Adjustment device for intertooth grooves between worm gear and worm, and steering transmission mechanism

Abstract

An adjustment device for the intertooth groove between a worm gear and a worm, and a steering transmission mechanism. The adjustment device (100) for the intertooth groove between a worm gear and a worm comprises a worm (10) that can rotate around a first central axis (O1), a worm gear (20) that can rotate around a second central axis (O2) and engages with the worm (10), and an adjustment sleeve (30) which has a sleeve attached to the outside of the worm (10) and is positioned eccentrically with respect to the worm (10), allowing the worm (10) to rotate around the first central axis (O1) inside. The position of the worm changes with the rotation of the adjustment sleeve so that the central distance between the worm and the worm gear changes, thereby achieving rapid adjustment of the intertooth groove between the worm and the worm gear.

Description

Technical Field

[0006]

[0001] The present invention relates to the technical field of power assist steering for vehicles, and particularly relates to an adjusting device for the tooth gap between a worm gear and a worm for a steering system of a vehicle, and a steering transmission mechanism.

Background Art

[0002] At present, the steering systems of commercial vehicles generally introduce electro-hydraulic power steering (hereinafter referred to as EHPS) products, and their steering functions are achieved by a combination of electric assist and hydraulic power assist. The main transmission mechanism in EHPS is a worm gear and a worm transmission mechanism. In the worm gear and worm transmission mechanism, the size of the tooth gap between the worm gear and the worm has a significant impact on the transmission efficiency and noise.

[0003] Since the worm gear and the worm transmission mechanism are fixedly installed in the housing, after installation, the following two coordination effects occur in the worm gear and the worm.

[0004] When the center distance is slightly short and the tooth gap is too small, the worm gear and the worm engage in an overly tight manner, and the tooth surfaces of the worm and the worm gear press against each other, thereby increasing the frictional force, reducing the transmission efficiency, and deteriorating the wear of the tooth surfaces of the worm gear and the worm.

[0005] [[ID=​​​​In related technologies, the inter-tooth groove adjustment mechanism generally employs a method of adjusting the bearing position at the end of the worm. Adjusting the bearing position at the end of the worm causes displacement of the worm's central axis, resulting in an angle between the centerline of the motor output shaft and the central axis of the worm. Consequently, the torque and rotational speed transmitted from the motor to the worm fluctuate, thereby affecting the torque and rotational speed of the worm gear, and ultimately impacting the steering feel and stability perceived by the driver. [Overview of the project] [Means for solving the problem]

[0007] To overcome the problems present in related technologies, this disclosure provides an adjustment device for the intertooth groove between a worm gear and a worm, and a steering transmission mechanism.

[0008] According to a first aspect of the embodiments of the present disclosure, an adjustment device for an intertooth groove between a worm gear and a worm is provided, the adjustment device for an intertooth groove between a worm gear and a worm comprising: a worm that can rotate about a first central axis; a worm gear that can rotate about a second central axis and engages with the worm; and an adjustment sleeve, the adjustment sleeve having a sleeve attached to the outside of the worm, allowing the worm to rotate about the first central axis within the adjustment sleeve, the adjustment sleeve being eccentrically positioned with respect to the worm, and by rotating the adjustment sleeve, the position of the first central axis of the worm is changed to adjust the central distance between the first central axis and the second central axis of the worm gear, thereby achieving adjustment of the intertooth groove between the worm and the worm gear.

[0009] In some embodiments, the end of the adjustment sleeve is provided with a flange, the flange is provided with a first elongated hole extending circumferentially, and the adjustment device for the intertooth groove between the worm gear and the worm further comprises a reduction gear housing, the adjustment sleeve is located within the reduction gear housing, and the adjustment sleeve can always be fixedly connected to the reduction gear housing through the first elongated hole within a preset range of rotation.

