Clutch, reduction mechanism, and electric vehicle

Abstract

The application discloses a kind of clutch, reduction mechanism and electric vehicle, clutch includes: inner ring and outer star wheel, outer star wheel is sleeved in the outside of inner ring, and the inner wall of outer star wheel is spaced apart with multiple wedge grooves;Between outer star wheel and inner ring, retainer is equipped, and the plurality of rollers are connected with retainer, and roller is inserted in the wedge groove of the inner wall of outer star wheel, and roller is matched with wedge groove and realizes the one-way clutch between inner ring and outer star wheel;Along the axial direction of roller, the outer wall surface of roller is set as first curved surface, the outer wall surface of inner ring is set as second curved surface matching first curved surface, the bottom surface of wedge groove is set as third curved surface matching first curved surface, and first curved surface abuts second curved surface and third curved surface to limit the axial movement of roller in inner ring, the clutch of the first aspect embodiment of the application, the resistance generated between first curved surface and second curved surface and third curved surface is used to offset the axial external force received by clutch, so that clutch can withstand axial load.

Description

TECHNICAL FIELD

[0001] The present application relates to the clutch technical field, specifically relates to a kind of clutch, reduction mechanism and electric vehicle. BACKGROUND

[0002] The hub of electric vehicle is generally provided with reduction mechanism, and the reduction mechanism includes gear transmission assembly and clutch, and the clutch utilizes the transformation of rotation direction to realize the function of power transmission and separation between driving part and driven part, when the motor of electric vehicle is started, the output shaft of motor drives the rotation of inner ring, the clutch is in the combined state, and the power transmitted from motor rotating shaft to inner ring is transmitted to outer star wheel through roller to drive the rotation of electric vehicle hub;When need to push electric vehicle, the hub of electric vehicle drives the rotation of outer star wheel, and the clutch is in the overrun state, and the outer star wheel can rotate relative to inner ring, at this time, the resistance of pushing is smaller, but in the related art, when the clutch bears axial external force, the roller is easy to fall off, there is certain safety hazard, and when the coaxiality of inner ring and outer star wheel (or outer star wheel and inner star wheel) is poor, the effective contact area of roller and inner ring and outer star wheel is reduced, and the stress of effective contact surface of roller and inner ring and outer star wheel will increase sharply, to cause the service life of clutch to reduce. SUMMARY

[0003] The present application aims at at least solving one of the technical problems existing in the prior art. To this end, the present application proposes a kind of clutch, and the roller is not easy to fall off when the clutch bears axial external force.

[0004] Secondly, the present application simultaneously proposes a kind of reduction mechanism with the above-mentioned clutch.

[0005] Thirdly, the present application simultaneously proposes a kind of electric vehicle with the above-mentioned reduction mechanism.

[0006] According to the clutch of the first aspect of the present application, the clutch includes: inner ring and outer star wheel, the outer star wheel is sleeved on the outer side of the inner ring, and the inner wall surface of the outer star wheel is circumferentially spaced apart from a plurality of wedge-shaped grooves;Wherein, the retaining cage is arranged between the outer star wheel and the inner ring, and the retaining cage is connected with a plurality of rollers, the rollers are located in the wedge-shaped grooves, and the rollers and the wedge-shaped grooves cooperate to realize the one-way clutch between the inner ring and the outer star wheel;Along the axial direction of the roller, the outer wall surface of the roller is provided as a first curved surface, the outer wall surface of the inner ring is provided as a second curved surface matched with the first curved surface, and the bottom surface of the wedge-shaped groove is provided as a third curved surface matched with the first curved surface, and the first curved surface abuts against the second curved surface and the third curved surface to limit the movement of the roller along the axial direction of the inner ring.

