WO2023082791A1

WO2023082791A1 - Torque transfer structure for constant velocity universal joint transmission shaft and hub bearing unit

Info

Publication number: WO2023082791A1
Application number: PCT/CN2022/116684
Authority: WO
Inventors: 李晓天; 周许
Original assignee: 上海纳铁福传动系统有限公司
Priority date: 2021-11-11
Filing date: 2022-09-02
Publication date: 2023-05-19
Also published as: CN114033810A

Abstract

A torque transfer structure for a constant velocity universal joint transmission shaft (10) and a hub bearing unit (20). The torque transfer structure comprises a constant velocity universal joint transmission shaft (10), a hub bearing unit (20) and a friction increasing washer (30), wherein the constant velocity universal joint transmission shaft (10) comprises a shaft shoulder (11) and a shaft portion (12), which axially extends from an end of the shaft shoulder (11); the hub bearing unit (20) comprises a hub (21) and a rolling bearing (22), which is assembled on the periphery of the hub (21), the hub (21) has a hub matching barrel (211), and the hub matching barrel (211) is provided with a matching hole (212) matching the shaft portion (12); and the friction increasing washer (30) is compressed between an end surface of the shaft shoulder (11) and an end surface of the hub matching barrel (211). Torque between the shaft shoulder (11) of the constant velocity universal joint transmission shaft (10) and the hub matching barrel (211) of the hub bearing unit (20) is transferred by providing the friction increasing washer (30), such that an end-surface spline structure is omitted, the structure and manufacturing process of the present invention are simplified, the weight of parts is reduced, and abnormal noise caused by relative sliding of contact surfaces between the constant velocity universal joint transmission shaft (10) and the hub bearing unit (20) is eliminated.

Description

A Torque Transmission Structure of Constant Velocity Universal Joint Transmission Shaft and Hub Bearing Unit

technical field

The invention relates to the field of vehicle parts, in particular to a torque transmission structure of a constant velocity universal joint transmission shaft and a hub bearing unit.

Background technique

At present, the internal and external spline coupling structure is used to transmit torque between the constant velocity universal joint transmission shaft and the hub bearing unit. The internal and external spline coupling structure is usually an internal and external end face spline, such as the Chinese invention patent with the authorized announcement number CN102056752B Disclosed is a bearing device for a driving wheel. However, after long-term use of the spline fit between the inner and outer end faces, a gap will be generated between the two mating end faces. Sliding, resulting in a rattling noise.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a torque transmission structure between the constant velocity universal joint transmission shaft and the hub bearing unit, which can effectively eliminate the The abnormal sound of the vehicle starting caused by relative sliding.

In order to achieve the above object, the present invention provides a torque transmission structure of a constant velocity universal joint transmission shaft and a hub bearing unit, including a constant velocity universal joint transmission shaft and a hub bearing unit, and the constant velocity universal joint transmission shaft includes a shaft A shoulder, and a shaft extending axially from the end of the shoulder, the hub bearing unit includes a hub and a rolling bearing assembled on the outer periphery of the hub, the hub has a hub matching cylinder, and the hub fits in the cylinder A matching hole matching with the shaft part is provided; the torque transmission structure also includes a friction-increasing gasket, and the friction-increasing gasket is compressed between the end surface of the shaft shoulder part and the end surface of the hub matching cylinder part.

Preferably, the friction-enhancing pad is fixed on the end surface of the shaft shoulder.

Preferably, the friction-increasing pad is fixed on the end surface of the matching cylinder portion of the hub.

Further, the friction-increasing pad includes a soft base layer and several hard particles dispersed and attached to the soft base layer.

Preferably, the soft base layer is non-woven fabric.

Further, the Mohs hardness of the hard particles is greater than 8.0, and the particle size of the hard particles is 5-100 microns.

Preferably, the hard particles are diamonds.

Further, the area coverage of the hard particles on the soft base layer is 3%-50%.

Further, the torque transmission structure also includes a compression bolt and a lock nut threadedly connected to the compression bolt, a threaded hole is opened in the shaft part of the constant velocity universal joint transmission shaft, and a threaded hole is opened in the hub. A smooth through hole connected to the matching hole, the compression bolt is tightened in the threaded hole after passing through the smooth through hole, so that a compressive force is generated between the end surface of the shaft shoulder and the end surface of the hub matching cylinder, and the lock nut abut against the end face of the hub.

