simple and cost-effective solution which can obviates the above-mentioned problems.
SUMMARY OF THE INVENTION
[0008] The present disclosure discloses a saddle type vehicle. More particularly, the present invention relates to an improved and cost-efficient cover assembly for a transmission system such as Continuously Variable Transmission (CVT) system of a saddle-type vehicle.
[0009] In accordance with an embodiment, the cover assembly for the CVT system, comprises at least on first cover portion configured to cover at least a first region of the CVT system, and at least one second cover portion coupled to the first cover portion, the second cover portion being configured to cover at least a second region of the CVT system. The first cover portion comprises one or more airflow guides.
[0010] In an embodiment, the first cover portion is made of a material different from the material of the second cover portion. The first cover portion is made of polymer and the second cover portion is made of aluminium.
[0011] In an embodiment, the cover assembly comprises an inner air guide member configured with at least one of the first cover portion and the second cover portion. The inner air guide member is configured to guide air flow towards the second region of the CVT system. In an addition, a gap is maintained between the inner air guide member and the first cover portion.
[0012] In an embodiment, the inner air guide member comprises a hole to receive air from the first cover portion, and a cover wall portion to cover at least a portion of an inner surface of the first cover portion.
[0013] In an embodiment, the inner air guide member comprises at least one first air guide wall, the air guide wall being protruded from the cover wall portion and faces the CVT system. The first air guide wall is configured around at least a portion of the hole.
[0014] In an embodiment, the inner air guide member comprises at least one second air guide wall, the second air guide wall being protruded from a side of the cover wall portion opposite to the side of the first air guide wall and faces the inner surface of the first cover portion.
[0015] In an embodiment, the first cover portion comprises an air inlet duct to receive and direct ambient air into the cover assembly for cooling the continuously variable transmission.
[0016] In an embodiment, the first cover portion comprises one or more air guides to guide air received through the inlet duct.
[0017] In an embodiment, the first cover portion comprises a first flange, the first flange being configured to be sealably attached to a second flange of the second cover portion.
[0018] In an embodiment, the first cover portion comprises through hole for receiving connecting shaft of a kick starter mechanism. The first cover portion is configured to accommodate components of the kick starter mechanism of the saddle-type vehicle.
[0019] In an embodiment, the second cover portion comprises an air outlet.
[0020] In an embodiment, the first cover portion and the second cover portion being attached to a casing of the continuous variable transmission.
[0021] 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.
[0022] Further, it is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The present invention is described with reference to figures. This invention is implementable in two-wheeled, three wheeled and four wheeled vehicles. Non-limiting and non-exhaustive embodiments of the present embodiments are described with reference to the following figures, wherein like reference numerals refer to like parts throughout the various views unless otherwise specified.
[0024] Figure 1 illustrates a saddle-type vehicle with a cover assembly for a transmission system of the saddle-type vehicle, in accordance with an embodiment of the invention.
[0025] Figure 2 illustrates a side view of the cover assembly covering a transmission system of the saddle-type vehicle, in accordance with an alternative embodiment of the invention.
[0026] Figure 3 illustrates a sectional view of the cover assembly covering the transmission system of the saddle-type vehicle, in accordance with an alternative embodiment of the invention.
[0027] Figure 4 illustrates an inner side view of the cover assembly, in accordance with an alternative embodiment of the invention.
[0028] Figure 5 illustrates an exploded view of the cover assembly, in accordance with an embodiment of the invention.
[0029] Figure 6 illustrates a side view of a cover assembly with a kick starter mechanism, in accordance with an embodiment of the invention.
[0030] Figure 7 illustrates an exploded view of a cover assembly with a kick starter mechanism, in accordance with an embodiment of the invention.
[0031] Figure 8A illustrates an inner side view of an inner air guide member, in accordance with an embodiment of the invention.
[0032] Figure 8B illustrates an outer side view of the inner air guide member, in accordance with an embodiment of the invention.
[0033] Figure 9A illustrates an inner side view of a cover assembly having single outer cover and an inner air guide member, in accordance with another embodiment of the invention.
[0034] Figure 9B illustrates an exploded view of a cover assembly having single outer cover, the inner air guide member with a kick starter mechanism, in accordance with another embodiment of the invention.
DETAILED DESCRIPTION
[0035] In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. One skilled in the relevant art will recognize, however, that the techniques described herein can be practised without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring certain aspects.
