CN-121990050-A - Large-angle steering mechanism and automobile steering chassis system

CN121990050ACN 121990050 ACN121990050 ACN 121990050ACN-121990050-A

Abstract

The invention discloses a large-angle steering mechanism and an automobile steering chassis system, wherein the large-angle steering mechanism is used for driving a steering frame connected to wheels to steer, two free ends of the steering frame are respectively hinged with a first driving assembly and a second driving assembly, each of the first driving assembly and the second driving assembly comprises a connecting rod and a pull rod which are mutually hinged, the connecting rod is respectively hinged with one free end of the steering frame, the first driving assembly and the second driving assembly are driven by the same driving source and realize linkage through an adaptive adjusting mechanism, and the stroke difference between the pull rods of the first driving assembly and the second driving assembly, which is generated along with the increase of the rotation angle of the steering frame, is eliminated when the axis angle of the steering frame is changed and the driving wheel end is steered. The scheme ensures the safety performance and stability of the steering of the wheels when realizing large-angle rotation of the wheels, has wide application range and can realize the switching of different steering modes.

Inventors

CHEN YUAN
HUANG WEI
GUO XIANGPENG

Assignees

苏州辕驰科技有限公司

Dates

Publication Date: 20260508
Application Date: 20241102

Claims (10)

1. The large-angle steering mechanism is used for driving a steering frame connected to wheels to steer, and two free ends of the steering frame are respectively hinged with a first driving assembly and a second driving assembly, and is characterized in that: the first driving assembly and the second driving assembly respectively comprise a connecting rod and a pull rod which are hinged with each other, the connecting rod is hinged with one free end of the reversing frame, the first driving assembly and the second driving assembly are driven by the same driving source and are linked through an adaptive adjusting mechanism, after the first driving assembly and the second driving assembly receive the torque output by the adaptive adjusting mechanism, the pull rods of the first driving assembly and the second driving assembly move in opposite directions at different speeds, so that displacement difference is formed between the first driving assembly and the second driving assembly in the moving direction, and stroke difference between the pull rods of the first driving assembly and the second driving assembly, which is generated along with the increase of the rotation angle of the reversing frame, is eliminated while the axis angle of the reversing frame is changed and the wheel end is driven to reverse.
2. The large angle steering mechanism as set forth in claim 1, wherein the self-adaptive adjusting mechanism comprises a housing, a pair of half gears, oppositely disposed differential planet pinions meshed between the two half gears, and gear shafts penetrating the two differential planet pinions are disposed in the housing, each half gear is connected with an output shaft, an output shaft of one half gear is connected with a pull rod of the first driving assembly, an output shaft of the other half gear is connected with a pull rod of the second driving assembly, an external gear is disposed on the periphery of the housing, and the external gear is driven by a driving source and drives the whole self-adaptive adjusting mechanism to revolve.
3. The large angle steering mechanism of claim 1, wherein the tie rods of the first and second drive assemblies are each provided with a rack, and the output shafts of the two side gears are gears meshed with the racks.
4. The large angle steering mechanism according to any one of claims 1 to 3, wherein the drive source is a motor that drives a worm shaft to rotate, and the worm shaft is meshed with the external gear.
5. The large-angle steering mechanism according to any one of claims 1-3, wherein the driving source is a steering wheel, the steering wheel is connected with the self-adaptive speed adjusting mechanism, and the self-adaptive speed adjusting mechanism is synchronously driven to output power and drive the two pull rods to move in a translational mode when the steering wheel rotates.
6. The large-angle steering mechanism of claim 1, wherein the first driving assembly or the second driving assembly is further provided with a limiting mechanism on the pull rod, the limiting mechanism comprises a limiting groove and a pin puller, the limiting groove is arranged on the pull rod, the pin puller comprises a limiting pin which can stretch up and down, the length direction of the limiting groove is parallel to the translation direction of the pull rod, in a first state, the limiting pin is inserted into the limiting groove and slides in the limiting groove along with the movement of the pull rod, and in a second state, the limiting pin is separated from the limiting groove.
7. The large angle steering mechanism as set forth in claim 1, wherein the tie rod and the connecting rod of the first drive assembly or the second drive assembly are connected by a ball joint, respectively.
8. An automobile steering chassis system is characterized by comprising the large-angle steering mechanism and a suspension wheel assembly, wherein the large-angle steering mechanism and the suspension wheel assembly are arranged on the inner side of wheels, and the large-angle steering mechanism drives the steering frame to steer at a large angle.
9. The automobile steering chassis system of claim 8, wherein two free ends of the reversing frame are respectively provided with a through hole for installing the connecting rod, and a hub positioning mechanism is also installed on the reversing frame, and the axis of the hub positioning mechanism is perpendicular to the plane where the axes of the two through holes are located.
10. The large-angle steering mechanism according to claim 8, wherein the first driving assembly and the second driving assembly each comprise a pull rod and connecting rods hinged to two ends of the pull rod, two connecting rods positioned at first ends of the two pull rods are hinged to one free end of the first reversing frame respectively in the first driving assembly and the second driving assembly, two connecting rods positioned at second ends of the two pull rods are hinged to one free end of the second reversing frame respectively, and the first reversing frame and the second reversing frame are connected with one wheel respectively.

