CN217347562U - Locking mechanism and seat height adjuster - Google Patents

Abstract

The application discloses locking mechanism and seat heightening device, locking mechanism includes: the locking mechanism comprises a rotating piece, a fixing assembly and a locking piece, wherein the fixing assembly is sleeved outside the rotating piece, a wedge-shaped cavity is formed between the fixing assembly and the rotating piece, and the locking piece is arranged in the wedge-shaped cavity and can rotate along the circumferential direction of the rotating piece to move to a locking position or an unlocking position; the fixing component comprises an outer shell and a sleeve body connected with the outer shell, and the sleeve body comprises a plurality of layers of laminated bodies which are sequentially laminated along the axial direction. According to the locking mechanism, in the locking process and the unlocking process, the deformation degree of the fixed assembly is smaller, so that the space-time stroke is small when the rotating member is operated to rotate, and the neutral gear feeling is weak. Moreover, the existing parts and interfaces of the existing seat height adjuster can be maximized, so that the seat height adjuster has the advantages of low modification cost and good universality.

Description

Locking mechanism and seat height adjuster

Technical Field

The application relates to the technical field of machinery, in particular to a locking mechanism and a seat height adjuster comprising the same.

Background

Some seats, such as car seats, are equipped with seat risers for adjusting the height of the seat. A typical seat height adjuster (such as the seat height adjuster of patent No. CN 110395150A) includes an operating mechanism to which an external force is applied, a locking mechanism, and an output mechanism, wherein the operating mechanism rotates a rotating member of the locking mechanism, and the rotating member is transmitted to the seat via the output mechanism, and is converted into a movement in the seat height direction. When the seat is adjusted to the target height, the locking member of the locking mechanism locks the rotating member of the seat to prevent the rotating member from rotating, thereby stabilizing the seat at the target height. When the operating mechanism drives the rotating part of the locking mechanism to rotate, the seat height adjuster in the patent number CN110395150A has a large neutral gear stroke and a remarkable neutral gear feeling.

SUMMERY OF THE UTILITY MODEL

In one aspect, the present application provides a locking mechanism comprising: the locking mechanism comprises a rotating piece, a fixed assembly and a locking piece, wherein the fixed assembly is sleeved outside the rotating piece, a wedge-shaped cavity is formed between the fixed assembly and the rotating piece, and the locking piece is arranged in the wedge-shaped cavity and can rotate along the circumferential direction along with the rotating piece to move to a locking position or an unlocking position; the fixing component comprises an outer shell and a sleeve body connected with the outer shell.

In one embodiment of the locking mechanism, the sleeve body is an integral structure; or the sleeve body comprises a plurality of layers of laminated bodies which are sequentially laminated along the axial direction, the first layer of laminated body which is closest to the end wall of the outer shell is fixed in position relative to the outer shell in the axial direction and the circumferential direction, and the laminated bodies in each layer are mutually limited in the circumferential direction and mutually free in the axial direction through mutual embedding of a concave part and a convex part which are arranged on the end surface.

In one embodiment of the locking mechanism, the stacked bodies have the same structure, and each of the stacked bodies has a concave portion on one end face and a convex portion on the other end face.

In one embodiment of the lock mechanism, the end wall of the housing is provided with a concave portion or a convex portion for fitting with the convex portion or the concave portion of the first laminated body.

In one embodiment of the locking mechanism, the first laminated body is welded with the housing, and a welding seam is positioned inside the housing or on the outer peripheral surface of the housing; or the first laminated body is connected with the side wall of the shell in an interference riveting mode.

In one embodiment of the locking mechanism, the outer circumferential surface of the rotating member has a flat region, and the wedge-shaped cavity is formed between the flat region and the inner circumferential surface of the fixed component when the rotating member rotates to any position along the circumferential direction.

In one embodiment of the locking mechanism, a plurality of wedge-shaped cavities are sequentially formed along the circumferential direction, wherein the wedge-shaped cavities include at least one first wedge-shaped cavity and at least one second wedge-shaped cavity, the distance between the inner cavity wall and the outer cavity wall of the first wedge-shaped cavity is gradually reduced along the clockwise circumferential direction, the distance between the inner cavity wall and the outer cavity wall of the second wedge-shaped cavity is gradually reduced along the counterclockwise circumferential direction, and at least one locking piece is installed in each wedge-shaped cavity; when the number of the first wedge cavities and the number of the second wedge cavities are also multiple, the first wedge cavities and the second wedge cavities are alternately arranged one by one along the circumferential direction.

