CN115681350A

CN115681350A - Connecting structure of driving shaft and hub of electric vehicle

Info

Publication number: CN115681350A
Application number: CN202211335777.4A
Authority: CN
Inventors: 彭宜爱; 李海亮; 杜加云; 罗世成; 姚学森; 胡俊生; 杨栋; 左炜晨
Original assignee: Anhui Jianghuai Automobile Group Corp
Current assignee: Anhui Jianghuai Automobile Group Corp
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-02-03

Abstract

The invention discloses a connecting structure of a driving shaft and a hub of an electric vehicle, which comprises a driving shaft handle (1) and the hub (2), wherein the hub (2) is arranged on the driving shaft handle (1), an expansion cone (3) is sleeved on the driving shaft handle (1), the inner wall of the expansion cone (3) is in friction connection with the outer wall of the driving shaft handle (1), the outer wall of the expansion cone (3) is in friction connection with the inner wall of the mounting hole in the hub (2), a mounting surface (4) is arranged at one end of the driving shaft handle (1), and a self-locking nut (5) is mounted at the other end of the driving shaft handle (1). The invention can solve the problems of abnormal sound when the torque is suddenly increased and the problem that the hub nut is easy to loosen.

Description

Connecting structure of driving shaft and hub of electric vehicle

Technical Field

The invention relates to a connecting structure of a driving shaft and a hub, in particular to a connecting structure of a driving shaft and a hub of an electric vehicle.

Background

In the prior art, a driving shaft of an electric vehicle is connected with a hub by a spline, and the structure of the driving shaft is shown in fig. 1 and comprises a driving shaft handle 100, a hub 101, a driving shaft self-locking nut 102 and a hub bearing 103.

The driving shaft shank 100 is formed with an external spline at a portion thereof, an internal spline groove is formed in the mounting hole of the hub 101, the driving shaft shank 100 is inserted into the mounting hole of the hub 101, and the two are spline-fitted, and assembling a driving shaft self-locking nut 102 to the tail end of the driving shaft handle 100 until the end surface of the driving shaft handle 100 is attached to a hub bearing 103, and screwing the driving shaft self-locking nut 102 to a specified torque to complete installation. In the torque transmission process, the driving shaft inputs torque from the left side, and theoretically, if the spline is in zero clearance fit, the torque is completely transmitted from the driving shaft handle to the hub 101 through the spline connection. However, for convenience of assembly and maintenance, a fit clearance exists between the splines on the drive shaft shank 100 and the internal splines of the hub 101, the side clearance range of the splines is usually set to 0.15-0.01mm, when an input torque is transmitted to the drive shaft shank, the drive shaft shank needs to rotate by a certain angle to overcome the side clearance between the internal spline teeth and the external spline teeth, in the process, when the spline teeth are meshed, impact abnormal sound is generated, and the phenomenon is that when the wheel rim has 'click' abnormal sound in a starting working condition. Especially, in the case of an electric vehicle, the torque suddenly increases under the condition of low speed and high torque, and the problems are further caused. In addition, when the input torque is increased suddenly, the friction end surfaces of the hub bearing 103 and the self-locking nut 102 are not enough to transmit large torque, so that the self-locking nut 102 is easy to loosen, although the nylon self-locking nut is arranged, the nut still can loosen and cannot provide axial force, the axial locking force of the hub bearing 103 is caused to fail, and the hub bearing 103 fails. Especially, in the case of an electric vehicle, the torque suddenly increases under the condition of low speed and high torque, and the problems are further caused.

Disclosure of Invention

The invention aims to provide a connecting structure of a driving shaft and a hub of an electric vehicle, which aims to solve the technical problems in the prior art and can solve the problems of abnormal sound and easy loosening of a hub nut when the torque is suddenly increased.

The invention provides a connecting structure of a driving shaft and a hub of an electric vehicle, which comprises a driving shaft handle and the hub, wherein the hub is arranged on the driving shaft handle, an expansion cone is sleeved on the driving shaft handle, the inner wall of the expansion cone is in friction connection with the outer wall of the driving shaft handle, the outer wall of the expansion cone is in friction connection with the inner wall of the mounting hole in the hub, a mounting surface is arranged at one end of the driving shaft handle, and a self-locking nut is mounted at the other end of the driving shaft handle.

In the aforementioned connection structure between the electric vehicle drive shaft and the hub, it is preferable that a hub bearing is attached to one end of the hub close to the attachment surface, and one end of the hub bearing abuts against the attachment surface.

In the foregoing connection structure of the electric vehicle drive shaft and the wheel hub, preferably, the drive shaft handle is sleeved with a return spring, one end of the return spring abuts against the mounting surface, and the other end of the return spring abuts against one end of the expansion cone.

