Adjustment device for tooth-to-tooth gap between worm gear and worm, and steering transmission mechanism

Abstract

An adjustment device for a tooth-to-tooth gap between a worm gear and a worm, and a steering transmission mechanism. The adjustment device (100) for a tooth-to-tooth gap between a worm gear and a worm comprises: a worm (10), which can rotate around a first central axis (O1); a worm gear (20), which can rotate around a second central axis (O2) and engages with the worm (10); and an adjustment sleeve (30), which is sleeved outside the worm (10), allows the worm (10) to rotate therein around the first central axis (O1), and is arranged eccentric to the worm (10). The position of the worm changes along with the rotation of the adjustment sleeve, such that the center distance between the worm and the worm gear changes, thereby achieving rapid adjustment of a tooth-to-tooth gap between the worm and the worm gear.

Description

Worm gear tooth clearance adjustment device and steering transmission mechanism Technical Field

[0001] The present invention relates to the technical field of vehicle power steering, and in particular to a worm gear clearance adjusting device and a steering transmission mechanism for a vehicle steering system. Background Art

[0002] Currently, commercial vehicle steering systems generally utilize electric hydraulic power steering (EHPS), which utilizes a combination of electric and hydraulic power steering. The primary transmission mechanism in an EHPS is a worm gear. The backlash between the worm wheel and worm gear significantly impacts transmission efficiency and noise.

[0003] Since the worm gear power transmission mechanism is fixedly installed in the housing, the installed worm gear will produce two coordination effects:

[0004] If the center distance is too small and the tooth clearance is too small, the worm gear will be too tightly engaged, the tooth surfaces of the worm gear will be squeezed together, the friction will increase, the transmission efficiency will be reduced, and the wear of the tooth surfaces of the worm gear will be aggravated.

[0005] When the center distance is too large and the tooth clearance is too large, the worm gear will be too loose in meshing, and there will be clearance on the tooth surface of the worm gear. When the worm gear changes direction, the worm gear needs to be transmitted for a certain angle before it can complete the gap, and then it will instantly contact the worm gear. The impact will cause noise and affect the life of the tooth surface.

[0006] In related technologies, the tooth clearance adjustment mechanism usually takes the form of adjusting the position of the bearing at the tail end of the worm. Adjusting the position of the bearing at the front end of the worm will cause the central axis of the worm to be offset, so that there is an angle between the center line of the motor output shaft and the center axis of the worm. In this way, the torque and speed transmitted to the worm by the motor will fluctuate, thereby affecting the torque and speed output of the worm wheel, and ultimately the driver's steering feel and stability will be affected.

[0007] Summary of the Invention

[0008] In order to overcome the problems existing in the related art, the present disclosure provides a worm gear tooth clearance adjustment device and a steering transmission mechanism.

[0009] According to a first aspect of an embodiment of the present disclosure, a worm gear tooth clearance adjustment device is provided, comprising: a worm, rotatable around a first center axis; a worm wheel, rotatable around a second center axis and meshing with the worm; and an adjusting sleeve, sleeved on the outside of the worm and allowing the worm to rotate around the first center axis within the adjusting sleeve, wherein the adjusting sleeve is eccentrically arranged with respect to the worm, and by rotating the adjusting sleeve, the position of the first center axis of the worm is changed to adjust the center distance between the first center axis and the second center axis of the worm wheel, thereby realizing tooth clearance adjustment between the worm and the worm wheel.

[0010] In some embodiments, a flange is provided at the end of the adjustment sleeve, and the flange is provided with a first waist-shaped hole extending in the circumferential direction. The worm gear tooth clearance adjustment device also includes a reducer housing, and the adjustment sleeve is located in the reducer housing; wherein, the adjustment sleeve can always be fixedly connected to the reducer housing through the first waist-shaped hole within a preset rotation range.

[0011] In some embodiments, the worm gear tooth clearance adjustment device also includes: a motor housing, a threaded hole is provided at the end of the motor housing; a motor output shaft is located in the motor housing, and is used to be connected to the worm gear transmission, and the position of the motor housing is changed by adjusting the motor output shaft to be coaxially aligned with the worm gear, wherein a connecting plate is provided at the end of the reducer housing, and a second waist-shaped hole extending along the circumferential direction is provided on the connecting plate, and after the position of the motor housing is changed, the second waist-shaped hole always covers the threaded hole in the circumferential direction.

