Connecting structure of EPS motor and speed reducing mechanism

Abstract

The utility model relates to the technical field of automobile parts, in particular to a connecting structure of an EPS motor and a speed reducing mechanism, which comprises the EPS motor and the speed reducing mechanism, a rotor shaft of the EPS motor is provided with a protruding conical end portion, a plurality of bosses are evenly distributed on the outer surface of the conical end portion, the head width of each boss is larger than the tail width of each boss, and the diameter of each boss is larger than that of each boss. A worm of the speed reducing mechanism is provided with a concave conical shaft hole, a plurality of grooves are evenly distributed in the inner surface of the conical shaft hole, the head width of each groove is larger than the tail width of each groove, the conical end is inserted into the conical shaft hole, and the boss is embedded into the corresponding groove. Compared with the prior art, driving transmission between the EPS motor and the speed reducing mechanism is more stable, collision noise caused by dimensional tolerance is avoided, driving comfort is improved, and high-efficiency work of the EPS motor is guaranteed; meanwhile, the matching structure of the boss and the groove compensates the radial deviation and the axial deviation between the rotor shaft and the worm, so that the connection between the EPS motor and the speed reducing mechanism is more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a connection structure of an EPS motor and a speed reduction mechanism. Background Art

[0002] The traditional EPS motor and the reduction mechanism are assembled by setting a rubber pad and two couplings to achieve the connection between the EPS motor and the reduction mechanism.

[0003] Three parts are added between the rotor shaft of the EPS motor and the reduction mechanism, which also increases the dimensional tolerance and processing cost of the corresponding connection structure. After the EPS motor drives the reduction mechanism to operate, the gap caused by the dimensional tolerance makes the drive transmission between the EPS motor and the reduction mechanism unstable, which may cause collision and noise during operation.

[0004] Therefore, it is necessary to design a connection structure between the EPS motor and the reduction mechanism to reduce parts and avoid the problems of unstable drive transmission and collision noise caused by dimensional tolerances. Summary of the invention

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a connection structure between an EPS motor and a speed reduction mechanism to reduce parts and avoid the problems of unstable drive transmission and collision noise caused by dimensional tolerances.

[0006] In order to achieve the above-mentioned purpose, the utility model is a connection structure between an EPS motor and a reduction mechanism, including an EPS motor and a reduction mechanism. The rotor shaft of the EPS motor is provided with a protruding conical end portion, and the outer surface of the conical end portion is evenly distributed with a plurality of bosses, and the head width of the bosses is greater than the tail width. The worm of the reduction mechanism is provided with a recessed conical shaft hole, and the inner surface of the conical shaft hole is evenly distributed with a plurality of grooves, and the head width of the grooves is greater than the tail width. The conical end portion is inserted into the conical shaft hole, and the bosses are embedded in the corresponding grooves.

[0007] The boss is arranged along the axial direction of the rotor shaft.

[0008] The head of the boss is one end located at the end of the rotor shaft, and the tail of the boss is the other end away from the end of the rotor shaft.

[0009] The groove is arranged along the axial direction of the worm.

[0010] The head of the groove is one end located at the end of the worm, and the tail of the groove is the other end away from the end of the worm.

[0011] The number of the bosses and the grooves are the same and their positions correspond.

[0012] Compared with the prior art, the utility model changes the connection structure between the EPS motor rotor shaft and the worm gear of the reduction mechanism, so that the drive transmission between the EPS motor and the reduction mechanism is more stable, the collision noise caused by dimensional tolerance is avoided, the driving comfort is improved, and the high-efficiency operation of the EPS motor is ensured; at the same time, the matching structure of the boss and the groove compensates for the radial deviation and axial deviation between the rotor shaft and the worm gear, so that the connection between the EPS motor and the reduction mechanism is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the utility model.

[0014] Figure 2 It is an axonometric drawing of the worm of the utility model.

[0015] Figure 3 It is a cross-sectional view of the worm of the utility model.

[0016] Figure 4 It is an end view of the worm of the utility model.

[0017] Figure 5 It is an axonometric view of the rotor shaft of the utility model.

[0018] Figure 6 It is an axonometric view of the conical end of the rotor shaft of the utility model. DETAILED DESCRIPTION

[0019] The utility model is now further described with reference to the accompanying drawings.

