WO2023103644A1

WO2023103644A1 - Steering gear assembly and steering system

Info

Publication number: WO2023103644A1
Application number: PCT/CN2022/128409
Authority: WO
Inventors: 施国标; 孙惠春; 韩冲; 刘鑫旺; 曹景昭; 王军; 王文伟
Original assignee: 北京理工大学深圳汽车研究院(电动车辆国家工程实验室深圳研究院)
Priority date: 2021-12-10
Filing date: 2022-10-28
Publication date: 2023-06-15
Also published as: CN113895510A; CN113895510B

Abstract

A steering gear assembly and a steering system. The steering gear assembly comprises: a first rack (10), a second rack (20), a transmission shaft (30), a first gear (40), a second gear (50), a reversing gear set (60) and a rotary driving assembly (70), wherein the first gear (40) is fixed on the transmission shaft (30), and meshes with the first rack (10); the second gear (50) and the reversing gear set (60) are both slidably mounted on the transmission shaft (30), so as to slide to separately mesh with the second rack (20); the rotary driving assembly (70) is drivingly connected to the transmission shaft (30), and is used for driving the transmission shaft (30) to rotate around a shaft axis of the transmission shaft (30); the reversing gear set (60) is used for outputting torque in an opposite direction of the transmission shaft (30); when the second rack (20) meshes with the reversing gear set (60), the first rack (10) and the second rack (20) translate in the same direction or translate in opposite directions; and when the second rack (20) meshes with the second gear (50), the first rack (10) and the second rack (20) translate in opposite directions or translate in the same direction. The steering gear assembly can achieve the rotation of steering wheels in the same direction and opposite directions, thereby achieving the functions of a vehicle steering in situ and traveling laterally, and improving the maneuverability of the vehicle.

Description

Steering gear assembly and steering system

technical field

The invention relates to the technical field of steering gear, in particular to a steering gear assembly and a steering system.

Background technique

Automobile steering system is one of the core systems of the automobile chassis. The performance of the steering system directly affects the handling stability of the car. The development of the steering-by-wire system has greatly improved the steering stability of the car. It cancels the steering wheel and The mechanical connection between the steering gears completely gets rid of the inherent limitations of the traditional steering system and improves the safety of the car.

The existing steering-by-wire technology has gradually matured and has been applied to various types of vehicles. For the overall steering-by-wire system with a mechanical connection between the left and right steering wheels, the left and right steering wheels can only rotate in the same direction. , and functions such as in-situ steering and lateral driving cannot be realized, resulting in poor maneuverability of the vehicle.

technical problem

The technical problem mainly solved by the present invention is to provide a function that can realize the same direction rotation and reverse rotation of the steering wheel, so that the vehicle can turn on the spot and run sideways, and improve the maneuverability of the vehicle.

technical solution

According to the first aspect, the present application provides a steering gear assembly, including: a first rack, a second rack, a transmission shaft, a first gear, a second gear, a reversing gear set, and a rotating drive assembly; The first gear is fixed on the transmission shaft and meshes with the first rack; the second gear and the reversing gear set can be slidably installed on the transmission shaft to slide to the respective meshed with the second rack; the rotary drive assembly is connected to the transmission shaft for driving the transmission shaft to rotate around its axis; the reversing gear set is used for outputting in the opposite direction to the transmission shaft torque; when the second rack meshes with the reversing gear set, the first rack and the second rack translate in the same direction or translate in the opposite direction; when the second rack and the When the second gear meshes, the first rack and the second rack translate in opposite directions or translate in the same direction.

In one embodiment, it further includes: a backup rotation drive assembly, the backup drive assembly is in transmission connection with the reversing gear set, and is used to drive the transmission shaft to rotate around its axis through the reversing gear set.

In one embodiment, it further includes: a slip drive assembly, the slip drive assembly is connected between the second gear and the reversing gear set, and is used to drive the second gear and the reversing gear set. The gear sets move to mesh with the second racks respectively.

In one embodiment, the reversing gear set includes: a first driven gear, a second driven gear, and a driving gear; the first driven gear is slidably mounted on the transmission shaft, and the The second driven gear and the driving gear can slide with the sliding of the first driven gear; the second driven gear meshes with the first driven gear, and the driving gear meshes with the second driven gear. The gear is meshed, and the spare drive assembly is in transmission connection with the driving gear; when the second rack meshes with the reversing gear set, the second rack meshes with the driving gear; the sliding The transfer drive assembly is connected between the second gear and the first driven gear.

