Steering Column Assembly Ball Decoupling Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In autonomous vehicles, a rotating driver interface can cause confusion, inconvenience, or harm during autonomous driving mode, as existing systems fail to effectively decouple the steering wheel from the steering actuator, leading to potential safety issues.
Innovation Solution
A steering column assembly that includes a steering wheel and a steering shaft with an annular recess and pocket system, allowing the steering wheel to transition between a rotationally coupled and decoupled condition using a plurality of balls, enabling the steering wheel to remain stationary during autonomous driving mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steering wheel is decoupled from the steering shaft during autonomous driving mode, then driver safety and clarity are improved, but the complexity of the steering column assembly increases
Solution Approach 1:
The steering column assembly is segmented into distinct functional components: a steering shaft with ball retaining structures, a coupler shaft with ball cage, and multiple balls that act as coupling elements. This segmentation allows the steering wheel to be decoupled from the steering shaft when needed, improving safety by preventing unintended rotation during autonomous mode, while maintaining a manageable structural complexity through modular design
Solution Approach 2:
Multiple balls serve as intermediary elements between the steering wheel and steering shaft. These balls can be selectively retained in different positions by ball retaining structures, acting as a mediator that enables or disables the rotational connection. This intermediary mechanism provides reliable decoupling for safety while using simple spherical elements rather than complex locking mechanisms
2Object-affected harmful factors
If the steering wheel remains stationary during autonomous driving mode, then driver confusion is reduced, but the ease of operation decreases due to additional decoupling mechanisms
Solution Approach 1:
The steering column assembly employs dynamic ball retaining structures that can transition between different states. The balls can move between being retained in the steering shaft (coupled state) and being released (decoupled state). This dynamic capability allows the system to adapt to different driving modes, keeping the steering wheel stationary during autonomous operation to reduce driver confusion, while enabling easy manual operation when coupled
Solution Approach 2:
The ball and ball retaining structure system is designed to be self-actuating through spring mechanisms and geometric constraints. The balls automatically engage or disengage based on the operational state, without requiring additional actuators or complex control systems. This self-service approach maintains ease of operation while achieving the stationary positioning needed to reduce driver confusion during autonomous mode
Data Source
AI summary
A steering column assembly for an autonomous or semi-autonomous vehicle includes a steering wheel. Also included is a steering shaft selectively coupleable to the steering wheel with a plurality of balls, the steering wheel and the steering shaft transitioning between a rotationally coupled condition and a rotationally decoupled condition, the steering wheel in a rotationally stationary position during the decoupled condition.