Seat slide adjustment device

Abstract

The application belongs to the technical field of seat slide rails, and particularly relates to a seat slide rail adjusting device. The seat slide rail adjusting device comprises a power device, a transmission mechanism and a slide rail. The transmission mechanism comprises a cable, a worm wheel, a worm, a separable screw, a screw rod and a driving support. A first locking structure is arranged on the outer wall of the separable screw which is fixed axially relative to the upper slide rail. The separable screw comprises at least two sub-screws. An elastic ring is sleeved on the holding end of the separable screw. The cable is used for pulling the driving support to move axially. An elastic reset member is arranged between the cable and the upper slide rail. The worm wheel is rotatably installed on the mounting portion of the driving support. A second locking structure is arranged on the worm wheel. The separable screw can be inserted into the mounting hole of the worm wheel and be threadedly connected with the screw rod when the sub-screw is held. The separation portion of the driving support is provided with a conical structure on the side of the opening end. The conical structure can be inserted into the internal thread hole of the opening end, so that the sub-screw is separated from the screw rod.

Description

Technical Field

[0001] This invention belongs to the field of seat slide rail technology, and in particular relates to a seat slide rail adjustment device. Background Technology

[0002] There are two ways to adjust car seats: manual and electric. Manual seat adjustment is faster, while electric adjustment uses a motor to adjust the seat rails, offering precise positioning, less effort, and a more luxurious feel. Currently, most cars can only achieve either electric or manual adjustment separately, and cannot simultaneously combine the precision, effortlessness, and luxury of electric adjustment with the speed of manual adjustment. This is especially true for mid-to-large SUVs / MPVs with three rows of seats, which require seat rail adjustment systems that combine both electric and manual functions to quickly move the second-row seats for easy access to the third-row passengers while retaining the electric function of the second-row seats. Summary of the Invention

[0003] The purpose of this invention is to provide a seat slide rail adjustment device that enables the seat slide rail to simultaneously possess the precision and effortlessness of electric adjustment and the speed of manual adjustment.

[0004] To address the aforementioned technical problems, this invention provides a seat slide rail adjustment device, comprising a power unit, a transmission mechanism, and a slide rail. The slide rail includes a lower slide rail and an upper slide rail supported on the lower slide rail. The transmission mechanism includes a cable, a worm gear, a worm, a separable threaded component, a lead screw, and a drive bracket. The lead screw is fixed within the lower slide rail and passes through the worm gear and the separable threaded component along its axial direction. The power unit and the worm are mounted on the upper slide rail, and the output shaft of the power unit is connected to the worm.

[0005] The separable threaded component is axially fixed relative to the upper slide rail. The separable threaded component is provided with an internal threaded hole. The outer wall of the separable threaded component is provided with a first locking structure. The separable threaded component includes at least two sub-threaded components that can be circumferentially combined to form a complete threaded component. The separable threaded component has a clamping end and an opening end. An elastic ring is sleeved on the outer circumferential surface of the clamping end for clamping the multiple sub-threaded components.

[0006] The drive bracket is mounted on the upper slide rail, and one end of the cable is fixed to the drive bracket for pulling the drive bracket to move along the axial direction of the lead screw. An elastic reset member is provided between the cable and the upper slide rail. The drive bracket has a mounting part and a separation part that are spaced apart along the axial direction of the lead screw. The separable threaded part is located between the mounting part and the separation part. The worm wheel is rotatably mounted on the mounting part and is axially fixed relative to the mounting part. The worm wheel is provided with a mounting hole that passes through it along its axial direction. The inner wall of the worm wheel is provided with a second locking structure for circumferentially blocking the first locking mechanism. The separable threaded part can be inserted into the mounting hole and threadedly connected to the lead screw when the sub-threaded part is clamped.

[0007] The separating part is provided with a tapered structure on the side facing the opening end. The tapered structure gradually contracts radially inward as it approaches the opening end. The tapered structure can be inserted into the internal threaded hole of the opening end so that the sub-threaded part overcomes the elastic ring and disengages radially outward from the lead screw.

[0008] Optionally, the opening of the internal threaded hole at the open end is a flare, which gradually tilts radially outward as it moves away from the clamping end, to guide the tapered structure into the internal threaded hole.

