Sliding rail driving device and automobile seat

Abstract

The utility model belongs to the technical field of automobile seats, and provides a slide rail driving device and an automobile seat, the device comprises a track mechanism and a driving mechanism, the track mechanism comprises a first guide rail and a second guide rail which are arranged in parallel, a first lead screw is arranged in the first guide rail, and a second lead screw is arranged in the second guide rail; the driving mechanism comprises a power frame erected between the first guide rail and the second guide rail, a motor installed on the power frame, and a first gear box and a second gear box which are arranged at the two ends of the power frame, and a first transmission shaft and a second transmission shaft are coaxially arranged at the two axial ends of the motor correspondingly; a first input gear, a first idle gear and a first output gear are arranged in the first gearbox, the first input gear is connected with the first transmission shaft, the first output gear is connected with the first lead screw, a second input gear and a second output gear are arranged in the second gearbox, and the second input gear is connected with the second transmission shaft. And the second output gear is connected with the second lead screw, universality is good, and noise is low.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle seats, and particularly relates to a slide rail driving device and a vehicle seat. Background Art

[0002] For the slide rail adjustment of an electric vehicle seat, a horizontal slide rail driving device is usually used. A motor provides torque power to drive the seat to move along the horizontal slide rail. Generally, there are two slide rails, which are arranged along the axial direction of the vehicle body and symmetrically arranged on both sides of the bottom of the seat. For a slide rail mechanism configured with an electric drive function, the drive motor is installed between the two slide rails by using a mounting bracket, and is matched with the gear boxes on both sides of the slide rail through a horizontally arranged transmission shaft to achieve driving.

[0003] Generally, the left and right slide rails are on the same horizontal plane. However, in some special cases, due to the height difference of the vehicle interior floor, the left and right slide rails cannot be arranged on the same horizontal plane, that is, there is a height difference between the left and right slide rails. Currently, the conventional method in the industry is to connect the motor and the gear box on the slide rail with a lower height on one side through a bent flexible shaft. Although this method solves the problem of the height difference between the left and right slide rails, when the slide rail runs, the bent flexible shaft will generate abnormal noise, affecting the user experience.

[0004] The technical problem to be solved by this application is: how to solve the problem that the left and right guide rails of the existing vehicle seat have a height difference, which affects the user experience. Content of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a slide rail driving device, which can solve the problem of the height difference between the guide rails on both sides of the vehicle seat and can avoid generating abnormal noise.

[0006] The technical solution adopted by the present utility model is as follows: A slide rail driving device includes a track mechanism and a driving mechanism. The track mechanism includes a first guide rail and a second guide rail arranged in parallel. A first lead screw is arranged in the first guide rail, and a second lead screw is arranged in the second guide rail. The driving mechanism includes a power frame erected between the first guide rail and the second guide rail, a motor installed on the power frame, and a first gear box and a second gear box arranged at both ends of the power frame. A first transmission shaft and a second transmission shaft are coaxially arranged at both axial ends of the motor respectively. The first gear box and the second gear box have the same transmission ratio. Inside the first gear box, a first input gear, a first idler gear, and a first output gear are sequentially arranged along the height direction. The first input gear is connected to the first transmission shaft, and the first output gear is connected to the first lead screw. Inside the second gear box, a second input gear and a second output gear are sequentially arranged along the height direction. The second input gear is connected to the second transmission shaft, and the second output gear is connected to the second lead screw. The central axes of the first output gear and the second output gear are coaxial or have a height difference.

[0007] For the slide rail driving device of the present application, by arranging the first gear box on the first guide rail at the lower position side and making the input gears of the first gear box and the second gear box coaxial, the first transmission shaft and the second transmission shaft can maintain coaxial and smooth transmission, which can adapt to the situation where there is a height difference between the guide rails on both sides of some vehicle models. And according to the height difference between the first guide rail and the second guide rail, the height dimension of the first gear box is designed to match different height differences, with good versatility and low noise, which is beneficial to improving the user experience. Moreover, the first gear box and the second gear box have the same transmission ratio, which can ensure the synchronization of the transmission of the first lead screw and the second lead screw, making the seat translation smoother.

