Transmission structure, actuator, rear wheel steering assembly and vehicle

Abstract

The utility model provides a transmission structure, an actuator, a rear wheel steering assembly and a vehicle. The transmission structure comprises a rotating nut, the inner circumferential face of the rotating nut is provided with a tooth-shaped structure, and the rotating nut is suitable for being in transmission connection with the lead screw; the rotating wheel is suitable for being in transmission connection with the driving part through a transmission part; the rotating wheel is fixedly connected with the rotating nut, and the axis of the rotating wheel is coaxial with the axis of the rotating nut; a mounting cavity is formed in the side, away from the rotating nut, of the rotating wheel and suitable for mounting a first bearing so as to position and fix the mounting position of the rotating wheel. According to the scheme, the bearing supporting position is arranged in the center of the rotating wheel, the radial size is small, a cantilever structure is avoided, displacement or deformation of the rotating wheel caused by tensioning force of a transmission part is avoided, meanwhile, a supporting structure does not need to be arranged at the position symmetrical to the rotating wheel in the axial direction, and the axial size is small; the problems of warping and abnormal jumping of one end of the rotating nut can be solved in a limited space.

Description

Technical Field

[0001] This utility model relates to the field of vehicles, and in particular to a transmission structure, actuator, rear wheel steering assembly, and vehicle. Background Technology

[0002] With the application of rear-wheel steering technology, vehicles can achieve functions such as compass steering and crab steering, making vehicle driving more flexible and intelligent.

[0003] Rear-wheel steering systems typically employ a synchronous pulley and nut-screw transmission structure. The synchronous pulley and nut are fixedly connected. The motor transmits its shaft rotation to the synchronous pulley via the synchronous belt. The nut rotates with the pulley, causing the screw to move axially, thus steering the wheel. Due to limited space at the rear wheels, rear-wheel steering systems generally require minimal axial dimensions in the linear motion direction and minimal radial dimensions in the rotational motion direction.

[0004] In a limited space, related technologies place the support bearing at the end of the nut that protrudes from the synchronous pulley, forming a cantilever structure. In this way, the tension of the synchronous belt will be applied to the nut through the synchronous pulley, causing one end of the nut to warp, resulting in uneven force on the transmission structure and poor movement. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a transmission structure that makes the transmission force between the rotating wheel and the nut screw more balanced and the operation more stable in a limited space. Furthermore, it provides an actuator, a rear wheel steering assembly, and a vehicle.

[0006] Firstly, a transmission structure is provided. The transmission structure includes:

[0007] A rotary nut, wherein the inner circumferential surface of the rotary nut has a toothed structure, suitable for connection with a lead screw drive;

[0008] A rotating wheel is adapted to be connected to a driving component via a transmission component; the rotating wheel is fixedly connected to a rotating nut, and the axis of the rotating wheel is coaxial with the axis of the rotating nut; a mounting cavity is formed on the side of the rotating wheel away from the rotating nut, and the mounting cavity is adapted to install a first bearing to position and fix the mounting position of the rotating wheel.

[0009] The advantages of this transmission structure are as follows: The rotating wheel has a mounting cavity on the side away from the rotating nut. This cavity is suitable for mounting a bearing to position and fix the rotating wheel. Compared to related technologies where the rotating wheel is embedded in the center of the rotating nut, this solution provides a bearing support at the center of the rotating wheel, resulting in a smaller radial dimension and avoiding a cantilever structure. This prevents displacement or deformation of the rotating wheel caused by the tension force of the transmission components. Furthermore, it eliminates the need for a support structure symmetrically positioned relative to the rotating wheel axially, resulting in a smaller axial dimension. In summary, this transmission structure can improve the problem of warping and abnormal runout at one end of the rotating nut within a limited space, resulting in more balanced transmission force and more stable operation.

[0010] Secondly, an actuator is provided. The actuator includes the aforementioned transmission structure, drive member, drive pulley, transmission component, first bearing, lead screw, and housing; the drive member is connected to the housing, and the transmission structure and the lead screw are disposed within the inner cavity of the housing; the drive pulley is mounted on the rotating shaft of the drive member, the transmission component is connected to the rotating wheel and the drive pulley, and the rotating nut is sleeved on the lead screw for meshing transmission; the first bearing is disposed in the mounting cavity, wherein the outer ring of the first bearing is connected to the inner circumferential surface of the mounting cavity, and the inner ring is connected to the housing.

