A leg rest drive device for a vehicle seat

Abstract

An automotive seat leg rest drive device includes a power device, a transmission mechanism, an output screw, a slider nut, and a housing. The output screw is drivingly connected to the power device through the transmission mechanism. The slider nut is connected to the output screw. The housing is sleeved outside the slider nut and can move up and down and / or back and forth. A connection structure for connecting to the leg rest is provided on the housing. The housing of this automotive seat leg rest drive device can move a certain distance up and down and back and forth to adapt to the movement or distortion of the output screw in these two directions, ensuring that the leg rest can be installed at a predetermined position without stalling or jamming, etc., and at the same time preventing the output screw from bending and deforming.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive parts, and particularly relates to a leg rest driving device for an automotive seat. Background Art

[0002] The leg rest of an automotive seat can increase the leg support area for the occupant, thereby reducing the fatigue during long - distance rides and improving the riding comfort. The leg rest is usually driven in an electric form to extend and retract. Among them, the driving device is an essential important device for realizing the electric extension and retraction function of the leg rest. In the prior art, the driving device includes an output screw rod and a slider thread - connected to the output screw rod. One end of the output screw rod is connected to the power device, the other end of the output screw rod is a cantilever structure, and the slider is connected to the leg rest. The power device drives the output screw rod to rotate, so that the slider moves axially along the output screw rod, and then the leg rest extends and retracts. After the slider is locked with the leg rest, due to the cantilever structure of the output screw rod and the vertical and horizontal position errors in the installation of the driving device and the leg rest, when the leg rest extends to the end of the output screw rod, deformation is likely to occur, and it is even impossible to ensure the vertical and horizontal position errors of the slider and the leg rest during the movement process, resulting in phenomena such as jamming and insufficient thrust during the extension and retraction movement of the leg rest and problems such as deformation and bending of the output screw rod. Therefore, it is necessary to provide a leg rest driving device for an automotive seat. Summary of the Invention

[0003] The purpose of the present invention is to provide a leg rest driving device for an automotive seat, which solves the problems raised in the above - mentioned background art.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a leg rest driving device for an automotive seat, including a power device, a transmission mechanism, an output screw rod, a slider nut and a housing. The output screw rod is in transmission connection with the power device through the transmission mechanism. The slider nut is connected to the output screw rod. The housing is sleeved outside the slider nut in a vertically and / or horizontally movable manner, and a connection structure for connecting with the leg rest is provided on the housing.

[0005] On the basis of the above - mentioned scheme and as a preferred scheme of the above - mentioned scheme, the left and right sides of the slider nut are in contact with the inside of the housing, and there are movable gaps between the upper and lower sides and / or the front and rear sides of the slider nut and the housing.

[0006] On the basis of the above - mentioned scheme and as a preferred scheme of the above - mentioned scheme, the size of the movable gap is 0.5 mm to 10 mm.

[0007] On the basis of the above - mentioned scheme and as a preferred scheme of the above - mentioned scheme, the transmission mechanism includes a mutually meshing turbine and worm. The turbine is connected to the output screw rod, and the worm is connected to the power device.

[0008] Based on the above solution and as a preferred solution of the above solution, the transmission mechanism further includes a box body and a box cover, and the turbine and the worm are located in the cavity formed by the box body and the box cover.

[0009] Based on the above solution and as a preferred solution of the above solution, the box body and the box cover are connected by buckles.

[0010] Based on the above solution and as a preferred solution of the above solution, a retaining sleeve is fixedly provided on the output screw. The retaining sleeve is located between the outer shell and the box body, and the retaining sleeve is located on the side close to the box body and has a gap with the box body.

[0011] Based on the above solution and as a preferred solution of the above solution, the outer shell includes a first shell and a second shell. The slide nut is arranged in the cavity formed by the first shell and the second shell, and the first shell and the second shell are connected by buckles.

[0012] Based on the above solution and as a preferred solution of the above solution, the power device is a motor.

[0013] Based on the above solution and as a preferred solution of the above solution, a bushing is provided between the output screw and the box body, and bushings are provided at both ends of the turbine; a riveting sleeve is provided at the end of the output screw.

[0014] The beneficial effects of the present invention are as follows: The outer shell of this leg rest driving device for automobile seats can move up and down and back and forth a certain distance to adapt to the movement or distortion of the output screw in these two directions, ensuring that the leg rest can be installed at a predetermined position without stalling or jamming, etc. At the same time, it can also prevent the output screw from bending and deforming; a retaining sleeve is provided on the side of the output screw close to the box body to prevent the outer shell or the slide nut from directly contacting the box body, resulting in locking of the output screw, the slide nut and the box body and generating a large frictional torque, thereby avoiding jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic structural diagram of the present invention.

[0017] Figure 2 It is a cross-sectional view of the present invention.

[0018] Figure 3This is a schematic structural view of the present invention after removing the box body and the box cover.

[0019] Figure 4 It is a cross-sectional view of the outer housing.

