Gear pawl transmission mechanism

Abstract

The utility model relates to the technical field of mechanical transmission, and particularly discloses a gear pawl transmission mechanism. The mechanism comprises a base, a control assembly, a transmission assembly, a pawl assembly rotationally connected to the base and an elastic piece elastically connected with the pawl assembly and the base. The transmission assembly comprises a transmission shaft rotationally connected to the base, a main gear coaxially arranged on the transmission shaft in a sleeving mode and a locking piece for fixing the main gear to the transmission shaft in the axial direction, and the locking piece is loosened and tightened to change rotation damping of the main gear. The pawl assembly is meshed and matched with the main gear to prevent the main gear from rotating reversely; the elastic piece drives the pawl assembly to be matched with the main gear. The control assembly can move between the avoiding position and the driving position, when the control assembly is located at the avoiding position, the control assembly and the pawl assembly are spaced, and when the control assembly is located at the driving position, the control assembly pushes the pawl assembly to be disengaged from the main gear, so that the pawl assembly and the main gear are spaced. According to the mechanism, rotation damping is adjusted by loosening and tightening the locking piece, and selective bidirectional movement of the main gear is achieved through the control assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical drive technical field especially relates to gear ratchet drive mechanism. BACKGROUND

[0002] At present, the device of one-way motion reverse locking usually adopts the structure that ratchet and standard involute gear are installed in series on the same rotating transmission main shaft, and the structure realizes the function of one-way motion to reverse locking through the meshing of pawl and ratchet. However, the existing structure has the following shortcomings and deficiencies in actual application:

[0003] 1) many parts, high manufacturing cost, complex installation and large space occupation;

[0004] 2) without damping adjustment function;

[0005] 3) only one-way motion can be realized, and bidirectional motion cannot be realized conveniently.

[0006] In view of the above problems, there is a demand for improving the one-way motion reverse locking device in the market, and a gear ratchet drive mechanism is urgently needed to meet the above demand. UTILITY MODEL CONTENTS

[0007] The utility model discloses a gear ratchet drive mechanism, which realizes the function of one-way motion reverse locking through the direct meshing of gear and pawl, and has bidirectional motion capability and adjustable design of rotary motion damping.

[0008] To achieve this purpose, the utility model adopts the following technical scheme:

[0009] Gear ratchet drive mechanism, including base, transmission assembly, pawl assembly, elastic part and control assembly, the transmission assembly includes transmission shaft, main gear and locking piece, the transmission shaft is rotatably connected to the base, the main gear coaxial sleeve is set on the transmission shaft, the locking piece axially fixes the main gear on the transmission shaft, the locking piece is loosened or tightened to change the rotation damping of the main gear, and the main gear in the forward rotation can drive the external transmission part, the pawl assembly is rotatably connected to the base, the pawl assembly is engaged with the main gear to prevent the reverse rotation of the main gear, the elastic part elastically connects the pawl assembly and the base, and the elastic part is used to drive the pawl assembly to cooperate with the main gear, the control assembly is movably connected to the base, the control assembly can move between the avoiding position and the driving position relative to the base, when the control assembly is in the avoiding position, the control assembly is spaced apart from the pawl assembly, when the control assembly is in the driving position, the control assembly pushes the pawl assembly to disengage the main gear, so that the pawl assembly is spaced apart from the main gear.

[0010] As an alternative technical solution of the gear-ratchet drive mechanism, the control assembly comprises a self-locking release member having a rotating portion and a contact portion fixed to the rotating portion, the self-locking release member being rotatable relative to the base about the axis of the rotating portion, and the contact portion pushing the ratchet assembly when the control assembly is in the driving position.

[0011] As an alternative technical solution of the gear-ratchet drive mechanism, the control assembly further comprises a retaining ring, the retaining ring being sleeved on the rotating portion, the rotating portion penetrating through the base and being rotationally fitted with the base, and the retaining ring being in contact with the base from both sides of the contact portion so as to axially stop the rotating portion on the base.

[0012] As an alternative technical solution of the gear-ratchet drive mechanism, the contact portion is an elliptic cylinder, the elliptic cylinder being coaxial with the rotating portion, and the major axis of the elliptic cylinder being perpendicular to the length direction of the ratchet assembly when the control assembly is in the driving position.

