Connecting device of outer constant velocity universal joint and wheel hub bearing unit and torque transmission method

Abstract

The present invention discloses a coupling device for an outer constant velocity joint and a wheel hub bearing unit, and a torque transmission method. The wheel hub bearing unit includes a wheel hub outer ring and a wheel hub inner ring. The wheel hub inner ring has a conical center hole. A protrusion is provided at the end of the outer constant velocity joint. The outer surface of the protrusion is a conical outer surface that matches the inner surface of the conical center hole. The protrusion is inserted into the center hole of the wheel hub inner ring. A friction-enhancing structure is provided between the conical outer surface and the inner surface of the center hole. The end of the outer constant velocity joint and the wheel hub inner ring are locked by a locking member, so that the conical outer surface and the inner surface of the conical center hole are tightly fitted to form a conical surface. The present invention can eliminate the commonly used internal and external spline matching structure, simplify the component structure, reduce the component weight, and eliminate noise caused by relative sliding between the end face of the wheel hub bearing unit and the end face of the outer constant velocity joint.

Description

Technical Field

[0001] The present invention belongs to the technical field of passenger vehicle production and manufacturing, and particularly relates to a connection device for an outboard constant velocity universal joint and a wheel hub bearing unit, and a torque transmission method. Background Art

[0002] In a passenger car, the constant velocity drive shaft 2 is located between the powertrain 1 and the wheels 3. The function of the constant velocity drive shaft 2 is to transfer power from the powertrain 1 to the wheels 3. Figure 1 The constant velocity transmission shaft 2 generally has an outer constant velocity universal joint 21 and an inner constant velocity universal joint 22, wherein the inner constant velocity universal joint 22 is connected to the powertrain 1, and the outer constant velocity universal joint 21 is connected to the hub bearing unit 31, see Figure 2 .

[0003] like Figure 3 As shown, generally the outer constant velocity joint has an outer spline, and the hub bearing unit has an inner spline. The torque is transmitted between the two through the connection of the inner spline and the outer spline. When the fit between the inner spline and the outer spline produces a gap due to long-term use, the end face of the hub bearing unit and the end face of the outer constant velocity joint, which are pressed against each other, will slide relative to each other under the action of torque, thereby generating abnormal noise.

[0004] Chinese patent CN107269686B discloses a wheel hub bearing unit configured for installation on a steering knuckle of a suspension, and Chinese patent CN111120519A discloses a wheel hub bearing unit. Both patents propose an integrated wheel hub bearing constant velocity universal joint structure, both of which eliminate abnormal noise caused by gaps, but the parts structure is complex and the manufacturing process is difficult.

[0005] Chinese patent CN103939463B discloses a wheel bearing device. The patent proposes a method of directly pressing the hard external spline on the outer constant velocity universal joint into the inner hole of the wheel hub bearing unit. This method can eliminate the clearance of the spline fit, but has high requirements on the size and material hardness of the parts, and the manufacturing and assembly process is difficult.

[0006] Chinese patent CN102056752B discloses a bearing device for a drive wheel. The patent proposes a toothed structure between the end face of the hub bearing unit and the end face of the outer constant velocity joint. Torque is transmitted through the meshing of the end face teeth. This method can eliminate the relative sliding between the two end faces, but the end face toothed structure has a complex shape and is difficult to process. Summary of the Invention

[0007] In order to address the defects existing in the prior art, the present invention provides a connection device for an outboard constant velocity universal joint and a hub bearing unit and a torque transmission method, which can eliminate the commonly used internal and external spline matching structure, simplify the part structure, reduce the part weight, and eliminate the noise caused by the relative sliding between the end face of the hub bearing unit and the end face of the outboard constant velocity universal joint.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] A connection device between an outer constant velocity joint and a wheel hub bearing unit, wherein the wheel hub bearing unit comprises a wheel hub outer ring and a wheel hub inner ring, the wheel hub inner ring having a conical center hole, a protruding block being provided at the end of the outer constant velocity joint, the outer surface of the protruding block being a conical outer surface adapted to the inner surface of the conical center hole, the protruding block being inserted into the center hole of the wheel hub inner ring, a friction-increasing structure being provided between the conical outer surface and the inner surface of the center hole, the end of the outer constant velocity joint being locked to the wheel hub inner ring by a locking piece, so that the conical outer surface and the inner surface of the conical center hole are tightly fitted to form a conical surface.

