Wheel active steering mechanism and vehicle

Abstract

The utility model provides a wheel active steering mechanism and a vehicle. In the wheel active steering mechanism, a nut of a ball screw is connected with a wheel, a transmission part is in transmission connection with a screw of the ball screw, a locking assembly comprises a shell, an elastic part and two locking parts, and the two locking parts are oppositely arranged in the shell in the radial direction of an output shaft; the locking pieces are provided with connecting holes formed in the axial direction of the output shaft, the output shaft is provided with a transmission structure stretching into the connecting holes, and the elastic piece is connected with the two locking pieces. The two locking pieces can get close to each other under the action of the elastic force of the elastic piece to achieve transmission connection of the transmission piece and the output shaft, and can be pressed and locked to the shell under the driving of the wheels, locking of the wheels and the output shaft is achieved, and reverse dragging of the driver is reduced. Due to the fact that the ball screw which does not have a self-locking function and is high in transmission efficiency is adopted by the wheel active steering mechanism to transmit the torque output by the driver, the transmission efficiency of the wheel active steering mechanism is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an active wheel steering mechanism and a vehicle. Background Art

[0002] With the development of vehicle technology, rear-wheel active steering has begun to appear in the public's field of vision. As rear-wheel active steering can improve the flexibility and stability of vehicle control, more and more models are equipped with rear-wheel active steering.

[0003] As rear wheel active steering mechanisms have attracted more and more attention, how to improve the transmission efficiency of rear wheel active steering mechanisms has begun to attract the attention of those skilled in the art. Utility Model Content

[0004] In view of the above problems, the present application provides an active wheel steering mechanism and a vehicle, wherein the active wheel steering mechanism has high transmission efficiency.

[0005] In the first aspect, some embodiments of the present application provide a wheel active steering mechanism, which includes a ball screw, a transmission member, a driver and a locking assembly, the nut of the ball screw is used to connect to the wheel, the transmission member is connected to the screw of the ball screw, the driver includes an output shaft, the locking assembly includes a shell, an elastic member and two locking members, the two locking members are arranged in the shell relative to each other along the radial direction of the output shaft, the locking member is provided with a connecting hole arranged along the axial direction of the output shaft, the output shaft is provided with a transmission structure extending into the connecting hole, and the elastic member is connected to the two locking members; under the action of the elastic force of the elastic member, the two locking members can approach each other to be transmitted and connected to the transmission member; driven by the wheel, the transmission member can drive the two locking members away from each other to be respectively pressed and locked to the inner wall of the shell.

[0006] In the above structure, the two locking members not only move toward each other under the elastic force of the elastic member, achieving a transmission connection between the transmission member and the output shaft, but can also be compressed and locked to the housing when driven by the wheel, locking the wheel and the output shaft and reducing the back-drag of the driver. Because the active wheel steering mechanism includes a locking assembly, the occurrence of back-drag is reduced. The active wheel steering mechanism can use a ball screw with no self-locking function and high transmission efficiency to transmit the torque output by the driver, thereby improving the transmission efficiency of the active wheel steering mechanism.

[0007] According to some embodiments of the present application, the active wheel steering mechanism includes a transmission member that is axially connected to a first portion and a second portion, wherein the first portion is in transmission connection with a screw, and at least a portion of the second portion extends between two locking members. Under the elastic force of an elastic member, the two locking members can clamp the second portion and achieve transmission connection with the second portion. By configuring the two locking members to clamp the second portion from the outside under the elastic force of the elastic member, the second portion can be clamped by the two locking members, thereby achieving transmission connection between the second portion and the locking members.

[0008] According to some embodiments of the present application, the active wheel steering mechanism is provided with two radially opposed connecting surfaces on the outer surface of the second portion, and the connecting surfaces are capable of abutting against the locking member. By providing two radially opposed, spaced connecting surfaces on the outer surface of the second portion, the locking member abuts against the connecting surfaces, thereby enabling the two locking members to clamp the second portion from the connecting surfaces on both sides.

[0009] According to the active wheel steering mechanism provided in some embodiments of the present application, the connecting surface is configured as a plane, which not only reduces the processing difficulty of the second part, which is beneficial to reducing the manufacturing cost of the active wheel steering mechanism, but also enables the locking member to transmit the torque to the second part through clamping, reduces the slippage between the locking member and the second part, and enables the locking member to smoothly drive the transmission member to rotate.

