Anti-backlash mechanism, automobile seat sliding rail with anti-backlash mechanism and automobile seat with anti-backlash mechanism

Abstract

The invention discloses an anti-backlash mechanism, an automobile seat sliding rail provided with the anti-backlash mechanism and an automobile seat provided with the automobile seat sliding rail, and belongs to the technical field of automobile parts. Comprising an upper sliding rail matching frame; and the upper and lower sliding rail front lateral clearance compensation device and the upper and lower sliding rail rear lateral clearance compensation device are arranged on the upper sliding rail matching frame in a state of corresponding to each other in the front-back direction. The sliding rail has the advantages that the strength can be improved, the structure can be simplified, the excellent integration degree of parts can be reflected, the lasting use stability, the operation comfort and the reliability of the anti-backlash effect can be guaranteed, the sliding resistance of the sliding rail can be reduced when the sliding rail is adjusted, and the problem that the sliding rail is blocked in the adjusting process is solved; the provided automobile seat slide rail can extremely play an excellent role in eliminating a gap between the upper slide rail and the lower slide rail; the provided automobile seat can embody the advantages of an automobile seat slide rail provided with an anti-backlash mechanism.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive parts, and particularly relates to a backlash elimination mechanism, and also relates to an automotive seat slide rail and an automotive seat equipped with the backlash elimination mechanism. Background Art

[0002] The aforementioned backlash elimination mechanism is applied to an automotive seat slide rail. Generally speaking, it can eliminate the gap between the upper and lower slide rails (which can also be called "inner and outer slide rails" or "moving and static slide rails"), ensuring the stability and safety when the seat moves. Since the automotive seat slide rail allows the automotive seat to move back and forth. If there is a gap, abnormal noises or vibrations will occur during vehicle driving, affecting the riding comfort. The function of the backlash elimination mechanism is to reduce and / or eliminate the aforementioned adverse factors.

[0003] The structural forms of the aforementioned backlash elimination mechanism of the automotive seat slide rail mainly but not limited to include: roller type, cylindrical roller type, elastic pressing type, linkage tensioning type, inclined plane self-locking type, and so on.

[0004] Technical information related to the backlash elimination mechanism can be found in the published Chinese patent documents. For example, CN215042255U recommends "Backlash elimination structure of automotive seat slide rail and its elastic member", which pivots one end of a bracket generally in the shape of an H with a 90° offset on the upper slide rail, and an elastically deformable elastic member and a bearing pivoted on the bracket are provided at the other end of the bracket. The elastic member abuts against the corresponding end of the bracket to lift the bracket upward and the bearing abuts against the top of the lower slide rail, thereby eliminating the gap between the upper and lower slide rails (see paragraphs 0039 to 0041 of the specification of this patent). Another example is CN213799340U which introduces "An automotive seat slide rail elimination mechanism". By reading paragraphs 0022 to 0023 of the specification of this patent, it can be known that it plays a backlash elimination role by adjusting the extrusion fit gap between the outer side of the clearance elimination block and the inner side wall of the lower slide rail. Still another example is CN220842279U which provides "A cylindrical roller backlash elimination mechanism for automotive seat slide rail". In this patent, elastic rollers are directly arranged on both sides of the two ends of the upper slide rail (the patent calls it the slide rail bracket), that is, mounting seat insertion grooves are formed on the front and rear sides of the left and right ends of the upper slide rail, and roller mounting seats are arranged in the mounting seat insertion grooves. The roller mounting seats together with the elastic rollers embedded thereon are embedded into the mounting seat insertion grooves, thereby achieving the purpose of eliminating the gap between the upper and lower slide rails. Furthermore, CN221213598U discloses "An automotive seat backlash elimination mechanism", and its specific structure is described in paragraphs 0024 to 0030 of its specification.

[0005] The backlash elimination mechanisms in the prior art, including the patents mentioned above, generally have the common drawbacks of complex structure, low strength, and lack of stability. A complex structure will cause problems such as an increase in the number of components, an increase in volume, a high failure probability, and a large manufacturing cost. Low strength will affect the long-term stability of the backlash elimination effect. For example, deformation or even complete damage may occur, resulting in the reappearance of gaps, causing the seat to shake, and leading to technical problems such as rail jamming or adjustment failure. Therefore, it is of positive significance to explore and design a backlash elimination mechanism with high strength, simple structure, and the ability to avoid problems such as loss of stability, poor operating comfort, low backlash elimination function resulting in abnormal noises, large sliding resistance of the rail, and rail adjustment jamming during use. Summary of the Invention

[0006] The object of the present invention is to provide a backlash elimination mechanism that helps to enhance strength, significantly simplifies the structure, and demonstrates excellent integration of components, thereby ensuring the stability of long-term use, the comfort of operation, the reliability of the backlash elimination effect, and is beneficial to reducing the sliding resistance of the rail in the use state and avoiding problems such as rail jamming during adjustment.

[0007] Another object of the present invention is to provide an automotive seat rail equipped with a backlash elimination mechanism, which can fully achieve the above-mentioned technical effects of the backlash elimination mechanism.

[0008] Still another object of the present invention is to provide an automotive seat that can embody the advantages of the above-mentioned automotive seat rail equipped with a backlash elimination mechanism.

[0009] The object of the present invention is achieved in the following way. A backlash elimination mechanism includes an upper rail fitting frame; a front lateral clearance compensation device for the upper and lower rails and a rear lateral clearance compensation device for the upper and lower rails. The front lateral clearance compensation device for the upper and lower rails and the rear lateral clearance compensation device for the upper and lower rails are arranged on the upper rail fitting frame in a front-back corresponding state.

[0010] In a specific embodiment of the present invention, the upper slide rail fitting frame includes a fitting frame bottom plate, a fitting frame front folding plate, and a fitting frame rear folding plate. The fitting frame front folding plate is formed by folding upwards from the front side in the length direction of the fitting frame bottom plate, and a positioning cavity for the upper and lower slide rail front lateral clearance compensation device is formed at the central position in the upper part of the length direction of the fitting frame front folding plate. The fitting frame rear folding plate is formed by folding upwards from the rear side in the length direction of the fitting frame bottom plate, and a positioning cavity for the upper and lower slide rail rear lateral clearance compensation device is formed at the central position in the upper part of the length direction of the fitting frame rear folding plate. The positioning cavities for the upper and lower slide rail front and rear lateral clearance compensation devices correspond to each other front and rear and are each formed with an open upper part; the upper and lower slide rail front lateral clearance compensation device is positioned on the fitting frame front folding plate at a position corresponding to the positioning cavity for the upper and lower slide rail front lateral clearance compensation device, and the upper and lower slide rail rear lateral clearance compensation device is positioned on the fitting frame rear folding plate at a position corresponding to the positioning cavity for the upper and lower slide rail rear lateral clearance compensation device.

[0011] In another specific embodiment of the present invention, the upper and lower slide rail front lateral clearance compensation device includes a front folding plate insert, a front roller support frame, and a front roller. The front folding plate insert is fitted with the fitting frame front folding plate at a position corresponding to the positioning cavity for the upper and lower slide rail front lateral clearance compensation device. The front roller support frame is inserted and fitted with the front folding plate insert. The front roller is arranged in a lying state on the front roller support frame, and the left end face and the right end face of the front roller are fitted with the front folding plate insert; the upper and lower slide rail rear lateral clearance compensation device includes a rear folding plate insert, a rear roller support frame, and a rear roller. The rear folding plate insert is fitted with the fitting frame rear folding plate at a position corresponding to the positioning cavity for the upper and lower slide rail rear lateral clearance compensation device. The rear roller support frame is inserted and fitted with the rear folding plate insert. The rear roller is arranged in a lying state on the rear roller support frame, and the left end face and the right end face of the rear roller are fitted with the rear folding plate insert.

