Connecting structure of EPS motor and speed reducing mechanism
By using elastic members in the connection structure between the EPS motor and the speed reduction mechanism to limit the up and down movement of the coupling, the problem of prone to abnormal noise in the connection method in the prior art is solved, and the effect of eliminating abnormal noise and extending service life is achieved.
Patent Information
- Application Number
- CN202422089819.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-08-28
AI Technical Summary
The connection method between the existing EPS motor and the speed reduction mechanism is prone to abnormal noise and friction between the coupling claws, causing the rubber parts of the coupling claws to wear rapidly, affecting driving safety and stability.
A connection structure including a first coupling, a second coupling, an elastic member, a bearing, a worm, a worm gear and an EPS motor is adopted. The axial elastic force of the elastic member limits the up and down movement of the coupling, offsets the left and right axial forces of the worm, thereby eliminating abnormal noise.
It effectively eliminates the axial deviation between the motor shaft and the worm, reduces abnormal noise, extends the service life of the coupling, and improves driving safety and stability.
Smart Images
Figure CN222793605U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a connection structure of an EPS motor and a speed reduction mechanism, belonging to the technical field of automobile steering equipment. Background Art
[0002] The electric power steering system is a power steering system that directly relies on the motor to provide auxiliary power. The superior connection method between the electric power steering system and the worm gear reducer structure directly affects the safety, stability and comfort of driving a car.
[0003] The auxiliary power-assisting mode of the existing automobile electric power steering system is as follows: the motor is linked to the worm gear through a four-claw coupling; because the worm gear is subjected to the left and right axial force of the worm wheel when the worm gear is in meshing operation, the worm gear will move up and down due to the bearing clearance, thereby causing collision between the coupling claws, and then generating abnormal noise, affecting the driving comfort; and the couplings move relative to each other, and mutual friction is generated between their claws, which indirectly causes the rubber parts between the coupling claws to wear and age rapidly, and then leads to fatigue failure, affecting the safety and stability of driving the car.
[0004] Therefore, it is necessary to develop a new connection structure to solve the above problems existing in the connection method between the existing EPS motor and the reduction mechanism. Summary of the invention
[0005] The purpose of the utility model is to provide a connection structure of an EPS motor and a reduction mechanism which has a compact structure and an ingenious design, so as to solve the problem of abnormal noise easily generated in the existing connection mode of the EPS motor and the reduction mechanism.
[0006] The technical solution of the utility model is:
[0007] A connection structure between an EPS motor and a reduction mechanism, comprising a first coupling, a second coupling, an elastic member, a bearing, a worm, a worm wheel and an EPS motor; a worm and a worm wheel are provided on one side of the EPS motor, and the worm wheel is connected to the worm; the characteristic is that a first coupling is provided on the motor shaft of the EPS motor; a second coupling is provided on one end of the worm; a bearing is provided on the worm on one side of the second coupling; an elastic member is clamped between the first coupling and the second coupling; the elastic member is in a circular structure; a plurality of elastic teeth are evenly distributed on the circumference of the elastic member; and extrusion bosses are provided at both ends of the elastic teeth.
[0008] The first coupling is fixedly connected to the motor shaft of the EPS motor by means of spline interference fitting; the second coupling is fixedly connected to the worm by means of spline interference fitting.
[0009] The inner hole of the elastic member is a smooth through hole.
[0010] The first coupling and the second coupling are both provided with four engaging claws; the engaging claws of the first coupling and the second coupling are staggered.
[0011] The distance between the end surface of the engaging claw of the first coupling and the bottom surface of the second coupling is 1 mm; the distance between the end surface of the engaging claw of the second coupling and the bottom surface of the first coupling is 1 mm.
[0012] The two sides of the elastic teeth of the elastic member are respectively connected with the connecting claws of the first coupling and the connecting claws of the second coupling.
[0013] The extrusion bosses at both ends of the elastic teeth of the elastic member are respectively in contact with the bottom surface of the first coupling and the bottom surface of the second coupling.
[0014] The end face of the second coupling is in contact connection with the end face of the inner ring of the bearing.