[0008] In some embodiments, a second idler gear is further arranged inside the second gear box, and the second idler gear is arranged between the second input gear and the second output gear.

[0009] Adopting the above technical solution, when the height difference between the first guide rail and the second guide rail is large, the second idler gear can be arranged inside the second gear box to ensure that both ends of the power frame remain horizontal; or when sufficient space needs to be reserved for the layout of the vehicle seat, the second idler gear is also arranged inside the second gear box to raise the power frame and the motor to obtain more sufficient space.

[0010] In some embodiments, both the first transmission shaft and the second transmission shaft are flexible shafts.

[0011] Adopting the above technical solution, the flexible shaft transmission has high transmission efficiency and accuracy, and at the same time can reduce the vibration and noise between devices, which is beneficial to reducing the noise when the seat slides.

[0012] In some embodiments, the input interfaces of the first gearbox and the second gearbox are the same, and the output interfaces of the first gearbox and the second gearbox are the same.

[0013] By adopting the above technical solution, the universality is improved, and it can better match the drive shaft and the lead screw.

[0014] In some embodiments, the first gearbox further includes a first housing, the second gearbox further includes a second housing, and the first housing and the second housing are respectively connected to two ends of the power frame.

[0015] In some embodiments, the first guide rail includes a first lower rail and a first upper rail. The first upper rail is slidably connected to the first lower rail. The first lead screw is installed on the first lower rail. The first output gear is in transmission connection with the first lead screw. The first housing is connected to the first upper rail;

[0016] The second guide rail includes a second lower rail and a second upper rail. The second upper rail is slidably connected to the first lower rail. The second lead screw is installed on the second lower rail. The second output gear is in transmission connection with the second lead screw. The second housing is connected to the second upper rail.

[0017] In some embodiments, the drive mechanism further includes a first connection bracket and a second connection bracket. The first connection bracket connects the first housing and the first upper rail, and the second connection bracket connects the second housing and the second upper rail.

[0018] By adopting the above technical solution, it is convenient to fix the first housing on the first upper rail and fix the second housing on the second upper rail.

[0019] In some embodiments, the first connection bracket is provided with a first accommodation cavity for accommodating the first housing and a first connection piece connected to the first upper rail. The second connection bracket is provided with a second accommodation cavity for accommodating the second housing and a second connection piece connected to the second upper rail.

[0020] By adopting the above technical solution, by providing the first accommodation cavity for accommodating the first housing on the first connection bracket, the contact area between the first connection bracket and the first housing can be increased, and the first housing can be restricted in multiple directions, which is beneficial to reducing the vibration of the first gearbox and improving the reliability. Similarly, the structure of the second connection bracket can reduce the vibration of the second gearbox and improve the reliability.

[0021] An automobile seat includes a seat body and the slide rail driving device of any one of the above.

[0022] The automobile seat with the above slide rail driving device also has the advantages of the above slide rail driving device. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the slide rail driving device of the first embodiment of the present invention;

[0024] Figure 2 is Figure 1 A schematic structural view of another perspective of the slide rail driving device shown;

[0025] Figure 3 is Figure 2 A schematic structural view of a partial section of the slide rail driving device shown;

[0026] Figure 4 is Figure 1 A schematic structural view of the first connecting bracket in the slide rail driving device shown;

[0027] Figure 5 is a schematic structural view of the slide rail driving device according to the second embodiment of the present invention.