In an embodiment of the locking mechanism, the locking mechanism further comprises an abutting member, and the abutting member comprises:

the first pushing part is used for pushing the rotating part to rotate along the circumferential direction;

the second pushing part is used for pushing the locking piece to move from the locking position to the unlocking position and pushing the locking piece and the rotating piece to rotate together along the circumferential direction;

when the second abutting portion contacts the locking piece located at the locking position, a circumferential gap is formed between the first abutting portion and the rotating piece, and the circumferential length of the circumferential gap is not smaller than the circumferential stroke of the locking piece from the locking position to the unlocking position.

In an embodiment of the locking mechanism, the locking mechanism further includes an elastic member, and the elastic member (disposed between the rotating member and the fixing member, and the locking member is capable of returning from the unlocking position to the locking position by means of an elastic force of the elastic member.

In another aspect, the present application provides a seat height adjuster, including any one of the above locking mechanisms, further including an output mechanism, a connecting mechanism, and an operating mechanism; the connecting mechanism connects the locking mechanism, the output mechanism and the operating mechanism together in a penetrating way; the operating mechanism is in transmission connection with the locking mechanism and can drive the rotating part to rotate; the rotating part of the locking mechanism is in transmission connection with the output mechanism to drive the output mechanism to rotate, and the output mechanism is connected with the seat to drive the seat to lift.

The application provides a locking mechanism's idle stroke is short, and neutral gear feels unobvious during the operation. Moreover, no matter where the rotating part stops, the locking mechanism can be locked, and the locking mechanism is firm and not easy to loosen, and has few parts, simple and compact integral structure and small size.

Drawings

FIG. 1 is a schematic view of one embodiment of a seat riser provided herein;

FIG. 2 is an exploded view of a portion of the structure of FIG. 1;

FIG. 3 is an exploded view of the circled portion of FIG. 2;

FIG. 4 is an axial view of the circled portion of FIG. 2;

FIGS. 5 and 6 are schematic views of two welding methods for the housing and the first laminate, respectively;

fig. 7 and 8 are schematic views of two viewing angles of the rotating member, respectively.

The reference numerals are explained below:

10 a locking mechanism;

101a rotational member, 101a splines, 101b lands, 101c straight regions, 101d dimples;

102 fixing components, 1021 laminating bodies, 1021a convex columns, 1022 shells, 1022a jacks, 1022B flanged holes, 1022c flanged edges and B end walls;

103 a lock;

104 pushing piece, 1041 first pushing part, 1041a spline groove, 1042 second pushing part;

105 spring, 105a female, 105b male, s-helix axis;

a wedge-shaped cavity and H welding seam;

20 gear shafts, 20a grooves;

30 fixing the plate;

40 connecting mechanisms, 401 central shafts, 401a limiting flanges, 401b ring grooves and 402 limiting sleeves;

50 operating mechanism, 501 ratchet.

Detailed Description

In order to make those skilled in the art better understand the technical solutions of the present application, the following detailed description is made with reference to the accompanying drawings and the detailed description.

Referring to fig. 1-4, fig. 1 is a schematic view of one embodiment of a seat riser provided herein; FIG. 2 is an exploded view of a portion of the structure of FIG. 1; FIG. 3 is an exploded view of the circled portion of FIG. 2; fig. 4 is an axial view of the circled portion in fig. 2.

The locking mechanism 10 of the seat height adjuster includes a rotating member 101, a fixed member 102, and a locking member 103. The rotary member 101 is circumferentially rotatable about the rotation axis C.

The fixed assembly 102 is sleeved outside the rotating part 101 at intervals, a wedge-shaped cavity A is formed between the fixed assembly 102 and the rotating part 101, and the distance between the inner cavity wall and the outer cavity wall of the wedge-shaped cavity A is gradually reduced along the circumferential direction.

The locking member 103 is disposed in the wedge-shaped chamber a, and when the rotating member 101 rotates, the locking member 103 is driven to move circumferentially to a locking position or an unlocking position.