In the aforementioned connection structure between the driving shaft and the hub of the electric vehicle, preferably, the material of the hub is 55 steel, the material of the driving shaft handle is 55 steel, and the material of the expansion cone is 40Cr.

In the connection structure of the driving shaft and the wheel hub of the electric vehicle, preferably, the driving shaft handle has a cylindrical section and a threaded section, one end of the cylindrical section is fixedly connected with the mounting surface, the other end of the cylindrical section is fixedly connected with the threaded section, the return spring and the expansion cone are mounted on the cylindrical section, and the self-locking nut is mounted on the threaded section.

In the foregoing connection structure of the driving shaft and the hub of the electric vehicle, preferably, the expansion cone is a conical cylinder, a through hole is formed in the expansion cone, the expansion cone is mounted on the shaft handle of the driving shaft through the through hole, and the taper of the expansion cone is 18 °.

In the aforementioned connection structure of the electric vehicle driving shaft and the hub, preferably, the mounting hole of the hub is formed by a straight hole and a tapered hole, wherein the straight hole is close to one end of the mounting surface, and the taper of the tapered hole is equal to the taper of the expansion cone.

Compared with the prior art, the invention comprises a driving shaft handle and a hub, wherein the hub is arranged on the driving shaft handle, an expansion cone is sleeved on the driving shaft handle, the inner wall of the expansion cone is in friction connection with the outer wall of the driving shaft handle, the outer wall of the expansion cone is in friction connection with the inner wall of the mounting hole in the hub, a mounting surface is arranged at one end of the driving shaft handle, and a self-locking nut is mounted at the other end of the driving shaft handle. The invention adopts the expansion cone to replace the traditional spline connection, the expansion cone connects the driving shaft handle with the hub by means of friction force, the gap problem during the matching of the traditional spline is solved, the abnormal sound problem during starting is solved, and the torque on the driving shaft handle can be directly transmitted to the hub by using the expansion cone, so that the problem of looseness of the self-locking nut is solved.

Drawings

FIG. 1 is a schematic view of a connection structure between a driving shaft and a hub of an electric vehicle in the prior art;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is an exploded view of the present invention;

fig. 4 is a schematic view of a half-section structure of the present invention.

Description of the reference numerals:

in the prior art: a driving shaft handle 100, a hub 101, a driving shaft self-locking nut 102 and a hub bearing 103;

in the invention: the device comprises a driving shaft handle 1, a hub 2, an expansion cone 3, a mounting surface 4, a self-locking nut 5, a hub bearing 6, a return spring 7 and a through hole 8.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

The embodiment of the invention comprises the following steps: as shown in fig. 2-4, a connecting structure of a driving shaft and a hub of an electric vehicle comprises a driving shaft handle 1 and a hub 2, wherein the hub 2 is arranged on the driving shaft handle 1, an expansion cone 3 is sleeved on the driving shaft handle 1, the inner wall of the expansion cone 3 is in friction connection with the outer wall of the driving shaft handle 1, the outer wall of the expansion cone 3 is in friction connection with the inner wall of the mounting hole in the hub 2, a mounting surface 4 is arranged at one end of the driving shaft handle 1, and a self-locking nut 5 is mounted at the other end of the driving shaft handle 1.

A hub bearing 6 is installed at one end, close to the installation surface 4, of the hub 2, the hub bearing 6 is in interference fit with the hub 2, and one end of the hub bearing 6 is abutted to the installation surface 4. During assembly, the hub bearing 6 is firstly installed on the hub 2, then the hub 2 is installed on the driving shaft handle 1 until the hub bearing 6 is abutted against the installation surface 4, then the expansion cone 3 is installed on the driving shaft handle 1, wherein one end with smaller outer diameter faces the installation surface 4, finally, the self-locking nut 5 is installed on the driving shaft handle 1 through threads, after the self-locking nut is screwed to a preset torque, the inner wall surface of the expansion cone 3 is tightly attached to the driving shaft handle 1, the outer wall surface of the expansion cone 3 is tightly attached to the inner wall surface of the installation hole in the hub 2, and when the driving shaft handle 1 rotates, the expansion cone 3 and the hub 2 synchronously rotate through friction force.

The structure can directly transmit the torque on the driving shaft handle 1 to the hub 2, solves the problem that the self-locking nut 5 is easy to loosen in the prior art, cancels a spline structure and also solves the problem of abnormal sound when the electric vehicle starts.

In a specific embodiment, a return spring 7 is sleeved on the driving shaft handle 1, one end of the return spring 7 is abutted with the mounting surface 4, and the other end of the return spring 7 is abutted with one end of the expansion cone 3. The return spring 7 is arranged to facilitate detachment of the expansion cone 3, and when the self-locking nut 5 is loosened, the expansion cone 3 is pushed outwards by means of elasticity of the return spring 7 to facilitate taking out of the expansion cone 3.