[0010] In some embodiments, the adjustment device for the intertooth groove between the worm gear and the worm is a motor housing, further comprising a motor housing having a screw hole at one end, and a motor output shaft located within the motor housing and configured to transmit to the worm, wherein the position of the motor housing is changed by adjusting the motor output shaft to align coaxially with the worm, and a connecting plate is provided at the end of the reduction gear housing, the connecting plate having a second elongated hole extending circumferentially thereon, the second elongated hole always covering the screw hole circumferentially after the position of the motor housing has changed.

[0011] In some embodiments, the outer wall of the adjustment sleeve aligns with the inner wall of the housing, and the adjustment sleeve may rotate around a third central axis within the housing prior to being fixed to the housing.

[0012] In some embodiments, the worm includes a front bearing and a rear bearing, the front bearing and the rear bearing each having sleeves attached to both ends of the worm, and are used to allow the worm to rotate around a first central axis within an adjustment sleeve, and to make the first central axis parallel to a third central axis.

[0013] In some embodiments, the middle portion of the adjustment sleeve is provided with an opening used to allow the worm within the adjustment sleeve to contact and engage with the worm gear.

[0014] In some embodiments, the adjustment device for the intertooth groove between the worm gear and the worm further comprises a plumb coupling that is flexibly and securely connected between the worm and the motor output shaft.

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

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

[0017] According to a second aspect of the embodiments of the present disclosure, the present disclosure provides a steering transmission mechanism for a vehicle steering transmission system, comprising an adjustment device for the intertooth groove between a worm gear and a worm as described in the first embodiment.

[0018] The technical solutions provided by embodiments of this disclosure may include 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 distance between the third central axis of the adjustment sleeve and the second central axis of the worm gear is constant. The position of the first central axis of the worm changes with rotation around the third central axis of the adjustment sleeve, so that the central distance between the worm and the worm gear changes. Compared to conventional intertooth groove adjustment devices, structures such as adjustment springs, adjustment bolts, and special self-aligning bearings are omitted, and as a result, the adjustment device for intertooth grooves between the worm gear and the worm of this disclosure is small, simple in structure, convenient and easy to install and disassemble, and low cost.

[0019] The accompanying drawings incorporated herein and constituting part thereof are used to illustrate embodiments in accordance with this disclosure and to illustrate the principles of this disclosure together with this specification. [Brief explanation of the drawing]

[0020] [Figure 1]This is a cross-sectional view of an adjustment device for an intertooth groove between a worm gear and a worm, as shown according to an exemplary embodiment. [Figure 2] This is a schematic diagram of the coupling structure of the worm and adjustment sleeve as shown according to an exemplary embodiment. [Figure 3] This is a cross-sectional view of a worm, worm gear, and adjustment sleeve as shown according to an exemplary embodiment. [Figure 4] This is a schematic diagram of the structure of the flange of the adjustment sleeve, as shown according to an exemplary embodiment. [Figure 5] This is a schematic diagram showing the positional relationship between the adjustment sleeve, worm, and gearbox housing, as illustrated according to an exemplary embodiment. [Figure 6] This is a schematic diagram of the structure of the second elongated hole in the gearbox housing, as shown according to an exemplary embodiment. [Modes for carrying out the invention]

[0021] Exemplary embodiments are illustrated in detail, and these examples are illustrated in the accompanying figures. Where the following description refers to the accompanying figures, unless otherwise indicated, the same numbers in different accompanying figures represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. On the contrary, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure, as described in detail in the accompanying claims.

[0022] In the present invention, the tip of the worm refers to one end away from the motor, as shown on the left side of FIGS. 1, FIGS. 2, and FIGS. 3. The rear end of the worm refers to one end close to the motor, as shown on the right side of FIGS. 1, FIGS. 2, and FIGS. 3. In addition, "transmission connection" refers to the ability of driving force / torque to be transmitted between two components. The two components may be directly connected, and also may be connected through various transmission mechanisms or connection structures for achieving the above functions. "Torsion-resistant connection" refers to the ability of torque to be transmitted between two components, and the methods for achieving torque-resistant connection may include interference fit and bolt joint, etc.

