Flexible limit mechanism

Abstract

The present invention discloses a limiting mechanism, which includes: a base, the base includes a base body and a through hole passing through the base body; a first bearing, the first bearing is installed in the through hole; a turntable, the turntable includes a turntable body inserted in the first bearing and a lever formed by a convex extension of the circumference of the turntable body; a limiting assembly, the limiting assembly and the lever are arranged on the same side of the base body; the limiting assembly includes a slider slidably arranged on the base body, a limiting portion formed by a convex extension of the slider on a side close to the turntable, and two elastic members respectively fixed to the two ends of the slider; the base body is provided with limiting surfaces on opposite sides corresponding to the limiting portion along its circumference; the lever rotates to the limiting portion until it presses against the limiting portion and drives the limiting portion to move, so that the limiting portion abuts against the limiting surface on the corresponding side to achieve limiting. The limiting mechanism of the present invention not only has few actions and a simple structure, but also occupies little space, has high reliability, and can reduce noise generation.

Description

Technical field

[0001] The present invention relates to the technical field of turntable limiting technology, and in particular to a flexible limiting mechanism. [Background Technology]

[0002] With the rapid development of mechanical technology, more and more industries have begun to use turntables to realize mechanical rotation operations.

[0003] At present, there are relatively few rotation positioning structures of the turntable of ±180° (plus or minus 180 degrees) in the existing technology, and most of the rotation positioning structures cannot simultaneously rotate the +180° and -180° structures. The rotation positioning structures in other application scenarios all use complex mechanical limits such as spiral positioning, follow-up slider matching buffer to cooperate with electrical limits or software limits to protect the abnormal rotation of the rotating mechanism.

[0004] However, the above-mentioned rotation positioning structure used in the turntable has many complex movements, occupies a large space, and has relatively poor compatibility with various types of turntables. Most of them only rely on electrical limits to achieve ±180° rotation positioning, which poses a potential risk of electrical component failure and has low application reliability on the turntable.

[0005] Therefore, it is necessary to provide a flexible limiting mechanism to solve the above problems. [Summary of the invention]

[0006] The technical problem to be solved by the present invention is how to provide a limiting mechanism with few movements, simple structure, small space occupation, high reliability and effective noise reduction.

[0007] In order to solve the above technical problems, the present invention provides a flexible limiting mechanism for achieving 180-degree forward and reverse limiting, which includes:

[0008] A base, the base comprising a base body and a circular through hole penetrating the base body;

[0009] a first bearing, the first bearing being mounted in the through hole and fixedly connected to the base body;

[0010] a turntable comprising an annular turntable body inserted into and fixedly connected to the first bearing, and a shift lever extending from a peripheral edge of the turntable body, wherein the turntable body is rotatably connected to the base body via the first bearing;

[0011] The cam is fixed to the base body with its upper end fixed on the lower end thereof, and its lower end is fixed with its lower end on its lower end, so that the cam can move relative to the lower end of the base body, thereby preventing the cam from moving.

[0012] The shift lever is rotated clockwise or counterclockwise to the limiting portion until it presses against the limiting portion and drives the limiting portion to move, so that when the shift lever is rotated 180 degrees, the limiting portion abuts against the limiting surface on the corresponding side to achieve limiting.

[0013] Preferably, the base also includes a circular mounting groove formed by the inward depression of the base body, a long strip-shaped slide groove formed by the inward depression of the base body and spaced from the mounting groove, and a connecting groove formed by the inward depression of the base body and connecting the mounting groove and the slide groove. The through hole is formed by passing through the bottom of the mounting groove to the other side, the slider is slidably arranged in the slide groove, and the limiting portion extends from the connecting groove to the mounting groove; the two opposite groove sides of the connecting groove serve as the two limiting surfaces located on opposite sides of the limiting portion.

[0014] Preferably, the flexible limiting mechanism further includes a cover plate which is arranged on the base body and completely covers the mounting groove, the sliding groove and the connecting groove; the cover plate is provided with a through hole at a position corresponding to the through hole.

[0015] Preferably, both ends of the slider are provided with inwardly recessed guide grooves, and the two elastic members are partially inserted into the two guide grooves.

