Self-Centering Guide Bushing for Telescoping Steering Columns
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Solution Overview
Problem
Existing telescoping steering column systems face challenges in maintaining proper alignment and preventing relative rotation between the upper and lower steering jackets, while allowing for telescoping movement without generating noise.
Innovation Solution
A steering column jacket assembly featuring a guide bracket with a self-centering guide bushing that inhibits relative rotation between the upper and lower steering jackets, while allowing for telescoping movement and minimizing noise through the use of a lubricious polymeric material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a guide bushing is used to self-center and inhibit relative rotation between steering jackets, then alignment and rotational stability are improved, but friction during telescoping movement increases
Solution Approach 1:
The guide bushing is made from a polymeric material with specific friction characteristics that allow it to provide rotational inhibition while maintaining low friction for telescoping movement. The material parameters are selected to achieve the desired balance between stability and smooth movement.
Solution Approach 2:
The guide bushing utilizes a polymeric material that combines rotational stability with low friction properties, creating a composite solution that addresses both the need for alignment stability and smooth telescoping movement simultaneously.
2Strength
If metal-on-metal contact is used between steering jackets, then structural strength is improved, but noise generation increases
Solution Approach 1:
The guide bushing acts as an intermediary element between the steering jackets, replacing direct metal-on-metal contact with polymer-to-metal contact. This intermediary material reduces noise generation while maintaining the necessary structural strength through the polymeric material's mechanical properties.
3Manufacturing precision
If rotational play is removed between steering jackets, then alignment precision is improved, but friction during telescoping movement increases
Solution Approach 1:
The guide bushing's dimensional parameters and material properties are optimized to provide precise centering and rotational inhibition while maintaining sufficient clearance and low friction for smooth telescoping movement. The polymer material's coefficient of friction is specifically selected to achieve this balance.
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 solution effectively maintains alignment and prevents relative rotation between the steering jackets, while allowing for smooth telescoping movement and reducing noise generation, thus enhancing the robustness and quiet operation of the steering system.
Implementation Method 1
A guide bushing self-centering the first steering jacket and the second steering jacket relative to one another and inhibiting relative rotation between the first steering jacket and the second steering jacket
Implementation Method 2
minimizing friction between the upper and lower steering jackets during intended telescoping movement
Data Source
AI summary
A steering column jacket assembly for a steering system of motor vehicle includes a first steering jacket extending along a longitudinal axis and a second steering jacket arranged for telescoping movement relative to the first steering jacket along the longitudinal axis. A guide bracket is fixed to the second steering jacket. The guide bracket has a guide bushing disposed between the guide bracket and the first steering jacket, the guide bushing self-centering the first steering jacket and the second steering jacket relative to one another to inhibit relative rotation between the first steering jacket and the second steering jacket.