[0023] In the related art, there are many solutions for the adjustment of the tooth flutes between the worm gear and the worm used for a vehicle steering system. Vehicles include passenger vehicles and commercial vehicles. The operating states of the worm gear and the worm used in passenger vehicles are different from those of the worm gear and the worm used in commercial vehicles.

[0024] The steering of commercial vehicles mainly relies on hydraulic power assist. The force required for the worm gear and the worm using electric assist is extremely small, and as a result, the wear amount is negligibly small. Therefore, the automatic adjustment structure of passenger vehicles may not be used. Instead, the engagement state may be adjusted during product assembly.

[0025] The steering of passenger vehicles is primarily achieved by relying on torque amplified by a worm gear and a motor-driven worm. The engagement force between the worm gear and the worm is somewhat large, resulting in rapid wear and requiring an automatic adjustment mechanism. The position of the tip bearing is adjusted by tightening a spring. After the worm gear and worm have been operating for a period of time, wear occurs. At this time, the spring releases its elastic force, firmly pressing the tip bearing against the worm and driving the worm closer to the worm gear, thereby eliminating grooves caused by wear and allowing the worm gear and worm to always remain in a good engaged state. However, such a method of adjusting springs used in passenger vehicles has a complex structure and many parts that are difficult to assemble and install.

[0026] To solve the above technical problems, this disclosure provides an adjustment device 100 for the intertooth groove between a worm gear and a worm. As shown in Figure 1, the adjustment device 100 for the intertooth groove between a worm gear and a worm comprises at least a reduction gear housing 40, and a worm 10, a worm gear 20, and an adjustment sleeve 30 located within the reduction gear housing 40.

[0027] The worm 10 can rotate around a first central axis O1, and the worm gear 20 is antarafacial and can rotate around a second central axis O2 perpendicular to the first central axis O1. Thus, the engagement of the worm gear 20 and the worm 10 can perform orthogonal reversal of the torque transmitted from the worm 10 and amplify the torque transmitted from the worm 10.

[0028] Furthermore, as shown in Figure 2, the adjustment sleeve 30 may be sleeved on the outside of the worm 10. In some embodiments, the middle portion of the adjustment sleeve 30 is provided with an opening 33 used to allow the worm 10 within the adjustment sleeve 30 to contact and engage with the worm gear 20. Furthermore, along the direction of the first central axis O1 of the worm 10, the front end (right end as shown in Figure 22) and rear end (left end as shown in Figure 2) of the worm 10 are provided with a front bearing 11 and a rear bearing 12, respectively, and the inner rings of the front bearing 11 and rear bearing 12 are sleeved in a torsion-resistant manner at the front and rear ends of the worm 10, respectively, and the outer rings of the front bearing 11 and rear bearing 12 are connected in a torsion-resistant manner to the inner wall of the adjustment sleeve 30, respectively. The front bearing 11 and rear bearing 12 are used to secure the worm 10 within the adjustment sleeve 30, allowing the worm 10 to rotate within the adjustment sleeve 30 around the first central axis O1 relative to the adjustment sleeve 30.

[0029] Furthermore, when the adjustment sleeve 30 is pre-installed in the gearbox housing 40 and not fixed to the gearbox housing 40, the outer wall of the adjustment sleeve 30 may align with the inner wall of the gearbox housing 40, and the outer wall of the adjustment sleeve 30 may be clearance-fitted with the inner wall of the gearbox housing 40, and as a result, the adjustment sleeve 30 can rotate within the gearbox housing 40 around a third central axis O3 relative to the gearbox housing 40. In some other embodiments, the rotation of the outer wall of the adjustment sleeve 30 and the inner wall of the gearbox housing 40 around the third central axis O3 can also be achieved through bearings, but this is not particularly limited herein.

