Driven wheel assembly and vehicle

Abstract

This application provides a driven wheel assembly and a vehicle. The driven wheel assembly includes: a first driven wheel, a second driven wheel, a first elastic element, and a buffer assembly. The first driven wheel has a connecting shaft protruding from it, and a cam cover with a cam groove is provided at the end of the connecting shaft. The second driven wheel is sleeved on the connecting shaft and has a limiting protrusion that contacts the cam groove. The two ends of the first elastic element are connected to the second driven wheel and the cam cover, respectively. The buffer assembly includes a buffer slider, a first elastic element, and a second elastic element. The buffer slider has a first protrusion and a second protrusion. The two ends of the second elastic element are connected to the limiting protrusion and the first protrusion, respectively, and the second elastic element pushes the limiting protrusion to abut against the cam groove. The two ends of the third elastic element are connected to the second driven wheel and the second protrusion, respectively, and the third elastic element pushes the second protrusion to abut against the cam groove. The driven wheel assembly and vehicle provided by this application can solve the problem of abnormal noise on the cam cover.

Description

Technical Field

[0001] This invention relates to the field of speed reducer structure design technology, and more particularly to a driven wheel assembly, and also to a vehicle. Background Technology

[0002] Continuously variable transmission (CVT) is a widely used transmission mechanism with advantages such as smooth gear ratio changes, no jerking, excellent driving performance, and significant fuel savings. It is mainly used in motor vehicles such as automobiles, motorcycles, and all-terrain vehicles.

[0003] In order to ensure the vehicle's normal downhill braking function, the continuously variable transmission (CVT) system in the prior art uses a preload force generated by the driven wheel springs connected to the first and second driven wheels on the CVT driven wheel assembly to ensure that the two wheels are always clamped to the belt set between the second and first driven wheels.

[0004] The second driven wheel is equipped with a limit protrusion, and the first driven wheel is equipped with a cam disc. During downhill braking, as the vehicle accelerates or decelerates, the limit protrusion will collide with the cam disc, causing abnormal noise and disturbing the occupants, thus affecting the comfort and safety of the entire vehicle. Summary of the Invention

[0005] In view of this, this application provides a driven wheel assembly and a vehicle to solve the problem of abnormal noise during acceleration or deceleration of the driven wheel assembly during downhill braking in the prior art.

[0006] This application provides a driven wheel assembly, which is connected to a driving wheel assembly via a belt. The driven wheel assembly includes: a first driven wheel, a second driven wheel, a first elastic element, and a buffer assembly. A connecting shaft is provided on the first driven wheel, and a cam cover is provided at the end of the connecting shaft away from the first driven wheel. The cam cover is provided with a cam groove facing the first driven wheel.

[0007] The second driven wheel is sleeved on the connecting shaft and is located between the first driven wheel and the cam cover. A limiting protrusion that contacts the cam groove is provided on the side of the second driven wheel near the cam cover.

[0008] One end of the first elastic element is connected to the second driven wheel, and the other end of the first elastic element is connected to the cam cover;

[0009] The buffer assembly includes a buffer slider, a second elastic element and a third elastic element. The buffer slider is disposed between the second driven wheel and the cam cover and extends with a first protrusion and a second protrusion.

[0010] The two ends of the second elastic member are respectively connected to the limiting protrusion and the first protrusion;

[0011] The two ends of the third elastic element are respectively connected to the second driven wheel and the second protrusion.

[0012] In one possible design, the buffer assembly further includes a buffer fixing member, which is fixed to the side of the second driven wheel near the cam cover. The side of the buffer fixing member near the cam groove is provided with a limiting groove. The third elastic member is located in the limiting groove, and one end of the third elastic member is connected to the second driven wheel through the buffer fixing member. The other end of the third elastic member pushes the second protrusion to move in the limiting groove until the second protrusion contacts the cam groove.

[0013] In one possible design, the buffer assembly further includes a retaining cover plate that covers the limiting groove and is used to confine the third elastic element within the limiting groove.

