CN218431396U

CN218431396U - Motor vehicle and rear wheel steering actuator thereof

Info

Publication number: CN218431396U
Application number: CN202222603192.8U
Authority: CN
Inventors: 李广; 魏玉艳; 程强; 方宇涵
Original assignee: Hangzhou Shibao Auto Steering Gear Co ltd
Current assignee: Hangzhou Shibao Auto Steering Gear Co ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2023-02-03
Anticipated expiration: 2032-09-28

Abstract

The utility model discloses a motor vehicle and rear wheel steering actuator thereof relates to and turns to technical field, including driving piece, drive assembly, steering screw and bulb seat, the driving piece is connected with drive assembly, the coaxial cover of drive assembly is established in steering screw's periphery, and when the drive piece drive turned to drive assembly and rotates, steering assembly drove steering screw axial displacement, the bulb seat sets up the both ends at steering screw, the bulb seat is used for connecting the tie rod. The rotation axis of the driving piece and the axis of the steering screw are arranged in parallel, the driving piece drives the steering screw to move axially through the transmission assembly, the rear wheel can be pushed to steer through the ball head seat, and the rear wheel and the front wheel rotate relatively when the vehicle is at a low speed or the steering is insufficient, so that the purpose of reducing the turning radius and improving the flexibility of the vehicle is achieved.

Description

Motor vehicle and rear wheel steering actuator thereof

Technical Field

The utility model relates to a turn to technical field, concretely relates to motor vehicle and rear wheel steering actuator thereof.

Background

Along with the development of automobile intellectualization, especially the continuous development of unmanned technique, higher requirement has been put forward to car maneuverability and travelling comfort etc. and present ripe car turns to the technique, mostly is the front wheel and turns to, but the front wheel steering has the low-speed turning radius great when turning to, and mobility is relatively poor problem, along with the automobile quantity that increases constantly every year, relies on the front wheel to turn to and has brought huge challenge for road traveling.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

To the technical problem, the utility model provides a motor vehicle and rear wheel steering actuator thereof, it takes place to rotate at the relative front wheel of rear wheel when the vehicle low-speed or appear turning to inadequately to reach and reduce turning radius and improve the purpose of vehicle flexibility and steady lane change when high-speed.

2. Technical scheme

In order to solve the above problem, the utility model provides a technical scheme does: the utility model provides a rear wheel steering actuator, includes driving piece, drive assembly, steering screw and bulb seat, the driving piece is connected with drive assembly, the coaxial cover of drive assembly is established in steering screw's periphery, when the driving piece drive turns to drive assembly and rotates, turns to the subassembly and drives steering screw axial displacement, the bulb seat sets up the both ends at steering screw, the bulb seat is used for connecting the tie rod that turns to.

Optionally, the transmission assembly comprises a transmission gear and a steering nut, the driving piece drives the transmission gear to rotate, the transmission gear is coaxially sleeved on the periphery of the steering nut, and the steering nut is coaxially sleeved on the periphery of the steering screw rod in a rotating manner.

Optionally, the steering screw periphery wall is equipped with first external screw thread, first external screw thread is followed steering screw axial extension, steering nut internal perisporium has the internal thread, the internal thread meshes with first external screw thread.

Optionally, the ball head seat further comprises a housing, the driving member is mounted on the housing, the transmission gear, the steering nut and a part of the steering screw rod are arranged inside the housing, and the housing is movably abutted to the ball head seat.

Optionally, the ball cup includes a first connecting portion and a second connecting portion, the first connecting portion is connected to the steering screw, and the second connecting portion is used for connecting the tie rod.

Optionally, a through hole for a bolt to pass through is formed in the end portion of the steering screw rod in the axial direction, a screw hole is formed in the first connecting portion in the axial direction, and the first connecting portion is connected with the steering screw rod through a bolt.

Optionally, the first connecting portion has a screw hole, the periphery wall of the end portion of the steering screw rod is provided with a second external thread, the second external thread extends along the axial direction of the steering screw rod, the second external thread is not connected with the first external thread, and the end portion of the steering screw rod penetrates through the screw hole and is matched with the nut.

The utility model also discloses a motor vehicle, including rear wheel, tie rod and the preceding rear wheel steering actuator, the tie rod is connected with the bulb seat, the rear wheel is connected with the tie rod.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

(1) The rear wheel steering actuator that this application embodiment provided, the driving piece passes through drive assembly and drives steering screw axial displacement, can promote the rear wheel through the bulb seat and turn to, the rear wheel rotates with the front wheel incorgruous when the vehicle low-speed or appear turning to inadequately, in order to reach and reduce turning radius and improve the purpose of vehicle flexibility, when the vehicle has the trend that turns to excessive especially high-speed tail flicking, the rear wheel is syntropy with the front wheel and rotates, in order to reduce vehicle barycenter sideslip angle, reduce the steady state overshoot of vehicle yaw rate, realize the steady effect of lane change.

