CN216895435U

CN216895435U - Novel transmission shaft

Info

Publication number: CN216895435U
Application number: CN202220221425.5U
Authority: CN
Inventors: 邱政华; 李江兵; 雷新
Original assignee: Jiangxi Isuzu Motors Co Ltd
Current assignee: Jiangxi Isuzu Motors Co Ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-07-05
Anticipated expiration: 2032-01-26

Abstract

The utility model discloses a novel transmission shaft, which relates to the technical field of automobile transmission and comprises a spline shaft fork, a bearing and a connecting fork: the boss surface of the spline shaft fork is provided with annularly distributed spline shaft fork end surface teeth; two end faces of the bearing inner ring are provided with bearing end face teeth which are annularly arranged; the end surface of the connecting fork is provided with connecting fork end surface teeth which are annularly arranged; the spline shaft fork end face teeth are meshed and locked with one of the bearing end face teeth, and the connecting fork end face teeth are meshed and locked with the other connecting fork end face teeth. According to the utility model, the spline shaft fork and the bearing, and the bearing and the connecting fork are engaged and locked through the end face teeth, so that the form of plane friction is cancelled, the torque transmission capability between parts is improved, the bearing and the connecting fork cannot move relative to each other in the circumferential direction between the spline shaft fork and the bearing, the stick-slip friction is fundamentally avoided, the torque bearing capability of the transmission shaft is enhanced, and the stick-slip friction noise of the transmission shaft is thoroughly eliminated.

Description

Novel transmission shaft

Technical Field

The utility model relates to the technical field of automobile transmission, in particular to a novel transmission shaft.

Background

Along with the increasing requirement on the comfort level of the automobile, the NVH performance under some special working conditions is more and more attractive to customers, and the improvement of the NVH level under the special working conditions is more and more important.

Under special working conditions such as automobile rapid start, rapid acceleration and rapid deceleration, the transmission shaft is easily subjected to stick-slip friction and generates noise under the influence of the structure of the transmission shaft, so that the driving feeling of customers is influenced. The frequency of occurrence of such stick-slip noise tends to increase significantly as the power torque of the engine increases continuously. Therefore, optimizing the structural design of the transmission shaft is particularly key to solving the stick-slip noise and improving the NVH performance of the whole vehicle.

As shown in fig. 1, the conventional dual-section transmission shaft is generally assembled on a frame through an intermediate support, a bearing in the intermediate support is in contact with a yoke, the bearing is fixed through a shaft force provided by a lock nut, a certain gap exists between a spline shaft yoke and a matching spline of the yoke, and a certain deformation exists after a part is stressed, so that a certain relative motion can be generated between the yoke and the bearing. For a transmission shaft with a traditional structure, a connecting fork and a bearing are in plane contact, and under the instant large torque impact, the relative motion generated between the connecting fork and the bearing is easy to generate stick-slip friction and generate noise.

The prior art achieves the purpose of reducing the noise by adding an antifriction gasket between the connecting fork and the bearing or reducing the fit clearance between the spline shaft fork and the connecting fork, but the measures only reduce the friction coefficient of a contact surface and the relative movement amount, only attenuate the noise and reduce the frequency of the noise, and cannot completely eliminate the noise. In addition, excessively reducing the fit clearance of the spline shaft yoke and the clevis increases the difficulty of assembly and after-market repair.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a novel transmission shaft, which comprises a spline shaft fork, a bearing and a connecting fork:

the boss surface of the spline shaft fork is provided with spline shaft fork end surface teeth which are annularly distributed;

two end faces of the bearing inner ring are provided with bearing end face teeth which are annularly arranged;

the end face of the connecting fork is provided with connecting fork end face teeth which are annularly arranged;

the end face teeth of the spline shaft fork are meshed and locked with one of the bearing end face teeth, and the end face teeth of the connecting fork are meshed and locked with the end face teeth of the other connecting fork.

In a further aspect, the method comprises the following steps,

the outer surface of the end part of the spline shaft fork is provided with an external thread, and the end part sequentially penetrates through the through hole in the middle of the bearing and the through hole of the connecting fork and then is in threaded connection with the nut.

