Automobile seat electric sliding rail lead screw clearance eliminating mechanism

Abstract

The utility model provides an automobile seat electric sliding rail lead screw clearance eliminating mechanism which comprises a box body, a worm arranged in the box body and a bevel gear meshed with the worm, the left side of the bevel gear is connected with a locking nut, and fine threads meshed with each other are arranged on the periphery of the left side of the bevel gear and the inner wall of the right side of the locking nut. The inner wall of the left side of the locking nut and the inner wall of the bevel gear are provided with trapezoidal threads used for being meshed with the same lead screw correspondingly. The locking nut is arranged on the left side of the bevel gear, the locking nut and the bevel gear are connected together through fine threads, and trapezoidal threads used for being meshed with the same lead screw are arranged on the inner wall of the left side of the locking nut and the inner wall of the bevel gear correspondingly, so that the gap between the lead screw and the bevel gear can be reduced; therefore, the noise in the operation process is reduced; the shaking of the screw rod and the bevel gear during working is reduced; when the gap between the lead screw and the bevel gear is enlarged due to long-time operation of the lead screw, the position of the locking nut can be adjusted again, and the gap is reduced.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to a backlash elimination mechanism for an electric slide rail of an automotive seat. Background Technology

[0002] The backlash elimination mechanism for electric sliding rails in automotive seats is a mechanical device used to eliminate backlash during the screw drive process. It is mainly used in the electric adjustment systems of automotive seats. Its purpose is to improve the precision and stability of seat adjustment, ensuring that the seat does not become loose or wobble during movement.

[0003] During lead screw drive, due to manufacturing errors, wear, or insufficient assembly precision, a small gap may occur between the lead screw and the nut. This gap can cause the seat to become loose or wobble during adjustment, affecting the user experience. Utility Model Content

[0004] This utility model aims to provide a backlash-reducing mechanism for the lead screw of an electric sliding rail for automobile seats, which can reduce the gap between the lead screw and the helical gear, thereby reducing noise during operation and reducing the shaking of the lead screw and the helical gear during operation. When the gap between the lead screw and the helical gear increases due to long-term operation, it can be readjusted to reduce the gap.

[0005] Therefore, the technical solution adopted by this utility model is as follows: a backlash elimination mechanism for an electric sliding rail for an automobile seat, comprising a housing, a worm gear disposed within the housing, and a helical gear meshing with the worm gear. A locking nut is connected to the left side of the helical gear. Fine threads that mesh with each other are provided on the outer circumference of the left side of the helical gear and the inner wall of the right side of the locking nut. Trapezoidal threads for meshing with the same lead screw are respectively provided on the inner wall of the left side of the locking nut and the inner wall of the helical gear.

[0006] As a preferred embodiment of the above scheme, a locking screw is provided at the connection point between the left side of the helical gear and the locking nut.

[0007] More preferably, a first bearing is provided at the connection between the locking nut and the housing, and the first bearing is connected to the helical gear by a first metal washer. A second bearing is provided at the connection between the right side of the helical gear and the housing, and a second metal washer is provided between the second bearing and the helical gear.

[0008] More preferably, the box body includes an upper cover and a lower cover, which are connected by rivets.

[0009] A further preferred embodiment is that shock-absorbing pads are provided on the left and right sides of the housing.

[0010] The beneficial effects of this utility model are as follows: By setting a locking nut on the left side of the helical gear and connecting the locking nut and the helical gear together with fine thread, and setting trapezoidal threads for meshing with the same lead screw on the inner wall of the left side of the locking nut and the inner wall of the helical gear, the gap between the lead screw and the helical gear can be reduced, thereby reducing noise during operation; and reducing the shaking of the lead screw and the helical gear during operation; when the gap between the lead screw and the helical gear increases due to long-term operation of the lead screw, the position of the locking nut can be readjusted to reduce the gap. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 yes Figure 1 Enlarged views of points A and B in the image.

[0013] Figure 3 This is a schematic diagram of the locking nut in this utility model.

[0014] Figure 4 This is a schematic diagram of the helical gear in this utility model.