As mentioned above, the torque transmission structure of the constant velocity universal joint transmission shaft and the hub bearing unit involved in the present invention has the following beneficial effects:

In this application, the torque between the shaft shoulder of the constant velocity universal joint transmission shaft and the hub matching cylinder of the hub bearing unit is transmitted by setting the friction-increasing gasket, so that the end surface of the shaft shoulder and the hub Cooperate with the end face spline structure between the end faces of the barrel, simplify the structure of the constant velocity universal joint drive shaft and the hub, and the manufacturing process, reduce the weight of the parts, especially effectively avoid the end face of the shaft shoulder and the hub matching the barrel Relative sliding occurs between the end surfaces, thereby completely eliminating the abnormal noise caused by the relative sliding of the contact surfaces between the constant velocity universal joint transmission shaft and the hub bearing unit.

Description of drawings

Fig. 1 is a structural schematic diagram of the torque transmission structure of the constant velocity universal joint transmission shaft and the hub bearing unit in the present application.

FIG. 2 is an enlarged view of circle A in FIG. 1 .

Component designation description

10 Constant velocity universal joint transmission shaft

11 Shaft shoulder

12 shaft part

13 Threaded hole

20 wheel hub bearing unit

21 wheel hub

211 Wheel hub matching barrel

212 Mating hole

213 smooth through hole

22 Rolling bearings

30 Friction increasing pad

31 Soft base layer

32 Hard Particles

40 Compression bolts

50 lock nut

Detailed ways

The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, there is no technical substantive meaning, and any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope of the disclosure of the present invention without affecting the functions and objectives of the present invention. within the scope of technical content. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for convenience of description and are not used to limit the present invention. The practicable scope, the change or adjustment of its relative relationship, without any substantial change in the technical content, shall also be regarded as the practicable scope of the present invention.

The present application provides a torque transmission structure of a constant velocity universal joint transmission shaft 10 and a hub bearing unit 20; as shown in Figure 1 and Figure 2, the torque transmission structure includes a constant velocity universal joint transmission shaft 10, a hub bearing unit 20, And the friction pad 30. Wherein, the constant velocity universal joint transmission shaft 10 includes a shaft shoulder 11 and a shaft 12 extending axially from the end of the shaft shoulder 11; the wheel hub bearing unit 20 includes a wheel hub 21 and a rolling bearing 22 assembled on the outer periphery of the wheel hub 21 , the hub 21 has a hub matching cylinder portion 211, and the hub matching cylinder portion 211 is provided with a matching hole 212 matched with the shaft portion 12; the shaft shoulder 11, the shaft portion 12, the hub matching cylinder portion 211 and the matching hole 212 are coaxial Setting; the friction increasing pad 30 is pressed between the end surface of the shaft shoulder portion 11 and the end surface of the hub matching cylinder portion 211 , and the friction increasing pad 30 is at least one layer. In the following embodiments, the friction-increasing pad 30 is one layer.

In the above-mentioned torque transmission structure, the friction increasing pad 30 is pressed between the end surface of the shaft shoulder 11 and the end surface of the hub matching cylinder 211, and between the friction increasing pad 30 and the end surface of the shaft shoulder 11, and the friction increasing pad 30 There is friction between the friction pad 30 and the end surface of the hub matching cylinder 211, so that the constant velocity universal joint transmission shaft 10 transmits torque through the friction force generated by the friction pad 30 during the rotation process, so as to achieve The speed universal joint transmission shaft 10 drives the hub bearing unit 20 to rotate. This application adopts the friction-increasing gasket 30 to transmit the torque. There are no other structures such as splines on the constant velocity universal joint transmission shaft 10 and the hub bearing unit 20 to transmit the torque. The torque only passes through the constant velocity universal joint transmission shaft 10 and the hub bearing. The unit 20 is transmitted by the frictional force generated by the friction-enhancing pad 30 , so, compared with the prior art, the present application cancels the end surface spline structure between the end surface of the shaft shoulder 11 and the end surface of the hub fitting cylinder 211 Simplify the structure and manufacturing process of the constant velocity universal joint transmission shaft 10 and the hub 21, reduce the weight of the parts, especially effectively avoid the relative sliding between the end surface of the shaft shoulder 11 and the end surface of the hub matching cylinder 211, and then The abnormal noise caused by the relative sliding of the contact surfaces between the constant velocity universal joint transmission shaft 10 and the hub bearing unit 20 is completely eliminated.

Further, the friction-increasing pad 30 can be fixedly attached to the end surface of the shaft shoulder portion 11; or, the friction-increasing pad 30 can be fixedly attached to the end surface of the hub matching cylinder portion 211; The way exists independently, that is, it is not attached to the end surface of the shaft shoulder portion 11 , nor is it attached to the end surface of the hub fitting cylinder portion 211 .