[0013] As an alternative technical solution of the gear-ratchet drive mechanism, the ratchet assembly comprises a ratchet body, a pin shaft and a positioning pin, one end of the ratchet body being used for contacting the main gear, the other end of the ratchet body being fixed with the pin shaft, the pin shaft being movably connected to the base, and the pin shaft being rotatable relative to the base about the axis of the pin shaft, the positioning pin being fixed to the middle part of the ratchet body, and the end part of the elastic member being fixed to the positioning pin.

[0014] As an alternative technical solution of the gear-ratchet drive mechanism, the control assembly, the transmission assembly and the elastic member are located on the same side of the ratchet body.

[0015] As an alternative technical solution of the gear-ratchet drive mechanism, the transmission assembly further comprises a rotating bearing, the inner ring of the rotating bearing being sleeved on the transmission shaft, the outer ring of the rotating bearing being fixed to the base, and the main gear being axially fixed between the inner ring of the rotating bearing and the locking member.

[0016] As an alternative technical solution of the gear-ratchet drive mechanism, the transmission assembly further comprises a bearing retaining ring, the bearing retaining ring being sleeved on the transmission shaft and being clamped between the inner ring of the rotating bearing and the main gear.

[0017] As an alternative technical solution of the gear-ratchet drive mechanism, the tooth shape of the main gear is involute tooth shape, and the tooth shape of the ratchet assembly is involute tooth shape.

[0018] As an alternative technical solution of the gear ratchet drive mechanism, the external transmission member is a driven gear, and the main gear is in meshing engagement with the driven gear to drive the driven gear to rotate around the axis of the driven gear; or, the external transmission member is a rack, and the main gear is in meshing engagement with the rack to drive the rack to move along the length direction of the rack.

[0019] The utility model discloses the beneficial effects of:

[0020] The gear ratchet drive mechanism adjusts the compression force of the locking nut to the main gear through the locking nut, can flexibly change the rotational motion damping of the main gear, satisfies various complex working environments and working demands;The direct meshing cooperation of the ratchet assembly and the main gear prevents the reverse rotation of the main gear, and the elastic member drives the ratchet assembly to cooperate with the main gear, thereby realizing the one-way motion reverse locking function, ensuring that the main gear can be driven to rotate in the positive direction to drive the external transmission member, and guaranteeing the stability and one-way nature of the transmission;The meshing and disengaging of the ratchet assembly and the main gear can be controlled by combining the control assembly, so that the main gear has bidirectional motion capability, the controllability of the bidirectional rotation of the main gear is guaranteed by the setting of the control assembly, and the flexibility and reliability of the gear ratchet drive mechanism are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure schematic diagram of the gear ratchet drive mechanism provided by the utility model embodiment;

[0022] Figure 2 It is the explosion drawing of the gear ratchet drive mechanism provided by the utility model embodiment;

[0023] Figure 3 It is the structure schematic diagram of the gear ratchet drive mechanism when the control assembly is in the avoiding position provided by the utility model embodiment;

[0024] Figure 4 It is the structure schematic diagram of the gear ratchet drive mechanism when the control assembly is in the driving position provided by the utility model embodiment;

[0025] Figure 5 It is the structure schematic diagram of the gear ratchet drive mechanism and the driven gear provided by the utility model embodiment;

[0026] Figure 6 It is the structure schematic diagram of the gear ratchet drive mechanism and the rack provided by the utility model embodiment.

