A seat height adjuster and a seat height adjustment device
By adding a metal retaining ring and a limiting protrusion to the seat height adjuster, the problem of the seat height adjuster housing being prone to cracking under load is solved, thereby improving strength and durability and enhancing passenger safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUBEI AVIATION PRECISION MASCH TECH CO LTD
- Filing Date
- 2022-06-15
- Publication Date
- 2026-05-12
AI Technical Summary
Existing seat height adjuster housings are prone to cracking and failure under impact loads or high-torque static loads, posing a safety hazard, and have low strength.
A metal retaining ring is added to the seat height adjuster. The movement of the slider is restricted by the cooperation of the limiting protrusion and the stop. The load is borne by the plastic outer shell and the metal retaining ring, which avoids stress concentration and crush failure.
The strength and durability of the seat height adjuster have been improved, enhancing passenger safety, preventing shell breakage and failure, and improving passenger comfort and safety.
Smart Images
Figure CN114851925B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of seating technology, and more specifically to a seat height adjuster and a seat height adjustment device. Background Technology
[0002] The height adjustment function of car seats can provide a comfortable riding experience for different users, and the seat height adjuster is used to realize the height adjustment of the seat. In the existing technology, the seat height adjuster housing is made of plastic material, which has the advantages of low cost, lightweight and low noise.
[0003] However, the strength of the seat height adjuster housing in this design is relatively low. It will break and fail when subjected to impact loads or high torque static loads of about 200 Nm, posing a significant threat to passenger safety. Summary of the Invention
[0004] The purpose of this invention is to provide a seat height adjuster that avoids stress concentration and crush failure in the outer shell, improves the strength and durability of the product, and enhances the safety of seat use.
[0005] To solve the above-mentioned technical problems, the present invention provides a seat height adjuster, including a deceleration unit and a housing. The deceleration unit includes a slider, which has two opposing limiting protrusions in a first direction. The housing has a first mounting groove inside. In the installed state, the slider is located in the first mounting groove and can only move in the first direction within the first mounting groove. The housing is made of plastic material.
[0006] It also includes a metal retaining ring. The outer shell has a second mounting groove at the opening end of the first mounting groove. The metal retaining ring has a stop at both ends in the first direction. The metal retaining ring is fixedly installed in the second mounting groove and partially overlaps with the slider in the depth direction. The stop is used to limit the movement of the corresponding limiting protrusion in the second direction. The first direction and the second direction are perpendicular to each other.
[0007] This invention relates to a seat height adjuster, which incorporates a metal retaining ring to limit the movement of a corresponding limiting protrusion in the second direction. When the load is large, the outer shell deforms until it abuts against the limiting protrusion and the stop. The load is borne jointly by the plastic outer shell and the metal retaining ring, preventing the outer shell from cracking due to excessive load. At the same time, the metal retaining ring is a ring-shaped structure and is installed inside the outer shell, increasing the contact area with the outer shell and preventing stress concentration and crushing failure of the outer shell. This improves the strength and durability of the product and enhances the safety of seat use.
[0008] Optionally, the metal retaining ring protrudes outward at both ends in the first direction and forms a limiting groove inside. The limiting protrusion is inserted into the limiting groove. There is a preset gap between the limiting protrusion and the corresponding sidewall of the limiting groove in the second direction. The protrusion is the retaining part.
[0009] Optionally, the metal retaining ring protrudes inward at both ends in the first direction, the limiting protrusion is provided with an outer end opening and a notch extending along the first direction, the protrusion is inserted into the notch, and there is a preset gap between the protrusion and the corresponding sidewall of the notch in the second direction, the protrusion being the retaining part.
[0010] Optionally, the second mounting groove is interference-fitted with the metal retaining ring.
[0011] Optionally, the metal retaining ring and the slider have the same thickness.
[0012] Optionally, the slider protrudes outward at both ends in the second direction and forms a limiting groove inside, and the metal retaining ring protrudes outward at both ends in the second direction and forms a receiving groove inside.
[0013] When the limiting protrusion is inserted into the receiving groove, the two protrusions at both ends of the slider in the second direction can be located between the inner walls of the metal retaining ring.
[0014] Optionally, the distance between the outer end walls of the limiting protrusions at both ends of the slider in the first direction is not greater than the distance between the inner end walls of the receiving grooves at both ends of the metal retaining ring in the second direction.
