Steer-by-Wire Rotation Limitation Module Design
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Solution Overview
Problem
Existing rotation limitation modules for steer-by-wire steering systems are complex, costly, and noisy, with multiple moving parts that cause irritating noise during operation.
Innovation Solution
A simple and cost-effective rotation limitation module with a limiter disk and detent rings, where the limiter disk is coupled to a shaft portion via a sliding guide and an external thread, allowing precise axial movement to limit steering wheel rotation, reducing noise and complexity by using a few components and minimizing mechanical contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple moving parts and mechanical contacts are used in rotation limitation modules, then the rotation limitation function is achieved, but noise is generated during operation
Solution Approach 1:
The patent combines multiple functions into a single integrated structure. The limiter disk integrates the thread-driven axial movement mechanism with the detent wing engagement system, eliminating the need for separate moving parts for each function. This merging reduces the number of mechanical contacts and thereby reduces noise generation.
Solution Approach 2:
The patent extracts the essential rotation limitation function from complex multi-component systems and implements it through a simplified mechanism using only a limiter disk with thread engagement and detent wings. By taking out only the necessary components needed for rotation limitation, the design minimizes moving parts and associated noise.
2Device complexity
If a compact design with minimal components is used, then noise is reduced and cost is lowered, but precise rotation angle limitation must be maintained
Solution Approach 1:
The patent uses parameter changes in the thread pitch and detent wing positioning to precisely control the rotation angle limitation. By carefully selecting the thread pitch, the axial displacement per rotation is precisely determined, which translates to specific rotation angle limits when the detent wings engage. This allows precise rotation control with minimal components.
Solution Approach 2:
The patent converts rotational movement into axial linear movement through the thread mechanism, and then uses axial positioning of detent wings to limit rotation. This dimensionality change from rotational to linear control enables precise rotation angle limitation through simple axial positioning rather than complex rotational mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The module effectively limits steering wheel rotation with a soft detent feel, reducing noise and surprise to the user, while maintaining reliability and precision with a compact, low-noise design.
Implementation Method 1
a limiter disk (22) which by way of a sliding guide (24) is coupled in a rotationally fixed and axially displaceable manner to the shaft portion (14a) and has an external thread (26) which is driven into an internal thread (28) of the housing (20)
Data Source
AI summary
Described is a rotation limitation module for a steer-by-wire steering system. Said rotation limitation module comprises a housing in which a shaft portion that is rotatable about a central axis and is able to be rotatably coupled to a steering wheel shaft or is configured as a portion of the steering wheel shaft is received. Furthermore provided is a limiter disk which by way of a sliding guide is coupled in a rotationally fixed and axially displaceable manner to the shaft portion and has an external thread which is driven into an internal thread of the housing. Moreover, the rotation limitation module comprises a first detent ring having a first detent wing, and a second detent ring having a second detent wing, both detent wings for limiting a rotation of the shaft portion being able to cooperate with the limiter disk. A steering wheel module for a steer-by-wire steering system is also disclosed, which comprises such a rotation limitation module.