dry clutch

Abstract

A dry clutch includes a driven shaft and a mounting base rotatably sleeved on the driven shaft. The mounting base includes a sleeve and a clutch disc fixed at one end, with several inclined holes on the clutch disc. Alternating layers of first and second friction plates are sleeved on the sleeve. A housing fixed on the driven shaft is circumferentially linked with the second friction plates. Wave springs are held between adjacent first friction plates or between the first friction plates and the clutch disc. Sliding guide posts are provided in the inclined holes. Under centrifugal force, the guide posts slide out of the inclined holes and axially press against each friction plate, achieving power engagement. This invention integrates the centrifugal drive mechanism and the mounting base into one unit, resulting in a compact structure and rapid response. The active separation using wave springs ensures thorough separation and reduces drag wear.

Description

Technical Field

[0001] This utility model relates to the field of clutch technology, specifically to a dry clutch. Background Technology

[0002] The clutch is a key component in a motorcycle's transmission system, used to transmit or disconnect power between the engine and the gearbox. Currently, centrifugal dry clutches are mainly divided into two types: shoe-type and plate-type.

[0003] Shoe-type clutches, such as traditional scooter clutches, transmit torque through centrifugal shoes that directly rub against the inner wall of the clutch housing. However, this structure is prone to vehicle vibration and noise during engagement, and has limited torque capacity, resulting in poor riding comfort.

[0004] To address the aforementioned issues, plate clutches are widely adopted. One existing dry plate clutch (publication number CN115807820A) includes upper and lower spring fixing plates connected by a connecting spring, with a driven plate installed between them. A centrifugal rotor is installed within the raceway seat of the clutch spline sleeve. The centrifugal force generated by the rotor presses down on the spring fixing plates, causing the driven plate to press against the friction plates on the outer casing to transmit torque. While this structure is smoother than a shoe-type clutch, its centrifugal drive mechanism and pressing mechanism are relatively separated, resulting in a longer axial dimension and a less compact structure. Furthermore, its disengagement depends on the restoring force of the connecting spring, and there is still room for improvement in response speed and disengagement completeness.

[0005] Another existing technology (publication number CN112429143B) is a continuously variable transmission (CVT) mechanism for motorcycles. It utilizes a guide post inside an inclined hole on the drive wheel, which is thrown out under centrifugal force and pushes against the tray, thereby changing the working radius of the transmission belt. This structure reveals the principle of efficiently converting centrifugal force into axial thrust using an "inclined hole-guide post" mechanism, but its application is in transmission mechanisms, rather than clutch engagement and disengagement control.

[0006] Another example is the magnetic automatic clutch (announcement number CN219840944U), which utilizes a flyblock that rolls and moves axially within an inclined guide groove to press against alternately arranged clutch plates. This mechanism reduces frictional resistance through a roller assembly, but it has a complex structure, numerous parts, and high manufacturing and assembly costs.

[0007] Therefore, there is a lack of a dry clutch in the prior art that is compact, responsive, completely disengaged, and easy to assemble, in order to comprehensively solve the above-mentioned technical problems. Utility Model Content

[0008] The present invention aims to provide a dry clutch to solve the technical problems of existing plate clutches, such as non-compact structure, slow response, or incomplete disengagement.

[0009] The technical solution adopted by this utility model to solve its technical problem is: a dry clutch, comprising: a driven shaft; a mounting base rotatably sleeved on the driven shaft for receiving external rotational power; the mounting base includes a sleeve and a clutch disc fixedly disposed at one end of the sleeve; the clutch disc has a plurality of inclined holes radiating outward from its center and inclined in the depth direction to its axial direction; a friction plate assembly sleeved on the sleeve, comprising at least one first friction plate and at least one second friction plate alternately stacked; the first friction plate and the sleeve are engaged in a manner that allows axial sliding and circumferential linkage; a housing fixedly sleeved on the driven shaft, wherein the second friction plate and the housing... The housing is fitted in a manner that allows for axial sliding and circumferential linkage; a wave spring is coaxially sleeved on the sleeve and elastically clamped between adjacent first friction plates or between the first friction plates and the clutch disc, for causing adjacent first and second friction plates to tend to separate in a non-working state; a plurality of guide posts are slidably and correspondingly arranged in each of the inclined holes; under the action of centrifugal force generated by the rotation of the mounting base, the guide posts tend to slide out along the inclined holes and push against the adjacent friction plate assemblies, thereby axially pressing each friction plate, so that the rotational power of the mounting base is transmitted to the housing and the driven shaft through the pressed friction plates.

[0010] Preferably, the mounting base further includes a pressure plate, which is fixedly disposed at the other end of the sleeve away from the clutch disc, the friction plate assembly is located between the clutch disc and the pressure plate, and the wave spring is also elastically clamped between the first friction plate and the pressure plate.