[0015] The width of the limiting protrusion is not greater than the width of the receiving groove.
[0016] The distance between the outer end walls of the two protrusions at the two ends of the slider in the second direction is not greater than the inner diameter of the metal retaining ring.
[0017] Optionally, the slider protrudes outward at both ends in the second direction and forms a limiting groove inside; the metal retaining ring protrudes outward at both ends in the second direction and forms a receiving groove inside; the limiting groove has a first notch at its opening end, and the receiving groove has a second notch at its opening end; in the working state, the protrusion of the metal retaining ring in the second direction is located within the second notch.
[0018] When the limiting protrusion is inserted into the receiving groove, the two protrusions at both ends of the slider in the second direction can be located inside the corresponding first notch.
[0019] Optionally, the distance between the outer end walls of the limiting protrusions at both ends of the slider in the first direction is not greater than the distance between the inner end walls of the receiving grooves at both ends of the metal retaining ring in the second direction.
[0020] The width of the limiting protrusion is not greater than the width of the receiving groove.
[0021] The width of the protrusions at both ends of the slider in the second direction is not greater than the width of the first notch, and the distance between the outer end walls of the protrusions at both ends of the slider in the second direction is not greater than the minimum distance between the inner end walls of the first notch at both ends within the width range of the protrusions.
[0022] The present invention also provides a seat height adjustment device, including a linkage mechanism disposed on both sides of the seat and the aforementioned seat height adjuster, wherein the seat height adjuster is used to drive the linkage mechanism to rise and fall, thereby driving the seat to rise and fall.
[0023] The seat height adjustment device of the present invention includes the aforementioned seat height adjuster, and therefore has the same technical effect as the aforementioned seat height adjuster, which will not be described again here. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of a specific embodiment of the seat height adjuster provided by the present invention;
[0025] Figure 2 for Figure 1 A split diagram;
[0026] Figure 3 for Figure 1 A structural diagram from another angle;
[0027] Figure 4 for Figure 1 A schematic diagram of the structure of the seat height adjuster when the slider and metal retaining ring are installed inside the outer casing;
[0028] Figure 5 for Figure 4 Top view;
[0029] Figure 6 for Figure 4 A schematic diagram of the structure cut along the first direction;
[0030] Figure 7 for Figure 4 A split diagram;
[0031] Figure 8 for Figure 4 Schematic diagram of the structure of the metal retaining ring;
[0032] Figure 9 for Figure 4 The first layout diagram for machining the middle slider and metal retaining ring;
[0033] Figure 10 for Figure 4 The second layout diagram for machining the middle slider and metal retaining ring;
[0034] Figure 11 for Figure 1 A schematic diagram of the second structure of the middle slider and metal retaining ring in the installed state;
[0035] Figure 12 for Figure 11 Layout diagram for machining the middle slider and metal retaining ring;
[0036] in, Figures 1-12 The annotations in the accompanying drawings are explained as follows:
[0037] 1-Output gear;
[0038] 2-Outer casing; 2a-First mounting slot; 2b-Second mounting slot;
[0039] 3-Outer shell cover;
[0040] 4-Output shaft;
[0041] 511-Worn gear; 521-Drive shaft; 522-Slider; 522a-Limiting protrusion; 522b-Limiting groove; 523-Planetary internal gear; 524-Planetary external gear; 524a-Protrusion;
[0042] 6-Bushing;
[0043] 7-Metal retaining ring; 7a-Limiting groove; 7b-Receiving groove.
[0044] 8-Limit sleeve;
[0045] 9-Screw. Detailed Implementation
[0046] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0047] The terms "first" and "second" used in this article are used only for the convenience of describing two or more structures or components that are identical or similar in structure and / or function, and do not indicate any special limitation on order and / or importance.
[0048] In this article, the sidewalls of the outer shell 2 and the outer shell cover 3 that are opposite each other are referred to as the "inner walls".
[0049] Please refer to Figures 1-3 , Figure 1 This is a schematic diagram of a specific embodiment of the seat height adjuster provided by the present invention; Figure 2 for Figure 1 A split diagram; Figure 3 for Figure 1 A structural diagram from another angle.
[0050] This invention provides a seat height adjuster for driving the linkage mechanisms on both sides of the seat to rise and fall, thereby raising and lowering the seat and realizing the position adjustment of the seat in the height direction.
