An automatic slide rail for a vehicle seat

Abstract

An automatic slide rail for an automotive seat, comprising a pair of slide rail assemblies. Each slide rail assembly includes a guide rail and a slide seat. There is a gearbox on the slide seat, and there is a driving device between the two slide seats. The driving device is connected to the gearbox. A screw rod is arranged in the guide rail and passes through the slide seat. Features: Support heads are provided at both ends of the slide seat. The middle part of the support head is connected to one end of the slide seat, and there is a sliding backlash elimination block mounting seat at the lower part. There is a sliding backlash elimination block on the sliding backlash elimination block mounting seat. Upper and lower inclined surfaces are provided on the upper and lower ends of the sliding backlash elimination block. Upper and lower roller grooves are provided on the upper and lower inclined surfaces. Upper and lower rollers are arranged in the upper and lower roller grooves. Lubricating and wear-resistant layers are compounded on the surfaces of the upper and lower rollers. A slideway is formed in the guide rail. The slideway includes slideway side walls and upper and lower slideway walls. The sliding backlash elimination block is arranged in the slideway, and the upper and lower rollers abut against the corners of the slideway side wall and the upper slideway wall and the corners of the slideway side wall and the lower slideway wall and are configured to form a sliding fit. It has good clearance elimination effect, no abnormal noise, high stability and long service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive seat accessories, and particularly relates to an automatic slide rail for an automotive seat. Background Art

[0002] Automotive seats are one of the most important components of a vehicle and are the main factor affecting people's riding comfort. With the development of technology, the development of automotive seats is gradually tending towards automation and comfort, and generally has the functions of automatically sliding back and forth and adjusting the backrest angle. The automatic sliding function is mainly completed by the cooperation of a slide rail assembly and a driving device. The current slide rail structure mainly includes a guide rail and a slide seat slidably disposed in the guide rail. The slide seat is driven to slide on the guide rail through the cooperation of a motor, a screw rod, and a gearbox. Between the slide seat and the guide rail, balls or rollers are usually used to provide support and eliminate gaps. However, the clearance elimination structures in the prior art often cannot take into account the gaps in all directions of up, down, front, and back, and often cause shaking and abnormal noises during the sliding process. In addition, the balls or rollers on the slide seat are likely to cause pits on the guide rail under heavy loads, resulting in bumps and jamming sensations during the sliding process of the slide seat. Moreover, although the balls and rollers are supported and roll on the guide rail, rolling friction still occurs. Due to the relatively large friction coefficient between steel and steel (i.e., between the balls / rollers and the guide rail), after long-term use, the balls / rollers and the guide rail will all have varying degrees of wear, which will also generate gaps and cause shaking and abnormal noises.

[0003] In the prior art, such as the "automatic slide rail device for an automotive seat" provided by the Chinese utility model patent authorization publication number CN214083960U, it mainly uses a structure with rollers supporting the slide seat and installing clearance elimination blocks to eliminate gaps. Although the slide seat can slide smoothly on the guide rail, the friction of the rollers on the guide rail and the pressure of gravity will cause disadvantages such as deformation and pits on the guide rail, and thus there will also be shaking and abnormal noises.

[0004] In view of the above situation, it is necessary to design an automatic slide rail for an automotive seat with a compact structure, without generating shaking and abnormal noises, and capable of avoiding the slide seat from squeezing and rubbing the guide rail to cause deformation of the guide rail. For this reason, the applicant has made a beneficial design, and the technical solution to be introduced below is generated under this background. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic slide rail for an automotive seat, which helps to improve the cooperation structure between the slide seat and the guide rail to eliminate the gap between the two, increase the mutual contact area, and reduce the friction coefficient, which is beneficial to improving the stability of the slide rail structure and reducing the pressure and wear degree of the slide seat on the guide rail, and greatly improves the service life of the slide rail.