[0011] The beneficial effects of this actuator are as follows: a first bearing is installed in the mounting cavity at the center of the rotating wheel, and the first bearing is mounted on the housing to position and fix the rotating wheel. The first bearing provides the rotating wheel with additional strength and rigidity beyond its own material, and transmits the tension force of the transmission component on the rotating wheel to the housing. It also makes the forces at both ends of the transmission structure, namely the rotating wheel end and the rotating nut end, more balanced. Compared with the related technology where the rotating nut is embedded in the center of the rotating wheel, this solution sets a bearing support at the center of the rotating wheel, resulting in a smaller radial dimension and avoiding a cantilever structure. This prevents displacement or deformation of the rotating wheel caused by the tension force of the transmission component. Furthermore, it eliminates the need for a support structure symmetrically positioned relative to the rotating wheel axially, resulting in a smaller axial dimension. In summary, this actuator can better improve the warping and abnormal jumping of one end of the rotating nut, making the transmission force more balanced and the operation more stable.

[0012] Thirdly, a rear-wheel steering assembly is provided, including the aforementioned transmission structure or brake, having the same beneficial effects as the first and second aspects.

[0013] Fourthly, a vehicle is provided, including the aforementioned transmission structure, brake, or rear-wheel steering assembly, having the same beneficial effects as the first, second, and third aspects.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic diagram of the transmission structure assembly in the relevant technology;

[0017] Figure 2 This is a schematic diagram of a transmission structure according to an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the structure of an actuator according to an embodiment of the present utility model;

[0019] Figure 4 This is a partially enlarged view of an actuator according to an embodiment of the present invention.

[0020] Figure label:

[0021] Housing 1; First housing 11; Second housing 12; Support boss 121; Alternating cavity 121a; Base 121b; Mounting platform 121c;

[0022] Drive component 2; drive pulley 21; lead screw 3; transmission component 4;

[0023] Transmission structure 5; Rotating nut 51; Rotating wheel 52; Connecting part 53; Mounting cavity 521; Receiving cavity 531; First oil seal mounting hole 531a; Second oil seal mounting hole 511; Oil reservoir 512; Limiting boss 513; Boss plane 513a; First thread 514;

[0024] First bearing 6; First limiting member 61; Second bearing 7; Second limiting member 71

[0025] First oil seal 81; Second oil seal 82;

[0026] Pressing surface 111;

[0027] Bearing support position P; first direction D. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] To facilitate understanding of this utility model, the background technology will be further described first. For example... Figure 1 In related technologies, the rotating wheel 52 and the rotating nut 51 are interference-fitted and rotate together. The rotating wheel 52 is press-fitted onto the outer shaft of the rotating nut 51 through its central press-fit inner hole. The outer shaft of the rotating nut 51 protrudes axially from the rotating wheel, and the bearing support P is located at the end of the protruding outer shaft near the drive member 2, thus forming a cantilever structure. Under the tension force of the transmission member 4, one end of the rotating nut 51 is prone to warping, resulting in uneven force distribution and poor movement of the transmission structure. If bearing support positions are provided at both ends of the rotating nut 51 protruding from the rotating wheel 52, the axial dimension will increase.

[0032] The following is for reference. Figure 2-4According to an embodiment of the present invention, a transmission structure 5 is described. The transmission structure 5 includes: a rotating nut 51, the inner circumferential surface of which has a toothed structure, suitable for transmission connection with a lead screw 3; a rotating wheel 52, which is suitable for transmission connection with a driving member 2 via a transmission member 4; the rotating wheel 52 is fixedly connected to the rotating nut 51, and the axis of the rotating wheel 52 is coaxial with the axis of the rotating nut 51; a mounting cavity 521 is formed on the side of the rotating wheel 52 away from the rotating nut 51, the mounting cavity 521 being suitable for mounting a first bearing 6 to position and fix the mounting position of the rotating wheel 52. The toothed structure on the inner circumferential surface of the rotating nut 51 can be a trapezoidal thread or other toothed structure, the rotating wheel 52 can be a pulley, sprocket, or gear, and the transmission member 4 can be a transmission belt, transmission chain, or gear, without limitation.