[0007] According to the clutch of the first aspect of the present application, at least the following advantages are achieved: by setting the outer wall of the roller as a first curved surface, setting the outer wall surface of the inner ring as a second curved surface matching the first curved surface, and setting the bottom wall of the wedge-shaped groove as a third curved surface matching the first curved surface, the first curved surface of the roller outer wall abuts against the second curved surface of the inner ring outer wall and the third curved surface of the outer sun gear inner wall, when the clutch is subjected to an axial external force, due to the abutment between the first curved surface of the roller outer wall and the second curved surface of the inner ring outer wall and the third curved surface of the outer sun gear inner wall, a relatively large resistance is generated between the first curved surface and the second curved surface, the resistance is opposite to the direction of the axial external force of the clutch, which can limit the axial movement of the roller and the inner ring along the inner ring, and similarly, a relatively large resistance is also generated between the first curved surface and the third curved surface, the resistance is also opposite to the direction of the axial external force of the clutch, which can limit the axial movement of the roller and the outer sun gear along the inner ring. The clutch provided by the first aspect of the present application can bear axial load through the cooperation of the first curved surface and the second curved surface and the third curved surface, the roller is not easy to fall off, and the safety of the clutch is improved. Meanwhile, the clutch also has the self-centering function, when the coincidence degree of the center of the inner ring and the center of the outer sun gear is poor, the roller rolls in the wedge-shaped groove under the action of the external force, so that the first curved surface of the roller outer wall is attached to the second curved surface of the inner ring outer wall and the third curved surface of the outer sun gear inner wall, the relative position relationship between the outer sun gear and the inner ring can be adjusted accordingly, the coincidence degree of the center of the inner ring and the center of the outer sun gear can be adjusted within a certain range, so as to increase the effective contact area of the roller and the inner ring and the outer sun gear, and the service life of the clutch is improved.

[0008] According to some embodiments of the first aspect of the present application, the first curved surface, the second curved surface and the third curved surface are all arc surfaces.

[0009] According to some embodiments of the first aspect of the present application, the radius of the first curved surface is equal to the radius of the second curved surface.

[0010] According to some embodiments of the first aspect of the present application, the radius of the first curved surface is equal to the radius of the third curved surface.

[0011] According to some embodiments of the first aspect of the present application, along the radial direction of the inner ring, the distance from the center of the inner ring to the roller plus the diameter of the roller is equal to the radius of the third curved surface.

[0012] According to some embodiments of the first aspect of the present application, the first curved surface is convex along the radial direction of the roller or concave along the radial direction of the roller.

[0013] According to some embodiments of the first aspect of the present application, the retainer is provided with a plurality of mounting grooves, the plurality of mounting grooves are arranged at intervals along the circumferential direction of the retainer, and each of the mounting grooves is provided with one roller.

[0014] According to some embodiments of the first aspect of the present application, the holder is provided with a plurality of mounting portions, the mounting slots are arranged on the mounting portions, and a resilient member is arranged between the outer wall of the mounting portion and the side surface of the wedge-shaped slot, one end of the resilient member abutting against the outer wall of the holder and the other end abutting against the side surface of the wedge-shaped slot.

[0015] According to some embodiments of the first aspect of the present application, the holder is provided with a receiving slot, and the resilient member is a spring, one end of the spring being located in the receiving slot.

[0016] According to some embodiments of the first aspect of the present application, the number of the rollers is three to thirty.

[0017] According to the second aspect of the present application, the reducer comprises the clutch of the first aspect of the present application, the clutch comprises an inner ring, an outer star wheel, a holder and a roller, the outer wall of the roller is provided with a first curved surface, the outer wall surface of the inner ring is provided with a second curved surface matching the first curved surface, and the bottom wall of the wedge-shaped slot is provided with a third curved surface matching the first curved surface, the first curved surface of the outer wall of the roller abutting against the second curved surface of the outer wall of the inner ring and the third curved surface of the inner wall of the outer star wheel, when the reducer is subjected to an axial external force, the axial external force is transmitted to the clutch, because the first curved surface of the outer wall of the roller abuts against the second curved surface of the outer wall of the inner ring and the third curved surface of the inner wall of the outer star wheel, a large resistance is generated between the first curved surface and the second curved surface, the resistance is opposite to the direction of the axial external force of the clutch, which can limit the axial movement of the roller and the inner ring along the inner ring, and similarly, a large resistance is also generated between the first curved surface and the third curved surface, the resistance is also opposite to the direction of the axial external force of the clutch, which can limit the axial movement of the roller and the outer star wheel along the inner ring, which is beneficial to improve the safety of the clutch; and the clutch also has a self-centering function, when the coincidence degree of the center of the inner ring and the center of the outer star wheel is poor, the roller can roll in the wedge-shaped slot under the action of the external force, so that the first curved surface of the outer wall of the roller abuts against the second curved surface of the outer wall of the inner ring and the third curved surface of the inner wall of the outer star wheel, to correspondingly adjust the relative position relationship between the outer star wheel and the inner ring, to adjust the coincidence degree of the center of the inner ring and the center of the outer star wheel within a certain range, to increase the effective contact area of the roller and the inner ring and the outer star wheel, which is beneficial to improve the service life of the clutch; the reducer provided by the second aspect of the present application can offset the axial external force of the clutch by the resistance generated between the first curved surface and the second curved surface and the third curved surface of the clutch, which is opposite to the direction of the axial external force of the clutch, so that the outer star wheel, the roller and the inner ring cannot move along the axial direction of the inner ring, the roller is not easy to fall off, which is beneficial to improve the safety and service life of the reducer.