[0016] Preferably, the base body and the cover plate each have two elastic members at positions away from one end of the slider respectively provided with inwardly recessed fixing grooves, and the two elastic members each have one end away from the slider respectively fixed to the corresponding fixing groove.

[0017] Preferably, the side of the slider close to the cover plate abuts against the cover plate and is provided with an inwardly recessed through groove, and the through groove extends along the sliding direction of the slider; the side of the slider away from the cover plate is provided with a protrusion that extends protrudingly and abuts against the bottom of the groove, and the protrusion extends along the sliding direction of the slider.

[0018] Preferably, the base body is provided with an inwardly recessed groove at a position corresponding to the edge of the cover plate; the cover plate is placed in the groove and fixed by a plurality of screws.

[0019] Preferably, the surface of the slider is treated with a diamond-like carbon coating.

[0020] Preferably, the turntable body includes an annular main body portion and a cylindrical extension portion protruding and extending axially from the inner edge of the main body portion, and the extension portion is inserted and fixed to the first bearing; the shift rod is formed by the peripheral edge of the main body portion protruding outward along its radial direction.

[0021] Preferably, the elastic member is a spring.

[0022] Compared with the related art, the flexible limit mechanism of the present invention is provided with a lever on the periphery of the turntable, and a limit assembly is provided on the base body, which is composed of a slider slidably arranged on the base body, a limit portion formed by a protrusion extending from the side of the slider close to the turntable, and two elastic members arranged along the sliding direction of the slider and fixed to the two ends of the slider respectively, and the two elastic members in the limit assembly are respectively fixedly connected to the base body at one end away from the slider, and two limit surfaces equidistant from the slider are respectively provided on the opposite sides of the base body corresponding to the limit portion along its circumference, so that when When the turntable rotates to nearly 180 degrees and its push rod presses against the limit part and drives the limit part to move, the limit can be achieved by the limit part abutting against the limit surface on the corresponding side, that is, the 180-degree limit of the turntable is achieved. When resetting, the push rod disengages from the limit part, and the limit part rebounds under the elastic force of the elastic parts at both ends of the slider to achieve reset, and the slider will not move back and forth on the base body, so as to reduce noise generation and have good stability. In addition, the flexible limit mechanism of the present invention adopts mechanical limit, which not only has fewer actions and simple structure, but also occupies little space and has high reliability.

Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0024] Figure 1 A schematic diagram of the three-dimensional structure of a flexible limiting mechanism provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the overall structure of a flexible limit mechanism provided by an embodiment of the present invention;

[0026] Figure 3 for Figure 1 NN line cross-sectional view;

[0027] Figure 4 A schematic diagram of a partial structural decomposition of a flexible limit mechanism provided in an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the structure of a slider in a flexible limiting mechanism provided by an embodiment of the present invention;

[0029] Figure 6 A schematic plan view of a turntable in a limiting mechanism provided by an embodiment of the present invention when the turntable is in an initial position;

[0030] Figure 7 A schematic plan view of a limit mechanism provided in an embodiment of the present invention when the turntable is rotated to 180 degrees and limited;

[0031] Figure 8 A schematic plan view of a limit mechanism according to an embodiment of the present invention showing a turntable rotated 180 degrees and limited in position.

[0032] In the figure, 100, flexible limiting mechanism; 1, base; 11, base body; 111, bottom plate; 112, peripheral wall; 113, top plate; 12, through hole; 13, limiting surface; 14, mounting groove; 15, slide groove; 16, connecting groove; 17, fixing groove; 18, groove; 2, first bearing; 3, turntable; 31, turntable body; 311, main body; 312, extension part; 32, shift rod; 4, limiting assembly; 41, slider; 411, guide groove; 412, through groove; 413, protrusion; 42, limiting part; 43, elastic member; 5, cover plate; 51, through hole; 6, second bearing; 7, motor; 8, first gear; 9, second gear. [Specific implementation method]

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] The embodiment of the present invention provides a flexible limiting mechanism 100, combined with Figures 1 to 5 As shown, it includes a base 1, a first bearing 2, a turntable 3 and a limiting assembly 4.

[0035] Specifically, the flexible limiting mechanism 100 is used to limit the turntable 3 in forward and reverse rotation (clockwise or counterclockwise) of 180 degrees.