[0012] In still another specific embodiment of the present invention, the front folding plate insert includes an upper and lower slide rail front lateral clearance compensation plate, a left front fitting foot, and a right front fitting foot. The upper and lower slide rail front lateral clearance compensation plate is arched and the arching direction of the arch faces forward. The front side of the left front fitting foot is integrally formed with the left end of the upper and lower slide rail front lateral clearance compensation plate, and the left front fitting foot is formed with a left front fitting foot figure-eight fitting cavity. The front side of the right front fitting foot is integrally formed with the right end of the upper and lower slide rail front lateral clearance compensation plate, and the right front fitting foot is formed with a right front fitting foot figure-eight fitting cavity. Among them, the left and right front fitting feet are connected by a pair of front fitting foot connecting plates that are both parallel to each other front and rear and have a front clearance with a thickness equal to that of the fitting frame front folding plate between them. The left and right front fitting feet The width of the zigzag-shaped cavity is adapted to the thickness of the front folding plate of the mating frame, and the left and right front fitting feet The zigzag-shaped cavity is fitted with the front side plate of the mating frame at positions corresponding to the left end and the right end of the positioning cavity of the front lateral clearance compensation device of the upper and lower slide rails respectively, and the front clearance is inserted and fitted with the front folding plate of the mating frame corresponding to the bottom of the positioning cavity of the front lateral clearance compensation device of the upper and lower slide rails; the front roller support frame includes a front insertion plate and a front roller bed, the front insertion plate is inserted between the front lateral clearance compensation plate of the upper and lower slide rails and the facing sides of the left front fitting foot and the right front fitting foot, the front roller bed forms an integral structure with the rear side in the length direction of the front insertion plate, the front roller is arranged in a lying state on the front roller bed, the left end face of the front roller is in contact with the end face of the left front fitting foot facing the right front fitting foot, and the right end face of the front roller is in contact with the end face of the right front fitting foot facing the left front fitting foot. The rear folding plate insert includes a rear lateral clearance compensation plate for the upper and lower slide rails, a left rear fitting foot and a right rear fitting foot. The rear lateral clearance compensation plate for the upper and lower slide rails is arched and the arching direction is backward. The rear side of the left rear fitting foot forms an integral structure with the left end of the rear lateral clearance compensation plate for the upper and lower slide rails, and the left rear fitting foot forms a zigzag-shaped cavity, the rear side of the right rear fitting foot forms an integral structure with the right end of the rear lateral clearance compensation plate for the upper and lower slide rails, and the right rear fitting foot forms a zigzag-shaped cavity. Among them, the left and right rear fitting feet are connected by a pair of rear fitting foot connecting plates that are parallel to each other and have a rear clearance that is equal to the thickness of the rear folding plate of the mating frame. The left and right rear fitting feet The width of the zigzag-shaped cavity is adapted to the thickness of the rear folding plate of the mating frame, and the left and right rear fitting feet The zigzag-shaped cavity is fitted with the rear side plate of the mating frame at positions corresponding to the left end and the right end of the positioning cavity of the rear lateral clearance compensation device of the upper and lower slide rails respectively, and the rear clearance is inserted and fitted with the rear folding plate of the mating frame corresponding to the bottom of the positioning cavity of the rear lateral clearance compensation device of the upper and lower slide rails; the rear roller support frame includes a rear insertion plate and a rear roller bed, the rear insertion plate is inserted between the rear lateral clearance compensation plate of the upper and lower slide rails and the facing sides of the left rear fitting foot and the right rear fitting foot, the rear roller bed forms an integral structure with the rear side in the length direction of the rear insertion plate, the rear roller is arranged in a lying state on the rear roller bed, the left end face of the rear roller is in contact with the end face of the left rear fitting foot facing the right rear fitting foot, and the right end face of the rear roller is in contact with the end face of the right rear fitting foot facing the left rear fitting foot,

[0013] In yet another specific embodiment of the present invention, a downwardly concave front roller bed semi-circular arc cavity is formed on one side of the front roller bed in the length direction facing upward, and a downwardly concave rear roller bed semi-circular arc cavity is formed on one side of the rear roller bed in the length direction facing upward.

[0014] In still another specific embodiment of the present invention, the front roller and the rear roller are elastic rollers; the elastic rollers are high-carbon chromium bearing steel rollers, high-strength nylon rollers, ethylene plastic rollers or elastic metal composite rollers; the elastic metal composite materials are aluminum-based composite materials, nickel-based composite materials, titanium-based composite materials, particle-reinforced composite materials or laminated composite materials.

[0015] Another task of the present invention is accomplished as follows. An automobile seat slide rail includes a lower slide rail which is fixed to the vehicle floor in the use state. The front side wall and the rear side wall of the lower slide rail are parallel to each other in the length direction, and the space between the front and rear side walls of the lower slide rail forms a lower slide rail cavity. The upper part of the lower slide rail cavity in the length direction is formed as an opening of the lower slide rail. In the upper part of the front and rear side walls of the lower slide rail in the length direction, a pair of inner folding edges of the lower slide rail parallel to the front and rear side walls of the lower slide rail are folded towards the lower slide rail cavity respectively. In the middle area of the length direction of this pair of inner folding edges of the lower slide rail, a lock tooth plate lock tooth and a lock tooth plate lock tooth groove are formed. The lock tooth plate lock tooth and the lock tooth plate lock tooth groove are in a one-by-one position relationship with each other. The space between the inner folding edge of the lower slide rail and the front side wall and the inner side wall of the lower slide rail forms an upper slide rail outer folding edge matching cavity respectively; an upper slide rail, in the lower part of the front and rear side walls of the upper slide rail in the length direction, a pair of outer folding edges of the upper slide rail parallel to the front and rear side walls of the upper slide rail are folded towards the front and rear side walls of the upper slide rail respectively. This pair of outer folding edges of the upper slide rail is located in the upper slide rail outer folding edge matching cavity described above. The upper part of the upper slide rail in the length direction extends out of the opening of the lower slide rail, and a seat basin connecting nut seat for fixing the seat basin of the automobile seat is fixed at each of the left and right ends of the upper part of the upper slide rail in the use state. At the left end of a pair of outer folding edges of the upper slide rail and at the corresponding positions in the front and rear, a left roller of the outer folding edge of the upper slide rail is provided respectively, and at the right end of a pair of outer folding edges of the upper slide rail and also at the corresponding positions in the front and rear, a right roller of the outer folding edge of the upper slide rail is provided respectively. The left and right rollers of the outer folding edge of the upper slide rail and the bottom plate of the lower slide rail cavity form a rolling pair. In the middle area of the length direction of a pair of outer folding edges of the upper slide rail, a lock tooth plate locking tooth and a lock tooth plate locking tooth groove are formed respectively. The lock tooth plate locking tooth and the lock tooth plate locking tooth groove are in a one-by-one position relationship with each other; an upper and lower slide rail locking and unlocking mechanism is arranged in the middle of the upper slide rail described above and is matched or disengaged with the lock tooth plate lock tooth groove and the lock tooth plate locking tooth groove. When it is simultaneously matched with the lock tooth plate lock tooth groove and the lock tooth plate locking tooth groove, the upper slide rail is in a locked state with the lower slide rail, and when the upper and lower slide rail locking and unlocking mechanism is disengaged from the lock tooth plate lock tooth groove, the upper slide rail is in an unlocked state with the lower slide rail. It is characterized in that a clearance eliminating mechanism as claimed in the claims is provided at the lower part of the left end and the lower part of the right end of the upper slide rail respectively. The clearance between the cavity wall of the upper slide rail outer folding edge matching cavity and the outer folding edge of the upper slide rail formed in the upper slide rail outer folding edge matching cavity is compensated by this clearance eliminating mechanism.