[0010] According to the active wheel steering mechanism provided in some embodiments of the present application, the second part includes a clamping part and a supporting part connected to the opposite ends of the clamping part. The connecting surface is arranged on the clamping part, and the supporting part is connected between the two connecting surfaces. Driven by the wheel, the supporting part can resist the locking part and push the two locking parts away from each other.

[0011] According to the wheel active steering mechanism provided in some embodiments of the present application, two elastic members are provided, and the two elastic members are arranged opposite to each other, and the second part is located between the two elastic members, so that the two elastic members can provide stable elastic restoring force for the two locking members, so that the two locking members can stably clamp the second part.

[0012] According to some embodiments of the present application, the active wheel steering mechanism is provided with a first pulley on the screw and a second pulley on the transmission member. The second pulley is connected to the first pulley via a transmission belt, and the diameter of the second pulley is larger than that of the first pulley. By setting the diameter of the second pulley larger than the diameter of the first pulley, the belt drive can reduce the torque transmitted from the wheel end via the ball screw before transmitting it to the transmission member. This can reduce the torque required by the locking assembly to lock the transmission member, thereby reducing the size of the locking assembly, reducing the size of the active wheel steering mechanism, and facilitating the lightweight design of the vehicle.

[0013] According to the active wheel steering mechanism provided in some embodiments of the present application, the connecting hole is configured in an arched shape. By configuring the connecting hole in an arched shape, the radial dimensions of the connecting hole at both ends of the connecting hole in the circumferential direction of the output shaft are smaller than the radial dimensions of the central portion of the connecting hole. This allows the connecting structure to be more tightly constrained in the connecting hole when it tends to move in the circumferential direction of the output shaft, thereby improving the stability of the torque transmitted by the connecting structure to the locking ring.

[0014] According to the active wheel steering mechanism provided in some embodiments of the present application, there is a gap between the transmission structure and the inner wall of the connecting hole in the radial direction, so that the transmission structure and the locking member have moving space in the radial direction, so that the locking member can move back and forth in the radial direction under the action of the elastic member and the second part, so that the locking member can clamp the second part to achieve a transmission connection with the second part, and can also abut against the inner wall of the shell to achieve locking of the transmission member.

[0015] According to the active wheel steering mechanism provided in some embodiments of the present application, the shell is configured as a cylindrical structure, and the outer surface of the locking member has an arc-shaped surface, which can fit and press tightly against the inner wall of the shell.

[0016] According to the active wheel steering mechanism provided in some embodiments of the present application, the locking member includes a locking portion and a connecting portion that are interconnected, the connecting portion and the locking portion form a connecting hole, the arcuate surface is provided on the locking portion, and the connecting portion can be transmission-connected to the transmission member.

[0017] In a second aspect, some embodiments of the present application provide a vehicle comprising wheels and an active wheel steering mechanism provided by any of the above technical solutions, wherein the active wheel steering mechanism is used to drive the wheels to steer.

[0018] The technical solutions provided by the embodiments of the present disclosure bring at least the following beneficial effects:

[0019] The present application provides a wheel active steering mechanism, the wheel active steering mechanism comprising a ball screw, a transmission member, a driver, and a locking assembly, wherein the nut of the ball screw is connected to the wheel, the transmission member is transmission-connected to the screw of the ball screw, the driver comprises an output shaft, the locking assembly comprises a housing, an elastic member, and two locking members, the two locking members being arranged in the housing in a radial direction of the output shaft, the locking members being provided with a connecting hole arranged in an axial direction of the output shaft, the output shaft being provided with a transmission structure extending into the connecting hole, the elastic member being connected to the two locking members, the two locking members being able to move closer to each other under the elastic force of the elastic member to achieve transmission connection to the transmission member, and the transmission member being able to drive the two locking members away from each other to be respectively pressed and locked to the inner wall of the housing. In the above structure, the two locking members can not only move closer to each other under the elastic force of the elastic member to achieve transmission connection between the transmission member and the output shaft, but can also be pressed and locked to the housing under the drive of the wheel, thereby locking the wheel and the output shaft and reducing back drag on the driver. Since the active wheel steering mechanism has a locking component, the occurrence of back-dragging is reduced. The active wheel steering mechanism can use a ball screw that does not have a self-locking function and has a higher transmission efficiency to transmit the torque output by the driver, thereby improving the transmission efficiency of the active wheel steering mechanism.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the accompanying drawings, the same reference numerals are used to denote the same components.