[0033] This transmission structure features a mounting cavity formed on the side of the rotating wheel away from the rotating nut. This cavity is suitable for mounting a bearing to position and fix the rotating wheel. Compared to related technologies where the rotating wheel is embedded in the center of the rotating nut, this design, with a bearing support at the center of the rotating wheel, results in a smaller radial dimension and avoids a cantilever structure. This prevents displacement or deformation of the rotating wheel caused by the tension force of the transmission components. Furthermore, it eliminates the need for axial support structures symmetrically positioned relative to the rotating wheel, resulting in a smaller axial dimension. In summary, this transmission structure effectively addresses the issues of warping and abnormal runout at one end of the rotating nut within a limited space, leading to more balanced transmission force and more stable operation.

[0034] In this embodiment of the transmission structure, the outer circumferential surface of the rotating wheel 52 has a toothed structure, which is suitable for transmission connection with the driving component (2) through the toothed structure of the meshing transmission component (4). The transmission of the toothed structure is more accurate and reliable. The toothed structure can be a trapezoidal thread or other toothed structures. In this embodiment, the rotating wheel 52 is a synchronous pulley, the transmission component 4 is a synchronous belt, and the toothed structure is a trapezoidal thread.

[0035] In this embodiment of the transmission structure, a connecting portion 53 is formed between the rotating nut 51 and the rotating wheel 52, and a receiving cavity 531 is formed inside the connecting portion 53. The connecting portion allows the rotating wheel 52 and the rotating nut 51 to rotate together, and the receiving cavity 531 formed therein can accommodate related mounting structures, making the axial arrangement of the transmission structure 5 more compact. The connecting portion can be integrally die-cast, machined, or welded, and there are no restrictions on this.

[0036] In this embodiment of the transmission structure, the radial dimension of the outer circumferential surface of the connecting part 53 gradually decreases in the direction extending from the rotating wheel 52 to the rotating nut 51. This design makes the transmission structure lighter and smaller, and facilitates integral die-casting, avoiding uneven wall thickness.

[0037] In this embodiment of the transmission structure, the end of the receiving cavity 531 near the rotating nut 51 includes a first oil seal mounting hole 531a, and the other end of the rotating nut 51 includes a second oil seal mounting hole 511. This makes the axial functional structure arrangement of the transmission structure 5 more compact, achieving the sealing of the transmission lubricating oil between the rotating nut 51 and the lead screw 3 with a shorter axial dimension, ensuring smooth movement of the lead screw.

[0038] In this embodiment of the transmission structure, the toothed structure of the rotating nut 51 is provided with an oil reservoir 512 along its circumference. The oil reservoir 512 is located between the first oil seal mounting hole 531a and the second oil seal mounting hole 511. The oil reservoir 512 is used to store lubricating oil between the rotating nut 51 and the lead screw 3, ensuring smooth movement of the lead screw.

[0039] In this embodiment of the transmission structure, the outer peripheral surface of the rotating nut 51 away from the rotating wheel 52 is suitable for mounting the second bearing 7. The rotating nut 51 includes a limiting boss 513, which is connected to and protrudes from the outer peripheral surface of the rotating nut 51. The limiting boss 513 is used to restrict the movement of the second bearing 7 towards the rotating wheel 52. The limiting boss 513 not only limits movement but also serves as a pressing surface for the second bearing 7, making the bearing installation more flexible.

[0040] Specifically, the limiting boss 513 may have two parallel boss planes 513a in the radial direction, which serve as clamping surfaces when installing the transmission structure 5 and have a weight reduction effect.

[0041] In this embodiment of the transmission structure, the outer circumferential surface of the end of the rotating nut 51 away from the rotating wheel 52 has a first thread 514 for installing the second limiting member 71 to restrict the movement of the second bearing 7 away from the rotating wheel 52. This design facilitates the installation of the second limiting member 71, allows adjustment of the locking torque, and is suitable for second bearings 7 of different widths.

[0042] The actuator of this embodiment includes the aforementioned transmission structure 5, driving component 2, driving pulley 21, transmission component 4, first bearing 6, lead screw 3, and housing 1. The driving component 2 is connected to the housing 1, and the transmission structure 5 and lead screw 3 are disposed within the inner cavity of the housing 1. The driving pulley 21 is mounted on the rotating shaft of the driving component 2, and the transmission component 4 is connected to the rotating wheel 52 and the driving pulley 21. A rotating nut 51 is sleeved on the lead screw 3 for meshing transmission. The first bearing 6 is disposed in the mounting cavity 521, wherein the outer ring of the first bearing 6 is connected to the inner circumferential surface of the mounting cavity 521, and the inner ring is connected to the housing 1. The first bearing 6 can be a ball bearing or a cylindrical bearing; the lead screw 3 can be a trapezoidal thread or other tooth profile; the driving pulley 21, transmission component 4, and rotating wheel 52 can be trapezoidal threads or other tooth profiles, and no limitations are imposed here. In this embodiment, the driving component 2 is a motor, but it can also be other rotary cylinders or other driving forms.