[0006] The object of the present invention is achieved in the following way. An automatic slide rail for an automotive seat includes a pair of symmetrically and parallelly arranged slide rail assemblies. Each of the slide rail assemblies includes a guide rail and a slide seat that slides within the guide rail. A gear box is respectively mounted on the slide seats. A driving device is fixed between the two slide seats, and both ends of the driving device are respectively in transmission connection with the gear boxes on both sides. A screw rod is respectively arranged along the length direction within the guide rail. The screw rod passes through the slide seat and is in transmission connection with the corresponding gear box. When the gear box operates, it drives the slide seat to move along the length direction of the screw rod within the guide rail. The feature is that: on the left and right ends of the slide seat in the length direction, a support head is symmetrically arranged respectively. The middle part of the support head is respectively fixedly connected to one end of the slide seat, and the lower part extends along the front-back direction respectively and forms a sliding clearance elimination block mounting seat. A sliding clearance elimination block is respectively fixed on the sliding clearance elimination block mounting seat. An upper inclined surface is formed obliquely upward at the upper end of the sliding clearance elimination block, and a lower inclined surface is formed obliquely downward at the lower end. At least one upper roller groove is opened along the left-right direction on the upper inclined surface, and at least one lower roller groove is opened along the left-right direction on the lower inclined surface. The upper roller groove and the lower roller groove are respectively inclined towards the side away from the corresponding support head. An upper roller is embedded in the upper roller groove, and a lower roller is embedded in the lower roller groove. The upper roller and the lower roller respectively protrude from the upper roller groove and the lower roller groove. The axial line directions of the upper roller and the lower roller are the same as the sliding direction of the slide seat. A lubricating and wear-resistant layer is respectively compounded on the surfaces of the upper roller and the lower roller. On the front and rear sides within the guide rail, a slide way is respectively formed along the length direction. The slide way is composed of a slide way side wall, a slide way upper wall and a slide way lower wall. The sliding clearance elimination blocks are respectively arranged within the slide way on the corresponding side, and the upper roller and the lower roller respectively abut against the corner between the slide way side wall and the slide way upper wall and the corner between the slide way side wall and the slide way lower wall and form a sliding fit.

[0007] In a specific embodiment of the present invention, a pair of sliding clearance elimination block mounting seat screw holes are respectively opened on the sliding clearance elimination block mounting seat. A sliding clearance elimination block fixing hole is respectively opened at the position corresponding to the sliding clearance elimination block mounting seat screw hole on the sliding clearance elimination block. A sliding clearance elimination block fixing screw is respectively arranged within the sliding clearance elimination block fixing hole. The sliding clearance elimination block fixing screws respectively pass through the corresponding sliding clearance elimination block fixing holes and are fixed to the corresponding sliding clearance elimination block mounting seat screw holes, thereby realizing the fixed connection between the sliding clearance elimination block and the sliding clearance elimination block mounting seat. On the side surface of the sliding clearance elimination block facing the support head, a sliding clearance elimination block embedding groove is also formed. The shape and size of the sliding clearance elimination block embedding groove are respectively matched with the shape and size of the outer side surface of the sliding clearance elimination block mounting seat. The outer side surfaces of the sliding clearance elimination block mounting seat are respectively embedded within the corresponding sliding clearance elimination block embedding grooves.

[0008] In another specific embodiment of the present invention, a pair of support head fixing clamping plates are respectively formed at the left and right ends of the sliding seat in the length direction. The pair of support head fixing clamping plates are respectively clamped on the front and rear side surfaces of the middle part of the corresponding support head, and the two are welded and fixed; a sliding seat cavity with an opening downward is further formed in the middle of the sliding seat along the length direction; a gearbox mounting opening communicating with the sliding seat cavity is further opened in the middle of the upper part of the sliding seat in the height direction. A pair of gearbox clamping plates are respectively formed on the front and rear sides of the gearbox mounting opening. A gearbox frame with its lower end extending into the sliding seat cavity is arranged in the gearbox mounting opening. The gearbox is arranged on the gearbox frame and is restricted in the left, right, lower, front and rear directions by the gearbox frame and the gearbox clamping plates. A motor mounting frame is arranged on the gearbox frame and presses against the upper part of the gearbox. The sliding seat, the gearbox frame and the motor mounting frame are fixedly connected by bolts.