[0016] In a more specific embodiment of the present invention, a dust-proof cover for preventing dust and impurities from entering the cavity of the lower slide rail is fixed at each of the left end and the right end of the lower slide rail. A lower slide rail bracket is fixedly spaced along the length direction of the lower slide rail. At least a pair of spaced lower slide rail carriage floor fixing plates are riveted to the bottom of the lower slide rail. Fixing bolt holes of the lower slide rail carriage floor fixing bracket are formed at the front and rear sides of the middle part of the lower slide rail carriage floor fixing bracket. An upper slide rail movement limit position stop pin passing through the cavity of the lower slide rail is arranged at a position on the left end of the lower slide rail and to the right of the dust-proof cover at the left end, and at a position on the right end of the lower slide rail and to the left of the dust-proof cover at the right end. The front end and the rear end of the upper slide rail movement limit position stop pin are each defined by a circlip. A roller mating cavity is formed at each of the left end and the right end of a pair of outer folded edges of the upper slide rail. The mating frame bottom plate of the upper slide rail mating frame of the backlash elimination mechanism is fixedly welded to the bottom of the upper slide rail. The front roller mates with the roller mating cavities at the left end and the right end of the front one of the pair of outer folded edges of the upper slide rail, and the rear roller mates with the roller mating cavities at the left end and the right end of the rear one of the pair of outer folded edges of the upper slide rail.

[0017] In a further specific embodiment of the present invention, on the top wall of the upper slide rail and at a position corresponding to the upper and lower slide rail locking and unlocking mechanism, there is provided a driving column relief hole communicating with the upper slide rail cavity of the upper slide rail, and a left hanging foot of the return spring is formed corresponding to the left side of the driving column relief hole, and a right hanging foot of the return spring is formed corresponding to the right side of the driving column relief hole; the upper and lower slide rail locking and unlocking mechanism includes a lock tooth plate, a lock tooth plate lifting driving column, a lock tooth plate lifting guide seat, a left return spring of the lock tooth plate and a right return spring of the lock tooth plate. On the front side and the rear side in the length direction of the lock tooth plate, there are respectively formed lock tooth plate locking and unlocking teeth and lock tooth matching grooves. The lock tooth plate locking and unlocking teeth and the lock tooth matching grooves are arranged alternately, and the lock tooth plate locking and unlocking teeth cooperate or disengage with the lock tooth plate lock tooth groove and the lock tooth plate locking tooth groove. When the lock tooth plate locking and unlocking teeth cooperate with the lock tooth plate lock tooth groove and the lock tooth plate locking tooth groove at the same time, the upper slide rail is in a locked state with the lower slide rail, and when the lock tooth plate locking and unlocking teeth disengage from the lock tooth plate lock tooth groove, the upper slide rail is in an unlocked state with the lower slide rail. On the upper side of the middle part of the lock tooth plate, a pair of lock tooth plate lifting guide columns are fixedly arranged at intervals in a longitudinally parallel state. The pair of lock tooth plate lifting guide columns form a sliding pair with the lifting guide column holes provided at both ends of the lock tooth plate lifting guide seat. The lower end of the lock tooth plate lifting driving column is fixed to the upper side of the middle part of the lock tooth plate, and the upper end of the lock tooth plate lifting driving column sequentially passes through the lock tooth plate lifting guide seat and the driving column relief hole from bottom to top and extends above the upper slide rail for the driving handle to cooperate with it. At the upper parts of both ends of the lock tooth plate lifting guide seat, there is respectively provided a lock tooth plate lifting guide seat fixing screw hole. The lock tooth plate lifting guide seat is fixed to the top of the upper slide rail in the upper slide rail cavity by the lock tooth plate lifting guide seat fixing screw at a position corresponding to the lock tooth plate lifting guide seat fixing screw hole. The upper end of the left return spring of the lock tooth plate is hung on the left hanging foot of the return spring, and the lower end is fixed to the left end of the lock tooth plate. The upper end of the right return spring of the lock tooth plate is hung on the right hanging foot of the return spring, and the lower end is fixed to the right end of the lock tooth plate.

[0018] Another task of the present invention is completed as follows. An automobile seat has the automobile seat slide rail as described above.

[0019] The technical solution provided by the present invention has the following technical effects: Since the backlash elimination mechanism is composed of an upper slide rail fitting frame and upper and lower slide rail front and rear lateral clearance compensation devices with the same structure arranged on the upper slide rail fitting frame, it helps to significantly enhance the strength, significantly simplify the structure, and reflect the excellent integration of components, thereby ensuring the stability of long-term use, the comfort of operation, and the reliability of the backlash elimination effect. Moreover, it is beneficial to reduce the sliding resistance of the slide rail during the adjustment of the slide rail in the use state and avoid problems such as jamming of the slide rail during the adjustment process; the provided automotive seat slide rail can extremely play an excellent role in eliminating the gap between the upper and lower slide rails, comprehensively reflecting the above technical effects of the backlash elimination mechanism; the provided automotive seat can reflect the advantages of the automotive seat slide rail equipped with the backlash elimination mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of an embodiment of the backlash elimination mechanism of the present invention;

[0021] Figure 2 is equipped with Figure 1 a structural diagram of an embodiment of an automotive seat slide rail with the shown backlash elimination mechanism;

[0022] Figure 3 is Figure 2 a schematic diagram after the upper and lower slide rails are assembled. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to more clearly understand the technical essence and beneficial effects of the present invention, the applicant will make a detailed description below in the form of embodiments. However, the description of the embodiments is not a limitation to the technical solution of the present invention. Any equivalent transformation that is merely formal rather than substantial based on the concept of the present invention should be regarded as falling within the scope of the technical solution 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 or Figure 2 the position state shown, and thus cannot be understood as a special limitation to the technical solution provided by the present invention.

[0025] Please refer to Figure 1 , which shows an upper slide rail fitting frame 1; shows an upper and lower slide rail front lateral clearance compensation device 2 and an upper and lower slide rail rear lateral clearance compensation device 3, and the upper and lower slide rail front lateral clearance compensation device 2 and the upper and lower slide rail rear lateral clearance compensation device 3 are arranged on the aforementioned upper slide rail fitting frame 1 in a state corresponding to each other front and back.