[0028] In the figure: 100, slide rail driving device; 10, track mechanism; 11, first guide rail; 111, first lower rail; 112, first upper rail; 113, first lead screw; 12, second guide rail; 121, second lower rail; 122, second upper rail; 123, second lead screw; 20, driving mechanism; 21, power frame; 22, motor; 23, first transmission shaft; 24, second transmission shaft; 25, first gear box; 251, first box body; 252, first input gear; 253, first idler gear; 254, first output gear; 26, second gear box; 261, second box body; 262, second input gear; 263, second output gear; 264, second idler gear; 27, first connecting bracket; 271, first accommodating cavity; 272, first connecting piece; 28, second connecting bracket. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. When the number of an element is referred to as having "a plurality", it can be any number of two or more. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manners.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs. The terms used in the specification of this utility model herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] First Embodiment:

[0033] Please refer to Figures 1 to 4 , a slide rail driving device 100 of the first embodiment of this utility model, which includes a track mechanism 10 and a driving mechanism 20. The track mechanism 10 includes a first guide rail 11 and a second guide rail 12 arranged in parallel. A first lead screw 113 is arranged in the first guide rail 11, and a second lead screw 123 is arranged in the second guide rail 12. The driving mechanism 20 includes a power frame 21 erected between the first guide rail 11 and the second guide rail 12, a motor 22 installed on the power frame 21, and a first gear box 25 and a second gear box 26 arranged at both ends of the power frame 21. First transmission shafts 23 and second transmission shafts 24 are coaxially arranged at both axial ends of the motor 22 respectively. The first gear box 25 and the second gear box 26 have the same transmission ratio. Inside the first gear box 25, a first input gear 252, a first idler gear 253, and a first output gear 254 are sequentially arranged in the height direction. The first input gear 252 is connected to the first transmission shaft 23, and the first output gear 254 is connected to the first lead screw 113. Inside the second gear box 26, a second input gear 262 and a second output gear 263 are sequentially arranged in the height direction. The second input gear 262 is connected to the second transmission shaft 24, and the second output gear 263 is connected to the second lead screw 123. The central axis of the first output gear 254 and the central axis of the second output gear 263 are coaxial or have a height difference.

[0034] In this embodiment, the horizontal height of the first guide rail 11 is lower than that of the second guide rail 12. In order to keep the first transmission shaft 23 and the second transmission shaft 24 at both ends of the motor 22 coaxial so as to make the power output smoother, a first idler gear 253 is arranged between the first input gear 252 and the first output gear 254 to keep the first input gear 252 and the second input gear 262 coaxial. The number and diameter size of the first idler gear 253 can be correspondingly set according to the height difference between the first guide rail 11 and the second guide rail 12, and only the requirement of keeping the first input gear 252 and the second input gear 262 coaxial and the first gearbox 25 and the second gearbox 26 having the same transmission ratio needs to be met. If the size and number of the first idler gear 253 alone cannot meet the above requirements, the sizes of the first input gear 252, the second input gear 262, the first output gear 254 and the second output gear 263 can also be adjusted together.

[0035] Preferably, both the first transmission shaft 23 and the second transmission shaft 24 are flexible shafts. Flexible shaft transmission has high transmission efficiency and precision, and at the same time can reduce the vibration and noise between devices, which is beneficial to reducing the noise when the seat slides and improving the user experience.

[0036] Preferably, the input interfaces of the first gearbox 25 and the second gearbox 26 are the same, and the output interfaces of the first gearbox 25 and the second gearbox 26 are the same. Such a setting can improve the versatility of the slide rail driving device 100 and can better match the transmission shaft and the lead screw.

[0037] As Figure 1 shown, a first limiting groove (not labeled in the figure) for limiting the motor 22 is provided on the power frame 21, and a first clamping groove (not labeled in the figure) for clamping the first transmission shaft 23 and a second clamping groove (not labeled in the figure) for clamping the second transmission shaft 24 are respectively provided at both ends of the first limiting groove.

[0038] As Figure 3 shown, the first gearbox 25 further includes a first box body 251, and the second gearbox 26 further includes a second box body 261. The first box body 251 and the second box body 261 are respectively connected to both ends of the power frame 21. In this embodiment, the first box body 251 and the second box body 261 are fixedly connected to the power frame 21 through fasteners such as bolts.