[0022] Figure 1 A schematic structural diagram of the active wheel steering mechanism provided in some embodiments of the present application;

[0023] Figure 2 A schematic diagram of a portion of the structure of the active wheel steering mechanism provided in some embodiments of the present application;

[0024] Figure 3 A schematic structural diagram of a housing in a wheel active steering mechanism provided in some embodiments of the present application in one state;

[0025] Figure 4 This is a schematic structural diagram of the housing in the active wheel steering mechanism provided in some embodiments of the present application in another state.

[0026] In the accompanying drawings: 1, ball screw; 11, screw; 12, nut;

[0027] 2. Transmission member; 21. First portion; 22. Second portion; 221. Clamping portion; 2211. Connecting surface; 222. Abutting portion;

[0028] 3. Driver; 31. Output shaft; 311. Transmission structure;

[0029] 4. Locking assembly; 41. Housing; 42. Elastic member; 43. Locking member; 431. Locking portion; 432. Connecting portion; 433. Connecting hole;

[0030] 51. First pulley; 52. Second pulley; 53. Drive belt; 6. Wheel. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0032] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0033] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0034] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0035] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0036] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] As people's living standards continue to improve, vehicles are becoming increasingly inseparable from their lives, and people's demands for vehicle handling performance are becoming increasingly higher. Because rear-wheel active steering can improve vehicle handling flexibility and stability, models equipped with rear-wheel active steering are gaining increasing attention.

[0038] The main principle of rear-wheel active steering is to use the torque output by the driver to drive the steering of the vehicle's rear wheels, which can enable the vehicle to obtain a smaller turning diameter, achieve crab-shaped movement under special working conditions, and reduce body roll or yaw.

[0039] Because, under certain operating conditions, the rear wheels are subject to significant reverse ground force during steering, which can drag and damage the driver, rear-wheel active steering mechanisms typically require a reverse locking mechanism. Existing rear-wheel active steering mechanisms primarily use trapezoidal screws and planetary roller screws to transmit torque from the driver and achieve reverse locking. However, these solutions suffer from significantly low transmission efficiency, hindering overall vehicle system energy consumption.

[0040] In order to improve the transmission efficiency of a rear wheel active steering mechanism, some embodiments of the present application provide a wheel active steering mechanism, the wheel active steering mechanism comprising a ball screw, a transmission member, a driver, and a locking assembly, wherein the nut of the ball screw is connected to the wheel, the transmission member is transmission-connected to the screw of the ball screw, the driver comprises an output shaft, the locking assembly comprises a housing, an elastic member, and two locking members, the two locking members being arranged in the housing in a radial direction of the output shaft, the locking members being provided with a connecting hole arranged in an axial direction of the output shaft, the output shaft being provided with a transmission structure extending into the connecting hole, the elastic member being connected to the two locking members; under the elastic force of the elastic member, the two locking members can move closer to each other to achieve transmission connection to the transmission member; under the drive of the wheel, the transmission member can drive the two locking members away from each other to be respectively pressed and locked to the inner wall of the housing. In the above structure, the two locking members can not only move closer to each other under the elastic force of the elastic member to achieve transmission connection between the transmission member and the output shaft, but can also be pressed and locked to the housing under the drive of the wheel, thereby locking the wheel and the output shaft and reducing back drag on the driver. Since the active wheel steering mechanism has a locking component, the occurrence of back-dragging is reduced. The active wheel steering mechanism can use a ball screw that does not have a self-locking function and has a higher transmission efficiency to transmit the torque output by the driver, thereby improving the transmission efficiency of the active wheel steering mechanism.

[0041] The active wheel steering mechanism described in the embodiments of the present application can be applied to vehicles. The vehicles can be fuel vehicles, gas vehicles, or new energy vehicles. The new energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles.

[0042] The following further describes the technical solutions of the active wheel steering mechanism and vehicle provided in the specific implementation manner of this application.