[0009] In yet another specific embodiment of the present invention, sliding seat gearbox fixing holes are respectively opened at positions on the upper part of the sliding seat in the height direction and on the left and right sides of the gearbox mounting opening. A pair of gearbox frame fixing ears are respectively folded on the left and right sides of the gearbox frame. Gearbox frame fixing ear holes are respectively opened at positions of the gearbox frame fixing ears corresponding to the sliding seat gearbox fixing holes. A pair of motor mounting frame fixing ears are respectively folded on the left and right sides of the motor mounting frame. Motor mounting frame fixing ear holes are respectively opened at positions of the motor mounting frame fixing ears corresponding to the gearbox frame fixing ear holes. The sliding seat gearbox fixing holes, the gearbox frame fixing ear holes and the motor mounting frame fixing ear holes are fixedly connected by fasteners.

[0010] In still another specific embodiment of the present invention, inner sliding seats are respectively arranged in the sliding seat cavity and at positions on the left and right sides of the gearbox frame. The front and rear side surfaces of the inner sliding seats are respectively welded and fixed to the inner side walls of the sliding seat cavity. The two lower edges of the inner sliding seats respectively extend out of the sliding seat and are turned outward to form an inner sliding seat foot; an inner sliding rail extending in the left and right direction is fixed at the bottom of the guide rail at a position corresponding to the inner sliding seat. A pair of inner sliding rail feet for cooperating with the inner sliding seat feet are respectively bent upward and inward at the two side edges of the inner sliding rail.

[0011] In still another specific embodiment of the present invention, a guide rail opening is formed in the middle of the guide rail along the length direction. The two side edges of the guide rail opening are respectively bent inward and form the slide ways on the front and rear sides respectively. The lower ends of the sliding seat and the support head extend into the guide rail opening and slide in the corresponding slide way through a sliding clearance eliminating block. The upper roller and the lower roller respectively abut against the corners of the slide way side wall and the upper wall of the slide way and the corners of the slide way side wall and the lower wall of the slide way to eliminate the gap between the guide rail and the sliding seat.

[0012] In a further specific embodiment of the present invention, the lubricating and wear-resistant layer is a polytetrafluoroethylene layer.

[0013] In a still further specific embodiment of the present invention, there are two upper roller grooves formed on the upper end surface of the sliding clearance eliminating block, and the two upper roller grooves are arranged at intervals; there are two lower roller grooves formed on the lower end surface of the sliding clearance eliminating block, and the two lower roller grooves are arranged at intervals.

[0014] In yet a further specific embodiment of the present invention, the driving device includes a motor base fixed to the corresponding side sliding seat at both ends, a motor fixed on the motor base, and a motor shaft formed on the motor and extending forward and backward respectively and drivingly connected to the corresponding side gearbox.

[0015] In yet a still further specific embodiment of the present invention, seat mounting holes are respectively formed on the supporting heads, screw passing holes are respectively formed at the positions of the supporting heads corresponding to the screws, and both ends of the screws are fixed in the guide rail through screw seats.

[0016] After the present invention adopts the above structure, the beneficial effects are as follows: Due to the structure of arranging sliding clearance eliminating blocks on the front and rear side surfaces at both ends of the sliding seat to cooperate with the guide rail and adopting the structure that the axis line of the roller is the same as the sliding direction and forms a sliding fit with the guide rail on the front, rear, upper and lower four surfaces, the contact surface between the roller and the guide rail is increased. At the same time, by adding a lubricating and wear-resistant layer on the surface of the roller, the friction coefficient between the sliding seat and the guide rail is reduced, effectively eliminating the clearance, improving the stability, reducing the pressure and wear degree of the sliding seat on the guide rail, and greatly prolonging the service life of the slide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic diagram of an embodiment of the present invention.

[0018] Figure 2 It is a three-dimensional structure schematic diagram of the slide rail assembly of the present invention.

[0019] Figure 3 It is a side structure schematic diagram of the slide rail assembly of the present invention.

[0020] Figure 4 It is a three-dimensional view in one side direction of the sliding clearance eliminating block of the present invention.

[0021] Figure 5 It is a three-dimensional view in the other side direction of the sliding clearance eliminating block of the present invention.