[0030] As shown in Figure 3, the adjustment sleeve 30 is positioned eccentrically with respect to the worm 10. Preferably, the third central axis O3 of the adjustment sleeve 30 is parallel to and offset from the first central axis O1 of the worm 10. Specifically, in this embodiment, the cross-section of the adjustment sleeve 30 is circular, and a worm bore, also with a circular cross-section, is provided inside the adjustment sleeve 30. The worm 10, front bearing 11, and rear bearing 12 are located within the worm bore, and the center of the adjustment sleeve 30 does not coincide with the center of the worm bore (i.e., the first central axis O1 of the worm 10). In this case, the front bearing 11 and rear bearing 12 of the worm 10 may be used to keep the first central axis O1 of the worm 10 parallel to the third central axis O3 of the adjustment sleeve 30 without changing the offset distance, in order to prevent the worm 10 from tilting into the worm bore.

[0031] As the adjustment sleeve 30 rotates around the third central axis O3, the worm 10 located within the adjustment sleeve 30 may be driven to move along with it, and the first central axis O1 of the worm 10 may, as an axis, perform circular motion around the third central axis O3, thereby changing the position of the first central axis O1 of the worm 10.

[0032] Since the distance between the third central axis O3 and the second central axis O2 (hereinafter referred to as the first central distance D1) remains constant, when the position of the first central axis O1 of the worm 10 changes, the central distance between the first central axis O1 of the worm 10 and the second central axis O2 of the worm gear 20 (hereinafter referred to as the second central distance D2) changes (i.e., it becomes larger or smaller), thereby achieving adjustment of the intertooth groove between the worm 10 and the worm gear 20.

[0033] In summary, by providing the adjustment sleeve 30 eccentrically with respect to the worm 10, that is, by allowing the third central axis O3 of the adjustment sleeve 30 to be parallel to and offset from the first central axis O1 of the worm 10, and by keeping the first central distance D1 between the third central axis O3 of the adjustment sleeve 30 and the second central axis O2 of the worm gear 20 unchanged, the first central axis O1 of the worm 10 can rotate with the rotation around the third central axis O3 of the adjustment sleeve 30, thereby changing the second central distance D2 between the worm 10 and the worm gear 20.

[0034] This disclosure provides a simple method for adjusting the intertooth groove between the worm 10 and the worm gear 20, enabling fast and precise adjustment of the intertooth groove between the worm 10 and the worm gear 20. Furthermore, compared to conventional intertooth groove adjustment devices, this disclosure omits structures such as adjustment springs, adjustment bolts, and special self-aligning bearings. As a result, the intertooth groove adjustment device 100 for the worm gear and worm of this disclosure has fewer parts, a simpler structure, is easier to assemble, and is generally lower in cost.

[0035] It should be noted that the size of the opening 33 on the adjustment sleeve 30, along the circumferential direction of the adjustment sleeve 30, ensures that the worm 10 and worm gear 20 can always be engaged when the adjustment sleeve 30 can rotate by a preset amount of rotation. In addition, the offset distance between the third central axis O3 and the first central axis O1 may be determined according to the adjustment requirements of the intertooth groove, but is not particularly limited herein.

[0036] In some embodiments, as shown in Figures 1, 2, and 4, a flange 31 is provided at the end of the adjustment sleeve 30, and the flange 31 is located at one end of the adjustment sleeve 30 (the left end as shown in Figure 2), near the rear end of the worm 10. The flange 31 and / or the gearbox housing 40 is provided with a first elongated hole 32 extending circumferentially, i.e., the first elongated hole 32 may be located on the flange 31, and (as in this embodiment) the gearbox housing 40 is provided with a plurality of threaded holes at positions corresponding to the flange 31, or the flange 31 is provided with threaded holes and the gearbox housing 40 is also provided with the first elongated hole 32 at positions corresponding to the flange 31.