[0036] The base 1 includes a base body 11 and a circular through hole 12 penetrating the base body 11 ; the first bearing 2 is mounted in the through hole 12 and is fixedly connected to the base body 11 .

[0037] The turntable 3 includes an annular turntable body 31 inserted into and fixedly connected to the first bearing 2 and a shift rod 32 extending from the periphery of the turntable body 31 . The turntable body 31 is rotatably connected to the base body 11 through the first bearing 2 .

[0038] The limiting assembly 4 and the shift rod 32 are arranged on the same side of the base body 11; the limiting assembly 4 includes a slider 41 slidably arranged on the base body 11, a limiting portion 42 formed by a protruding extension of the side of the slider 41 close to the turntable 3, and two elastic members 43 arranged along the sliding direction of the slider 41 and respectively fixed to the two ends of the slider 41, and the two elastic members 43 are respectively fixedly connected to the base body 11 at one end away from the slider 41. When the limiting portion 42 is in the initial position, it is located on a straight line with the same diameter of the turntable body 31 as the shift rod 32, and the limiting portion 42 is spaced apart from the turntable body 31; in addition, the base body 11 is provided with two limiting surfaces 13 equidistant from the limiting portion 42 on opposite sides of the limiting portion 42 along its circumference.

[0039] When the limiting portion 42 is in the initial position, that is, when the turntable 3 is in the initial position, the limiting portion 42 and the shift rod 32 are respectively located on opposite sides of the turntable 3; when the shift rod 32 is rotated clockwise or counterclockwise to the limiting portion 42 until it presses against the limiting portion 42 and drives the limiting portion 42 to move, so that when the shift rod 32 rotates 180 degrees, the limiting portion 42 abuts against the limiting surface 13 on the corresponding side to achieve limiting; when the shift rod 32 is reset, that is, when the shift rod 32 returns to the initial position, the shift rod 32 is separated from the limiting portion 42, and the limiting portion 42 will rebound under the elastic force of the elastic members 43 at both ends of the slider 41 to achieve reset, and the slider 41 will not move back and forth on the base body 11, so as to reduce noise generation and have good stability.

[0040] In this embodiment, the base 1 further includes a circular mounting groove 14 formed by an inward depression of the base body 11, a strip-shaped slide groove 15 formed by an inward depression of the base body 11 and spaced from the mounting groove 14, and a connecting groove 16 formed by an inward depression of the base body 11 and connecting the mounting groove 14 and the slide groove 15. The through hole 12 is formed by extending from the bottom of the mounting groove 14 to the other side. The slider 41 is slidably disposed in the slide groove 15, and the limiting portion 42 extends from the connecting groove 16 to the mounting groove 14. This arrangement can move the turntable 3, the slider 41, and the limiting portion 42 away from the plane of the base body 11 and closer to the plane of the base body 11, or parallel to / lower than the plane of the base body 11, thereby reducing the overall height of the flexible limiting mechanism 100, making it occupy less space and more adaptable.

[0041] The opposing side surfaces of the connecting groove 16 serve as two limiting surfaces 13 located on opposite sides of the limiting portion 42. This arrangement not only reduces the overall height of the flexible limiting mechanism 100 but also facilitates the formation of the limiting surfaces 13. Of course, depending on actual needs, the mounting groove 14, the sliding groove 15, and the connecting groove 16 can be omitted. However, the base body 11 should be provided with protruding structures extending from opposite sides of the limiting portion 42 along its circumference, so that these two protruding structures form the limiting surfaces 13 corresponding to the planes on opposite sides of the limiting portion 42.

[0042] When no external force is applied, the slider 41 is held in the center of the slide groove 15 by the elastic force of the two elastic members 43. The slider 41 and the stopper 42 form a T-shaped structure. This arrangement allows the two elastic members 43 of equal length to better control the posture of the slider 41 and the stopper 42, preventing them from shaking during rebound, reducing wear caused by collision with the base body 11, and reducing noise.

[0043] The surface of the slider 41 is treated with diamond-like carbon coating (DLC). This setting can effectively improve the hardness and wear resistance of the slider 41 to reduce the friction coefficient between it and the base body 11, thereby improving the sliding performance of the slider 41 and reducing the rotational torque of the turntable 3.