In one embodiment, the circumferential edge of the first driven gear is provided with an annular extension wall, and the inner ring of the annular extension wall is formed with an annular ring gear, and the second driven gear and the annular The ring gear meshes.

In one embodiment, the linear speed of the first gear is the same as that of the driving gear.

In one embodiment, the sliding drive assembly includes: a linear drive unit and a shift fork, the linear drive unit is used to drive the shift fork to reciprocate along the length direction parallel to the transmission shaft, and the fork of the shift fork At least one first bearing is arranged on one side of the arm, at least one second bearing is arranged on the other side of the fork arm of the shift fork, and a first annular protrusion is arranged on the side of the second gear facing the shift fork, The side of the first driven gear facing the shift fork is provided with a second annular protrusion, the side of the first annular protrusion is provided with a first annular slot, and the side of the second annular protrusion is provided with In the second annular locking groove, the first bearing is rotatably installed in the first annular locking groove, and the second bearing is rotatably installed in the second annular locking groove.

In one embodiment, the linear drive unit includes: a linear drive motor and a lead screw pair, the linear drive motor is connected to the lead screw of the lead screw pair for driving the lead screw of the lead screw pair to wind Its axis rotates, and the shift fork is fixedly connected with the nut of the screw pair.

In one embodiment, the pitch circle diameters of the first gear and the second gear are the same.

According to the second aspect of the present application, the present application provides a steering system, including: the steering gear assembly.

Beneficial effect

According to the steering gear assembly and the steering system of the above-mentioned embodiment, the reversing gear set and the second gear mesh with the second rack respectively, so that the first rack and the second rack can translate in the same direction or reverse Translate, and then drive the two steering wheels to realize the same direction rotation and reverse rotation. In the reverse rotation state, the vehicle can realize the functions of steering in situ and lateral driving, and improve the mobility of the vehicle.

Description of drawings

Fig. 1 is the perspective view of the steering gear assembly provided by the present application;

Fig. 2 is the exploded view of the steering gear assembly provided by the present application;

Fig. 3 is a structural schematic diagram of the slip drive assembly in the steering gear assembly provided by the present application;

Fig. 4 is a schematic diagram 1 of the second rack meshing with the reversing gear set in the steering gear assembly provided by the present application;

Fig. 5 is a schematic diagram 2 of the second rack meshing reversing gear set in the steering gear assembly provided by the present application;

Fig. 6 is a schematic diagram 1 of the second rack meshing with the second gear in the steering gear assembly provided by the present application;

Fig. 7 is a schematic diagram 2 of the second rack meshing with the second gear in the steering gear assembly provided by the present application;

Fig. 8 is the front view of the reversing gear set in the steering gear assembly provided by the present application;

Fig. 9 is a sectional view of the reversing gear set in the steering gear assembly provided by the present application;

Figure 10 is a perspective view of the steering system provided by the present application;

Fig. 11 is an exploded view of the steering system provided by the present application.

Embodiments of the present invention

The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. Wherein, similar elements in different implementations adopt associated similar element numbers. In the following implementation manners, many details are described for better understanding of the present application. However, those skilled in the art can readily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the application are not shown or described in the description, this is to avoid the core part of the application being overwhelmed by too many descriptions, and for those skilled in the art, it is necessary to describe these operations in detail Relevant operations are not necessary, and they can fully understand the relevant operations according to the description in the specification and general technical knowledge in the field.

In addition, the characteristics, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be exchanged or adjusted in a manner obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment, and do not mean a necessary sequence, unless otherwise stated that a certain sequence must be followed.

The serial numbers assigned to components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "connection" mentioned in this application include direct and indirect connection (connection) unless otherwise specified.

The application provides a steering gear assembly and a steering system, wherein the steering gear assembly can not only realize the same direction rotation of the left steering wheel and the right steering wheel of the vehicle, but also realize the reverse rotation of the left steering wheel and the right steering wheel of the vehicle. The left steering wheel and the right steering wheel that rotate in the opposite direction are in the form of "inner eight" or "outer eight", which can realize the functions of vehicle turning in situ and lateral driving, and improve the mobility of the vehicle.

In the present application, the steering system is installed on the chassis of the vehicle, together with the vehicle frame, the vehicle body, wheels installed on the chassis, a brake system, etc., to form a vehicle.