The spline shaft has the further scheme that tooth surface knots of the spline shaft fork end face teeth, the bearing end face teeth and the connecting fork end face teeth are the same and are of a wedge-shaped structure or a conical structure.

The spline shaft has the further scheme that the arrangement modes of the end face teeth of the spline shaft fork, the end face teeth of the bearing and the end face teeth of the connecting fork are the same and are arranged in a close arrangement mode or an interval arrangement mode.

The spline shaft end face teeth, the bearing end face teeth and the outer surfaces of the connecting fork end face teeth are provided with wear-resistant layers, each wear-resistant layer comprises a tungsten carbide layer, a nickel layer and a boron nitride layer, the tungsten carbide layers are attached to the outer end faces of the three end face teeth, and the nickel layers are located between the tungsten carbide layers and the boron nitride layers.

The further scheme is that connecting holes are formed in two arms of the connecting fork, and wear-resistant nylon layers are arranged on the surfaces of the inner walls of the connecting holes.

The utility model has the beneficial effects that:

according to the utility model, the spline shaft fork and the bearing, and the bearing and the connecting fork are engaged and locked through the end face teeth, so that the form of plane friction is cancelled, the torque transmission capability between parts is improved, the bearing and the connecting fork cannot move relative to each other in the circumferential direction between the spline shaft fork and the bearing, the stick-slip friction is fundamentally avoided, the torque bearing capability of the transmission shaft is enhanced, and the stick-slip friction noise of the transmission shaft is thoroughly eliminated.

Drawings

FIG. 1 is a schematic structural view of a transmission shaft in the prior art;

fig. 2 is an exploded view of a novel transmission shaft according to an embodiment of the present invention;

FIG. 3 is a view from another angle of FIG. 2;

fig. 4 is a schematic view of a novel transmission shaft according to an embodiment of the present invention after structural connection of parts;

FIG. 5 is a schematic structural diagram of a wear-resistant layer provided in an embodiment of the present invention;

the attached drawings are marked as follows: 1-a spline shaft yoke; 10-spline shaft yoke end face teeth; 2-a bearing; 20-bearing end face teeth; 3-a clevis; 30-connecting fork end face teeth; 31-a connection hole; 4-a nut; 50-a tungsten carbide layer; 51-nickel layer 52-boron nitride layer.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 2 to 5, one embodiment of the present invention discloses a novel transmission shaft, which comprises a spline shaft yoke 1, a bearing 2 and a connecting yoke 3:

spline shaft fork end face teeth 10 which are annularly distributed are arranged on the boss face of the spline shaft fork 1;

two end faces of the inner ring of the bearing 2 are provided with bearing end face teeth 20 which are annularly arranged;

the end surface of the connecting fork 3 is provided with connecting fork end surface teeth 30 which are annularly arranged;

spline shaft fork end face teeth 10 are meshed and locked with one bearing end face tooth 20, and connecting fork end face teeth 30 are meshed and locked with the other connecting fork end face teeth 30.

This embodiment is through between messenger's spline shaft fork and the bearing, bearing and connection fork all through the cooperation of end face tooth meshing locking, has not only cancelled the form of plane friction, has still promoted the biography between the part and has turned round the ability for between spline shaft fork and the bearing, can not produce the relative motion of circumferencial direction between bearing and the connection fork, and then fundamentally has stopped the production of stick-slip friction, strengthens the bearing of transmission shaft and turns round the ability, thoroughly eliminates transmission shaft stick-slip friction noise.

The outer surface of the end part of the spline shaft fork 1 is provided with an external thread, and the end part sequentially penetrates through a through hole in the middle of the bearing 2 and a through hole of the connecting fork 3 and then is in threaded connection with the nut 4.

This embodiment is through the tip and the nut threaded connection that make spline shaft fork, realizes the fixed connection dismantled between spline shaft fork, bearing and the joint yoke three.

In the present embodiment, the tooth surface junctions of the spline shaft fork end face teeth 10, the bearing end face teeth 20, and the connecting fork end face teeth 30 are the same and are provided in a wedge structure or a tapered structure. The wedge-shaped structure is adopted in the embodiment, and the wedge-shaped surfaces arranged on the face teeth are beneficial to realizing the forced transmission of circumferential force and can transmit large torque.

