High-stability lead screw for adjusting automobile seat

Abstract

The utility model discloses a high-stability lead screw for adjusting an automobile seat, which comprises a lead screw body, mounting parts are arranged on two sides of a threaded part of the lead screw body, the lead screw body is rotatably connected with a bearing on an external supporting seat, and an axial limiting mechanism is arranged between the external supporting seat and the lead screw body; the axial limiting mechanism comprises a square groove formed in the upper end and the lower end of the outer wall of the mounting part on one side, a strong pressure spring and a limiting block are installed in the square groove, an annular groove is formed in the inner wall of the external supporting seat, and the outer end of the limiting block abuts against the interior of the annular groove under extrusion of the strong pressure spring; ball grooves are formed in the two sides of the top end of the limiting block, and balls rotate in the ball grooves; the lead screw is clamped in the annular groove through the limiting block to provide limiting, the lead screw cannot be reset and disengaged under the action of the strong pressure spring, axial limiting is carried out, and stability is high; when the limiting block moves relative to the external supporting seat, axial limiting and supporting are achieved through the balls, and meanwhile relative movement friction is reduced; and the limiting blocks are not in contact with the annular grooves, so that friction in the using process is further reduced.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, specifically relating to a highly stable lead screw for adjusting automotive seats. Background Technology

[0002] Car seats can be adjusted via a lead screw. The principle is to use a screw drive to convert rotational motion into linear motion. The lead screw is usually mounted on the external support of the seat through a bearing. The seat is adjusted by moving synchronously with the lead screw pair fixedly connected to the lead screw, thereby achieving precise adjustment of the seat position (such as height, fore-aft position, or lumbar support).

[0003] Lead screws, especially precision ball screws, can provide high-precision, smooth linear motion and have good self-locking properties, eliminating the need for additional braking. With the development of electrification and intelligence, the application of lead screws or similar precision transmission mechanisms has increased significantly, especially in the active adjustment of autonomous driving seats.

[0004] However, in actual operation, the lead screw is usually mounted on the external support of the seat through a bearing, which lacks stable axial positioning and thus has poor stability, making it unsuitable for long-term precision adjustment. Utility Model Content

[0005] This utility model provides a highly stable lead screw for adjusting a car seat. The lead screw is limited by a limiting block that is locked in an annular groove and will not reset or disengage under the action of a strong compression spring, thus providing axial limiting and high stability. When the limiting block moves relative to the external support seat, the ball bearings provide axial limiting support and reduce relative motion friction, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a highly stable lead screw for adjusting a car seat, comprising a lead screw body, wherein mounting portions are respectively provided on both sides of the threaded portion of the lead screw body, and the mounting portions are rotatably connected to bearings on an external support seat; a spline groove is provided at the head end of the lead screw body, and an axial limiting mechanism is provided between the external support seat and the lead screw body.

[0007] Preferably, the lead screw body is a hollow structure along the axis.

[0008] Preferably, the axial limiting mechanism includes square grooves at the upper and lower ends of the outer wall of the mounting part on one side, a strong compression spring and a limiting block are installed in the square groove, and the inner wall of the external support seat is provided with an annular groove corresponding to the square groove. Under the compression of the strong compression spring, the outer end of the limiting block is pressed against the annular groove.

[0009] Preferably, the outer wall of the bottom end of the limiting block is smoothly fitted to the square groove, while the diameter of the top end is smaller than that of the bottom end.

[0010] Preferably, the top two sides of the limiting block are provided with ball grooves, and balls rotate thereon, the balls being in contact with the inner wall of the annular groove.

[0011] Preferably, the width of the innermost end of the annular groove is smaller than the width of the outer opening, and the ball is located at the junction of the inner and outer sides of the annular groove under the compression of the strong compression spring, so that the top of the limiting block does not contact the annular groove.

[0012] Preferably, the external support base is provided with a through hole that passes through the annular groove.

[0013] Preferably, the square groove is provided with a positioning post, the strong compression spring is sleeved on the positioning post, and the bottom end of the limiting block is provided with a positioning groove for the head end of the strong compression spring to be installed.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The lead screw is limited by a limiting block that is locked in the annular groove. Under the action of a strong compression spring, it will not reset or disengage, thus providing axial limiting and high stability.

[0016] 2. When the limiting block moves relative to the external support seat, the ball bearings provide axial limiting support and reduce relative motion friction.

[0017] 3. By preventing the limiting block from contacting the annular groove, friction during use is further reduced. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the front sectional view of the present invention;

[0019] Figure 2 for Figure 1 A magnified structural diagram at point A;

[0020] Figure 3 This is a schematic diagram of the external structure of the lead screw body of this utility model.

[0021] In the diagram: 1. Lead screw body; 2. Threaded part; 3. Mounting part; 4. External support seat; 5. Bearing; 6. Square groove; 7. Strong compression spring; 8. Limiting block; 9. Annular groove; 10. Ball; 11. Through hole; 12. Positioning pin; 13. Positioning groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-3 This utility model provides a highly stable lead screw for adjusting a car seat, including a lead screw body 1. The lead screw body 1 has mounting portions 3 on both sides of the threaded portion 2, and is rotatably connected to bearings 5 ​​on an external support base 4 via the mounting portions 3. The lead screw body 1 has a spline groove at its head end, and an axial limiting mechanism is provided between the external support base 4 and the lead screw body 1. The lead screw body 1 is connected to an external power motor via the spline groove, and is rotatably mounted on the external support base 4 of the seat via the bearings 5. The seat is adjusted by moving synchronously with the lead screw pair fixedly connected to the threaded portion 2, thereby achieving precise adjustment of the seat position (such as height, fore-aft position, or lumbar support). During this process, axial limiting is used to prevent axial slippage and improve stability.