When the locking member 103 is located at the locking position, it is wedged tightly with the inner and outer cavity walls of the wedge cavity a, so that the rotating member 101 and the fixed member 102 are frictionally self-locked by the locking member 103, and at this time, the rotating member 101 cannot rotate in the circumferential direction. Because the distance between the inner cavity wall and the outer cavity wall of the wedge-shaped cavity A is gradually reduced along the circumferential direction, the tangent lines of the inner cavity wall and the outer cavity wall of the wedge-shaped cavity are not parallel but form a certain included angle, and due to the included angle, the self-locking condition of the rotating piece 101 and the fixed component 102 can be met as long as the friction coefficients of the locking piece 103, the rotating piece 101 and the fixed component 102 are reasonably matched on the basis. How to match the friction coefficient to satisfy the self-locking condition is well known to those skilled in the art and will not be described herein.

When the locking member 103 is located at the unlocking position, it is separated from at least one of the inner and outer cavity walls of the wedge cavity a, so that the rotating member 101 and the locking member 103 can rotate together in the circumferential direction.

The fixed component 102 includes an outer casing 1022 and a casing fixed together with the outer casing 1022, and both the outer casing 1022 and the casing are sleeved outside the rotating component 101. With this design, compared to the seat lifter in CN110395150A, the degree of deformation of the fixed member 102 is smaller during the locking process and the unlocking process, so that the idle stroke is reduced and the neutral feeling is reduced when the operating rotatable member 101 rotates. In addition, existing parts and interfaces of the seat height adjuster in CN110395150A can be utilized to the maximum extent, so that the seat height adjuster has the advantages of low modification cost and good universality.

The sleeve body can adopt an integrated structure and can be manufactured and molded through a cold extrusion process, fine blanking and powder metallurgy. As shown in the embodiment, the multi-layered structure 1021 may be formed by stacking a plurality of layered bodies in order in the axial direction.

The first laminated body 1021 closest to the end wall B of the housing 1022 is fixed in position axially and circumferentially with respect to the housing 1022. Specifically, the first laminated body 1021 and the outer shell 1022 may be welded, thereby achieving relative fixation of the axial and circumferential positions. The weld may be a butt end weld or a side penetration weld. When butt welded from the ends, as in fig. 5, weld H is located inside housing 1022. When penetration welding is performed from the side, as shown in fig. 6, the weld H is located on the outer side of the housing 1022. The first laminated body 1021 and the side wall of the outer shell 1022 may be in interference riveting connection, so as to achieve relative fixation of the axial and circumferential positions.

The laminated bodies 1021 in each layer are mutually circumferentially restrained and axially free by mutual engagement of concave and convex portions (convex columns 1021a in the figure) provided on the end surfaces. That is, any two adjacent layered products 1021, the concave portion of one fits into the convex portion of the other, and after the fitting, the relative positions of both are limited only in the circumferential direction, and the relative positions of both are not limited in the axial direction. The engagement of the concave and convex portions ensures the concentricity of the respective laminated bodies 1021. The higher the concentricity of the laminations 1021, the flatter the inner circumference of the fixation assembly 102 and the smoother the locking and unlocking process.

The first laminated body 1021 is axially and circumferentially fixed relative to the outer shell 1022, the laminated bodies 1021 are circumferentially limited and are axially free, and therefore the rotating torque can be uniformly dispersed to the laminated bodies 1021 in different layers, and the overall stress condition of the sleeve body is optimized.

Specifically, each of the stacked bodies 1021 may have a concave portion at one end surface and a convex portion at the other end surface, so that the stacked bodies 1021 may have the same structure while ensuring that the stacked bodies 1021 can be fitted to each other, thereby reducing the manufacturing cost and improving the interchangeability.

Specifically, the end wall of the outer case 1022 may be provided with a concave portion (insertion hole 1022a in the figure) or a convex portion for fitting with the convex portion or the concave portion of the first laminated body 1021. In this way, the circumferential relative position of the outer case 1022 and the first stacked body 1021 can be further defined, and the first stacked body 1021 can be positioned, thereby ensuring the concentricity of the first stacked body 1021 and the outer case 1022.

In the illustrated embodiment, the housing 1022 is further provided with a flanged hole 1022b and a flanged edge 1022c to enhance the structural strength of the housing 1022 and to provide a mounting base for the operating mechanism 50 and the gear shaft 20 (described in detail below).