[0039] Please refer to Figure 2 together with Figure 3, the first guide rail 11 includes a first lower rail 111 and a first upper rail 112. The first upper rail 112 is slidably connected to the first lower rail 111. The first lead screw 113 is installed on the first lower rail 111. The first output gear 254 is in transmission connection with the first lead screw 113. The first box body 251 is connected to the first upper rail 112. Similarly, the second guide rail 12 includes a second lower rail 121 and a second upper rail 122. The second upper rail 122 is slidably connected to the first lower rail 111. The second lead screw 123 is installed on the second lower rail 121. The second output gear 263 is in transmission connection with the second lead screw 123. The second box body 261 is connected to the second upper rail 122. Such a setting can improve the transmission efficiency and transmission stiffness, making the driving of the seat slide smoother, more efficient and quieter.

[0040] To facilitate the fixing of the gearbox on the guide rail, the driving mechanism 20 further includes a first connecting bracket 27 and a second connecting bracket 28. The first connecting bracket 27 connects the first box body 251 and the first upper rail 112. The second connecting bracket 28 connects the second box body 261 and the second upper rail 122.

[0041] As Figure 1 and Figure 4 shown, the first connecting bracket 27 is provided with a first accommodating cavity 271 for accommodating the first box body 251 and a first connecting piece 272 connected to the first upper rail 112. To better wrap the first box body 251, the shape of the first accommodating cavity 271 is adapted to the outer contour of the first box body 251. Similarly, the second connecting bracket 28 is provided with a second accommodating cavity (not labeled in the figure) for accommodating the second box body 261 and a second connecting piece (not labeled in the figure) connected to the second upper rail 122. By providing the first accommodating cavity 271 for accommodating the first box body 251 on the first connecting bracket 27, the contact area between the first connecting bracket 27 and the first box body 251 can be increased, and the first box body 251 can be restricted in multiple directions, which is beneficial to reducing the vibration of the first gearbox 25 and improving the reliability. Similarly, the structure of the second connecting bracket 28 can reduce the vibration of the second gearbox 26 and improve the reliability. To improve the versatility, the structures of the first connecting piece 272 and the second connecting piece should be the same, which can reduce the cost.

[0042] The slide rail driving device 100 of the present application is configured such that the first gearbox 25 is disposed on the first guide rail 11 at the lower side, and the input gears of the first gearbox 25 and the second gearbox 26 are coaxially arranged. This enables the first transmission shaft 23 and the second transmission shaft 24 to be in smooth coaxial transmission. This can accommodate the situation where there is a height difference between the guide rails on both sides of some vehicle models. Moreover, the height dimension of the first gearbox 25 is designed according to the height difference between the first guide rail 11 and the second guide rail 12 to match different height differences, with good versatility and low noise, which is beneficial to improving the user experience. Additionally, the first gearbox 25 and the second gearbox 26 have the same transmission ratio, which can ensure the synchronization of the transmission of the first lead screw 113 and the second lead screw 123, making the translation of the seat smoother.

[0043] Second Embodiment:

[0044] Please refer to Figure 5 , which shows a slide rail driving device 100 of the second embodiment of the present utility model. The slide rail driving device 100 in this embodiment is similar to the slide rail driving device 100 in the first embodiment. The difference lies in that in this embodiment, a second idler gear 264 is further disposed inside the second gearbox 26, and the second idler gear 264 is disposed between the second input gear 262 and the second output gear 263. That is, in this embodiment, the first guide rail 11 and the second guide rail 12 are at the same horizontal height. However, in order to obtain more space for better arrangement of facilities such as seats inside the vehicle, the power frame 21 and the motor 22 are elevated by also disposing the second idler gear 264 inside the second gearbox 26 to obtain more sufficient space. Similarly, the diameter dimensions and the number of the first idler gear 253 and the second idler gear 264 can also be flexibly set according to the height of the required space, and no specific limitation is made herein.

[0045] In addition, when the height difference between the first guide rail 11 and the second guide rail 12 is relatively large, the first idler gear 253 can be disposed inside the first gearbox 25 and the second idler gear 264 can be disposed inside the second gearbox 26 simultaneously to ensure that both ends of the power frame 21 are kept horizontal.