[0043] Some embodiments of the present application provide a wheel 6 active steering mechanism, such as Figures 1 to 4 As shown, the active steering mechanism of the wheel 6 includes a ball screw 1, a transmission member 2, a driver 3 and a locking assembly 4. The nut 12 of the ball screw 1 is used to connect with the wheel 6. The transmission member 2 is transmission-connected to the screw 11 of the ball screw 1. The driver 3 includes an output shaft 31. The locking assembly 4 includes a housing 41, an elastic member 42 and two locking members 43. The two locking members 43 are arranged in the housing 41 relative to each other along the radial direction of the output shaft 31. The locking member 43 is provided with a connecting hole 433 arranged along the axial direction of the output shaft 31. The output shaft 31 is provided with a transmission structure 311 extending into the connecting hole 433. The elastic member 42 is connected to the two locking members 43; under the elastic force of the elastic member 42, the two locking members 43 can approach each other to be transmission-connected to the transmission member 2; driven by the wheel 6, the transmission member 2 can drive the two locking members 43 to move away from each other so as to be respectively pressed and locked on the inner wall of the housing 41.

[0044] The ball screw 1 is a device that can convert rotary motion into linear motion, or vice versa. In the active steering mechanism of the wheel 6, it can convert the torque output by the driver 3 into a force that drives the wheel 6 to steer, thereby achieving active steering of the wheel 6.

[0045] The ball screw 1 may include a screw rod 11 and a nut 12 that are connected in a transmission manner. When the screw rod 11 acts as the active rotating body, the nut 12 will convert the rotation angle of the screw rod 11 into linear motion according to the lead of the corresponding specification. The passive workpiece can be connected to the nut 12 through the nut 12 seat, thereby realizing the corresponding linear motion.

[0046] By setting the nut 12 of the ball screw 1 to be connected to the wheel 6, the ball screw 1 can drive the wheel 6 to steer through the linear motion of the nut 12 after converting the obtained rotational motion into the linear motion of the nut 12; or the ball screw 1 can apply the force to the wheel 6 through the nut 12 after converting the obtained torque into the force acting on the nut 12.

[0047] The transmission member 2 can be a component for transmitting power between the locking assembly 4 and the ball screw 1. As a component for transmitting power, it is connected to the screw 11 and the locking assembly 4. For example, the transmission member 2 can be a shaft-like component that is arranged axially along the output shaft 31 of the driver 3 so that the rotation of the output shaft 31 can be smoothly transmitted to the transmission member 2.

[0048] The driver 3 can be a device that can be used as a power output for the active steering mechanism of the wheel 6, and is used to provide the active steering mechanism with a force to drive the wheel 6 to turn. The output shaft 31 serves as the power output end of the driver 3 and outputs torque to the transmission member 2.

[0049] The locking assembly 4 may refer to a component that can both connect the transmission member 2 and the output shaft 31 of the driver 3 through transmission, and a group of devices that can lock the transmission member 2 and the output shaft 31 of the driver 3 .

[0050] Housing 41 may be the outer shell structure of locking assembly 4, used to accommodate other components of locking assembly 4. Both elastic member 42 and locking member 43 are housed in housing 41. Locking member 43 can be used both to transmit power between output shaft 31 and transmission member 2 and to lock the output shaft 31 and transmission member 2. Elastic member 42 may be a device with elastic restoring force, which can apply a force to locking member 43 using its own elastic restoring force, thereby achieving a good transmission connection between locking member 43 and transmission member 2.

[0051] The two locking members 43 are disposed in the housing 41 in a radially opposed manner relative to the output shaft 31. This may mean that the two locking members 43 are spaced apart and arranged radially relative to the output shaft 31, with the central axis of the output shaft 31 as the center. By disposing the two locking members 43 in a radially opposed manner relative to the output shaft 31, the locking members 43 are both eccentrically disposed relative to the central axis of the output shaft 31, facilitating torque transmission from the output shaft 31 to the locking members 43.

[0052] The connecting hole 433 may be a hole-shaped structure provided on the locking member 43. By arranging the connecting hole 433 along the axial direction of the output shaft 31, a portion of the output shaft 31 can be conveniently inserted into the connecting hole 433 to transmit torque to the locking member 43.

[0053] The transmission structure 311 can be a structure protruding along the axial direction of the output shaft 31, which is used to transmit torque to the locking member 43. Because the locking member 43 is eccentrically arranged relative to the central axis of the output shaft 31, the transmission structure 311 can easily transmit torque to the locking member 43 or drive the locking member 43 to rotate by extending into the connecting hole 433.

