CN220082661U - Anti-backlash structure of rotary driving mechanism - Google Patents

Abstract

The utility model provides a gap eliminating structure of rotary driving mechanism, includes assembly casing and one-level worm, is connected with the regulation bearing frame in the assembly casing, and the regulation bearing is installed to one side that the regulation bearing frame is close to one-level worm, and the inner race of regulation bearing cup joints in one-level worm, and one side that the regulation bearing frame kept away from one-level worm is installed and is prevented scurring the gasket and is used for pushing away the scurring the gasket to the scurring spring of preventing of one-level worm, and the tip of one-level worm is coniform or globular and butt to preventing scurring the gasket. According to the scheme, due to the arrangement of the anti-channeling spring in the adjusting bearing seat, the anti-channeling gasket is always pushed to the primary worm, so that even if axial channeling occurs in the rotation process of the primary worm, the anti-channeling gasket can reset under the pushing action of the anti-channeling gasket, and stable rotation and subsequent transmission of the primary worm are realized; in addition, because the end part of the primary worm is conical or spherical, the primary worm is in point contact with the anti-channeling gasket, and the abrasion problem can be effectively avoided.

Description

Anti-backlash structure of rotary driving mechanism

Technical Field

The utility model relates to the field of driving devices for display screen movement, in particular to a gap eliminating structure of a rotary driving mechanism.

Background

With the recent intelligent upgrade of the automobile industry, more and more vehicles are equipped with intelligent display screens in center consoles. The vehicle-mounted intelligent display screen has a plurality of functions of displaying automobile states, navigation information, communication information and the like, and provides a lot of convenience for drivers.

Considering that the fixed display screen cannot simultaneously take the interaction experience of the main driving and the auxiliary driving, how to realize the rotary driving of the vehicle-mounted display screen becomes a research hot spot, and various rotary driving devices of the vehicle-mounted display screen are also on the market at present. Most of the existing display screen rotation driving devices drive a driving shaft to rotate through a motor driving reduction mechanism, and finally, angle adjustment of the display screen is realized.

However, due to the inside of the reduction mechanism and the presence of the assembly gap between the motor, the reduction mechanism and the drive shaft, the driving action of the motor on the drive shaft tends to be unstable, which not only results in easy shaking of the display screen and failure of accurate adjustment, but also aggravates the problem of abrasion inside the reduction mechanism.

Disclosure of Invention

The utility model aims to provide a gap eliminating structure of a rotary driving mechanism, which can effectively eliminate assembly gaps and is stable and reliable in operation.

In order to solve the problems, the utility model provides a clearance eliminating structure of a rotary driving mechanism, which comprises an assembly shell and a primary worm, wherein an adjusting bearing seat is connected in the assembly shell, an adjusting bearing is arranged on one side, close to the primary worm, of the adjusting bearing seat, an inner ring of the adjusting bearing is sleeved on the primary worm, a channeling preventing gasket and a channeling preventing spring for pushing the channeling preventing gasket to the primary worm are arranged on one side, far away from the primary worm, of the adjusting bearing seat, and the end part of the primary worm is conical or spherical and is abutted to the channeling preventing gasket.

According to the scheme, the first-stage worm is connected with the assembly shell in a rotating way through the adjusting bearing, meanwhile, due to the arrangement of the anti-channeling spring in the adjusting bearing seat, the anti-channeling gasket is always pushed to the first-stage worm, namely, the anti-channeling gasket and the end part of the first-stage worm are guaranteed to be in an abutting state, so that even if axial channeling occurs in the rotating process of the first-stage worm, the first-stage worm is reset under the pushing action of the anti-channeling gasket, and stable rotation and subsequent transmission of the first-stage worm are realized; in addition, because the end part of the primary worm is conical or spherical, the primary worm is in point contact with the anti-channeling gasket, and the abrasion problem can be effectively avoided.