[0046] Third Embodiment:

[0047] The present application also provides an embodiment of an automotive seat (not shown in the figure) applying the above slide rail driving device 100. The automotive seat includes a seat body (not shown in the figure) and the above slide rail driving device 100, wherein the first upper rail 112 and the second upper rail 122 are fixedly connected to the seat body, and the first lower rail 111 and the second lower rail 121 are fixed on the floor of the vehicle compartment. The automotive seat having the above slide rail driving device 100 also has the advantages of the above slide rail driving device 100, which will not be elaborated herein.

[0048] Finally, it should be noted that the above are only preferred examples of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A slide rail driving device, comprising a track mechanism (10) and a driving mechanism (20), wherein the track mechanism (10) includes a first guide rail (11) and a second guide rail (12) arranged in parallel, a first lead screw (113) is arranged in the first guide rail (11), a second lead screw (123) is arranged in the second guide rail (12), the driving mechanism (20) includes a power frame (21) erected between the first guide rail (11) and the second guide rail (12), a motor (22) installed on the power frame (21), and a first gear box (25) and a second gear box (26) arranged at both ends of the power frame (21), characterized in that, Axially at both ends of the motor (22), a first transmission shaft (23) and a second transmission shaft (24) are coaxially arranged respectively. The first gearbox (25) and the second gearbox (26) have the same transmission ratio. Inside the first gearbox (25), a first input gear (252), a first idler gear (253), and a first output gear (254) are sequentially arranged along the height direction. The first input gear (252) is connected to the first transmission shaft (23), and the first output gear (254) is connected to the first lead screw (113). Inside the second gearbox (26), a second input gear (262) and a second output gear (263) are sequentially arranged along the height direction. The second input gear (262) is connected to the second transmission shaft (24), and the second output gear (263) is connected to the second lead screw (123). The central axes of the first output gear (254) and the second output gear (263) are coaxial or have a height difference.

2. The slide rail driving device according to claim 1, wherein Inside the second gearbox (26), a second idler gear (264) is further arranged, and the second idler gear (264) is arranged between the second input gear (262) and the second output gear (263).

3. The slide rail driving device according to claim 1, wherein Both the first transmission shaft (23) and the second transmission shaft (24) are flexible shafts.

4. The slide rail driving device according to claim 1, wherein The input interfaces of the first gearbox (25) and the second gearbox (26) are the same, and the output interfaces of the first gearbox (25) and the second gearbox (26) are the same.

5. The slide rail driving device according to claim 1, wherein The first gearbox (25) further includes a first housing (251), and the second gearbox (26) further includes a second housing (261). The first housing (251) and the second housing (261) are respectively connected to both ends of the power rack (21).

6. The slide rail driving device according to claim 5, wherein, The first guide rail (11) includes a first lower rail (111) and a first upper rail (112). The first upper rail (112) is slidably connected to the first lower rail (111). The first lead screw (113) is installed on the first lower rail (111). The first output gear (254) is in transmission connection with the first lead screw (113), and the first housing (251) is connected to the first upper rail (112); The second guide rail (12) includes a second lower rail (121) and a second upper rail (122). The second upper rail (122) is slidably connected to the first lower rail (111). The second lead screw (123) is installed on the second lower rail (121). The second output gear (263) is in transmission connection with the second lead screw (123), and the second housing (261) is connected to the second upper rail (122).

7. The slide rail driving device according to claim 6, characterized in that, The drive mechanism (20) further includes a first connection bracket (27) and a second connection bracket (28). The first connection bracket (27) connects the first housing (251) and the first upper rail (112), and the second connection bracket (28) connects the second housing (261) and the second upper rail (122).

8. The slide rail driving device according to claim 7, characterized in that, The first connecting bracket (27) is provided with a first accommodation cavity (271) for accommodating the first box body (251) and a first connecting piece (272) connected to the first upper rail (112). The second connecting bracket (28) is provided with a second accommodation cavity for accommodating the second box body (261) and a second connecting piece connected to the second upper rail (122).

9. An automotive seat, characterized in that, It includes a seat body and the slide rail driving device (100) according to any one of claims 1-8.

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