[0018] According to the third aspect of the present application, the electric vehicle comprises the reducer of the second aspect of the present application, and has all the beneficial effects of the second aspect of the present application.

[0019] Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will be obvious from the description, or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will be obvious from the description, or can be learned by practice of the application.

[0021] Figure 1 A schematic view of an overall structure of an embodiment of the first aspect of the present application;

[0022] Figure 2 A schematic view of an exploded structure of an embodiment of the first aspect of the present application;

[0023] Figure 3 A sectional view of an embodiment of the first aspect of the present application;

[0024] Figure 4 A sectional view of an embodiment of the first aspect of the present application from another angle;

[0025] Figure 5 A sectional view of an embodiment of the first aspect of the present application of an inner ring and an outer star wheel;

[0026] Figure 6 A schematic view of a structure of an inner ring of an embodiment of the first aspect of the present application;

[0027] Figure 7 A schematic view of a structure of a roller of an embodiment of the first aspect of the present application;

[0028] Figure 8 A schematic view of a structure of an outer star wheel of an embodiment of the first aspect of the present application.

[0029] The reference signs are listed as follows:

[0030] Inner ring 100, second curved surface 110;

[0031] Outer star wheel 200, wedge-shaped groove 210, third curved surface 211;

[0032] Retainer 300, roller 310, first curved surface 311, mounting groove 320, elastic member 330, accommodating groove 340. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example embodiments in which the same or similar elements or elements having the same or similar functions are denoted by the same reference signs and wherein:

[0034] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0035] In the description of the present application, if the first, second, etc. are described, they are only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0036] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0037] The hub of the electric vehicle is generally provided with a reduction mechanism, and the reduction mechanism includes a gear transmission assembly and a clutch. The clutch uses the change of the rotation direction to realize the function of power transmission and separation between the driving part and the driven part. When the motor of the electric vehicle is started, the output shaft of the motor drives the inner ring 100 to rotate, the roller 310 rolls on the wedge-shaped groove 210, and the distance between the outer star wheel 200 and the inner ring 100 is reduced. The clutch is in the combined state, and the power transmitted from the motor rotating shaft to the inner ring 100 is transmitted to the outer star wheel 200 through the roller 310 to drive the electric vehicle hub to rotate. When the electric vehicle needs to be pushed, the hub of the electric vehicle drives the outer star wheel 200 to rotate, the roller 310 rolls on the wedge-shaped groove 210, and the distance between the outer star wheel 200 and the inner ring 100 is increased. The clutch is in the overrunning state, and the outer star wheel 200 can rotate relative to the inner ring 100. At this time, the resistance of pushing is small, but in the related art, when the clutch bears the axial external force, the roller 310 is easy to fall off, which has certain safety hazards.

[0038] To solve the problem, the embodiment of the first aspect of the present application proposes a clutch, the outer wall of the roller 310 is provided as a first curved surface 311, the outer wall surface of the inner ring 100 is provided as a second curved surface 110 matching the first curved surface 311, and the bottom wall of the wedge-shaped groove 210 is provided as a third curved surface 211 matching the first curved surface 311. The first curved surface 311 of the outer wall of the roller 310 abuts the second curved surface 110 of the outer wall of the inner ring 100 and the third curved surface 211 of the inner wall of the outer star wheel 200. When the clutch is subjected to an axial external force, a resistance is generated between the first curved surface 311 of the outer wall of the roller 310 and the second curved surface 110 of the outer wall of the inner ring 100 and the third curved surface 211 of the inner wall of the outer star wheel 200 to offset the axial external force received by the clutch, and the axial movement of the roller 310 along the inner ring 100 can be limited. The specific structure and function of the clutch of the embodiment of the first aspect of the present application will be further described below in combination with the drawings and texts.

