Worm and gear tooth gap adjusting device and steering transmission mechanism

Abstract

A worm gear tooth gap adjusting device and a steering transmission mechanism. The worm gear tooth gap adjusting device (100) comprises a worm (10) rotatable around a first central axis (O1), a worm gear (20) rotatable around a second central axis (O2) and meshing with the worm (10), and an adjusting sleeve (30) sleeved outside the worm (10) and allowing the worm (10) to rotate around the first central axis (O1) in the adjusting sleeve (30), the adjusting sleeve (30) being eccentrically arranged with the worm (10). The worm changes position with the rotation of the adjusting sleeve to change the center distance of the worm and the worm gear, so as to realize the rapid adjustment of the tooth gap of the worm and the worm gear.

Description

Technical Field

[0001] This utility model relates to the field of vehicle power steering technology, and in particular to a worm gear backlash adjustment device and steering transmission mechanism for a vehicle steering system. Background Technology

[0002] Currently, commercial vehicles generally use electro-hydraulic power steering (EHPS) systems, which combine electric and hydraulic power steering for steering. The main transmission mechanism in EHPS is a worm gear drive. In this mechanism, the backlash between the worm wheel and worm significantly affects transmission efficiency and noise.

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

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

[0005] When the center distance is too large and the tooth clearance is too large, the worm gear meshing will be too loose. There will be backlash on the tooth surface of the worm gear. When the worm reverses direction, the worm needs to travel a certain angle before it can clear the backlash and then make instantaneous contact with the worm gear. The resulting impact will cause noise and will also affect the life of the tooth surface.

[0006] In related technologies, backlash adjustment mechanisms typically involve adjusting the position of the worm tail bearing. Adjusting the position of the worm front bearing causes the worm's central axis to shift, creating an angle between the motor output shaft centerline and the worm's central axis. This results in fluctuations in the torque and speed transmitted from the motor to the worm, which in turn affects the torque and speed output of the worm wheel. Ultimately, this impacts the driver's steering feel and stability. Utility Model Content

[0007] To overcome the problems existing in related technologies, this disclosure provides a worm gear tooth backlash adjustment device and a steering transmission mechanism.

[0008] According to a first aspect of the present disclosure, a worm gear backlash adjustment device is provided, comprising: a worm gear rotatable about a first central axis; a worm gear rotatable about a second central axis and meshing with the worm gear; and an adjusting sleeve sleeved on the outside of the worm gear, allowing the worm gear to rotate about the first central axis within the adjusting sleeve, wherein the adjusting sleeve is eccentrically disposed with respect to the worm gear, and by rotating the adjusting sleeve, the position of the first central axis of the worm gear is changed to adjust the center distance between the first central axis and the second central axis of the worm gear, thereby realizing the backlash adjustment between the worm gear and the worm gear.

[0009] In some embodiments, the end of the adjusting sleeve is provided with a flange, the flange is provided with a first oblong hole extending circumferentially, the worm gear backlash adjustment device further includes a reducer housing, and the adjusting sleeve is located inside the reducer housing; wherein, within a preset rotation range, the adjusting sleeve can always be fixedly connected to the reducer housing through the first oblong hole.

[0010] In some embodiments, the worm gear backlash adjustment device further includes: a motor housing, the end of which is provided with a threaded hole; a motor output shaft, located inside the motor housing, for connection with the worm gear transmission, wherein the position of the motor housing is changed by adjusting the coaxial alignment of the motor output shaft with the worm gear, wherein the end of the reducer housing is provided with a connecting plate, the connecting plate being provided with a second oblong hole extending circumferentially, the second oblong hole always covering the threaded hole circumferentially after the position of the motor housing is changed.

[0011] In some embodiments, the outer wall of the adjusting sleeve matches the inner wall of the housing, and before the adjusting sleeve is fixed to the housing, the adjusting sleeve can rotate about the third central axis in the housing.

[0012] In some embodiments, the worm gear includes a front bearing and a rear bearing, which are respectively sleeved at both ends of the worm gear, for rotating the worm gear around the first central axis within the adjusting sleeve and making the first central axis parallel to the third central axis.

[0013] In some embodiments, the adjusting sleeve has an opening in the middle for the worm inside the adjusting sleeve to contact and engage with the worm wheel.

[0014] In some embodiments, the worm gear backlash adjustment device further includes a perforated coupling, which is flexibly and rigidly connected between the worm and the motor output shaft.