[0036] Various features and embodiments of the present disclosure here will be discernible from the following further description thereof, set out hereunder. 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 vehicle and looking forward. However, it is contemplated that the disclosure in the present disclosure may be applied to any vehicle without defeating the spirit of the present subject matter. The detailed explanation of the constitution of parts other than the present disclosure which constitutes an essential part has been omitted at suitable places.
[0037] The present subject matter is further described with reference to the accompanying figures. It should be noted that the description and figures merely illustrate the principles of the present subject matter. Various arrangements may be devised that, although not explicitly described or shown herein, encompass the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects and examples of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.
[0038] Further, various embodiments disclosed herein are to be taken in the illustrative and explanatory sense, and would in no way be construed as limiting the present disclosure. All joinder references (e.g., attached, affixed, coupled, connected, etc.) are only used to aid the reader’s understanding of the present disclosure, and may not create limitations, particularly as to the position orientation, or use of the system and/or methods disclosed herein. Therefore, joinder references, if any, are to be construed broadly. Moreover, such joinder references do not necessarily infer that two elements are directly connected to each other.
[0039] Additionally, all numerical terms, such as, but not limited to, “first”, “second”, “primary”, “secondary”, “main” or any other ordinary and/or numerical terms, should also be taken as identifiers, to assist the reader’s understanding of the various elements, embodiments, variations and/or modifications of the present disclosure, and may not create any limitations, particularly as to the order, or preference, of any element, embodiment, variation, and/or modification relative to, or over, another element, embodiment, variation and/or modification.
[0040] It will also be appreciated that one or more of the elements depicted in the drawings/ figures can also be implemented in a more separated or integrated manner, or even removed, or rendered as inoperable in certain cases, as is useful in accordance with a particular application. The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. However, the disclosed invention is not limited to the present embodiments.
[0041] Embodiments of the present disclosure explained herein relate to a cover assembly for a transmission system, such as a CVT system, of a vehicle.
[0042] In accordance with an embodiment of the present disclosure, the proposed cover assembly includes two parts, a first cover portion, which is on front side, and a second cover portion which is at a rear side. The first cover portion is configured to cover a drive zone of the CVT, and has an inlet for air entry. The first cover portion is made of plastic material as it is configured at lower temperature zone. The second cover portion, which is at rear side, is configured to cover driven zone of the CVT. The second cover portion is made of aluminium material as it is configured at higher temperature zone. The different material for the two parts of the cover assembly help in parts weight reduction and cost reduction of the vehicle. For instance, different material for the two parts of the cover assembly can provide the benefit of part weight savings up to 60% and cost savings up to 40% with respect to conventional transmission cover which is made of aluminium.
[0043] At least one of the first cover portion and the second cover portion is provided with air flow guides and/or guide walls to divert the air flow towards the fan central area and towards the driven zone of the CVT, which will reduce the air flow stagnation, improve mass air flow and improves cooling.
[0044] Thus, the proposed cover assembly also facilitates in improvement in the air-cooling of the CVT zones. The improvement in the air cooling is achieved by optimising the air flow path by providing air flow guides, guide walls and covering the air stagnation zones and improving the mass air flow rate of the cooling system. The air flow from the fan is diverted and guided by an inner air guide member/fan cover to cool the clutch on driven zone of the CVT by maximum heat removal by improving the mass air flow.
[0045] Referring to Figure 1 to Figure 5, in accordance with an embodiment, the present discloses a cover assembly (100) for a continuously variable transmission (CVT) system (150) of a saddle-type vehicle (175), such as but not limited to a scooter type vehicle. As shown in FIG. 3, in the saddle-type vehicle (also, hereinafter referred to simply as vehicle 175), the power and torque generated by an engine (151) are initially transferred from the engine's crankshaft to a clutch shaft. This is facilitated by a belt and pulley mechanism (152) of the CVT system (150), which continuously adjusts the gear ratio for optimal performance. In addition, a centrifugal clutch (153) is mounted on a clutch shaft (154), engages automatically when the engine reaches a certain RPM, using centrifugal force to connect the engine to the transmission system. Once engaged, the clutch transfers the power and torque to the driven mechanism, which then transmits this power to a rear wheel (155) of the vehicle. This entire process ensures that the power transfer is smooth and efficient, allowing for seamless acceleration and a comfortable riding experience. During operation, the centrifugal clutch (153) generates heat due to friction, which must be managed to maintain optimal function of the CVT system (175). To dissipate this heat, a forced air-cooling system is used, including a cooling fan (156) configured with the CVT drive mechanism. This fan (156) circulates air for cooling the components and removing the heat generated during operation of the vehicle (175).