[0012] In some embodiments, the outer wall of the adjustment sleeve matches the inner wall of the housing, and before the adjustment sleeve is fixed to the housing, the adjustment sleeve can rotate around the third central axis in the housing.

[0013] In some embodiments, the worm includes a front bearing and a rear bearing, which are respectively mounted on both ends of the worm, and are used to enable the worm to rotate around the first center axis in the adjustment sleeve and make the first center axis parallel to the third center axis.

[0014] In some embodiments, an opening is provided in the middle of the adjusting sleeve for allowing the worm in the adjusting sleeve to contact and engage with the worm wheel.

[0015] In some embodiments, the worm gear tooth clearance adjustment device further includes a plum blossom coupling flexibly and rigidly connected between the worm and the motor output shaft.

[0016] In some embodiments, two first waist-shaped holes are provided on the circumference of the flange.

[0017] In some embodiments, two second waist-shaped holes are provided on the circumference of the connecting plate of the reducer housing.

[0018] According to a second aspect of an embodiment of the present disclosure, the present disclosure provides a steering transmission mechanism applied to a steering transmission system of a vehicle, comprising: a worm gear tooth clearance adjustment device as described in the first aspect.

[0019] The technical solutions provided by the embodiments of the present disclosure can provide the following beneficial effects: the third central axis of the adjustment sleeve is parallel to and offset from the first central axis of the worm, and the spacing between the third central axis of the adjustment sleeve and the second central axis of the worm wheel remains unchanged. The first central axis of the worm wheel changes position as the adjustment sleeve rotates about the third central axis, thereby changing the center distance between the worm and the worm wheel. Compared to conventional backlash adjustment devices, the present worm gear backlash adjustment device eliminates the need for adjustment springs, adjustment bolts, and custom self-aligning bearings, resulting in a simplified and streamlined structure, easy installation and disassembly, and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0021] FIG1 is a cross-sectional view of a worm gear tooth clearance adjustment device according to an exemplary embodiment;

[0022] FIG2 is a schematic diagram of a combined structure of a worm and an adjusting sleeve according to an exemplary embodiment;

[0023] FIG3 is a cross-sectional view of a worm, a worm wheel, and an adjusting sleeve according to an exemplary embodiment;

[0024] FIG4 is a schematic structural diagram of an adjusting sleeve flange plate according to an exemplary embodiment;

[0025] FIG5 is a schematic diagram showing the positional relationship among an adjustment sleeve, a worm and a reducer housing according to an exemplary embodiment;

[0026] FIG6 is a schematic structural diagram of a second waist-shaped hole of a reducer housing according to an exemplary embodiment. DETAILED DESCRIPTION

[0027] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0028] In the present invention, the front end of the worm refers to the end away from the motor, such as the left side in Figures 1, 2 and 3, and the rear end of the worm refers to the end close to the motor, such as the right side in Figures 1, 2 and 3. In addition, "transmission connection" means that the driving force / torque can be transmitted between two components, and the two components can be directly connected or through various transmission mechanisms or connection structures to achieve the above functions. "Anti-torque connection" means that torque can be transmitted between two components, and the methods for achieving anti-torque connection can include interference fit and bolt connection, etc.

[0029] In the related art, there are many solutions for adjusting the tooth clearance of worm gears used in vehicle steering systems. Vehicles include passenger cars and commercial vehicles. The operating conditions of worm gears used in passenger cars and commercial vehicles are different.

[0030] The steering of commercial vehicles mainly relies on hydraulic power steering, and the force required for the worm gear in the electric power steering is very small, so the wear is small enough to be ignored. Therefore, the self-adjusting structure of passenger cars can be omitted. Instead, the meshing state can be adjusted during product assembly.

[0031] The steering of a passenger car is basically achieved by the torque amplified by the worm gear driven by the motor. The meshing force between the worm gear is relatively large and wears quickly, so a self-adjusting function is required. The position of the front-end bearing is adjusted by tightening the spring. After the worm gear has worked for a period of time, it will wear out. At this time, the spring will release the elastic force, pressing the front-end bearing on the worm, driving the worm against the worm wheel, eating up the gap caused by wear, and keeping the worm gear in a good meshing state at all times. However, this method of using adjustment springs in passenger cars has many parts, a complex structure, and is not easy to assemble and install.