[0010] Furthermore, the inner surface of the left portion of the center hole is a cylindrical inner surface, and the inner surface of the right portion is a conical inner surface with the cone tip facing left; and the friction-increasing structure is a friction-increasing gasket.

[0011] Furthermore, the locking member includes a limit plate with a through hole in the middle, and also includes a locking bolt or a locking nut, and the limit plate is arranged on the left end face of the inner ring of the wheel hub; the inner ring of the wheel hub and the outer end of the constant velocity universal joint are locked by the cooperation of the locking bolt and the limit plate, or the inner ring of the wheel hub and the outer end of the constant velocity universal joint are locked by the cooperation of the locking nut and the limit plate.

[0012] Furthermore, the inner ring of the wheel hub and the outer end of the constant velocity universal joint are locked by the cooperation of the locking bolt and the limit plate. Specifically, a horizontal internal threaded hole is provided in the middle of the protruding block, and the locking bolt is used to pass through the through hole and the left part of the center hole of the inner ring of the wheel hub in sequence and be screwed into the internal threaded hole.

[0013] Furthermore, the inner ring of the wheel hub and the outer end of the constant velocity universal joint are locked by the cooperation of the locking nut and the limit plate. Specifically, a screw protruding to the left is provided in the middle of the left end of the protruding block, and the screw passes through the left part of the center hole of the inner ring of the wheel hub and the through hole in sequence. The locking nut is used to be screwed onto the screw on the left side of the limit plate.

[0014] Furthermore, the friction-increasing gasket is fixed on the conical inner surface or the conical outer surface.

[0015] Furthermore, the friction-increasing pad includes a soft base layer and hard particles dispersed and attached to the soft base layer.

[0016] Furthermore, the hard particles have a Mohs hardness greater than 7.0, a size range of 5-150 μm, and an area coverage range of 5-50%.

[0017] Furthermore, the cone angle of the conical inner surface ranges from 16° to 120°.

[0018] A method for transmitting torque between an outboard constant velocity joint and a hub bearing unit, using the above-mentioned coupling device between the outboard constant velocity joint and the hub bearing unit to transmit torque, comprises the following steps:

[0019] S1. Insert the protruding block at the end of the outer constant velocity universal joint into the right part of the center hole of the inner ring of the wheel hub, with the friction-increasing gasket located between the conical outer surface and the conical inner surface;

[0020] S2. Use the locking piece to lock the outer constant velocity joint end with the inner ring of the wheel hub, so that the conical outer surface and the conical inner surface are tightly fitted to form a conical surface, and the torsional torque is transmitted from the outer constant velocity joint to the wheel hub bearing unit.

[0021] Furthermore, in step S2, the locking member is used to lock the outer constant velocity universal joint end and the inner ring of the wheel hub. Specifically, the limit plate of the locking member is placed on the left end face of the inner ring of the wheel hub, and the locking bolt of the locking member is passed through the through hole of the limit plate and the left part of the center hole of the inner ring of the wheel hub in sequence and screwed into the internal threaded hole of the protruding block, so that an extrusion force is generated between the conical outer surface and the conical inner surface, and the hard particles on the friction-increasing gasket are pressed into the conical outer surface and the conical inner surface.