Embodiment one,

Referring to Fig. 1 and Fig. 2, the steering gear assembly provided by this embodiment includes: a first rack 10, a second rack 20, a transmission shaft 30, a first gear 40, a second gear 50, and a reversing gear group 60, and a rotary drive assembly 70. The first gear 40 is fixed on the transmission shaft 30 , and the first rack 20 meshes with the first gear 40 . Both the second gear 50 and the reversing gear set 60 can be slidably installed on the transmission shaft 30, and the second gear 50 and the reversing gear set 60 can slide along the length direction of the transmission shaft 30 to the second gear respectively. The strip 20 is engaged. In other words, there is a rack and pinion engagement position on the transmission shaft 30, and the second gear 50 can slide to the rack and pinion engagement position to mesh with the second rack and rack 20. At this time, the reversing gear set 60 is disengaged from the rack and pinion engagement position, but not disengaged from the transmission shaft 30; similarly, the reversing gear set 60 can also slide to the rack and pinion engagement position to engage with the second rack and rack 20, at this time, the second gear 50 is disengaged from the rack and pinion engagement bit, but not disengaged from drive shaft 30. The rotary drive assembly 70 is in transmission connection with the transmission shaft 30 , the rotary drive assembly 70 is used to drive the transmission shaft 30 to rotate around its axis, and the reversing gear set 60 is used to output torque in the opposite direction to the transmission shaft 30 .

In this embodiment, the first gear 40 can be fixed on the transmission shaft 30 by positioning both ends of the gear in the axial direction on the transmission shaft 30 , and the position of the first gear 40 remains fixed all the time.

During the process of driving the transmission shaft 30 to rotate around its axis by the rotary drive assembly 70, the first gear 40, the second gear 50, and the reversing gear set 60 can rotate with the rotation of the transmission shaft 30. It should be noted that, When the reversing gear set 60 meshes with the second rack 20 , the first gear 40 can output the torque in the same direction as the transmission shaft 30 , and the reversing gear set 60 can output the torque in the opposite direction to the transmission shaft 30 . When the second gear 50 meshes with the second rack 20 , both the second gear 50 and the first gear 40 can output torque in the same direction as the transmission shaft 30 .

In this embodiment, when the second rack 20 meshes with the reversing gear set 60, the first rack 10 and the second rack 20 translate in the same direction or translate in opposite directions; When the gears 50 are engaged, the first rack 10 and the second rack 20 translate in opposite directions or translate in the same direction. The following embodiments describe in detail the translation directions of the first rack 10 and the second rack 20 .

In this embodiment, the first rack 10 and the second rack 20 are parallel to each other, and the length directions of both are horizontal. 4, when the first rack 10 meshes with the first gear 40 and the second rack 20 meshes with the reversing gear set 60, the first rack 10 can mesh under the first gear 40, and the second rack 20 can be meshed above the reversing gear set 60, or the first rack 10 can be meshed above the first gear 40, and the second rack 20 can be meshed below the reversing gear set 60, so that the first rack 10 and the second rack 20 are set up and down, so that when the second rack 20 meshes with the reversing gear set 60, the first rack 10 and the second rack 20 can translate in the same direction.

Continue referring to FIG. 4, which shows that the first rack 10 is engaged below the first gear 40, and the second rack 20 is engaged above the reversing gear set 60, that is, the first rack 10 and the second rack One of the states where the two racks 20 are arranged up and down, and the straight line with the arrow in FIG. 4 only indicates the translation direction of the first rack 10 and the second rack 20 in this state. When the transmission shaft 30 rotates clockwise around its axis under the drive of the rotary drive assembly 70, the first gear 40 outputs a clockwise rotation, driving the first rack 10 to move to the left, and the reversing gear set 60 It can output counterclockwise rotation, which also drives the second rack 20 to move to the left; The clockwise rotation drives the first rack to move to the right, and the reversing gear set 60 can output clockwise rotation to drive the second rack 20 to move to the right. In this way, when the second rack 20 is engaged with the reversing gear set 60 , the first rack 10 and the second rack 20 can translate in the same direction.