[0015] In some embodiments, the flange is provided with two of the first waist-shaped holes in its circumferential direction.

[0016] In some embodiments, the connecting plate of the reducer housing is provided with two second oblong holes in the circumferential direction.

[0017] According to a second aspect of the present disclosure, a steering transmission mechanism is provided for use in the steering transmission system of a vehicle, including: a worm gear backlash adjustment device as described in the first aspect.

[0018] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: the third central axis of the adjusting sleeve is parallel to and offset from the first central axis of the worm, and the distance between the third central axis of the adjusting sleeve and the second central axis of the worm wheel remains unchanged. The first central axis of the worm changes position as the adjusting sleeve rotates around the third central axis, thereby changing the center distance between the worm and the worm wheel. Compared with traditional tooth backlash adjustment devices, the adjusting spring, adjusting bolt, and specially made self-aligning bearing are omitted, making the structure of the worm wheel and worm tooth backlash adjustment device of this disclosure simpler and easier to install and disassemble, and with lower cost. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0020] Figure 1 This is a cross-sectional view of a worm gear backlash adjustment device according to an exemplary embodiment;

[0021] Figure 2 This is a schematic diagram of the combined structure of the worm gear and the adjusting sleeve according to an exemplary embodiment;

[0022] Figure 3 This is a cross-sectional view of the worm, worm wheel, and adjusting sleeve according to an exemplary embodiment;

[0023] Figure 4 This is a schematic diagram of the structure of the adjusting sleeve flange plate according to an exemplary embodiment;

[0024] Figure 5 This is a schematic diagram showing the positional relationship between the adjusting sleeve, the worm gear, and the reducer housing according to an exemplary embodiment;

[0025] Figure 6 This is a schematic diagram of the structure of the second oblong hole in the reducer housing according to an exemplary embodiment. Detailed Implementation

[0026] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0027] In this invention, the front end of the worm gear refers to the end furthest from the motor, such as... Figure 1 , Figure 2 and Figure 3 On the left side, the rear end of the worm gear refers to the end closest to the motor, such as... Figure 1 , Figure 2 and Figure 3 On the right side of the image. Additionally, "transmission connection" refers to the ability to transmit driving force / torque between two components. These two components can be directly connected or achieve this function through various transmission mechanisms or connection structures. "Torsion-resistant connection" refers to the ability to transmit torque between two components, and the methods for achieving this torque-resistant connection can include interference fits and bolted connections, etc.

[0028] Among related technologies, there are many solutions for adjusting the backlash of worm gears in vehicle steering systems. These vehicles include passenger cars and commercial vehicles. However, the operating conditions of worm gears used in passenger cars and commercial vehicles are different.

[0029] Commercial vehicles mainly rely on hydraulic power steering, which requires very little force from the worm gear in the electric power steering system. As a result, the wear is negligible, so the self-adjusting structure used in passenger cars is not required. Instead, the meshing state can be adjusted during product assembly.

[0030] Steering in passenger vehicles primarily relies on the amplified torque generated by a motor driving a worm gear. The meshing force between the worm gear and worm is relatively large, leading to rapid wear and necessitating a self-adjusting function. This is achieved by adjusting the position of the front bearing through a spring. After the worm gear has been in operation for a period of time, wear occurs, at which point the spring releases its elasticity, pressing the front bearing on the worm and causing the worm to move closer to the worm gear, eliminating the clearance caused by wear and ensuring that the worm gear and worm are always in a good meshing state. However, this method of using adjusting springs in passenger vehicles involves many parts, has a complex structure, and is difficult to assemble and install.

[0031] To solve the above-mentioned technical problems, this disclosure provides a worm gear tooth backlash adjustment device 100, such as... Figure 1 As shown, the worm gear backlash adjustment device 100 includes at least a reducer housing 40 and a worm 10, a worm wheel 20, and an adjusting sleeve 30 located within the reducer housing 40.

[0032] The worm 10 can rotate around the first central axis O1, and the worm wheel 20 can rotate around the second central axis O2, which is perpendicular to the first central axis O1. Therefore, the meshing of the worm wheel 20 and the worm 10 can reverse the torque transmitted from the worm 10 and amplify the torque transmitted from the worm 10.