[0027] In the drawings:

[0028] 100, control assembly; 110, self-locking release; 120, retaining ring;

[0029] 200, transmission assembly; 210, transmission shaft; 220, locking member; 230, main gear; 240, bearing retaining ring; 250, rotating bearing;

[0030] 300, pawl assembly; 310, pawl body; 320, pin shaft; 330, positioning pin;

[0031] 400, elastic member;

[0032] 500, base; 510, seat body; 511, limiting hole; 520, friction plate; 530, support column;

[0033] 910, driven gear; 920, rack. DETAILED DESCRIPTION

[0034] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the first feature is "above", "above" and "above" the second feature, which includes the first feature above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "below", "below" and "below" the second feature, which includes the first feature below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication inside two elements.For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0037] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0038] As Figures 1 to 4 The utility model provides gear pawl drive mechanism, including base 500, transmission assembly 200, pawl assembly 300, elastic part 400 and control assembly 100, transmission assembly 200 includes transmission shaft 210, main gear 230 and locking piece 220, transmission shaft 210 rotationally connected in base 500, main gear 230 coaxially covers and is set in transmission shaft 210, locking piece 220 fixes main gear 230 axially on transmission shaft 210, through tight locking piece 220, to change the rotation damping of main gear 230, the main gear 230 of forward rotation can drive external transmission spare;Pawl assembly 300 rotationally connected in base 500, pawl assembly 300 and main gear 230 meshing cooperation to prevent main gear 230 reverse rotation;Elastic part 400 elastically connects pawl assembly 300 and base 500, and elastic part 400 is used to drive pawl assembly 300 and main gear 230 cooperation;Control assembly 100 movably connected in base 500, control assembly 100 can be moved between the avoiding position and the driving position relative to base 500, when control assembly 100 is in the avoiding position, control assembly 100 and pawl assembly 300 are spaced apart, when control assembly 100 is in the driving position, control assembly 100 promotes pawl assembly 300 and disconnects main gear 230, makes pawl assembly 300 and main gear 230 spaced apart. Specifically, elastic part 400 is tension spring;Locking piece 220 is locking nut.

[0039] The gear ratchet drive mechanism adjusts the compression force of the locking nut on the main gear 230 through the tight locking nut, can flexibly change the rotational motion damping of the main gear 230, and meets various complex working environments and working requirements; at the same time, the direct meshing of the ratchet assembly 300 and the main gear 230 prevents the reverse rotation of the main gear 230, the elastic member 400 drives the ratchet assembly 300 to cooperate with the main gear 230, thereby realizing the one-way motion reverse locking function, ensuring that the main gear 230 can be driven in a positive direction to rotate the external transmission member, and guaranteeing the stability and one-way nature of the transmission; in combination with the control assembly 100, the meshing and disengaging of the ratchet assembly 300 and the main gear 230 can be controlled, so that the main gear 230 has bidirectional motion capability, the setting of the control assembly 100 guarantees the controllability of the bidirectional rotation of the main gear 230, and the flexibility and reliability of the gear ratchet drive mechanism are improved. The above-mentioned gear ratchet drive mechanism cancels the ratchet and the corresponding connecting parts, reduces the occupied space, and has the characteristics of high efficiency, stability, reliability and flexibility.

[0040] In the embodiment, the control assembly 100 includes a self-locking release member 110, the self-locking release member 110 has a rotating part and a contact part fixed on the rotating part, and the self-locking release member 110 can rotate relative to the base 500 around the axis of the rotating part. When the control assembly 100 is in the driving position, the contact part pushes the ratchet assembly 300.

[0041] The design of the self-locking release member 110 in the control assembly 100 has a rotating part and a contact part. When the control assembly 100 is in the avoiding position, the control assembly 100 is spaced apart from the ratchet assembly 300 and does not interfere with each other. When the control assembly 100 is in the driving position, the contact part of the self-locking release member 110 can push the ratchet assembly 300 to disengage the main gear 230, realize the function switching of self-locking and release, achieve flexible operation and precise control of the gear ratchet drive mechanism, and improve the convenience of use. The control assembly 100 controls the meshing state of the main gear 230 and the ratchet assembly 300 through the above-mentioned mode, enhances the flexibility and controllability of the gear ratchet drive mechanism.

[0042] Further, the control assembly 100 further includes a retaining ring 120, the retaining ring 120 is sleeved on the rotating part, the rotating part penetrates through the base 500 and is in rotational cooperation with the base 500, and the retaining ring 120 and the contact part are in contact with the base 500 from both sides, so that the rotating part is axially stopped on the base 500.