5, when the first rack 10 meshes with the first gear 40 and the second rack 20 meshes with the reversing gear set 60, the first rack 10 can mesh under the first gear 40, and the second rack 20 can mesh with the first gear 40. 20 can also be meshed below the reversing gear set 60, or the first rack 10 can be meshed above the first gear 40, and the second rack 20 can be meshed above the reversing gear set 60, so that the first tooth The rack 10 and the second rack 20 are arranged above or below at the same time, so that when the second rack 20 meshes with the reversing gear set 60 , the first rack 10 and the second rack 20 can translate in opposite directions.

Continue referring to FIG. 5, which shows that the first rack 10 is engaged under the first gear 40, and the second rack 20 is engaged under the reversing gear set 60, that is, the first rack 10 and the second gear The two racks 20 are simultaneously placed below, and the straight line with the arrow in FIG. 5 only indicates the translation direction of the first rack 10 and the second rack 20 in this state. When the transmission shaft 30 rotates clockwise around its axis under the drive of the rotary drive assembly 70, the first gear 40 outputs a clockwise rotation, driving the first rack 10 to move to the left, and the reversing gear set 60 It can output counterclockwise rotation, driving the second rack 20 to move to the right; when the transmission shaft 30 rotates counterclockwise around its axis under the drive of the rotation drive assembly 70, the first gear 40 outputs counterclockwise The rotational movement in the direction drives the first rack 10 to move to the right, and the reversing gear set 60 can output a rotational movement in the clockwise direction to drive the second rack 20 to move to the left. In this way, when the second rack 20 is engaged with the reversing gear set 60 , the first rack 10 and the second rack 20 can translate in opposite directions.

In this embodiment, as shown in FIG. 6 , when the first rack 10 engages with the first gear 40 and the second rack 20 engages with the second gear 50 , the first rack 10 can engage under the first gear 40 , The second rack 20 can be meshed above the second gear 50, or the first rack 10 can be meshed above the first gear 40, and the second rack 20 can be meshed below the second gear 50, so that the first The rack 10 and the second rack 20 are arranged up and down, so that when the second rack 20 meshes with the second gear 50 , the first rack 10 and the second rack 20 translate in opposite directions.

Continuing to refer to Fig. 6, Fig. 6 shows that the first rack 10 is meshed below the first gear 40, and the second rack 20 is meshed above the second gear 50, that is, the first rack 10 and the second One of the states where the rack 20 is set up and down, and the straight line with the arrow in FIG. 6 only indicates the translation direction of the first rack 10 and the second rack 20 in this state. When the transmission shaft 30 rotates clockwise around its axis under the drive of the rotary drive assembly 70, both the first gear 40 and the second gear 50 can output clockwise rotation, and the first gear 40 drives the second gear. One rack 10 moves to the right, and the second gear 20 drives the second rack 20 to move to the left; Both the first gear 40 and the second gear 50 can output the rotation motion in the counterclockwise direction, the first gear 40 drives the first rack 10 to move to the left, and the second gear 20 drives the second rack 20 to move to the right. In this way, when the second rack 20 is engaged with the second gear 50, the first rack 10 and the second rack 20 translate in opposite directions.

7, when the first rack 10 engages the first gear 40 and the second rack 20 engages the second gear 50, the first rack 10 can engage under the first gear 40, and the second rack 20 It can also be engaged below the second gear 50, or the first rack 10 can be engaged above the first gear 40, and the second rack 20 can be engaged above the second gear 50, so that the first rack 10 and The second rack 20 is disposed above or below at the same time, so that when the second rack 20 meshes with the second gear 50 , the first rack 10 and the second rack 20 can translate in the same direction.

Continuing to refer to Fig. 7, Fig. 7 shows that the first rack 10 is meshed under the first gear 40, and the second rack 20 is meshed under the second gear 50, that is, the first rack 10 and the second The rack 20 is set in the lower state at the same time, and the straight line with the arrow in FIG. 5 only indicates the translation direction of the first rack 10 and the second rack 20 in this state. When the transmission shaft 30 rotates clockwise around its axis under the drive of the rotary drive assembly 70, the first gear 40 outputs clockwise rotation, driving the first rack 10 to move leftward, and the second gear 50 can The output clockwise rotation motion drives the second rack 20 to move to the left; when the transmission shaft 30 rotates counterclockwise around its axis under the drive of the rotation drive assembly 70, the first gear 40 outputs the counterclockwise rotation. The rotational movement of the first gear rack 10 is driven to move to the right, and the second gear 50 can output a counterclockwise rotational movement to drive the second rack gear 20 to move to the right. In this way, when the second rack 20 is engaged with the second gear 50 , the first rack 10 and the second rack 20 can translate in the same direction.