In the present embodiment, the spline shaft fork end face teeth 10, the bearing end face teeth 20, and the connecting fork end face teeth 30 are arranged in the same manner, and are arranged in a close arrangement or at intervals. The embodiment adopts a structure that the cross sections of the spline shaft fork end part, the bearing end part and the connecting fork end part are circular in a matched mode and are arranged closely.

In the present embodiment, the outer surfaces of spline shaft fork end face teeth 10, bearing end face teeth 20, and connecting fork end face teeth 30 are all provided with wear-resistant layers, each wear-resistant layer includes a tungsten carbide layer 50, a nickel layer 51, and a boron nitride layer 52, tungsten carbide layer 50 is attached to the outer end faces of the above three end face teeth, and nickel layer 51 is located between tungsten carbide layer 50 and boron nitride layer 52. This embodiment is through setting up the wearing layer at the terminal surface tooth surface, promotes the terminal surface tooth and has stronger anti friction loss ability, effectively reduces wearing and tearing, prolongs the life of terminal surface tooth. The hardness of the tungsten carbide in the embodiment can reach HRC70(HRA86.5), the nickel layer has good ductility, has medium hardness, the hardness of the boron nitride is second to that of diamond, and the three materials have good hardness and are suitable for being used as wear-resistant material layers.

In this embodiment, the two arms of the yoke 3 are provided with connecting holes 31, and the inner wall surfaces of the connecting holes 31 are provided with wear-resistant nylon layers. The present embodiment enhances the wear resistance of the mounting hole by the above arrangement.

Finally, only specific embodiments of the present invention have been described in detail above. The utility model is not limited to the specific embodiments described above. Equivalent modifications and substitutions by those skilled in the art are also within the scope of the present invention. Accordingly, equivalent alterations and modifications are intended to be included within the scope of the utility model, without departing from the spirit and scope of the utility model.

Claims

1. A novel transmission shaft is characterized in that:

including spline shaft fork (1), bearing (2) and yoke (3):

the boss surface of the spline shaft fork (1) is provided with spline shaft fork end surface teeth (10) which are annularly distributed;

two end faces of the inner ring of the bearing (2) are provided with bearing end face teeth (20) which are annularly arranged;

the end face of the connecting fork (3) is provided with connecting fork end face teeth (30) which are annularly arranged;

the spline shaft fork end face teeth (10) are meshed and locked with one of the bearing end face teeth (20), and the connecting fork end face teeth (30) are meshed and locked with the other connecting fork end face teeth (30).

2. A new propeller shaft as defined in claim 1, wherein:

the outer surface of the end part of the spline shaft fork (1) is provided with an external thread, and the end part sequentially penetrates through the through hole in the middle of the bearing (2) and the through hole of the connecting fork (3) and then is in threaded connection with the nut (4).

3. A new propeller shaft as defined in claim 1, wherein:

the spline shaft fork end face teeth (10), the bearing end face teeth (20) and the connecting fork end face teeth (30) are identical in tooth surface knots and are of a wedge-shaped structure or a conical structure.

4. The novel propeller shaft of claim 3 wherein:

the arrangement modes of the spline shaft fork end face teeth (10), the bearing end face teeth (20) and the connecting fork end face teeth (30) are the same and are arranged closely or at intervals.

5. A new propeller shaft as defined in claim 1, wherein:

the outer surface of spline shaft fork terminal surface tooth (10), bearing terminal surface tooth (20), connection fork terminal surface tooth (30) all is provided with the wearing layer, the wearing layer includes tungsten carbide layer (50), nickel layer (51) and boron nitride layer (52), tungsten carbide layer (50) are attached at the outer terminal surface of above-mentioned three kinds of terminal surface teeth, nickel layer (51) are located between tungsten carbide layer (50) and the boron nitride layer (52).

6. The novel propeller shaft of claim 1 wherein:

connecting holes (31) are formed in two arms of the connecting fork (3), and wear-resistant nylon layers are arranged on the surfaces of the inner walls of the connecting holes (31).