Preferably, a spherical annular groove is formed in one side, close to the primary worm, of the adjusting bearing seat, and the outer ring of the adjusting bearing is spherical and is rotationally connected to the spherical annular groove, so that the adjusting bearing can realize automatic centering under the action of the spherical annular groove in the primary worm rotation process, and the deflection problem of the primary worm is avoided.

Preferably, the scheme further comprises a motor and a primary worm gear, the motor is fixedly connected to the assembly shell, an output shaft of the motor is coaxially connected with the primary worm gear, the primary worm gear is rotatably arranged in the assembly shell, and the primary worm gear is meshed with the primary worm gear, so that power transmission is achieved.

Preferably, the above scheme further comprises a secondary worm and a driving shaft member, wherein the secondary worm is rotationally connected in the assembly shell, the primary worm wheel is coaxially connected with the secondary worm, the driving shaft member comprises a driving shaft body and a driving worm wheel which are coaxially connected, the secondary worm is meshed with the driving worm wheel, and therefore power transmitted by the motor can be transmitted to the driving shaft member after secondary speed reduction.

Preferably, the rod end of the secondary worm, which is close to the driving worm wheel, is sleeved with a first bearing, the outer ring of the first bearing is installed in the assembly shell, the assembly shell is provided with a first spring acting on the first bearing, the first spring is used for pushing the first bearing to the driving worm wheel, the first spring can generate radial thrust to the first bearing, and meshing stability of the secondary worm and the driving worm wheel is guaranteed.

Preferably, the rod end of the secondary worm, which is close to the primary worm, is sleeved with a second bearing, the outer ring of the second bearing is installed in the assembly shell, a stepped shaft section with the increased rod diameter is arranged at a position, adjacent to the second bearing, of the secondary worm, a wave washer and an equal-height washer are sleeved at a position, located between the stepped shaft section and the second bearing, of the secondary worm, one side of the wave washer is abutted to the stepped shaft section, the other side of the wave washer is abutted to one side of the equal-height washer, and the other side of the equal-height washer is abutted to the side face of the inner ring of the second bearing. The arrangement of the wave washer is beneficial to eliminating the axial movement of the secondary worm, and the arrangement of the equal-height washer separates the wave washer and the second bearing from each other, so that the abrasion problem is effectively avoided.

Drawings

FIG. 1 is a schematic view of an anti-backlash mechanism of a rotary drive mechanism according to the present utility model;

FIG. 2 is a schematic view of a housing of a eliminating assembly of an anti-backlash mechanism of a rotary driving mechanism according to the present utility model;

FIG. 3 is a schematic top view of a rear housing of a blank assembly housing of a rotary drive mechanism of the present utility model;

FIG. 4 is a schematic cross-sectional view taken along section line A-A in FIG. 3;

FIG. 5 is a schematic cross-sectional view taken along section line B-B in FIG. 3;

FIG. 6 is a schematic cross-sectional view taken along section line C-C of FIG. 3;

FIG. 7 is a schematic cross-sectional view taken along section line D-D in FIG. 3;

FIG. 8 is a schematic view of the assembly housing and drive shaft member of the anti-backlash mechanism of the rotary drive mechanism of the present utility model in a bottom view;

FIG. 9 is a schematic view of a drive shaft body of an anti-backlash mechanism of a rotary drive mechanism according to the present utility model;

fig. 10 is a schematic view illustrating a bottom view of a rotating bracket of an embodiment 2 of an anti-backlash structure of a rotation driving mechanism according to the present utility model;

fig. 11 is an overall schematic diagram of an embodiment 2 of a backlash eliminating structure of a rotary driving mechanism according to the present utility model.