As shown in Figure 10 and Figure 11, what Figure 10 and Figure 11 show is the state that the first rack 10 and the second rack 20 are set up and down, and the first rack 10 is meshed under the first gear 40 , the state where the second rack 20 is meshed above the reversing gear set 60 . The steering gear assembly is installed in the steering system, the first rack 10 is connected with one end of the first tie rod 101 through a ball joint pair, and the second rack 10 is connected with one end of the second tie rod 102 through a ball joint pair, The other end of the first tie rod 101 is connected to the first steering knuckle 201 through a ball joint, the other end of the second tie rod 102 is connected to the second steering knuckle 202 through a ball joint, and the first steering wheel 301 is installed on the first steering knuckle. On the knuckle 201, the second steering wheel 302 is installed on the second steering knuckle 202.

When the transmission shaft 30 rotates clockwise around its axis under the drive of the rotary drive assembly 70, the first gear 40 outputs a clockwise rotation, driving the first rack 10 to move to the left, and the first rack 10 The first steering knuckle 201 is pushed by the first tie rod 101 to make the first steering wheel 301 turn to the right. At this time, the reversing gear set 60 can output a counterclockwise rotation motion, which also drives the second rack 20 to Moving to the left, the second rack 20 pulls the second steering knuckle 202 through the second tie rod 102 to make the second steering wheel 302 turn rightward. When the transmission shaft 30 rotates counterclockwise around its axis under the drive of the rotary drive assembly 70, the first gear 40 outputs a counterclockwise rotational movement, driving the first rack 10 to move to the right, and the first rack 10 10 Pull the first steering knuckle 201 through the first tie rod 101 to make the first steering wheel 301 turn to the left. At this time, the reversing gear set 60 can output clockwise rotation, driving the second rack Moving to the right, the second rack 20 pulls the second steering knuckle 202 through the second tie rod 102 to make the second steering wheel 302 turn left. In this way, the first steerable wheel 301 and the second steerable wheel 302 are turned in the same direction to realize the same direction steering function of the vehicle.

Similarly, when the method shown in FIG. 7 is adopted, the first rack 10 is engaged above the first gear 40, the second rack 20 is engaged above the second gear 50, or the first rack 10 is engaged with the first gear. Below the gear 40, the second rack 20 meshes with the lower side of the second gear 50, so that the first rack 10 and the second rack 20 are set at the top or bottom at the same time, and the first rack 10 and the second rack can also be arranged The rack 20 translates in the same direction, so that the first steering wheel 301 and the second steering wheel 302 rotate in the same direction to realize the same direction steering function of the vehicle.

As shown in FIG. 5, when the second rack 20 is switched to mesh with the reversing gear set 60, the first rack 10 can be engaged under the first gear 40, and the second rack 20 can also be engaged with the reversing gear set. 60, or the first rack 10 can be meshed above the first gear 40, and the second rack 20 can be meshed above the reversing gear set 60, so that the first rack 10 and the second rack 20 can simultaneously When the drive shaft 30 is driven by the rotating drive assembly 70 and rotates clockwise around its axis, the first gear 40 will rotate clockwise to drive the first rack 10. Moving to the left, the first rack 10 pushes the first steering knuckle 201 through the first tie rod 101, so that the first steering wheel 301 turns to the right. At this time, the reversing gear set 60 can output counterclockwise rotation , drives the second rack 20 to move to the right, and the second rack 20 pulls the second steering knuckle 202 through the second tie rod 102 to make the second steering wheel 302 turn left; when the transmission shaft 30 is rotating the driving assembly 70 When the drive rotates counterclockwise around its axis, the first gear 40 outputs a counterclockwise rotational movement, driving the first rack 10 to move to the right, and the first rack 10 pulls the first rack 10 through the first tie rod 101. A steering knuckle 201, so that the first steering wheel 301 rotates to the left, at this time, the reversing gear set 60 can output a clockwise rotation motion, driving the second rack 20 to move to the left, and the second rack 20 passes through The second tie rod 102 pulls the second steering knuckle 202 to turn the second steering wheel 302 to the right. In this way, the first steering wheel 301 and the second steering wheel 302 can turn in opposite directions, so as to realize the functions of spot steering and lateral driving, and improve the maneuverability of the vehicle.