[0032] To solve the above technical problems, the present disclosure provides a worm gear tooth clearance adjustment device 100. As shown in Figure 1, the worm gear tooth clearance adjustment device 100 at least includes a reducer housing 40 and a worm 10, a worm wheel 20 and an adjustment sleeve 30 located in the reducer housing 40.

[0033] The worm 10 can rotate around the first center axis O1, and the worm wheel 20 can rotate around the second center axis O2 which is eccentric and perpendicular to the first center axis O1. Therefore, the engagement of the worm wheel 20 and the worm 10 can perform positive exchange of the torque transmitted by the worm 10 and amplify the torque transmitted by the worm 10.

[0034] Furthermore, as shown in FIG2 , an adjustment sleeve 30 can be mounted externally of the worm 10. In some embodiments, an opening 33 is provided in the middle of the adjustment sleeve 30 to allow the worm 10 within the adjustment sleeve 30 to contact and engage with the worm wheel 20. Furthermore, along the first central axis O1 of the worm 10, a front bearing 11 and a rear bearing 12 are provided at the front end (the right end as shown in FIG22 ) and rear end (the left end as shown in FIG2 ), respectively. The inner rings of the front bearing 11 and the rear bearing 12 are respectively mounted in a torsionally fixed manner on the front and rear ends of the worm 10. The outer rings of the front bearing 11 and the rear bearing 12 are respectively torsionally connected to the inner wall of the adjustment sleeve 30. The front bearing 11 and the rear bearing 12 are used to secure the worm 10 within the adjustment sleeve 30 and allow the worm 10 to rotate relative to the adjustment sleeve 30 about the first central axis O1.

[0035] Furthermore, when the adjustment sleeve 30 is pre-installed in the reducer housing 40 and is not fixed to the reducer housing 40, the outer wall of the adjustment sleeve 30 can match the inner wall of the reducer housing 40, and the outer wall of the adjustment sleeve 30 and the inner wall of the reducer housing 40 can be matched through a clearance, so that the adjustment sleeve 30 can rotate around the third center axis O3 relative to the reducer housing 40 in the reducer housing 40. In other embodiments, the outer wall of the adjustment sleeve 30 can also rotate around the third center axis O3 with the inner wall of the reducer housing 40 through a bearing, which is not specifically limited here.

[0036] As shown in Figure 3, the adjustment sleeve 30 is eccentrically positioned relative to the worm 10. Preferably, the third center axis O3 of the adjustment sleeve 30 is parallel to and offset from the first center axis O1 of the worm 10. Specifically, in this embodiment, the adjustment sleeve 30 has a circular cross-section and is internally provided with a worm hole, also of a circular cross-section. The worm 10, along with the front and rear bearings 11 and 12, are positioned within the worm hole. The center of the adjustment sleeve 30 does not coincide with the center of the worm hole (i.e., the first center axis O1 of the worm 10). In this manner, the front and rear bearings 11 and 12 of the worm 10 maintain a parallel and constant offset between the first center axis O1 of the worm 10 and the third center axis O3 of the adjustment sleeve 30, thereby preventing the worm 10 from tilting within the worm hole.

[0037] It can be seen that when the adjustment sleeve 30 rotates around the third center axis O3, it can drive the worm 10 located in the adjustment sleeve 30 to move together, and make the first center axis O1 of the worm 10 move in a circle around the third center axis O3 as the axis, thereby changing the position of the first center axis O1 of the worm 10.

[0038] Since the distance between the third center axis O3 and the second center axis O2 (hereinafter referred to as the first center distance D1) remains unchanged, as the position of the first center axis O1 of the worm 10 changes, the center distance between the first center axis O1 of the worm 10 and the second center axis O2 of the worm wheel 20 (hereinafter referred to as the second center distance D2) changes (i.e., becomes larger or smaller), thereby realizing the adjustment of the tooth clearance between the worm 10 and the worm wheel 20.