[0039] Referring to Figures 1 to 4 , according to the clutch of the embodiment of the first aspect of the present application, the clutch comprises an inner ring 100 and an outer star wheel 200, the radius of the outer star wheel 200 is larger than the radius of the inner ring 100, the outer star wheel 200 is coaxially arranged with the inner ring 100 and is sleeved on the outer side of the inner ring 100, and the inner wall surface of the outer star wheel 200 is circumferentially spaced to be provided with a plurality of wedge-shaped grooves 210; wherein, a gap between the outer star wheel 200 and the inner ring 100 is provided with a circular retainer 300, the peripheral wall of the retainer 300 is spaced to be connected with a plurality of rollers 310, the rollers 310 are inserted into the wedge-shaped grooves 210 of the inner wall of the outer star wheel 200, the distance from one end of the bottom wall of the wedge-shaped groove 210 to the center of the inner ring 100 is less than the distance from the outer wall surface of the roller 310 to the center of the inner ring 100, the distance from the other end of the bottom wall of the wedge-shaped groove 210 to the center of the inner ring 100 is greater than the maximum distance from the outer wall surface of the roller 310 to the center of the inner ring 100, the roller 310 can roll in the wedge-shaped groove 210, and the roller 310 cooperates with the wedge-shaped groove 210 to realize the one-way clutch between the inner ring 100 and the outer star wheel 200; as viewed along the axial direction of the roller 310, the outer wall surface of the roller 310 is provided as a first curved surface 311, the outer wall surface of the inner ring 100 is provided as a second curved surface 110 matching the first curved surface 311, and the bottom surface of the wedge-shaped groove 210 is provided as a third curved surface 211 matching the first curved surface 311, the first curved surface 311 abuts the second curved surface 110 and the third curved surface 211 to limit the axial movement of the roller 310 along the inner ring 100, and the roller 310 can be limited between the inner ring 100 and the outer star wheel 200.

[0040] The clutch of the first aspect of the present application, by setting the outer wall of the roller 310 as the first curved surface 311, setting the outer wall surface of the inner ring 100 as the second curved surface 110 matching the first curved surface 311, and setting the bottom wall of the wedge-shaped groove 210 as the third curved surface 211 matching the first curved surface 311, the first curved surface 311 of the outer wall of the roller 310 abuts the second curved surface 110 of the outer wall of the inner ring 100 and the third curved surface 211 of the inner wall of the outer star wheel 200, when the clutch is subjected to an axial external force, due to the abutment between the first curved surface 311 of the outer wall of the roller 310 and the second curved surface 110 of the outer wall of the inner ring 100 and the third curved surface 211 of the inner wall of the outer star wheel 200, a larger resistance opposite to the direction of the axial external force received by the clutch is generated between the first curved surface 311 and the second curved surface 110, which can limit the axial movement of the roller 310 and the inner ring 100 along the axis of the inner ring 100, and for the same reason, a larger resistance opposite to the direction of the axial external force received by the clutch is also generated between the first curved surface 311 and the third curved surface 211, which can limit the axial movement of the roller 310 and the outer star wheel 200 along the axis of the inner ring 100. The clutch provided by the first aspect of the present application can offset the axial external force received by the clutch through the resistance generated between the first curved surface 311, the second curved surface 110 and the third curved surface 211, which is opposite to the direction of the axial external force received by the clutch, so that the outer star wheel 200, the roller 310 and the inner ring 100 cannot move along the axis of the inner ring 100, the roller 310 is not easy to fall off, and the safety of the clutch is improved.