[0044] The elastic member 43 is a spring. Of course, according to actual needs, the elastic member 43 can also be selected from components with elastic recovery such as C-shaped spring pieces and S-shaped spring pieces.

[0045] The turntable body 31 comprises an annular main portion 311 and a cylindrical extension portion 312 extending axially from the inner edge of the main portion 311. The extension portion 312 is inserted and fixed to the first bearing 2. The lever 32 is formed by extending radially outward from the peripheral edge of the main portion 311. This arrangement creates a hollow structure for the turntable 3, facilitating the passage of wiring harnesses and preventing excessive twisting of the wiring harnesses during rotation. The extension portion 312 is inserted behind the first bearing 2 and passes through the through hole 12.

[0046] In addition, the flexible limiting mechanism 100 also includes a cover plate 5 that covers the base body 11 and completely covers the mounting slot 14, the slide slot 15, and the connecting slot 16. The cover plate 5 is provided with a through-hole 51 at a position corresponding to the through-hole 12. This arrangement allows the cover plate 5 to protect the turntable 3 in the mounting slot 14, the slider 41 in the slide slot 15, and the limiting portion 42 in the connecting slot 16, preventing exposure and potential safety hazards.

[0047] The base body 11 is provided with an inwardly recessed groove 18 at a position corresponding to the edge of the cover plate 5. The cover plate 5 is positioned within the groove 18 and secured with multiple screws. This arrangement allows the cover plate 5 to move away from the plane of the base body 11 and closer to the plane of the base body 11, or to be parallel to or lower than the plane of the base body 11, thereby reducing the overall height of the flexible limiter mechanism 100, making it occupy less space and more adaptable.

[0048] Slider 41 is provided with inwardly recessed guide grooves 411 at each end, and two elastic members 43 are partially inserted into the guide grooves 411 at each end of slider 41. Inwardly recessed fixing grooves 17 are provided on the base body 11 and the cover plate 5, respectively, corresponding to the ends of the two elastic members 43 away from slider 41. The ends of the two elastic members 43 away from slider 41 are fixed to the corresponding fixing grooves 17. That is, two fixing grooves 17 are provided on the base body 11, and two fixing grooves 17 are provided on the cover plate 5. This arrangement not only better secures the elastic members 43, but also provides guidance for the working path of the elastic members 43 and facilitates the posture control of the elastic members 43, thereby improving the working efficiency of the elastic members 43.

[0049] The side of the slider 41 closest to the cover plate 5 abuts against the cover plate 5 and is provided with an inwardly recessed through-slot 412. The through-slot 412 extends along the sliding direction of the slider 41 and is located in the middle area of the side of the slider 41, extending from one end to the other of the slider 41. This arrangement effectively reduces the contact area between the slider 41 and the cover plate 5, thereby improving the sliding efficiency of the slider 41.

[0050] A protrusion 413 is provided on the side of the slider 41 away from the cover plate 5, extending outward and contacting the bottom of the chute 15. The protrusion 413 extends along the sliding direction of the slider 41 and is located in the middle area of the side of the slider 41, extending from one end to the other of the slider 41. This arrangement effectively reduces the contact area between the slider 41 and the chute 15, thereby improving the sliding efficiency of the slider 41.

[0051] The base body 11 includes a bottom plate 111, an annular peripheral wall 112 extending from the outer periphery of the bottom plate 111 away from the turntable 3, and a top plate 113 covering the peripheral wall 112 away from the bottom plate 111. Through holes 12 sequentially extend through the bottom plate 111 and the top plate 113. The first bearing 2 is disposed in the through hole 12 of the bottom plate 111, and the stop assembly 4 is disposed on the side of the bottom plate 111 away from the top plate 113. The extension portion 312 of the turntable body 31 extends through the through hole 12 of the bottom plate 111 to the through hole 12 of the top plate 113.

[0052] The flexible limiting mechanism 100 also includes a second bearing 6 installed in a through hole 12 on the top plate 113 and fixedly connected to the top plate 113, a motor 7 fixed to the side of the bottom plate 111 away from the turntable 3, a first gear 8 fixed to the output end of the motor 7, and a second gear 9 sleeved and fixed on the extension part 312 and meshing with the first gear 8; the end of the extension part 312 away from the turntable 3 is inserted into the second bearing 6 and fixedly connected thereto, and the extension part 312 is rotationally connected to the top plate 113 through the second bearing 6.