[0009] Optionally, the conical structure is a conical rotating body that rotates about the axis of the lead screw, and the conical rotating body is provided with a central hole that extends along the axial direction of the lead screw, through which the lead screw passes.

[0010] Optionally, the drive bracket includes a mounting bracket and a separation bracket, the separation bracket being detachably connected to the mounting bracket, the worm gear being rotatably mounted on the mounting bracket, and the conical rotating body being disposed on the separation bracket.

[0011] Optionally, the mounting bracket includes a mounting plate and a cantilever. The mounting plate extends along a direction perpendicular to the axis of the lead screw. The cantilever is formed by extending from the upper end of the mounting plate toward the side close to the separation bracket. The separation bracket is detachably connected to the end of the cantilever. The mounting plate is provided with a limiting hole that passes through the axis of the lead screw. A circumferential groove is provided on the outer wall of the end of the worm gear. The mounting plate is sleeved on the worm gear and snaps into the circumferential groove.

[0012] Optionally, it also includes a fixed bracket fixed on the upper slide rail, the fixed bracket being located between the mounting part and the separating part, the fixed bracket having a limiting groove, the outer wall of the open end of the separable threaded part protruding radially outward to form a flange, the flange being inserted into the limiting groove, and the fixed bracket and the flange being engaged in a stop fit along the axial direction of the lead screw.

[0013] Optionally, the fixing bracket includes a first fixing plate and a second fixing plate, which are spaced apart along the axial direction of the lead screw to form the limiting groove. The first fixing plate and the second fixing plate are provided with through holes for the lead screw to pass through, and the diameter of the through holes is larger than the outer wall diameter at the widest point of the tapered structure.

[0014] Optionally, the upper end of the fixed bracket and the separating part extends upward from the upper slide rail, one end of the cable is fixed to the separating part, and the elastic reset member is disposed between the fixed bracket and the separating part.

[0015] Optionally, the inner wall of the worm gear is provided with multiple keyways, which are spaced apart along the circumference of the worm gear and extend through the axial direction of the worm gear. The keyways constitute the first stop structure. The outer wall of the separable threaded part is provided with corresponding stop keys, which are spaced apart along the circumference of the lead screw and extend through the axial direction of the lead screw. The stop keys constitute the second stop structure. The stop keys can be inserted into the corresponding keyways when the separable threaded part passes into the mounting hole.

[0016] Optionally, the separable threaded component includes a first sub-threaded component and a second sub-threaded component, both of which are half-threaded components. The first sub-threaded component is provided with a semi-cylindrical first sub-threaded hole extending along its axial direction, and the second sub-threaded component is provided with a semi-cylindrical second sub-threaded hole extending along its axial direction.

[0017] The first sub-threaded hole and the second sub-threaded hole form the internal threaded hole when the first sub-threaded component and the second sub-threaded component are tightly engaged. The first sub-threaded component and the second sub-threaded component can move away from each other in a direction perpendicular to the axis of the lead screw when the tapered structure is inserted into the internal threaded hole, so as to disengage from the lead screw. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a seat slide rail adjustment device provided in an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 Another structural diagram of (hidden upper slide rail);

[0020] Figure 3 yes Figure 2 Assembly diagram of the transmission mechanism and power unit in electric operation mode;

[0021] Figure 4 yes Figure 3 A longitudinal section view of the transmission mechanism in the diagram;

[0022] Figure 5 yes Figure 3 Assembly drawing of the separable threaded parts and the fixed bracket;

[0023] Figure 6 yes Figure 2 A diagram showing the state of the transmission mechanism during the initial stroke of cable tensioning.

[0024] Figure 7 yes Figure 2 A schematic diagram of the transmission mechanism in manual operation mode;

[0025] Figure 8 yes Figure 7 Longitudinal section view.

[0026] The reference numerals in the accompanying drawings are as follows:

[0027] 100. Power unit; 101. Flexible shaft; 201. Lower slide rail; 202. Upper slide rail; 300. Transmission mechanism;

[0028] 1. Worm gear; 2. Drive bracket; 21. Mounting bracket; 22. Separating bracket; 23. Conical structure; 3. Cable; 4. Elastic reset component; 5. Separable threaded component; 51. Flange; 52. Mounting groove; 53. Flaring; 6. Lead screw; 7. Worm gear; 8. Fixed bracket; 81. First fixed plate; 82. Second fixed plate; 9. Elastic ring. Detailed Implementation

[0029] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0030] like Figures 1 to 4 As shown, an embodiment of the present invention provides a seat slide rail adjustment device, including a power unit 100, a transmission mechanism 300 and a slide rail 200. The slide rail 200 includes a lower slide rail 201 and an upper slide rail 202 supported on the lower slide rail 201. The upper slide rail 202 is fixed on the seat, and the lower slide rail 201 is fixed on the floor of the vehicle. When adjusting the seat position, the upper slide rail 202 moves axially relative to the lower slide rail 201.

