Ball Coupling Assembly for Steering Column Decoupling
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Solution Overview
Problem
In autonomous or semi-autonomous vehicles, the rotating driver interface can cause confusion, inconvenience, or harm during autonomous driving mode due to the decoupling of the steering actuator from the driver interface, necessitating a solution to maintain the steering wheel in a stationary position while allowing independent rotation of the steering shafts.
Innovation Solution
A ball coupling assembly is implemented in the steering column assembly, allowing the upper and lower column steering shafts to switch between a coupled and decoupled condition using a plurality of balls and a collar actuating mechanism, enabling the steering wheel to remain stationary during autonomous driving by independently rotating the lower steering shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the steering wheel is decoupled from the lower steering shaft to allow independent rotation during autonomous driving, then the steering wheel can remain stationary reducing driver confusion, but the driver loses the ability to manually steer
Solution Approach 1:
The ball coupling assembly enables dynamic switching between coupled and decoupled states. The collar can be axially translated to move balls between engagement positions (for manual steering) and disengagement positions (for autonomous mode), allowing the system to adapt its connectivity state based on operational requirements
Solution Approach 2:
The ball coupling assembly acts as an intermediary mechanism between the upper and lower steering shafts. It provides a controlled interface that can selectively transmit or block rotational motion, enabling smooth transitions between manual and autonomous driving modes without direct mechanical coupling
2Object-affected harmful factors
If a ball coupling assembly is implemented to switch between coupled and decoupled conditions, then the steering wheel can be maintained stationary during autonomous driving, but the device complexity increases
Solution Approach 1:
The coupling mechanism is segmented into discrete components: multiple balls, a collar with actuating mechanism, and engagement surfaces on the steering shafts. This segmentation allows each component to perform a specific function and enables modular assembly and maintenance
Solution Approach 2:
The invention replaces complex continuous mechanical coupling (such as splines or gears) with a simpler ball-and-socket type engagement system. The balls engage with circumferential surfaces to transmit rotation when coupled, and can be easily retracted when decoupled, reducing mechanical complexity
Data Source
AI summary
A steering column assembly for an autonomous or semi-autonomous vehicle includes a steering wheel and an upper steering shaft rigidly coupled to the steering wheel. Also included is a lower steering shaft operatively coupled to the upper steering shaft. Further included is a ball coupling assembly comprising balls retained within the upper steering shaft, the balls disposed in a first radial position that engages the balls with the upper steering shaft and the lower steering shaft to place the steering shafts in a coupled condition, the balls disposed in a second radial position that disengages the balls from at least one of the upper steering shaft and the lower steering shaft to place the steering shafts in a decoupled condition.