Worm and gear transmission mechanism, driver comprising worm and gear transmission mechanism and car window lifting system comprising worm and gear transmission mechanism

Abstract

The invention provides a worm gear and worm transmission mechanism which comprises a main shaft, a worm gear and a worm gear, and the worm gear and worm transmission mechanism is arranged at the position, close to the output end, of the main shaft; the gear box comprises a shell, the main shaft is located in the shell, and a worm gear matched with the worm is arranged in the gear box; a compression spring and a retaining gasket are sequentially arranged between the inner wall of one end of the shell and the output end of the main shaft in the axial direction of the main shaft, and the output end of the main shaft abuts against the retaining gasket and then exerts prestress on the compression spring. Wherein a shape feature for positioning the compression spring during the assembly process is formed on each of the inner wall of the housing and the retaining pad. The invention further provides a driver with the transmission mechanism and a car window lifting system. By the adoption of the technical scheme, the transmission mechanism can be more easily assembled in a production line, the risk that the retaining liner falls off is reduced, the product yield is increased, and the manufacturing cost is reduced.

Claims

1. A worm gear transmission mechanism, comprising: A main shaft (10), wherein the main shaft (10) is provided with a worm (101) at a position close to the output end thereof; A gear box (20), the gear box (20) comprising a housing (201), the main shaft (10) being located inside the housing (201), and a worm wheel (202) matching with the worm (101) being arranged inside the gear box (20); Features: A compression spring (50) and a retaining pad (40) are sequentially arranged between the inner wall of one end of the housing (201) and the output end of the main shaft (10) along the axial direction of the main shaft (10), and the output end of the main shaft (10) abuts against the retaining pad (40) and thereby applies prestress to the compression spring (50), wherein shape feature structures for positioning the compression spring (50) during the assembly process are respectively formed on the inner wall of the housing (201) and the retaining pad (40).

2. The worm gear transmission mechanism according to claim 1, characterized in that: The shape feature structure formed on the inner wall of the shell (201) or the retaining pad (40) includes any of the following: a protrusion (230) protruding along the axial direction toward the compression spring (50), a recessed portion (410) recessed along the axial direction, or a combination of the two.

3. The worm gear transmission mechanism according to claim 2, characterized in that: The protrusion (230) is rotationally symmetrical with respect to the rotation axis of the main shaft (10), and extends into an internal surrounding space (S) defined by the inner diameter of the compression spring (50) in an interference fit manner.

4. The worm gear transmission mechanism according to claim 2, characterized in that: The recessed portion (410) is formed to have a cross-sectional shape that matches the cross-sectional shape defined by the outer diameter of the compression spring (50), and the depth and radius of the recessed portion (410) are set so that the end of the compression spring (50) is received in the recessed portion (410) in an interference fit manner and will not fall out therefrom during the assembly process.

5. The worm gear transmission mechanism according to claim 2, characterized in that: The recessed portion (410) is formed in the form of a groove, wherein the support ring portion of the corresponding end of the compression spring (50) can be embedded in the groove so as not to fall out therefrom during the assembly process.

6. The worm gear transmission mechanism according to any one of claims 1 to 5, characterized in that: The interior of the shell (201) is defined as a compression spring receiving chamber (2011), a retaining pad receiving chamber (2012) and a bearing receiving chamber (2013) which are connected in sequence along the axial direction, and the inner circumferential surface of each chamber is a smooth circumferential surface, wherein the diameter of the retaining pad receiving chamber (2012) is larger than the diameter of the compression spring receiving chamber (2011), thereby forming a transition shoulder portion (121) at the connecting portion between the two.

7. The worm gear transmission mechanism according to claim 6, characterized in that: An inwardly recessed spindle receiving portion (420) is machined on the end surface of the retaining pad (40) facing away from the compression spring (50) for receiving the output end of the spindle (10), and the cross-sectional shape of the spindle receiving portion (420) matches the cross-sectional shape of the output end of the spindle (10).

8. The worm gear transmission mechanism according to claim 7, characterized in that: During the assembly process, the retaining pad (40) slides further along the axial direction toward the compression spring (50) in the retaining pad receiving cavity (2012) until the end surface of the retaining pad (40) close to the compression spring (50) abuts against the shoulder portion (121).

9. The worm gear transmission mechanism according to claim 6, characterized in that: A bearing (70) for supporting the main shaft (10) is installed in the bearing receiving cavity (2013), and the bearing (70) limits the degrees of freedom of the main shaft (10) except for rotation and axial displacement.

10. The worm gear transmission mechanism according to any one of claims 2 to 5, characterized in that: The compression spring is a cylindrical helical compression spring wound from a steel wire, the inner diameter of the spring coil of which is set to be smaller than the circumferential outer diameter of the protrusion and the outer diameter of the spring coil is set to be larger than the circumferential inner diameter of the recess, so that the compression spring can apply elastic stress to the protrusion or the recess in the radial direction.

11. A driver, characterized in that: The drive comprises a motor (30) and a worm gear transmission mechanism according to any one of claims 1 to 10, wherein an input end of the main shaft (10) is connected to a rotor of the motor (30) so that the main shaft (10) can be driven by the motor (30) to rotate.

12. A vehicle window lifting system, characterized in that: Comprising a driver according to claim 11.

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