[0026] The above-mentioned upper slide rail fitting bracket 1 includes a fitting bracket bottom plate 11, a fitting bracket front folding plate 12 and a fitting bracket rear folding plate 13. The fitting bracket front folding plate 12 is formed by folding upward from the front side in the length direction of the fitting bracket bottom plate 11, and a positioning cavity 121 for the front lateral clearance compensation device of the upper and lower slide rails is formed at the central position in the upper part in the length direction of the fitting bracket front folding plate 12. The fitting bracket rear folding plate 13 is formed by folding upward from the rear side in the length direction of the fitting bracket bottom plate 11, and a positioning cavity 131 for the rear lateral clearance compensation device of the upper and lower slide rails is formed at the central position in the upper part in the length direction of the fitting bracket rear folding plate 13. The positioning cavities 121 and 131 for the front and rear lateral clearance compensation devices of the upper and lower slide rails correspond to each other front and rear and are each formed with an open upper part. The above-mentioned front lateral clearance compensation device 2 of the upper and lower slide rails is positioned on the fitting bracket front folding plate 12 at a position corresponding to the positioning cavity 121 for the front lateral clearance compensation device of the upper and lower slide rails, and the above-mentioned rear lateral clearance compensation device 3 of the upper and lower slide rails is positioned on the fitting bracket rear folding plate 13 at a position corresponding to the positioning cavity 131 for the rear lateral clearance compensation device of the upper and lower slide rails.

[0027] As can be seen from Figure 1 shown, the cross-sectional shape of the above-mentioned upper slide rail fitting bracket 1 is in the shape of a certain shape, and the shapes of the positioning cavities 121 and 131 for the front and rear lateral clearance compensation devices of the upper and lower slide rails are in the shape of a certain shape.

[0028] Please continue to see Figure 1 As mentioned above, the front lateral clearance compensation device 2 of the upper and lower slide rails includes a front folding plate embedding part 21, a front roller support frame 22 and a front roller 23. The front folding plate embedding part 21 is fitted with the fitting bracket front folding plate 12 at a position corresponding to the positioning cavity 121 for the front lateral clearance compensation device of the upper and lower slide rails. The front roller support frame 22 is inserted and fitted with the front folding plate embedding part 21. The front roller 23 is arranged in a lying state on the front roller support frame 22, and the left end face and the right end face of the front roller 23 are fitted with the above-mentioned front folding plate embedding part 21. The above-mentioned rear lateral clearance compensation device 3 of the upper and lower slide rails includes a rear folding plate embedding part 31, a rear roller support frame 32 and a rear roller 33. The rear folding plate embedding part 31 is fitted with the fitting bracket rear folding plate 13 at a position corresponding to the positioning cavity 131 for the rear lateral clearance compensation device of the upper and lower slide rails. The rear roller support frame 32 is inserted and fitted with the rear folding plate embedding part 31. The rear roller 33 is arranged in a lying state on the rear roller support frame 32, and the left end face and the right end face of the rear roller 33 are fitted with the above-mentioned rear folding plate embedding part 31.

[0029] The aforementioned front folding plate embedding member 21 includes an upper and lower slide rail front lateral clearance compensation plate 211, a left front fitting foot 212, and a right front fitting foot 213. The upper and lower slide rail front lateral clearance compensation plate 211 is arched and the arching direction of the arch faces forward. The front side surface of the left front fitting foot 212 is integrally structured with the left end of the upper and lower slide rail front lateral clearance compensation plate 211, and the left front fitting foot 212 forms a left front fitting foot zigzag fitting cavity 2121. The front side surface of the right front fitting foot 213 is integrally structured with the right end of the upper and lower slide rail front lateral clearance compensation plate 211, and the right front fitting foot 213 forms a right front fitting foot zigzag fitting cavity 2131. Among them, the left and right front fitting feet 212 and 213 are connected by a front fitting foot connecting plate 214 with a front clearance 2141 that is both parallel to each other front to back and maintains the thickness of the front folding plate 12 of the fitting frame between them. The left and right front fitting feet zigzag fitting cavities 2121 and 2131 are adapted to the thickness of the front folding plate 12 of the fitting frame, and the left and right front fitting feet zigzag fitting cavities 2121 and 2131 are fitted with the front side plate 12 of the fitting frame at positions corresponding to the left end and the right end of the aforementioned upper and lower slide rail front lateral clearance compensation device positioning cavity 121 respectively, and the aforementioned front clearance 2141 is inserted and fitted with the front folding plate 12 corresponding to the bottom of the upper and lower slide rail front lateral clearance compensation device positioning cavity 121; the aforementioned front roller support frame 22 includes a front insertion plate 221 and a front roller bed 222. The front insertion plate 221 is inserted between the opposite sides of the aforementioned upper and lower slide rail front lateral clearance compensation plate 211, the left front fitting foot 212, and the right front fitting foot 213. The front roller bed 222 is integrally structured with the rear side in the length direction of the front insertion plate 221. The aforementioned front roller 23 is arranged in a lying state on the front roller bed 222. The left end face of the front roller 23 is in contact with the end face of the left front fitting foot 212 facing the right front fitting foot 213, and the right end face of the front roller 23 is in contact with the end face of the right front fitting foot 213 facing the left front fitting foot 212.

[0030] The aforementioned rear folding plate embedding member 31 includes an upper and lower slide rail rear lateral clearance compensation plate 311, a left rear fitting foot 312, and a right rear fitting foot 313. The upper and lower slide rail rear lateral clearance compensation plate 311 is arched and the arching direction of the arch faces backward. The rear side surface of the left rear fitting foot 312 is integrally structured with the left end of the upper and lower slide rail rear lateral clearance compensation plate 311, and the left rear fitting foot 312 forms a left rear fitting foot zigzag fitting cavity 3121. The rear side surface of the right rear fitting foot 313 is integrally structured with the right end of the upper and lower slide rail rear lateral clearance compensation plate 311, and the right rear fitting foot 313 forms a right rear fitting foot The Z-shaped cavity 3131, wherein the left and right rear fitting feet 312 and 313 are connected by a rear fitting foot connecting plate 314 having a rear gap 3141 between a pair of the rear fitting feet that are parallel to each other and maintain the thickness of the fitting frame rear folding plate 13, and the left and right rear fitting feet The widths of the Z-shaped cavities 3121 and 3131 are adapted to the thickness of the fitting frame rear folding plate 13, and the left and right rear fitting feet The Z-shaped cavities 3121 and 3131 are fitted with the aforementioned fitting frame rear side plate 13 at positions corresponding to the left end and the right end of the upper and lower slide rail rear side clearance compensation device positioning cavity 131 respectively, and the aforementioned rear gap 3141 is inserted and fitted with the fitting frame rear folding plate 13 corresponding to the bottom of the upper and lower slide rail rear side clearance compensation device positioning cavity 131; the aforementioned rear roller support 32 includes a rear insertion plate 321 and a rear roller bed 322. The rear insertion plate 321 is inserted between the aforementioned upper and lower slide rail rear side clearance compensation plate 311 and the facing sides of the aforementioned left rear fitting foot 312 and the right rear fitting foot 313. The rear roller bed 322 is integrally formed with the rear side in the length direction of the rear insertion plate 321. The aforementioned rear roller 33 is disposed on the rear roller bed 322 in a lying state. The left end face of the rear roller 33 is in contact with the end face of the aforementioned left rear fitting foot 312 facing the right rear fitting foot 313, and the right end face of the rear roller 33 is in contact with the end face of the right rear fitting foot 313 facing the left rear fitting foot 312.

[0031] Preferably, on the upward side in the length direction of the aforementioned front roller bed 222, a downwardly concave front roller bed semi-circular arc cavity 2221 is formed to facilitate the stable lying of the front roller 23. On the upward side in the length direction of the aforementioned rear roller bed 322, a downwardly concave rear roller bed semi-circular arc cavity 3221 is formed to facilitate the stable lying of the rear roller 33.