[0024] Specifically, the lead screw body 1 is a hollow structure along the axis; in this embodiment, under the same weight, the hollow structure has a larger moment of inertia, better bending resistance, and further improves stability.

[0025] Specifically, the axial limiting mechanism includes square grooves 6 located at the upper and lower ends of the outer wall of the mounting part 3 on one side. A strong compression spring 7 and a limiting block 8 are installed in the square grooves 6. The inner wall of the external support base 4 is provided with an annular groove 9 corresponding to the square grooves 6. The outer end of the limiting block 8 is pressed into the annular groove 9 by the strong compression spring 7. In this embodiment, the limiting block 8 is stuck in the annular groove 9 to provide limiting, and it will not reset or disengage under the action of the strong compression spring 7, thus performing axial limiting.

[0026] Specifically, the bottom outer wall of the limiting block 8 is smoothly fitted to the square groove 6, and the top diameter is smaller than the bottom diameter; in this embodiment, the top diameter being smaller than the bottom diameter provides space for installing the ball bearing 10, while the ball bearing 10 can fully enter the square groove 6.

[0027] Specifically, the top two sides of the limiting block 8 are provided with ball grooves and rotating balls 10, which fit against the inner wall of the annular groove 9; in this embodiment, when the limiting block 8 moves relative to the external support seat 4, the balls 10 provide axial limiting support and reduce relative motion friction.

[0028] Specifically, the width of the innermost end of the annular groove 9 is smaller than the width of the outer opening, and the ball bearing 10 is located at the junction of the inner and outer sides of the annular groove 9 under the compression of the strong compression spring 7, so that the top of the limiting block 8 does not contact the annular groove 9; in this embodiment, friction during use is reduced by the limiting block 8 not contacting the annular groove 9.

[0029] Specifically, the external support base 4 is provided with a through hole 11 that passes through the annular groove 9; in this embodiment, when disassembly is required, the upper and lower limiting blocks 8 can be pressed into the square groove 6 through the through hole 11 by the external component, and disassembly can be completed.

[0030] Specifically, the square groove 6 is provided with a positioning post 12, the strong compression spring 7 is sleeved on the positioning post 12, and the bottom end of the limiting block 8 is provided with a positioning groove 13 for the head end of the strong compression spring 7 to be installed; in this embodiment, the positioning of the strong compression spring 7 during extension and retraction is enhanced to prevent it from shifting and to make it more stable.

[0031] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0032] Working principle: The lead screw body 1 is rotatably mounted on the outer support seat 4 of the seat via the bearing 5. The seat is adjusted synchronously with the lead screw pair on the fixed connection threaded part 2, thereby achieving precise adjustment of the seat position (such as height, fore-aft or lumbar support). During this process, axial limiting mechanism is used to limit axial movement and prevent axial slippage, thereby improving stability. Specifically, the limiting block 8 is engaged in the annular groove 9 to provide limiting, and will not return to its original position under the action of the strong compression spring 7, thus providing axial limiting. When the limiting block 8 moves relative to the outer support seat 4, the ball bearing 10 provides axial limiting support and reduces relative movement friction. The fact that the limiting block 8 does not contact the annular groove 9 reduces friction during use.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A highly stable lead screw for adjusting a car seat, comprising a lead screw body (1), characterized in that, The lead screw body (1) is provided with mounting parts (3) on both sides of the threaded part (2), and is rotatably connected to the bearing (5) on the external support seat (4) through the mounting parts (3); the head end of the lead screw body (1) is provided with a spline groove, and an axial limiting mechanism is provided between the external support seat (4) and the lead screw body (1).

2. The high-stability car seat adjustment screw according to claim 1, characterized in that, The lead screw body (1) is a hollow structure along the axis.

3. The high-stability car seat adjustment screw according to claim 1, characterized in that, The axial limiting mechanism includes a square groove (6) located at the upper and lower ends of the outer wall of the mounting part (3) on one side. A strong compression spring (7) and a limiting block (8) are installed in the square groove (6). The inner wall of the external support base (4) is provided with an annular groove (9) corresponding to the square groove (6). The outer end of the limiting block (8) is pressed into the annular groove (9) by the strong compression spring (7).

4. The high-stability car seat adjustment lead screw according to claim 3, characterized in that, The bottom outer wall of the limiting block (8) is smoothly fitted with the square groove (6), while the top diameter is smaller than the bottom diameter.

5. A high-stability car seat adjustment lead screw according to claim 4, characterized in that, The top two sides of the limiting block (8) are provided with ball grooves and rotating balls (10), which are in contact with the inner wall of the annular groove (9).

6. The high-stability lead screw for adjusting a car seat according to claim 5, characterized in that, The width of the innermost end of the annular groove (9) is smaller than the width of the outer opening. The ball (10) is located at the junction of the inner and outer sides of the annular groove (9) under the compression of the strong compression spring (7), so that the top of the limiting block (8) does not contact the annular groove (9).

7. The high-stability car seat adjustment lead screw according to claim 5, characterized in that, The external support base (4) is provided with a through hole (11) that passes through the annular groove (9).

8. A high-stability car seat adjustment lead screw according to claim 5, characterized in that, The square groove (6) is provided with a positioning post (12), the strong compression spring (7) is sleeved on the positioning post (12), and the bottom end of the limiting block (8) is provided with a positioning groove (13) for the head end of the strong compression spring (7) to be installed.

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