Steer-by-Wire Steering Stopper for Rotation Limit Feedback
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Solution Overview
Problem
In steer by wire type steering apparatuses, the lack of mechanical connection between the steering wheel and wheels results in indefinite rotation of the steering wheel, reducing steering feel and stability.
Innovation Solution
A steer by wire type steering apparatus is designed with a first and second rotating ring member, a housing with an arc-shaped guide groove and stopper partition, and a stopper member to mechanically prevent the steering wheel from rotating beyond a maximum point, enhancing steering feel and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a steer by wire type steering apparatus is used to eliminate mechanical connecting devices, then convenience in driving operation is improved, but the steering wheel can rotate indefinitely which reduces steering feel and steering stability
Solution Approach 1:
The steering apparatus is segmented into multiple functional components: a steering shaft for rotation, a pinion shaft connected to the steering shaft, a rack bar connected to the pinion shaft, and tie rods connecting the rack bar to the wheels. This segmentation allows elimination of direct mechanical connection between steering wheel and wheels while maintaining controlled motion transmission through intermediate segments, preventing indefinite rotation and improving steering stability.
2Device complexity
If mechanical connecting devices are removed between steering wheel and wheels, then device complexity is reduced, but steering feel is reduced due to indefinite rotation of steering wheel
Solution Approach 1:
A pinion shaft acts as an intermediary component between the steering shaft and the rack bar. The pinion shaft converts the rotational motion of the steering shaft into linear motion of the rack bar through gear engagement, providing mechanical feedback and preventing indefinite rotation of the steering wheel while maintaining reduced device complexity.
3Ease of operation
If a pinion shaft and rack bar are used for motion transmission, then steering control is improved, but the steering wheel can still rotate beyond maximum point when pinion shaft rotates more than one revolution
Solution Approach 1:
A stopper member is pre-positioned in the housing to limit the rotation of the pinion shaft. Before the pinion shaft can rotate more than one revolution and cause the steering wheel to exceed its maximum rotation point, the stopper member physically blocks further rotation, ensuring precise rotation limits are maintained and steering control is preserved.
Data Source
AI summary
According to the present embodiments, it is possible to provide a steer by wire type steering apparatus capable of improving a steering feel and steering stability of a driver by mechanically preventing a steering wheel from rotating any further in a case where rotation of the wheel reaches the maximum point.