Description

Large-angle steering mechanism and automobile steering chassis system Technical Field The invention relates to the field of automobiles, in particular to a large-angle steering mechanism and an automobile steering chassis system. Background Common steering devices such as a shaft-assisted electric steering column, a rack-and-pinion-type electric steering device and the like adopt a single rack and a pull rod to push wheels to rotate around a master pin, and the effective rack force for pushing the wheels to rotate is insufficient due to the geometric dimension in a large angle, so that the wheel rotation moment is insufficient, large-angle steering cannot be realized, meanwhile, the steering stability of the wheels is poor, the driving comfort level is reduced, the rigidity requirement on a steering system is increased, and the reliability is reduced. In order to solve the above problems, the patent of the invention with the grant publication number of CN103895697B provides a four-wheel independent steering chassis system of an electric automobile and a steering mechanism of the four-wheel independent steering chassis system, wherein the four-wheel independent steering chassis system comprises two steering tie rods, a steering power unit and two groups of transmission units, the steering tie rods are horizontally arranged, one ends of the steering tie rods close to wheels are hinged with a steering knuckle of a suspension wheel assembly, the steering power unit is provided with two stages of power output ends with the same speed ratio and opposite power output directions, and the power output ends of the two groups of transmission units are respectively connected with one ends of the two steering tie rods far away from the wheels to drive the steering tie rods to horizontally reciprocate so as to drive the wheels to swing. The steering mechanism has good steering stability of wheels, and the thrust torque and the tension torque jointly act on the wheels through the principle of reverse motion of the pull rod, so that the problem of insufficient wheel rotation moment is solved. However, the dual-pull-rod controlled steering mechanism still has some problems in practical application: Firstly, as shown in fig. 1, the two-pull rod mechanism pushes and pulls the two pull rods in opposite directions, so that the hinge point 1 and the hinge point 2 of the two pull rods and the wheel perform circular motion around the virtual steering main pin, at this time, because the hinge points of the two pull rods and the wheel are positioned on different sides of the main pin, when the two pull rods synchronously rotate around the circumference of the virtual steering main pin by the same radian, the movement angles of the two pull rods are different, the displacement distances of the two pull rods and the two pull rods in the respective translation directions are inconsistent, and particularly referring to fig. 1, when the wheel starts rotating from 0 ℃, one pull rod for pulling the wheel needs to move for a longer distance relative to one pull rod for pushing the wheel, so that a stroke difference is formed between the two pull rods, and when the rotation angle of the wheel is larger, the stroke difference between the two pull rods is also larger. In the above-mentioned reference, the speed ratio of the two tie rods is the same, so that when the wheel rotates, the reverse movement travel of the two tie rods is the same, at this time, the tie rod structure needs to overcome the overconstrained condition of the whole rigid link mechanism (including the output motor, the worm gear, the two sets of racks and gears, the two sets of tie rods, the wheel, etc.) when the wheel performs circular motion around the virtual steering kingpin, even when the wheel rotates to a certain angle, the two tie rods can cause the problem of other death, etc. due to the overconstrained condition. In addition, in the steering mechanism, the two steering pull rods are required to be horizontally arranged, the space occupation is large, the space arrangement mode is relatively inflexible, and meanwhile, the steering mechanism is a pure steer-by-wire steering device and cannot be suitable for a non-steer-by-wire system, and the application type is limited. Disclosure of Invention Therefore, in order to solve the problems, the invention provides a large-angle steering mechanism and an automobile steering chassis system for realizing large-angle steering of wheels. The invention is realized by the following technical scheme: The large-angle steering mechanism is used for driving a steering frame connected to wheels to steer, two free ends of the steering frame are respectively hinged with a first driving assembly and a second driving assembly, each of the first driving assembly and the second driving assembly comprises a connecting rod and a pull rod which are hinged with each other, the connecting rods are respectively hinged with one free end of the s