[0014] In one possible design, the driven wheel assembly includes multiple sets of buffer components, which are evenly distributed along the circumference of the second driven wheel and fixed to the annular component. The cam cover is provided with multiple cam grooves corresponding to the position and number of the buffer components, and the side of the second driven wheel near the cam cover is provided with a limiting protrusion corresponding to the cam groove.

[0015] In one possible design, the cam cover is provided with a structural sidewall extending in the axial direction of the connecting shaft, the cam groove is provided on the structural sidewall and the opening faces the second driven wheel, the cam groove includes a first contact surface and a second contact surface that are transitionally connected, when the distance between the first driven wheel and the second driven wheel changes, the second protrusion moves along the first contact surface, and the limiting protrusion moves along the second contact surface.

[0016] In one possible design, a buffer block is provided on the side of the limiting protrusion near the cam groove.

[0017] In one possible design, the buffer block and the buffer slider are nylon blocks.

[0018] In one possible design, the buffer block is detachably connected to the limiting protrusion.

[0019] In one possible design, the first elastic element is a pressure torsion spring sleeved on the connecting shaft, and the first elastic element is used to push the second driven wheel closer to the first driven wheel.

[0020] This application also provides a vehicle that utilizes the driven wheel assembly described in any of the preceding claims. Therefore, it obviously possesses the advantages of the aforementioned driven wheel assembly, thereby improving the comfort and safety of the vehicle.

[0021] The driven wheel assembly and vehicle provided in this application have at least the following advantages:

[0022] When the distance between the first driven wheel and the second driven wheel in the driven wheel assembly changes, the second protrusion and the limiting protrusion always abut against the cam groove, thereby preventing the second protrusion, the limiting protrusion and the cam groove from colliding and producing abnormal noise when the driven wheel assembly accelerates or decelerates during downhill braking, thus improving the safety and comfort of the driven wheel assembly during use.

[0023] Other features and advantages of the embodiments of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the embodiments of this application. The objects and other advantages of the embodiments of this application are realized and obtained in accordance with the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a structural diagram of a conventional CVT system;

[0026] Figure 2 An exploded view of the driven wheel assembly provided in the embodiments of this application;

[0027] Figure 3 A cross-sectional view of the driven wheel assembly provided in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the driven wheel assembly with the buffer fixing member removed, provided in an embodiment of this application.

[0029] Figure 5 This is a schematic diagram of the driven wheel assembly provided in an embodiment of this application;

[0030] Figure 6 for Figure 5 A schematic diagram of the structure with the buffer fastener removed;

[0031] Figure 7 A schematic diagram showing the connection between the limiting protrusion and the second elastic element provided in an embodiment of this application;

[0032] Figure 8 This is a schematic diagram of the assembly of the driven wheel assembly provided in an embodiment of this application;

[0033] Figure 9 An exploded view of the buffer fastener provided in the embodiments of this application;

[0034] Figure 10 This is a schematic diagram illustrating the assembly of the second elastic element and the first protrusion according to an embodiment of this application.

[0035] Figure 11 This is a schematic diagram of the structure of the cam cover provided in an embodiment of this application;

[0036] Figure 12 This is a structural schematic diagram of the cam cover provided in an embodiment of this application from another perspective.

[0037] Figure label:

[0038] 100. Driven wheel assembly;

[0039] 200. Belt;

[0040] 300. Drive wheel assembly;

[0041] 310. Proactive positioning;

[0042] 320. Active trading;

[0043] 330. First V-groove;

[0044] 1. First driven wheel;

[0045] 11. Connecting shaft;

[0046] 12. Cam cover;

[0047] 121. Cam groove;

[0048] 121a, First contact surface;

[0049] 121b, Second contact surface;

[0050] 122. Structural sidewalls;

[0051] 123. Bottom of the trough;

[0052] 124. Slot opening;

[0053] 2. Second driven wheel;

[0054] 21. Limiting protrusion;

[0055] 211. Buffer block;

[0056] 3. First elastic element;

[0057] 4. Buffer components;

[0058] 41. Buffer slider;

[0059] 411. First protrusion;

[0060] 412. Second protrusion;

[0061] 42. Second elastic element;

[0062] 43. The third elastic element;

[0063] 44. Buffer fasteners;

[0064] 441. Limiting groove;

[0065] 44a. First fastener;

[0066] 44b. Second fastener;

[0067] 45. Fixture cover plate;

[0068] 46. ​​Ring-shaped component;

[0069] 5. Second V-groove.