[0037] In some embodiments, as shown in Figures 1 and 5, when the adjustment sleeve 30 is pre-installed in the gearbox housing 40 and the adjustment sleeve 30 has rotated to satisfy the requirements of the intertooth groove between the worm gear 20 and the worm 10, the first fastener 71 passes through the first elongated hole 32, is inserted into the threaded hole of the gearbox housing 40, and then tightened to achieve fixation of the adjustment sleeve 30 and the gearbox housing 40. At this point, the second center distance between the worm 10 and the worm gear 20 is determined, and the position of the worm 10 no longer changes.

[0038] The length of the first elongated hole 32 along the circumferential direction (or the central angle θ1 of the first elongated hole 32) can, on the one hand, limit the amount of rotation of the adjustment sleeve 30. This can avoid phenomena such as excessive torque transmission or severe gear wear that occur when the second center distance D2 between the worm 10 and the worm gear 20 is too far or too close, due to the amount of rotation of the adjustment sleeve 30 being too large, and it can also save time for adjusting the amount of rotation of the adjustment sleeve 30. On the other hand, the adjustment sleeve 30 rotates around the third central axis O3, driving the first elongated hole 32 on the flange 31 to also rotate around the third central axis O3, the length of the first elongated hole 32 along the circumferential direction being within a preset amount of rotation of the adjustment sleeve 30, and the first elongated hole 32 being able to always cover the threaded hole of the gearbox housing 40 along the circumferential direction, so that the first fastener 71 can be tightened in the threaded hole on the gearbox housing 40 after passing through the first elongated hole 32, thereby achieving fixation of the adjustment sleeve 30 and the gearbox housing 40.

[0039] In some embodiments, the flange 31 is provided with two first elongated holes 32 in the circumferential direction, and the two first elongated holes 32 may be provided centrally and symmetrically. Thus, when the adjustment sleeve 30 is fixed to the gearbox housing 40 via the flange 31, the circumferential forces can be made more uniform.

[0040] In some embodiments, the adjustment device 100 for the intertooth groove between the worm gear and the worm further comprises a motor housing 50 and a motor output shaft 60, the motor output shaft 60 being located within the motor housing 50 and having a fixed position, the motor output shaft 60 being able to rotate around a fourth central axis O4 relative to the motor housing 50, and the motor output shaft 60 being used to transmit motor torque to the worm 10 through a coupling.

[0041] Furthermore, the adjustment device 100 for the intertooth groove between the worm gear and the worm further comprises a plumb coupling 80 that is flexibly and securely connected between the worm 10 and the motor output shaft 60.

[0042] The plum coupling 80 comprises two rigid metal shaft sleeves 81 and a plum rubber pad 82, the plum rubber pad 82 being located between the two metal shaft sleeves 81, and the plum coupling 80 possesses both a specific deformation capacity and a specific rigidity. Specifically, the two metal shaft sleeves 81 are sleeved in a torsion-resistant manner at the ends of the worm 10 and the motor output shaft 60, respectively, and the plum rubber pad 82 is located between the end face of the worm 10 and the end face of the motor output shaft 60. The plum rubber pad 82 allows for a flexible connection between the worm 10 and the motor output shaft 60 and can isolate the impact force and protect the motor when the worm 10 is subjected to an external impact force. The plum rubber pad 82 is usually made of rubber or polyurethane. The metal shaft sleeves 81 allow the plum coupling 80 to have a specific rigidity, thereby ensuring stable transmission and output of motor torque.

[0043] Furthermore, a connecting plate 41 is provided at the end of the reduction gear housing 40, and a second elongated hole 42 extending circumferentially is provided on the connecting plate 41 of the reduction gear housing 40, and a screw hole 51 is provided at one end of the motor housing 50 near the connecting plate 41 of the reduction gear housing 40, and the position of the screw hole 51 on the motor housing 50 is fixed, that is, the position of the screw hole 51 relative to the motor output shaft 60 is fixed.

[0044] After the adjustment sleeve 30 rotates to meet the requirements of the intertooth groove between the worm 10 and the worm gear 20, the adjustment sleeve 30 is fixed to the reducer housing 40, and as a result, the position of the worm 10 is also fixed. The motor output shaft 60 is transmitted to the worm 10 through the plum 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 elongated hole 42 is used to align with the threaded hole 51, and the second fastener 72 is inserted into the threaded hole 51 after passing through the second elongated hole 42 and then tightened, thereby fixing the reducer housing 40 and the motor housing 50.