Specifically, a straight area 101c is provided on the outer circumferential surface of the rotating member 101, and when the rotating member 101 rotates to any position along the circumferential direction, a wedge-shaped cavity a is formed between the straight area 101c and the inner circumferential surface of the fixed component 102. Since the wedge-shaped cavity a is formed between the straight region 101c of the rotating member 101 and the inner circumferential surface of the fixed component 102 when the rotating member 101 rotates to any position along the circumferential direction, the locking member 103 is always located in the wedge-shaped cavity a during the rotation of the locking member 103 together with the rotating member 101, and therefore the locking member 103 can lock the rotating member 101 no matter where it stops.

Specifically, at least one first flat region and at least one second flat region may be provided on the outer circumferential surface of the rotating member 101, the wedge-shaped cavity formed between the first flat region and the inner circumferential surface of the fixed member 102 is a first wedge-shaped cavity, and the wedge-shaped cavity formed between the first flat region and the inner circumferential surface of the fixed member 102 is a second wedge-shaped cavity. The distance between the inner cavity wall and the outer cavity wall of the first wedge-shaped cavity is gradually reduced along the clockwise circumferential direction, and the distance between the inner cavity wall and the outer cavity wall of the second wedge-shaped cavity is gradually reduced along the anticlockwise circumferential direction.

After the locking piece 103 in the first wedge-shaped cavity is wedged with the inner cavity wall and the outer cavity wall of the first wedge-shaped cavity, the rotating piece 101 cannot rotate clockwise, and after the locking piece 103 in the second wedge-shaped cavity is wedged with the inner cavity wall and the outer cavity wall of the second wedge-shaped cavity, the rotating piece 101 cannot rotate anticlockwise, so that the bidirectional locking of the rotating piece 101 is realized.

Specifically, the outer peripheral surface of the rotating member 101 may be provided with a plurality of first flat regions and a plurality of second flat regions, and each of the first flat regions and each of the second flat regions may be arranged alternately one by one at equal intervals in the circumferential direction, so that a plurality of first wedge cavities and a plurality of second wedge cavities may be formed in the circumferential direction, and each of the first wedge cavities and each of the second wedge cavities may be arranged alternately one by one in the circumferential direction. Thus, the gap between the rotating member 101 and the fixed member 102 can be fully utilized to realize locking at various positions around the entire circumference, and the locking is more reliable.

The outer peripheral surface of the rotor 101 may be designed as a tapered surface, such as a pentagonal prism surface in the illustrated embodiment. The inner circumferential surface of the stationary assembly 102 may be designed as a cylindrical surface whose central axis is collinear with the rotational axis C of the rotational member 101. In the illustrated embodiment, each of the five sides of the pentagonal prism surface is provided with a first flat region and a second flat region, so that a first wedge cavity and a second wedge cavity are formed between each of the five sides and the inner circumferential surface of the fixed component 102. Of course, the outer peripheral surface of the rotating member 101 and the inner peripheral surface of the fixed member 102 are not limited to the illustrated embodiment as long as: when the rotating member 101 rotates to any position in the circumferential direction, a wedge-shaped cavity is formed between the flat area and the inner circumferential surface of the fixed member 102.

The lock member 103 may be a cylinder, a ball, or the like, which is in point contact or line contact with the inner circumferential surface of the fixing member 102, and thus, it is advantageous to reduce the rotational resistance of the adaptor member 101 and the lock member 103.

Further, the locking mechanism 10 may further include an abutting member 104, and the abutting member 104 includes a first abutting portion 1041 and a second abutting portion 1042. The first pushing portion 1041 is used for pushing the rotating member 101 to rotate along the circumferential direction. The second pushing portion 1042 is used for pushing the locking member 103 to move from the locking position to the unlocking position and pushing the locking member 103 to rotate along the circumferential direction along with the rotating member 104.

The first pushing part 1041 and the second pushing part 1042 may be separately arranged. The first pushing portion 1041 and the second pushing portion 1042 may also be integrated into an integral structure to form an integral pushing member 104.