[0015] Figure 5 This is a schematic diagram of the installation of the locking nut and the helical gear in this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1-5 As shown, a backlash-eliminating mechanism for an electric sliding rail of an automotive seat includes a housing 2, a worm gear 5 disposed within the housing 2, and a helical gear 10 meshing with the worm gear 5. The housing 2 includes an upper cover and a lower cover, which are connected by rivets 7. Shock-absorbing pads 1 are provided on both sides of the housing 2. The shock-absorbing pads 1 can absorb and buffer vibrations generated during vehicle operation, preventing them from being directly transmitted to the passenger through the seat, thus improving ride comfort.

[0018] A locking nut 11 is connected to the left side of the helical gear 10. Fine-pitch threads that mesh with each other are provided on the outer circumference of the left side of the helical gear 10 and the inner wall of the locking nut 11. A locking screw 12 is provided at the connection between the left side of the helical gear 10 and the locking nut 11. The locking screw 12 is provided to lock the fine-pitch threads between the helical gear 10 and the locking nut 11, thereby improving the stability of the connection.

[0019] Trapezoidal threads for meshing with the same lead screw 8 are respectively provided on the inner wall of the left side of the locking nut 11 and the inner wall of the helical gear 10. A first bearing 4 is provided at the connection between the locking nut 11 and the housing 2. The first bearing 4 is connected to the helical gear 10 by a first metal washer 3. A second bearing 9 is provided at the connection between the right side of the helical gear 10 and the housing 2. A second metal washer 6 is provided between the second bearing 9 and the helical gear 10. The first bearing 4 and the second bearing 9 are connected inside the housing 2. Both the first bearing 4 and the second bearing 9 are plastic bearings. Plastic bearings have self-lubricating properties and can work under oil-free or low-oil conditions, effectively reducing friction and wear, extending service life, and reducing friction between the helical gear 10 and the locking nut 11 and the housing 2 when the lead screw 8 rotates.

[0020] By setting a locking nut 11 on the left side of the helical gear 10 and connecting the locking nut 11 to the helical gear 10 with a fine thread, and setting trapezoidal threads on the inner wall of the left side of the locking nut 11 and the inner wall of the helical gear 10 for meshing with the same lead screw 8, the gap between the lead screw 8 and the helical gear 10 can be reduced, thereby reducing noise during operation; and reducing the shaking of the lead screw 8 and the helical gear 10 during operation; when the gap between the lead screw 8 and the helical gear 10 increases due to long-term operation of the lead screw 8, the position of the locking nut 11 can be readjusted to reduce the gap.

[0021] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A backlash elimination mechanism for an electric slide rail of an automobile seat, characterized in that: The device includes a housing (2), a worm gear (5) disposed inside the housing (2), and a helical gear (10) meshing with the worm gear (5). A locking nut (11) is connected to the left side of the helical gear (10). Fine threads that mesh with each other are provided on the outer circumference of the left side of the helical gear (10) and the inner wall of the right side of the locking nut (11). Trapezoidal threads for meshing with the same lead screw (8) are respectively provided on the inner wall of the left side of the locking nut (11) and the inner wall of the helical gear (10).

2. The backlash elimination mechanism for an electric slide rail of an automobile seat according to claim 1, characterized in that: A locking screw (12) is provided at the connection between the left side of the helical gear (10) and the locking nut (11).

3. The backlash elimination mechanism for an electric slide rail of an automobile seat according to claim 1, characterized in that: A first bearing (4) is provided at the connection between the locking nut (11) and the housing (2). The first bearing (4) is connected to the helical gear (10) by a first metal washer (3). A second bearing (9) is provided at the connection between the right side of the helical gear (10) and the housing (2). A second metal washer (6) is provided between the second bearing (9) and the helical gear (10).

4. The backlash elimination mechanism for an electric slide rail of an automobile seat according to claim 1, characterized in that: The box (2) includes a top cover and a bottom cover, which are connected by rivets (7).

5. The backlash elimination mechanism for an electric slide rail of an automobile seat according to claim 1, characterized in that: The box (2) is provided with shock-absorbing pads (1) on the left and right sides.

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