Segmented Steering Column Clamp for Smooth Sliding and Holding Load
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Solution Overview
Problem
Existing steering column designs face a compromise between smooth sliding and high holding loads due to the round interface between upper and lower jackets, requiring additional anti-rotation features that increase cost and complexity.
Innovation Solution
A clamping assembly with a segmented upper jacket and parallel/ perpendicular sides, decoupling sliding and clamping forces by using different coefficients of friction and integrating anti-rotation features into the jacket design, eliminating the need for additional anti-rotation components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a round interface is used between upper and lower jackets, then smooth sliding is achieved, but holding load capability deteriorates
Solution Approach 1:
The upper jacket is segmented into multiple sections (first section, second section, third section) with different cross-sectional shapes. The first and second sections have shapes optimized for clamping (non-round), while the third section maintains a round shape for smooth sliding. This segmentation allows each section to perform its specific function independently, resolving the contradiction between sliding smoothness and holding load capability.
Solution Approach 2:
Different sections of the upper jacket are given different local qualities - specifically different cross-sectional shapes tailored to their functional requirements. The clamping sections have geometries that provide high friction and mechanical interlocking, while the sliding section has a round geometry that minimizes friction. This local differentiation allows the single component to optimize both contradictory requirements in their respective zones.
2Ease of operation
If a round interface is used between upper and lower jackets, then smooth sliding is achieved, but anti-rotation capability deteriorates
Solution Approach 1:
The anti-rotation function is merged with the clamping sections of the upper jacket. The non-round cross-sectional shapes of the first and second sections inherently prevent rotation while providing clamping force. This integration eliminates the need for separate anti-rotation features, resolving the contradiction between smooth sliding and anti-rotation capability while reducing device complexity.
Solution Approach 2:
The first and second sections of the upper jacket serve multiple functions simultaneously: they provide clamping force through friction, prevent rotation through their non-round geometry, and maintain structural integrity. This multi-functionality eliminates the need for dedicated anti-rotation components, resolving the contradiction while simplifying the overall device.
3Ease of operation
If additional anti-rotation features are added to the round jacket design, then anti-rotation capability is improved, but device complexity increases
Solution Approach 1:
The anti-rotation function is merged with the clamping sections of the upper jacket. The non-round cross-sectional shapes of the first and second sections inherently prevent rotation while providing clamping force. This integration eliminates the need for separate anti-rotation features, resolving the contradiction between smooth sliding and anti-rotation capability while reducing device complexity.
4Force
If a segmented upper jacket with non-parallel sides is used, then clamping capability is improved, but manufacturing complexity increases
Solution Approach 1:
The upper jacket is divided into three distinct sections, each with optimized geometry for its specific function. The first and second sections have non-parallel sides for enhanced clamping, while the third section is round for smooth sliding. This segmentation allows for targeted manufacturing approaches - the complex sections can be formed using specialized molding or machining, while the simple round section can be manufactured more economically, balancing overall manufacturing complexity with performance requirements.
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
Enhances the steering column's ability to smoothly telescope while maintaining a secure locked position without additional parts, reducing complexity and cost.
Implementation Method 1
the lower jacket contains a split or flexible member that contacts the upper jacket and holds it in place with a friction force
Implementation Method 2
the interface between the upper and lower jackets is the sliding interface for telescoping the column, which benefits from a low coefficient of friction
Data Source
AI summary
A manually adjustable steering column assembly includes a clamping assembly moveable between an unlocked position and a locked position. The steering column assembly also includes a lower jacket. The steering column assembly further includes an upper jacket. The upper jacket comprises a first side and a second side, wherein the second side is segmented to include a first clamping segment, a second clamping segment, and a third segment disposed between, and joining, the first clamping segment and the second clamping segment, wherein the first clamping segment and the second clamping segment are not parallel or perpendicular to the third segment. The upper jacket also includes an upper side. The upper jacket further includes a lower side, wherein the upper side and the lower side have respective outer surfaces which are parallel to each other and perpendicular to the third segment of the second side.