[0031] The transmission mechanism 300 includes a cable 3, a worm gear 7, a worm 1, a separable threaded component 5, a lead screw 6, and a drive bracket 2. The lead screw 6 is fixed inside the lower slide rail 201 and passes through the worm gear 7 and the separable threaded component 5 along its axial direction. The power unit 100 and the worm 1 are mounted on the upper slide rail 202, and the worm 1 is connected to the output shaft of the power unit 100.

[0032] The separable threaded component 5 is axially fixed relative to the upper slide rail 202. The separable threaded component 5 is provided with an internal threaded hole. The outer wall of the separable threaded component 5 is provided with a first locking structure. The separable threaded component 5 includes at least two sub-threaded components that can be circumferentially combined to form a complete threaded component. The separable threaded component 5 has a clamping end and an opening end. An elastic ring 9 is sleeved on the outer circumferential surface of the clamping end for clamping multiple sub-threaded components.

[0033] The drive bracket 2 is mounted on the upper slide rail 202 and can move axially along the lead screw 6. The drive bracket 2 has a mounting part and a separating part distributed at intervals along the axial direction of the lead screw 6. The separable threaded part 5 is located between the mounting part and the separating part. A tapered structure 23 is provided on the side of the separating part facing the opening end. The tapered structure 23 gradually contracts radially inward as it approaches the opening end. The worm gear 7 is rotatably mounted on the mounting part and is axially fixed relative to the mounting part. The worm gear 7 has a mounting hole that passes through it along its axial direction. A second locking structure is provided on the inner wall of the worm gear 7.

[0034] One end of the cable 3 is fixed to the drive bracket 2 and is used to pull the drive bracket 2 to move axially. An elastic reset element 4 is provided between the cable 3 and the upper slide rail 202. The transmission mechanism 300 has a manual operating state and an electric operating state. Pulling the cable 3, as... Figure 6 As shown, the cable 3 overcomes the elastic force of the elastic reset member 4, driving the drive bracket 2 to move axially along the lead screw 6. The worm gear 7, which is axially fixed to the mounting part, moves synchronously with the drive bracket 2. In the initial stroke of the axial movement, the worm gear 7 separates from the separable threaded member 5, and the conical structure 23 gradually approaches the separable threaded member 5. Figure 7 and Figure 8 As shown, during the latter part of the axial movement, since the separable threaded part 5 is fixed axially to the upper slide rail 202, when the tapered structure 23 is inserted into the internal threaded hole, the tapered structure 23 can push the sub-threaded part radially outward, so that the sub-threaded part overcomes the elastic force of the elastic ring 9 and moves radially outward to disengage from the lead screw 6. The transmission mechanism 300 enters the manual working state, thereby enabling manual and rapid adjustment of the seat position and realizing the manual adjustment function of the seat slide rail adjustment device.

[0035] When the cable 3 is released, the drive bracket 2 moves in the opposite direction under the elastic force of the elastic reset member 4. The worm gear 7 moves in the opposite direction along with the drive bracket 2. In the first part of the reverse movement, the tapered structure 23 disengages from the internal threaded hole of the separable threaded member 5, causing the sub-threaded members to be tightly bound together under the elastic force of the elastic ring 9. In the second part of the reverse movement, the worm gear 7 meshes with the worm 1, the separable threaded member 5 passes into the mounting hole, the first stop structure and the second stop structure engage circumferentially, the lead screw 6 is threadedly connected to the separable threaded member 5, and the transmission mechanism 300 enters the electric working state. The power unit 100 drives the worm gear 7 to rotate through the worm 1, causing the separable threaded member 5 to rotate and move axially on the lead screw 6, thereby driving the upper slide rail 202 to move axially, so as to realize the electric adjustment function of the seat slide rail adjustment device.