[0070] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0071] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0072] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0073] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0074] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0075] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0076] The following describes a specific embodiment of the driven wheel assembly provided in the embodiments of this application.

[0077] CVT stands for Continuously Variable Transmission, a type of automotive transmission. Figure 1 A CVT assembly is shown, which includes a driven pulley assembly 100, a belt 200, and a drive pulley assembly 300. The drive pulley assembly 300 is connected to the crankshaft of the engine, and the belt 200 is disposed between the driven pulley assembly 100 and the drive pulley assembly 300 and is used to transmit power.

[0078] In this embodiment, the drive wheel assembly 300 includes a drive stationary disc 310 and a drive moving disc 320, and the conical surfaces of the drive stationary disc 310 and the drive moving disc 320 form a first V-groove 330; the driven wheel assembly 100 includes a driven stationary disc and a driven moving disc, and the conical surfaces of the driven stationary disc and the driven moving disc form a second V-groove 5; the belt 200 is a V-belt 200, and the belt 200 connects the first V-groove 330 and the second V-groove 5.

[0079] The drive plate 320 may be equipped with a centrifugal assembly for pushing the drive plate 320 to move axially along the crankshaft. This assembly causes the drive plate 320 to move away from the drive plate 310 at low speeds and closer to the drive plate 310 at high speeds. Specifically, the centrifugal assembly may include a centrifugal component. The driven plate is equipped with a slider and a thrust spring for pushing the driven plate to move axially. When the CVT is working, the working radius of the tapered surface of the driven wheel assembly 100 engaging with the belt 200 is changed by the axial movement of the drive plate 320 of the drive wheel assembly 300 and the driven plate of the driven wheel assembly 100, thereby changing the transmission ratio.

[0080] When the engine is idling, the gap between the drive plate 310 and the drive plate 320 of the drive pulley assembly 300 is greater than the width of the belt 200. The drive plate 310 and the drive plate 320 will not exert a squeezing friction on the belt 200. At this time, the belt 200 does not transmit force, and the vehicle is in a parked state. As the engine speed increases, the speed of the drive pulley assembly 300 also increases. At this time, under the action of the centrifugal component, the drive disc 320 moves closer to the drive fixed disc 310, thereby generating a squeezing friction force on the belt 200. This causes the belt 200 to rotate with the drive pulley assembly 300, driving the driven pulley assembly 100 to rotate. During the operation of the belt 200, as the speed increases, the drive fixed disc 310 and the drive disc 320 squeeze the belt 200, causing the belt 200 at the drive pulley assembly 300 to move towards the outer ring of the disc, and the belt 200 at the driven pulley assembly 100 to move towards the inner ring of the disc. At this time, the belt 200 squeezes the driven disc of the driven pulley assembly 100. Under the action of the slider and the thrust spring, the driven disc moves away from the driven fixed disc.

[0081] When the vehicle is going downhill and the engine speed is lower than the engagement speed of the CVT system, the drive pulley assembly 300 no longer compresses the belt 200, and the driven pulley assembly 100 does not tend to rotate with the drive pulley assembly 300.

[0082] In non-downhill braking conditions, the drive wheel assembly 300 drives the driven wheel assembly 100 to rotate through the belt 200, thereby transmitting force. In the CVT system, the drive wheel assembly 300 is the driving force.

