Shaft connecting structure of automobile electric limiter

Abstract

The shaft connecting structure of the automobile electric limiting stopper comprises a driving motor, a worm and gear mechanism and a rubber bushing, an external spline is arranged on a motor shaft of the driving motor, a spline hole is formed in a worm of the worm and gear mechanism, the rubber bushing is provided with an axial blind hole, an internal spline is arranged on the inner wall of the axial blind hole, and the internal spline is arranged on the outer wall of the internal spline. The internal spline is matched with an external spline of a motor shaft, and an external spline is arranged outside the rubber bushing and matched with a spline hole of a worm.

Description

Technical Field

[0001] The utility model relates to the field of automobile electric limiters, in particular to a shaft connection structure of an automobile electric limiter. Background Art

[0002] The main function of the automobile electric limiter is to automatically open and close the door, and to make the door hover on a slope. The automobile electric limiter includes a driving motor, a worm gear mechanism, and a damper. The motor shaft of the motor is spline-connected with the worm of the worm gear mechanism, and the other end of the worm is connected to the damper. The worm of the worm gear mechanism is connected to a screw, and the door is controlled by the screw. However, in the existing automobile electric limiter, the spline connection between the motor shaft of the motor and the worm of the worm gear mechanism will collide during power transmission, generating a large noise, and the spline connection is also prone to eccentricity. In addition, a large friction loss will be generated during the power transmission between the motor shaft and the worm. Especially in the transmission of small torque such as the automobile electric limiter, the friction loss greatly affects the power output. Summary of the invention

[0003] In view of the above problems, the utility model provides a shaft connection structure of an automobile electric limiter, through which noise and wear can be reduced.

[0004] The technical solution of the utility model is: the shaft connection structure of the automobile electric limiter includes a driving motor and a worm gear mechanism, the motor shaft of the driving motor is provided with an external spline, the worm of the worm gear mechanism is provided with a spline hole, and also includes a rubber bushing, the rubber bushing is provided with an axial blind hole, the inner wall of the axial blind hole is an internal spline, the internal spline matches the external spline of the motor shaft, the outer part of the rubber bushing is an external spline, the external spline matches the spline hole of the worm.

[0005] Preferably, the radial height of the external spline of the motor shaft is 3-8 mm, and the radial height of the spline hole of the worm is 3.3-8.8 mm.

[0006] Preferably, the thickness of the hole wall and the hole bottom of the axial blind hole of the rubber bushing are both 0.3-0.8 mm.

[0007] Preferably, the depth of the axial blind hole of the rubber bushing is less than or equal to the length of the external spline of the motor shaft.

[0008] Preferably, the depth of the axial blind hole of the rubber bushing is less than or equal to the depth of the spline hole of the worm.

[0009] Preferably, the length of the rubber bushing is 3-10 mm.

[0010] The advantages of the utility model are as follows: the utility model provides a rubber bushing at the spline connection between the motor shaft and the worm of the automobile electric limiter, so that when the motor shaft transmits power to the worm, the impact on the spline connection can be reduced, and the noise during operation can be reduced; at the same time, the rubber bushing also has a self-aligning effect, and can also reduce the friction loss between the motor shaft and the worm in power transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic structural diagram of a motor shaft, a rubber bushing and a worm gear of the utility model. DETAILED DESCRIPTION

[0012] See also Figure 1 The shaft connection structure of the automobile electric limiter includes a driving motor and a worm gear mechanism. The motor shaft 1 of the driving motor is provided with an external spline 11, and the worm 3 of the worm gear mechanism is provided with a spline hole 31. It also includes a rubber bushing 2, and the rubber bushing 2 is provided with an axial blind hole. The thickness of the hole wall and the hole bottom of the axial blind hole 21 of the rubber bushing 2 are both 0.3-0.8 mm, ensuring that the thickness of the rubber bushing 2 is appropriate. If the thickness of the rubber bushing 2 is too small, the rubber bushing 2 cannot play the role of shock absorption, noise reduction, and wear reduction. If the thickness of the rubber bushing 2 is too large, it will affect the assembly and even affect the power transmission between the motor shaft 1 and the worm 3. The inner wall of the axial blind hole 21 is an internal spline, which matches the external spline 11 of the motor shaft 1. The depth of the axial blind hole 21 of the rubber bushing 2 is less than or equal to the motor The length of the external spline 11 of the shaft 1 ensures the assembly of the rubber bushing 2. The outside of the rubber bushing 2 is an external spline, which matches the spline hole 31 of the worm 3. The depth of the axial blind hole 21 of the rubber bushing 2 is less than or equal to the depth of the spline hole 31 of the worm 3, ensuring the assembly of the rubber bushing 2. The length of the rubber bushing 2 is 3 to 10 mm, ensuring that the length of the rubber bushing 2 is appropriate. If the length of the rubber bushing 2 is too short, the rubber bushing 2 cannot play the role of shock absorption, noise reduction, and wear reduction. If the length of the rubber bushing 2 is too long, it will affect the assembly. The radial height of the external spline 11 of the motor shaft 1 is 3 to 8 mm, and the radial height of the spline hole 31 of the worm 3 is 3.3 to 8.8 mm, ensuring that the power of the motor can be transmitted to the worm 3 of the worm gear mechanism through the external spline 11 of the motor shaft.

[0013] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A shaft connection structure of an electric limiter for an automobile, comprising a drive motor and a worm gear mechanism, wherein an external spline (11) is arranged on a motor shaft (1) of the drive motor, and a spline hole (31) is arranged on a worm (3) of the worm gear mechanism, wherein: The invention also comprises a rubber bushing (2), wherein the rubber bushing (2) is provided with an axial blind hole (21), the inner wall of the axial blind hole (21) is an internal spline, and the internal spline matches the external spline (11) of the motor shaft (1), and the outside of the rubber bushing (2) is an external spline, and the external spline matches the spline hole (31) of the worm (3).

2. The shaft connection structure of the automobile electric limiter according to claim 1 is characterized in that: The radial height of the external spline (11) of the motor shaft (1) is 3 to 8 mm, and the radial height of the spline hole (31) of the worm (3) is 3.3 to 8.8 mm.

3. The shaft connection structure of the automobile electric limiter according to claim 1 is characterized in that: The thickness of the hole wall and the hole bottom of the axial blind hole (21) of the rubber bushing (2) are both 0.3 to 0.8 mm.

4. The shaft connection structure of the automobile electric limiter according to claim 1, characterized in that: The depth of the axial blind hole (21) of the rubber bushing (2) is less than or equal to the length of the external spline (11) of the motor shaft (1).

5. The shaft connection structure of the automobile electric limiter according to claim 1, characterized in that: The depth of the axial blind hole (21) of the rubber bushing (2) is less than or equal to the depth of the spline hole (31) of the worm (3).

6. The shaft connection structure of the automobile electric limiter according to claim 1, characterized in that: The length of the rubber bushing (2) is 3 to 10 mm.

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