[0043] The actuator's structure features a first bearing 6 mounted in the central mounting cavity 521 of the rotating wheel 52. This first bearing 6 is installed on the housing 1 to position and fix the rotating wheel 52. The first bearing 6 provides the rotating wheel 52 with additional strength and rigidity beyond its material properties, and transmits the tension force from the transmission components to the housing 1. It also balances the forces on both ends of the transmission structure 5—the rotating wheel 52 end and the rotating nut 51 end. Compared to related technologies where the rotating wheel is embedded in the center of the rotating nut, this design simplifies the force distribution on the rotating wheel, as it is not simultaneously subjected to torque and radial force transmitted by the transmission components 4 and the lead screw 3. Its smaller radial dimension eliminates the need for additional axial support structures, preventing displacement or deformation caused by the transmission component's tension force. Furthermore, the axial connection between the rotating wheel and the rotating nut provides a shorter axial force transmission path. In summary, this design effectively addresses the issues of warping and abnormal runout at one end of the rotating nut, resulting in more balanced transmission forces and more stable operation.

[0044] In an embodiment of the actuator of this utility model, the housing 1 includes a first housing 11 and a second housing 12. The first housing 11 is located at one end of the lead screw 3, and the second housing 12 is located at the end of the rotating wheel 52 drive and is fastened to the first housing 11 along a first direction D to form the inner cavity of the housing 1. The first direction is the direction in which the lead screw 3 moves linearly towards the first housing 1. The inner ring of the first bearing 6 is connected to the second housing 12. Since two detachable housings are provided at the end of the rotating wheel 52 drive, it is convenient to install, inspect and maintain the lead screw 3, the transmission structure 5, and the transmission component 4 in the inner cavity of the housing. It is also beneficial to manufacture and process the structure on the second housing 12 that is connected to the first bearing.

[0045] In an embodiment of the actuator of this invention, the second housing 12 includes a support boss 121 and a second housing body. The support boss 121 is fixed to the second housing body. The inner ring of the first bearing 6 is interference-fitted to the support boss 121. The support boss 121 is provided with a clearance cavity 121a, which is used to avoid the axial movement of the lead screw 3. In this design, the structure connecting the second housing 12 and the first bearing 6 also has a clearance cavity, which can increase the movable stroke of the lead screw 3 or shorten the axial dimension of the actuator.

[0046] In an embodiment of the actuator of this utility model, the support boss 121 includes a base 121b and a mounting platform 121c. The base 121b is fixedly connected to the second housing body, and the mounting platform 121c is connected to the base 121b. The inner ring of the first bearing 6 is interference-fitted to the mounting platform 121c, and the radial dimension of the mounting platform 121c is smaller than that of the base 121b. In this design, the structure connecting the second housing 12 and the first bearing 6 has a stepped design. The stepped surface can limit the reverse movement of the first bearing 6 in the first direction D, and can also serve as the press-fit surface of the first bearing 6, making the installation process of the first bearing 6 more flexible. In addition, the base 121b is thicker, which increases the bending strength and rigidity, and the mounting platform 121c is thinner, which can reduce the radial dimension of the first bearing 6 and the rotating wheel 52.

[0047] In an embodiment of the actuator of this utility model, a first limiting member 61 is included. The first limiting member 61 is connected to one end of the mounting platform 121c that extends into the mounting cavity 521, and is used to limit the movement of the first bearing 6 in the first direction D. The first limiting member 61 can be a nut, threadedly connected to the mounting platform 121c, or a snap ring, engaging with the mounting platform 121c. This prevents the first bearing 6 from loosening or shifting due to vibration, temperature, or other factors.

[0048] In an embodiment of the actuator of this utility model, a first oil seal 81 and a second oil seal 82 are further included. The receiving cavity 531 includes a first oil seal mounting hole 531a at one end near the rotating nut 51, and a second oil seal mounting hole 511 at the other end of the rotating nut 51. The first oil seal 81 is installed in the first oil seal mounting hole 531a and is tightly fitted to the lead screw 3 and the rotating nut 51, while the second oil seal 82 is installed in the second oil seal mounting hole 511 and is tightly fitted to the lead screw 3 and the rotating nut 51. This fully utilizes the axial cavity space of the transmission structure 5 to install the oil seals, ensuring the sealing of the lubricating oil between the moving parts of the lead screw 3 and the rotating nut 51.