[0083] During downhill braking, as the vehicle speed gradually increases, the rotational speed of the driven pulley assembly 100, indirectly connected to the wheel hubs, also increases. In the CVT system, the driven pulley assembly provides the driving force. The belt 200, clamped to the driven pulley assembly 100, rotates along with it. At engine idle, the belt 200 is in contact with the one-way bearing on the drive pulley assembly 300. Downhill, when the rotational speed transmitted from the driven pulley assembly 100 to the drive pulley assembly 300 via the belt 200 exceeds the rotational speed of the drive pulley assembly 300, the one-way bearing activates. At this point, the belt 200 drives the one-way bearing to rotate, which in turn drives the drive pulley assembly 300. Because the crankshaft is integrated with the drive pulley assembly, the belt 200 drives the crankshaft to rotate. Inside the engine, the crankshaft is subjected to internal resistance such as cylinder pressure. The crankshaft slows down the rotation of the drive pulley assembly 300, limiting its rotation and thus affecting the rotation of the belt 200, which in turn affects the rotation of the driven pulley assembly 100, reducing its speed. Since the driven pulley assembly 100 is indirectly connected to the vehicle's wheel hubs through the reduction gearbox, rear axle, etc., the vehicle speed decreases until it reaches the set downhill braking speed requirement, thereby achieving the downhill braking effect.

[0084] It should be noted that the belt remains in contact with the one-way bearing when idling.

[0085] When the crankshaft speed is greater than the belt speed, that is, when the speed of the drive pulley assembly is greater than the speed of the driven pulley assembly in the CVT engagement state, the one-way bearing does not function.

[0086] When the crankshaft speed is less than the belt speed, that is, when the speed of the drive pulley assembly is less than the speed of the driven pulley assembly in the CVT engagement state, the one-way bearing is activated.

[0087] In the driven wheel assembly 100, a connecting shaft 11 protrudes from the center of the first driven wheel 1. A cam cover 12 is located at the end of the connecting shaft 11 furthest from the first driven wheel 1, and the cam cover 12 has a cam groove 121 facing the first driven wheel 1. A second driven wheel 2 is fitted onto the connecting shaft 11 and located between the first driven wheel 1 and the cam cover 12. A limiting protrusion 21, which contacts the cam groove 121, is located on the side of the second driven wheel 2 closest to the cam cover 12. One end of a first elastic member 3 is connected to the second driven wheel 2, and the other end is connected to the cam cover 12. When the engine accelerates or decelerates, the distance between the first driven wheel 1 and the second driven wheel 2 changes, and the limiting protrusion 21 abuts against the wall of the cam groove 121 and slides along the wall of the cam groove 121. (Please refer to...) Figure 11 and Figure 12The cam groove 121 is basically U-shaped. The bottom 123 of the groove is smaller than the opening 124 of the groove. Therefore, when the distance between the first driven wheel 1 and the second driven wheel 2 is small, the limiting protrusion 21 is at the opening of the cam groove 121. It cannot simultaneously abut against the contact surfaces on both sides of the cam groove 121. Therefore, the limiting protrusion 21 has at least a gap with one side wall of the cam groove 121. At this time, the rotation speed of the driven wheel assembly 100 changes abruptly and will quickly hit the wall of the cam groove 121 and make a sound.

[0088] In the conventional driven wheel assembly 100, there is no elastic component. The buffer block 211 is the part that contacts the cam groove 121 of the cam cover 12. Therefore, the buffer block 211 cannot simultaneously satisfy the requirement of zero gap in the contact surface of the cam groove 121.

[0089] To address the aforementioned issues, this application improves the conventional driven wheel assembly 100 structure to ensure that the limiting protrusion 21 remains in contact with the wall of the cam groove 121 during the change in the distance between the first driven wheel 1 and the second driven wheel 2, thereby resolving the abnormal noise problem.

[0090] In one embodiment, please refer to Figure 2 This application provides a driven wheel assembly 100, which is connected to a driving wheel assembly 300 via a belt 200. The driven wheel assembly 100 includes: a first driven wheel 1, a second driven wheel 2, a first elastic element 3, and a buffer assembly 4. In this embodiment, the first driven wheel 1 is configured as a fixed disc, which rotates synchronously with the hub shaft. The second driven wheel 2 is configured as a moving disc, which can rotate relative to the first driven wheel 1. A connecting shaft 11 is provided at one end of the first driven wheel 1, and a cam cover 12 is provided at the end of the connecting shaft 11 away from the first driven wheel 1. The cam cover 12 is provided with a cam groove 121 facing the first driven wheel 1. The second driven wheel 2 is sleeved on the connecting shaft 11 and is located between the first driven wheel 1 and the cam cover 12. A limiting protrusion 21 that contacts the cam groove 121 is provided on the side of the second driven wheel 2 near the cam cover 12. One end of the first elastic element 3 is connected to the second driven wheel 2, and the other end of the first elastic element 3 is connected to the cam cover 12.