[0022] In the figure: 1. Slide rail assembly, 11. Guide rail, 111. Guide rail opening, 112. Slideway, 1121. Slideway side wall, 1122. Slideway upper wall, 1123. Slideway lower wall, 12. Slide block, 121. Slide block cavity, 122. Support head fixing splint, 123. Gearbox mounting opening, 124. Gearbox splint, 125. Slide block gearbox fixing hole, 13. Support head, 131. Sliding backlash eliminator mounting seat, 1311. Sliding backlash eliminator mounting seat screw hole, 132. Seat mounting hole, 133. Screw rod clearance hole, 14. Sliding backlash eliminator, 141. Upper roller groove, 1411. Upper roller, 142. Lower roller groove, 1421. Lower roller, 143. Sliding backlash eliminator fixing hole, 1431. Sliding backlash eliminator fixing screw, 144. Sliding backlash eliminator slot, 145. Upper inclined surface, 146. Lower inclined surface, 15. Gearbox frame, 151. Gearbox frame fixing ear, 1511. Gearbox frame fixing ear hole, 16. Motor mounting frame, 161. Motor mounting frame fixing ear, 1611. Motor mounting frame fixing ear hole, 17. Inner slide rail, 171. Inner slide rail foot, 18. Inner slide block, 181. Inner slide block foot; 2. Driving device, 21. Motor seat, 22. Motor, 221. Motor shaft; 3. Screw rod, 31. Screw rod seat; 4. Gearbox. Detailed implementation manners

[0023] The following describes in detail the specific implementation manners of the present invention with reference to the accompanying drawings. However, the description of the embodiments does not limit the technical solutions. Any change in form rather than in substance based on the concept of the present invention should be regarded as within the protection scope of the present invention.

[0024] In the following description, any concepts related to directions or orientations such as up, down, left, right, front and back are based on Figure 1 a position, and thus should not be construed as a special limitation on the technical solutions provided by the present invention.

[0025] Please refer to Figures 1 to 5, the present invention relates to an automatic slide rail for an automotive seat, including a pair of symmetrically and parallelly arranged slide rail assemblies 1. The aforementioned slide rail assembly 1 includes a guide rail 11 and a slide block 12 that slides within the guide rail 11. A gearbox 4 is respectively installed on the aforementioned slide block 12. A driving device 2 is fixed between the two aforementioned slide blocks 12, and both ends of the driving device are respectively in transmission connection with the gearboxes 4 on both sides. A screw rod 3 is respectively arranged along the length direction within the aforementioned guide rail 11. The aforementioned screw rod 3 passes through the slide block 12 and is in transmission connection with the corresponding gearbox 4. When the aforementioned gearbox 4 operates, it drives the slide block 12 to move along the length direction of the guide rail 11 on the screw rod 3. Support heads 13 are symmetrically arranged at the left and right ends of the aforementioned slide block 12 in the length direction. The middle parts of the aforementioned support heads 13 are respectively fixedly connected to one end of the slide block 12, and the lower parts respectively extend in the front-rear direction and form a sliding clearance block mounting seat 131. A sliding clearance block 14 is respectively fixed on the aforementioned sliding clearance block mounting seat 131. An upper inclined surface 145 is formed obliquely upward at the upper end of the aforementioned sliding clearance block 14, and a lower inclined surface 146 is formed obliquely downward at the lower end. At least one upper roller groove 141 is opened along the left-right direction on the aforementioned upper inclined surface 145. At least one lower roller groove 142 is opened along the left-right direction on the aforementioned lower inclined surface 146. In this embodiment, there are two upper roller grooves 141 opened on the upper end surface of the aforementioned sliding clearance block 14, and the two aforementioned upper roller grooves 141 are arranged at intervals; there are two lower roller grooves 142 opened on the lower end surface of the aforementioned sliding clearance block 14, and the two aforementioned lower roller grooves 142 are arranged at intervals. The aforementioned upper roller groove 141 and lower roller groove 142 are respectively inclined towards the side away from the corresponding support head 13. An upper roller 1411 is embedded in the aforementioned upper roller groove 141, and a lower roller 1421 is embedded in the aforementioned lower roller groove 142. Moreover, the aforementioned upper roller 1411 and lower roller 1421 respectively protrude from the upper roller groove 141 and lower roller groove 142, and the axial line directions of the aforementioned upper roller 1411 and lower roller 1421 are the same as the sliding direction of the aforementioned slide block 12. A lubricating and wear-resistant layer is respectively compounded on the surfaces of the aforementioned upper roller 1411 and lower roller 1421. The aforementioned lubricating and wear-resistant layer is preferably a polytetrafluoroethylene layer. Slide ways 112 are respectively formed along the length direction on the front and rear sides within the aforementioned guide rail 11. The aforementioned slide way 112 constitutes a slide way side wall 1121, a slide way upper wall 1122, and a slide way lower wall 1123. The aforementioned sliding clearance blocks 14 are respectively arranged within the corresponding slide way 112 on one side, and the upper roller 1411 and lower roller 1421 respectively abut against the corners between the slide way side wall 1121 and the slide way upper wall 1122 and the corners between the slide way side wall 1121 and the slide way lower wall 1123 and are configured to be in sliding fit.The aforementioned support head 13 is also provided with a seat mounting hole 132 , and the aforementioned support head 13 is provided with a screw clearance hole 133 at a position corresponding to the screw 3 . Both ends of the aforementioned screw 3 are fixed in the guide rail 11 through a screw seat 31 .