[0051] The seat height adjuster specifically includes a drive motor, a reduction unit, and an output gear 1 connected in sequence, as well as an outer shell 2 and an outer shell cover 3. The outer shell cover 3 is fixed to the side panel of the seat to fix the seat height adjuster. The outer shell 2 and the outer shell cover 3 are fixed together by screws 9, and the two enclose each other to form an accommodating space. The reduction unit is arranged in the accommodating space, and the drive motor is fixed to the outside of the outer shell 2.
[0052] The drive motor includes a motor shaft, which serves as the input shaft of the reduction unit. It also includes an output shaft 4, which is arranged perpendicular to the motor's output shaft. The first end of the output shaft 4 engages with a hole in the outer casing 2, and the second end extends through the outer casing cover 3 and is secured by a limiting sleeve 8. The reduction unit includes a worm gear reduction mechanism and a low-tooth-difference reduction mechanism. The worm in the worm gear reduction mechanism is fixedly connected to the motor shaft, allowing it to rotate under the drive of the motor shaft. The worm wheel 511 in the worm gear reduction mechanism is rotatably mounted on the output shaft 4, enabling it to rotate axially around the output shaft 4 under the drive of the worm, thus achieving a single-stage reduction.
[0053] The low-tooth-difference reduction mechanism specifically includes a drive shaft 521, a slider 522, a planetary internal gear 523, and a planetary external gear 524. The drive shaft 521 is fixed to the end of the worm gear 511 facing away from the drive motor, and the drive shaft 521 and the worm gear 511 are eccentrically set. The eccentricity is equal to the eccentricity required by the low-tooth-difference mechanism. The output shaft 4 passes through the drive shaft 521, and the output shaft 4 and the drive shaft 521 are not concentric. Thus, when the worm gear 511 rotates, the axis of the drive shaft 521 will make a circular motion with the axis of the output shaft 4 as the center and the eccentricity as the radius.
[0054] The slider 522 is located between the planetary external gear 524 and the worm gear 511 and has an annular structure. Its outer peripheral wall has two opposing limiting protrusions 522a in the first direction and protrudes outward in the second direction to form two opposing limiting grooves 522b. The first direction and the second direction are perpendicular to each other. The outer shell 2 has a first mounting groove 2a that matches the slider 522. In the installed state, the output shaft 4 passes through the inside of the slider 522 and the slider 522 is installed in the first mounting groove 2a. The mounting groove 2a limits the slider 522 circumferentially, and the slider 522 can only move in the first direction.
[0055] The planetary external gear 524 has a central hole in the middle for the drive shaft 521 to pass through. The side wall of the planetary external gear 524 facing the slider 522 is also provided with two protrusions 524a. The protrusions 524a and the limiting grooves 522b on the inner peripheral wall of the slider 522 are matched one-to-one. The external teeth of the planetary external gear 524 are matched with the internal teeth of the planetary internal gear 523. The planetary internal gear 523 is rotatably mounted on the output shaft 4 and placed in the internal groove of the outer casing 3.
[0056] Thus, the protrusion 524a and the limiting groove 522b cooperate to play a circumferential limiting role, so that the planetary external gear 524 can only slide relative to the slider 522 along the extension direction of the limiting groove 522b, that is, along the second direction, and cannot rotate. Since the slider 522 can slide in the first direction, the planetary external gear 524 can make a circular motion under the drive of the drive shaft 521, and always mesh with the planetary internal gear 523, thereby driving the planetary internal gear 523 to rotate, realizing two-stage deceleration.
[0057] The output gear 1 is fixedly connected to the planetary internal gear 523, passes through the bushing 6, and extends out from the outer cover 3 to mesh with the gear plate on the seat, thereby transmitting power to the linkage mechanism to realize the lifting and lowering of the seat.
[0058] In summary, the power transmission process of the seat height adjuster of the present invention is as follows:
[0059] The motor shaft of the drive motor rotates, which drives the worm to rotate synchronously. Since the worm meshes with the worm wheel 511, the power is transmitted to the worm wheel 511 to achieve first-stage reduction.
[0060] Since the drive shaft 521 and the worm gear 511 are fixed together and are eccentrically set, the drive shaft 521 makes a circular motion, which drives the planetary external gear 524 to make a circular motion. Since the planetary external gear 524 is always meshed with the planetary internal gear 523, it drives the planetary internal gear 523 to rotate, thus achieving two-stage reduction.