[0053] The flexible limiting mechanism 100 in this embodiment can be applied to mechanical structures that require rotation limitation, such as a robot turntable 3 and a rotating part of a desktop fan.

[0054] The flexible limit mechanism 100 in this embodiment works as follows: When the turntable 3 rotates clockwise or counterclockwise until the lever 32 on the turntable 3 contacts the limit portion 42, the limit portion 42 is connected to the slider 41, and springs are installed at both ends of the slider 41. This allows the lever 32 to drive the limit portion 42 and the slider 41 to move together until the limit portion 42 abuts the corresponding limit surface 13, thereby preventing the limit portion 42 from moving and the lever 32 from moving. This allows the turntable 3 to rotate to a 180-degree limit. When the turntable 3 needs to be reset, the lever 32 disengages the limit portion 42 and returns to its initial position. The limit portion 42, under the elastic force of the springs at both ends of the slider 41, rebounds to its initial position, preparing for the next limit. Because the springs control the position of the slider 41 in a vibrating environment, the provision of springs prevents the slider 41 from shaking during rebound, reducing collision wear and noise.

[0055] Combine Figures 6 to 8 As shown, Figure 6 This is a schematic plan view of a flexible limiting mechanism 100 provided in an embodiment when the turntable 3 is in an initial position. Figure 7 This is a plan view of a flexible limiting mechanism 100 provided in this embodiment when the turntable 3 is rotated to 180 degrees and limited. Figure 8 This is a plan view of a flexible limiting mechanism 100 provided in an embodiment when the turntable 3 is reversed to a certain degree and limited. The specific limiting principle is:

[0056] like Figure 6 As shown, when the turntable 3 is in the initial position, the shifting rod 32 of the turntable 3 is in position A, and the limiting portion 42 is in position B due to the interaction of the springs at both ends of the slider 41.

[0057] like Figure 7As shown, during the process of the turntable 3 rotating forward (clockwise) by 180 degrees, the limiting portion 42 moves from position B to position B1 under the push of the shift rod 32, and is prevented from moving to the right by the limiting surface 13 on the base body 11. The locking of the limiting portion 42 limits the rotation of the shift rod 32, that is, limits the forward rotation of the turntable 3, so that the shift rod 32 on the turntable 3 is in position A1, thereby realizing the limit of the turntable 3 rotating forward by 180 degrees; when the turntable 3 is reset, that is, in the process of reversing 180 degrees, the shift rod 32 disengages from the limiting portion 42, and the slider 41 returns to position B from position B1 under the action of the springs at both ends thereof. During this process, the slider 41 will drive the limit to return to the initial position.

[0058] like Figure 8 As shown, during the process of the turntable 3 reversing (rotating counterclockwise) 180 degrees, the limiting portion 42 moves from position B to position B2 under the push of the shift rod 32, and is prevented from moving to the left by the limiting surface 13 on the base body 11. The locking of the limiting portion 42 limits the rotation of the shift rod 32, that is, limits the reversal of the turntable 3, so that the shift rod 32 on the turntable 3 is in position A1, thereby realizing the limit of the reversal of the turntable 3 by 180 degrees; when the turntable 3 is reset, that is, during the process of forward rotation 180 degrees, the shift rod 32 disengages from the limiting portion 42, and the slider 41 returns to position B from position B1 under the action of the springs at both ends thereof. During this process, the slider 41 will drive the limit to return to the initial position.