[0026] Furthermore, a pair of sliding gap eliminating block mounting seat screw holes 1311 are respectively provided on the aforementioned sliding gap eliminating block mounting seat 131, and the aforementioned sliding gap eliminating block 14 is respectively provided with a sliding gap eliminating block fixing hole 143 at the position corresponding to the sliding gap eliminating block mounting seat screw hole 1311, and a sliding gap eliminating block fixing screw 1431 is respectively arranged in the aforementioned sliding gap eliminating block fixing hole 143, and the aforementioned sliding gap eliminating block fixing screw 1431 passes through the corresponding sliding gap eliminating block fixing hole 143 and is fixed to the corresponding sliding gap eliminating block mounting seat screw hole 1311, thereby realizing the fixed connection between the sliding gap eliminating block 14 and the sliding gap eliminating block mounting seat 131, and the aforementioned sliding gap eliminating block 14 is also formed with a sliding gap eliminating block embedding groove 144 on the side surface facing the support head 13, and the shape and size of the aforementioned sliding gap eliminating block embedding groove 144 are respectively matched with the shape and size of the sliding gap eliminating block mounting seat 131, and the outer side surface of the aforementioned sliding gap eliminating block mounting seat 131 is respectively embedded in the corresponding sliding gap eliminating block embedding groove 144.

[0027] Please continue reading Figure 1 The driving device 2 includes a motor base 21 whose two ends are respectively fixed to the corresponding side slide 12, and a motor 22 fixed on the motor base 21. The motor 22 is formed with a motor shaft 221 extending in the forward and rearward directions respectively and connected to the corresponding side gear box 4 respectively.

[0028] Please continue reading Figure 2 Combined with Figure 1, on the left and right ends of the aforementioned sliding seat 12 in the length direction, a pair of support head fixing clamping plates 122 are respectively formed. A pair of the aforementioned support head fixing clamping plates 122 are respectively clamped on the front and rear side surfaces of the middle part of the corresponding side support head 13 and are welded and fixed to each other; in the middle of the aforementioned sliding seat 12 along the length direction, a sliding seat cavity 121 with an opening downward is further formed; in the middle of the aforementioned sliding seat 12 in the height direction, a gearbox mounting opening 123 communicating with the sliding seat cavity 121 is further opened. On the front and rear sides of the aforementioned gearbox mounting opening 123, a gearbox clamping plate 124 is respectively formed. In the aforementioned gearbox mounting opening 123, a gearbox frame 15 with its lower end extending into the sliding seat cavity 121 is arranged. The aforementioned gearbox 4 is arranged on the gearbox frame 15 and is restricted in the left, right, lower, front, and rear directions by the gearbox frame 15 and the gearbox clamping plate 124. On the aforementioned gearbox frame 15, a motor mounting frame 16 is arranged. The aforementioned motor mounting frame 16 is pressed against the upper part of the gearbox 4. The aforementioned sliding seat 12, gearbox frame 15, and motor mounting frame 16 are fixedly connected by bolts. The aforementioned motor mounting frame 16 respectively extends towards the driving device 2 and is fixedly connected to the motor seat 21 of the driving device 2 by bolts.