[0036] In the seat slide rail adjustment device of the present invention, the power unit 100 can drive the worm wheel 7 to rotate via the worm gear 1. The separable threaded part 5, which is circumferentially stopped by the worm wheel 7, rotates and moves axially on the lead screw 6, thereby driving the upper slide rail 202 to move, thus realizing the electric adjustment of the seat position. The worm wheel 7, which is rotatably mounted on the drive bracket 2, can move axially synchronously when the cable 3 pulls the drive bracket 2, thereby separating from the separable threaded part 5 and disengaging from the worm gear 1. Furthermore, when the drive bracket 2 moves axially, the tapered structure 23 on the mounting part inserts into the internal threaded hole of the separable threaded part 5. Under the action of the tapered structure 23, the sub-threaded parts move radially outward away from each other, causing the sub-threaded parts to disengage from the lead screw 6, thereby enabling manual adjustment of the seat position. Therefore, the seat slide rail adjustment device of the present invention has both electric adjustment mode and manual adjustment mode, and the electric adjustment mode and the manual adjustment mode share a set of slide rails 200, reducing the size and cost of the seat slide rail adjustment device.

[0037] In one embodiment, two slide rails 200 are provided, arranged in parallel. Correspondingly, two transmission mechanisms 300 are provided. The power unit 100 drives the two upper slide rails 202 to move through the two transmission mechanisms 300 respectively, so that the seat moves more smoothly. Figures 1 to 8 Only one of the slide rails, 200, is displayed.

[0038] In one embodiment, the power unit 100 is an electric motor, and the flexible shaft 101 of the motor is connected to the worm gear 1, for example, by a key connection.

[0039] In one embodiment, the side wall of the upper slide rail 202 is provided with a through hole for the worm gear 1 to pass through.

[0040] In one embodiment, a circumferentially extending mounting groove 52 is provided on the outer wall of the clamping end of the separable threaded member 5, and the elastic ring 9 is installed in the mounting groove 52.

[0041] In one embodiment, the elastic coil 9 is a spring coil.

[0042] In other embodiments, the elastic ring 9 can be a rubber ring.

[0043] In one embodiment, the opening of the internal threaded hole at the open end is a flared end 53, which gradually tilts radially outward as it moves away from the clamping end, so as to guide the tapered structure 23 into the internal threaded hole.

[0044] In one embodiment, the tapered structure 23 is a tapered rotating body that rotates about the axis of the lead screw 6. The tapered rotating body has a central hole that extends along the axial direction of the lead screw 6, through which the lead screw 6 passes. The tapered rotating body has high structural strength, and the contact surface between the tapered rotating body and the wall of the internal threaded hole is large, allowing each position on the sub-threaded component to withstand the thrust of the tapered rotating body, which is beneficial for the sub-threaded component to move radially outward.

[0045] In one embodiment, the drive bracket 2 includes a mounting bracket 21 and a separating bracket 22, which is detachably connected to the mounting bracket 21. The worm gear 7 is rotatably mounted on the mounting bracket 21, and the conical rotating body is disposed on the separating bracket 22. Since the lead screw 6 passes through the conical rotating body, the worm gear 7, and the separable threaded part 5, and the worm gear 7 and the separable threaded part 5 are located between the mounting part and the separating part, the drive bracket 2 is designed as a split structure to facilitate the installation and removal of the lead screw 6, the conical rotating body, the worm gear 7, and the separable threaded part 5.

[0046] In one embodiment, the mounting bracket 21 includes a mounting plate and a cantilever. The mounting plate extends in a direction perpendicular to the axis of the lead screw 6, and the cantilever is formed by extending from the upper end of the mounting plate towards the side near the separation bracket 22. The separation bracket 22 is detachably connected to the end of the cantilever. The mounting plate is provided with a limiting hole that passes through the axial direction of the lead screw 6, and a circumferential groove is provided on the outer wall of the end of the worm gear 7. The mounting plate is sleeved on the worm gear 7 and engaged in the circumferential groove. In this way, the worm gear 7 can rotate in the mounting hole, and the mounting plate engaged in the circumferential groove can also stop the worm gear 7 axially, so that the worm gear 7 can move axially synchronously with the drive bracket 2. The mounting plate has a simple structure and is easy to manufacture.