[0061] The planetary internal gear 523 is fixedly connected to the output gear 1, thus transmitting power to the output gear 1 and driving the output gear 1 to rotate.
[0062] It is understandable that the impact load or high torque static load (about 200 Nm) from the seat will inevitably be transmitted from the output gear 1 to the slider 522. The slider 522 is subjected to force and moves (moves or rotates) in the second direction. The force is transmitted from the two limiting protrusions 522a of the slider 522 to the housing 2. For cost, weight reduction and noise considerations, the housing 2 is usually made of plastic. Therefore, the housing 2 may crack and fail, which poses a significant threat to the safety of passengers.
[0063] Based on this, please refer to Figures 4-8 , Figure 4 for Figure 1 A schematic diagram of the structure of the seat height adjuster when the slider and metal retaining ring are installed inside the outer casing; Figure 5 for Figure 4 Top view; Figure 6 for Figure 4 A schematic diagram of the structure cut along the first direction; Figure 7 for Figure 4 A split diagram; Figure 8 for Figure 4 A schematic diagram of the structure of the metal retaining ring.
[0064] The seat height adjuster of the present invention also includes a metal retaining ring 7. A second mounting groove 2b is provided inside the outer shell 2 at the opening end of the first mounting groove 2a. The metal retaining ring 7 protrudes outward at both ends in the first direction and forms a limiting groove 7a inside. The metal retaining ring 7 is fixedly installed in the second mounting groove 2b and partially overlaps with the slider 522 in the depth direction. The limiting protrusion 522a is partially inserted into the limiting groove 7a. There is a preset gap between the limiting protrusion 522a and the corresponding side wall of the limiting groove 7a in the second direction, which is used to limit the movement of the limiting protrusion 522a in the second direction.
[0065] Combination Figure 6 Understand that the "depth direction" mentioned here refers to the thickness direction of the metal retaining ring 7 and the slider 522.
[0066] The “preset gap” mentioned here is set as follows: when the load on the outer shell 2 reaches the preset value (lower than the load when the outer shell 2 breaks and fails), the outer shell 2 deforms until the limiting groove 7a abuts against the corresponding side wall of the limiting protrusion 522a in the second direction, and the load is borne by the metal retaining ring 7 and the outer shell 2 together.
[0067] In this invention, the seat height adjuster has the following characteristics: When the load is small, there is a gap between the limiting groove 7a and the corresponding side wall of the limiting protrusion 522a in the second direction, and the load is borne only by the plastic outer shell 2, ensuring smooth seat height adjustment operation, reducing noise, and improving seat comfort. When the load is large, the outer shell 2 deforms until the limiting groove 7a abuts against the corresponding side wall of the limiting protrusion 522a, and the load is borne jointly by the plastic outer shell 2 and the metal retaining ring 7, preventing the outer shell 2 from cracking due to excessive load. At the same time, the metal retaining ring 7 has a ring structure and is installed inside the outer shell 2, increasing the contact area with the outer shell 2, preventing stress concentration and crushing failure of the outer shell 2, improving the strength and durability of the product, and enhancing seat safety.
[0068] It can be understood that as long as the metal retaining ring 7 can limit the movement of the limiting protrusion 522a in the second direction, the structure of the metal retaining ring 7 is not limited to the above embodiments. For example, both ends of the metal retaining ring 7 in the first direction can also protrude inward. The limiting protrusion 522a is provided with an outer end opening and a notch extending in the first direction. The protrusion is inserted into the notch, and there is a preset gap between the corresponding side walls of the protrusion and the notch in the second direction.
[0069] In this embodiment, the second mounting groove 2b and the metal retaining ring 7 are in interference fit, and the elastic deformation of the plastic material of the outer housing 2 is utilized to reduce the requirement for assembly accuracy.
[0070] In addition, the metal retaining ring 7 and the slider 522 have the same thickness. Therefore, the metal retaining ring 7 and the slider 522 can be formed from the same sheet material, which is convenient for processing.
[0071] In order to further save sheet material and reduce processing costs, the structures of the metal retaining ring 7 and the slider 522 can be improved, and the processing can be completed by using the nested punching process.