[0022] Furthermore, in step S2, the locking member is used to lock the outer constant velocity universal joint end and the inner ring of the wheel hub. Specifically, the limiting plate of the locking member is passed through the screw of the protruding block and is placed on the left end face of the inner ring of the wheel hub, and the locking nut of the locking member is screwed onto the screw on the left side of the limiting plate, so that an extrusion force is generated between the conical outer surface and the conical inner surface, and the hard particles on the friction-increasing gasket are pressed into the conical outer surface and the conical inner surface.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The outer constant velocity universal joint and the wheel hub bearing unit connection device of the present invention, the wheel hub bearing unit includes a wheel hub outer ring and a wheel hub inner ring, the wheel hub inner ring has a conical center hole, the outer end of the outer constant velocity universal joint is provided with a protruding block, the outer surface of the protruding block is a conical outer surface adapted to the inner surface of the conical center hole, the protruding block is inserted into the center hole of the wheel hub inner ring, a friction-increasing structure is provided between the conical outer surface and the inner surface of the center hole, the outer end of the outer constant velocity universal joint and the wheel hub inner ring are locked by a locking piece, so that the conical outer surface and the inner surface of the conical center hole are closely fitted to form a conical surface; in this way, the magnification effect of the wedge structure caused by the conical surface is utilized. By using the locking member, the locking force generated by the locking member along the direction of the rotation axis of the outer constant velocity universal joint can be converted into an extrusion pressure of the conical surface. Due to the magnifying effect of the conical surface, by reasonably selecting the value of the cone angle of the conical surface, the smaller locking torque of the locking member can be used to generate a large extrusion pressure between the conical outer surface and the inner surface of the conical center hole. Under the extrusion force and the friction-increasing effect of the friction-increasing structure, a large torsional torque can be transmitted from the outer constant velocity universal joint to the hub bearing unit. By adopting the above method, while transmitting torque, the noise generated by the relative sliding between the end face of the outer constant velocity universal joint and the end face of the hub bearing unit is eliminated.

[0025] In the present invention, the locking member includes a limit plate with a through hole in the middle, and a locking bolt or a locking nut. The limit plate is disposed against the left end surface of the inner ring of the wheel hub. A horizontal internal threaded hole is disposed in the middle of the protruding block, and the locking bolt is used to sequentially pass through the through hole and the left portion of the center hole of the inner ring of the wheel hub and be screwed into the internal threaded hole. Alternatively, a screw protruding leftward is disposed in the middle of the left end of the protruding block, and the screw sequentially passes through the left portion of the center hole of the inner ring of the wheel hub and the through hole, and the locking nut is used to be screwed onto the screw on the left side of the limit plate. In this way, by utilizing the amplifying effect of the wedge-shaped structure caused by the conical surface, the locking force generated by the locking bolt or the locking nut along the rotation axis of the outer constant velocity universal joint can be converted into an extrusion force of the conical surface. Due to the amplifying effect of the conical surface, by reasonably selecting the value of the cone angle of the conical surface, a relatively small tightening torque of the locking bolt or the locking nut can be used to generate a large extrusion force between the conical outer surface and the conical inner surface.

[0026] In the present invention, the friction-increasing gasket is fixed on the conical inner surface or the conical outer surface; when the friction-increasing gasket is fixed on the conical inner surface, during the process of inserting the protruding block at the end of the outer constant velocity universal joint into the right part of the center hole of the inner ring of the wheel hub, the position of the friction-increasing gasket will not change relative to the conical inner surface; when the friction-increasing gasket is fixed on the conical outer surface, during the process of inserting the protruding block at the end of the outer constant velocity universal joint into the right part of the center hole of the inner ring of the wheel hub, the position of the friction-increasing gasket will not change relative to the conical outer surface, thereby facilitating the connection between the protruding block and the center hole of the inner ring of the wheel hub.

[0027] In the present invention, the friction-increasing gasket includes a soft base layer and hard particles attached to and dispersed on the soft base layer; thus, under the action of the extrusion force, the hard particles of the friction-increasing gasket are pressed into the conical surface, thereby transmitting a large torsional torque from the outer constant velocity joint to the hub bearing unit, and eliminating the noise generated by relative sliding between the end face of the outer constant velocity joint and the end face of the hub bearing unit.