The reference numerals are used to describe the components,

a1, an assembly shell; a11, a front shell; a111, a clamping groove; a12, a rear shell; a121, a baffle; a13, a shaft seat; a131, slotting; a2, adjusting a bearing seat; a21, a spherical annular groove; a3, adjusting a bearing;

a4, an anti-channeling gasket; a41, a channeling-preventing spring; a5, a first bearing; a51, a first spring; a6, a second bearing; a61, a wave washer; a62, a contour washer; a7, installing a bearing; a71, a nut cover; b1, driving shaft member; b11, limiting blocks; b12, driving a shaft body; b121, positioning groove; b122, slot; c1, a power piece; c11, a motor; c111, magnetic ring; c112, hall plate; c12, a primary worm; c13, a first-stage worm wheel; c14, a secondary worm; c141, a stepped shaft section; c15, driving a worm wheel; d1, rotating a bracket; d11, a sleeve; d12, an installation part; d13, a coupling buffer sleeve; e1, a base bracket; e11, an assembling part; f1, a sensor; g1, a wire harness sleeve; and g12, buckling.

Detailed Description

In order that the above objects, features and advantages of the present utility model will be readily apparent, a more particular description of the utility model briefly described above will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which, as illustrated in the appended drawings, it is to be understood that the embodiments described are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. It should be further noted that, in the embodiments of the present utility model, all directional indications (such as up, down, left, right, front, back, inner, and outer) are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is correspondingly changed.

Example 1

Referring to fig. 1-9, an anti-backlash structure of a rotation driving mechanism provided by the embodiment of the utility model comprises an assembly housing a1 and a primary worm c12, wherein an adjusting bearing seat a2 is connected in the assembly housing a1, an adjusting bearing a3 is installed on one side of the adjusting bearing seat a2 close to the primary worm c12, an inner ring of the adjusting bearing a3 is sleeved on the primary worm c12, an anti-backlash gasket a4 and an anti-backlash spring a41 for pushing the anti-backlash gasket a4 to the primary worm c12 are installed on one side of the adjusting bearing seat a2 far away from the primary worm c12, and the end part of the primary worm c12 is conical or spherical and is abutted to the anti-backlash gasket a4.

According to the scheme, the first-stage worm c12 is connected with the assembly shell a1 in a rotating way through the adjusting bearing a3, meanwhile, due to the arrangement of the anti-channeling spring a41 in the adjusting bearing seat a2, the anti-channeling gasket a4 is always pushed to the first-stage worm c12, namely, the end part of the anti-channeling gasket a4 and the end part of the first-stage worm c12 are in an abutting state, so that even if axial movement occurs in the rotating process of the first-stage worm c12, the first-stage worm c12 is reset under the abutting action of the anti-channeling gasket a4, and stable rotation and subsequent transmission of the first-stage worm c12 are realized; in addition, the end part of the primary worm c12 is conical or spherical, so that the primary worm c12 is in point contact with the anti-channeling gasket a4, and the abrasion problem can be effectively avoided.

In this embodiment, a spherical annular groove a21 is disposed on one side of the adjusting bearing seat a2, which is close to the primary worm c12, and an outer ring of the adjusting bearing a3 is spherical and rotationally connected to the spherical annular groove a21, so that the adjusting bearing a3 can realize automatic centering under the action of the spherical annular groove a21 in the rotation process of the primary worm c12, and the deflection problem of the primary worm c12 is avoided.

Further, the scheme further comprises a motor c11, a primary worm wheel c13, a secondary worm c14 and a driving shaft member b1, wherein the motor c11 is fixedly connected to the assembly shell a1, an output shaft of the motor c11 is coaxially connected with the primary worm wheel c12, the primary worm wheel c13 is rotatably arranged in the assembly shell a1, and the primary worm wheel c12 is meshed with the primary worm wheel c13, so that power transmission is achieved. The secondary worm c14 is rotatably connected in the assembly shell a1, the primary worm wheel c13 is coaxially connected with the secondary worm c14, the driving shaft member b1 comprises a driving shaft body b12 and a driving worm wheel c15 which are coaxially connected, the secondary worm c14 is meshed with the driving worm wheel c15, and therefore power transmitted by the motor c11 can be transmitted to the driving shaft member b1 after secondary speed reduction.