[0054] The elastic member 42 is connected to the two locking members 43, which may mean that the elastic member 42 is connected between the two locking members 43. The elastic member 42 can use its own elastic restoring force to drive the two locking members 43 to move. The elastic member 42 can be a tension spring, which is connected between the two locking members 43. Its own elastic restoring force drives the two locking members 43 toward each other and simultaneously connects the two locking members 43 to the transmission member 2, so that the torque of the output shaft 31 can be transmitted to the transmission member 2 through the locking assembly 4.

[0055] Driven by the wheel 6, the transmission member 2 can drive the two locking members 43 away from each other so as to be pressed and locked on the inner wall of the shell 41 respectively. This means that when the wheel 6 is subjected to a reaction force, the reaction force will be transmitted to the transmission member 2 through the ball screw 1, driving the transmission member 2 to rotate. The active rotation of the transmission member 2 can drive the two locking members 43 to overcome the elastic restoring force of the elastic member 42 and move away from each other until they are pressed and locked on the inner wall of the shell 41.

[0056] By configuring the transmission member 2 to be able to drive the two locking members 43 to overcome the elastic restoring force of the elastic member 42 and move away from each other under the drive of the wheel 6, and to be pressed and locked to the inner wall of the shell 41, the active steering mechanism of the wheel 6 can be locked, reducing the occurrence of back-dragging.

[0057] In the above structure, the two locking members 43 can not only be moved toward each other by the elastic force of the elastic member 42 to achieve a transmission connection between the transmission member 2 and the output shaft 31, but can also be pressed and locked to the housing 41 under the drive of the wheel 6, thereby locking the wheel 6 and the output shaft 31 and reducing the back-drag of the driver 3. Because the active steering mechanism of the wheel 6 includes the locking assembly 4, the occurrence of back-drag is reduced. The active steering mechanism of the wheel 6 can use the ball screw 1, which does not have a self-locking function and has a high transmission efficiency, to transmit the torque output by the driver 3, thereby improving the transmission efficiency of the active steering mechanism of the wheel 6.

[0058] In some embodiments, the transmission member 2 includes a first part 21 and a second part 22 connected axially, the first part 21 is transmission-connected to the screw 11, and at least part of the second part 22 extends between the two locking members 43. Under the elastic force of the elastic member 42, the two locking members 43 can clamp the second part 22 and be transmission-connected to the second part 22.

[0059] The first portion 21 and the second portion 22 may be two interconnected parts of the transmission member 2. The first portion 21 may be configured for transmission connection with the screw 11, and the second portion 22 may be configured for transmission connection with the locking member 43. By axially connecting the first portion 21 and the second portion 22, the first portion 21 and the second portion 22 are arranged axially, allowing at least a portion of the second portion 22 to conveniently extend axially between the two locking members 43.

[0060] Under the elastic force of the elastic member 42, the two locking members 43 can clamp the second part 22 and be transmission connected to the second part 22, which can mean that under the elastic force of the elastic member 42, the two locking members 43 approach each other, and the two locking members 43 clamp the second part 22 located therebetween. At the same time, when the locking member 43 is driven by the output shaft 31 to rotate, it can drive the second part 22 to rotate, so that the output shaft 31 is transmission connected to the transmission member 2, and the output shaft 31 can drive the transmission member 2 to rotate.

[0061] By configuring the two locking members 43 to clamp the second portion 22 from the outside under the elastic force of the elastic member 42 , the second portion 22 can be clamped by the two locking members 43 to achieve a transmission connection between the second portion 22 and the locking members 43 .

[0062] In some embodiments, two connecting surfaces 2211 arranged radially opposite to each other are provided on the outer surface of the second portion 22 , and the connecting surfaces 2211 can abut against the locking member 43 .

[0063] The connecting surface 2211 may refer to a surface structure provided on the second portion 22, which abuts against the locking member 43 to bear the force of the locking member 43. By providing two connecting surfaces 2211 spaced apart in the radial direction on the outer surface of the second portion 22, the locking member 43 abuts against the connecting surfaces 2211, thereby enabling the two locking members 43 to clamp the second portion 22 from the connecting surfaces 2211 on both sides.

[0064] Exemplarily, the connection surface 2211 is configured as a plane.

[0065] Since flat surfaces are less difficult to machine, configuring the connecting surface 2211 as a flat surface can reduce the difficulty in machining the second portion 22, thereby reducing the manufacturing cost of the active steering mechanism for the wheel 6. Furthermore, the locking member 43 clamps the second portion 22 by providing two radially spaced flat surfaces on the outer surface of the second portion 22. This allows the locking member 43 to effectively transmit torque to the second portion 22 through clamping, thereby reducing slippage between the locking member 43 and the second portion 22 and enabling the locking member 43 to smoothly drive the transmission member 2 to rotate.