[0032] In this embodiment, the aforementioned front roller 23 and rear roller 33 are elastic rollers; the aforementioned elastic rollers are made of high-carbon chromium bearing steel rollers, but high-strength nylon rollers, ethylene plastic rollers or elastic metal composite rollers can also be used; the aforementioned elastic metal composite is preferably an aluminum-based composite, but can also be a nickel-based composite, a titanium-based composite, a particle-reinforced composite or a laminated composite.

[0033] Please refer to Figure 2 and Figure 3 which show that on the upper slide rail 5, that is, at the left end and the right end of the upper slide rail 5, each is equipped with a Figure 2 and Figure 3 as shown in Figure 1An anti-play structure for an automotive seat slide rail with the structure shown, specifically showing a lower slide rail 4. According to professional knowledge, the lower slide rail 4 is fixed to the vehicle floor in the use state. The front side wall and the rear side wall of the lower slide rail 4 are parallel to each other in the length direction, and the space between the front and rear side walls of the lower slide rail forms a lower slide rail cavity 41. The upper part of the lower slide rail cavity 41 in the length direction forms a lower slide rail opening 411. A pair of lower slide rail inner flanges 42 parallel to the front and rear side walls of the lower slide rail are folded towards the lower slide rail cavity 41 in the upper part of the length direction of the front side wall and the rear side wall of the lower slide rail (shown by Figure 3 ). A locking tooth plate locking tooth 421 and a locking tooth plate locking tooth groove 422 are formed in the middle region of the length direction of the pair of lower slide rail inner flanges 42. The locking tooth plate locking tooth 421 and the locking tooth plate locking tooth groove 422 are in a one-by-one position relationship with each other. The spaces between the aforementioned lower slide rail inner flanges 42 and the aforementioned front side wall and the inner side wall of the lower slide rail respectively form upper slide rail outer flange mating cavities 423; a upper slide rail 5 is shown. A pair of upper slide rail outer flanges 51 parallel to the front and rear side walls of the upper slide rail are folded towards the front side wall and the rear side wall of the upper slide rail in the lower part of the length direction of the front side wall and the rear side wall of the upper slide rail 5. The pair of upper slide rail outer flanges 51 are located in the aforementioned upper slide rail outer flange mating cavities 423 ( Figure 3As shown, the upper part of the upper slide rail 5 in the length direction protrudes out of the opening 411 of the lower slide rail, and a seat pan connection nut seat 52 for fixing the seat pan of the vehicle seat in the use state is fixed at each of the left end and the right end of the upper part of the upper slide rail 5. At the left end of a pair of outer folded edges 51 of the upper slide rail 5 and at corresponding front and rear positions, an upper slide rail outer folded edge left roller 511 is provided at each position, and at the right end of the pair of outer folded edges 51 of the upper slide rail 5 and also at corresponding front and rear positions, an upper slide rail outer folded edge right roller 512 is provided at each position. The aforementioned front and rear corresponding upper slide rail outer folded edge left rollers 511 are preferably coaxially arranged, but can also be arranged through respective independent roller shafts. The same applies to the upper slide rail outer folded edge right roller 512. The aforementioned upper slide rail outer folded edge left and right rollers 511 and 512 form a rolling pair with the bottom plate of the lower slide rail cavity 41. At the middle region in the length direction of a pair of outer folded edges 51 of the upper slide rail 5, a locking tooth plate locking tooth 513 and a locking tooth plate locking tooth groove 514 are formed respectively. The locking tooth plate locking tooth 513 and the locking tooth plate locking tooth groove 514 are in a one-by-one position relationship with each other. A vertical and horizontal slide rail locking and unlocking mechanism 6 is shown. The vertical and horizontal slide rail locking and unlocking mechanism 6 is arranged at the middle part of the aforementioned upper slide rail 5 and is engaged or disengaged with the locking tooth plate locking tooth groove 422 and the locking tooth plate locking tooth groove 514. When it is engaged with both the locking tooth plate locking tooth groove 422 and the locking tooth plate locking tooth groove 514 at the same time, the aforementioned upper slide rail 5 is in a locked state with the aforementioned lower slide rail 4, and when the vertical and horizontal slide rail locking and unlocking mechanism 6 is disengaged from the locking tooth plate locking tooth groove 422, the aforementioned upper slide rail 5 is in an unlocked state with the aforementioned lower slide rail 4. From the above description, it can be seen that the aforementioned locking tooth plate locking tooth groove 422 and the locking tooth plate locking tooth groove 514 correspond to each other.

[0034] The characteristics are that at the lower part of the left end and the lower part of the right end of the aforementioned upper slide rail 5, a clearance eliminating mechanism with the structure as shown is provided at each position. The clearance between the cavity wall of the upper slide rail outer folded edge mating cavity 423 formed in the upper slide rail outer folded edge mating cavity 423 and the upper slide rail outer folded edge 51 is compensated by this clearance eliminating mechanism (the clearance compensation means "eliminating the clearance"). Figure 1 Since the shape of the upper slide rail mating frame 1 of the structure system of the clearance eliminating mechanism shown is in a [specific shape], and the width of the cavity of this [specific shape] is adapted to the width of the upper slide rail 5, after the upper slide rail mating frame 1 and the upper slide rail 5 are mated, they are preferably fixed by welding.

[0035] Since Figure 1 the shape of the upper slide rail mating frame 1 of the structure system of the clearance eliminating mechanism shown is in a [specific shape], and the width of the cavity of this [specific shape] is adapted to the width of the upper slide rail 5, after the upper slide rail mating frame 1 and the upper slide rail 5 are mated, they are preferably fixed by welding. shape, and the width of the cavity of this shape is adapted to the width of the upper slide rail 5. Therefore, after the upper slide rail mating frame 1 and the upper slide rail 5 are mated, they are preferably fixed by welding.

[0036] Please continue to see Figure 2 and Figure 3, a dust cover 43 for preventing dust from entering the lower slide rail cavity 41 is fixed to each of the left end and the right end of the aforementioned lower slide rail 4 by dust cover screws 431. Along the length direction of the lower slide rail 4, lower slide rail brackets 44 are preferably fixed at intervals by welding. A pair of spaced lower slide rail carriage floor fixing plates 45 are riveted to the bottom of the lower slide rail 4 by rivets 452. Lower slide rail carriage floor fixing bolt holes 451 are formed in the front and rear sides of the middle part of the lower slide rail carriage floor fixing bracket 45. An upper slide rail movement limit position stop pin 46 passing through the aforementioned lower slide rail cavity 41 is provided at each of the position on the left end of the lower slide rail 4 and to the right of the aforementioned dust cover 43 at the left end and the position on the right end of the lower slide rail 4 and to the left of the dust cover 43 at the right end. The front end and the rear end of the upper slide rail movement limit position stop pin 46 are each limited by a circlip 461; at each of the left end and the right end of a pair of outer folded edges 51 of the aforementioned upper slide rail 5, a roller mating cavity 515 in the shape of is formed. The mating frame bottom plate 11 of the upper slide rail mating frame 1 of the aforementioned backlash elimination mechanism is fixedly welded to the bottom of the upper slide rail 5. The front roller 23 of the structure system of the backlash elimination mechanism mates with the aforementioned roller mating cavities 515 at the left end and the right end of the front outer folded edge among a pair of outer folded edges 51, and the rear roller 33 of the structure system of the backlash elimination mechanism mates with the aforementioned roller mating cavities 515 at the left end and the right end of the rear outer folded edge among a pair of outer folded edges 5 of the upper slide rail. As can be seen from the above description, the present invention not only ensures the self-strength of the backlash elimination mechanism but also significantly enhances the strength of the upper slide rail 5 by the structural form in which the mating frame bottom plate 11 of the upper slide rail mating frame 1 of the structure system of the backlash elimination mechanism shown by Figure 1 is fixedly welded to the bottom of the upper slide rail 5.

