Wire-Based Steering Angle Limiter for Low-Friction SbW Shafts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing steering angle limiting devices in steer-by-wire (SbW) systems face issues such as slip phenomena due to imperfect contact between mechanical stoppers, unintended friction, and complex assembly, leading to excessive rotation and assembly challenges.
Innovation Solution
A steering angle limiting device utilizing a wire mechanism where a wire with a stopper is fixed to a bracket and passes through a wire hole in the steering shaft, allowing the wire to wind and unwind to limit rotation, eliminating the need for screw rotation and reducing friction and noise, with adjustable wire length for easy setup and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical end stop with screw rotation is used to limit steering angle, then the steering angle can be limited, but friction and noise increase due to screw rotation contact
Solution Approach 1:
The patent replaces the traditional screw rotation mechanical contact system with a wire-based tension system. The wire passes through a guide hole and connects to a stopper, using wire tension and guide hole contact instead of screw threads. This substitution eliminates the sliding friction and noise associated with screw rotation while maintaining the steering angle limiting function through wire tension control.
2Reliability
If traditional mechanical end stops with multiple components are used, then steering angle can be limited, but assembly complexity increases
Solution Approach 1:
The patent merges multiple traditional mechanical end stop components into a simplified wire-based system. The wire, guide hole, and stopper work together as an integrated tension control mechanism, replacing complex multi-component mechanical stoppers with cams, nuts, and adjustment mechanisms. This merging reduces the number of parts and simplifies assembly while maintaining reliable steering angle limiting functionality.
Data Source
AI summary
The present disclosure provides a steering angle limiting device including a bracket 41 fixed to a column housing 30 surrounding a steering shaft 10, a wire 42 having one end fixed to the bracket 41, and a wire stopper 43 fixed to the other end of the wire 42, wherein the wire stopper 43 is fixed to the other end of the wire 42 in a state where the wire 42 passes through a wire hole 10a formed to pass through the steering shaft 10 in a direction inclined to an axial direction of the steering shaft 10, and a steering apparatus including the same.