Similarly, as shown in FIG. 6, when the first rack 10 meshes with the first gear 40 and the second rack 20 meshes with the second gear 50, the first rack 10 can mesh under the first gear 40, and the second rack 20 can mesh with the second gear 50. The rack 20 can be engaged above the second gear 50, or the first rack 10 can be engaged above the first gear 40, and the second rack 20 can be engaged below the second gear 50, so that the first rack 10 and the second rack 20 are arranged up and down, which can also make the first rack 10 and the second rack 20 translate in opposite directions, so as to realize the functions of turning in situ and lateral driving of the vehicle.

In this application, the first steerable wheels 301 and the second steerable wheels 302 may be two front wheels of the vehicle, or two rear wheels of the vehicle, which are set according to actual conditions.

In the present embodiment, the magnitude of the torque for driving the transmission shaft 30 to rotate by the rotary drive assembly 70 is that the driver applies a steering torque to the steering wheel (steering wheel), and the torque is input to the steering shaft through the steering shaft, the steering universal joint and the steering transmission shaft. Specifically, the controller converts the steering torque into an electrical signal, and sends the electrical signal to the rotary drive assembly 70 to control the magnitude of the torque output by the rotary drive assembly 70 . If the rotary drive assembly 70 is unusable due to failure or other reasons, the driver needs to apply more force to the steering wheel, or the steering cannot be completed. Continuing to refer to Fig. 1 and Fig. 2, the steering gear assembly provided by this embodiment also includes: a backup rotary drive assembly 80, which is in transmission connection with the reversing gear set 60, and is used to pass the reversing gear The group 60 drives the transmission shaft 30 to rotate around its axis.

In this embodiment, for a vehicle, the first steering wheel 301 and the second steering wheel 302 often need to rotate in the same direction to make the vehicle turn. In this way, the spare rotation drive assembly 80 is connected to the reversing gear set 60 in transmission.

Of course, in some embodiments, the spare rotation drive assembly 80 can also be connected with the transmission shaft 30, so that it can be applied to the first steering wheel 301 and the second steering wheel 302 to rotate in the same direction, and can also be applied to the first steering wheel. The wheel 301 and the second steering wheel 302 rotate in opposite directions.

In this embodiment, both the rotary drive assembly 70 and the backup rotary drive assembly 80 adopt a drive motor and a reducer.

Referring to FIG. 3 , the steering gear assembly provided in this embodiment further includes: a slip drive assembly 90 connected between the second gear 50 and the reversing gear set 60 for driving the first The second gear 50 and the reversing gear set 60 move to mesh with the second rack 20 respectively.

Referring to FIG. 8 and FIG. 9 , the reversing gear set 60 includes: a first driven gear 61 , a second driven gear 62 , and a driving gear 63 . The first driven gear 61 is slidably mounted on the transmission shaft 30 , and both the second driven gear 62 and the driving gear 63 can slide along with the sliding of the first driven gear 61 . The second driven gear 62 meshes with the first driven gear 61, the driving gear 63 meshes with the second driven gear 62, and the aforementioned backup drive assembly 80 is in transmission connection with the driving gear 63, and the aforementioned slip drive assembly 90 is connected Between the second gear 50 and the first driven gear 61 . When the second rack 20 is engaged with the reversing gear set 60 , the second rack 20 is engaged with the driving gear 63 .

It can be understood that when the transmission shaft 30 is driven by the rotary drive assembly 70 to rotate clockwise around its own axis, the first driven gear 61 rotates clockwise, and under the action of the first driven gear 61 , the second driven gear 62 rotates clockwise, and under the action of the second driven gear 62 , the driving gear 63 rotates counterclockwise. Similarly, when the transmission shaft 30 is driven by the rotary drive assembly 70 to rotate counterclockwise around its own axis, the first driven gear 61 rotates counterclockwise, and under the action of the first driven gear 61, the first driven gear 61 The second driven gear 62 rotates counterclockwise, and under the action of the second driven gear 62 , the driving gear 63 rotates clockwise. In this way, the reversing gear set 60 outputs torque in the opposite direction to that of the transmission shaft 30 .

In one embodiment, an annular extension wall 611 is provided on the peripheral edge of the first driven gear 61, and an annular ring gear 612 is formed on the inner ring of the annular extension wall 611, and the second driven gear 62 and the annular The meshing of the ring gear 612 can effectively save the installation space of the reversing gear set 60 .