As an optimization of the above embodiment, the rod end of the secondary worm c14, which is close to the driving worm wheel c15, is sleeved with the first bearing a5, the outer ring of the first bearing a5 is installed in the assembly housing a1, the assembly housing a1 is provided with the first spring a51 acting on the first bearing a5, one end of the first spring a51 is abutted to the assembly housing a1, the other end of the first spring a51 is abutted to the first bearing a5, the first spring a51 is used for pushing the first bearing a5 to the driving worm wheel c15, and the arrangement of the first spring a51 can generate radial thrust on the first bearing a5, so that the meshing stability of the secondary worm c14 and the driving worm wheel c15 is ensured.

As an optimization of the above embodiment, the rod end of the secondary worm c14 near the primary worm c12 is sleeved with the second bearing a6, the outer ring of the second bearing a6 is installed in the assembly housing a1, a stepped shaft section c141 with an increased rod diameter is arranged at a position of the secondary worm c14 adjacent to the second bearing a6, a wave washer a61 and a contour washer a62 are sleeved at a position of the secondary worm c14 between the stepped shaft section c141 and the second bearing a6, one side of the wave washer a61 is abutted to the stepped shaft section c141 and the other side is abutted to one side of the contour washer a62, and the other side of the contour washer a62 is abutted to the side surface of the inner ring of the second bearing a 6. The arrangement of the wave washer a61 is beneficial to eliminating the axial movement of the secondary worm c14, while the arrangement of the equal-height washer a62 separates the wave washer a61 and the second bearing a6 from each other, so that the abrasion problem is effectively avoided.

Example 2

Referring to fig. 1-11, an embodiment of the utility model provides a rotation driving mechanism, which includes an assembly housing a1, a driving shaft b1, a sensor f1 and a power member c1, wherein the assembly housing a1 is provided with a shaft seat a13, the driving shaft b1 is rotatably connected to the shaft seat a13, the power member c1 is connected to the assembly housing a1 and acts on the driving shaft b1 to control rotation of the driving shaft b1, a slot a131 is arranged along a transverse direction on a sidewall of the shaft seat a13, the driving shaft b1 is provided with a limiting block b11 protruding along a radial direction, the limiting block b11 extends to the slot a131, the slot a131 is used for limiting a moving range of the limiting block b11, and the sensor f1 is connected to the assembly housing a1 and is used for detecting a position of the limiting block b 11.

In the above scheme, the driving shaft member b1 is rotatably connected in the shaft seat a13, and the movement range of the limiting block b11 is limited by the slot a131, so that the maximum rotation angle of the driving shaft member b1 is limited by the slot a131, and the problem of damage caused by overlarge rotation angle when the display screen is driven by the driving shaft member b1 is effectively avoided; meanwhile, the position of the limiting block b11 can be detected through the arrangement of the sensor f1, and the driving shaft piece b1 can be calibrated again when the deviation problem occurs, so that the feedback adjusting function is realized.

It should be noted that the above-described scheme can be applied to any scene where the rotational driving is required to be achieved by the driving shaft body b12 alone, and in the present embodiment, the above-described scheme is applied to the rotational driving of the display screen. Specifically, in the present embodiment, a rotating bracket d1 and a base bracket e1 are also included, the rotating bracket d1 including a sleeve d11 for connection to the drive shaft member b1 and a mounting portion d12 for mounting the display screen, the base bracket e1 being provided with an assembling portion e11 for mounting the assembly housing a 1. The sleeve d11 and the driving shaft element b1 are preferably sleeved, and the sleeve d11 and the driving shaft element b1 can be connected through a key slot or a bolt so as to realize circumferential fixation; the assembly portion e11 is in a groove shape in the present embodiment, so that the assembly housing a1 is embedded and assembled.