[0029] Further, on the upper part of the aforementioned sliding seat 12 in the height direction and at positions on the left and right sides of the gearbox mounting opening 123, a sliding seat gearbox fixing hole 125 is respectively opened. On the left and right sides of the aforementioned gearbox frame 15, a gearbox frame fixing ear 151 is respectively folded. At positions corresponding to the sliding seat gearbox fixing holes 125, a gearbox frame fixing ear hole 1511 is respectively opened on the gearbox frame fixing ears 151. On the left and right sides of the aforementioned motor mounting frame 16, a motor mounting frame fixing ear 161 is respectively folded. At positions corresponding to the gearbox frame fixing ear holes 1511, a motor mounting frame fixing ear hole 1611 is respectively opened on the motor mounting frame fixing ears 161. The sliding seat gearbox fixing holes 125, gearbox frame fixing ear holes 1511, and motor mounting frame fixing ear holes 1611 are fixedly connected by fasteners.

[0030] In this embodiment, in the sliding seat cavity 121 of the aforementioned sliding seat 12 and at positions on the left and right sides of the gearbox frame 15, an inner sliding seat 18 is respectively arranged. The front and rear side surfaces of the aforementioned inner sliding seat 18 are respectively welded and fixed to the inner side wall of the sliding seat cavity 121. The two lower edges of the aforementioned inner sliding seat 18 respectively extend out of the sliding seat 12 and are folded outward to form an inner sliding seat foot 181; at positions corresponding to the inner sliding seat 18 on the bottom of the aforementioned guide rail 11, an inner sliding rail 17 extending in the left and right direction is fixed. On both side edges of the aforementioned inner sliding rail 17, a pair of inner sliding rail feet 171 for cooperating with the inner sliding seat feet 181 are respectively bent upward and inward.

[0031] Furthermore, a guide rail opening 111 is formed along the length direction in the middle of the foregoing guide rail 11. The two side edges of the foregoing guide rail opening 111 are bent inward respectively and a slideway 112 is formed on each of the front and rear sides. The lower ends of the foregoing slide block 12 and the support head 13 extend into the guide rail opening 111 and slide in the corresponding slideway 112 on one side through a sliding clearance eliminating block 14. The foregoing upper roller 1411 and lower roller 1421 are respectively abutted against the corner between the slideway side wall 1121 and the slideway upper wall 1122 and the corner between the slideway side wall 1121 and the slideway lower wall 1123, so as to eliminate the gap between the guide rail 11 and the slide block 12.

[0032] Please continue to refer to Figure 1 、 Figure 2 、 Figure 3 and in combination with Figure 4 、 Figure 5 , during the actual use process, the vehicle seat is fixed between the two slide rail assemblies 1 through the foregoing seat mounting holes 132. The foregoing motor 22 drives the gearbox 4 to work through the motor shaft 221. The gear with threads in the foregoing gearbox 4 rotates on the screw rod 3 to achieve movement, so that the gearbox 4 drives the gearbox frame 15, the motor mounting frame 16, the driving device 2, the slide block 12, the support head 13 and the sliding clearance eliminating block 14 to move together along the length direction of the guide rail 11. During the movement, the foregoing upper roller 1411 and lower roller 1421 on the sliding clearance eliminating block 14 are respectively abutted against the corner between the slideway side wall 1121 and the slideway upper wall 1122 and the corner between the slideway side wall 1121 and the slideway lower wall 1123, so that the gap between the guide rail 11 and the slide block 12 can be eliminated on the front, rear, upper and lower four surfaces, making the running stability of the slide rail extremely good, effectively avoiding shaking and abnormal noises. At the same time, the addition of the lubricating and wear-resistant layer on the roller surface greatly improves the service life of the slide rail.