In this embodiment, the linear velocity of the first gear 40 and the driving gear 63 are the same, so that the translation speeds of the first rack 10 and the second rack 20 are the same, that is, the first rack 10 and the second rack 20 Translating the same distance ensures that the steering angles of the first steering wheel 301 and the second steering wheel 302 are the same when they rotate in the same direction.

Similarly, in one embodiment, the pitch circle diameters of the first gear 40 and the second gear 50 are the same, so that the first gear 40 and the second gear 50 have the same linear velocity, and the first rack 10 can also be Translating the same distance as the second rack 20 ensures that the steering angles of the first steering wheel 301 and the second steering wheel 302 are the same when they rotate in the same direction.

Continue referring to FIG. 3 , the sliding drive assembly 90 includes: a linear drive unit 91 and a shift fork 92, the linear drive unit 91 is used to drive the shift fork 92 to reciprocate along the length direction parallel to the transmission shaft 30, and the linear drive unit 91 drives The shift fork 92 moves back and forth along the length direction parallel to the transmission shaft 30, so that the second gear 50 can slide along the length direction of the transmission shaft 30 to the rack and pinion engagement position on the transmission shaft 30 through the shift fork 92, and make the second gear 50 The gear 50 is meshed with the second rack 20, or the reversing gear set 60 is slid along the length direction of the transmission shaft 30 to the rack and pinion meshing position of the transmission shaft 30 through the shift fork 92, and the reversing gear set 60 and the The second rack gear 20 is engaged.

In this embodiment, at least one first bearing is arranged on one side of the fork arm of the shift fork 92, at least one second bearing is arranged on the other side of the fork arm of the shift fork 92, and the second gear 50 faces toward the shift fork 92. The side of the first annular protrusion is provided with a first annular protrusion, and the side of the first driven gear 61 facing the shift fork 92 is provided with a second annular protrusion. The raised side is provided with a second annular locking groove, the first bearing is rotatably installed in the first annular locking groove, and the second bearing is rotatably installed in the second annular locking groove. In this embodiment, both the first annular locking groove and the second annular locking groove are coaxial with the transmission shaft 30. After the second gear 50 is slid to mesh with the second rack 20 through the shift fork 92, the first bearing On the premise of being rotatably installed in the first annular slot, it can ensure that the shift fork 92 does not affect the rotation of the second gear 50 . After the reversing gear set 60 is slid through the shift fork 92 to make the driving gear 63 mesh with the second rack 20, under the premise that the second bearing is rotatably installed in the second annular slot, the shift fork 92 can be guaranteed The rotation of the first driven gear 61 is not affected.

In one embodiment, the linear drive unit 91 includes: a linear drive motor 911 and a lead screw pair 912, the linear drive motor 911 is connected to the lead screw of the lead screw pair 912 for driving the lead screw of the lead screw pair 912 around its axis The center line rotates, and the shift fork 91 is fixedly connected with the nut of the lead screw pair 912, and the nut of the lead screw pair 912 converts the rotational motion of the lead screw into a linear motion along the length direction of the lead screw. In a preferred embodiment, the length direction of the lead screw of the lead screw pair 912 is parallel to the length direction of the transmission shaft 30 .

In this embodiment, the torque output by the linear drive motor 911 can be controlled by the controller, and the direction and length of the nut of the screw pair 912 moving along the length direction of the screw can be controlled, so that the second gear 50 and the reversing gear set 60 slide to mesh with the second racks 20 respectively.

Embodiment two,

Referring to Fig. 10 and Fig. 11, this embodiment provides a steering system, which includes: the steering gear assembly in Embodiment 1. It also includes: a first tie rod 101 and a second tie rod 102 , the first rack 10 is meshed below the first gear 40 , and the second rack 20 is meshed above the reversing gear set 60 . The steering gear assembly is installed in the steering system, the first rack 10 is connected with one end of the first tie rod 101 through a ball joint pair, and the second rack 10 is connected with one end of the second tie rod 102 through a ball joint pair, The other end of the first tie rod 101 is connected to the first steering knuckle 201 through a ball joint, the other end of the second tie rod 102 is connected to the second steering knuckle 202 through a ball joint, and the first steering wheel 301 is installed on the first steering knuckle. On the knuckle 201, the second steering wheel 302 is installed on the second steering knuckle 202.