[0011] Preferably, the sleeve has a plurality of positioning blocks evenly distributed around its circumference at the end away from the clutch disc, and a threaded hole is provided between two adjacent positioning blocks; the pressure plate has positioning holes and mounting holes respectively corresponding to the positions of the positioning blocks and the threaded holes, and bolts pass through the mounting holes and are screwed into the threaded holes to detachably fix the pressure plate to the end of the sleeve.

[0012] Preferably, the mounting base further includes a bushing, the sleeve is connected to the bushing via the pressure plate, the bushing is rotatably fitted onto the driven shaft, and the bushing is used to receive external rotational power and transmit the power to the sleeve.

[0013] Preferably, the outer wall of the sleeve is provided with a plurality of first slots extending along its axial direction, and the inner hole of the first friction plate is provided with a first locking block that slides and engages with the first slots, so as to realize the axial sliding and circumferential linkage between the first friction plate and the sleeve.

[0014] Preferably, the outer ring of the second friction piece is provided with a second locking block, and the side wall of the sleeve is provided with a plurality of second locking grooves extending along its axial direction. The second locking block of each second friction piece is correspondingly slidably engaged in each of the second locking grooves to realize the axial sliding and circumferential linkage of the sleeve and the second friction piece.

[0015] Preferably, the outer diameter of the wave spring is smaller than the inner diameter of the second friction plate, and the wave spring is radially supported between the inner hole of the second friction plate and the outer wall of the sleeve, so that the second friction plate and the sleeve remain coaxial.

[0016] Preferably, the top of the guide post is spherical, so that it can make point contact and press against the adjacent friction plate assembly under the centrifugal force.

[0017] The beneficial effects of this utility model are: 1. By directly integrating the "tilted hole-guide post" mechanism that generates centrifugal driving force onto the mounting base (clutch disc) of the friction plate assembly, the integrated design of the drive mechanism and the actuator is realized. No additional raceway seat, fly block frame or other structures are required, which greatly shortens the axial length of the clutch and makes the overall structure more compact. 2. The engine power directly drives the mounting base and the internal guide column to rotate. Under the action of centrifugal force, the guide column slides directly out of the inclined hole and pushes the friction plate assembly. The force transmission path is short, there are fewer intermediate links, the response speed is faster, and the power transmission is more direct and efficient. 3. In the non-working state, the pre-compressed wave spring provides elastic restoring force to actively push the first and second friction plates of each layer apart and maintain the gap, ensuring the complete disengagement of the clutch and effectively reducing friction plate dragging wear and power loss caused by incomplete disengagement. 4. The pressure plate is detachably fixed to the end of the sleeve by positioning blocks and bolts, which not only ensures the assembly accuracy, but also facilitates the disassembly and replacement of internal wear parts such as friction plates and wave springs, thereby reducing manufacturing and maintenance costs. Attached Figure Description

[0018] Figure 1 This is a usage state diagram of an embodiment of this utility model; Figure 2 This is a side view of an embodiment of the present utility model; Figure 3 This is a utility model Figure 2 AA section view; Figure 4 This is an exploded view of one embodiment of the present utility model.

[0019] In the diagram: 1. Driven shaft; 2. Mounting base; 21. Sleeve; 211. First slot; 212. Positioning block; 213. Threaded hole; 22. Clutch disc; 221. Inclined hole; 23. Pressure plate; 231. Positioning hole; 232. Mounting hole; 3. Friction plate assembly; 31. First friction plate; 311. First locking block; 32. Second friction plate; 321. Second locking block; 4. Sleeve; 41. Second slot; 5. Wave spring; 6. Guide post; 7. Bushing; 8. Bolt; 9. Driven wheel. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. Example

[0021] like Figures 1 to 4 The dry clutch shown is particularly suitable as an automatic centrifugal clutch for motorcycles. The clutch includes a driven shaft 1, a mounting base 2, a friction plate assembly 3, a housing 4, a wave spring 5, and several guide posts 6.

[0022] The driven shaft 1 is the power output end of the clutch. In actual use, it is connected to the input shaft of the motorcycle's gearbox to transmit power to the rear wheel.

[0023] The mounting base 2 is rotatably fitted onto the driven shaft 1 to receive rotational power from an external power source such as an engine. Specifically, the mounting base 2 includes a bushing 7, a sleeve 21, a clutch disc 22, and a pressure plate 23. The bushing 7 is rotatably fitted onto the driven shaft 1 via bearings, and its outer end is used to fixally connect to the driven wheel 9 (e.g., a sprocket or pulley). The driven wheel 9 is connected to the drive wheel on the engine crankshaft via a chain or belt.