Claims

1. An automatic slide rail for a vehicle seat, comprising a pair of symmetrically and parallelly arranged slide rail assemblies (1). Each of the slide rail assemblies (1) includes a guide rail (11) and a slide seat (12) that slides within the guide rail (11). A gearbox (4) is respectively installed on the slide seats (12). A driving device (2) is fixed between the two slide seats (12), and both ends of the driving device (2) are respectively in transmission connection with the gearboxes (4) on both sides. A screw rod (3) is respectively arranged along the length direction within the guide rail (11). The screw rod (3) passes through the slide seat (12) and is in transmission connection with the corresponding gearbox (4). When the gearbox (4) operates, it drives the slide seat (12) to move along the length direction of the guide rail (11) on the screw rod (3). It is characterized in that: On the left and right ends of the sliding seat (12) in the length direction, a support head (13) is symmetrically arranged respectively. The middle parts of the support heads (13) are fixedly connected to one end of the sliding seat (12) respectively, and the lower parts extend along the front and rear directions respectively to form a sliding clearance block mounting seat (131). A sliding clearance block (14) is fixedly arranged on each of the sliding clearance block mounting seats (131). An upper inclined surface (145) is formed obliquely upward at the upper end of the sliding clearance block (14), and a lower inclined surface (146) is formed obliquely downward at the lower end. At least one upper roller groove (141) is formed in the upper inclined surface (145) along the left and right directions, and at least one lower roller groove (142) is formed in the lower inclined surface (146) along the left and right directions. The upper roller groove (141) and the lower roller groove (142) are inclined toward the side away from the corresponding support head (13). An upper roller (1411) is embedded in the upper roller groove (141), and a lower roller (1421) is embedded in the lower roller groove (142). The upper roller (1411) and the lower roller (1421) protrude from the upper roller groove (141) and the lower roller groove (142) respectively. The axial line directions of the upper roller (1411) and the lower roller (1421) are the same as the sliding direction of the sliding seat (12). A lubricating and wear-resistant layer is compounded on the surfaces of the upper roller (1411) and the lower roller (1421) respectively. On the front and rear sides of the guide rail (11) along the length direction, a slideway (112) is formed respectively. The slideway (112) is composed of a slideway side wall (1121), a slideway upper wall (1122) and a slideway lower wall (1123). The sliding clearance blocks (14) are respectively arranged in the corresponding slideways (112), and the upper roller (1411) and the lower roller (1421) respectively abut against the corners of the slideway side wall (1121) and the slideway upper wall (1122) and the corners of the slideway side wall (1121) and the slideway lower wall (1123) to form a sliding fit.

2. The automatic slide rail of an automotive seat according to claim 1, characterized in that: A pair of sliding clearance elimination block mounting seat screw holes (1311) are respectively formed on the described sliding clearance elimination block mounting seat (131). At positions corresponding to the sliding clearance elimination block mounting seat screw holes (1311) on the sliding clearance elimination block (14), a sliding clearance elimination block fixing hole (143) is respectively formed. A sliding clearance elimination block fixing screw (1431) is respectively arranged in the sliding clearance elimination block fixing hole (143). The sliding clearance elimination block fixing screws (1431) respectively pass through the corresponding sliding clearance elimination block fixing holes (143) and are fixed to the corresponding sliding clearance elimination block mounting seat screw holes (1311), thereby realizing the fixed connection between the sliding clearance elimination block (14) and the sliding clearance elimination block mounting seat (131). On the side surface of the sliding clearance elimination block (14) facing the support head (13), a sliding clearance elimination block embedding groove (144) is further formed. The shape and size of the sliding clearance elimination block embedding groove (144) respectively match the shape and size of the outer side surface of the sliding clearance elimination block mounting seat (131). The outer side surfaces of the sliding clearance elimination block mounting seat (131) are respectively embedded in the corresponding sliding clearance elimination block embedding grooves (144).

3. The automatic slide rail of an automotive seat according to claim 1, wherein: At the left and right ends in the length direction of the described sliding seat (12), a pair of support head fixing clamping plates (122) are respectively formed. The pair of support head fixing clamping plates (122) respectively clamp the front and rear side surfaces in the middle of the corresponding side support head (13) and are welded and fixed; In the middle of the sliding seat (12) along the length direction, a sliding seat cavity (121) with an opening downward is further formed; In the middle of the sliding seat (12) in the height direction, a gearbox mounting opening (123) communicating with the sliding seat cavity (121) is further formed. On the front and rear sides of the gearbox mounting opening (123), a gearbox clamping plate (124) is respectively formed. A gearbox frame (15) with its lower end extending into the sliding seat cavity (121) is arranged in the gearbox mounting opening (123). The gearbox (4) is arranged on the gearbox frame (15) and is restricted in the left, right, lower, front, and rear directions by the gearbox frame (15) and the gearbox clamping plate (124). An electric motor mounting frame (16) is arranged on the gearbox frame (15). The electric motor mounting frame (16) presses against the upper part of the gearbox (4). The sliding seat (12), the gearbox frame (15), and the electric motor mounting frame (16) are fixedly connected by bolts.