[0037] On the top wall of the foregoing upper slide rail 5 and at a position corresponding to the foregoing upper and lower slide rail locking and unlocking mechanism 6, a driving column relief hole 54 communicating with the upper slide rail cavity 53 of the upper slide rail 5 is provided. And on the left side corresponding to the driving column relief hole 54, a left hanging foot 55a of a return spring is formed, and on the right side corresponding to the driving column relief hole 54, a right hanging foot 55b of a return spring is formed. The foregoing upper and lower slide rail locking and unlocking mechanism 6 includes a lock tooth plate 61, a lock tooth plate lifting driving column 62, a lock tooth plate lifting guide seat 63, a left return spring 64 of the lock tooth plate, and a right return spring 65 of the lock tooth plate. On the front side and the rear side in the length direction of the lock tooth plate 61, lock tooth plate locking and unlocking teeth 611 and lock tooth mating grooves 612 are respectively formed. The lock tooth plate locking and unlocking teeth 611 and the lock tooth mating grooves 612 are distributed alternately with each other. And the lock tooth plate locking and unlocking teeth 611 cooperate with or release the cooperation with the foregoing lock tooth plate lock tooth groove 422 and the lock tooth plate locking tooth groove 514. When the lock tooth plate locking and unlocking teeth 611 cooperate with the foregoing lock tooth plate lock tooth groove 422 and the foregoing lock tooth plate locking tooth groove 514 at the same time, the foregoing upper slide rail 5 is in a state of being locked with the lower slide rail 4. And when the lock tooth plate locking and unlocking teeth 611 release the cooperation with the lock tooth plate lock tooth groove 422, the foregoing upper slide rail 5 is in a state of being unlocked with the lower slide rail 4. On the upward side in the middle of the lock tooth plate 61, a pair of lock tooth plate lifting guide columns 613 are fixedly arranged at intervals in a longitudinally parallel state. The pair of lock tooth plate lifting guide columns 613 form a sliding pair with the lifting guide column holes 631 provided at both ends of the lock tooth plate lifting guide seat 63. The lower end of the lock tooth plate lifting driving column 62 is fixed to the upward side in the middle of the lock tooth plate 61. And the upper end of the lock tooth plate lifting driving column 62 sequentially passes through the lock tooth plate lifting guide seat 63 and the foregoing driving column relief hole 54 from bottom to top and extends above the foregoing upper slide rail 5 for a driving handle (not shown in the figure) to cooperate with it (which will be described later). At the upper parts of both ends of the lock tooth plate lifting guide seat 63, a lock tooth plate lifting guide seat fixing screw hole 632 is respectively provided. The lock tooth plate lifting guide seat 63 is fixed to the top of the upper slide rail 5 in the foregoing upper slide rail cavity 53 at a position corresponding to the lock tooth plate lifting guide seat fixing screw hole 632 by a lock tooth plate lifting guide seat fixing screw 6321. The upper end of the left return spring 64 of the lock tooth plate is hung on the foregoing left hanging foot 55a of the return spring, and the lower end is fixed to the left end of the lock tooth plate 61. The upper end of the right return spring 65 of the lock tooth plate is hung on the foregoing right hanging foot 55b of the return spring, and the lower end is fixed to the right end of the lock tooth plate 61.

[0038] The present invention also relates to an automotive seat with a backlash elimination mechanism having the Figure 1 structure shown, that is to say, the automotive seat slide rail used in the automotive seat has a Figure 1 backlash elimination mechanism having the structure shown.

[0039] The applicant needs to explain that: Figure 1 The backlash elimination mechanism having the structure shown is applied to Figure 2In addition to the vehicle seat slide rail of the structural form shown, it can also be used to slide on vehicle seats of other structural forms.

[0040] The applicant describes the process of locking and unlocking the upper and lower slide rails 5 and 4 by the upper and lower slide rail locking and unlocking mechanism 6. Figure 2 When the handle mechanism belonging to the prior art not shown in the figure is operated, the handle mechanism applies downward pressure to the lock plate lifting drive column 62 in a lever effect manner, so that the lock plate lifting drive column 62 pushes the lock plate 61. The lock plate 61 moves downward under the reaction force of the left and right return springs 64 and 65 of the lock plate and under the guidance of a pair of lock plate lifting guide columns 613, so that the lock plate locking and unlocking teeth 611 move downward accordingly and withdraw from the lock plate lock tooth groove 422. At this time, the upper and lower slide rails 5 and 4 are in a state of being unlocked from each other. In this state, the passenger can move the car seat together with the car seat basin through the seat basin connecting nut seat 52 and the upper slide rail 5 in the direction of the car, for example, forward or backward until the car seat is adjusted to the desired position. When the car seat is adjusted to the desired position, the passenger releases the aforementioned handle mechanism. At this time, the lock plate 61 is pulled upward under the synchronous restoring force of the left and right return springs 64, 65 of the aforementioned lock plate, so that the lock and unlock tooth 611 of the lock plate enters upward into the lock tooth groove 422 of the lock plate and the lock tooth groove 514 corresponding to or tending to overlap with the lock tooth groove 422 of the lock plate, thereby putting the upper and lower sliding rails 5, 4 in a locked state.

[0041] In summary, the technical solution provided by the present invention makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. A backlash elimination mechanism, characterized in that: Comprising an upper slide rail fitting frame (1); an upper and lower slide rail front lateral clearance compensation device (2) and an upper and lower slide rail rear lateral clearance compensation device (3), and the upper and lower slide rail front lateral clearance compensation device (2) and the upper and lower slide rail rear lateral clearance compensation device (3) are arranged on the upper slide rail fitting frame (1) in a front and rear corresponding state to each other.

2. The backlash elimination mechanism according to claim 1, wherein: The upper slide rail fitting frame (1) comprises a fitting frame bottom plate (11), a fitting frame front folding plate (12) and a fitting frame rear folding plate (13). The fitting frame front folding plate (12) is formed by folding upwards from the front side in the length direction of the fitting frame bottom plate (11), and a positioning cavity (121) for the upper and lower slide rail front lateral clearance compensation device is formed at the middle position in the upper part of the length direction of the fitting frame front folding plate (12). The fitting frame rear folding plate (13) is formed by folding upwards from the rear side in the length direction of the fitting frame bottom plate (11), and a positioning cavity (131) for the upper and lower slide rail rear lateral clearance compensation device is formed at the middle position in the upper part of the length direction of the fitting frame rear folding plate (13). The positioning cavities (121, 131) for the upper and lower slide rail front and rear lateral clearance compensation devices correspond to each other front and rear and are each formed with an open upper part. The upper and lower slide rail front lateral clearance compensation device (2) is positioned on the fitting frame front folding plate (12) at a position corresponding to the positioning cavity (121) for the upper and lower slide rail front lateral clearance compensation device, and the upper and lower slide rail rear lateral clearance compensation device (3) is positioned on the fitting frame rear folding plate (13) at a position corresponding to the positioning cavity (131) for the upper and lower slide rail rear lateral clearance compensation device.