[0033] Furthermore, such as Figure 2 As shown, the adjusting sleeve 30 can be fitted onto the outside of the worm 10. In some embodiments, the adjusting sleeve 30 has an opening 33 in the middle for the worm 10 inside the adjusting sleeve 30 to contact and mesh with the worm wheel 20. Further, along the first central axis O1 of the worm 10, the front end of the worm 10 (e.g., Figure 2 (as shown on the right end) and the rear end (as shown on the left end) and the rear end (as shown on the right end) Figure 2 The left end (as shown) is provided with a front bearing 11 and a rear bearing 12. The inner rings of the front bearing 11 and the rear bearing 12 are respectively anti-torsively fitted onto the front and rear ends of the worm 10. The outer rings of the front bearing 11 and the rear bearing 12 are respectively anti-torsively connected to the inner wall of the adjusting sleeve 30. The front bearing 11 and the rear bearing 12 are used to fix the worm 10 in the adjusting sleeve 30 and allow the worm 10 to rotate relative to the adjusting sleeve 30 about the first central axis O1 within the adjusting sleeve 30.

[0034] Furthermore, when the adjusting sleeve 30 is pre-installed inside the reducer housing 40 and is not fixed to the reducer housing 40, the outer wall of the adjusting sleeve 30 can match the inner wall of the reducer housing 40, and the outer wall of the adjusting sleeve 30 and the inner wall of the reducer housing 40 can be fitted with a clearance, so that the adjusting sleeve 30 can rotate relative to the reducer housing 40 around the third central axis O3 within the reducer housing 40. In some other embodiments, the outer wall of the adjusting sleeve 30 can also rotate around the third central axis O3 with the inner wall of the reducer housing 40 through a bearing, which is not specifically limited here.

[0035] like Figure 3 As shown, the adjusting sleeve 30 is eccentrically positioned with respect to the worm 10. Preferably, the third central axis O3 of the adjusting sleeve 30 is parallel to and offset from the first central axis O1 of the worm 10. Specifically, in this embodiment, the adjusting sleeve 30 has a circular cross-section, and a worm hole with a similarly circular cross-section is provided inside the adjusting sleeve 30. The worm 10, the front bearing 11, and the rear bearing 12 are located within the worm hole. The center of the adjusting sleeve 30 does not coincide with the center of the worm hole (i.e., the first central axis O1 of the worm 10). In this case, the front bearing 11 and the rear bearing 12 of the worm 10 can be used to keep the first central axis O1 of the worm 10 parallel to the third central axis O3 of the adjusting sleeve 30 with a constant offset distance, so as to prevent the worm 10 from tilting within the worm hole.

[0036] It can be seen that when the adjusting sleeve 30 rotates around the third central axis O3, it can drive the worm 10 located inside the adjusting sleeve 30 to move together, and cause the first central axis O1 of the worm 10 to move around a circle with the third central axis O3 as the axis, thereby changing the position of the first central axis O1 of the worm 10.

[0037] Since the distance between the third central axis O3 and the second central axis O2 (hereinafter referred to as the first center distance D1) remains unchanged, as the position of the first central axis O1 of the worm 10 changes, the center distance between the first central axis O1 of the worm 10 and the second central axis O2 of the worm wheel 20 (hereinafter referred to as the second center distance D2) changes (i.e. increases or decreases), thereby realizing the tooth backlash adjustment between the worm 10 and the worm wheel 20.

[0038] In summary, by setting an adjusting sleeve 30 that is eccentric to the worm 10, that is, the third central axis O3 of the adjusting sleeve 30 is parallel to and offset from the first central axis O1 of the worm 10, and the first center distance D1 between the third central axis O3 of the adjusting sleeve 30 and the second central axis O2 of the worm wheel 20 remains unchanged, the first central axis O1 of the worm 10 can rotate with the adjustment sleeve 30 around the third central axis O3, thereby changing the second center distance D2 between the worm 10 and the worm wheel 20.

[0039] The tooth backlash adjustment method of the worm gear 10 and worm wheel 20 disclosed herein is simple and can quickly and accurately adjust the tooth backlash between the worm gear 10 and worm wheel 20. In addition, compared with traditional tooth backlash adjustment devices, this disclosure omits structures such as adjusting springs, adjusting bolts and specially made self-aligning bearings, making the worm gear tooth backlash adjustment device 100 of this disclosure have fewer parts, simpler structure and lower assembly process difficulty, and lower overall cost.