[0015] The advantages of the utility model are:
[0016] The connection structure of the EPS motor and the speed reduction mechanism is compact and ingeniously designed. The elastic member can limit the up and down movement of the first coupling and the second coupling by the axial elastic force of the extrusion boss, which can effectively offset the left and right axial force of the worm gear on the worm, thereby achieving the purpose of eliminating the axial deviation between the motor shaft and the worm and reducing abnormal noise. It is particularly suitable for the needs of automobile steering systems. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the utility model;
[0018] Figure 2 It is a schematic diagram of the explosion structure of the utility model;
[0019] Figure 3 It is a structural schematic diagram of the elastic member of the utility model;
[0020] Figure 4 for Figure 2 Schematic diagram of the enlarged structure at point A in the middle.
[0021] In the figure: 1. EPS motor; 2. worm; 3. worm wheel; 4. first coupling; 5. second coupling; 6. bearing; 7. elastic member; 8. elastic tooth; 9. extrusion boss; 10. engaging claw; 11. limiting step. DETAILED DESCRIPTION
[0022] The connection structure of the EPS motor 1 and the speed reduction mechanism includes a first coupling 4, a second coupling 5, an elastic member 7, a bearing 6, a worm 2, a worm wheel 3 and the EPS motor 1 (see the attached manual). Figure 1 ).
[0023] A worm 2 and a worm wheel 3 are provided on one side of the EPS motor 1, and the worm wheel 3 is connected to the worm 2 (see the attached manual). Figure 1 ).
[0024] The motor shaft of the EPS motor 1 is provided with a first coupling 4; one end of the worm 2 is provided with a second coupling 5. The first coupling 4 and the second coupling 5 are both provided with four engaging claws 10; the engaging claws 10 of the first coupling 4 and the second coupling 5 are staggered (see the attached manual). Figure 4 ).
[0025] The first coupling 4 is fixedly connected to the motor shaft of the EPS motor 1 by means of spline interference fitting; the second coupling 5 is fixedly connected to the worm 2 by means of spline interference fitting.
[0026] A bearing 6 is mounted on the worm 2 on one side of the second coupling 5; an elastic member 7 is clamped between the first coupling 4 and the second coupling 5 (see the attached manual Figure 4 ).
[0027] The elastic member 7 is a circular structure; the inner hole of the elastic member 7 is a smooth through hole. A plurality of elastic teeth 8 are evenly distributed on the circumference of the elastic member 7; extrusion bosses 9 are provided at both ends of the elastic teeth 8 (see the attached Figure 3 ).
[0028] The two sides of the elastic teeth 8 of the elastic member 7 are respectively connected with the engaging claws 10 of the first coupling 4 and the engaging claws 10 of the second coupling 5. The extrusion bosses 9 at both ends of the elastic teeth 8 of the elastic member 7 are respectively in contact with the bottom surface of the first coupling 4 and the bottom surface of the second coupling 5 (see the attached manual). Figure 1 ).
[0029] The distance between the end surface of the engaging claw 10 of the first coupling 4 and the bottom surface of the second coupling 5 is 1 mm; the distance between the end surface of the engaging claw 10 of the second coupling 5 and the bottom surface of the first coupling 4 is 1 mm.
[0030] The end face of the second coupling 5 is in contact with the end face of the inner ring of the bearing 6. The outer diameter of the contact point between the second coupling 5 and the inner ring of the bearing 6 must be smaller than the inner diameter of the outer ring of the bearing. After press-fitting, the bottom face of the second coupling 5 is flush with the end face of the worm 2.
[0031] The worm 2 is provided with a limited step 11 (see the attached manual). Figure 4 ). The limiting step 11 can limit the bearing 6. The inner hole of the bearing 6 is connected to the bearing position on the worm 2.