[0049] In an embodiment of the actuator of this utility model, a second bearing 7 is further included. The outer ring of the second bearing 7 is connected to the housing 1, and the inner ring of the second bearing 7 is connected to the outer peripheral surface of the rotating nut 51. This design makes the force on both ends of the transmission structure 5 more balanced, reduces the runout during rotation, and makes the rotation and transmission of the transmission structure 5 more stable and smooth. Specifically, a press-fit surface 111 can be provided on the housing 1, and the end face of the outer ring of the second bearing 7 abuts against the press-fit surface 111, which facilitates the installation of the second bearing 7 and restricts the movement of the second bearing 7 in the first direction.

[0050] In embodiments of the actuator of this invention, a second limiting member 71 is further included. The second limiting member 71 is connected to the end of the rotating nut 51 away from the rotating wheel 52, and is used to limit the movement of the second bearing 7 relative to the rotating nut 51 in the first direction D. The second limiting member 71 can be a nut, threadedly connected to the rotating nut 51, or a snap ring, engaging with the rotating nut 51. This prevents the second bearing 7 from loosening or shifting due to vibration, temperature, or other factors.

[0051] In an embodiment of the actuator of this utility model, optionally, according to installation process requirements, a first bearing plug 62 can be provided, threadedly connected to one end of the opening of the rotating wheel 52, to fix the first bearing 6 in the axial position of the rotating wheel 52; similarly, a second bearing plug 72 can be provided, threadedly connected to the first housing 11, opposite to the press-fit surface 111 to fix the second bearing in the axial position of the first housing 11. This can better prevent the first bearing 6 and the second bearing 7 from axially shifting, making the transmission more stable.

[0052] The rear wheel steering assembly of this utility model includes the aforementioned transmission structure or actuator, and has the same beneficial effects as the aforementioned transmission structure and actuator. The aforementioned transmission structure or actuator is connected to the rear wheel drive of the vehicle, making the rear wheel steering more stable and reliable.

[0053] The vehicle of this invention includes the aforementioned transmission structure, actuator, or rear-wheel steering assembly, and has the same beneficial effects as the aforementioned transmission structure, actuator, and rear-wheel steering assembly. The vehicle can be a gasoline-powered vehicle, an electric vehicle, a hybrid vehicle, or a other type of vehicle powered by any other energy source; no limitation is made herein.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A transmission structure (5), characterized in that, The transmission structure (5) includes: A rotating nut (51) has a toothed structure on its inner circumferential surface, which is suitable for transmission connection with a lead screw (3); A rotating wheel (52) is adapted to be connected to a driving member (2) via a transmission member (4); the rotating wheel (52) is fixedly connected to the rotating nut (51), and the axis of the rotating wheel (52) is coaxial with the axis of the rotating nut (51); the rotating wheel (52) has a mounting cavity (521) on the side away from the rotating nut (51), and the mounting cavity (521) is adapted to install a first bearing (6) to position and fix the mounting position of the rotating wheel (52).

2. The transmission structure according to claim 1, characterized in that, The outer circumferential surface of the rotating wheel (52) has a toothed structure, which is suitable for transmission connection with the driving member (2) through the toothed structure of the meshing transmission member (4).

3. The transmission structure according to claim 2, characterized in that, A connecting portion (53) is formed between the rotating nut (51) and the rotating wheel (52), and a receiving cavity (531) is formed inside the connecting portion (53).

4. The transmission structure according to claim 3, characterized in that, The radial dimension of the outer peripheral surface of the connecting part (53) gradually decreases in the direction extending from the rotating wheel (52) to the rotating nut (51).

5. The transmission structure according to claim 3, characterized in that, The receiving cavity (531) includes a first oil seal mounting hole (531a) at one end near the rotating nut (51), and the rotating nut (51) includes a second oil seal mounting hole (511) at the other end.

6. The transmission structure according to claim 5, characterized in that, The toothed structure of the rotating nut (51) is provided with an oil reservoir (512) along its circumference, and the oil reservoir (512) is located between the first oil seal mounting hole (531a) and the second oil seal mounting hole (511).

