Steer-by-Wire Spiral Guide Mechanism for Rotation Limiting
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Solution Overview
Problem
Steer by wire type steering systems lack mechanical connection between the steering wheel and vehicle wheels, leading to reduced driver steering feeling and stability as the steering wheel can rotate indefinitely, necessitating a solution to prevent further rotation at the maximum vehicle wheel angle.
Innovation Solution
A steer by wire type steering apparatus featuring a rotating member with a spiral guide hole and a guide pin mechanism that mechanically limits the steering wheel's rotation when the vehicle wheel reaches its maximum point, enhancing driver feedback and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a steer by wire type steering system is used to eliminate mechanical connection between steering wheel and vehicle wheels, then ease of operation is improved, but steering stability and driver feedback deteriorate due to indefinite steering wheel rotation
Solution Approach 1:
A guide pin mechanism is introduced as an intermediary component between the rotating member (connected to steering wheel) and the housing. The guide pin travels within a spiral guide hole, creating a mechanical intermediary that transmits rotational motion only up to the maximum steering angle, thereby restoring stability feedback to the driver while preserving the SBW system's operational ease
Solution Approach 2:
The steering system is segmented into distinct functional components: a rotating member with spiral guide hole, a guide pin, and a housing. This segmentation allows the rotation limiting function to be isolated in the guide pin-spiral hole interaction, while the rest of the SBW system maintains its electrically-controlled ease of operation without mechanical connection
2Ease of operation
If the steering wheel is allowed to rotate indefinitely without mechanical connection, then ease of operation is improved, but reliability deteriorates due to loss of rotation limitation
Solution Approach 1:
The guide pin acts as a reliable mechanical intermediary that physically prevents the rotating member from rotating beyond the maximum angle. This intermediary component ensures reliable rotation limitation while allowing the SBW system to maintain its ease of operation through electronic control
3Stability of the object's composition
If a guide pin mechanism with spiral guide hole is added to limit steering wheel rotation, then steering stability is improved, but device complexity increases
Solution Approach 1:
The rotation limiting function is segmented into a separate modular component (rotating member with spiral guide hole and guide pin) that can be independently designed and assembled. This segmentation adds stability functionality while keeping the overall device complexity manageable through clear functional separation
Solution Approach 2:
Instead of using a complex electronic sensor system to detect and limit steering angle, the patent inverts the approach by using a simple passive mechanical structure (spiral guide hole geometry) to inherently limit rotation. This inverted mechanical approach achieves stability with minimal added complexity
Data Source
AI summary
A steer by wire type steering apparatus according to the embodiments of the present disclosure may comprise a rotating member having a spiral guide hole penetrating through one side and the other side in the axial direction and rotating in conjunction with a steering shaft, a housing in which the rotating member is built, a housing cover coupled to one end of the housing, and a guide pin inserted in the axial direction into the guide hole, one end supported by the housing and the other end supported by the housing cover.