In this embodiment, the shaft seat a13 is a cylindrical structure disposed vertically, and an opening is disposed at an upper portion of the shaft seat a13, so that the driving shaft b1 and a corresponding fitting, in this embodiment, the rotating bracket d1, are assembled. The slot a131 is transversely arranged in the middle of the side wall of the shaft seat a13, one end of the limiting block b11 is connected with the driving shaft body b12, and the other end of the limiting block b extends out of the slot a131 to the outer side of the shaft seat a 13. When the driving shaft member b1 rotates, the stopper b11 slides with respect to the slot a131, and when the stopper b11 abuts against the left or right side wall of the slot a131, the maximum rotation angle of the driving shaft member b1 is reached. The sensor f1 is preferably a contact sensor f1, the sensor f1 is fixedly mounted on the left side wall or the right side wall of the assembly housing a1, which is close to the slot a131, and the probe of the sensor f1 is located in the moving path of the limiting block b 11.

When the device is used, the driving shaft body b12 rotates around the vertical axis under the driving action of the motor c11 of the power piece c1, and under normal working conditions, the rotation angle and the rotation direction of the driving shaft body b12 can be controlled by controlling the pulse number and the rotation direction of the motor c 11; when the deviation occurs between the driving shaft body b12 and the motor c11 due to the false touch, the motor c11 can control the driving shaft body b12 to rotate until the sensor f1 is triggered by the limiting block b11, at this time, the actual angle of the driving shaft body b12 can be obtained, and the reference angle of the motor c11 to the driving shaft body b12 can be redetermined.

In this embodiment, the power component c1 includes a motor c11, a primary worm c12, a primary worm wheel c13 and a secondary worm c14, the motor c11 is fixedly connected to the assembly housing a1, an output shaft of the motor c11 is coaxially connected with the primary worm c12, the secondary worm c14 is rotatably connected in the assembly housing a1, the primary worm wheel c13 is coaxially connected with the secondary worm c14, the driving shaft component b1 includes a driving shaft body b12 and a driving worm wheel c15 which are coaxially connected, the primary worm c12 is meshed with the primary worm wheel c13, and the secondary worm c14 is meshed with the driving worm wheel c15, so that the overall structure is compact and reliable, and the power output by the motor c11 can be stably transmitted to the driving shaft body b12 after being decelerated. It should be noted that, the coaxial connection between the primary worm wheel c13 and the secondary worm c14 means that the head end of the secondary worm c14 is provided with worm teeth and the tail end is in an optical axis shape, and the primary worm wheel c13 is adjusted to the tail end of the secondary worm c14, so as to realize synchronous rotation of the primary worm wheel c13 and the secondary worm c 14.

Further, the output shaft of the motor c11 comprises a head end extending to the front side of the motor c11 and a tail end extending to the rear side of the motor c11, the primary worm c12 is connected to the head end of the output shaft, the tail end of the output shaft is connected with the magnetic ring c111, the rear side of the motor c11 is attached with the Hall plate c112, and the Hall plate c112 is arranged opposite to the magnetic ring c 111. By adopting the structure, the integrated assembly of the Hall plate c112 and the motor c11 is realized, the subsequent assembly steps are simplified, and the space layout is more compact and reasonable; the Hall plate c112 is used as a Hall sensor f1, and the rotating speed of the output shaft of the motor c11 can be obtained by detecting the magnetic ring c111, so that the rotating speed of the motor c11 can be conveniently fed back and adjusted.

Further, the rotary driving mechanism of the embodiment further includes a backlash eliminating mechanism, specifically, an adjusting bearing seat a2 is connected in the assembly housing a1, a spherical annular groove a21 is formed in one side, close to the primary worm c12, of the adjusting bearing seat a2, an adjusting bearing a3 is installed in the spherical annular groove a21, a channeling preventing gasket a4 and a channeling preventing spring a41 are installed on one side, far away from the primary worm c12, of the adjusting bearing seat a2, one end of the channeling preventing spring a41 is abutted to the channeling preventing gasket a4, the other end of the channeling preventing spring a41 is abutted to the adjusting bearing seat a2, and the channeling preventing spring a41 is used for pushing the channeling preventing gasket a4 to the primary worm c12. The outer ring of the adjusting bearing a3 is spherical and rotationally connected to the spherical annular groove a21, the inner ring of the adjusting bearing a3 is sleeved on one side, far away from the motor c11, of the primary worm c12, the end, far away from the motor c11, of the primary worm c12 is conical or spherical and is abutted to the anti-channeling gasket a4, the spherical annular groove a21 and the adjusting bearing a3 can achieve the aligning effect on the primary worm c12, and the arrangement of the anti-channeling gasket a4 and the anti-channeling spring a41 is beneficial to eliminating the axial movement of the primary worm c12, so that the rotation of the primary worm c12 in the assembly shell a1 is ensured to be more stable.