[0041] It can be understood that the clutch provided by the first aspect of the present application also has a self-centering function. In the production process, due to the machining problems of the outer star wheel 200 and the inner ring 100, when the coincidence degree of the center of the inner ring 100 and the center of the outer star wheel 200 is poor after installation, under the action of external force, the roller 310 rolls in the wedge-shaped groove 210, the first curved surface 311 of the outer wall of the roller 310 is attached to the second curved surface 110 of the outer wall of the inner ring 100, and a circular ring coinciding with the center of the inner ring 100 is formed between the plurality of rollers 110, and for the same reason, the first curved surface 311 of the outer wall of the roller 310 is attached to the third curved surface 211 of the inner wall of the outer star wheel 200, and the center of the outer star wheel 200 coincides with the center of the inner ring 100; the first curved surface 311 of the outer wall of the roller 310 is attached to the second curved surface 110 of the outer wall of the inner ring 100 and the third curved surface 211 of the inner wall of the outer star wheel 200, so as to adjust the relative position relationship between the outer star wheel 200 and the inner ring 100, and to adjust the coincidence degree of the center of the inner ring 100 and the center of the outer star wheel 200 within a certain range, so as to increase the effective contact area of the roller 310 with the inner ring 100 and the outer star wheel 200, and improve the service life of the clutch.

[0042] It should be noted that the inner hole of the inner ring 100 is also provided with a clamping structure such as a spline, a key, etc., and the inner hole of the inner ring 100 is used to connect the output shaft of the driving device; the retainer 300 does not directly bear the load but limits the roller 310, so the retainer 300 can be made of plastic material, such as PBT\ABS material, which can reduce the production cost to a certain extent; the inner ring 100, the roller 310 and the outer star wheel 200 are the main load-bearing components, which can be made of high-carbon chromium bearing steel or carburizing steel, such as Gcr15 steel or 20CrMnTi steel, which has good wear resistance and high contact fatigue strength, which can effectively meet the use requirements of the clutch; the wedge angle of the wedge-shaped groove 210 can be five to ten degrees, such as setting the wedge angle of the wedge-shaped groove 210 to seven degrees, and the wedge-shaped groove 210 has a good inclination, which is beneficial to the switching of the overrunning state and the combined state of the clutch.

[0043] Referring to Figures 4 to 8 It can be understood that the first curved surface 311 of the outer wall of the roller 310 and the second curved surface 110 of the outer wall of the inner ring 100 and the third curved surface 211 of the inner wall of the outer star wheel 200 are all arc surfaces, at this time, the first curved surface 311 and the second curved surface 110 have a long fitting curve and a large fitting area, and the first curved surface 311 and the third curved surface 211 also have a long fitting curve and a large fitting area, which is beneficial to improve the resistance between the first curved surface 311 and the second curved surface 110 and the first curved surface 311 and the third curved surface 211, and increase the maximum axial external force that the clutch can withstand.

[0044] It can be understood that the first curved surface 311, the second curved surface 110 and the third curved surface 211 can also be elliptical surfaces, the roller 310 can be made into an elliptical cylinder with a large radius in the middle and small radii at both ends, when subjected to an axial external force, the small radius parts at both ends of the roller 310 play a limiting role, and have a large frictional resistance with the second curved surface 110 and the third curved surface 211; the roller 310 can also be made into a cone, etc., which meets the use requirements of the clutch.

[0045] It can be understood that the first curved surface 311 and the second curved surface 110 and the first curved surface 311 and the third curved surface 211 have a long fitting curve, and the load borne by the outer star wheel 200, the roller 310 and the inner ring 100 can be evenly distributed through the long fitting curve and the large fitting area, which is beneficial to improve the bearing capacity between the roller 310 and the outer star wheel 200 and the inner ring 100, and increase the service life of the clutch; or, under the same bearing capacity, compared with the traditional clutch, the clutch of the first aspect of the present application can reduce the volume of the clutch while meeting the same bearing capacity, which is beneficial to reduce the occupied space of the clutch and reduce the production cost of the clutch.

[0046] It should be noted that, as shown in Figure 4 , along the axial direction of the inner ring 100, the length of the roller 310 can be less than the width of the inner ring 100 and the outer star wheel 200, the roller 310 is embedded between the inner ring 100 and the outer star wheel 200, the first curved surface 311 of the outer wall of the roller 310 is respectively matched with the second curved surface 110 of the outer wall of the inner ring 100 and the third curved surface 211 of the bottom wall of the wedge-shaped groove 210, also meet the use requirements of the clutch.