[0066] In some embodiments, the connecting surface 2211 may also be configured as a surface structure of other shapes such as an arc surface, a wavy surface, etc., as long as the locking member 43 can clamp the connecting surface 2211 to smoothly transfer the torque to the second portion 22 .

[0067] In some embodiments, the second portion 22 includes a clamping portion 221 and a supporting portion 222 connected to the opposite ends of the clamping portion 221. The connecting surface 2211 is set on the clamping portion 221, and the supporting portion 222 is connected between the two connecting surfaces 2211. Driven by the wheel 6, the supporting portion 222 can resist the locking member 43 and push the two locking members 43 away from each other.

[0068] The clamping portion 221 may be the main structure of the second portion 22, located between the two locking members 43 and clamped by the two locking members 43, and is used to withstand the holding force of the two locking members 43. The abutting portion 222 may be the structure of the second portion 22 for abutting the locking members 43 and applying a force to the locking members 43, and is provided at opposite ends of the clamping portion 221.

[0069] By setting the connecting surface 2211 on the clamping portion 221 and connecting the supporting portion 222 between the two connecting surfaces 2211, the locking member 43 can apply a force to the clamping portion 221 through the connecting surface 2211, and after the second portion 22 rotates relative to the locking member 43, the two supporting portions 222 can respectively abut against the two locking members 43 and push the two locking members 43 to move, so that the two locking members 43 move away from each other.

[0070] Driven by the wheel 6, the supporting portion 222 can resist the locking member 43 and push the two locking members 43 away from each other. This may mean that after the wheel 6 is subjected to the reaction force, the transmission member 2 is actively rotated through the ball screw 1, and the supporting portion 222 applies a force to the locking member 43, so that the locking member 43 overcomes the elastic restoring force of the elastic member 42 and moves, and the two locking members 43 move away from each other.

[0071] The clamping portion 221 and the supporting portion 222 are both located between the two locking members 43, which not only enables the two locking members 43 to transmit a larger torque to the second portion 22, but also makes the transmission between the locking members 43 and the second portion 22 more stable and less likely to be misaligned when the two locking members 43 drive the second portion 22 to rotate; it also makes it difficult for the second portion 22 to transmit a large torque to the two locking members 43. When the second portion 22 actively rotates relative to the locking members 43, it is more likely that the second portion 22 and the locking members 43 will be misaligned, so that the two supporting portions 222 can respectively abut against the two locking members 43 and push the two locking members 43 away from each other.

[0072] In some embodiments, two elastic members 42 are provided, the two elastic members 42 are disposed opposite to each other, and the second portion 22 is located between the two elastic members 42 .

[0073] By arranging two elastic members 42 between the two locking members 43 and arranging the two elastic members 42 relatively spaced apart, the second part 22 is located between the two elastic members 42, so that the two elastic members 42 can provide stable elastic restoring force for the two locking members 43, so that the two locking members 43 can stably clamp the second part 22.

[0074] In some embodiments, a first pulley 51 is provided on the screw 11, and a second pulley 52 is provided on the transmission member 2. The second pulley 52 is connected to the first pulley 51 through a transmission belt 53, and the diameter of the second pulley 52 is larger than the diameter of the first pulley 51.

[0075] The first pulley 51 and the second pulley 52 are both pulleys that can cooperate with the transmission belt 53. By arranging the first pulley 51 on the screw 11 and the second pulley 52 on the transmission member 2, and connecting the second pulley 52 and the first pulley 51 through the transmission belt 53, the first pulley 51, the second pulley 52 and the transmission belt 53 form a belt transmission system to connect the screw 11 and the transmission member 2.

[0076] By setting the diameter of the second pulley 52 to be larger than the diameter of the first pulley 51, the belt drive can reduce the torque transmitted from the end of the wheel 6 via the ball screw 1 and transmit it to the transmission member 2, which can reduce the torque required for the locking assembly 4 to lock the transmission member 2, which is beneficial to reducing the size of the locking assembly 4, and the size of the active steering mechanism of the wheel 6, which is beneficial to the lightweight design of the vehicle.