[0091] The buffer assembly 4 includes a buffer slider 41, a second elastic element 42, and a third elastic element 43. The buffer slider 41 is disposed between the second driven wheel 2 and the cam cover 12, and the buffer slider 41 extends with a first protrusion 411 and a second protrusion 412. The two ends of the second elastic element 42 abut against the second driven wheel 2 and the first protrusion 411, respectively, and the second elastic element 42 is used to push the limiting protrusion 21 on the second driven wheel 2 to abut against the cam groove 121. The two ends of the third elastic element 43 are connected to the limiting groove 441 and the second protrusion 412, respectively, and the third elastic element 43 is used to push the second protrusion 412 to abut against the cam groove 121. The positional relationship between the buffer slider 41, the second elastic element 42, and the third elastic element 43 can be referenced. Figure 10 .

[0092] The first driven wheel 1 and the second driven wheel 2 can be conventional disc-shaped structures, forming a V-groove between them to engage and clamp the V-belt 200. A connecting shaft 11 extends from the center of the first driven wheel 1. This connecting shaft 11 can be a hollow shaft, and a conventional key connection structure can be provided inside the connecting shaft 11 to connect with the output shaft. The second driven wheel 2 has an opening at its center so that it can be fitted onto the connecting shaft 11. At this time, the second driven wheel 2 can slide along the axial direction of the connecting shaft 11 and also rotate around the circumference of the connecting shaft 11. A cam cover 12 is provided at the end of the connecting shaft 11. The cam cover 12 can be fixed to the connecting shaft 11 using conventional connection structures, such as bolts or riveting.

[0093] The first elastic element 3 is connected at both ends to the cam cover 12 and the second driven wheel 2, respectively, and is positioned between them in a pre-compressed state. Thus, when the belt 200 pushes the second driven wheel 2 away from the first driven wheel 1, the first elastic element 3 is compressed. Conversely, when the belt 200 moves to the outer ring of the driven wheel assembly 100, the first elastic element 3 pushes the second driven wheel 2 closer to the first driven wheel 1. It should be noted that the first elastic element 3 provides not only axial extension force along the connecting shaft 11 but also torque along the circumferential direction of the connecting shaft 11, ensuring that the second driven wheel 2 rotates relative to the first driven wheel 1 when it moves away from or closer to the first driven wheel 1. The first elastic element 3 can be an elastic part such as a spring or a rubber column. It is made of elastic material and will deform under the action of external force and will return to its original shape after the external force is removed. In one embodiment, the first elastic element 3 can be a helical spring. The elasticity of the first elastic element 3 can ensure that the first driven wheel 1 and the second driven wheel 2 always clamp the belt 200 to prevent slippage and also ensure that the downhill braking function of the driven wheel assembly 100 is normal.

[0094] The cam cover 12 can be a bowl-shaped structure with a cam groove 121 on its side wall. Because the second driven wheel 2 will rotate relative to the first driven wheel 1 when it moves away from or near the first driven wheel 1, the limiting protrusion 21 on the second driven wheel 2 will move a certain distance circumferentially along the connecting shaft 11 within the cam groove 121. From another perspective, the wall of the cam groove 121 provides a guiding effect for the movement of the limiting protrusion 21 to a certain extent and restricts the movement trajectory of the second driven wheel 2.