4. The automatic slide rail of an automotive seat according to claim 3, wherein: The described sliding seat (12) is respectively provided with a sliding seat gearbox fixing hole (125) at positions above the gearbox mounting opening (123) in the height direction and on the left and right sides thereof. On the left and right sides of the gearbox frame (15), there are respectively folded a gearbox frame fixing ear (151). At positions corresponding to the sliding seat gearbox fixing holes (125), the gearbox frame fixing ears (151) are respectively provided with a gearbox frame fixing ear hole (1511). On the left and right sides of the motor mounting frame (16), there are respectively folded a motor mounting frame fixing ear (161). At positions corresponding to the gearbox frame fixing ear holes (1511), the motor mounting frame fixing ears (161) are respectively provided with a motor mounting frame fixing ear hole (1611). The sliding seat gearbox fixing holes (125), the gearbox frame fixing ear holes (1511), and the motor mounting frame fixing ear holes (1611) are fixedly connected by fasteners.

5. The automatic slide rail of an automotive seat according to claim 3, characterized in that: The described sliding seat (12) is respectively provided with an inner sliding seat (18) inside the sliding seat cavity (121) and on the left and right sides of the gearbox frame (15). The front and rear side surfaces of the inner sliding seat (18) are respectively welded and fixed to the inner side walls of the sliding seat cavity (121). The two lower edges of the inner sliding seat (18) respectively extend out of the sliding seat (12) and are folded outward to form an inner sliding seat foot (181). At positions corresponding to the inner sliding seat (18) at the bottom inside the guide rail (11), there is fixed an inner slide rail (17) extending in the left-right direction. The two side edges of the inner slide rail (17) are respectively bent upward and inward to form a pair of inner slide rail feet (171) for cooperating with the inner sliding seat feet (181).

6. The automatic slide rail of an automotive seat according to claim 1, wherein: In the middle of the described guide rail (11) along the length direction, there is formed a guide rail opening (111). The two side edges of the guide rail opening (111) are respectively bent inward and form the described slide ways (112) on the front and rear sides. The lower ends of the sliding seat (12) and the support head (13) extend into the guide rail opening (111) and slide in the corresponding slide way (112) through a sliding clearance eliminating block (14). The upper roller (1411) and the lower roller (1421) respectively abut against the corners of the slide way side wall (1121) and the slide way upper wall (1122) and the corners of the slide way side wall (1121) and the slide way lower wall (1123) to eliminate the clearance between the guide rail (11) and the sliding seat (12).

7. The automatic slide rail of an automotive seat according to claim 1, wherein: The described lubricating and wear-resistant layer is a polytetrafluoroethylene layer.

8. The automatic slide rail of an automotive seat according to claim 1, wherein: There are two upper roller grooves (141) formed on the upper end surface of the described sliding clearance eliminating block (14), and the two upper roller grooves (141) are arranged at intervals. There are two lower roller grooves (142) formed on the lower end surface of the described sliding clearance eliminating block (14), and the two lower roller grooves (142) are arranged at intervals.

9. The automatic slide rail of an automotive seat according to claim 1, wherein: The described driving device (2) includes a motor base (21) with both ends respectively fixed to the corresponding side sliding seat (12), and a motor (22) fixed on the motor base (21). A motor shaft (221) is formed on the motor (22), extending forward and backward respectively and drivingly connected to the corresponding side gearbox (4).

10. The automatic slide rail of an automotive seat according to claim 1, wherein: Seat mounting holes (132) are respectively formed on the support head (13). Screw relief holes (133) are respectively formed on the support head (13) corresponding to the positions of the screws (3). Both ends of the screws (3) are fixed in the guide rail (11) through screw seats (31).

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