[0046] In an embodiment, the cover assembly (100) comprises at least on first cover portion (101) and at least one second cover portion (102) coupled to the first cover portion (101). The first cover portion (101), which is configured towards a front region (F) of the CVT system (150), is adapted to cover at least a first region of the CVT system (150), for instance the first region, which is the front region (F) of the CVT system (150), corresponds to a drive zone of the CVT system (150). The second cover portion (102) is configured to cover at least a second region of the CVT system (150), for instance the second region, which is the rear region (R) of the CVT system (150), corresponds to a driven zone of the CVT system. In another words, the first region of the CVT system (150) corresponds to a drive zone of the CVT system (175) configured towards a front region (F) of the saddle-type vehicle (175), and the second region of the CVT system (150) corresponds to a driven zone of the CVT system (100) configured towards a rear region (R) of the saddle-type vehicle (175). The first cover portion (101) and the second cover portion (102) are configured longitudinally along a front-rear direction of the vehicle (175).
[0047] In an embodiment, the first cover portion (101) and the second cover portion (102) are attached to a casing (110) of the continuous variable transmission (150) through fasteners such as but not limited to screws.
[0048] In an embodiment, the first cover portion (101) is made of a material different from the material of the second cover portion (102). The first cover portion (101) can made of polymer, such as but not limited to plastic. The second cover portion (102) can be made of a metallic material such as but not limited to aluminium.
[0049] In an embodiment, the first cover portion (101) comprises a first flange (117) and the second cover portion (102) comprises a second flange (118). For instance, the first flange (117) and the second flange (118) are having complementary profile. The first flange (117) of the first cover portion (101) is detachably and sealably attached to the second flange (118) of the second cover portion (102) through a seal member (106) and/or other suitable coupling arrangements. Thus, the two parts, the first cover portion (101) and the second cover portion (102), are joined with the seal member (106) to avoid any leak or rattling noise during operating conditions of the vehicle. The seal member (106) can be made of is made of a flexible material, such as rubber or foam elastomer, although other materials with similar properties may also be utilized to accommodate various application requirements and environmental conditions.
[0050] In an embodiment, the cover assembly (100) further includes an inner air guide member (103) configured with at least one of the first cover portion (101) and the second cover portion (102). The inner air guide member (103) is configured to guide air flow towards the second region/driven of the CVT system (150). The inner air guide member (103) is configured with the first cover portion (101) such that a gap can be maintained between the inner air guide member (103) and the first cover portion (101).
[0051] In an embodiment, the first cover portion (101) comprises one or more airflow guides (113). The airflow guides (113) are extended from an inner surface of the first cover portion (101), the inner surface of the first cover portion (101) is facing towards the driven region of CVT system (150). Further, the first cover portion (101) comprises an air inlet duct (107) on the front region. The air inlet duct (107) is configured to receive and direct ambient air into the cover assembly (100) for cooling the continuously variable transmission (150). An air bellow (104) having one end attached to the air inlet duct (107) of the first cover portion (101) via a coupling unit (111) which can include a clamp and a fastener. Other end of the air bellow (104) can be attached to an air filter of the vehicle (175). The airflow guides (113) are configured to guide air received through the air inlet duct (107). The air guides (113) can be one or more depending on the cooling requirements of the continuously variable transmission (150) and the vehicle (175).
[0052] Referring to FIG. 3 to FIG. 9, in an embodiment, the inner air guide member (103) comprises a hole (105), such as an inlet hole to receive air from the first cover portion (101), and a cover wall portion (108) to cover at least a portion of an inner surface of the first cover portion (101). The cover wall portion (108) can be extended over the first cover portion (101) and the second cover portion (102). The hole (105) faces the cooling fan (156) of the continuously variable transmission system, the fan sucks the air, received via the air inlet duct (107), through the hole (105) and circulate inside the cover assembly (100). The cover wall portion (108) of the inner air guide member (103) is configured to guide the air flow towards the driven zone of the CVT system (150). In addition, the cover wall portion (108) or the inner air guide member (103) is configured to cover the non-functional surfaces and/or volumes in at least one of the first cover portion (101) and the second cover portion (102), otherwise these non-functional surfaces and/or volumes form air stagnation zones and affect the components cooling. Thus, the cover wall portion (108) or the inner air guide member (103) covers the air stagnation zones in the cover assembly (100), thereby improving the mass air flow rate towards the second zone/driven zone of the CVT system (150) and improve the cooling of the CVT system (150).