[0047] Referring to Figure 4 , Figure 6 and Figure 7 , it can be understood that the radius of the first curved surface 311 is R1, the radius of the second curved surface 110 is R2, and the radius R1 of the first curved surface 311 is equal to the radius R2 of the second curved surface 110, that is, R1=R2, at this time, the first curved surface 311 of the outer wall of the roller 310 and the second curved surface 110 of the outer wall of the inner ring 100 can be completely matched, further increase the length and area of the matched curve between the first curved surface 311 and the second curved surface 110, to improve the resistance of the first curved surface 311 and the second curved surface 110, so that the clutch can further withstand the maximum axial external force.

[0048] Referring to Figure 4 , Figure 5 and Figure 8 , it can be understood that the radius of the first curved surface 311 is R1, the radius of the third curved surface 211 is R3, and the radius R1 of the first curved surface 311 is equal to the radius R3 of the third curved surface 211, that is, R1=R3, the first curved surface 311 of the outer wall of the roller 310 and the third curved surface 211 of the inner wall of the outer star wheel 200 can be completely matched, further increase the length and area of the matched curve between the first curved surface 311 and the third curved surface 211, to improve the resistance between the first curved surface 311 and the third curved surface 211, so that the clutch can further withstand the maximum axial external force.

[0049] Referring to Figures 4 to 7 , it can be understood that from the radius direction of the inner ring 100, the distance between the center of the inner ring 100 and the roller 310 is L1, the diameter of the roller 310 is L2, and the distance L1 from the center of the inner ring 100 to the roller 310 plus the diameter L2 of the roller 310 is equal to the radius R3 of the third curved surface 211, that is, R3=L1+L2, it can be understood that the radius R3 of the third curved surface 211 coincides with or is relatively symmetrical with the center of the inner ring 100, during the installation of the roller 310, the outer ring can rotate relative to the inner ring 100, so that the installer can install the roller 310 at different positions into the retainer 300, which is beneficial to save the installation time of the roller 310.

[0050] It should be noted that when the first curved surface 311 is an outward convex curved surface, L1 can be understood as the maximum distance between the inner ring 100 and the roller 310, and L2 can be understood as the maximum diameter of the roller 310; when the first curved surface 311 is an inward concave curved surface, L1 can be understood as the minimum distance between the inner ring 100 and the roller 310, and L2 can be understood as the minimum diameter of the roller 310.

[0051] With reference to Figures 5 to 8 It can be understood that the first curved surface 311 is convex along the radial direction of the roller 310 or is concave along the radial direction of the roller 310. When the first curved surface 311 is convex outward along the radial direction of the roller 310, the first curved surface 311 of the outer wall of the roller 310 is a convex surface, at this time, the radius of the middle part of the roller 310 is large, and the radius of the two ends is small, the second curved surface 110 of the outer wall of the inner ring 100 is a concave surface, and the third curved surface 211 of the inner wall of the outer star wheel 200 is also a concave surface. When an axial external force is applied, the part with small radius at the two ends of the roller 310 plays a limiting role, and has large frictional resistance with the second curved surface 110 and the third curved surface 211. When the first curved surface 311 is concave along the radial direction of the roller 310, the first curved surface 311 of the outer wall of the roller 310 is a concave surface, at this time, the radius of the middle part of the roller 310 is small, and the radius of the two ends is large, the second curved surface 110 of the outer wall of the inner ring 100 is a convex surface, and the third curved surface 211 of the inner wall of the outer star wheel 200 is also a convex surface. When an axial external force is applied, the part with small radius in the middle of the roller 310 plays a limiting role, and has large frictional resistance with the second curved surface 110 and the third curved surface 211. The first curved surface 311 is arranged to be convex along the radial direction of the roller 310 or concave along the radial direction of the roller 310, so that the first curved surface 311 has a better arc surface curve. While increasing the resistance between the first curved surface 311, the second curved surface 110 and the third curved surface 211, the carrying capacity between the roller 310 and the outer star wheel 200 and the inner ring 100 is also improved, and the service life of the clutch is increased.

[0052] With reference to Figures 1 to 3 It can be understood that the outer wall of the retainer 300 is circumferentially spaced apart to be provided with the mounting groove 320, and the bottom of the mounting groove 320 is hollow. One roller 310 is arranged in each mounting groove 320. One side of the roller 310 passes through the hollow groove to abut against the second curved surface 110 of the outer wall of the inner ring 100, and the other side abuts against the third curved surface 211 of the bottom wall of the wedge-shaped groove 210. By axially spacing a plurality of mounting grooves 320 on the outer wall of the retainer 300 to mount the rollers 310, the rollers 310 can be effectively limited on the retainer 300, and the rollers 310 are not easy to fall off.