[0077] In some embodiments, the connection hole 433 is configured in an arch shape.

[0078] By configuring the connecting hole 433 into an arch shape, the radial dimensions of the two ends of the connecting hole 433 in the circumferential direction of the output shaft 31 are smaller than the radial dimensions of the middle part of the connecting hole 433. When the connecting structure has a tendency to move in the circumferential direction of the output shaft 31 in the connecting hole 433, the connecting structure can be more tightly confined in the connecting hole 433, which is beneficial to improving the stability of the connecting structure in transmitting torque to the locking ring.

[0079] In some embodiments, in the radial direction, there is a gap between the transmission structure 311 and the inner wall of the connecting hole 433 .

[0080] By providing a radial gap between the transmission structure 311 and the inner wall of the connecting hole 433, the transmission structure 311 and the locking member 43 have moving space in the radial direction, so that the locking member 43 can move back and forth in the radial direction under the action of the elastic member 42 and the second part 22, so that the locking member 43 can not only clamp the second part 22 to achieve a transmission connection with the second part 22, but also abut against the inner wall of the shell 41 to achieve locking of the transmission member 2.

[0081] In some embodiments, the housing 41 is configured as a cylindrical structure, and the outer surface of the locking member 43 has an arc-shaped surface, which can fit and press tightly against the inner wall of the housing 41 .

[0082] By configuring the housing 41 as a cylindrical structure, the housing 41 occupies a smaller space, can better fit the output shaft 31 and the transmission member 2, and also allows the locking member 43 to rotate conveniently in the housing 41. By providing an arcuate surface on the outer surface of the locking member 43, and making the arcuate surface fit and press against the inner wall of the housing 41, the arcuate surface can increase the contact area between the locking member 43 and the inner wall of the housing 41, which helps to obtain greater friction for the locking member 43 and improve the locking effect of the locking structure on the transmission member 2 and the output shaft 31.

[0083] Exemplarily, the locking member 43 includes a locking portion 431 and a connecting portion 432 connected to each other, the connecting portion 432 and the locking portion 431 form a connecting hole 433, an arcuate surface is provided on the locking portion 431, and the connecting portion 432 can be transmission-connected to the transmission member 2.

[0084] The locking portion 431 and the connecting portion 432 may be different parts of the locking member 43. The locking portion 431 is used to press against the inner wall of the housing 41. The arcuate surface is provided on the locking portion 431, and the friction between the arcuate surface and the inner wall of the housing 41 is used to lock the transmission member 2 and the output shaft 31. The connecting portion 432 is used to support the transmission member 2, so that the connecting portions 432 of the two locking members 43 can transmit torque to the transmission member 2, thereby achieving a transmission connection with the transmission member 2.

[0085] Some embodiments of the present application further provide a vehicle, which includes wheels 6 and an active steering mechanism for the wheels 6 as provided by any of the above technical solutions, wherein the active steering mechanism for the wheels 6 is used to drive the wheels 6 to steer.

[0086] In some embodiments of the present application, the wheel 6 may be a rear wheel of the vehicle. The active steering mechanism of the wheel 6 can improve the flexibility and stability of the vehicle's handling by driving the wheel 6 to steer. For example, in some embodiments of the present application, the wheel 6 may also be another wheel 6 of the vehicle, so that the wheel 6 has the characteristics of a steering wheel, which helps to improve the flexibility and stability of the vehicle's handling.

[0087] Some embodiments of the present application provide a Figure 1 The active steering mechanism of the wheel 6 shown, refer to Figures 2 to 4 The active steering mechanism for the wheel 6 includes a ball screw 1, a transmission member 2, a driver 3, and a locking assembly 4. The nut 12 of the ball screw 1 is used to connect to the wheel 6. The first portion 21 of the transmission member 2 is drivingly connected to the screw 11 of the ball screw 1. The two locking members 43 of the locking assembly 4 are arranged in a housing 41 along the radial direction of the output shaft 31. The second portion 22 of the transmission member 2 extends between the two locking members 43. The clamping portion 221 of the second portion 22 has two connecting surfaces 2211 arranged in radial direction, and abutting portions 222 are provided at opposite ends of the clamping portion 221. The elastic member 42 of the locking assembly 4 is connected between the two locking members 43. The transmission structure 311 on the output shaft 31 extends into a connecting hole 433 on the locking member 43, which is arranged along the axial direction of the output shaft 31. Under the elastic force of the elastic member 42, the two locking members 43 can approach each other and respectively abut against the two connecting surfaces 2211 of the clamping portion 221, thereby clamping the second portion 22 and achieving a transmission connection between the output shaft 31 and the transmission member 2. Driven by the reaction force exerted on the wheel 6, the ball screw 1 drives the transmission member 2 to actively rotate, and the abutting portion 222 abuts against the locking members 43, pushing the two locking members 43 away from each other, pressing and locking them against the inner wall of the housing 41, thereby locking the output shaft 31 and the transmission member 2.