As an optimization of the above embodiment, the rod end of the secondary worm c14, which is close to the driving worm wheel c15, is sleeved with the first bearing a5, the outer ring of the first bearing a5 is installed in the assembly housing a1, the first spring a51 acting on the first bearing a5 is arranged in the assembly housing a1, one end of the first spring a51 is abutted to the assembly housing a1, the other end of the first spring a51 is abutted to the first bearing a5, the first spring a51 is used for pushing the first bearing a5 to the driving worm wheel c15, and the arrangement of the first spring a51 can generate radial thrust on the first bearing a5, so that the meshing stability of the secondary worm c14 and the driving worm wheel c15 is ensured.

As an optimization of the above embodiment, the rod end of the secondary worm c14 near the primary worm c12 is sleeved with the second bearing a6, the outer ring of the second bearing a6 is installed in the assembly shell a1, a stepped shaft section c141 with an increased rod diameter is arranged at a position of the secondary worm c14 adjacent to the second bearing a6, a wave washer a61 and an equal-height washer a62 are sleeved at a position of the secondary worm c14 between the stepped shaft section c141 and the second bearing a6, one side of the wave washer a61 is abutted to the stepped shaft section c141 and the other side is abutted to one side of the equal-height washer a62, the other side of the equal-height washer a62 is abutted to the side surface of the inner ring of the second bearing a6, and the arrangement of the wave washer a61 is beneficial to eliminating axial play of the secondary worm c14, and the arrangement of the equal-height washer a62 separates the wave washer a61 and the second bearing a6 from each other, so that the abrasion problem is effectively avoided.

In this embodiment, the driving shaft b12 is provided with a coupling section, a plurality of positioning grooves b121 distributed along the circumferential direction are formed in the position of the side wall of the driving shaft b12 located at the coupling section, and the driving worm wheel c15 is integrally connected to the coupling section through a plastic coating process, so that an integral structure is formed between the driving shaft b12 and the driving worm wheel c15, the generation of assembly gaps is avoided, and the driving effect of the driving worm wheel c15 on the driving shaft b12 is ensured to be more stable and accurate. In this embodiment, the drive shaft body b12 is rotatably connected to the inside of the shaft seat a13 by means of two mounting bearings a7, while the coupling section is located between the two mounting bearings a7. The bottom of the shaft seat a13 is fitted with a nut cover a71 in an interference fit, the nut cover a71 abutting in an interference fit against a mounting bearing a7 located below the drive worm wheel c 15. In the present embodiment, the stopper b11 is integrally connected to the side surface of the driving worm wheel c15, and of course, the stopper b11 may be connected to the side wall of the driving shaft b12.

As an optimization of the above embodiment, the inner cylinder wall of the sleeve d11 of the rotating bracket d1 is connected with a plurality of coupling buffer sleeves d13 distributed along the circumferential direction, the side wall of the coupling buffer sleeve d13 surrounds rubber or similar flexible materials, a plurality of slots b122 distributed along the circumferential direction are arranged at the end part of the driving shaft element b1 towards the sleeve d11, the slots b122 correspond to the coupling buffer sleeves d13 one by one, the coupling buffer sleeves d13 are inserted into the corresponding slots b122 one by one in an interference fit manner, so that stable connection between the driving shaft element b1 and the rotating bracket d1 is realized, and the driving effect of the driving shaft element b1 on the rotating bracket d1 is ensured to be more stable.