[0028] In summary, the present invention eliminates the spline structure of the hub bearing unit and the outer constant velocity universal joint, simplifies the structure and manufacturing process, reduces the weight of parts, and completely eliminates the abnormal noise caused by relative sliding between the end face of the hub bearing unit and the end face of the outer constant velocity universal joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the relationship between an automobile powertrain and a constant velocity drive shaft in the background art;

[0030] Figure 2 A schematic diagram of the relationship between a medium-speed transmission shaft and a hub bearing unit in the background art;

[0031] Figure 3 Schematic diagram of the connection and torque transmission method between a conventional constant velocity joint and a hub bearing unit in the background art;

[0032] Figure 4 Schematic diagram of the structure of the hub bearing unit in the present invention;

[0033] Figure 5 It is a structural diagram of an outer constant velocity universal joint with an internal threaded hole;

[0034] Figure 6 It is a structural schematic diagram of an outer constant velocity universal joint with a screw;

[0035] Figure 7 A schematic diagram of the structure connecting the outer constant velocity joint to the wheel hub bearing unit via locking bolts and friction-increasing washers;

[0036] Figure 8 A schematic diagram of the structure connecting the outer constant velocity joint to the wheel hub bearing unit through a locking nut and a friction-increasing washer;

[0037] Figure 9 Schematic diagram of the structure of the friction-increasing gasket.

[0038] Explanation of the reference numerals in the figures: 1. power assembly, 2. constant velocity drive shaft, 21. outer constant velocity joint, 211. protruding block, 212. conical outer surface, 213. internal threaded hole, 214. screw, 22. inner constant velocity joint, 3. wheel, 31. hub bearing unit, 311. hub inner ring, 312. conical inner surface, 313. cylindrical inner surface, 314. hub outer ring, 41. locking bolt, 42. locking nut, 43. limiting plate, 5. friction-increasing gasket, 51. soft matrix layer, 52. hard particles, 6. brake disc, 7. hub bearing, 8. steering knuckle, 9. hub bolt, 10. hub, 11. constant velocity joint connecting nut. DETAILED DESCRIPTION

[0039] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "transverse," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0042] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0043] A device for connecting an outboard constant velocity universal joint to a hub bearing unit, such as Figure 4 As shown, the hub bearing unit 31 includes a hub outer ring 314 and a hub inner ring 311. The inner surface of the left portion of the center hole of the hub inner ring 311 is a cylindrical inner surface 313, and the inner surface of the right portion is a conical inner surface 312 with the cone tip facing left. Figure 5-6As shown, a protruding block 211 is provided at the end of the outer constant velocity universal joint 21, and the outer surface of the protruding block 211 is a conical outer surface 212 adapted to the conical inner surface 312, as shown in FIG. Figure 7-8 As shown, the protruding block 211 is inserted into the right part of the center hole of the hub inner ring 311, and a friction-increasing gasket 5 is provided between the conical outer surface 212 and the conical inner surface 312. The end of the outer constant velocity joint 21 is locked with the hub inner ring 311 by a locking piece, so that the conical outer surface 212 and the conical inner surface 312 are tightly fitted to form a conical surface, and the cone angle A of the conical surface is in the range of 16-120°.

[0044] Among them, such as Figure 7 and 8 As shown, the locking force generated by the locking member along the rotation axis direction of the outer constant velocity universal joint 21 is recorded as F1, the extrusion force between the conical outer surface 212 and the conical inner surface 312 is recorded as F2, the friction force between the conical outer surface 212 and the conical inner surface 312 is recorded as f, and the friction coefficient between the conical outer surface 212 and the conical inner surface 312 is recorded as μ, then

[0045]