[0053] In an embodiment, the inner air guide member (103) further comprises at least one first air guide wall (115). The first air guide wall (115) is protruded from the cover wall portion (108) and faces the CVT system (150). The first air guide wall (115) is configured around at least a portion of the hole (105). In addition, the first air guide wall (115) can be extended along the length of the cover wall portion (108), as shown in FIG. 7.
[0054] In an embodiment, the first air guide wall (115) can be formed as a volute profile wall partially around the cooling fan (156) of the forced air cooling system to guide the air flow towards the centrifugal clutch or CVT’s driven region to cool the parts. In addition, the first air guide wall (115) diverts the air flow towards the fan (156), thereby reducing the air flow stagnation and improve mass air flow towards the second/driven region of the CVT system (150.) In an embodiment, the first air guide wall (115) can be one or more depending upon the requirements.
[0055] In an embodiment, the inner air guide member (103) comprises at least one second air guide wall (116), the second air guide wall (116) being protruded from a side of the cover wall portion (108) opposite to the side of the first air guide wall (115) and faces the inner surface of the first cover portion (101). The second air guide wall (116) is configured to overlap with the airflow guides (113) of the first cover portion (101) to minimise the air leak between the first cover portion (101) and the inner air guide member (103). The second air guide wall (116) can have profile complementary to the airflow guide (113). The second air guide wall (116) can be one or more depending upon the requirements.
[0056] Thus, the geometry and shape of the inner air guide member (103) including the hole (105), the cover wall portion (108), the first air guide wall (115) and the second air guide wall (116) improves cooling of the CVT system (150) by optimising the air flow in the cover assembly by guiding air flow towards the second region of the CVT, covering the air stagnation zones of the first and second cover portions (101, 102) and improving the mass air flow rate to cool the CVT system (150). The air flow from the fan (156) is diverted and guided by the inner air guide member (103) to cool the clutch (153) (CVT driven) by maximum heat removal by improving the mass air flow.
[0057] In an embodiment, the inner air guide member (103) is mounted to the first cover portion (101) through mounting screws (122). The inner air guide member (103) includes first mounting bosses (123) and the first cover portion (101) comprises second mounting bosses (124). The first mounting bosses (123) and the second mounting bosses (124) are configured to enable engagement between the inner air guide member (103) and the first cover portion (101) through mounting screws (122).
[0058] In an embodiment, the second cover portion (102) comprises an air outlet (109). The air outlet (109) is located at rear end of the second cover portion (102). The air introduced through the inlet duct (107) is circulated in the cover assembly (100) and further the air cool the CVT system and take away the heat generated during clutch operation. Further, the air in the cover assembly (100), which get heated exit the cover assembly (100) through the air outlet (109) of the second cover portion (102). The air outlet (109) can be an outlet duct extended from the rear end of the second cover portion (102).
[0059] In an embodiment, the second cover portion (102) comprises a cavity (126) to receive a bearing for supporting the clutch shaft (154).
[0060] In an embodiment, as shown in FIG. 6 and FIG. 7, the first cover portion (101) comprises through hole (119) for receiving a connecting shaft (120) of a kick starter mechanism (121). The first cover portion (101) can include one or more inner cavities on the inner surface, facing the CVT system (150) to accommodate components of the kick starter mechanism (121) of the saddle-type vehicle (175). A kick leaver (127) of the kick starter mechanism (121) is connected to the connecting shaft (120) from the outside of the first cover portion (101).
[0061] Referring to FIG. 9A and FIG.9B, where Fig 9A illustrates an inner side view of a cover assembly (100) having single outer cover and an inner air guide member, in accordance with another embodiment of the invention. Figure 9B illustrates an exploded view of a cover assembly (100) having single outer cover and the inner air guide member with a kick starter mechanism, in accordance with another embodiment of the invention. In an embodiment, the first cover portion (101) and the second cover portion (102) can be an integral single part. In an embodiment, the cover assembly (100), i.e., the first cover portion (101) and the second cover portion (102), can be made of aluminum.
[0062] In an embodiment, air flow in the cover assembly (100) having single outer cover part which is made of the first cover portion (101) and the second cover portion (102), can be improved by avoiding air stagnation zones by covering such zones through the inner air guide member (103) and guiding the air towards the clutch driven area by providing the airflow guides (113), the first air guide wall (115) and the second air guide wall (116).
[0063] In an embodiment, the cover assembly (100) i.e., the first cover portion (101) and the second cover portion (102), can be made of a suitable polymer which can withstand high heat generated during operation of the CVT system (150).