[0043] The cooperation of the retaining ring 120 and the contact part makes the rotating part stably axially stop on the base 500 and can rotate around the base 500, improves the working stability and reliability of the control assembly 100, avoids the shaking or displacement of the control assembly 100 during the working process, and improves the stability and durability of the gear ratchet drive mechanism.

[0044] In the embodiment, the contact part is an elliptic cylinder, which is coaxial with the rotating part, and the long axis of the elliptic cylinder is perpendicular to the length direction of the pawl assembly 300 when the control assembly 100 is in the driving position.

[0045] The contact part is designed as an elliptic cylinder, and the long axis direction of the elliptic cylinder is perpendicular to the length direction of the pawl assembly 300 when the control assembly 100 is in the driving position. This design makes the contact part more efficient when pushing the pawl assembly 300, which is beneficial to improve the operability and flexibility of the gear and pawl transmission mechanism, and also reduces unnecessary force loss and error, and improves transmission efficiency.

[0046] As shown in Figure 4 , the angle between the long axis direction of the elliptic cylinder and the length direction of the pawl assembly 300 is θ, and θ = 90° when the control assembly 100 is in the driving position. At this time, the self-locking release 110 and the pawl body 310 are in a vertical dead angle state, so they can be self-locked to ensure that the pawl assembly 300 and the main gear 230 are disengaged.

[0047] Continuing to refer to Figures 1 to 4 , the pawl assembly 300 includes a pawl body 310, a pin shaft 320, and a positioning pin 330. One end of the pawl body 310 is used to contact the main gear 230, and the other end is fixedly connected with the pin shaft 320. The pin shaft 320 is movably connected to the base 500, and the pin shaft 320 can rotate about the axis of the pin shaft 320 relative to the base 500. The positioning pin 330 is fixedly connected to the middle part of the pawl body 310, and the end of the elastic member 400 is fixed to the positioning pin 330.

[0048] The pawl body 310, the pin shaft 320, and the positioning pin 330 in the pawl assembly 300 are designed to be simple and reasonable, easy to assemble and disassemble, and enable the pawl body 310 to rotate about the axis of the pin shaft 320 relative to the base 500 and engage with the main gear 230. At the same time, the elastic member 400 is fixed to the pawl body 310 through the positioning pin 330, which provides elastic restoring force for the gear and pawl transmission mechanism, and realizes reliable engagement and automatic reset function of the pawl assembly 300 and the main gear 230.

[0049] Among them, the movable connection of the pin shaft 320 enables the pawl body 310 to rotate relative to the base 500, and the positioning pin 330 is used to fix the elastic member 400, so as to realize the reliable engagement and disengagement of the pawl assembly 300 and the main gear 230.

[0050] Specifically, the positioning pin 330 is a stepped screw, which is screwed on the pawl body 310, and one end of the elastic member 400 is hooked on the screw rod of the stepped screw.

[0051] Further, the control assembly 100, the transmission assembly 200 and the elastic member 400 are located on the same side of the pawl body 310.

[0052] The layout of the control assembly 100, the transmission assembly and the elastic member 400 on the same side of the pawl body 310 makes the overall gear-pawl transmission mechanism more compact, improves the space utilization, helps to reduce the occupied space, improves the overall and working coordination of the gear-pawl transmission mechanism, and is convenient for maintenance and repair.

[0053] As shown in Figure 3 , when the control assembly 100 is in the avoiding position, the unlocking force of the main gear 230 is F, and the component force of the elastic member 400 is F1. This embodiment takes γ = 25° as an example for illustration.

[0054] At this time, F1 = F sin 25°, F ≈ 2.4F1, and there is no dead angle, thereby avoiding the situation that the main gear 230 cannot push the pawl body 310.

[0055] Continuing to refer to Figures 1 to 4 , the transmission assembly 200 further comprises a rotating bearing 250, the inner ring of the rotating bearing 250 is sleeved on the transmission shaft 210, the outer ring of the rotating bearing 250 is fixedly connected to the base 500, and the main gear 230 is axially fixed between the inner ring of the rotating bearing 250 and the locking member 220.