[0046] Therefore, by utilizing the amplification effect of the wedge structure caused by the conical surface, the locking force F1 generated by the locking member along the rotation axis of the outer constant velocity universal joint 21 can be converted into the extrusion force F2 of the conical surface. Due to the amplifying effect of the conical surface, by reasonably selecting the value of the conical angle A of the conical surface, a large extrusion pressure between the conical outer surface 212 and the conical inner surface 312 can be generated by using a small locking torque of the locking member. Under the action of the extrusion pressure, the friction-increasing gasket 5 is pressed into the conical surface, so that a large torsional torque can be transmitted from the outer constant velocity joint 21 to the hub bearing unit 31. By adopting the above method, while transmitting torque, the noise generated by the relative sliding between the end face of the outer constant velocity joint 21 and the end face of the hub bearing unit 31 is eliminated.

[0047] Among them, such as Figure 7-8 As shown, the locking member includes a limit plate 43 with a through hole in the middle, and also includes a locking bolt 41 or a locking nut 42. The limit plate 43 is arranged on the left end face of the inner ring 311 of the wheel hub; the inner ring 311 of the wheel hub and the end of the outer constant velocity universal joint 21 are locked by the cooperation of the locking bolt 41 and the limit plate 43, or the inner ring 311 of the wheel hub and the end of the outer constant velocity universal joint 21 are locked by the cooperation of the locking nut 42 and the limit plate 43.

[0048] In one embodiment, a horizontal internal threaded hole 213 is provided in the middle of the protruding block 211, and the locking bolt 41 is used to sequentially pass through the through hole and the left part of the center hole of the hub inner ring 311 and be screwed into the internal threaded hole 213. Figure 7 In another embodiment, a screw rod 214 is provided at the middle of the left end of the protruding block 211, which protrudes to the left. The screw rod 214 passes through the left part of the center hole of the inner ring 311 of the wheel hub and the through hole in sequence. The locking nut 42 is used to be screwed onto the screw rod 214 on the left side of the limiting plate 43. Figure 8 By utilizing the magnifying effect of the wedge-shaped structure caused by the conical surface, the locking force generated by the locking bolt 41 or the locking nut 42 along the rotation axis of the outer constant velocity universal joint 21 can be converted into an extrusion force of the conical surface. Due to the magnifying effect of the conical surface, by properly selecting the value of the conical surface angle, a relatively small tightening torque of the locking bolt 41 or the locking nut 42 can be used to generate a large extrusion force between the conical outer surface 212 and the conical inner surface 312.

[0049] The friction-increasing gasket 5 is fixed on the conical inner surface 312 or the conical outer surface 212 , which facilitates the insertion of the protruding block 211 into the center hole of the hub inner ring 311 ; alternatively, the friction-increasing gasket 5 exists as a separate component.

[0050] Among them, such as Figure 9 As shown, the friction-increasing pad 5 includes a soft base layer 51 and hard particles 52 attached to and dispersed on the soft base layer 51. The hard particles 52 have a Mohs hardness greater than 7.0, a size range of 5-150 μm, and an area coverage range of 5-50%. By selecting hard particles 52 with a Mohs hardness greater than 7.0 and a size range of 5-150 μm, the hard particles 52 can be better pressed into the conical surface under the action of the extrusion force. Moreover, since the area coverage range of the hard particles 52 is between 5-50%, the adhesion between the conical outer surface 212 and the conical inner surface 312 can be fully increased, thereby transmitting a larger torsional torque from the outer constant velocity joint 21 to the hub bearing unit 31, and eliminating the noise generated by the relative sliding between the end faces of the outer constant velocity joint 21 and the hub bearing unit 31.

[0051] A method for transmitting torque between an outboard constant velocity joint and a hub bearing unit, using the above-mentioned coupling device between the outboard constant velocity joint and the hub bearing unit to transmit torque, comprises the following steps:

[0052] S1. Insert the protruding block 211 at the end of the outer constant velocity universal joint 21 into the right part of the center hole of the hub inner ring 311, with the friction-increasing gasket 5 located between the conical outer surface 212 and the conical inner surface 312;

[0053] S2. Use a locking piece to lock the end of the outer constant velocity joint 21 with the wheel hub inner ring 311, so that the conical outer surface 212 and the conical inner surface 312 fit tightly together, and transmit the torsional moment from the outer constant velocity joint 21 to the wheel hub bearing unit 31.