[0040] It should be noted that the opening 33 on the adjusting sleeve 30, along its circumferential dimension, allows the adjusting sleeve 30 to rotate by a preset amount, ensuring that the worm 10 and worm wheel 20 are always engaged. Furthermore, the offset distance between the third central axis O3 and the first central axis O1 can be determined according to different backlash adjustment requirements, and is not specifically limited here.

[0041] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the end of the adjusting sleeve 30 is provided with a flange 31, which is located near the rear end of the worm gear 10 (e.g., Figure 2One end of the reducer housing (shown as the left end). The flange 31 and / or the reducer housing 40 are provided with a first waist-shaped hole 32 extending circumferentially, that is, the first waist-shaped hole 32 can be located on the flange 31. The reducer housing 40 is provided with multiple threaded holes at the position corresponding to the flange 31 (as in this embodiment), or the flange 31 is provided with threaded holes, and the first waist-shaped hole 32 can also be provided at the position corresponding to the flange 31 on the reducer housing 40.

[0042] In this embodiment, as Figure 1 and Figure 5 As shown, when the adjusting sleeve 30 is pre-installed into the reducer housing 40, after rotating the adjusting sleeve 30 to meet the tooth clearance requirements of the worm gear 20 and the worm 10, the first fastener 71 passes through the first waist-shaped hole 32 and is inserted into the threaded hole of the reducer housing 40 to tighten it, thereby fixing the adjusting sleeve 30 to the reducer housing 40. At this time, the distance between the second center distance of the worm 10 and the worm gear 20 is determined, and the position of the worm 10 no longer changes.

[0043] The circumferential length of the first oblong hole 32 (or the size of the central angle θ1 of the first oblong hole 32) can, on the one hand, limit the rotation of the adjusting sleeve 30, preventing excessive rotation of the adjusting sleeve 30 from causing the second center distance D2 between the worm gear 10 and the worm wheel 20 to be too far or too close, resulting in the inability to transmit torque or severe gear wear. It can also save time in adjusting the rotation of the adjusting sleeve 30. On the other hand, the rotation of the adjusting sleeve 30 around the third central axis O3 causes the first oblong hole 32 on the flange 31 to also rotate around the third central axis O3. Within the preset rotation of the adjusting sleeve 30, the circumferential length of the first oblong hole 32 can always cover the threaded hole of the reducer housing 40, so that the first fastener 71 can pass through the first oblong hole 32 and tighten with the threaded hole on the reducer housing 40, thereby fixing the adjusting sleeve 30 to the reducer housing 40.

[0044] In some embodiments, the flange 31 may be provided with two first oblong holes 32 in the circumferential direction, and the two first oblong holes 32 may be centrally symmetrically arranged. This allows the adjusting sleeve 30 to be fixed to the reducer housing 40 via the flange 31 to receive more uniform force in the circumferential direction.

[0045] In some embodiments, the worm gear backlash adjustment device 100 further includes a motor housing 50 and a motor output shaft 60. The motor output shaft 60 is located inside the motor housing 50 and is fixed in position. The motor output shaft 60 can rotate relative to the motor housing 50 about the fourth central axis O4. The motor output shaft 60 is used to transmit the motor torque to the worm 10 through a coupling.

[0046] Furthermore, the worm gear backlash adjustment device 100 also includes a perforated coupling 80, which is flexibly and rigidly connected between the worm 10 and the motor output shaft 60.

[0047] The plum blossom coupling 80 includes two rigid metal bushings 81 and a plum blossom rubber pad 82, with the rubber pad 82 positioned between the two metal bushings 81. The plum blossom coupling 80 possesses both a certain degree of deformation capacity and rigidity. Specifically, the two metal bushings 81 are respectively anti-torsional sleeved at the ends of the worm gear 10 and the motor output shaft 60. The plum blossom rubber pad 82 is located between the end faces of the worm gear 10 and the motor output shaft 60, providing a flexible connection between the worm gear 10 and the motor output shaft 60. When the worm gear 10 is subjected to external impact, it can isolate the impact force, protecting the motor. The plum blossom rubber pad 82 is typically made of rubber or polyurethane. The metal bushings 81 provide the plum blossom coupling 80 with a certain degree of rigidity, ensuring stable transmission and output of motor torque.

[0048] 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 near 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.