It should be noted that the return spring 7 is an optimal solution, and in order to facilitate the detachment of the expansion cone 3, other structures may also be adopted, for example, a detachment hole is provided on the outer end face of the expansion cone 3, and a tool is used to hook the detachment hole to pull out the expansion cone 3 by force.

Further, the hub 2 is made of 55 steel, the driving shaft shank 1 is made of 55 steel, and the expansion cone 3 is made of 40Cr. The expansion cone 3 made of the material has good contraction performance, so that the expansion cone 3 is tightly held on the driving shaft handle 1 under the extrusion of the mounting hole after being jacked into the mounting hole of the hub 2.

Further, the driving shaft handle 1 is provided with a cylindrical section and a threaded section, one end of the cylindrical section is fixedly connected with the mounting surface 4, the other end of the cylindrical section is fixedly connected with the threaded section, the return spring 7 and the expansion cone 3 are mounted on the cylindrical section, and the self-locking nut 5 is mounted on the threaded section. The expansion cone 3 is a conical cylinder, a through hole 8 is formed in the expansion cone 3, the expansion cone 3 is installed on the driving shaft handle 1 through the through hole 8, and the taper of the expansion cone 3 is 18 degrees.

Further, the mounting hole of the hub 2 is formed by a straight hole close to one end of the mounting surface 4 and a tapered hole having a taper equal to that of the expansion cone 3.

The working principle of the invention is as follows: when screwing up self-locking nut 5, expansion awl 3 extrusion return spring 7, the while expansion awl 3 is extruded under the taper hole effect of 2 mounting holes of wheel hub, the through-hole 8 of expansion awl 3 diminishes, the inner wall of expansion awl 3 closely laminates with the outer wall of drive shaft arbor 1, the outer wall of expansion awl 3 closely laminates with the taper hole in the wheel hub 2 simultaneously, when drive shaft arbor 1 is rotatory, under the frictional force effect, the moment of torsion directly transmits wheel hub 2 through expansion awl 3, make wheel hub 2 follow drive shaft arbor 1 synchronous revolution. When the self-locking nut 5 is loosened, the expansion cone 3 is ejected under the action of the return spring 7, and the hub 2 can be removed.

The present invention has been described in detail with reference to the embodiments shown in the drawings, and it is therefore intended that the present invention not be limited to the exact forms and details shown and described, but that various changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides an electric motor car drive shaft and wheel hub's connection structure, includes drive shaft mandrel (1) and wheel hub (2), wheel hub (2) are installed on drive shaft mandrel (1), its characterized in that: the improved hub driving shaft is characterized in that an expansion cone (3) is sleeved on the driving shaft handle (1), the inner wall of the expansion cone (3) is in friction connection with the outer wall of the driving shaft handle (1), the outer wall of the expansion cone (3) is in friction connection with the inner wall of the mounting hole in the hub (2), a mounting surface (4) is arranged at one end of the driving shaft handle (1), and a self-locking nut (5) is mounted at the other end of the driving shaft handle (1).

2. The connecting structure of the drive shaft and the hub of the electric vehicle as set forth in claim 1, wherein: a hub bearing (6) is installed at one end, close to the installation surface (4), of the hub (2), and one end of the hub bearing (6) is abutted to the installation surface (4).

3. The connecting structure of the drive shaft of the electric vehicle and the hub according to claim 1, wherein: the driving shaft handle (1) is sleeved with a return spring (7), one end of the return spring (7) is abutted to the mounting surface (4), and the other end of the return spring (7) is abutted to one end of the expansion cone (3).

4. The connecting structure of the drive shaft of the electric vehicle and the hub according to claim 1 or 3, characterized in that: the hub (2) is made of 55 steel, the driving shaft handle (1) is made of 55 steel, and the expansion cone (3) is made of 40Cr.

5. The connecting structure of the drive shaft of the electric vehicle and the hub according to claim 4, wherein: the driving shaft handle (1) is provided with a cylindrical section and a threaded section, one end of the cylindrical section is fixedly connected with the mounting surface (4), the other end of the cylindrical section is fixedly connected with the threaded section, the return spring (7) and the expansion cone (3) are installed on the cylindrical section, and the self-locking nut (5) is installed on the threaded section.

6. The connecting structure of a drive shaft and a hub of an electric vehicle according to claim 5, wherein: the expansion cone (3) is a conical cylinder, a through hole (8) is formed in the expansion cone (3), the expansion cone (3) is installed on the driving shaft handle (1) through the through hole (8), and the taper of the expansion cone (3) is 18 degrees.

7. The connecting structure of a drive shaft and a hub of an electric vehicle according to claim 6, wherein: the mounting hole of the hub (2) is composed of a straight hole and a taper hole, wherein the straight hole is close to one end of the mounting surface (4), and the taper of the taper hole is equal to that of the expansion cone (3).