[0032] The connection structure of the EPS motor and the speed reduction mechanism, when working, the elastic member 7 generates plastic deformation between the first coupling 4 and the second coupling 5, thereby generating an outward plastic elastic force, the second coupling 5 is hard-connected with the inner ring of the bearing 6 and the worm 2, and the end face of the second coupling 5 is in contact with the end face of one end of the inner ring of the bearing and the end face of the other end of the inner ring of the bearing is in contact with the end face of the limiting step 11, that is, the force exerted on the second coupling 5 is the left and right axial force generated by the operation of the worm wheel 3 on the worm 2, which causes the second coupling 5 to move up and down, and the plastic elastic force of the elastic member 7 effectively offsets this force, eliminating the abnormal noise caused by the up and down movement and collision of the worm 2;
[0033] The engaging claw 10 of the first coupling 4 and the engaging claw 10 of the second coupling 5 are respectively interference fit with the elastic teeth 8 of the elastic member 7, thereby limiting the radial movement of the first coupling 4 and the second coupling 5 and eliminating abnormal noise caused by the relative movement and collision between the first coupling 4 and the second coupling 5.
[0034] The connection structure of the EPS motor and the speed reduction mechanism is compact and ingeniously designed. The elastic member 7 can limit the up and down movement of the first coupling 4 and the second coupling 5 by the axial elastic force of the extrusion boss 9, which can effectively offset the left and right axial force of the worm gear 2 caused by the operation of the worm wheel, thereby achieving the purpose of eliminating the axial deviation between the motor shaft and the worm 2 and reducing abnormal noise. It is particularly suitable for the needs of automobile steering systems.
Claims
1. A connection structure between an EPS motor and a speed reduction mechanism, comprising a first coupling (4), a second coupling (5), an elastic member (7), a bearing (6), a worm (2), a worm wheel (3), and an EPS motor (1); the EPS motor (1) is provided with a worm (2) and a worm wheel (3) on one side, and the worm wheel (3) is connected to the worm (2); the characteristics are: The motor shaft of the EPS motor (1) is provided with a first coupling (4); one end of the worm (2) is provided with a second coupling (5); a bearing (6) is provided on the worm (2) on one side of the second coupling (5); an elastic member (7) is clamped between the first coupling (4) and the second coupling (5); the elastic member (7) is in a circular structure; a plurality of elastic teeth (8) are evenly distributed on the circumference of the elastic member (7); and extrusion bosses (9) are provided at both ends of the elastic teeth (8).
2. The connection structure of the EPS motor and the speed reduction mechanism according to claim 1, characterized in that: The first coupling (4) is fixedly connected to the motor shaft of the EPS motor (1) by means of a spline interference fit; and the second coupling (5) is fixedly connected to the worm (2) by means of a spline interference fit.
3. The connection structure of the EPS motor and the speed reduction mechanism according to claim 1, characterized in that: The inner hole of the elastic member (7) is a smooth through hole.
4. The connection structure of the EPS motor and the speed reduction mechanism according to claim 1, characterized in that: The first coupling (4) and the second coupling (5) are both provided with four engaging claws (10); the engaging claws (10) of the first coupling (4) and the second coupling (5) are arranged in a staggered manner.
5. The connection structure of the EPS motor and the speed reduction mechanism according to claim 4, characterized in that: The distance between the end surface of the engaging claw (10) of the first coupling (4) and the bottom surface of the second coupling (5) is 1 mm; the distance between the end surface of the engaging claw (10) of the second coupling (5) and the bottom surface of the first coupling (4) is 1 mm.
6. The connection structure of the EPS motor and the speed reduction mechanism according to claim 4, characterized in that: Both sides of the elastic teeth (8) of the elastic member (7) are respectively connected to the engaging claws (10) of the first coupling (4) and the engaging claws (10) of the second coupling (5).
7. The connection structure of the EPS motor and the speed reduction mechanism according to claim 4, characterized in that: The extrusion bosses (9) at both ends of the elastic teeth (8) of the elastic member (7) are respectively in contact with the bottom surface of the first coupling (4) and the bottom surface of the second coupling (5).
8. The connection structure of the EPS motor and the speed reduction mechanism according to claim 1, characterized in that: The end surface of the second coupling (5) is in contact connection with the end surface of the inner ring of the bearing (6).