[0053] With reference to Figures 1 to 3It can be understood that the retainer 300 is provided with a plurality of mounting portions, the mounting grooves are arranged on the mounting portions, the elastic members 330 are arranged between the outer wall of the mounting portion and the side of the wedge-shaped groove 210, the elastic members 330 are located on the side of the wedge-shaped groove 210 away from the inner ring 100, one end of the elastic member 330 abuts against the outer wall of the retainer 300, and the other end abuts against the side of the end of the wedge-shaped groove 210 away from the inner ring 100. When the clutch is in the overrun state, the roller 310 slides along the wedge-shaped groove 210 away from the end of the inner ring 100. At this time, the elastic member 330 abutting against the outer wall of the retainer 300 can limit the relative position of the retainer 300 and the outer star wheel 200, thereby limiting the roller 310 in the wedge-shaped groove 210, and effectively preventing the phenomenon of the roller 310 falling off in the overrun state.

[0054] With reference to Figures 1 to 3 , the outer side of the mounting portion of the retainer 300 is provided with an annular surrounding edge, the surrounding edge limits the containing groove 340, the elastic member 330 is a spring, one end of the spring is arranged in the containing groove 340, and the other end abuts against the side of the wedge-shaped groove 210 away from the inner ring 100. By arranging the containing groove 340 on the outer side wall of the retainer 300 to contain the elastic member 330, the elastic member 330 can be better limited, the elastic force of the elastic member 330 can better act on the retainer 300, and in the reciprocating process of the elastic member 330, the elastic member 330 is not easy to fall off due to the limitation of the containing groove 340.

[0055] It should be noted that the elastic member 330 can be a disc spring, a cylindrical spring, a conical spring and a special-shaped spring, and the elastic member 330 can be made of metal materials such as stainless steel and 65Mn steel.

[0056] With reference to Figures 1 to 3 It can be understood that the number of the rollers 310 is three to thirty. The increase in the number of the rollers 310 is beneficial to improve the maximum axial external force that can be borne by the clutch, and can also correspondingly improve the carrying capacity of the clutch.

[0057] It can be understood that, as shown in Figure 2 and Figure 3 , the number of the rollers 310 can be six. In the process of installing the clutch, the retainer 300 is coaxially sleeved on the outer side of the inner ring 100, then four rollers 310 are symmetrically pressed into the retainer 300, the rollers 310 are installed in the wedge-shaped groove 210 at a certain angle, then the inner ring 100 is rotated and the remaining two rollers 310 are installed on the retainer 300, and finally the elastic member 330 is installed between the outer wall of the retainer 300 and the side of the wedge-shaped groove 210. After installation, the six rollers 310 are circumferentially spaced apart on the retainer 300 and can better bear the load acting on the inner ring 100 or the outer star wheel 200. The number of the rollers 310 can also be three, twelve or thirty, etc.

