A slide rail screw driving structure capable of absorbing coaxiality deviation

Abstract

This utility model discloses a slide rail lead screw transmission structure capable of absorbing coaxiality deviation, including a lower rail, a lead screw rotatably mounted inside the lower rail, a drive motor fixedly mounted at one end of the lower rail, an output shaft connected to the drive motor, and a coupling connecting the output shaft and the end of the lead screw. The coupling includes an elastic body and a first connecting seat and a second connecting seat fixedly connected to both ends of the elastic body. The end of the output shaft is fixedly fitted into the first connecting seat, and the end of the lead screw is fixedly fitted into the second connecting seat. During the rotation of the lead screw driven by the drive motor, the elastic body in the middle of the coupling can absorb the coaxiality deviation between the output shaft and the lead screw. The beneficial effect is that when the drive motor drives the lead screw to rotate, the elastic body in the middle of the coupling can absorb the coaxiality deviation between the drive motor and the lead screw, thereby improving the smoothness of transmission and having the technical advantages of high transmission stability and low noise.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat slide rail technology, specifically to a slide rail lead screw transmission structure capable of absorbing coaxiality deviation. Background Technology

[0002] As people pay more and more attention to the passenger space of cars, modern car seats are equipped with sliding rails at the bottom to facilitate passenger adjustment, and the travel of the sliding rails is also getting longer and longer.

[0003] For long-stroke slide rails, screw drive is generally used. That is, a screw is set between the upper and lower rails, a gearbox is installed on the top of the upper rail, the gearbox is meshed with the screw, and a drive motor is installed at the far end of the gearbox. The drive motor drives the gearbox to rotate so that the upper rail slides relative to the lower rail.

[0004] As car seats become more functional, their overall structure becomes increasingly bulky. This leaves no extra space for the drive motor at the upper rail gearbox. As a result, the drive motor is placed at the end of the lower rail, directly driving the lead screw to rotate. The movement of the upper rail is achieved by using a nut sleeve that is threaded onto the lead screw.

[0005] The lead screw is rotatably mounted inside the lower slide rail via brackets at both ends. The motor is located at the end of the lower slide rail, and the motor output shaft is connected to the end of the lead screw for transmission, thus driving the lead screw to rotate. During the manufacturing and assembly of slide rail components, there are unavoidable factors such as component manufacturing tolerances and assembly tolerances, which cause coaxiality deviations between the lead screw and the motor output shaft, resulting in defects such as poor smoothness of slide rail transmission and high noise. Utility Model Content

[0006] In view of this, the present invention provides a slide rail lead screw transmission structure that can absorb coaxiality deviation, which can absorb the coaxiality deviation between the drive motor and the lead screw, ensuring smoother slide rail transmission and reducing noise generated during transmission.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A slide rail lead screw transmission structure capable of absorbing coaxiality deviation includes a lower rail, characterized in that: a lead screw is rotatably mounted inside the lower rail, a drive motor is fixedly mounted at one end of the lower rail, the drive motor is connected to an output shaft, the output shaft and the end of the lead screw are connected by a coupling, the coupling includes an elastic body and a first connecting seat and a second connecting seat fixedly connected to both ends of the elastic body, the end of the output shaft is fixedly fitted in the first connecting seat, and the end of the lead screw is fixedly fitted in the second connecting seat; during the process of the drive motor driving the lead screw to rotate, the elastic body in the middle of the coupling can absorb the coaxiality deviation between the output shaft and the lead screw.

[0009] With the above structure, the coupling between the lead screw and the drive motor can absorb the coaxiality deviation between the drive motor and the lead screw when the drive motor drives the lead screw to rotate, thereby improving the smoothness of transmission. It has the technical advantages of high transmission stability and low noise.

[0010] Preferably, the elastic body is a cylindrical helical spring. Using the above structure, the elastic force of the spring can absorb the coaxiality deviation between the drive motor and the lead screw, thereby improving the smoothness of the transmission device.

[0011] Preferably, positioning supports are provided at both ends of the lower rail along its length, and the front and rear ends of the lead screw are rotatably mounted inside the positioning supports. This structure ensures that the lead screw is stably mounted on the lower rail.

[0012] Preferably, the system also includes an upper rail that slides with the lower rail, and a nut sleeve is fixedly installed inside the upper rail. The nut sleeve is threaded onto the lead screw. When the lead screw at the front end of the drive motor rotates, the upper rail can reciprocate relative to the lower rail.

[0013] Preferably, the lead screw end is provided with a necking structure, which is rotatably supported within the positioning support by a self-lubricating sleeve. This structure ensures that the lead screw is stably supported on the positioning support.