3. The backlash elimination mechanism according to claim 2, characterized in that: The upper and lower slide rail front lateral clearance compensation device (2) comprises a front folding plate embedding part (21), a front roller support frame (22) and a front roller (23). The front folding plate embedding part (21) is fitted with the fitting frame front folding plate (12) at a position corresponding to the positioning cavity (121) for the upper and lower slide rail front lateral clearance compensation device. The front roller support frame (22) is inserted and fitted with the front folding plate embedding part (21). The front roller (23) is arranged in a lying state on the front roller support frame (22), and the left end face and the right end face of the front roller (23) are fitted with the front folding plate embedding part (21). The upper and lower slide rail rear lateral clearance compensation device (3) comprises a rear folding plate embedding part (31), a rear roller support frame (32) and a rear roller (33). The rear folding plate embedding part (31) is fitted with the fitting frame rear folding plate (13) at a position corresponding to the positioning cavity (131) for the upper and lower slide rail rear lateral clearance compensation device. The rear roller support frame (32) is inserted and fitted with the rear folding plate embedding part (31). The rear roller (33) is arranged in a lying state on the rear roller support frame (32), and the left end face and the right end face of the rear roller (33) are fitted with the rear folding plate embedding part (31).

4. The backlash elimination mechanism according to claim 3, characterized in that: The front folding plate insert (21) includes an upper and lower slide rail front lateral clearance compensation plate (211), a left front fitting foot (212) and a right front fitting foot (213). The upper and lower slide rail front lateral clearance compensation plate (211) is arched and the arching direction of the arch faces forward. The front side of the left front fitting foot (212) forms an integral structure with the left end of the upper and lower slide rail front lateral clearance compensation plate (211), and the left front fitting foot (212) forms a left front fitting foot zigzag fitting cavity (2121). The front side of the right front fitting foot (213) forms an integral structure with the right end of the upper and lower slide rail front lateral clearance compensation plate (211), and the right front fitting foot (213) forms a right front fitting foot zigzag fitting cavity (2131). Wherein, the left and right front fitting feet (212, 213) are connected by a front fitting foot connecting plate (214) with a front clearance (2141) that is both parallel to each other in the front-back direction and maintains a thickness equal to that of the front folding plate (12) of the fitting frame. The left and right front fitting feet The widths of the zigzag fitting cavities (2121, 2131) are adapted to the thickness of the front folding plate (12) of the fitting frame, and the left and right front fitting feet The zigzag fitting cavities (2121, 2131) are fitted with the front side plate (12) of the fitting frame at positions corresponding to the left end and the right end of the upper and lower slide rail front lateral clearance compensation device positioning cavity (121), and the front clearance (2141) is inserted and fitted with the front folding plate (12) corresponding to the bottom of the upper and lower slide rail front lateral clearance compensation device positioning cavity (121); The front roller support frame (22) includes a front insertion plate (221) and a front roller bed (222). The front insertion plate (221) is inserted between the upper and lower slide rail front lateral clearance compensation plate (211) and the facing sides of the left front fitting foot (212) and the right front fitting foot (213). The front roller bed (222) forms an integral structure with the rear side in the length direction of the front insertion plate (221). The front roller (23) is arranged in a lying state on the front roller bed (222). The left end face of the front roller (23) is in contact with the end face of the left front fitting foot (212) facing the right front fitting foot (213), and the right end face of the front roller (23) is in contact with the end face of the right front fitting foot (213) facing the left front fitting foot (212). The rear folding plate insert (31) includes an upper and lower slide rail rear lateral clearance compensation plate (311), a left rear fitting foot (312) and a right rear fitting foot (313). The upper and lower slide rail rear lateral clearance compensation plate (311) is arched and the arching direction of the arch faces backward. The rear side of the left rear fitting foot (312) forms an integral structure with the left end of the upper and lower slide rail rear lateral clearance compensation plate (311), and the left rear fitting foot (312) forms a left rear fitting foot The glyph-shaped cavity (3121), the rear side of the right rear fitting foot (313) and the right end of the upper and lower slide rail rear side clearance compensation plate (311) form an integral structure, and the right rear fitting foot (313) forms a right rear fitting foot glyph-shaped cavity (3131), wherein, between the left and right rear fitting feet (312, 313) is connected by a rear fitting foot connecting plate (314) having a rear clearance (3141) which is both parallel to each other rearward and has a thickness equal to that of the mating frame rear folding plate (13) between them, the left and right rear fitting feet The widths of the glyph-shaped cavities (3121, 3131) are adapted to the thickness of the mating frame rear folding plate (13), and the left and right rear fitting feet The glyph-shaped cavities (3121, 3131) are fitted with the mating frame rear side plate (13) at positions corresponding to the left end and the right end of the upper and lower slide rail rear side clearance compensation device positioning cavity (131), and the rear clearance (3141) is inserted and fitted with the mating frame rear folding plate (13) corresponding to the bottom of the upper and lower slide rail rear side clearance compensation device positioning cavity (131); the rear roller support frame (32) includes a rear insertion plate (321) and a rear roller bed (322), the rear insertion plate (321) is inserted between the upper and lower slide rail rear side clearance compensation plate (311) and the facing sides of the left rear fitting foot (312) and the right rear fitting foot (313), the rear roller bed (322) forms an integral structure with the rear side in the length direction of the rear insertion plate (321), the rear roller (33) is arranged in a lying state on the rear roller bed (322), the left end face of the rear roller (33) is in contact with the end face of the left rear fitting foot (312) facing the right rear fitting foot (313), and the right end face of the rear roller (33) is in contact with the end face of the right rear fitting foot (313) facing the left rear fitting foot (312), 5. The backlash elimination mechanism according to claim 4, characterized in that: On one side of the front roller bed (222) facing the upward direction of the length direction, a downwardly concave front roller bed semi-circular arc cavity (2221) is formed. On one side of the rear roller bed (322) facing the upward direction of the length direction, a downwardly concave rear roller bed semi-circular arc cavity (3221) is formed.

6. The backlash elimination mechanism according to claim 4, characterized in that: The front roller (23) and the rear roller (33) are elastic rollers; the elastic rollers are high-carbon chromium bearing steel rollers, high-strength nylon rollers, ethylene plastic rollers or elastic metal composite rollers; the elastic metal composite is aluminum-based composite, nickel-based composite, titanium-based composite, particle-reinforced composite or layered composite.