[0095] The buffer slider 41 can be a nylon slider with a certain degree of wear resistance. The buffer slider 41 is positioned between the second driven wheel 2 and the cam cover 12. A first protrusion 411 and a second protrusion 412 extend from the buffer slider 41. The first protrusion 411 is connected to one end of the second elastic member 42, and the other end of the second elastic member 42 is connected to the second driven wheel 2. The connection between the second elastic member 42 and the second driven wheel 2 can be direct or indirect. The second protrusion 412 is connected to one end of the third elastic member 43, and the other end of the third elastic member 43 is connected to the limiting groove 441. The position and angle relationship between the first protrusion 411 and the second protrusion 412 can be flexibly set. The second elastic member 42 should be able to push the first protrusion 411 to abut against the cam groove 121, and the third elastic member 43 should be able to push the limiting protrusion 21 to abut against the cam groove 121. It should be noted that the strength relationship between the second elastic element 42 and the third elastic element 43 can be flexibly adjusted so that the antagonistic effect between them can ensure that when the second protrusion 412 and the limiting protrusion 21 move along the trajectory on the wall of the cam groove 121, the second elastic element 42 and the third elastic element 43 are always within the usable compression range.

[0096] In summary, in the driven wheel assembly 100, the limiting protrusion 21 on the second driven wheel 2 is pushed by the second elastic member 42 and abuts against the cam groove 121, and the second protrusion 412 on the buffer slider 41 is pushed by the third elastic member 43 and abuts against the cam groove 121. Thus, when the distance between the first driven wheel 1 and the second driven wheel 2 changes, the second protrusion 412 and the limiting protrusion 21 always abut against the cam groove 121, thereby avoiding the collision between the second protrusion 412 and the limiting protrusion 21 and the cam groove 121 during acceleration or deceleration of the driven wheel assembly 100 during downhill braking, which would cause abnormal noise. This improves the safety and comfort of the driven wheel assembly 100 during use.

[0097] In one embodiment, the buffer assembly 4 further includes a buffer fastener 44, see [link to relevant documentation]. Figure 2 and Figure 3The buffer fixing member 44 is fixed to the side of the second driven wheel 2 near the cam cover 12. A limiting groove 441 is provided on the side of the buffer fixing member 44 near the cam groove 121. The second elastic member 42 is located within the limiting groove 441, and one end of the second elastic member 42 is connected to the second driven wheel 2 through the buffer fixing member 44. The other end of the second elastic member 42 pushes the first protrusion 411 to move within the limiting groove 441 until the first protrusion 411 contacts the cam groove 121. Please refer to [link / reference]. Figure 9 The buffer fastener 44 can be composed of a first fastener 44a and a second fastener 44b. After the first fastener 44a and the second fastener 44b are assembled, a limiting groove 441 is formed, which significantly reduces the manufacturing difficulty and manufacturing cost.

[0098] To limit the position of the second elastic member 42, prevent the second elastic member 42 from detaching, and facilitate the connection between the second elastic member 42 and the second driven wheel 2, this embodiment also provides a buffer fixing member 44. The buffer fixing member 44 can be fixed to the side of the second driven wheel 2 near the cam cover 12 by bolts or the like. In this case, the buffer fixing member 44 can be understood as a part of the second driven wheel 2. The limiting groove 441 can be an arc-shaped groove arranged along the circumferential direction of the connecting shaft 11. The main body of the second elastic member 42 is housed in the limiting groove 441. One end of the second elastic member 42 abuts against the wall of the limiting groove 441, and the other end of the second elastic member 42 is connected to the first protrusion 411. The first protrusion 411 can be provided with a cylindrical structure or the like to facilitate the connection of the second elastic member 42. In this way, the second elastic member 42 can push the first protrusion 411 to maintain contact with the cam groove 121.

[0099] In one embodiment, the buffer assembly 4 further includes a fixing cover plate 45, which covers the limiting groove 441 and is used to limit the second elastic member 42 within the limiting groove 441.

[0100] Please see Figure 2 , Figure 3 and Figure 5 In order to further restrict the position of the second elastic member 42, this embodiment also provides a fixing cover plate 45 on the limiting groove 441. After the second elastic member 42 is installed in the limiting groove 441, the fixing cover plate 45 can be installed to improve the stability of the second elastic member 42, thereby ensuring the contact between the first protrusion 411 and the cam groove 121.

