Steer-by-Wire Steering Stopper for Rotation Limit Stability
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Solution Overview
Problem
In steer by wire steering apparatuses, the lack of mechanical connection between the steering wheel and wheels leads to indefinite rotation of the steering wheel, reducing steering feel and stability.
Innovation Solution
A steer by wire steering apparatus with a rotatable ring member, housing, and stopper member mechanism that mechanically limits the steering wheel's rotation at maximum points, using an arc-shaped guide groove and stopper partition to prevent further rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a steer by wire steering apparatus is used to eliminate mechanical connecting devices, then the steering operation convenience is improved, but the steering wheel may rotate indefinitely which reduces steering feel and stability
Solution Approach 1:
A stopper member is introduced as an intermediary mechanical element between the steering shaft and the environment. This stopper member engages with a guide groove to prevent the steering shaft from rotating beyond a predetermined angle, thereby providing steering stability while preserving the steer-by-wire system's operational convenience. The stopper member acts as a mechanical mediator that limits rotation without interfering with normal steering operations.
2Device complexity
If mechanical connecting devices are removed in steer by wire system, then the steering system complexity is reduced, but the steering wheel rotation control is lost
Solution Approach 1:
The invention extracts only the essential rotation-limiting function from complex mechanical connecting devices. Instead of using a full mechanical linkage system, a simplified stopper member engaging with a guide groove is employed. This extracted mechanism provides the necessary rotation control reliability while maintaining the overall simplicity and low complexity of the steer-by-wire system.
3Adaptability or versatility
If the steering wheel is allowed to rotate freely, then the steering operation flexibility is improved, but the steering safety is reduced when wheel rotation reaches maximum point
Solution Approach 1:
The stopper member is pre-positioned within the guide groove structure to provide preliminary opposition to excessive steering shaft rotation. Before the steering shaft can rotate beyond the safe maximum angle, the stopper member engages with the guide groove surface to prevent further rotation. This preliminary anti-action ensures steering safety is maintained while preserving operational flexibility within the normal steering range.
Data Source
AI summary
A steer by wire type steering apparatus may include a rotating ring member that is coupled to a steering shaft and rotates in conjunction with the steering shaft, a housing that is provided with an arc-shaped guide groove centered on the steering shaft and a stopper partition that connects radially inner and outer surfaces of the guide groove, and a stopper member that is inserted into the guide groove and is supported by one end portion of the rotating ring member and rotates in a case where the steering shaft rotates.