Relative Guide Device for Steering Torque and Axis Movement
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Solution Overview
Problem
Conventional steering systems face limitations in generating high effective torque on the wheel carrier and maintaining a linear relationship between actuator rotation angle and wheel steering angle, especially at high steering angles, leading to reduced controllability and limited maximum steering capability.
Innovation Solution
A relative guide device with a telescopic movement apparatus and a parallelogram guide system that allows the steering arrangement to maintain spatial orientation with the vehicle body, enabling linear movement and compensation for steering axis movement, combined with a Cardan shaft for continuous torque transmission and a bevel gear for direct torque introduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional steering systems with fixed wheel-side articulation points are used, then the steering axis remains stationary, but the effective torque drops significantly at high steering angles
Solution Approach 1:
The patent implements a dynamic steering axis that moves perpendicular to the horizontal plane during steering, replacing the conventional fixed steering axis. This is achieved through curved wishbones with specifically shaped articulation points that resolve to create steering axis movement, enabling high effective torque at large steering angles while maintaining controllability throughout the steering range
Solution Approach 2:
The patent changes the geometric parameters of the wheel suspension by using curved wishbones instead of straight ones, with specifically designed articulation point positions. This geometric parameter change enables the steering axis to move during steering, fundamentally altering the torque-angle relationship to maintain high effectiveness at all steering angles
2Force
If lever kinematics with actuator and lever system are used to introduce steering torque, then the steering torque can be transmitted to the wheel carrier, but the relationship between actuator rotation angle and wheel steering angle becomes non-linear
Solution Approach 1:
The patent replaces the conventional lever kinematics system with a direct mechanical connection through the curved wishbone geometry. The steering torque is introduced directly into the wheel carrier via the resolved articulation points of the curved wishbones, eliminating the need for separate actuator links and toe links, and creating a linear relationship between actuator rotation and wheel steering angle
3Force
If fixed connection between bevel gear and axle/wheel suspension is used, then the steering torque can be directly introduced to the wheel carrier, but the steering arrangement cannot compensate for movement of the steering axis
Solution Approach 1:
The patent creates a dynamically connected steering arrangement that moves with the wheel carrier while maintaining its functional relationship. The steering arrangement is connected to the wheel carrier in such a way that it automatically compensates for the movement of the steering axis, allowing direct torque introduction while adapting to changing geometric conditions during steering
Data Source
AI summary
A relative guide device (1) for a steering arrangement (31) is arranged on the wheel-carrier side for the spatial guidance and maintenance of the relative spatial orientation of the steering arrangement (31) with respect to a vehicle body (40). At least one telescopic movement apparatus (2) for movably connecting the steering arrangement (31) is arranged on the wheel-carrier side to the vehicle body (40). A steering force transmission device (30) transmits a steering force to a wheel (R) of a vehicle having a relative guide device (1), and to a wheel suspension (50) for a vehicle.