7. The transmission structure according to any one of claims 1-6, characterized in that, The outer peripheral surface of the end of the rotating nut (51) away from the rotating wheel (52) is adapted to mount the second bearing (7). The rotating nut (51) includes a limiting boss (513), which is connected to and protrudes from the outer peripheral surface of the rotating nut (51). The limiting boss (513) is used to restrict the second bearing (7) from moving towards the rotating wheel (52).

8. The transmission structure according to claim 7, characterized in that, The limiting boss (513) has two parallel boss planes (513a) in the radial direction, which are used as clamping surfaces for mounting the transmission structure (5).

9. The transmission structure according to claim 7, characterized in that, The outer circumferential surface of the rotating nut (51) at the end away from the rotating wheel (52) has a first thread (514) for mounting a second limiting member (71) to restrict the second bearing (7) from moving away from the rotating wheel (52).

10. An actuator, characterized in that, The device includes a transmission structure (5), a drive member (2), a drive pulley (21), a transmission member (4), a first bearing (6), a lead screw (3), and a housing (1) as described in any one of claims 1-9; the drive member (2) is connected to the housing (1), the transmission structure (5) and the lead screw (3) are disposed in the inner cavity of the housing (1); the drive pulley (21) is mounted on the shaft of the drive member (2), the transmission member (4) is connected to the rotating wheel (52) and the drive pulley (21), and the rotating nut (51) is sleeved on the lead screw (3) for meshing transmission; the first bearing (6) is disposed in the mounting cavity (521), wherein the outer ring of the first bearing (6) is connected to the inner circumferential surface of the mounting cavity (521), and the inner ring is connected to the housing (1).

11. The actuator according to claim 10, characterized in that, The housing (1) includes a first housing (11) and a second housing (12). The first housing (11) is located at one end of the lead screw (3), and the second housing (12) is located at one end of the rotating wheel (52) and is fastened to the first housing (11) along the first direction (D) to form the inner cavity of the housing (1). The inner ring of the first bearing (6) is connected to the second housing (12).

12. The actuator according to claim 11, characterized in that, The second housing (12) includes a support boss (121) and a second housing body. The support boss (121) is fixed to the second housing body. The inner ring of the first bearing (6) is interference-fitted to the support boss (121). The support boss (121) is provided with a clearance cavity (121a). The clearance cavity (121a) is used to avoid the axial movement of the lead screw (3).

13. The actuator according to claim 12, characterized in that, The support boss (121) includes a base (121b) and a mounting platform (121c). The base (121b) is fixedly connected to the second housing body, and the mounting platform (121c) is connected to the base (121b). The inner ring of the first bearing (6) is interference-fitted to the mounting platform (121c). The radial dimension of the mounting platform (121c) is smaller than that of the base (121b).

14. The actuator according to claim 13, characterized in that, It also includes a first limiting member (61), which is connected to one end of the mounting platform (121c) extending into the mounting cavity (521) for limiting the movement of the first bearing (6) in the first direction (D).

15. The actuator according to claim 10, characterized in that, It also includes a first oil seal (81) and a second oil seal (82). A connecting portion (53) is formed between the rotating nut (51) and the rotating wheel (52). A receiving cavity (531) is formed inside the connecting portion (53). One end of the receiving cavity (531) near the rotating nut (51) includes a first oil seal mounting hole (531a), and the other end of the rotating nut (51) includes a second oil seal mounting hole (511). The first oil seal (81) is installed in the first oil seal mounting hole (531a) and is close to the lead screw (3) and the rotating nut (51). The second oil seal (82) is installed in the second oil seal mounting hole (511) and is close to the lead screw (3) and the rotating nut (51).

16. The actuator according to any one of claims 10-15, characterized in that, The actuator also includes a second bearing (7), the outer ring of which is connected to the housing (1), and the inner ring of which is connected to the outer circumferential surface of the rotating nut (51).

17. The actuator according to claim 16, characterized in that, It also includes a second limiting member (71), which is connected to the end of the rotating nut (51) away from the rotating wheel (52) to limit the movement of the second bearing (7) relative to the rotating nut (51) in a first direction (D).

18. A rear-wheel steering assembly, characterized in that, It includes the transmission structure as described in any one of claims 1-9 or the actuator as described in any one of claims 10-17.

19. A vehicle, characterized in that, Includes the transmission structure as described in any one of claims 1-9, the actuator as described in any one of claims 10-17, or the rear wheel steering assembly as described in claim 18.

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