[0059] Compared with the related art, the flexible limiting mechanism 100 of this embodiment is provided with a lever 32 on the periphery of the turntable 3, and a limiting assembly 4 is provided on the base body 11, which is composed of a slider 41 slidably provided on the base body 11, a limiting portion 42 formed by a protrusion extending from one side of the slider 41 close to the turntable 3, and two elastic members 43 provided along the sliding direction of the slider 41 and fixed to both ends of the slider 41 respectively. The two elastic members 43 in the limiting assembly 4 are respectively fixedly connected to the base body 11 at one end away from the slider 41, and two limiting surfaces 1 are respectively provided on the opposite sides of the base body 11 corresponding to the limiting portion 42 along its circumference, which are equidistant from the slider 41. 3. In this way, when the turntable 3 rotates to nearly 180 degrees and its shifting rod 32 presses against the limiting portion 42 and drives the limiting portion 42 to move, the limiting portion 42 can be abutted against the limiting surface 13 on the corresponding side to achieve limiting, that is, the 180-degree limit of the turntable 3 is achieved. When resetting, the shifting rod 32 is separated from the limiting portion 42, and the limiting portion 42 rebounds under the elastic force of the elastic members 43 at both ends of the slider 41 to achieve reset, and the slider 41 will not move back and forth on the base body 11, so as to reduce noise generation and have good stability. In addition, the flexible limiting mechanism 100 of the present invention adopts mechanical limiting, which not only has fewer actions and a simple structure, but also occupies less space and has high reliability.

[0060] The above description is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present invention, but these improvements all fall within the scope of protection of the present invention.

Claims

1. A flexible limit mechanism for achieving 180-degree forward and reverse rotation limit, characterized in that: The limiting mechanism includes: A base, the base comprising a base body and a circular through hole penetrating the base body; a first bearing, the first bearing being mounted in the through hole and fixedly connected to the base body; a turntable comprising an annular turntable body inserted into and fixedly connected to the first bearing, and a shift lever extending from a peripheral edge of the turntable body, wherein the turntable body is rotatably connected to the base body via the first bearing; The cam is fixed to the base body with one end fixed on the other end of the cam, and the other end fixed on the other end of the cam. The shift lever is rotated clockwise or counterclockwise to the limiting portion until it presses against the limiting portion and drives the limiting portion to move, so that when the shift lever is rotated 180 degrees, the limiting portion abuts against the limiting surface on the corresponding side to achieve limiting.

2. The flexible limiting mechanism according to claim 1, characterized in that: The base also includes a circular mounting groove formed by the inward depression of the base body, a long strip-shaped slide groove formed by the inward depression of the base body and spaced from the mounting groove, and a connecting groove formed by the inward depression of the base body and connecting the mounting groove and the slide groove. The through hole is formed by passing through the bottom of the mounting groove to the other side, the slider is slidably arranged in the slide groove, and the limiting portion extends from the connecting groove to the mounting groove; the opposite side surfaces of the connecting groove serve as the two limiting surfaces located on opposite sides of the limiting portion.

3. The flexible limiting mechanism according to claim 2, characterized in that: The flexible limiting mechanism further includes a cover plate which is arranged on the base body and completely covers the mounting groove, the sliding groove and the connecting groove; the cover plate is provided with a through hole at a position corresponding to the through hole.

4. The flexible limiting mechanism according to claim 3, characterized in that: Both ends of the sliding block are respectively provided with inwardly recessed guide grooves, and the two elastic members are respectively partially inserted into the two guide grooves.

5. The flexible limiting mechanism according to claim 4, characterized in that: The base body and the cover plate are each provided with an inwardly recessed fixing groove at a position corresponding to the two elastic members away from one end of the slider, and the two elastic members are each fixed to the corresponding fixing groove at one end away from the slider.

6. The flexible limiting mechanism according to claim 4, characterized in that: The side of the slider close to the cover plate abuts against the cover plate and is provided with an inwardly recessed through groove, and the through groove extends along the sliding direction of the slider; the side of the slider away from the cover plate is provided with a protrusion that extends protruding and abuts against the bottom of the groove, and the protrusion extends along the sliding direction of the slider.

7. The flexible limiting mechanism according to claim 4, characterized in that: The base body is provided with an inwardly recessed groove at a position corresponding to the edge of the cover plate; the cover plate is placed in the groove and fixed by a plurality of screws.

8. The flexible limiting mechanism according to claim 2, characterized in that: The surface of the slider is treated with a diamond-like carbon coating.

9. The flexible limiting mechanism according to claim 1, wherein: The turntable body includes an annular main body portion and a cylindrical extension portion protruding and extending axially from the inner edge of the main body portion, and the extension portion is inserted and fixed to the first bearing; the shift rod is formed by the peripheral edge of the main body portion protruding and extending radially outward.

10. The flexible limiting mechanism according to claim 1, characterized in that: The elastic member is a spring.

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