[0072] Please refer to Figures 9-10 , Figure 9 For Figure 4 the first layout drawing during the processing of the slider and the metal retaining ring in Figure 10 For Figure 4 the second layout drawing during the processing of the slider and the metal retaining ring in
[0073] In the present invention, both ends of the slider 522 protrude outward in the second direction and a limiting groove 522b is formed inside. Both ends of the metal retaining ring 7 protrude outward in the second direction and a receiving groove 7b is formed inside.
[0074] The distance e between the outer end walls of the limiting protrusions 522a at both ends of the slider 522 in the first direction is not greater than the distance f between the inner end walls of the receiving grooves 7b at both ends of the metal retaining ring 7 in the second direction. Specifically, the distance between the outer end walls of the limiting protrusions 522a at both ends of the slider 522 in the first direction is less than the distance between the inner end walls of the receiving grooves 7b at both ends of the metal retaining ring 7 in the second direction, e < f, as Figure 9 shown; or, the distance e between the outer end walls of the limiting protrusions 522a at both ends of the slider 522 in the first direction is equal to the distance f between the inner end walls of the receiving grooves 7b at both ends of the metal retaining ring 7 in the second direction, e = f, as Figure 10 shown;
[0075] The width c of the limiting protrusion 522a is not greater than the width d of the receiving groove 7b;
[0076] The distance a between the outer end walls of the protrusions at both ends of the slider 522 in the second direction is not greater than the inner diameter b of the metal retaining ring 7.
[0077] In this way, during the processing, the metal retaining ring 7 and the slider 522 can adopt Figure 9 and Figure 10 Two layout methods are available, employing a punching process to save materials and reduce processing costs.
[0078] Please refer to Figures 11-12 , Figure 11 for Figure 1 A schematic diagram of the second structure of the middle slider and metal retaining ring in the installed state; Figure 12 for Figure 11 Layout diagram for machining the middle slider and metal retaining ring.
[0079] In this embodiment, the slider 522 protrudes outward at both ends in the second direction and forms a limiting groove 522b inside. The metal retaining ring 7 protrudes outward at both ends in the second direction and forms a receiving groove 7b inside. The opening end of the limiting groove 7a is provided with a first notch 7c, and the opening end of the receiving groove 7b is provided with a second notch 7d. In the working state, the protrusions of the metal retaining ring 7 in the second direction are located within the second notch 7d. Figure 11 As shown.
[0080] Simultaneously, when the limiting protrusion 522a is inserted into the receiving groove 7b, the two protrusions at both ends of the slider 522 in the second direction can also be located inside the corresponding first notch 7c. Specifically, as Figure 12 As shown, the distance e between the outer end walls of the limiting protrusions 522a at both ends of the slider 522 in the first direction is not greater than the distance f between the inner end walls of the receiving grooves 7b at both ends of the metal retaining ring 7 in the second direction.
[0081] The width c of the limiting protrusion 522a is not greater than the width d of the receiving groove 7b.
[0082] The width of the protrusion h at both ends of the slider 522 in the second direction is not greater than the width i of the first notch 7c, and the distance a between the outer end walls of the protrusions at both ends of the slider 522 in the second direction is not greater than the minimum distance g between the inner end walls of the first notch 7c at both ends within the width range of the protrusion.
[0083] Thus, during the processing, the metal retaining ring 7 and the slider 522 can be used... Figure 12 The nesting method uses a punching process, which saves materials and reduces costs.
[0084] In this embodiment, the inner end wall of the first notch 7c is arc-shaped. It can be understood that the inner end wall of the first notch 7c can also be a plane. In this case, the distance a between the outer end walls of the two protrusions at the two ends of the slider 522 in the second direction should not be greater than the distance between the inner end walls of the two ends of the first notch 7c.
[0085] The present invention also provides a seat height adjustment device, including a linkage mechanism disposed on both sides of the seat, and the aforementioned seat height adjuster, wherein the seat height adjuster is used to drive the linkage mechanism to lift and lower, thereby driving the seat to lift and lower.
[0086] The seat height adjustment device of the present invention includes the aforementioned seat height adjuster, and therefore has the same technical effect as the aforementioned seat height adjuster, which will not be described again here.
