Steering Column Decoupling via Worm Actuator
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Solution Overview
Problem
Automated transitioning between a coupled and decoupled steering column in vehicle steering systems is challenging, particularly in vehicles equipped with advanced driver assist systems (ADAS) that require the steering wheel to be non-rotatable for driver engagement in non-steering activities.
Innovation Solution
A steering column decoupling system comprising a steering shaft, an intermediate shaft, a driving disk, a driven disk, a coupling element, and an actuation mechanism with a motor-driven worm actuator and pivotable engagement crank, allowing the driven disk to move between a column coupled and decoupled position, enabling seamless switching between mechanical coupling and decoupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the steering wheel is stowed to enable non-steering activities, then the driver can engage in reading, working, etc., but the steering column must be in a non-rotatable condition which complicates the transitioning mechanism
Solution Approach 1:
The steering column is divided into separable components: a steering shaft, an intermediate shaft, and a coupling element. The coupling element can be disengaged from the intermediate shaft to decouple the steering column, allowing the steering wheel to be stowed while maintaining the ability to re-engage when needed. This segmentation enables independent movement of the steering wheel from the steering gear.
Solution Approach 2:
The steering column system transitions from a static coupled state to a dynamic decoupled state through an actuation mechanism. The coupling element is designed to be movable between engaged and disengaged positions, allowing the system to adapt its configuration based on whether manual steering or automated steering is required.
2Ease of operation
If automated transitioning between coupled and decoupled positions is implemented, then seamless switching is achieved, but the actuation mechanism complexity increases
Solution Approach 1:
An actuation mechanism serves as an intermediary device between the driver's steering input and the coupling element. This mechanism automatically controls the engagement and disengagement of the coupling element based on steering commands, eliminating the need for manual intervention while managing the complexity through a dedicated control system.
Solution Approach 2:
The steering system incorporates self-service capabilities where the actuation mechanism automatically manages the coupling state based on detected steering requirements. The system monitors steering commands and autonomously transitions between coupled and decoupled states without requiring manual operation of the coupling mechanism.
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
Facilitates automated and efficient switching between coupled and decoupled steering column positions, accommodating both manual and ADAS driving modes, enhancing user convenience and system autonomy.
Implementation Method 1
The actuation mechanism includes a motor. The actuation mechanism also includes a worm actuator driven by the motor.
Data Source
AI summary
A steering column decoupling system includes a steering shaft. Also included is an intermediate shaft. Further included is a driving disk operatively coupled to the steering shaft and rotatable therewith. Yet further included is a driven disk operatively coupled to the intermediate shaft and rotatable therewith, the driven disk disposed adjacent the driving disk. Also included is a slot defined by the driven disk. Further included is a coupling element coupled to the driving disk and disposed within the slot, the driven disk moveable relative to the coupling element between a column coupled position and a column decoupled position.