[0024] The sleeve 21 and the clutch disc 22 are integrally formed, constituting a bowl-shaped component with an outer wall and an end plate. The sleeve 21 is connected to the bushing 7 via a pressure plate 23. Specifically, the pressure plate 23 has a non-circular hole (or a spline hole) at its center, and the outer wall of the bushing 7 has a non-circular mating section (or spline section) that matches the shape of the non-circular hole. During assembly, the pressure plate 23 and the sleeve 21 are first fixedly connected. At the end of the sleeve 21 away from the clutch disc 22, several positioning blocks 212 are evenly distributed around its circumference, and threaded holes 213 are formed on the end face of the sleeve 21 between two adjacent positioning blocks 212. The pressure plate 23 is an annular disc, and its outer ring has positioning holes 231 and mounting holes 232 that correspond one-to-one with the positions of the positioning blocks 212 and the threaded holes 213, respectively. Align the positioning hole 231 of the pressure plate 23 with the positioning block 212 of the sleeve 21 to achieve radial and circumferential positioning. Then, use a bolt 8 to pass through the mounting hole 232 and screw it into the threaded hole 213 to accurately and firmly fix the pressure plate 23 to the end of the sleeve 21. After fixing the pressure plate 23 to the sleeve 21, fit the integral structure consisting of the sleeve 21, clutch plate 22 and pressure plate 23 onto the bushing 7, so that the mating section of the bushing 7 passes into the non-circular hole of the pressure plate 23, realizing the transmission connection between the bushing 7 and the mounting base 2. At this time, the pressure plate 23 forms a fixed connection with the sleeve 21 and a transmission connection with the bushing 7, thereby transmitting the power received by the bushing 7 to the entire mounting base 2. This detachable design also facilitates the assembly and maintenance of internal parts.

[0025] On the outer wall of the sleeve 21, several first grooves 211 extending axially are formed along its circumference for engaging with the first friction plate 31. On the clutch disc 22, several inclined holes 221 are formed around its axis. These inclined holes 221 are radially distributed outward from the center of the clutch disc 22, and their depth direction is inclined to the axial direction of the clutch disc 22, that is, the bottom of the hole is close to the axis, and the opening of the hole is inclined away from the axis.

[0026] The friction plate assembly 3 is sleeved on the sleeve 21 and located between the clutch disc 22 and the pressure plate 23. It consists of at least one first friction plate 31 and at least one second friction plate 32 stacked alternately. The first friction plate 31 is the driving plate, and its inner hole edge has several first locking blocks 311 protruding inward to match the first locking groove 211. The first locking blocks 311 are slidably engaged in the first locking groove 211, so that the first friction plate 31 can both rotate with the mounting base 2 and slide axially. The second friction plate 32 is the driven plate, and its outer ring has several second locking blocks 321 protruding outward.

[0027] The housing 4 is an open-end cover that is fixedly fitted onto the driven shaft 1. In this embodiment, the cylindrical sidewall of the housing 4 has several axially extending second slots 41. The second locking blocks 321 of each second friction plate 32 are slidably engaged in the second slots 41, so that the second friction plate 32 can rotate with the housing 4 and the driven shaft 1, and can also slide axially.

[0028] Wave springs 5 ​​are coaxially sleeved on sleeve 21, and their number is the same as that of the second friction plates 32. Each wave spring 5 is located in the inner hole of one second friction plate 32. The outer diameter of the wave spring 5 is smaller than the inner hole diameter of the second friction plate 32, so that it can be radially supported between the inner hole of the second friction plate 32 and the outer wall of sleeve 21. It not only plays a role in radial centering of the second friction plate 32, but also elastically pushes against the first friction plates 31 on both sides of it in the axial direction, or pushes against one side of the first friction plate 31 and the pressure plate 23, or pushes against one side of the first friction plate 31 and the clutch plate 22. When the clutch is not engaged, the elastic force of the wave spring 5 will force the first friction plates 31 and the second friction plates 32 to separate from each other, forming a gap and cutting off the power transmission.

[0029] Several guide posts 6 are slidably disposed within a corresponding inclined hole 221. The top of the guide post 6 is ball-shaped. When the engine is idling or at low speed, the centrifugal force on the guide post 6 is small, and it is confined to the bottom of the inclined hole 221, thus not generating axial thrust, and the clutch remains disengaged.

[0030] As the engine speed increases, the rotational speed of the drive mounting base 2 also increases. When the speed reaches the preset engagement point, the centrifugal force on the guide post 6 increases, and it begins to overcome resistance and slide outward along the inclined hole 221. Due to the inclined design of the inclined hole 221, the guide post 6 will generate axial displacement while sliding out, and its ball-shaped top will push against an adjacent first friction plate 31 (or pressure plate 23 or second friction plate 32 if structurally required), forming point contact and clamping. As the speed continues to increase, the axial thrust of the guide post 6 increases, gradually overcoming the elastic force of all wave springs 5, and pressing all the alternately arranged first friction plates 31 and second friction plates 32 axially between the clutch disc 22 and the pressure plate 23. At this time, the power of the rotating mounting base 2 is transmitted from the first friction plate 31 to the second friction plate 32 through friction, and then from the second friction plate 32 to the housing 4, ultimately driving the driven shaft 1 to rotate, realizing the engagement and transmission of power.