[0087] The above provides a detailed description of the seat height adjuster and seat height adjustment device provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
Claims
1. A seat height adjuster, characterized in that, The device includes a deceleration unit and a housing (2). The deceleration unit includes a slider (522). The slider (522) has two opposing limiting protrusions (522a) in a first direction. The housing (2) has a first mounting groove (2a) inside. In the installed state, the slider (522) is located in the first mounting groove (2a) and can only move in the first direction within the first mounting groove (2a). The housing (2) is made of plastic material. It also includes a metal retaining ring (7). The outer shell (2) has a second mounting groove (2b) at the opening end of the first mounting groove (2a). The metal retaining ring (7) has a stop at both ends in the first direction. The metal retaining ring (7) is fixedly installed in the second mounting groove (2b) and partially coincides with the slider (522) in the depth direction. The stop is used to limit the movement of the corresponding limiting protrusion (522a) in the second direction. The first direction and the second direction are perpendicular to each other.
2. The seat height adjuster according to claim 1, characterized in that, The metal retaining ring (7) protrudes outward at both ends in the first direction and forms a limiting groove (7a) inside. The limiting protrusion (522a) is partially inserted into the limiting groove (7a). There is a preset gap between the limiting protrusion (522a) and the corresponding side wall of the limiting groove (7a) in the second direction. The protrusion is the retaining part.
3. The seat height adjuster according to claim 1, characterized in that, The metal retaining ring (7) protrudes inward at both ends in the first direction. The limiting protrusion (522a) is provided with an outer end opening and a notch extending in the first direction. The protrusion is inserted into the notch. There is a preset gap between the protrusion and the corresponding side wall of the notch in the second direction. The protrusion is the retaining part.
4. The seat height adjuster according to any one of claims 1-3, characterized in that, The second mounting groove (2b) is interference-fitted with the metal retaining ring (7).
5. The seat height adjuster according to claim 2, characterized in that, The metal retaining ring (7) and the slider (522) have the same thickness.
6. The seat height adjuster according to claim 5, characterized in that, The slider (522) protrudes outward at both ends in the second direction and forms a limiting groove (522b) inside. The metal retaining ring (7) protrudes outward at both ends in the second direction and forms a receiving groove (7b) inside. The limiting protrusion (522a) can be inserted into the receiving groove (7b), and the two protrusions at both ends of the slider (522) in the second direction can be located between the inner walls of the metal retaining ring (7).
7. The seat height adjuster according to claim 6, characterized in that, The distance between the outer end walls of the limiting protrusions (522a) at both ends of the slider (522) in the first direction is not greater than the distance between the inner end walls of the receiving grooves (7b) at both ends of the metal retaining ring (7) in the second direction. The width of the limiting protrusion (522a) is not greater than the width of the receiving groove (7b). The distance between the outer end walls of the two protrusions at the second direction of the slider (522) is not greater than the inner diameter of the metal retaining ring (7).
8. The seat height adjuster according to claim 5, characterized in that, The slider (522) protrudes outward at both ends in the second direction and forms a limiting groove (522b) inside. The metal retaining ring (7) protrudes outward at both ends in the second direction and forms a receiving groove (7b) inside. The opening end of the limiting groove (7a) is provided with a first notch (7c), and the opening end of the receiving groove (7b) is provided with a second notch (7d). In the working state, the protrusion of the metal retaining ring (7) in the second direction is located in the second notch (7d). The limiting protrusion (522a) can also be inserted into the receiving groove (7b), and the two protrusions at both ends of the slider (522) in the second direction can be located inside the corresponding first notch (7c).
9. The seat height adjuster according to claim 8, characterized in that, The distance between the outer end walls of the limiting protrusions (522a) at both ends of the slider (522) in the first direction is not greater than the distance between the inner end walls of the receiving grooves (7b) at both ends of the metal retaining ring (7) in the second direction. The width of the limiting protrusion (522a) is not greater than the width of the receiving groove (7b). The width of the protrusions at both ends of the slider (522) in the second direction is not greater than the width of the first notch (7c), and the distance between the outer end walls of the protrusions at both ends of the slider (522) in the second direction is not greater than the minimum distance between the inner end walls of the first notch (7c) at both ends within the width range of the protrusions.
10. A seat height adjustment device, characterized in that, The seat includes a linkage mechanism disposed on both sides of the seat, and a seat height adjuster as described in any one of claims 1-9, wherein the seat height adjuster is used to drive the linkage mechanism to raise or lower, thereby driving the seat to raise or lower.