[0101] In one embodiment, the driven wheel assembly 100 includes multiple sets of buffer assemblies 4. The buffer assemblies 4 are evenly distributed along the circumferential direction of the second driven wheel 2 and fixed on the annular member 46. The cam cover 12 is provided with multiple cam grooves 121 corresponding to the position and number of the buffer assemblies 4. The side of the second driven wheel 2 near the cam cover 12 is provided with a limiting protrusion 21 corresponding to the cam groove 121.

[0102] Please see Figure 2 , Figure 5 , Figure 6 and Figure 7 Since the main body of the driven wheel assembly 100 is roughly a rotating structure, in order to ensure the functional stability and rotational balance of the driven wheel assembly 100, this embodiment sets multiple sets of buffer components 4, and makes each buffer component 4 evenly distributed along the circumferential direction of the second driven wheel 2 and fixed on a ring component 46 to ensure the stability of the spacing between each buffer component 4. In some embodiments, the use of three sets of buffer components 4 has a better effect and can ensure the smooth rotation of the driven wheel assembly 100.

[0103] In one embodiment, the cam cover 12 is provided with a structural sidewall 122 extending in the axial direction of the connecting shaft 11. The cam groove 121 is provided on the structural sidewall 122 and its opening faces the second driven wheel 2. The cam groove 121 includes a first contact surface 121a and a second contact surface 121b that are connected in transition. When the distance between the first driven wheel 1 and the second driven wheel 2 changes, the first protrusion 411 moves along the first contact surface 121a and the limiting protrusion 21 moves along the second contact surface 121b.

[0104] Please see Figure 4 , Figure 8 , Figure 11 and Figure 12 In this embodiment, the cam cover 12 is generally bowl-shaped. The structural sidewall 122 of the cam cover 12 extends toward the second driven wheel 2. The cam groove 121 is provided on the structural sidewall 122. The cam groove 121 includes a first contact surface 121a and a second contact surface 121b that are connected in transition. The two together form a cam groove 121 with an opening facing the second driven wheel 2. In this embodiment, the shifting operation feel of the driven wheel assembly 100 can be adjusted by adjusting the trajectory lines of the first contact surface 121a and the second contact surface 121b to achieve a better driving experience.

[0105] In one embodiment, a buffer block 211 is provided on the side of the limiting protrusion 21 near the cam groove 121.

[0106] Please see Figure 2 and Figure 8 The buffer block 211 can be a nylon block or a rubber block, which can be made of a material with a certain elasticity and wear resistance. The buffer block 211 can provide buffering and protection for the limiting protrusion 21.

[0107] In one embodiment, the buffer block 211 and the buffer slider 41 are nylon blocks.

[0108] In one embodiment, please refer to Figure 2The buffer block 211 is detachably connected to the limiting protrusion 21.

[0109] The detachable connection structure can be a threaded connection, a snap-fit ​​connection, a buckle connection, etc. Setting a detachable structure can facilitate the maintenance and replacement of the buffer block 211.

[0110] In one embodiment, the first elastic element 3 is a pressure torsion spring sleeved on the connecting shaft 11, and the first elastic element 3 is used to push the second driven wheel 2 closer to the first driven wheel 1.

[0111] Please see Figure 2 The pressure torsion spring not only provides axial thrust to the connecting shaft 11, but also circumferential torque to the connecting shaft 11. By setting the pressure torsion spring, the stability of the fit between the first driven wheel 1 and the second driven wheel 2 can be improved, ensuring that the belt 200 can be clamped by the two.

[0112] This application also provides a vehicle that uses the driven wheel assembly 100 described above. Therefore, the vehicle also possesses the advantages of the driven wheel assembly 100. It should be noted that the driven wheel assembly 100 can be applied to vehicles requiring a CVT transmission system, such as electric vehicles (EVs), pure electric vehicles (PEVs / BEVs), hybrid electric vehicles (HEVs), range-extended electric vehicles (REEVs), plug-in hybrid electric vehicles (PHEVs), and all-terrain vehicles.

[0113] The driven wheel assembly 100 in this application utilizes the connection relationship between the second elastic member 42, the third elastic member 43, the second driven wheel 2, and the buffer slider 41 to ensure that as the second driven wheel 2 moves away from or closer to the first driven wheel 1, the limiting protrusion 21 and the first protrusion 411 can always fit against the opposite side walls of the cam groove 121, thereby preventing the limiting protrusion 21 from colliding with the wall of the cam groove 121 and making noise under any circumstances (idling, acceleration, deceleration, etc.).