[0054] In one embodiment, in step S2, a locking member is used to lock the end of the outer constant velocity universal joint 21 to the inner ring 311 of the hub. Specifically, the limit plate 43 is placed on the left end face of the inner ring 311 of the hub, and the locking bolt 41 is passed through the through hole of the limit plate 43 and the left part of the center hole of the inner ring 311 of the hub in sequence and screwed into the internal threaded hole 213 of the protruding block 211, so that an extrusion force is generated between the conical outer surface 212 and the conical inner surface 312, and the hard particles 52 on the friction-increasing gasket 5 are pressed into the conical outer surface 212 and the conical inner surface 312.

[0055] In another embodiment, in step S2, a locking member is used to lock the end of the outer constant velocity joint 21 to the inner ring 311 of the hub. Specifically, the limit plate 43 is passed through the screw 214 of the protruding block 211 and is placed on the left end face of the inner ring 311 of the hub, and the locking nut 42 is screwed onto the screw 214 on the left side of the limit plate 43, so that an extrusion force is generated between the conical outer surface 212 and the conical inner surface 312, and the hard particles 52 on the friction-increasing gasket 5 are pressed into the conical outer surface 212 and the conical inner surface 312.

[0056] In summary, the present invention can convert the locking force F1 generated by the locking bolt 41 or the locking nut 42 along the rotation axis of the outer constant velocity universal joint 21 into the extrusion force F2 of the conical surface by utilizing the amplification effect of the wedge structure caused by the conical surface. Due to the magnifying effect of the conical surface, by reasonably selecting the value of the conical angle A of the conical surface, a large extrusion pressure between the conical outer surface 212 and the conical inner surface 312 can be generated by using a small tightening torque of the locking bolt 41 or the locking nut 42. Under the action of the extrusion pressure, the hard particles 52 of the friction-increasing gasket 5 are pressed into the conical surface, so that a large torsional torque can be transmitted from the outer constant velocity joint 21 to the hub bearing unit 31. By adopting the above method, while transmitting torque, the noise generated by the relative sliding between the end face of the outer constant velocity joint 21 and the end face of the hub bearing unit 31 is eliminated.

[0057] In the present invention, torque is transmitted through the friction between the conical outer surface 212 of the outer constant velocity universal joint 21 and the conical inner surface 312 of the hub bearing unit 31. Therefore, the commonly used matching structure of the inner spline of the end face of the hub bearing unit 31 and the outer spline of the end face of the outer constant velocity universal joint 21 can be eliminated, the part structure is simplified, the part weight is reduced, and the noise caused by the relative sliding between the end face of the hub bearing unit 31 and the end face of the outer constant velocity universal joint 21 can be eliminated.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A device for connecting an outboard constant velocity universal joint to a hub bearing unit, wherein the hub bearing unit (31) comprises a hub outer ring (314) and a hub inner ring (311), characterized in that: The wheel hub inner ring (311) has a conical center hole, and the end of the outer constant velocity universal joint (21) is provided with a protruding block (211). The outer surface of the protruding block (211) is a conical outer surface (212) adapted to the conical inner surface of the center hole. The protruding block (211) is inserted into the center hole of the wheel hub inner ring (311). The inner surface of the left part of the center hole is a cylindrical inner surface (313), and the inner surface of the right part is a conical inner surface (312) with the cone tip facing left. A friction-increasing structure is provided between the conical outer surface (212) and the inner surface of the center hole. The end of the outer constant velocity universal joint (21) is locked with the wheel hub inner ring (311) by a locking member. The locking member comprises a limit plate (43) with a through hole in the middle and a locking bolt (41), the limit plate (43) being arranged on the left end face of the wheel hub inner ring (311), a horizontal internal threaded hole (213) being arranged in the middle of the protruding block (211), and the locking bolt (41) being used to sequentially pass through the through hole and the left part of the center hole of the wheel hub inner ring (311) and be screwed into the internal threaded hole (213); The cone angle of the conical inner surface (312) ranges from 16° to 120°.