7. An automotive seat slide rail, comprising a lower slide rail (4), which is fixed to the carriage floor of the vehicle in the use state. The front side wall and the rear side wall of the lower slide rail (4) are parallel to each other in the length direction, and the space between the front and rear side walls of the lower slide rail forms a lower slide rail cavity (41). The upper part in the length direction of the lower slide rail cavity (41) is formed as an open mouth of the lower slide rail (411). A pair of inwardly folded edges of the lower slide rail (42) parallel to the front and rear side walls of the lower slide rail are folded towards the lower slide rail cavity (41) in the upper part of the length direction of the front and rear side walls of the lower slide rail. A locking tooth plate locking tooth (421) and a locking tooth plate locking tooth groove (422) are formed in the middle area in the length direction of the pair of inwardly folded edges of the lower slide rail (42). The locking tooth plate locking tooth (421) and the locking tooth plate locking tooth groove (422) are arranged in a one-by-one staggered position relationship with each other. The spaces between the inwardly folded edges of the lower slide rail (42) and the front side wall and the inner side wall of the lower slide rail are each formed as a mating cavity for the outwardly folded edge of the upper slide rail (423); an upper slide rail (5), a pair of outwardly folded edges of the upper slide rail (51) parallel to the front and rear side walls of the upper slide rail are folded towards the front and rear side walls of the upper slide rail in the lower part of the length direction of the front and rear side walls of the upper slide rail. The pair of outwardly folded edges of the upper slide rail (51) is located in the mating cavity for the outwardly folded edge of the upper slide rail (423). The upper part in the length direction of the upper slide rail (5) protrudes out of the open mouth of the lower slide rail (411). A seat basin connection nut seat (52) for fixing the seat basin of the vehicle seat in the use state is fixed to the left end and the right end of the upper part of the upper slide rail (5). An upper slide rail outwardly folded edge left roller (511) is arranged at the left end of the pair of outwardly folded edges of the upper slide rail (51) and at the corresponding front and rear positions, and an upper slide rail outwardly folded edge right roller (512) is arranged at the right end of the pair of outwardly folded edges of the upper slide rail (51) and at the corresponding front and rear positions. The left and right rollers of the outwardly folded edge of the upper slide rail (511, 512) form a rolling pair with the bottom plate of the lower slide rail cavity (41). A locking tooth plate locking tooth (513) and a locking tooth plate locking tooth groove (514) are formed in the middle area in the length direction of the pair of outwardly folded edges of the upper slide rail (51). The locking tooth plate locking tooth (513) and the locking tooth plate locking tooth groove (514) are arranged in a one-by-one staggered position relationship with each other; an upper and lower slide rail locking and unlocking mechanism (6), which is arranged in the middle of the upper slide rail (5) and is matched or disengaged with the locking tooth plate locking tooth groove (422) and the locking tooth plate locking tooth groove (514). When it is simultaneously matched with the locking tooth plate locking tooth groove (422) and the locking tooth plate locking tooth groove (514), the upper slide rail (5) is in a locked state with the lower slide rail (4). When the upper and lower slide rail locking and unlocking mechanism (6) is disengaged from the locking tooth plate locking tooth groove (422), the upper slide rail (5) is in an unlocked state with the lower slide rail (4). It is characterized in that: At the lower part of the left end and the lower part of the right end of the upper slide rail (5), a clearance eliminating mechanism as described in Claim 1 is respectively provided. The clearance between the cavity wall formed in the outer flange fitting cavity (423) of the upper slide rail and the outer flange (51) of the upper slide rail is compensated by the clearance eliminating mechanism within the outer flange fitting cavity (423) of the upper slide rail.

8. The motor vehicle seat slide rail according to claim 7, characterized in that: At the left end and the right end of the lower slide rail (4), a dust-proof cover (43) for preventing dust and impurities from entering the lower slide rail cavity (41) is respectively fixed. The lower slide rail brackets (44) are fixedly spaced in the length direction of the lower slide rail (4). And at least a pair of spaced lower slide rail carriage floor fixing plates (45) are riveted to the bottom of the lower slide rail (4) by rivets (452). At the front and rear sides of the middle part of the lower slide rail carriage floor fixing frame (45), lower slide rail carriage floor fixing frame fixing bolt holes (451) are respectively opened. At the left end of the lower slide rail (4) and at the position on the right side of the dust-proof cover (43) at the left end, and at the right end of the lower slide rail (4) and at the position on the left side of the dust-proof cover (43) at the right end, an upper slide rail movement limit position stop pin (46) passing through the lower slide rail cavity (41) is respectively provided. The front end and the rear end of the upper slide rail movement limit position stop pin (46) are respectively limited by snap rings (461). At the left end and the right end of a pair of outer flanges (51) of the upper slide rail (5), a roller fitting cavity (515) is respectively opened. The fitting frame bottom plate (11) of the upper slide rail fitting frame (1) of the clearance eliminating mechanism is fixedly welded to the bottom of the upper slide rail (5). And the front roller (23) is fitted with the roller fitting cavities (515) at the left end and the right end of the front outer flange among a pair of outer flanges (51), while the rear roller (33) is fitted with the roller fitting cavities (515) at the left end and the right end of the rear outer flange among a pair of outer flanges (5).

9. The motor vehicle seat slide according to claim 7, characterized in that: On the top wall of the upper slide rail (5) and at a position corresponding to the upper and lower slide rail locking and unlocking mechanism (6), a driving column relief hole (54) communicating with the upper slide rail cavity (53) of the upper slide rail (5) is provided. And a left hanging foot (55a) of the return spring is formed on the left side corresponding to the driving column relief hole (54), and a right hanging foot (55b) of the return spring is formed on the right side corresponding to the driving column relief hole (54). The upper and lower slide rail locking and unlocking mechanism (6) includes a lock tooth plate (61), a lock tooth plate lifting driving column (62), a lock tooth plate lifting guide seat (63), a left return spring (64) of the lock tooth plate and a right return spring (65) of the lock tooth plate. On the front side and the rear side in the length direction of the lock tooth plate (61), lock tooth plate locking and unlocking teeth (611) and lock tooth engaging grooves (612) are respectively formed. The lock tooth plate locking and unlocking teeth (611) and the lock tooth engaging grooves (612) are distributed alternately with each other, and the lock tooth plate locking and unlocking teeth (611) are engaged or disengaged with the lock tooth plate lock tooth groove (422) and the lock tooth plate locking tooth groove (514). When the lock tooth plate locking and unlocking teeth (611) are simultaneously engaged with the lock tooth plate lock tooth groove (422) and the lock tooth plate locking tooth groove (514), the upper slide rail (5) is in a state of being locked with the lower slide rail (4). And when the lock tooth plate locking and unlocking teeth (611) are disengaged from the lock tooth plate lock tooth groove (422), the upper slide rail (5) is in a state of being unlocked from the lower slide rail (4). On the upper side facing upward in the middle of the lock tooth plate (61), a pair of lock tooth plate lifting guide columns (613) are fixedly arranged at intervals in a longitudinally parallel state. The pair of lock tooth plate lifting guide columns (613) form a sliding pair with the lifting guide column holes (631) provided at both ends of the lock tooth plate lifting guide seat (63). The lower end of the lock tooth plate lifting driving column (62) is fixed to the upper side in the middle of the lock tooth plate (61), and the upper end of the lock tooth plate lifting driving column (62) sequentially passes through the lock tooth plate lifting guide seat (63) and the driving column relief hole (54) from bottom to top and extends above the upper slide rail (5) for a driving handle to cooperate with it. At the upper parts of both ends of the lock tooth plate lifting guide seat (63), a lock tooth plate lifting guide seat fixing screw hole (632) is respectively provided. The lock tooth plate lifting guide seat (63) is fixed to the top of the upper slide rail (5) in the upper slide rail cavity (53) at a position corresponding to the lock tooth plate lifting guide seat fixing screw hole (632) by a lock tooth plate lifting guide seat fixing screw (6321). The upper end of the left return spring (64) of the lock tooth plate is hung on the left hanging foot (55a) of the return spring, and the lower end is fixed to the left end of the lock tooth plate. The upper end of the right return spring (65) of the lock tooth plate is hung on the right hanging foot (55b) of the return spring, and the lower end is fixed to the right end of the lock tooth plate.

10. An automotive seat, characterized in that: Having the vehicle seat slide rail as claimed in claim 7.

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