[0047] Specifically, the separation bracket 22 can be fixed to the cantilever by one of the following methods: screws, rivets, or other detachable connections.

[0048] In one embodiment, such as Figure 4 and Figure 5As shown, it also includes a fixed bracket 8 fixed on the upper slide rail 202. The fixed bracket 8 is located between the mounting part and the separating part. The fixed bracket 8 has a limiting groove. The outer wall of the open end of the separable threaded part 5 protrudes radially outward to form a flange 51. The flange 51 is inserted into the limiting groove. The fixed bracket 8 and the flange 51 are stopped and engaged along the axial direction of the screw 6, so that the separable threaded part 5 is relatively fixed to the upper slide rail 202.

[0049] In one embodiment, the fixed bracket 8 includes a first fixed plate 81 and a second fixed plate 82. The first fixed plate 81 and the second fixed plate 82 are spaced apart along the axial direction of the lead screw 6 to form a limiting groove. The first fixed plate 81 and the second fixed plate 82 are provided with through holes for the lead screw 6 to pass through. The diameter of the through holes is larger than the outer wall diameter at the widest point of the tapered structure 23, so that the tapered structure 23 can pass through the through holes and be inserted into the internal thread hole of the worm gear 7.

[0050] In one embodiment, the first fixing plate 81 extends in a direction perpendicular to the axis of the lead screw 6, the upper end of the second fixing plate 82 is fixed to the first fixing plate 81, and the lower end of the second fixing plate 82 is bent away from the first fixing plate 81 to form the aforementioned limiting groove between the second fixing plate 82 and the first fixing plate 81.

[0051] In other embodiments, the first fixing plate 81 and the second fixing plate 82 may both extend in a direction perpendicular to the axis of the lead screw 6, and the first fixing plate 81 and the second fixing plate 82 are respectively fixed on the upper slide rail 202.

[0052] In one embodiment, the upper ends of the fixed bracket 8 and the separating part extend upwards through the upper slide rail 202, one end of the cable 3 is fixed to the separating part, and the elastic reset member 4 is disposed between the fixed bracket 8 and the separating part.

[0053] Specifically, the top wall of the upper slide rail 202 is provided with a through groove for the upper end of the fixed bracket 8 to extend out, and the top wall of the upper slide rail 202 is provided with a clearance groove extending along the axial direction of the lead screw 6. The upper ends of the separation part and the mounting part extend out of the upper slide rail 202 through the clearance groove and can move axially within the clearance groove. One end of the cable 3 passes through the fixed bracket 8 and is fixed to the separation part. The elastic reset member 4 is provided between the fixed bracket 8 and the separation part.

[0054] In one embodiment, the elastic reset member 4 is a spring, which is sleeved on the cable 3 structure.

[0055] In other embodiments, the elastic reset member 4 can be a rubber member, which is fixed on the upper slide rail 202.

[0056] In one embodiment, a plurality of keyways are provided on the inner wall of the worm gear 7. The plurality of keyways are spaced apart along the circumferential direction of the worm gear 7 and extend through the axial direction of the worm gear 7. The keyways constitute a first stop structure. A corresponding stop key is provided on the outer wall of the separable threaded part 5. The plurality of stop keys are spaced apart along the circumferential direction of the lead screw 6 and extend along the axial direction of the lead screw 6. The stop key constitutes a second stop structure. When the separable threaded part 5 is inserted into the mounting hole, the stop key is inserted into the corresponding keyway.

[0057] Specifically, the longitudinal section of the stop key can be rectangular or triangular.

[0058] In other embodiments, the stop key can be disposed on the inner wall of the worm gear 7, and the keyway can be disposed on the outer wall of the separable threaded part 5. In this case, the stop key constitutes the first stop structure, and the keyway constitutes the second stop structure.

[0059] In one embodiment, the separable threaded component 5 includes a first sub-threaded component and a second sub-threaded component, both of which are half-threaded components. The first sub-threaded component is provided with a semi-cylindrical first sub-threaded hole extending along its axial direction, and the second sub-threaded component is provided with a semi-cylindrical second sub-threaded hole extending along its axial direction.

[0060] In the electric working position, the first and second sub-threaded parts are clamped together, and the first and second threaded holes form an internal threaded hole; in the manual working position, the tapered structure 23 is inserted into the internal threaded hole, so that the first and second sub-threaded parts move away from each other in a direction perpendicular to the axis of the lead screw 6, so as to disengage from the lead screw 6.