2. The device for connecting an outboard constant velocity universal joint to a hub bearing unit according to claim 1, characterized in that: The friction-increasing structure is a friction-increasing gasket (5).

3. The device for connecting an outboard constant velocity universal joint to a hub bearing unit according to claim 2, characterized in that: The locking member includes a limiting plate (43) with a through hole in the middle and a locking nut (42), wherein the limiting plate (43) is arranged on the left end surface of the inner ring of the wheel hub (311), and a screw rod (214) protruding to the left is provided in the middle of the left end of the protruding block (211), and the screw rod (214) passes through the left part of the center hole and the through hole of the inner ring of the wheel hub (311) in sequence, and the locking nut (42) is used to be screwed onto the screw rod (214) on the left side of the limiting plate (43).

4. The device for connecting an outboard constant velocity universal joint to a hub bearing unit according to claim 2, characterized in that: The friction-increasing gasket (5) is fixed on the conical inner surface (312) or the conical outer surface (212).

5. The device for connecting an outboard constant velocity universal joint to a hub bearing unit according to claim 2, characterized in that: The friction-increasing pad (5) comprises a soft base layer (51) and hard particles (52) attached to and dispersed on the soft base layer (51).

6. The device for connecting an outboard constant velocity universal joint to a hub bearing unit according to claim 5, characterized in that: The hard particles (52) have a Mohs hardness greater than 7.0, a size range of 5-150 μm, and an area coverage range of 5-50%.

7. A method for transmitting torque between an outboard constant velocity joint and a hub bearing unit, wherein the method comprises: The following steps are involved: S1. Insert the protruding block (211) at the end of the outer constant velocity universal joint (21) into the right portion of the center hole of the wheel hub inner ring (311), with the friction-increasing gasket (5) located between the conical outer surface (212) and the conical inner surface (312); S2. Using the locking member to lock the end of the outer constant velocity universal joint (21) with the inner ring of the wheel hub (311), so that the conical outer surface (212) and the conical inner surface (312) are tightly fitted together to form a conical surface, and the torsional moment is transmitted from the outer constant velocity universal joint (21) to the wheel hub bearing unit (31).

8. The torque transmission method of an outboard constant velocity universal joint and a hub bearing unit according to claim 7, characterized in that: In step S2, the locking member is used to lock the end of the outer constant velocity universal joint (21) with the inner ring of the wheel hub (311), specifically, the limiting plate (43) of the locking member is placed against the left end surface of the inner ring of the wheel hub (311), and the locking bolt (41) of the locking member is sequentially passed through the through hole of the limiting plate (43) and the left part of the center hole of the inner ring of the wheel hub (311) and screwed into the internal threaded hole (213) of the protruding block (211), so that an extrusion force is generated between the conical outer surface (212) and the conical inner surface (312), and the hard particles (52) on the friction-increasing gasket (5) are pressed into the conical outer surface (212) and the conical inner surface (312).

9. The method for transmitting torque between an outboard constant velocity universal joint and a hub bearing unit according to claim 7, wherein: In step S2, the locking member is used to lock the end of the outer constant velocity universal joint (21) with the inner ring of the wheel hub (311). Specifically, the limiting plate (43) of the locking member is passed through the screw (214) of the protruding block (211) and is placed on the left end surface of the inner ring of the wheel hub (311). The locking nut (42) of the locking member is screwed onto the screw (214) on the left side of the limiting plate (43), so that an extrusion force is generated between the conical outer surface (212) and the conical inner surface (312), and the hard particles (52) on the friction-increasing gasket (5) are pressed into the conical outer surface (212) and the conical inner surface (312).

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