[0039] In summary, by providing an adjustment sleeve 30 that is eccentric to the worm 10, that is, the third center axis O3 of the adjustment sleeve 30 is parallel to and offset from the first center axis O1 of the worm 10, and the first center distance D1 between the third center axis O3 of the adjustment sleeve 30 and the second center axis O2 of the worm wheel 20 remains unchanged, the first center axis O1 of the worm 10 can rotate as the adjustment sleeve 30 rotates about the third center axis O3, thereby changing the second center distance D2 between the worm 10 and the worm wheel 20.

[0040] The tooth clearance adjustment method of the worm 10 and the worm wheel 20 disclosed in the present invention is simple, and the tooth clearance between the worm 10 and the worm wheel 20 can be adjusted quickly and accurately. In addition, compared with the traditional tooth clearance adjustment device, the present invention omits the adjustment spring, adjustment bolt, and special self-aligning bearing and other structures, so that the worm gear tooth clearance adjustment device 100 disclosed in the present invention has fewer parts, a simple structure, and a low assembly process difficulty, and the overall cost is low.

[0041] It should be noted that the circumferential dimension of the opening 33 in the adjustment sleeve 30 ensures that the worm 10 and the worm wheel 20 remain in constant engagement when the adjustment sleeve 30 rotates a predetermined amount. Furthermore, the offset distance between the third central axis O3 and the first central axis O1 can be determined based on different backlash adjustment requirements and is not specifically limited herein.

[0042] In some embodiments, as shown in Figures 1, 2, and 4, a flange 31 is provided at the end of the adjustment sleeve 30. The flange 31 is located at the end of the adjustment sleeve 30 near the rear end (the left end as shown in Figure 2) of the worm 10. The flange 31 and / or the reducer housing 40 are provided with a first waist-shaped hole 32 extending in the circumferential direction. That is, the first waist-shaped hole 32 can be located on the flange 31, and the reducer housing 40 can be provided with multiple threaded holes at positions corresponding to the flange 31 (as in this embodiment), or the flange 31 can be provided with threaded holes, and the first waist-shaped hole 32 can also be provided at a position on the reducer housing 40 corresponding to the flange 31.

[0043] In this embodiment, as shown in Figures 1 and 5, when the adjusting sleeve 30 is pre-installed in the reducer housing 40, when the adjusting sleeve 30 is rotated to meet the tooth clearance requirement of the worm wheel 20 and the worm 10, the first fastener 71 is inserted into the threaded hole of the reducer housing 40 through the first waist-shaped hole 32 and tightened to achieve the fixation of the adjusting sleeve 30 and the reducer housing 40. At this time, the distance between the second center distance of the worm 10 and the worm wheel 20 is determined, and the position of the worm 10 no longer changes.

[0044] The circumferential length of the first waist-shaped hole 32 (or the size of the central angle θ1 of the first waist-shaped hole 32) can, on the one hand, limit the rotation of the adjustment sleeve 30, thereby preventing the adjustment sleeve 30 from rotating too much, which could result in the second center distance D2 between the worm 10 and the worm wheel 20 being too far or too close, resulting in an inability to transmit torque or severe gear wear. Furthermore, it can save time in adjusting the rotation of the adjustment sleeve 30. On the other hand, the adjustment sleeve 30 rotates about the third center axis O3, driving the first waist-shaped hole 32 on the flange 31 to also rotate about the third center axis O3. The circumferential length of the first waist-shaped hole 32, within the preset rotation amount of the adjustment sleeve 30, can always cover the threaded hole of the reducer housing 40 along the circumferential direction, allowing the first fastener 71 to pass through the first waist-shaped hole 32 and tighten with the threaded hole on the reducer housing 40, thereby securing the adjustment sleeve 30 to the reducer housing 40.

[0045] In some embodiments, two first waist-shaped holes 32 may be provided on the circumference of the flange 31, and the two first waist-shaped holes 32 may be centrally symmetrically arranged, so that when the adjustment sleeve 30 is fixed to the reducer housing 40 via the flange 31, the force in the circumferential direction can be more uniform.

[0046] In some embodiments, the worm gear tooth clearance adjustment device 100 also includes a motor housing 50 and a motor output shaft 60. The motor output shaft 60 is located in the motor housing 50 and is fixed in position. The motor output shaft 60 can rotate relative to the motor housing 50 around the fourth center axis O4. The motor output shaft 60 is used to transmit the motor torque to the worm 10 through the coupling.