[0056] The rotating bearing 250 in the transmission gear assembly is used to realize the axial fixation of the main gear 230 and ensure the stable rotating connection between the transmission shaft 210 and the base 500, so that the main gear 230 can stably rotate on the transmission shaft 210 and be axially fixed by the locking nut. This design improves the stability and reliability of the rotation of the main gear 230, improves the transmission efficiency and service life, reduces the friction and noise in the transmission process, and is also convenient for installation and maintenance.

[0057] Exemplarily, the transmission assembly 200 further comprises a bearing retainer 240, which is sleeved on the transmission shaft 210 and clamped between the inner ring of the rotating bearing 250 and the main gear 230.

[0058] The design of the bearing retainer 240 is used to fix the main gear 230 and the rotating bearing 250 on the transmission shaft 210, preventing unnecessary movement or deformation, thereby ensuring the accuracy and stability of the transmission process and enhancing the structural strength and stability of the entire transmission gear assembly.

[0059] Specifically, the rotating bearing 250 is a ball rotor bearing.

[0060] In this embodiment, the tooth shape of the main gear 230 is involute tooth shape, and the tooth shape of the pawl assembly 300 is involute tooth shape.

[0061] The standard involute gear meshes with an involute tooth profile, resulting in high meshing precision and minimal backlash during reverse locking. This design overcomes the low meshing precision found in existing gear-and-pawl transmissions, resulting in a smoother meshing process and reduced meshing shock and noise. This improves gear transmission efficiency and meshing performance, while also reducing noise and wear, extending the lifespan and stability of the gear-and-pawl transmission.

[0062] like Figures 1 to 5 As shown, in one implementation of this embodiment, the external transmission member is a driven gear 910 , and the main gear 230 is conjugately meshed with the driven gear 910 to drive the driven gear 910 to rotate around the axis of the driven gear 910 .

[0063] like Figures 1 to 4 as well as Figure 6 As shown, in another implementation of this embodiment, the external transmission component is a rack 920, and the main gear 230 is conjugately engaged with the rack 920 to drive the rack 920 to move along the length direction of the rack 920.

[0064] The gear-and-pawl transmission mechanism can drive the driven gear 910 to rotate about its axis or drive the rack 920 to move along its length, thereby meeting different external transmission requirements and being applicable to a variety of external transmission components, demonstrating its wide applicability and practicality. Furthermore, through the precise control of the control assembly 100, the transmission process can be unidirectional and controllable, enabling its application in various usage scenarios. Furthermore, the above-described transmission method is characterized by high efficiency, stability, and reliability, and can be widely applied to various mechanical transmission systems.

[0065] In other implementations of this embodiment, the specific structure and transmission method of the external transmission component are determined by personnel in this field based on engineering practice. The determination method is common knowledge in this field and will not be elaborated here.

[0066] Specifically, the base 500 includes a base body 510, to which a friction plate 520 and a pillar 530 are fixed. The surface of the friction plate 520 slides with the surface of the transmission assembly 200. The friction plate 520 is made of copper, and the other end of the elastic member 400 is hooked on the pillar 530. The base body 510 passes through a limiting hole 511, and the external stop member can be inserted into the limiting hole 511 and contact the contact portion to fix the relative position of the self-locking release member 110 and the base body 510.

[0067] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A gear pawl drive mechanism, characterized by, The utility model relates to a kind of driving device, including: Base (500); Transmission assembly (200), including transmission shaft (210), main gear (230) and locking piece (220), the transmission shaft (210) is rotatably connected to the base (500), the main gear (230) coaxially covers and is set on the transmission shaft (210), the locking piece (220) is axially fixed on the transmission shaft (210) with the main gear (230), by loosening the locking piece (220), to change the rotation damping of the main gear (230), the main gear (230) can drive external transmission member in positive rotation; Pawl assembly (300), rotatably connected to the base (500), the pawl assembly (300) is engaged with the main gear (230) to prevent the main gear (230) from reverse rotation; Elastic member (400), elastically connecting the pawl assembly (300) and the base (500), the elastic member (400) is used to drive the pawl assembly (300) and the main gear (230) cooperate; Control assembly (100), movably connected to the base (500), the control assembly (100) can be moved between the avoiding position and the driving position relative to the base (500), when the control assembly (100) is in the avoiding position, the control assembly (100) is spaced apart from the pawl assembly (300), when the control assembly (100) is in the driving position, the control assembly (100) pushes the pawl assembly (300) and the main gear (230) apart, so that the pawl assembly (300) and the main gear (230) are spaced apart.