In this embodiment, the assembly casing a1 includes front casing a11 and back casing a12, and the lateral wall of front casing a11 is equipped with draw-in groove a111, and front casing a11 and back casing a12 are detachable each other and are connected, and back casing a12 is equipped with the separation blade a121 that seals the notch of draw-in groove a111, and the pencil cover g1 of wire is equipped with the buckle g12 that is used for the joint to the draw-in groove a111 to guarantee that the wire of motor c11 or display screen can be fixed in draw-in groove a111 through the buckle g12 on the pencil cover g1, the overall arrangement is more reasonable, and easy dismounting and maintenance.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.

Claims (5)

1. The anti-backlash structure of the rotary driving mechanism is characterized by comprising an assembly shell (a 1) and a primary worm (c 12), wherein an adjusting bearing seat (a 2) is connected in the assembly shell (a 1), an adjusting bearing (a 3) is arranged on one side, close to the primary worm (c 12), of the adjusting bearing seat (a 2), an inner ring of the adjusting bearing (a 3) is sleeved on the primary worm (c 12), an anti-backlash gasket (a 4) and an anti-backlash spring (a 41) for pushing the anti-backlash gasket (a 4) to the primary worm (c 12) are arranged on one side, far away from the primary worm (c 12), of the adjusting bearing seat (a 2), and the end part of the primary worm (c 12) is conical or spherical and is abutted to the anti-backlash gasket (a 4);

one side of the adjusting bearing seat (a 2) close to the primary worm (c 12) is provided with a spherical annular groove (a 21), and the outer ring of the adjusting bearing (a 3) is spherical and rotationally connected with the spherical annular groove (a 21).

2. The backlash eliminating structure of a rotary driving mechanism according to claim 1, further comprising a motor (c 11) and a primary worm wheel (c 13), wherein the motor (c 11) is fixedly connected to the assembly housing (a 1), an output shaft of the motor (c 11) is coaxially connected with a primary worm (c 12), the primary worm wheel (c 13) is rotatably arranged in the assembly housing (a 1), and the primary worm (c 12) is meshed with the primary worm wheel (c 13).

3. The backlash eliminating structure of a rotary driving mechanism according to claim 2, further comprising a secondary worm (c 14) and a driving shaft member (b 1), wherein the secondary worm (c 14) is rotatably connected in the assembly housing (a 1), the primary worm wheel (c 13) is coaxially connected with the secondary worm (c 14), the driving shaft member (b 1) comprises a driving shaft body (b 12) and a driving worm wheel (c 15) which are coaxially connected, and the secondary worm (c 14) is meshed with the driving worm wheel (c 15).

4. A backlash eliminating structure for a rotary drive mechanism as defined in claim 3, characterized in that a rod end of the secondary worm (c 14) close to the drive worm wheel (c 15) is sleeved with a first bearing (a 5), an outer ring of the first bearing (a 5) is installed in the assembly housing (a 1), the assembly housing (a 1) is provided with a first spring (a 51) acting on the first bearing (a 5), and the first spring (a 51) is used for pushing the first bearing (a 5) to the drive worm wheel (c 15).

5. A backlash eliminating structure of a rotary driving mechanism according to claim 3, characterized in that a rod end of the secondary worm (c 14) close to the primary worm (c 12) is sleeved with a second bearing (a 6), an outer ring of the second bearing (a 6) is mounted in the assembly housing (a 1), a stepped shaft section (c 141) with an increased rod diameter is provided at a position adjacent to the second bearing (a 6) of the secondary worm (c 14), a wave washer (a 61) and an equal-height washer (a 62) are sleeved at a position between the stepped shaft section (c 141) and the second bearing (a 6) of the secondary worm (c 14), one side of the wave washer (a 61) is abutted to the stepped shaft section (c 141) and the other side of the wave washer (a 62) is abutted to one side of the inner ring of the second bearing (a 6).