[0020] The reference numerals are as follows:

[0021] 1. Output screw; 2. Slide block nut; 3. Turbine; 4. Worm; 5. Box body; 6. Box cover; 7. First housing; 8. Second housing; 9. Motor; 10. Sleeve; 11. Moving gap; 12. Retaining sleeve; 13. Riveting sleeve. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] As shown in the attached Figure 1 to the attached Figure 4 As shown, an automotive seat leg rest driving device includes a power device, a transmission mechanism, an output screw 1, a slide block nut 2 and an outer housing. The output screw 1 is in transmission connection with the power device through the transmission mechanism. The slide block nut 2 is connected to the output screw 1. The outer housing is sleeved outside the slide block nut 2 so as to be movable up and down and / or back and forth. A connection structure for connecting with the leg rest is provided on the outer housing.

[0025] The left and right sides of the slide block nut 2 are in contact with the inside of the outer housing, and a moving gap 11 is left between the upper and lower sides and / or the front and rear sides of the slide block nut 2 and the outer housing.

[0026] The size of the moving gap 11 is from 0.5 mm to 10 mm.

[0027] During use, the leg support is connected to the outer housing. Since there are movable gaps between the upper and lower sides and the front and rear sides of the outer housing and the slide block nut, the outer housing can move a certain distance in the up-down and front-back directions, so as to adapt to the movement or distortion of the output screw in these two directions, ensuring that the leg support can be installed at a predetermined position without phenomena such as jamming or seizure, and at the same time preventing the output screw from bending and deforming. During the movement of the slide block nut and the output screw, the slide block nut is not affected by the radial runout of the output screw, and the slide block nut itself has the function of runout compatibility.

[0028] The transmission mechanism includes a mutually meshing turbine 3 and a worm 4. The turbine 3 is connected to the output screw 1, and the worm 4 is connected to the power device. The transmission connection is achieved through the turbine and the worm, which can not only reduce the speed but also increase the output torque.

[0029] The transmission mechanism further includes a box body 5 and a box cover 6. The turbine 3 and the worm 4 are located in the cavity formed by the box body 5 and the box cover 6.

[0030] The box body 5 and the box cover 6 are connected by a buckle, which can avoid using fasteners such as screws for connection and improve the assembly efficiency.

[0031] A retaining sleeve 12 is fixedly provided on the output screw 1. The retaining sleeve 12 is located between the outer housing and the box body 5, and the retaining sleeve 12 is located on the side close to the box body 5 and has a gap with the box body 5. When the slide block nut retracts to the head end of the output screw, the outer housing or the slide block nut can be blocked by the retaining sleeve to avoid large frictional torque generated by the locking of the screw, the slide block and the transmission mechanism when the slide block nut retracts to the head end, ensuring that the leg support can be installed at a predetermined position without phenomena such as jamming or seizure.

[0032] The outer housing includes a first housing 7 and a second housing 8. The slide block nut 2 is arranged in the cavity formed by the first housing 7 and the second housing 8. The first housing 7 and the second housing 8 are connected by a buckle, which is convenient for sleeving and installing the outer housing outside the output screw.

[0033] The power device is a motor 9.

[0034] A shaft sleeve 10 is provided between the output screw 1 and the box body 5, and shaft sleeves 10 are provided at both ends of the turbine 3, which can avoid direct contact between the output screw and the box body and cause mutual wear, and improve the service life of the output screw and the box body.

[0035] A riveting sleeve 13 is provided at the end of the output screw 1, which is convenient for connecting with the leg support.

[0036] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automotive seat leg rest driving device, characterized in that: It includes a power device, a transmission mechanism, an output screw rod (1), a slide block nut (2) and a housing. The output screw rod (1) is in transmission connection with the power device through the transmission mechanism. The slide block nut (2) is connected to the output screw rod (1). The housing is sleeved outside the slide block nut (2) in a vertically and / or horizontally movable manner. A connection structure for connecting with a leg rest is provided on the housing; The left and right sides of the slide block nut (2) are in contact with the inside of the housing, and an activity gap (11) is left between the upper and lower sides and / or the front and rear sides of the slide block nut (2) and the housing; The housing includes a first housing (7) and a second housing (8). The slide block nut (2) is arranged in a cavity formed by the first housing (7) and the second housing (8). The first housing (7) and the second housing (8) are connected by a buckle.

2. The automotive seat leg rest driving device according to claim 1, characterized in that: The size of the activity gap (11) is 0.5 mm to 10 mm.

3. The automotive seat leg rest driving device according to claim 1, characterized in that: The transmission mechanism includes a mutually meshing worm wheel (3) and a worm (4). The worm wheel (3) is connected to the output screw rod (1), and the worm (4) is connected to the power device.

4. The automotive seat leg rest driving device according to claim 3, characterized in that: The transmission mechanism further includes a box body (5) and a box cover (6). The worm wheel (3) and the worm (4) are located in a cavity formed by the box body (5) and the box cover (6).

5. The automotive seat leg rest driving device according to claim 4, characterized in that: The box body (5) and the box cover (6) are connected by a buckle.

6. The automotive seat leg rest driving device according to claim 4, characterized in that: A retaining sleeve (12) is fixedly arranged on the output screw rod (1). The retaining sleeve (12) is located between the housing and the box body (5), and the retaining sleeve (12) is located on the side close to the box body (5) and has a gap with the box body (5).

7. The automotive seat leg rest driving device according to claim 1, characterized in that: The power device is a motor (9).

8. The automotive seat leg rest driving device according to claim 3, characterized in that: A bushing (10) is arranged between the output screw rod (1) and the box body (5), and bushings (10) are arranged at both ends of the worm wheel (3); A riveting sleeve (13) is arranged at the end of the output screw rod (1).

Images