[0045] From the above, it can be seen that the first central axis O1 of the worm 10 can perform circular motion around the third central axis O3 as an axis. 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 central axis O1 of the worm 10. Furthermore, since the positions of the motor output shaft 60, motor housing 50, and screw hole 51 are constant, the entire motor is equivalent to being adjusted by the motor output shaft 60 along the motion trajectory of the first central axis O1 of the worm 10. Therefore, under different requirements for the intertooth groove between the worm gear 20 and the worm 10, the position of the motor housing 50 will also be different.

[0046] As shown in Figure 6, the connecting plate 41 of the reduction gear housing 40 is provided with a second elongated hole 42, the central angle θ2 of the second elongated hole 42 being greater than or equal to the central angle θ1 of the first elongated hole 32. Thus, when the motor housing 50 is in different positions, the screw holes on the motor housing 50 can always be fitted into the second elongated hole 42 along the circumferential direction, thereby satisfying the installation of the motor housing 50 in multiple positions under various requirements of the intertooth groove between the worm gear 20 and the worm 10.

[0047] In some embodiments, the connecting plate 41 of the gearbox housing 40 is provided with two second elongated holes 42 in the circumferential direction. The two second elongated holes 42 can enable a fixed connection between the connecting plate 41 of the gearbox housing 40 and the motor housing 50, resulting in more uniform force distribution.

[0048] Based on the same concept of the invention, this disclosure provides a steering transmission mechanism for a vehicle steering transmission system, comprising an adjustment device 100 for the intertooth groove between the worm gear and the worm, as described above. Specific embodiments relating to the functions achieved by the steering transmission mechanism in the above embodiments have been described in detail in embodiments relating to the adjustment device for the intertooth groove between the worm gear and the worm, but these are not described or illustrated herein.

[0049] In this disclosure, “multiple” refers to two or more, and the same can be said for other quantifiers. “And / or” expresses a correspondence between related objects, indicating that three relationships are possible. For example, A and / or B could mean three things: A always exists, A and B exist simultaneously, and B always exists. The letter “ / ” generally indicates that the related objects of the former and latter are in an “or” relationship. The singular forms “a,” “an,” “said,” and “the” are also intended to include the plural form unless the context explicitly indicates otherwise.

[0050] While terms such as "first" and "second" are used to describe various structures, it should be understood that these structures should not be limited to these terms. These terms are used solely to distinguish structures of the same kind from one another and do not imply any particular order or importance. In practice, expressions such as "first" and "second" can be used completely interchangeably. For example, without departing from the scope of this disclosure, the first structure may also be referred to as the second structure, and similarly, the second structure may also be referred to as the first structure.

[0051] It should be further understood that, based on the orientation or positional relationship shown in the attached drawings, terms such as “center,” “longitudinal,” “lateral,” “front,” “back,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “upper,” “lower,” “inside,” and “outside” used to indicate orientation or positional relationship are not intended to indicate or imply any device or component that has a particular orientation or is required to be configured and operate in a particular orientation, but are merely intended to facilitate the description of the embodiments and simplify the explanation.

[0052] Having considered this specification and implemented the inventions disclosed herein, a person skilled in the art will readily conceive of other embodiments of this disclosure. This application is intended to cover all variations, uses, or adaptive changes of this disclosure, which are in line with the general principles of this disclosure and include well-known facts or customary technical means not disclosed herein. This specification and embodiments are to be considered merely illustrative, and the true scope of this disclosure is set forth in the following claims.

[0053] Please understand that this disclosure is not limited to the exact structure described above and shown in the accompanying drawings, and that various modifications and changes may be made without departing from its scope. The scope of this disclosure is limited only by the attached claims.