In this embodiment, the first wheel 301 and the second wheel 301 can be rotated in the same direction through the steering gear assembly, and the reverse rotation of the first wheel 301 and the second wheel 302 can also be realized, so that the vehicle can turn on the spot And lateral driving, improve vehicle maneuverability.

To sum up, in the steering gear assembly and the steering system provided by the present application, the reversing gear set and the second gear are respectively meshed with the second rack, so that the first rack and the second rack can be in the same direction Translational translation can also be reverse translation, and then drive the two steering wheels to realize the same direction rotation and reverse rotation. In the reverse rotation state, the vehicle can realize the function of steering in situ and lateral driving, and improve the mobility of the vehicle.

The above uses specific examples to illustrate the present invention, which is only used to help understand the present invention, and is not intended to limit the present invention. For those skilled in the technical field to which the present invention belongs, some simple deduction, deformation or replacement can also be made according to the idea of the present invention.

Claims

A steering gear assembly, characterized in that it includes: a first rack, a second rack, a transmission shaft, a first gear, a second gear, a reversing gear set, and a rotating drive assembly; the first gear is fixed On the transmission shaft, it meshes with the first rack; the second gear and the reversing gear set can be slidably installed on the transmission shaft to slide to the second gear respectively. The gear rack is engaged; the rotary drive assembly is connected to the transmission shaft for driving the transmission shaft to rotate around its axis; the reversing gear set is used to output the torque in the opposite direction to the transmission shaft; When the second rack meshes with the reversing gear set, the first rack and the second rack translate in the same direction or translate in the opposite direction; when the second rack and the second gear When engaged, the first rack and the second rack translate in opposite directions or translate in the same direction.
such as rights Require 1 The steering gear assembly is characterized in that it also includes: a backup rotation drive assembly, the backup rotation drive assembly is in transmission connection with the reversing gear set, and is used to drive the drive shaft through the reversing gear set rotate around its axis.
such as rights Require 2 The steering gear assembly is characterized in that it further includes: a slip drive assembly, the slip drive assembly is connected between the second gear and the reversing gear set, and is used to drive the second The gear and the reversing gear set move to mesh with the second rack respectively.
such as rights Require 3 The steering gear assembly is characterized in that the reversing gear set includes: a first driven gear, a second driven gear, and a driving gear; the first driven gear is slidably mounted on the On the transmission shaft, the second driven gear and the driving gear can slide along with the sliding of the first driven gear; the second driven gear meshes with the first driven gear, and the driving gear and The second driven gear is meshed, and the standby drive assembly is in transmission connection with the driving gear; when the second rack is meshed with the reversing gear set, the second rack is connected to the driving gear gear meshing; the slip drive assembly is connected between the second gear and the first driven gear.
such as rights Require 4 The steering gear assembly is characterized in that an annular extension wall is provided on the peripheral edge of the first driven gear, and an annular ring gear is formed on the inner ring of the annular extension wall, and the second driven gear The moving gear meshes with the ring gear.
such as rights Require 4 The steering gear assembly is characterized in that the linear speed of the first gear is the same as that of the driving gear.
such as rights Require 3 The steering gear assembly is characterized in that the sliding drive assembly includes: a linear drive unit and a shift fork, the linear drive unit is used to drive the shift fork to reciprocate along the length direction parallel to the transmission shaft, One side of the fork arm of the shift fork is provided with at least one first bearing, the other side of the fork arm of the shift fork is provided with at least one second bearing, and the second gear is provided with a A first annular protrusion, a second annular protrusion is provided on the side of the first driven gear facing the shift fork, a first annular locking groove is provided on the side of the first annular protrusion, and the second annular A second annular locking groove is provided on the side of the protrusion, the first bearing is rotatably installed in the first annular locking groove, and the second bearing is rotatably installed in the second annular locking groove.
such as rights Require 7 The steering gear assembly is characterized in that the linear drive unit includes: a linear drive motor and a lead screw pair, the linear drive motor is connected to the lead screw of the lead screw pair for driving the lead screw The lead screw of the lever pair rotates around its axis, and the shift fork is fixedly connected with the nut of the lead screw pair.
such as rights Require 1 The steering gear assembly is characterized in that the pitch circle diameters of the first gear and the second gear are the same.
A steering system, characterized in that, comprising: as claimed in 1-9 The steering gear assembly described in any one.