In the illustrated embodiment, the first pushing portion 1041 is a plate-shaped structure with a spline hole 1041a, and is sleeved on the outer periphery of the spline 101a of the rotating member 101 through the spline hole 1041 a. The second pushing portion 1042 is an arm-shaped structure extending along the rotation axis C, and has one end connected to the first pushing portion 1041 and the other end extending between the rotating member 101 and the fixed component 102. Of course, the structures of the first pushing portion 1041 and the second pushing portion 1042 are not limited thereto, as long as the pushing function can be realized.

The rotating member 101 can rotate in the circumferential direction only when the locking member 103 is located at the unlocking position, and therefore, the second pushing portion 1042 should push the locking member 103 to the unlocking position, and then the first pushing portion 1041 should push the rotating member 101 to rotate in the circumferential direction. When the first pushing portion 1041 and the second pushing portion 1042 are integrated into an integral structure, the sequential pushing sequence can be realized by setting a circumferential gap.

The circumferential gap is particularly set in such a way: when the pushing part 104 rotates to the first position along the first direction, the second pushing part 1042 just contacts the locking part 103 at the locking position, and at this time, a circumferential gap (for the illustrated embodiment, the circumferential gap is formed between the teeth of the spline hole 1041a and the teeth of the spline 101 a) is formed between the first pushing part 1041 and the rotating part 101, and the circumferential length of the circumferential gap is not less than the circumferential stroke of the locking part 103 moving from the locking position to the unlocking position.

When the pushing element 104 continues to rotate from the first position to the second position along the first direction, the circumferential gap between the first pushing portion 1041 and the rotating element 101 is completely eliminated (i.e. the first pushing portion 1041 just contacts the rotating element 101), and at this time, the locking element 103 is pushed by the second pushing portion 1042 to unlock the lock, which is an unlocking stage.

The pushing element 104 continues to rotate in the first direction from the second position, during which the first pushing portion 1041 pushes the rotating element 101 to rotate in the circumferential direction, and the second pushing portion 1042 pushes the locking element 103 to rotate in the circumferential direction, so that the locking element 103 and the rotating element 101 rotate synchronously in the circumferential direction, which is a synchronous rotation stage.

After the pushing member 104 stops rotating, the locking member 103 needs to return to the locking position from the unlocking position, which is a locking stage.

In the locking stage, the locking member 103 is driven to return to the locking position by the elastic force of the elastic member 105 disposed between the rotating member 101 and the fixed member 102.

The resilient member 105 may be arranged between the first wedge chamber and the second wedge chamber while being in contact with the blocking member 103 in the first wedge chamber and the blocking member 103 in the second wedge chamber, so that the same resilient member 105 may drive the blocking members 103 in both wedge chambers back to the blocking position.

The action process of the elastic member 105 is as follows: in the unlocking stage, the second pushing portion 1042 pushes the locking member 103, and the locking member 103 presses the elastic member 105, so that the elastic member 105 gradually accumulates elastic energy. In the synchronous rotation stage, the elastic member 105 is pushed by the locking member 103 to rotate synchronously with the rotating member 104. In the locking stage, the elastic member 105 releases the elastic energy to return the locking member 103 from the unlocking position to the locking position, and after the locking member 103 returns to the locking position, the elastic member 105 still has a part of the elastic energy which can stabilize the locking member 103 at the locking position.

A limiting structure may be disposed on the rotating member 101, and the limiting structure is used to limit the position of the elastic member 105, so as to ensure that the elastic member 105 is kept stable relative to the rotating member 101 when pressed by the locking member 103. In the illustrated embodiment, as shown in fig. 7 and 8, and fig. 7 and 8 are schematic views of two viewing angles of the rotating member, the limiting structure is a concave recess 101d provided on the outer circumferential surface of the rotating member 101, and the elastic member 105 is pressed into the concave recess 101d by the fixing member 102.

The spiral central line s of the elastic element 105 can be arranged parallel to the rotation axis C of the rotation element 101, so that the elastic element 105 can be more easily installed between the rotation element 101 and the fixing component 102, and when the elastic element is pressed by the locking element 103, the elastic element is mainly elastically deformed in the direction parallel to the rotation axis C, and the elastic deformation amount in the circumferential direction is smaller, so that the problem that the unlocking stroke is large due to the fact that the elastic deformation amount in the circumferential direction is too large can be solved.