(2) The rear wheel steering actuator that this application embodiment provided drives through driving gear and turns to nut and steering screw motion, realizes the function that slows down and increases the square, reduces the requirement to driving piece namely motor rated torque, makes rear wheel actuator structure more reasonable, reduces the design degree of difficulty.

(3) According to the rear wheel steering actuator provided by the embodiment of the application, when the steering screw rod moves leftwards along the axial direction to a certain distance, the ball seat positioned on the right side of the steering screw rod and the end part of the shell are abutted against each other so as to limit the stroke of the steering screw rod moving leftwards and axially; when the steering screw rod moves to the right along the axial direction to a certain distance, the ball seat positioned on the left side of the steering screw rod and the other end of the shell are abutted with each other to limit the stroke of the steering screw rod moving to the right along the axial direction.

(4) The rear wheel steering actuator that this application embodiment provided, steering screw periphery wall has the second external screw thread, can select the length of steering screw axial displacement according to vehicle installation environment to fix with lock nut, realize the nimble change of steering screw length.

Drawings

Fig. 1 is a schematic structural diagram of a rear wheel steering actuator according to an embodiment of the present invention.

Fig. 2 is a schematic view of a steering screw of a rear wheel steering actuator according to an embodiment of the present invention, which is provided with a screw hole.

Fig. 3 is a schematic view of a steering screw of a rear wheel steering actuator according to an embodiment of the present invention, which is provided with a second thread.

The labels in the various figures are: 1. a drive member; 2. a transmission assembly; 21. a transmission gear; 22. a steering nut; 3. a steering screw; 31. a first external thread; 32. a second external thread; 4. a ball cup seat; 41. a first connection portion; 42. a second connecting portion; 5. a housing; 6. a bolt; 7. a bearing; 8. locking the nut; 9. and a nut.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The utility model discloses in words such as first, second, be for the description the utility model discloses a technical scheme is convenient and set up, does not have specific limited action, is general finger, right the technical scheme of the utility model does not constitute limited action. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the same embodiment and between the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, which is all within the scope of the present invention.

Example 1

With reference to fig. 1-3, the rear wheel steering actuator of this embodiment includes driving piece 1, drive assembly 2, steering screw 3 and bulb seat 4, driving piece 1 is connected with drive assembly 2, the coaxial cover of drive assembly 2 is established in steering screw 3's periphery, and when driving piece 1 drive steering drive assembly 2 rotated, the steering assembly drove steering screw 3 axial displacement, bulb seat 4 sets up the both ends at steering screw 3, bulb seat 4 is used for connecting the tie rod. The rotation axis of driving piece 1 and the 3 axis parallel arrangement of steering screw, driving piece 1 drives the 3 axial displacement of steering screw through drive assembly 2, through the steering of ball headstock 4 indirect promotion rear wheel, the rear wheel rotates with the front wheel incorgruous when the vehicle low-speed or appear turning insufficiently, in order to reach the purpose that reduces turning radius and improve the vehicle flexibility, when the vehicle has the trend of turning excessively especially high-speed tail flicking, the rear wheel is the syntropy with the front wheel and rotates, in order to reduce vehicle barycenter sideslip angle, reduce the steady state overshoot of vehicle yaw rate, realize the steady effect of lane change.

Example 2

With reference to fig. 1 to 3, the rear wheel steering actuator of the present embodiment can be improved as follows compared with the technical solution of embodiment 1: the transmission assembly 2 comprises a transmission gear 21 and a steering nut 22, the driving piece 1 drives the transmission gear 21 to rotate, the transmission gear 21 is coaxially sleeved on the periphery of the steering nut 22, and the steering nut 22 is coaxially sleeved on the periphery of the steering screw rod 3 in a rotating mode. The steering nut 22 and the steering screw rod 3 are driven to move through the transmission gear 21, the functions of speed reduction and torque increase are achieved, the requirement on the rated torque of the driving piece 1, namely a motor, is reduced, the structure of the rear wheel actuator is more reasonable, and the design difficulty is reduced. One end of the transmission gear 21 abuts against the end cover of the steering nut 22, and the other end of the transmission gear 21 abuts against the bearing 7 and the locking nut 8, so that the transmission gear 21 is stably sleeved on the periphery of the steering nut 22, and transmission is achieved.

Example 3

With reference to fig. 1 to 3, the rear wheel steering actuator of the present embodiment can be improved as follows compared with the technical solutions of embodiment 1 or 2: the outer peripheral wall of the steering screw 3 is provided with a first external thread 31, the first external thread 31 extends along the axial direction of the steering screw 3, the inner peripheral wall of the steering nut 22 is provided with an internal thread, and the internal thread is meshed with the first external thread 31. The first external thread 31 and the internal thread are both trapezoidal threads, and have a good self-locking function.