[0047] Furthermore, the worm gear tooth clearance adjustment device 100 further includes a plum blossom coupling 80 flexibly and rigidly connected between the worm 10 and the motor output shaft 60 .

[0048] The plum blossom coupling 80 includes two rigid metal sleeves 81 and a plum blossom rubber pad 82. The plum blossom rubber pad 82 is located between the two metal sleeves 81. The plum blossom coupling 80 has both a certain degree of deformation ability and a certain degree of rigidity. Specifically, the two metal sleeves 81 are respectively provided with anti-torsion sleeves at the ends of the worm 10 and the ends of the motor output shaft 60. The plum blossom rubber pad 82 is located between the end faces of the worm 10 and the end faces of the motor output shaft 60. The plum blossom rubber pad 82 provides a flexible connection between the worm 10 and the motor output shaft 60. When the worm 10 is subjected to external impact force, it can isolate the impact force and protect the motor. The plum blossom rubber pad 82 is usually made of rubber or polyurethane. The metal sleeves 81 give the plum blossom coupling 80 a certain degree of rigidity, ensuring the stable transmission and output of the motor torque.

[0049] Furthermore, a connecting plate 41 is provided at the end of the reducer housing 40, and a second waist-shaped hole 42 extending circumferentially is provided on the connecting plate 41. A threaded hole 51 is provided at one end of the motor housing 50 close to the connecting plate 41 of the reducer housing 40. The position of the threaded hole 51 on the motor housing 50 is fixed, that is, the position of the threaded hole 51 relative to the motor output shaft 60 is fixed.

[0050] After rotating the adjusting sleeve 30 so that the tooth clearance between the worm 10 and the worm wheel 20 meets the requirements, the adjusting sleeve 30 is fixed to the reducer housing 40, so that the position of the worm 10 is also fixed, and the motor output shaft 60 is connected to the worm 10 through the plum blossom coupling 80, and the fourth center axis O4 of the motor output shaft 60 is coaxial with the first center axis O1 of the worm 10, the second waist-shaped hole 42 is used to align the threaded hole 51, and the second fastener 72 passes through the second waist-shaped hole 42 and is inserted into the threaded hole 51 and tightened, so that the reducer housing 40 and the motor housing 50 are fixed.

[0051] From the above content, it can be seen that the first center axis O1 of the worm 10 can perform circular motion around the third center axis O3 as the axis center. Since the motor output shaft 60 needs to be coaxial with the worm 10, when the worm 10 moves according to the above motion trajectory, the motor output shaft 60 also moves along the motion trajectory of the first center axis O1 with the worm 10. Moreover, since the positions of the motor output shaft 60, the motor housing 50, and the threaded hole 51 remain unchanged, it is equivalent to that the entire motor is adjusted along the motion trajectory of the first center axis O1 of the worm 10 with the motor output shaft 60. Therefore, under the requirements of different tooth clearances of the worm wheel 20 and the worm 10, the position of the motor housing 50 is also different.

[0052] As shown in Figure 6, a second waist-shaped hole 42 is set on the connecting plate 41 of the reducer housing 40. The central angle θ2 of the second waist-shaped hole 42 can be greater than or equal to the central angle θ1 of the first waist-shaped hole 32. In this way, when the motor housing 50 is in different positions, the bolt holes on the motor housing 50 always fall into the second waist-shaped hole 42 along the circumferential direction, and the motor housing 50 can be installed in multiple positions under various worm wheel 20 and worm 10 tooth clearance requirements.

[0053] In some embodiments, two second waist-shaped holes 42 are provided on the circumference of the connecting plate 41 of the reducer housing 40. The two second waist-shaped holes 42 can make the connecting plate 41 of the reducer housing 40 and the motor housing 50 more evenly stressed when they are fixedly connected.

[0054] Based on the same inventive concept, the present disclosure provides a steering transmission mechanism for use in a vehicle steering transmission system, including the worm gear backlash adjustment device 100 described above. The specific manner in which the functions implemented in the steering transmission mechanism in the above-described embodiment have been described in detail in the embodiments of the worm gear backlash adjustment device, and will not be further elaborated here.