An inner recess 105a and an outer protrusion 105b may be provided on the elastic member 105, the outer protrusion 105b of the elastic member 105 is compressed by the outer circumferential surface of the rotating member 101 and the inner circumferential surface of the fixed member 102, and the inner recess 105 is spaced from the outer circumferential surface of the rotating member 101 and the inner circumferential surface of the fixed member 102. This interval can store lubricating grease so that the rotational resistance in the synchronous rotation stage can be reduced.

The present application further provides a seat height adjuster, which includes an output mechanism (gear shaft 20), a fixing plate 30, a connecting mechanism 40, an operating mechanism 50, and the like, in addition to the locking mechanism 10.

The rotating member 101 of the locking mechanism 10 is in transmission connection with the gear shaft 20, and the ratchet 501 of the operating mechanism 50 is in transmission connection with the abutting member 104 of the locking mechanism 10. The fixing plate 30 is fixed outside the housing 1022.

The connecting mechanism 40 includes a central shaft 401, and the central shaft 401 passes through the central hole of the gear shaft 20, the central hole of the rotating member 101, the spline hole 1041a of the pushing member 104, and the central hole of the ratchet 501. One end of the central shaft 401 is provided with a flange 401a, the flange 401a abuts against one end face of the ratchet wheel 501, the periphery of the other end of the central shaft 401 is provided with a clamping groove, the clamping groove is clamped and fixed with a limiting sleeve 402 sleeved at the end, the limiting sleeve 402 abuts against one end face of the gear shaft 20, and under the limiting effect of the flange 401a and the limiting sleeve 402, the axial positions of all parts are stable and are not easy to disengage.

The operating mechanism 50 is not limited in structure, and various operating mechanisms known in the art, for example, the operating mechanism disclosed in ZL 201510872821.9, may be used.

When the fixing plate is applied to a seat, the fixing plate 30 is fixedly connected to the seat, and the gear shaft 20 is in meshing transmission with a toothed plate connected with the seat.

When the height of the seat needs to be adjusted, an external force is applied to the operating mechanism 50, the operating mechanism 50 drives the pushing piece 104 of the locking mechanism 10 to rotate, so that the pushing piece 103 is pushed to reach the unlocking position, and the unlocking is realized;

after unlocking, continuously applying external force to the operating mechanism 50, wherein the pushing part 104 drives the rotating part 101 to rotate, so as to drive the gear shaft 20 to rotate, and the rotating motion of the gear shaft 20 is converted into the motion of the seat along the height direction through the toothed plate, so that the height adjustment of the seat is realized;

after the target height is adjusted, the external force is removed, and the elastic piece 105 of the locking mechanism 10 drives the locking piece 103 to return to the locking position;

after the locking member 103 returns to the locking position, the rotation member 101 cannot rotate, and thus the gear shaft 30 and the tooth plate cannot rotate, and thus the seat is firmly locked at the target height position.

In the illustrated embodiment, as shown in fig. 7 and 8, one end of the rotating member 101 is provided with a non-circular (kidney-shaped in the figure) boss 101b, one end of the gear shaft 20 is provided with a groove 20a having a shape and a size substantially identical to those of the boss 101b, and the boss 101b is inserted into the groove 20a, so that the rotating member 101 and the gear shaft 20 are in transmission connection. Of course, the drive connection structure is not limited thereto.

In the illustrated embodiment, a protrusion is disposed at one end of the pushing member 104, and a through hole is disposed on the ratchet 501, and the protrusion is inserted into the through hole, thereby realizing the transmission connection. Of course, the drive connection structure is not limited thereto.

In the description herein, a component is mounted (disposed) in a space, either with the component completely mounted in the space or with a portion of the component mounted in the space and another portion extending outside the space. In the description herein, the circumferential direction refers to a direction around the rotation axis C. Radial refers to a direction perpendicular to the axis of rotation C. The axial direction refers to the extending direction of the rotation axis C. The term "inner" as used herein refers to a position relatively close to the rotation axis C in the radial direction, and the term "outer" refers to a position relatively far from the rotation axis C in the radial direction.