[0031] As the engine speed decreases, the centrifugal force diminishes, and the elastic force of the wave spring 5 pushes the friction plates apart. The guide post 6 then retracts into the inclined hole 221, and the clutch disengages again, cutting off power. Under this working principle, the clutch utilizes an integrated "inclined hole-guide post" drive mechanism and plate friction components to achieve a compact structure, rapid response, and thorough disengagement.

Claims

1. A dry clutch characterized by: The utility model relates to a kind of friction clutch, including: Driven shaft (1); Mounting seat (2), rotatably sleeved on the driven shaft (1), for receiving external rotary power;The mounting seat (2) includes sleeve (21) and the clutch disc (22) fixed at one end of the sleeve (21);The clutch disc (22) is provided with a plurality of inclined holes (221) inclined to its axial direction in the depth direction along the center thereof outwardly radiate;Friction plate assembly (3), sleeve on the sleeve (21), including at least one first friction plate (31) and at least one second friction plate (32) arranged alternately;The first friction plate (31) and the sleeve (21) are axially slidably and circumferentially linked to cooperate; Sleeve (4), fixed sleeve on the driven shaft (1), the second friction plate (32) and the sleeve (4) are axially slidably and circumferentially linked to cooperate; Wave spring (5), coaxially sleeve on the sleeve (21), and be elastically clamped between adjacent first friction plate (31) or between first friction plate (31) and clutch disc (22), for making adjacent first friction plate (31) and second friction plate (32) tend to separate in non-working state; A plurality of guide posts (6) are slidably arranged one by one in each inclined hole (221);Under the action of centrifugal force generated by the rotation of the mounting seat (2), the guide post (6) has the tendency to slide out of the inclined hole (221) and push the adjacent friction plate assembly (3), so that each friction plate is axially compressed, and the rotary power of the mounting seat (2) is transmitted to the sleeve (4) and the driven shaft (1) through the compressed friction plate. The mounting seat (2) further comprises a pressure plate (23), and the pressure plate (23) is fixedly arranged at the other end of the sleeve (21) away from the clutch disc (22), the friction plate assembly (3) is located between the clutch disc (22) and the pressure plate (23), and the wave spring (5) is also elastically clamped between the first friction plate (31) and the pressure plate (23).

2. The dry clutch of claim 1, wherein: The end of the sleeve (21) away from the clutch disc (22) is provided with a plurality of positioning blocks (212) uniformly distributed along the circumference thereof, and a threaded hole (213) is arranged between adjacent two positioning blocks (212);The pressure plate (23) is provided with a positioning hole (231) and a mounting hole (232) corresponding to the positions of the positioning block (212) and the threaded hole (213) respectively, and a bolt (8) is screwed through the mounting hole (232) and the threaded hole (213) to detachably fix the pressure plate (23) to the end of the sleeve (21).

3. The dry clutch of claim 2, wherein: The mounting seat (2) further comprises a shaft sleeve (7), and the sleeve (21) is connected with the shaft sleeve (7) through the pressure plate (23), the shaft sleeve (7) is rotatably sleeved on the driven shaft (1), and the shaft sleeve (7) is used for receiving external rotary power and transmitting power to the sleeve (21).

4. The dry clutch of claim 2, wherein: ​ 5. The dry clutch of claim 1, wherein: The sleeve (21) is provided with a plurality of first clamping grooves (211) extending along the axial direction of the sleeve (21), and the inner hole of the first friction plate (31) is provided with a first clamping block (311) which is slidably clamped in the first clamping groove (211) to realize the axial sliding and circumferential linkage of the first friction plate (31) and the sleeve (21).

6. The dry clutch of claim 1, wherein: The outer ring of the second friction plate (32) is provided with a second clamping block (321), and the side wall of the sleeve (4) is provided with a plurality of second clamping grooves (41) extending along the axial direction of the sleeve (4). The second clamping block (321) of each second friction plate (32) is slidably clamped in the second clamping groove (41) to realize the axial sliding and circumferential linkage of the sleeve (4) and the second friction plate (32).

7. The dry clutch of claim 1, wherein: The outer diameter of the wave spring (5) is smaller than the inner hole diameter of the second friction plate (32), and the wave spring (5) is radially supported between the inner hole of the second friction plate (32) and the outer wall of the sleeve (21) to keep the second friction plate (32) coaxial with the sleeve (21).

8. The dry clutch of claim 1, wherein: The top of the guide column (6) is in the shape of a ball head, so that it can form a point contact and compression with the adjacent friction plate assembly (3) under the action of centrifugal force.

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