[0014] Preferably, the positioning support includes a support portion, one end of which extends vertically upward to form a mounting portion. The bottom of the lower rail has a mounting clearance hole. The support portion is fixedly mounted to the bottom of the lower rail by bolts. The mounting portion extends upward through the mounting clearance hole into the interior of the lower rail. The necking structure is rotatably supported within the mounting portion by a self-lubricating sleeve. This structure makes the positioning support more stable and facilitates its installation.

[0015] Preferably, both the first and second connecting seats are cylindrical structures with the same diameter as the cylindrical helical spring. The end of the lead screw has the same diameter as the cylindrical helical spring. The outer end of the lead screw has an outwardly protruding connecting post, which passes through the second connecting seat. The second connecting seat has a fixing bolt arranged radially thereon, and the inner end of the fixing bolt abuts against the side wall of the connecting post. The output shaft has a rectangular cross-section near the coupling, and the first connecting seat has a square hole adapted to the cross-section of the output shaft. This structure, with its equal-diameter design, results in good overall appearance and high compactness. Combined with the self-lubricating sleeve supporting the necking structure, it enhances the connection strength of the lead screw at this end. The design of the output shaft end cross-section and the square hole on the first connecting seat ensures a stable connection between the output shaft and the coupling.

[0016] Preferably, the lower rail has inward-folding structures on both sides, and the upper rail has outward-folding structures on both sides, with the upper part of the outward-folding structures enclosed within the inward-folding structures. This structure ensures that the nut sleeve can move along the length of the lead screw when the lead screw rotates.

[0017] Preferably, a slider is provided between the outward-folding structure and the lower rail. This structure reduces wear caused by sliding between the upper and lower rails.

[0018] Preferably, the lower rail is provided with a cover plate at its top, and the upper rail is disposed in the area between the lower rail and the cover plate. With this structure, the cover plate effectively prevents foreign objects from falling into the lower rail and affecting the normal sliding of the upper rail.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The slide rail lead screw transmission structure provided by this utility model, which can absorb coaxiality deviation, uses a coupling between the lead screw and the drive motor. When the drive motor drives the lead screw to rotate, the elastic body in the middle of the coupling can absorb the coaxiality deviation between the drive motor and the lead screw, thereby improving the smoothness of transmission. It has the technical advantages of high transmission stability and low noise.

[0021] 2. A slider is installed between the upper and lower rails, which can effectively reduce the wear on the lower rail during the sliding process of the upper rail. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of a car seat slide rail;

[0023] Figure 2 for Figure 1 A cross-sectional view;

[0024] Figure 3 for Figure 2 A magnified view of part of I;

[0025] Figure 4 for Figure 2 A partially enlarged schematic diagram of section II;

[0026] Figure 5 This is a schematic diagram of the structure of coupling 6;

[0027] Figure 6 A partially enlarged schematic diagram showing the installation position of coupling 6;

[0028] Figure 7 for Figure 1 A cross-sectional view from another perspective;

[0029] Figure 8This is a schematic diagram of the slider 10. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0031] like Figures 1 to 7 As shown, a slide rail lead screw transmission structure capable of absorbing coaxiality deviation includes a lower rail 1, a lead screw 3 rotatably mounted inside the lower rail 1, a drive motor 5 fixedly mounted at one end of the lower rail 1, an output shaft 8 connected to the output end of the drive motor 5, and a coupling 6 connecting the output shaft 8 and the end of the lead screw 3. The coupling 6 includes an elastic body 6b and a first connecting seat 6a and a second connecting seat 6c fixedly connected to both ends of the elastic body 6b. The end of the output shaft 8 is fixedly fitted in the first connecting seat 6a, and the end of the lead screw 3 is fixedly fitted in the second connecting seat 6c. During the process of the drive motor 5 driving the lead screw 3 to rotate, the elastic body 6b in the middle of the coupling 6 can absorb the coaxiality deviation between the output shaft 8 and the lead screw 3.

[0032] With this design, the coupling 6 between the lead screw 3 and the drive motor 5 can effectively absorb the coaxiality deviation between the drive motor 5 and the lead screw 3 by utilizing the elasticity of the elastic body 6b in the middle of the coupling 6 when the drive motor 5 drives the lead screw 3 to rotate, thereby improving the smoothness of transmission. In addition, the elastic body 6b can also absorb the vibration generated when the lead screw 3 and the output shaft 8 rotate, which has the technical advantages of high transmission stability and low noise.

[0033] In this embodiment, the elastic body 6b is a cylindrical helical spring, which not only makes the structure of the coupling 6 more stable, but also provides sufficient elastic force, thereby helping to absorb the coaxiality deviation between the drive motor 5 and the lead screw 3.

[0034] like Figure 6 As shown, positioning supports 7 are provided at both ends of the lower rail 1 along its length, and the front and rear ends of the lead screw 3 are rotatably mounted inside the positioning supports 7. This design ensures that the lead screw 3 is stably mounted on the lower rail 1.