[0061] In other embodiments, the opening of the internally threaded hole at the open end may be rounded.

[0062] In other embodiments, the tapered structure 23 may consist of a plurality of circumferentially distributed push plates, the end of which is away from the separable threaded member 5 is fixed to the separation part, and the end of which is close to the separable threaded member 5 gradually tilts radially inward.

[0063] In other embodiments, the drive bracket 2 can be a one-piece structure.

[0064] In other embodiments, the mounting bracket 21 is provided with a plurality of pawls spaced apart along the circumferential direction, and the end face of the worm gear 7 is provided with an inverted T-shaped groove extending along the circumferential direction. The pawls are inserted into the groove along the axial direction of the lead screw 6, and the pawls and the side wall of the groove are axially blocked to allow the worm gear 7 to be rotated and mounted on the mounting bracket 21. At the same time, when the mounting bracket 21 moves axially, it can drive the worm gear 7 to move synchronously.

[0065] In other embodiments, the fixed bracket 8 can be omitted, and two sets of column groups distributed at intervals along the axial direction of the lead screw 6 can be provided on the inner wall of the upper slide rail 202. The column group includes two stop columns symmetrically distributed on both sides of the axis of the lead screw 6, and a limiting groove for the flange 51 to be inserted is formed between the two sets of column groups.

[0066] In other embodiments, the limiting groove can be directly machined by slotting the fixed bracket 8.

[0067] In other embodiments, the elastic reset member 4 can be disposed between the mounting part and the fixing part, or an abutment plate can be disposed on the inner wall of the upper slide rail 202, the abutment plate being perpendicular to the axial direction of the lead screw 6, and the two ends of the elastic reset member 4 can abut against the abutment plate and the drive bracket 2 along the axial direction of the lead screw 6.

[0068] In other embodiments, a plurality of circumferentially spaced stop protrusions may be provided on the inner wall of the worm gear 7, the stop protrusions extending along the axial direction of the worm gear 7, and the aforementioned keyway is formed between any two adjacent stop protrusions.

[0069] In other embodiments, three or four or more sub-threaded components may be provided, depending on the actual situation.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A seat slide adjustment device, characterized by, The power device (100), transmission mechanism (300) and slide rail (200) are included, the slide rail (200) includes the lower slide rail (201) and the upper slide rail (202) supported on the lower slide rail (201), the transmission mechanism (300) includes the cable (3), worm gear (7), worm (1), detachable screw (5), screw rod (6) and drive bracket (2), the screw rod (6) is fixed in the lower slide rail (201), the screw rod (6) passes through the worm gear (7) and detachable screw (5) along its axial direction;The power device (100) and worm (1) are installed on the upper slide rail (202), and the output shaft of the power device (100) is connected with the worm (1); The detachable screw (5) is axially fixed relative to the upper slide rail (202), and the detachable screw (5) is provided with an internal threaded hole, the outer wall of the detachable screw (5) is provided with a first locking structure, the detachable screw (5) includes at least two sub-screws which can be combined into a complete screw in the circumferential direction, the detachable screw (5) has a clamping end and an opening end, and an elastic ring is sleeved on the outer peripheral surface of the clamping end for clamping the plurality of sub-screws; The drive bracket (2) is installed on the upper slide rail (202), one end of the cable (3) is fixed on the drive bracket (2), which is used for pulling the drive bracket (2) to move along the axial direction of the screw rod (6), and the elastic reset member (4) is arranged between the cable (3) and the upper slide rail (202);The drive bracket (2) has a mounting portion and a separation portion which are spaced apart along the axial direction of the screw rod (6), the detachable screw (5) is located between the mounting portion and the separation portion, the worm gear (7) is rotatably installed on the mounting portion, the worm gear (7) is axially fixed relative to the mounting portion, the worm gear (7) is provided with a mounting hole penetrating along its axial direction, and the inner wall of the worm gear (7) is provided with a second locking structure for circumferential blocking cooperation with the first locking mechanism, and the detachable screw (5) can be inserted into the mounting hole and threadedly connected with the screw rod (6) when the sub-screws are clamped; The separation portion is provided with a tapered structure (23) on the side towards the opening end, the tapered structure (23) gradually shrinks to the radial inner side in the process of approaching the opening end, and the tapered structure (23) can be inserted into the internal threaded hole of the opening end to make the sub-screws overcome the elastic ring and separate from the screw rod (6) to the radial outer side.