2. The gear pawl drive of claim 1, wherein, The control assembly (100) includes self-locking release (110), the self-locking release (110) has rotating part and contact part fixed on the rotating part, the self-locking release (110) can rotate about the axis of the rotating part relative to the base (500), when the control assembly (100) is in the driving position, the contact part pushes the pawl assembly (300).

3. The gear pawl drive of claim 2, wherein, The control assembly (100) further includes retaining ring (120), the retaining ring (120) is clamped on the rotating part, the rotating part passes through the base (500) and is rotatably connected with the base (500), the retaining ring (120) and the contact part are attached to the base (500) from both sides, so that the rotating part is axially stopped on the base (500).

4. The gear pawl drive of claim 2, wherein, The contact part is an elliptic cylinder, the elliptic cylinder is coaxial with the rotating part, when the control assembly (100) is in the driving position, the major axis of the elliptic cylinder is perpendicular to the length direction of the pawl assembly (300).

5. The gear pawl drive of claim 1, wherein, The pawl assembly (300) comprises a pawl body (310), a pin shaft (320) and a positioning pin (330), one end of the pawl body (310) is used for contacting the main gear (230), the other end is fixedly connected with the pin shaft (320), the pin shaft (320) is movably connected to the base (500), and the pin shaft (320) can rotate relative to the base (500) around the axis of the pin shaft (320), the positioning pin (330) is fixedly connected to the middle part of the pawl body (310), and the end of the elastic member (400) is fixed to the positioning pin (330).

6. The gear pawl drive of claim 5, wherein, The control assembly (100), the transmission assembly (200) and the elastic member (400) are located on the same side of the pawl body (310).

7. The gear pawl drive of claim 1, wherein, The transmission assembly (200) further comprises a rotating bearing (250), the inner ring of the rotating bearing (250) is sleeved on the transmission shaft (210), the outer ring of the rotating bearing (250) is fixedly connected to the base (500), and the main gear (230) is axially fixed between the inner ring of the rotating bearing (250) and the locking member (220).

8. The gear pawl drive of claim 7, wherein, The transmission assembly (200) further comprises a bearing retainer (240), the bearing retainer (240) is sleeved on the transmission shaft (210) and clamped between the inner ring of the rotating bearing (250) and the main gear (230).

9. The gear pawl drive of claim 1, wherein, The tooth shape of the main gear (230) is involute tooth shape, and the tooth shape of the pawl assembly (300) is involute tooth shape.

10. The gear pawl transmission mechanism according to any one of claims 1 to 9, characterized in that, The external transmission member is a driven gear (910), the main gear (230) and the driven gear (910) are conjugatedly engaged, so as to drive the driven gear (910) to rotate around the axis of the driven gear (910); or, The external transmission member is a rack (920), the main gear (230) and the rack (920) are conjugatedly engaged, so as to drive the rack (920) to move along the length direction of the rack (920). The transmission assembly (200) further comprises a rotating bearing (250), the inner ring of the rotating bearing (250) is sleeved on the transmission shaft (210), the outer ring of the rotating bearing (250) is fixedly connected to the base (500), and the main gear (230) is axially fixed between the inner ring of the rotating bearing (250) and the locking member (220). The transmission assembly (200) further comprises a bearing retainer (240), the bearing retainer (240) is sleeved on the transmission shaft (210) and clamped between the inner ring of the rotating bearing (250) and the main gear (230). The tooth shape of the main gear (230) is involute tooth shape, and the tooth shape of the pawl assembly (300) is involute tooth shape. The external transmission member is a driven gear (910), the main gear (230) and the driven gear (910) are conjugatedly engaged, so as to drive the driven gear (910) to rotate around the axis of the driven gear (910); or, The external transmission member is a rack (920), the main gear (230) and the rack (920) are conjugatedly engaged, so as to drive the rack (920) to move along the length direction of the rack (920).

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