Steer-By-Wire Stopper Assembly for Precise Rotation Limiting
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Solution Overview
Problem
Conventional steer-by-wire steering devices face challenges in restricting the maximum rotation angle of the steering wheel due to complex manufacturing and assembly processes, leading to poor mass productivity, high likelihood of misassembly, and potential damage from impacts at the maximum rotation angle.
Innovation Solution
A steer-by-wire steering device incorporating a hollow first stopper with recesses and a hollow second stopper coupled to the steering shaft, along with a nut and guide ring, which restricts the steering wheel's rotation through a simple structure, ensuring precise alignment and assembly, and preventing damage from impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rotation restricting devices are used, then the maximum rotation angle can be restricted, but the manufacturing and assembly processes become complex resulting in poor mass productivity
Solution Approach 1:
The rotation restricting device is divided into separate modular components: a stopper with recesses, a shaft with protrusions, and a retaining member. These segmented parts can be manufactured independently using standard processes and then assembled through simple engagement, eliminating complex integrated manufacturing while ensuring reliable rotation restriction at predetermined angles
Solution Approach 2:
The protrusions on the shaft automatically engage with the recesses on the stopper during assembly without requiring precise alignment or complex fastening operations. The retaining member simply needs to secure the stopper to the shaft, and the rotation restriction function is self-established through the geometric engagement of the protrusion-recess pairs, enabling easy assembly and high mass productivity
2Reliability
If conventional rotation restricting devices are used, then the maximum rotation angle can be restricted, but misassembly between parts is highly likely
Solution Approach 1:
The protrusions and recesses are designed with asymmetric geometric features that provide built-in alignment guidance. The protrusions have specific shapes that can only engage with corresponding recesses in the correct orientation, making it physically impossible to assemble the components incorrectly. This asymmetric design eliminates misassembly risks while maintaining manufacturing simplicity
3Reliability
If conventional rotation restricting devices are used, then the maximum rotation angle can be restricted, but damage to parts and steering wheel idling occurs by impacts at the maximum rotation angle
Solution Approach 1:
The stopper is designed with cushioning elements or compliant features that absorb impact energy when the steering shaft reaches the maximum rotation angle. The recesses and protrusions are configured to engage gradually rather than creating hard stops, and the retaining member allows for controlled deformation that cushions impacts, preventing damage to parts and eliminating steering wheel idling caused by sudden impacts
Data Source
AI summary
A steer-by-wire steering device is provided with: a first stopper shaped hollow; a second stopper shaped hollow and structured such that a steering shaft is coupled to the second stopper, the second stopper including a small diameter portion and a large diameter portion; a nut engaged to a thread formed on an outer circumference surface of the small diameter portion such that the nut is positioned between the first stopper and the large diameter portion of the second stopper; and a hollow guide ring having an outer circumferential surface and an inner circumferential surface, the hollow guide ring provided between a housing and the nut such that the outer circumferential surface is coupled to the housing and the nut is coupled to be supported in the inner circumferential surface in a circumferential direction.