[0020] See also Figure 1 to Figure 6 The utility model is a connection structure between an EPS motor and a reduction mechanism, comprising an EPS motor and a reduction mechanism. The rotor shaft 1 of the EPS motor is provided with a protruding conical end portion 11, and the outer surface of the conical end portion 11 is evenly distributed with a plurality of bosses 12, and the head width of the bosses 12 is greater than the tail width. The worm 2 of the reduction mechanism is provided with a concave conical shaft hole 21, and the inner surface of the conical shaft hole 21 is evenly distributed with a plurality of grooves 22, and the head width of the grooves 22 is greater than the tail width. The conical end portion 11 is inserted into the conical shaft hole 21, and the bosses 12 are embedded in the corresponding grooves 22.

[0021] See also Figure 6 The boss 12 is arranged along the axial direction of the rotor shaft 1. The head of the boss 12 is one end located at the end of the rotor shaft 1, and the tail of the boss 12 is the other end away from the end of the rotor shaft 1.

[0022] See also Figure 3 , Figure 4 , the groove 22 is arranged along the axial direction of the worm 2. The head of the groove 22 is one end located at the end of the worm 2, and the tail of the groove 22 is the other end away from the end of the worm 2.

[0023] The number of bosses 12 and the positions of grooves 22 are the same and correspond to each other. The cooperation between the bosses 12 and the grooves 22 can compensate for the radial deviation and axial deviation between the rotor shaft 11 and the worm 21 .

[0024] During assembly of the utility model, the rotor shaft 1 can be frozen and then quickly inserted into the conical shaft hole 21 of the worm 2. Since the size of the rotor shaft 1 will be reduced to a certain extent after being frozen, after the assembly is restored to room temperature, the rotor shaft 1 will expand and fit closely with the worm 2, thereby ensuring the direct connection between the EPS motor and the reduction mechanism, reducing the use of couplings and rubber pads, and also reducing processing costs.

[0025] It has been verified that the longer inclined contact surface between the conical end 11 of the rotor shaft 1 and the conical shaft hole 21 of the worm 2 has a larger static friction force, and the strong assembly of the boss 12 and the groove 22 can meet the torque requirement of the EPS motor.

[0026] The utility model changes the connection structure between the EPS motor rotor shaft and the worm gear of the reduction mechanism, making the drive transmission between the EPS motor and the reduction mechanism more stable, avoiding the collision noise caused by dimensional tolerance, improving driving comfort, and ensuring the high-efficiency operation of the EPS motor; at the same time, the matching structure of the boss and the groove compensates for the radial deviation and axial deviation between the rotor shaft and the worm gear, making the connection between the EPS motor and the reduction mechanism more reliable.

Claims

1. A connection structure between an EPS motor and a reduction mechanism, comprising an EPS motor and a reduction mechanism, characterized in that: The rotor shaft (1) of the EPS motor is provided with a protruding conical end portion (11), the outer surface of the conical end portion (11) is evenly distributed with a plurality of bosses (12), the head width of the bosses (12) is greater than the tail width, the worm (2) of the speed reduction mechanism is provided with a concave conical shaft hole (21), the inner surface of the conical shaft hole (21) is evenly distributed with a plurality of grooves (22), the head width of the grooves (22) is greater than the tail width, the conical end portion (11) is inserted into the conical shaft hole (21), and the bosses (12) are embedded in the corresponding grooves (22).

2. The connection structure of the EPS motor and the speed reduction mechanism according to claim 1, characterized in that: The boss (12) is arranged along the axial direction of the rotor shaft (1).

3. The connection structure of the EPS motor and the speed reduction mechanism according to claim 1, characterized in that: The head of the boss (12) is one end located at the end of the rotor shaft (1), and the tail of the boss (12) is the other end away from the end of the rotor shaft (1).

4. The connection structure of the EPS motor and the speed reduction mechanism according to claim 1, characterized in that: The groove (22) is arranged along the axial direction of the worm (2).

5. The connection structure of the EPS motor and the speed reduction mechanism according to claim 1, characterized in that: The head of the groove (22) is one end located at the end of the worm (2), and the tail of the groove (22) is the other end away from the end of the worm (2).

6. The connection structure of the EPS motor and the speed reduction mechanism according to claim 1, characterized in that: The number of the bosses (12) and the grooves (22) are the same and their positions correspond.

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