[0055] It is understood that in this disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. The singular forms "a", "the", and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0056] It will be further understood that the terms "first," "second," and the like are used to describe various structures, but these structures should not be limited to these terms. These terms are merely used to distinguish structures of the same type from one another and do not indicate a particular order or degree of importance. In fact, the expressions "first," "second," and the like are fully interchangeable. For example, a first structure could also be referred to as a second structure, and similarly, a second structure could also be referred to as a first structure without departing from the scope of this disclosure.

[0057] It can be further understood that the terms "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0058] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0059] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A worm gear tooth clearance adjustment device (100), characterized in that: include: A worm (10) rotatable about a first central axis (O1); a worm wheel (20) rotatable about a second central axis (O2) and meshing with the worm (10); and an adjusting sleeve (30) which is sleeved on the outside of the worm (10) and allows the worm (10) to rotate around the first central axis (O1) within the adjusting sleeve (30); The adjusting sleeve (30) and the worm (10) are eccentrically arranged, and the position of the first center axis (O1) of the worm (10) is changed by rotating the adjusting sleeve (30) to adjust the center distance between the first center axis (O1) and the second center axis (O2) of the worm wheel (20), thereby realizing the tooth clearance adjustment between the worm (10) and the worm wheel (20).

2. The worm gear tooth clearance adjustment device (100) according to claim 1, characterized in that: The end of the adjustment sleeve (30) is provided with a flange (31), and the flange (31) is provided with a first waist-shaped hole (32) extending in the circumferential direction. The worm gear tooth clearance adjustment device (100) further comprises a reducer housing (40), and the adjustment sleeve (30) is located in the reducer housing (40); Wherein, within a preset rotation range, the adjustment sleeve (30) can always be fixedly connected to the reducer housing (40) via the first waist-shaped hole (32).

3. The worm gear tooth clearance adjustment device (100) according to claim 2, characterized in that: The worm gear tooth clearance adjustment device (100) further comprises: A motor housing (50), wherein a threaded hole (51) is provided at an end of the motor housing (50); The motor output shaft (60) is located in the motor housing (50) and is used for transmission connection with the worm (10). By adjusting the motor output shaft (60) to be coaxially aligned with the worm (10), the position of the motor housing (50) is changed. The end of the reducer housing (40) is also provided with a connecting plate (41), and the connecting plate (41) is provided with a second waist-shaped hole (42) extending in the circumferential direction, and after the position of the motor housing (50) is changed, the second waist-shaped hole (42) always covers the threaded hole (51) in the circumferential direction.

4. The worm gear tooth clearance adjustment device (100) according to claim 2, characterized in that: The outer wall of the adjustment sleeve (30) matches the inner wall of the reducer housing (40); before the adjustment sleeve (30) is fixed to the reducer housing (40), the adjustment sleeve (30) can rotate around a third central axis (O3) in the reducer housing (40).

5. The worm gear tooth clearance adjustment device (100) according to claim 4, characterized in that: The worm (10) comprises a front bearing (11) and a rear bearing (12), which are respectively sleeved on two ends of the worm (10) and are used to enable the worm (10) to rotate around the first central axis (O1) in the adjustment sleeve (30) and to make the first central axis (O1) parallel to a third central axis (O3).

6. The worm gear tooth clearance adjustment device (100) according to claim 1, characterized in that: An opening (33) is provided in the middle of the adjustment sleeve (30) for enabling the worm (10) located in the adjustment sleeve 30 to contact and mesh with the worm wheel (20).

7. The worm gear tooth clearance adjustment device (100) according to claim 3, characterized in that: The worm gear tooth clearance adjustment device (100) further comprises a plum blossom coupling (80) which is flexibly and rigidly connected between the worm (10) and the motor output shaft (60).

8. The worm gear tooth clearance adjustment device (100) according to claim 2, characterized in that: Two first waist-shaped holes (32) are arranged on the circumference of the flange (31).

9. The worm gear tooth clearance adjustment device (100) according to claim 3, characterized in that: The connecting plate (41) of the reducer housing (40) is provided with two second Waist-shaped hole (42).

10. A steering transmission mechanism, applied to a steering transmission system of a vehicle, characterized in that: include: A worm gear tooth clearance adjustment device (100) as claimed in any one of claims 1 to 9.

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