The locking mechanism and the seat height adjuster provided in the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims (10)

1. A locking mechanism, characterized in that the locking mechanism (10) comprises: the locking mechanism comprises a rotating piece (101), a fixed assembly (102) and a locking piece (103), wherein the fixed assembly (102) is sleeved outside the rotating piece (101) and forms a wedge-shaped cavity (A) between the fixed assembly and the rotating piece (101), and the locking piece (103) is arranged in the wedge-shaped cavity (A) and can rotate along the circumferential direction with the rotating piece (101) to move to a locking position or an unlocking position; the fixing component (102) comprises an outer shell (1022) and a sleeve body connected with the outer shell (1022).

2. The locking mechanism of claim 1, wherein the housing is a unitary structure; or, the sleeve body comprises a plurality of laminated bodies (1021) which are sequentially laminated along the axial direction, the first laminated body (1021) closest to the end wall (B) of the outer shell (1022) is fixed in position relative to the outer shell (1022) in the axial direction and the circumferential direction, and the laminated bodies (1021) in each layer are mutually limited in the circumferential direction and mutually free in the axial direction by mutual engagement of the concave parts and the convex parts which are arranged on the end surfaces.

3. The lock mechanism according to claim 2, wherein each of the laminated bodies (1021) has the same structure, and each of the laminated bodies (1021) has a concave portion on one end face and a convex portion on the other end face.

4. The lock mechanism according to claim 3, wherein the end wall (B) of the housing (1022) is provided with a concave portion or a convex portion for fitting with the convex portion or the concave portion of the first laminated body.

5. The latch mechanism of any of claims 2-4, wherein the first layer of laminate (1021) is welded to the outer housing (1022), and a weld (H) is located inside the outer housing (1022) or at an outer peripheral surface of the outer housing (1022); alternatively, the first laminated body (1021) and the side wall of the housing (1022) are in interference rivet press connection.

6. The locking mechanism according to claim 5, characterized in that the outer peripheral surface of the rotating member (101) has a flat area, and the wedge-shaped cavity (A) is formed between the flat area and the inner peripheral surface of the fixed component (102) when the rotating member (101) rotates to any position along the circumferential direction.

7. The locking mechanism according to claim 6, characterized in that a plurality of said wedge cavities (A) are formed in sequence along the circumferential direction, wherein at least one first wedge cavity and at least one second wedge cavity are included, the distance between the inner cavity wall and the outer cavity wall of the first wedge cavity is gradually reduced along the clockwise circumferential direction, the distance between the inner cavity wall and the outer cavity wall of the second wedge cavity is gradually reduced along the counterclockwise circumferential direction, and at least one locking piece (103) is installed in each wedge cavity (A); when the number of the first wedge cavities and the number of the second wedge cavities are also multiple, the first wedge cavities and the second wedge cavities are alternately arranged one by one along the circumferential direction.

8. The locking mechanism of claim 7, wherein the locking mechanism (10) further comprises an urging member (104), the urging member (104) comprising:

the first pushing part (1041) is used for pushing the rotating part (101) to rotate along the circumferential direction;

the second pushing part (1042) is used for pushing the locking piece (103) to move from the locking position to the unlocking position and pushing the locking piece (103) and the rotating piece (101) to rotate together along the circumferential direction;

when the second pushing portion (1042) contacts with the locking piece (103) located at the locking position, a circumferential gap is formed between the first pushing portion (1041) and the rotating piece (101), and the circumferential length of the circumferential gap is not smaller than the circumferential stroke of the locking piece (103) from the locking position to the unlocking position.

9. The locking mechanism according to claim 8, characterized in that the locking mechanism (10) further comprises an elastic member (105), the elastic member (105) is disposed between the rotating member (101) and the fixed member (102), and the locking member (103) is reset from the unlocking position to the locking position by means of the elastic force of the elastic member (105).

10. Seat height adjuster, characterized in that it comprises a locking mechanism (10) according to any one of claims 1 to 9, and further comprises an output mechanism, a connecting mechanism (40) and an operating mechanism (50); the connecting mechanism (40) connects the locking mechanism (10), the output mechanism and the operating mechanism (50) together; the operating mechanism (50) is in transmission connection with the locking mechanism (10) and can drive the rotating part (101) to rotate; the rotating part (101) of the locking mechanism (10) is in transmission connection with the output mechanism so as to drive the output mechanism to rotate, and the output mechanism is connected with the seat so as to drive the seat to lift.

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