[0064] Thus, the present invention provides a cover assembly for a continuously variable transmission (CVT) system of a saddle-type vehicle, which can overcomes the drawbacks of the exiting cover assembly by reducing weight and cost of the cover assembly. The cover assembly also improve air flow of the forced air cooling mechanism of the vehicle and reduces temperature of the CVT’s hot components. A first cover portion of the cover assembly is made of plastic material as it is configured at lower temperature zone and a second cover portion is made of aluminium material as it is configured at higher temperature zone. The different material for the two parts of the cover assembly help in parts weight reduction and cost reduction. Thus, the first cover portion is made with plastic material which will give the benefit of less part weight and less cost compared to the existing cover which is complete single part made of aluminium.
[0065] In addition, the first cover portion is provided with first air flow guides to divert the air flow towards the fan area which will reduce the air flow stagnation and improve mass air flow towards the second cover portion, i.e., towards the clutch driven area (CVT driven zone) to for efficient cooling. In addition, the air guided increases air flow to reduce the operating temperature so that the plastic material can withstand the operating temperature. The improvements made in the air flow corresponds to ~20°C of temperature drop in the surrounding parts.
[0066] As the first cover portion and the second cover portion are joined with the seal member, such as rubber or foam elastomers, in between, this avoids any leak or rattling noise during operating conditions.
[0067] In addition, the inner air guide member is also provided with guide walls to overlap with the air flow guides in the first cover portion to minimise the air leak in the flow path. The inner air guide member is provided with a volute profile air guide wall to guide the air flow towards the second cover portion, i.e., towards the clutch driven area (CVT driven) area to for cooling the CVT system. A cover wall portion/base wall of the inner air guide member is extended to guide the air flow and also to cover the non-functional volumes in first and second cover portions to prevent air stagnation zones and to improve the parts cooling of the CVT system. In an exemplary embodiment, the inner air guide member improvs the air flow by 68% (3.1 g/s to 5.2g/s) and due to air flow improvement temperature reduction in the belt room approximately by 12°C. This will indirectly help in improve the delt durability and engine temperature reduction of the vehicle.
[0068] Thus, splitting of cover assembly into two parts one with plastic part and other with aluminium to reduce part weight and cost. The air guides provided on the cover portions and the inner air guide member increase the air flow towards the rear side, or hot zone of the CVT system, resulting in improvement in the air-cooling system of CVT transmission zones. The improvement in the air cooling is achieved by optimising the air flow path by providing air flow guides on the cover portions and the mating cover member and covering the air stagnation zones and improving the mass air flow rate to the cooling system. The air flow from the fan is diverted and guided by the inner air guide member to cool the Clutch (CVT driven) by maximum heat removal by improving the air flow. The geometry and shape of the inner air guide member is very critical and optimised by analysis to minimise the air recirculation and stagnation and effectively improving the air flow to maximum extent.
[0069] Therefore, the present disclosure provides the cover assembly with a compact CVT cooling arrangement for the vehicle. The present disclosure improves air flow towards the CVT driven area where high heat is generated and optimum utilisation of air flow. In addition, engine clutch belt room temperature can be reduced which can also affect partially for the engine oil temperature and belt durability improved due to low operating temperature. The present disclosure also facilitates part cost reduction and part weight reduction of the cover assembly.
[0070] In the foregoing specification, the disclosure has been described with reference to specific embodiments disclosed herein can be modified or otherwise implemented in various other ways without departing from the spirit and scope of the disclosure. Accordingly, this description is to be considered illustrative and is for the purpose of teaching those skilled in the art the manner of making and using various embodiments of the disclosure. It is to be understood that the forms of the disclosure herein shown and described are to be taken as representative embodiments. Equivalent elements, materials processed or steps may be substituted for those representatively illustrated and described herein. Moreover, certain features of the disclosure may be utilized independently of the use of other features, all as would be apparent to one skilled in the art after having the benefit of this description of the disclosure. Expressions such as “including”, “comprising”, “incorporating”, “consisting of”, “have”, and “is”, used to describe and claim the present disclosure are intended to be construed in a non-exclusive manner, namely allowing for items, components, or elements not explicitly described also to be present. Reference to the singular is also to be construed to relate to the plural.
[0071] This written description uses examples to provide details on the disclosure, including the best mode, and also to enable any person skilled in the art to practice the disclosure, including making and using any devices or systems and performing any incorporated methods. ,CLAIMS:WE CLAIM:

1. A cover assembly (100) for a transmission system (150) of a saddle-type vehicle (175), the cover assembly (100) comprising:
at least one first cover portion (101) configured to cover at least a first region of the transmission system (150); and
at least one second cover portion (102) coupled to the at least one first cover portion (101), the at least one second cover portion (102) being configured to cover at least a second region of the transmission system (150);
wherein the at least one first cover portion (101) comprises one or more airflow guides (113).

2. The cover assembly (100) as claimed in claim 1, wherein the at least one first cover portion (101) being made of a material different from the material of the at least one second cover portion (102), and wherein the at least one first cover portion (101) being made of polymer and the at least one second cover portion (102) being made of a metallic material.

3. The cover assembly (100) as claimed in claim 1, comprising an inner air guide member (103) configured with at least one of the first cover portion (101) and the second cover portion (102), the inner air guide member (103) being configured to guide air flow towards the second region of the transmission system (150), and wherein a gap is maintained between the inner air guide member (103) and the first cover portion (101).

4. The cover assembly (100) as claimed in claim 3, wherein the inner air guide member (103) comprising:
a hole (105); and
a cover wall portion (108) to cover at least a portion of an inner surface of the first cover portion (101).

5. The cover assembly (100) as claimed in claim 4, wherein the inner air guide member (103) comprises at least one first air guide wall (115), the first air guide wall (115) being protruded from the cover wall portion (108) and faces the transmission system (150), and wherein the first air guide wall (115) being configured around at least a portion of the hole (105).

6. The cover assembly (100) as claimed in claim 5, wherein the inner air guide member (103) comprises at least one second air guide wall (116), the second air guide wall (116) being protruded from a side of the cover wall portion (108) opposite to the side of the first air guide wall (115) and faces the inner surface of the first cover portion (101), and wherein the second air guide wall (116) being configured to overlap with the airflow guides (113) of the first cover portion (101) to minimise the air leak between the first cover portion (101) and the inner air guide member (103).

7. The cover assembly (100) as claimed in claim 1, wherein the first cover portion (101) comprises an air inlet duct (107) to receive and direct ambient air into the cover assembly (100) for cooling the transmission system (150).

8. The cover assembly (100) as claimed in claim 7, wherein the first cover portion (101) comprises one or more air guides (113) to guide air received through the inlet duct (107).

9. The cover assembly (100) as claimed in claim 1, wherein the first cover portion (101) comprises a first flange (117), the first flange (117) being configured to be sealably attached to a second flange (118) of the second cover portion (102).

10. The cover assembly (100) as claimed in claim 1, wherein the first cover portion (101) comprises through hole (119) for receiving a connecting shaft (120) of a kick starter mechanism (121), and the first cover portion (101) being configured to accommodate components of the kick starter mechanism (121) of the saddle-type vehicle (175).

11. The cover assembly (100) as claimed in claim 3, wherein the second cover portion (102) comprises an air outlet (109).

12. The cover assembly (100) as claimed in claim 1, wherein the first cover portion (101) and the second cover portion (102) being attached to a casing (110) of the transmission system (150), wherein the first region of the transmission system (150) corresponds to a drive zone of the transmission system (175) and is configured towards a front region of the saddle-type vehicle (175), and wherein the second region of the transmission system (150) corresponds to a driven zone of the transmission system (100) and is configured towards a rear region of the saddle-type vehicle (175).