Claims

1. An adjustment device (100) for the intertooth groove between the worm gear and the worm, A worm (10) that can rotate around a first central axis (O1), A worm gear (20) that can rotate around a second central axis (O2) and engages with the worm (10), An adjustment sleeve (30) is provided, wherein the sleeve is attached to the outside of the worm (10), allowing the worm (10) to rotate within the adjustment sleeve (30) around the first central axis (O1), An adjustment device (100) for the intertooth groove between a worm gear and a worm, wherein the adjustment sleeve (30) is positioned eccentrically with respect to the worm (10), and by rotating the adjustment sleeve (30), the position of the first central axis (O1) of the worm (10) changes to adjust the central distance between the first central axis (O1) and the second central axis (O2) of the worm gear (20), thereby achieving adjustment of the intertooth groove between the worm (10) and the worm gear (20).

2. The end of the adjustment sleeve (30) is provided with a flange (31), the flange (31) is provided with a first elongated hole (32) extending circumferentially, and the adjustment device (100) for the intertooth groove between the worm gear and the worm further comprises a reduction gear housing (40), the adjustment sleeve (30) is located within the reduction gear housing (40), Adjustment device (100) for the intertooth groove between a worm gear and a worm according to claim 1, wherein the adjustment sleeve (30) can always be fixedly connected to the reduction gear housing (40) through the first elongated hole (32) within a preset range of rotation.

3. The adjustment device (100) for the intertooth groove between the worm gear and the worm, A motor housing (50), wherein a screw hole (51) is provided at the end of the motor housing (50), The motor housing (50) further comprises a motor output shaft (60) located within the motor housing (50) and configured to be transmitted to the worm (10), and by adjusting the motor output shaft (60) to be coaxial with the worm (10), the position of the motor housing (50) changes. Adjustment device (100) for intertooth groove between worm gear and worm according to claim 2, wherein a connecting plate (41) is further provided at the end of the reduction gear housing (40), the connecting plate (41) having a second elongated hole (42) extending circumferentially thereon, the second elongated hole (42) always covering the threaded hole (51) circumferentially after the position of the motor housing (50) has changed.

4. Adjustment device (100) for intertooth grooves between a worm gear and a worm according to claim 2, wherein the outer wall of the adjustment sleeve (30) fits into the inner wall of the reduction gear housing (40), and the adjustment sleeve (30) is able to rotate within the reduction gear housing (40) about a third central axis (O3) before the adjustment sleeve (30) is fixed to the reduction gear housing (40).

5. Adjustment device (100) for intertooth groove between a worm gear and a worm according to claim 4, wherein the worm (10) comprises a front bearing (11) and a rear bearing (12), the front bearing (11) and the rear bearing (12) each having sleeves attached to both ends of the worm (10), and used to allow the worm (10) to rotate within the adjustment sleeve (30) about the first central axis (O1) and to make the first central axis (O1) parallel to the third central axis (O3).

6. Adjustment device (100) for an intertooth groove between a worm gear and a worm, according to claim 1, wherein the intermediate portion of the adjustment sleeve (30) is provided with an opening (33) used to allow the worm (10) located within the adjustment sleeve (30) to contact and engage with the worm gear (20).

7. The adjustment device (100) for the intertooth groove between the worm gear and the worm further comprises a plum coupling (80) flexibly and securely connected between the worm (10) and the motor output shaft (60), as described in claim 3.

8. Adjusting device (100) for intertooth grooves between a worm gear and a worm according to claim 2, wherein the flange (31) is provided with two of the first elongated holes (32) in the circumferential direction.

9. Adjusting device (100) for intertooth grooves between a worm gear and a worm according to claim 3, wherein the connecting plate (41) of the reduction gear housing (40) is provided with two of the second elongated holes (42) in the circumferential direction.

10. A steering transmission mechanism for a vehicle steering transmission system, comprising an adjustment device (100) for the intertooth groove between a worm gear and a worm according to any one of claims 1 to 9.

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