Example 4

With reference to fig. 1 to 3, the rear wheel steering actuator of the present embodiment can be improved as follows, compared with any of the embodiments 1 to 3: the ball seat driving device further comprises a shell 5, the driving piece 1 is installed on the shell 5, the transmission gear 21, the steering nut 22 and a part of the steering screw rod 3 are arranged inside the shell 5, and the shell 5 is movably abutted to the ball seat 4. When the steering screw rod 3 axially moves to the left for a certain distance, the ball seat 4 positioned at the right side of the steering screw rod 3 and the end part of the shell 5 are abutted against each other so as to limit the stroke of the steering screw rod 3 axially moving to the left; when the steering screw 3 moves to the right in the axial direction by a certain distance, the ball seat 4 located on the left of the steering screw 3 and the other end of the housing 5 abut against each other to define the stroke of the steering screw 3 moving axially to the right.

Example 5

With reference to fig. 1 to 3, the rear wheel steering actuator of the present embodiment can be improved as follows, compared with any of embodiments 1 to 4: the ball cup 4 includes a first connecting portion 41 and a second connecting portion 42, the first connecting portion 41 is connected to the steering screw 3, and the second connecting portion 42 is used for connecting a tie rod.

Example 6

With reference to fig. 1 to 3, the rear wheel steering actuator of the present embodiment can be improved as follows, compared with any of embodiments 1 to 5: the end of the steering screw rod 3 is provided with a screw hole along the axial direction, the first connecting part 41 is provided with a through hole for the bolt 6 to pass through along the axial direction, and the first connecting part 41 is connected with the steering screw rod 3 through the bolt 6. Both ends of the steering screw 3 are provided with screw holes, the number of the ball seats 4 is two, and the ball seats 4 are mounted at the end portions of the steering screw 3 through bolts 6. The steering screw does not interfere with other connecting components. The housing 5 may be provided with bearings on its inner circumferential wall against which the steering screw 3 is turned, the other parts being herein referred to in addition to the ball socket 4, the bolt 6, the steering nut 22 and the bearings.

Example 7

With reference to fig. 1 to 3, the rear wheel steering actuator of the present embodiment can be improved as follows, compared with any of embodiments 1 to 6: the first connecting portion 41 is provided with a screw hole, the outer peripheral wall of the end portion of the steering screw rod 3 is provided with a second external thread 32, the second external thread 32 extends along the axial direction of the steering screw rod 3, the second external thread 32 is not connected with the first external thread 31, and the end portion of the steering screw rod 3 penetrates through the screw hole and is matched with the nut 9. The outer peripheral wall of the steering screw rod 3 is provided with a second external thread 32, the axial moving length of the steering screw rod 3 can be selected according to the vehicle installation environment, and the steering screw rod 3 is locked and fixed by a nut 9, so that the flexible change of the length of the steering screw rod 3 is realized. The portion of the steering screw 3 that protrudes out of the screw hole does not interfere with other connecting parts, here the parts other than the ball cup 4, the bolt 6, the steering nut 22 and the bearing.

Example 8

With reference to fig. 1 to 3, the motor vehicle of the present embodiment includes a rear wheel, a tie rod, and the rear wheel steering actuator according to any one of technical solutions of embodiments 1 to 7, where the tie rod is connected to a ball cup 4, and the rear wheel is connected to the tie rod.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a rear wheel steering actuator, its characterized in that includes driving piece, drive assembly, steering screw and bulb seat, the driving piece is connected with drive assembly, the coaxial cover of drive assembly is established in steering screw's periphery, when the driving piece drive turns to drive assembly and rotates, turns to the subassembly and drives steering screw axial displacement, the bulb seat sets up the both ends at steering screw, the bulb seat is used for connecting the tie rod that turns to.

2. The rear wheel steering actuator according to claim 1, wherein the transmission assembly includes a transmission gear and a steering nut, the driving member drives the transmission gear to rotate, the transmission gear is coaxially disposed on an outer circumference of the steering nut, and the steering nut is coaxially disposed on an outer circumference of the steering screw.

3. The rear wheel steering actuator according to claim 2, wherein the steering screw outer peripheral wall is provided with a first external thread extending in the steering screw axial direction, and the steering nut inner peripheral wall has an internal thread that meshes with the first external thread.

4. The rear wheel steering actuator according to claim 2, further comprising a housing, the driving member being mounted on the housing, the transmission gear, the steering nut and a portion of the steering screw being disposed within the housing, the housing being movably abutted against the ball cup.

5. The rear wheel steering actuator according to claim 1, wherein the ball cup includes a first connecting portion connected to the steering screw, and a second connecting portion for connecting a tie rod.

6. The rear wheel steering actuator according to claim 5, wherein the steering screw end portion is provided with a screw hole in the axial direction, the first connecting portion is provided with a through hole in the axial direction through which a bolt passes, and the first connecting portion and the steering screw are connected by the bolt.

7. The rear wheel steering actuator according to claim 5, wherein the first connecting portion has a threaded hole, an outer peripheral wall of an end portion of the steering screw is provided with a second external thread extending in an axial direction of the steering screw, the second external thread being disconnected from the first external thread, and the end portion of the steering screw passes through the threaded hole and engages with the nut.

8. A motor vehicle comprising rear wheels, a tie rod connected to a ball cup, and the rear wheel steering actuator of any one of claims 1 to 7, wherein the rear wheels are connected to the tie rod.