[0035] Specifically, the end of the lead screw 3 is provided with a necking structure 3b, which is rotatably supported in the positioning support 7 by a self-lubricating sleeve 14. The design of the self-lubricating sleeve 14 makes the rotation of the lead screw 3 smoother, and the design of the necking structure 3b makes the installation of the lead screw 3 more stable, thereby preventing the lead screw 3 from falling out of the positioning support 7.

[0036] Furthermore, the positioning support 7 includes a support portion 7a, one end of which extends vertically upward to a mounting portion 7b. The bottom of the lower rail 1 has a mounting clearance hole 1b. The support portion 7a is fixedly mounted to the bottom of the lower rail 1 by bolts. The mounting portion 7b extends upward through the mounting clearance hole 1b into the interior of the lower rail 1. The necking structure 3b is rotatably supported within the mounting portion 7b by a self-lubricating sleeve 14. This design makes the positioning support 7 structure more stable and facilitates its installation.

[0037] like Figure 4 As shown, both the first connecting seat 6a and the second connecting seat 6c are cylindrical structures with the same diameter as the cylindrical helical spring. The end of the lead screw 3 has the same diameter as the cylindrical helical spring. The outer end of the lead screw 3 has an outwardly protruding connecting post 3a, which passes through the second connecting seat 6c. The second connecting seat 6c has a threaded mounting hole 6c1 arranged radially therein, and a fixing bolt 9 is installed in the threaded mounting hole 6c1. The inner end of the fixing bolt 9 abuts against the side wall of the connecting post 3a. The end of the output shaft 8 near the coupling 6 has a rectangular cross-section, and the first connecting seat 6a has a square hole 6a1 that matches the cross-section of the output shaft 8. This design, with its equal diameter structure, results in a good overall appearance and high compactness. Combined with the self-lubricating sleeve support necking structure, it can improve the connection strength of the lead screw 3 at this end position. The end cross-section of the output shaft 8 and the square hole formed on the first connecting seat 6a can ensure a stable connection between the output shaft 8 and the coupling 6.

[0038] like Figure 3 As shown, the slide rail screw transmission mechanism also includes an upper rail 2 that slides with the lower rail 1. A nut sleeve 4 is fixedly installed inside the upper rail 2, and the nut sleeve 4 is threaded onto the screw 3. The drive motor 5 drives the screw 3 to rotate, which enables the upper rail 2 to slide back and forth relative to the lower rail 1.

[0039] Furthermore, such as Figure 7 As shown, the lower rail 1 has inward-folding structures 1a on both sides, and the upper rail 2 has outward-folding structures 2a on both sides. The upper part of the outward-folding structures 2a is enclosed within the inward-folding structures 1a. This design ensures that when the lead screw 3 rotates, the nut sleeve 4 can move along the length of the lead screw 3, thereby realizing the sliding of the upper rail 2. In addition, the inward-folding structures 1a and outward-folding structures 2a also prevent the upper rail 2 from easily detaching from the lower rail 1.

[0040] For example Figure 7 and Figure 8 As shown, a slider 10 is provided between the outward-folding structure 2a and the lower rail 1. The slider 10 can reduce the wear caused by sliding between the upper rail 2 and the lower rail 1.

[0041] Specifically, the slider 10 has a C-shaped structure, and the bottom and sides of the outward-curved structure 2a are supported on the slider 10. This design allows the upper rail 2 to slide only relative to the lower rail 1 by the slider 10, thereby avoiding wear caused by friction between the lower rail 1 and the upper rail 2.

[0042] In this embodiment, in order to further reduce the sliding wear between the lower rail 1 and the upper rail 2, the slider 10 is designed to be a plastic part, and weight-reducing grooves 10a are arrayed on both sides of the slider 10. The weight-reducing grooves 10a can effectively reduce the overall weight of the slider 10, ensuring that the upper rail 2 slides more smoothly.

[0043] like Figure 1 and Figure 7 As shown, a cover plate 11 is provided on the top of the lower rail 1, and the upper rail 2 is located in the area between the lower rail 1 and the cover plate 11. The cover plate 11 can effectively prevent foreign objects from falling into the lower rail 1 and affecting the normal sliding of the upper rail 2.

[0044] In this embodiment, the cover plate 11 is fixedly installed on the lower rail 1 by a buckle 12. Specifically, the buckle 12 has a U-shaped structure, and the cover plate 11 has downwardly extending extensions 11b on both sides in the width direction. The buckle 12 is installed at the bottom of the lower rail 1, and its two ends tightly press the extensions 11b against the sides of the lower rail 1.