Further, as shown in FIG. 1 , the torque transmission structure also includes a compression bolt 40 and a lock nut 50 threadedly connected to the compression bolt 40 , and a threaded hole 13 is opened in the shaft portion 12 of the constant velocity universal joint transmission shaft 10 The hub 21 is provided with a smooth through hole 213 communicating with the fitting hole 212, and the compression bolt 40 is tightened in the threaded hole 13 after passing through the smooth through hole 213, so that the end face of the shaft shoulder 11 and the end face of the hub 211 are matched. A pressing force is generated between them, and the lock nut 50 abuts against the end surface of the hub 21 . In this way, after the compression bolt 40 is screwed into the threaded hole 13 of the shaft portion 12, a compression force can be generated between the end surface of the shaft shoulder portion 11 and the end surface of the hub matching cylinder portion 211, and the friction pad can be reliably tightened. Frictional force is generated between the plate 30 and the end surface of the shoulder portion 11 , and between the friction-increasing washer 30 and the end surface of the hub matching cylinder portion 211 , and torque is finally reliably transmitted.

Further, as shown in FIG. 2 , the friction-increasing pad 30 includes a soft base layer 31 and several hard particles 32 scattered and attached to the soft base layer 31 . In the present embodiment, the soft matrix layer 31 is a non-woven fabric, which is used as the carrier of several dispersed hard particles 32; the hard particles 32 are abrasive grade particles, and the Mohs hardness of the hard particles 32 is greater than 8.0, and the hard particles The particle size of 32 is 5-100 microns; the hard particle 32 is preferably diamond. In addition, the area coverage of the hard particles 32 on the soft base layer 31 is 3%-50%. In this way, when the end surface of the shaft shoulder 11 and the end surface of the hub matching cylinder 211 are pressed against each other, the hard particles 32 can be embedded in the end surface of the shaft shoulder 11 and the end surface of the hub matching cylinder 211, which can be understood microscopically Both the hard particles 32 and the end face of the shaft shoulder 11, and the end faces of the hard particles 32 and the hub matching cylinder 211 are in serrated engagement, which greatly improves the reliability of torque transmission and ensures the stable and reliable operation of the torque transmission structure .

To sum up, the present invention effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims

A torque transmission structure of a constant velocity universal joint transmission shaft and a hub bearing unit, comprising a constant velocity universal joint transmission shaft (10) and a hub bearing unit (20), the constant velocity universal joint transmission shaft (10) comprising A shaft shoulder (11), and a shaft portion (12) axially extending from the end of the shaft shoulder (11), the hub bearing unit (20) includes a hub (21), and is assembled on the outer periphery of the hub (21) rolling bearing (22), the hub (21) has a hub fitting cylinder (211), and a fitting hole (212) matching the shaft portion (12) is opened in the hub fitting cylinder (211), the feature In that: the torque transmission structure further includes a friction-increasing pad (30), and the friction-increasing pad (30) is pressed between the end surface of the shaft shoulder (11) and the end surface of the hub matching cylinder (211) .
The torque transmission structure according to claim 1, characterized in that the friction-increasing pad (30) is fixed on the end surface of the shaft shoulder (11).
The torque transmission structure according to claim 1, characterized in that: the friction-increasing pad (30) is fixed on the end surface of the hub fitting cylinder (211).
The torque transmission structure according to any one of claims 1-3, characterized in that: the friction-increasing gasket (30) comprises a soft base layer (31), and several particles dispersed and attached to the soft base layer (31) ) on hard particles (32).
The torque transmission structure according to claim 4, characterized in that: the soft base layer (31) is non-woven fabric.
The torque transmission structure according to claim 4, characterized in that: the Mohs hardness of the hard particles (32) is greater than 8.0, and the particle size of the hard particles (32) is 5-100 microns.
The torque transmission structure according to claim 6, characterized in that the hard particles (32) are diamonds.
The torque transmission structure according to claim 4, characterized in that: the area coverage of the hard particles (32) on the soft base layer (31) is 3%-50%.
The torque transmission structure according to claim 1, characterized in that it further comprises a compression bolt (40) and a lock nut (50) threadedly connected to the compression bolt (40), the constant velocity universal joint transmission shaft A threaded hole (13) is provided in the shaft portion (12) of (10), a smooth through hole (213) communicating with the matching hole (212) is provided in the hub (21), and the pressing bolt (40) After passing through the smooth through hole (213), it is tightened in the threaded hole (13), so that a compressive force is generated between the end face of the shaft shoulder (11) and the end face of the hub matching cylinder (211), and the lock nut ( 50) abut against the end face of the hub (21).