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A driven wheel assembly (100), the driven wheel assembly (100) being connected to a driving wheel assembly (300) via a belt (200), characterized in that, The driven wheel assembly (100) includes: A first driven wheel (1) is provided with a connecting shaft (11). A cam cover (12) is provided at one end of the connecting shaft (11) away from the first driven wheel (1). A cam groove (121) is provided on the cam cover (12) facing the first driven wheel (1). The second driven wheel (2) is sleeved on the connecting shaft (11) and located between the first driven wheel (1) and the cam cover (12). The second driven wheel (2) has a limiting protrusion (21) that contacts the cam groove (121) on the side near the cam cover (12). The first elastic element (3) is connected at one end to the second driven wheel (2) and at the other end to the cam cover (12). The buffer assembly (4) includes a buffer slider (41), a second elastic element (42) and a third elastic element (43). The buffer slider (41) is disposed between the second driven wheel (2) and the cam cover (12) and extends with a first protrusion (411) and a second protrusion (412). The two ends of the second elastic member (42) are respectively connected to the limiting protrusion (21) and the first protrusion (411); The two ends of the third elastic element (43) are respectively connected to the second driven wheel (2) and the second protrusion (412).

2. The driven wheel assembly (100) according to claim 1, characterized in that, The buffer assembly (4) further includes a buffer fixing member (44), which is fixed to the side of the second driven wheel (2) near the cam cover (12). The buffer fixing member (44) is provided with a limiting groove (441) on the side near the cam groove (121). The third elastic member (43) is located in the limiting groove (441), and one end of the third elastic member (43) is connected to the second driven wheel (2) through the buffer fixing member (44). The other end of the third elastic member (43) pushes the second protrusion (412) to move in the limiting groove (441) until the second protrusion (412) contacts the cam groove (121).

3. The driven wheel assembly (100) according to claim 2, characterized in that, The buffer assembly (4) further includes a fixing cover plate (45), which covers the limiting groove (441) and is used to limit the third elastic member (43) within the limiting groove (441).

4. The driven wheel assembly (100) according to claim 1, characterized in that, The driven wheel assembly (100) includes multiple sets of buffer assemblies (4). The buffer assemblies (4) are evenly distributed along the circumferential direction of the second driven wheel (2) and fixed on the annular part (46). The cam cover (12) is provided with multiple cam grooves (121) corresponding to the position and number of the buffer assemblies (4). The second driven wheel (2) is provided with a limiting protrusion (21) corresponding to the cam groove (121) on the side near the cam cover (12).

5. The driven wheel assembly (100) according to claim 1, characterized in that, The cam cover (12) is provided with a structural sidewall (122) extending in the axial direction of the connecting shaft (11). The cam groove (121) is provided on the structural sidewall (122) and its opening faces the second driven wheel (2). The cam groove (121) includes a first contact surface (121a) and a second contact surface (121b) that are connected in transition. When the distance between the first driven wheel (1) and the second driven wheel (2) changes, the second protrusion (412) moves along the first contact surface (121a) and the limiting protrusion (21) moves along the second contact surface (121b).

6. The driven wheel assembly (100) according to claim 1, characterized in that, A buffer block (211) is provided on the side of the limiting protrusion (21) near the cam groove (121).

7. The driven wheel assembly (100) according to claim 6, characterized in that, The buffer block (211) and the buffer slider (41) are nylon blocks.

8. The driven wheel assembly (100) according to claim 6, characterized in that, The buffer block (211) is detachably connected to the limiting protrusion (21).

9. The driven wheel assembly (100) according to claim 1, characterized in that, The first elastic element (3) is a pressure torsion spring sleeved on the connecting shaft (11), and the first elastic element (3) is used to push the second driven wheel (2) closer to the first driven wheel (1).

10. A vehicle, characterized in that, The vehicle is equipped with a driven wheel assembly (100) as described in any one of claims 1-9.

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