[0049] After rotating the adjusting sleeve 30 to ensure 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, thus fixing the position of the worm 10. The motor output shaft 60 is connected to the worm 10 via the plum blossom coupling 80, and the fourth central axis O4 of the motor output shaft 60 is coaxial with the first central axis O1 of the worm 10. The second oblong hole 42 is used to align the threaded hole 51. The second fastener 72 passes through the second oblong hole 42 and is inserted into the threaded hole 51 and tightened, thus fixing the reducer housing 40 and the motor housing 50.

[0050] As can be seen from the above, the first central axis O1 of the worm 10 can rotate around the third central axis O3. Since the motor output shaft 60 needs to be coaxial with the worm 10, when the worm 10 moves along the above motion trajectory, the motor output shaft 60 also moves along the motion trajectory of the first central axis O1. Since the positions of the motor output shaft 60, the motor housing 50, and the threaded hole 51 remain unchanged, it is equivalent to the entire motor adjusting along the motion trajectory of the motor output shaft 60 along the first central axis O1 of the worm 10. Therefore, the position of the motor housing 50 is also different under different requirements of the tooth clearance of the worm gear 20 and the worm 10.

[0051] like Figure 6As shown, a second oblong hole 42 is provided on the connecting plate 41 of the reducer housing 40. The central angle θ2 of the second oblong hole 42 can be greater than or equal to the central angle θ1 of the first oblong hole 32. This ensures that the bolt holes on the motor housing 50 always fall into the second oblong hole 42 in the circumferential direction when the motor housing 50 is in different positions, thus satisfying the installation of the motor housing 50 in various positions under various worm gear 20 and worm 10 tooth clearance requirements.

[0052] In some embodiments, the connecting plate 41 of the reducer housing 40 is provided with two second oblong holes 42 in the circumferential direction. The two second oblong holes 42 can make the force more even when the connecting plate 41 of the reducer housing 40 is fixedly connected to the motor housing 50.

[0053] Based on the same inventive concept, this disclosure provides a steering transmission mechanism applied to the steering transmission system of a vehicle, including the worm gear backlash adjustment device 100 as described above. The specific manner in which the function of the steering transmission mechanism in the above embodiments is implemented has been described in detail in the embodiments relating to the worm gear backlash adjustment device, and will not be elaborated further here.

[0054] It is understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects 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.

[0055] It is further understood that the terms "first," "second," etc., are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish structures of the same type from one another and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, a first structure can also be called a second structure, and similarly, a second structure can also be called a first structure.

[0056] It is further understood that the terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation.

[0057] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following scope of claims.

[0058] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A worm gear tooth backlash adjustment device (100), characterized in that, include: The worm (10) can rotate about the first central axis (O1); A worm gear (20) is rotatable about a second central axis (O2) and meshes with the worm (10); and An adjusting sleeve (30) is fitted over 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) is eccentrically positioned with the worm (10). By rotating the adjusting sleeve (30), the position of the first central axis (O1) of the worm (10) is changed, thereby adjusting the center distance between the first central axis (O1) and the second central axis (O2) of the worm wheel (20), and thus realizing the tooth gap adjustment between the worm (10) and the worm wheel (20).

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

3. The worm gear tooth clearance adjusting device (100) according to claim 2, characterized in that, The worm gear backlash adjustment device (100) further includes: Motor housing (50), the end of which is provided with threaded hole (51); The motor output shaft (60) is located inside the motor housing (50) and is used for transmission connection with the worm gear (10). By adjusting the coaxial alignment of the motor output shaft (60) and the worm gear (10), the position of the motor housing (50) can be 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. After the position of the motor housing (50) changes, the second waist-shaped hole (42) always covers the threaded hole (51) in the circumferential direction.

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

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

6. The worm gear tooth clearance adjusting device (100) according to claim 1, characterized in that, The adjusting sleeve (30) has an opening (33) in the middle, which is used to allow the worm (10) located in the adjusting sleeve (30) to contact and mesh with the worm wheel (20).

7. The worm gear tooth clearance adjusting device (100) according to claim 3, characterized in that, The worm gear backlash adjustment device (100) also includes 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 adjusting device (100) according to claim 2, characterized in that, The flange (31) has two first waist-shaped holes (32) arranged in the circumferential direction.

9. The worm gear tooth clearance adjusting device (100) according to claim 3, characterized in that, The connecting plate (41) of the reducer housing (40) has two second waist-shaped holes (42) in the circumferential direction.

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

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