[0058] The deceleration mechanism of the second aspect embodiment of the present application comprises the clutch of the first aspect embodiment of the present application, the inner ring 100 of the clutch is connected with the output shaft of the driving device, and the outer star wheel 200 is connected with the driven device; by setting the outer wall of the roller 310 of the clutch as the first curved surface 311, setting the outer wall surface of the inner ring 100 as the second curved surface 110 matched with the first curved surface 311, and setting the bottom wall of the wedge-shaped groove 210 as the third curved surface 211 matched with the first curved surface 311, the first curved surface 311 of the outer wall of the roller 310 abuts against the second curved surface 110 of the outer wall of the inner ring 100 and the third curved surface 211 of the inner wall of the outer star wheel 200; when the deceleration mechanism is subjected to an axial external force, the axial external force is transmitted to the clutch; because the first curved surface 311 of the outer wall of the roller 310 abuts against the second curved surface 110 of the outer wall of the inner ring 100 and the third curved surface 211 of the inner wall of the outer star wheel 200, a relatively large resistance in the direction opposite to the axial external force received by the clutch is generated between the first curved surface 311 and the second curved surface 110, which can limit the axial movement of the roller 310 and the inner ring 100 along the axis of the inner ring 100; similarly, a relatively large resistance in the direction opposite to the axial external force received by the clutch is also generated between the first curved surface 311 and the third curved surface 211, which can limit the axial movement of the roller 310 and the outer star wheel 200 along the axis of the inner ring 100, and is beneficial to improving the safety of the clutch; and the clutch also has the self-centering function; when the coincidence degree of the center of the inner ring 100 and the center of the outer star wheel 200 is poor, the roller 310 rolls in the wedge-shaped groove 210 under the action of the external force, the first curved surface 311 of the outer wall of the roller 310 abuts against the second curved surface 110 of the outer wall of the inner ring 100 and the third curved surface 211 of the inner wall of the outer star wheel 200, so as to correspondingly adjust the relative positional relationship between the outer star wheel 200 and the inner ring 100, to adjust the coincidence degree of the center of the inner ring 100 and the center of the outer star wheel 200 within a certain range, to increase the effective contact area of the roller 310 with the inner ring 100 and the outer star wheel 200, and is beneficial to improving the service life of the clutch; the deceleration mechanism provided by the second aspect embodiment of the present application comprises the clutch, the resistance in the direction opposite to the axial external force received by the clutch generated between the first curved surface 311, the second curved surface 110 and the third curved surface 211 of the clutch can offset the axial external force received by the clutch, so that the outer star wheel 200, the roller 310 and the inner ring 100 cannot move along the axis of the inner ring 100, the roller 310 is not easy to fall off, and it is beneficial to increasing the safety and service life of the deceleration mechanism.

[0059] The electric vehicle according to the third aspect embodiment of the present application comprises the deceleration mechanism of the second aspect embodiment of the present application, the output shaft of the motor of the electric vehicle is connected with the inner ring 100 of the clutch, and the outer star wheel 200 of the clutch is connected with the deceleration mechanism to drive the rotation of the hub of the electric vehicle, and the electric vehicle has all the beneficial effects of the deceleration mechanism of the second aspect embodiment.

[0060] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A clutch, characterised in that, The clutch comprises: an inner ring; an outer star wheel, which is sleeved on the outer side of the inner ring, and the inner wall surface of the outer star wheel is circumferentially spaced with a plurality of wedge-shaped grooves; wherein, a retainer is arranged between the outer star wheel and the inner ring, the retainer is connected with a plurality of rollers, the rollers are located in the wedge-shaped grooves, and the rollers cooperate with the wedge-shaped grooves to realize one-way clutching between the inner ring and the outer star wheel; along the axial direction of the rollers, the outer wall surface of the rollers is provided as a first curved surface, the outer wall surface of the inner ring is provided as a second curved surface matched with the first curved surface, the bottom surface of the wedge-shaped groove is provided as a third curved surface matched with the first curved surface, and the first curved surface abuts against the second curved surface and the third curved surface to limit the movement of the rollers along the axial direction of the inner ring; the first curved surface, the second curved surface and the third curved surface are all arc surfaces, the radius of the first curved surface is equal to the radius of the third curved surface, and the third curved surface is arranged through along the axial direction of the outer star wheel; the retainer is provided with a plurality of mounting portions, the mounting portions are arranged at intervals along the circumferential direction of the retainer, the mounting portions are provided with mounting grooves, and one roller is arranged in each mounting groove; along the radial direction of the retainer, the mounting portions extend into the wedge-shaped grooves, elastic members are arranged between the outer wall of the mounting portions and the side surface of the wedge-shaped grooves, the outer side of the mounting portions is provided with an annular surrounding edge, the surrounding edge limits a containing groove, one end of the elastic member is arranged in the containing groove, and the other end abuts against the side surface of the wedge-shaped groove.

2. The clutch of claim 1, wherein The radius of the first curved surface is equal to the radius of the second curved surface.

3. The clutch of claim 2, wherein, Along the radial direction of the inner ring, the distance from the center of the inner ring to the roller plus the diameter of the roller is equal to the radius of the third curved surface.

4. The clutch of claim 1, wherein The first curved surface protrudes along the radial direction of the roller or is concave along the radial direction of the roller.

5. The clutch of claim 1, wherein, The number of rollers is three to thirty.

6. A reduction mechanism characterized by, The clutch comprises the clutch according to any one of claims 1 to 5.

7. An electric vehicle, characterized by The speed reduction mechanism comprises the clutch according to claim 6.

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