[0045] like Figure 7 As shown, the top of the upper rail 2 has an upwardly extending mounting portion 2b, which is used to connect the car seat. In order to prevent the cover plate 11 from hindering the sliding of the upper rail 2, a strip-shaped clearance hole 11a extending along its length direction is provided in the middle of the cover plate 11, and the mounting portion 2b passes through the strip-shaped clearance hole 11a.

[0046] Furthermore, to prevent foreign objects from falling into the lower rail 1 through the strip-shaped clearance hole 11a, two elastic sealing strips 13 are provided on the strip-shaped clearance hole 11a, and the mounting part 2b is disposed between the two elastic sealing strips 13.

[0047] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A slide rail screw transmission structure capable of absorbing coaxiality deviation, comprising a lower rail (1), characterized in that: A lead screw (3) is rotatably mounted inside the lower rail (1). A drive motor (5) is fixedly mounted at one end of the lower rail (1). The drive motor (5) is connected to an output shaft (8). The output shaft (8) is connected to the end of the lead screw (3) via a coupling (6). The coupling (6) includes an elastic body (6b) and a first connecting seat (6a) and a second connecting seat (6c) fixedly connected to both ends of the elastic body (6b). The end of the output shaft (8) is fixedly fitted in the first connecting seat (6a), and the end of the lead screw (3) is fixedly fitted in the second connecting seat (6c). During the process of the drive motor (5) driving the lead screw (3) to rotate, the elastic body (6b) in the middle of the coupling (6) can absorb the coaxiality deviation between the output shaft (8) and the lead screw (3).

2. The slide rail lead screw transmission structure capable of absorbing coaxiality deviation according to claim 1, characterized in that: The elastic body (6b) is a cylindrical helical spring.

3. The slide rail lead screw transmission structure capable of absorbing coaxiality deviation according to claim 1, characterized in that: The lower rail (1) is provided with positioning supports (7) at both ends along its length, and the front and rear ends of the lead screw (3) are rotatably installed inside the positioning supports (7).

4. The slide rail lead screw transmission structure capable of absorbing coaxiality deviation according to claim 3, characterized in that: It also includes an upper rail (2) that slides with the lower rail (1), and a nut sleeve (4) is fixedly installed inside the upper rail (2). The nut sleeve (4) is threaded onto the lead screw (3). When the lead screw (3) at the front end of the drive motor (5) rotates, the upper rail (2) can slide back and forth relative to the lower rail (1).

5. The slide rail lead screw transmission structure capable of absorbing coaxiality deviation according to claim 3, characterized in that: The end of the lead screw (3) is provided with a necking structure, which is rotatably supported in the positioning support (7) by a self-lubricating sleeve (14).

6. The slide rail lead screw transmission structure capable of absorbing coaxiality deviation according to claim 5, characterized in that: The positioning support (7) includes a support part (7a), one end of which extends vertically upward to a mounting part (7b). The bottom of the lower rail (1) has a mounting clearance hole (1b). The support part (7a) is fixedly mounted on the bottom of the lower rail (1) by bolts. The mounting part (7b) extends upward through the mounting clearance hole (1b) into the interior of the lower rail (1). The necking structure is rotatably supported in the mounting part (7b) by a self-lubricating sleeve (14).

7. The slide rail lead screw transmission structure capable of absorbing coaxiality deviation according to claim 2, characterized in that: The first connecting seat (6a) and the second connecting seat (6c) are both cylindrical structures with the same diameter as the cylindrical helical spring. The end of the lead screw (3) has the same diameter as the cylindrical helical spring. The outer end of the lead screw (3) is provided with an outwardly protruding connecting post (3a). The connecting post (3a) passes through the second connecting seat (6c). The second connecting seat (6c) is provided with a fixing bolt (9) arranged radially thereon. The inner end of the fixing bolt (9) abuts against the side wall of the connecting post (3a). The output shaft (8) has a rectangular cross-section near the coupling (6), and the first connecting seat (6a) is provided with a square hole (6a1) that is adapted to the cross-section of the output shaft (8).

8. The slide rail lead screw transmission structure capable of absorbing coaxiality deviation according to claim 4, characterized in that: The lower rail (1) has inward-folding structures (1a) on both sides, and the upper rail (2) has outward-folding structures (2a) on both sides. The upper part of the outward-folding structures (2a) is enclosed within the inward-folding structures (1a).

9. The slide rail lead screw transmission structure capable of absorbing coaxiality deviation according to claim 8, characterized in that: A slider (10) is provided between the outward-turning structure (2a) and the lower rail (1).

10. The slide rail lead screw transmission structure capable of absorbing coaxiality deviation according to claim 4, characterized in that: The lower rail (1) is provided with a cover plate (11) at the top, and the upper rail (2) is located in the area between the lower rail (1) and the cover plate (11).

Images