[0088] In the above structure, the two locking members 43 can not only be moved toward each other by the elastic force of the elastic member 42 to achieve a transmission connection between the transmission member 2 and the output shaft 31, but can also be pressed and locked to the housing 41 under the drive of the wheel 6, thereby locking the wheel 6 and the output shaft 31 and reducing the back-drag of the driver 3. Because the active steering mechanism of the wheel 6 includes the locking assembly 4, the occurrence of back-drag is reduced. The active steering mechanism of the wheel 6 can use the ball screw 1, which does not have a self-locking function and has a high transmission efficiency, to transmit the torque output by the driver 3, thereby improving the transmission efficiency of the active steering mechanism of the wheel 6.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A wheel active steering mechanism, characterized in that: include: A ball screw, a nut of which is used to connect with the wheel; A transmission member, which is transmission-connected to the screw of the ball screw; a driver, including an output shaft; The locking assembly includes a shell, an elastic member and two locking members. The two locking members are arranged in the shell relative to each other along the radial direction of the output shaft. The locking member is provided with a connecting hole arranged along the axial direction of the output shaft. The output shaft is provided with a transmission structure extending into the connecting hole. The elastic member is connected to the two locking members. Under the action of the elastic force of the elastic member, the two locking members can approach each other to be transmission-connected to the transmission member. Driven by the wheel, the transmission member can drive the two locking members away from each other to be respectively pressed and locked to the inner wall of the shell.

2. The active wheel steering mechanism according to claim 1, characterized in that: The transmission member includes a first part and a second part connected along the axial direction, the first part is transmission-connected to the screw, and at least a portion of the second part extends between the two locking members. Under the elastic force of the elastic member, the two locking members can clamp the second part and be transmission-connected to the second part.

3. The active wheel steering mechanism according to claim 2, characterized in that: Two connecting surfaces arranged opposite to each other along the radial direction are provided on the outer surface of the second portion, and the connecting surfaces can abut against the locking member.

4. The active wheel steering mechanism according to claim 3, characterized in that: The connecting surface is configured as a plane.

5. The active wheel steering mechanism according to claim 3 or 4, characterized in that: The second part includes a clamping part and a supporting part connected to the opposite ends of the clamping part. The connecting surface is provided on the clamping part, and the supporting part is connected between the two connecting surfaces. Driven by the wheel, the supporting part can resist the locking part and push the two locking parts away from each other.

6. The active wheel steering mechanism according to claim 2, characterized in that: There are two elastic members, which are arranged opposite to each other, and the second portion is located between the two elastic members.

7. The active wheel steering mechanism according to claim 1, characterized in that: A first pulley is provided on the screw rod, and a second pulley is provided on the transmission member. The second pulley is connected to the first pulley via a transmission belt, and the diameter of the second pulley is greater than that of the first pulley.

8. The active wheel steering mechanism according to claim 1, characterized in that: The connecting hole is configured in an arch shape.

9. The active wheel steering mechanism according to claim 1, characterized in that: In the radial direction, there is a gap between the transmission structure and the inner wall of the connecting hole.

10. The active wheel steering mechanism according to claim 1, characterized in that: The shell is configured as a cylindrical structure, and the outer surface of the locking member has an arc-shaped surface, and the arc-shaped surface can be fitted and pressed tightly against the inner wall of the shell.

11. The active wheel steering mechanism according to claim 10, characterized in that: The locking member includes a locking portion and a connecting portion that are connected to each other. The connecting portion and the locking portion enclose the connecting hole. The arcuate surface is provided on the locking portion. The connecting portion can be transmission-connected to the transmission member.

12. A vehicle, characterized in that: It comprises a wheel and the active wheel steering mechanism according to any one of claims 1 to 11, wherein the active wheel steering mechanism is used to drive the wheel to steer.

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