2. The seat rail adjustment device of claim 1, wherein, The opening of the internal threaded hole at the opening end is an expanding opening (53), and the expanding opening (53) gradually tilts to the radial outer side in the process of moving away from the clamping end, so as to guide the tapered structure (23) to be inserted into the internal threaded hole.

3. The seat rail adjustment device of claim 2, wherein, The tapered structure (23) is a tapered rotary body rotating around the axis of the screw rod (6), the tapered rotary body is provided with a central hole penetrating along the axial direction of the screw rod (6), and the screw rod (6) passes through the central hole.

4. The seat rail adjustment device of claim 3, wherein, The driving support (2) comprises a mounting support (21) and a separation support (22), the separation support (22) is detachably connected with the mounting support (21), the worm gear (7) is rotatably mounted on the mounting support (21), and the conical rotary body is arranged on the separation support (22).

5. The seat rail adjustment device of claim 4, wherein, The mounting support (21) comprises a mounting plate and a cantilever, the mounting plate extends along a direction perpendicular to an axis of the lead screw (6), the cantilever is formed by extending an upper end of the mounting plate to a side close to the separation support (22), the separation support (22) is detachably connected with an end of the cantilever, the mounting plate is provided with a limiting hole penetrating through in an axial direction of the lead screw (6), and the outer wall of the end of the worm gear (7) is provided with a circumferential groove, the mounting plate is sleeved on the worm gear (7) and clamped into the circumferential groove.

6. The seat rail adjustment device of any one of claims 1-5, wherein, Further comprising a fixing support (8) fixed on the upper slide rail (202), the fixing support (8) is located between the mounting part and the separation part, the fixing support (8) is provided with a limiting groove, the outer wall of the opening end of the separable screw part (5) is protruded to a radial outer side to form a flange (51), the flange (51) is clamped into the limiting groove, and the fixing support (8) is in abutting fit with the flange (51) in the axial direction of the lead screw (6).

7. The seat rail adjustment device of claim 6, wherein, The fixing support (8) comprises a first fixing plate (81) and a second fixing plate (82), the first fixing plate (81) and the second fixing plate (82) are spaced apart in the axial direction of the lead screw (6) to form the limiting groove, and the first fixing plate (81) and the second fixing plate (82) are provided with a through hole for the lead screw (6) to pass through, and the diameter of the through hole is greater than the outer diameter of the widest part of the conical structure (23).

8. The seat rail adjustment apparatus of claim 6, wherein, The upper end of the fixing support (8) and the separation part protrudes upwardly from the upper slide rail (202), one end of the cable (3) is fixed on the separation part, and the elastic return member (4) is arranged between the fixing support (8) and the separation part.

9. The seat rail adjustment device of any one of claims 1-5, wherein, The inner wall of the worm gear (7) is provided with a plurality of key grooves, the plurality of key grooves are spaced apart in a circumferential direction of the worm gear (7) and penetrate through in an axial direction of the worm gear (7), the key grooves form a first abutting structure, the outer wall of the separable screw part (5) is provided with a corresponding abutting key, the plurality of abutting keys are spaced apart in a circumferential direction of the lead screw (6) and extend in an axial direction of the lead screw (6), the abutting key forms a second abutting structure, and the abutting key can be arranged in the corresponding key groove when the separable screw part (5) penetrates into the mounting hole.

10. The seat rail adjustment device of any one of claims 1-5, wherein, The separable screw part (5) comprises a first sub-screw part and a second sub-screw part, the first sub-screw part and the second sub-screw part are both half screw parts, the first sub-screw part is provided with a first sub-thread hole in a half cylindrical shape extending in an axial direction of the first sub-screw part, and the second sub-screw part is provided with a second sub-thread hole in a half cylindrical shape extending in an axial direction of the second sub-screw part. The first and second sub-threaded holes enclose the inner threaded hole when the first and second sub-threaded members are clamped, and the first and second sub-threaded members can move away from each other in a direction perpendicular to the axis of the screw rod (6) when the tapered structure (23) is inserted into the inner threaded hole to disengage the screw rod (6).

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