Steering Column Bending Tab Guide Wall Constraint
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Solution Overview
Problem
Steering columns face challenges in minimizing installation space while preventing the bending tab from raising during a crash, which affects energy absorption and structural integrity.
Innovation Solution
A holding-down device with a guide wall is integrated into the steering spindle bearing unit to limit the raising of the bending leg, ensuring minimal installation space and controlled deformation during energy absorption, using a nondestructively detachable connecting device that secures the bending tab to the bracket unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the bending tab is allowed to raise during relative movement of the steering spindle bearing unit and bracket unit, then the installation space increases, but the energy absorption capability and structural control deteriorate
Solution Approach 1:
The guide wall acts as an intermediary element between the bending tab and the steering spindle bearing unit. It provides a controlled interface that allows the bending tab to deform and absorb energy while preventing uncontrolled raising movements. The guide wall mediates the interaction by providing a defined path for the bending tab's movement, thus resolving the contradiction between space efficiency and energy absorption control.
Solution Approach 2:
The guide wall changes the movement parameters of the bending tab by constraining its raising motion to specific directions and limits. This parameter control ensures that the bending tab deforms within an optimized volume, maintaining both compact installation space and reliable energy absorption capability during crash events.
2Volume of moving object
If the guide wall is positioned closer to the steering spindle bearing unit, then the installation space is minimized, but the raising prevention effectiveness must be precisely controlled
Solution Approach 1:
The guide wall is pre-positioned and pre-configured during manufacturing to provide the optimal balance between space minimization and raising prevention. By establishing the guide wall's position and geometry in advance, the design accounts for tolerance accumulation and ensures that even with manufacturing variations, the bending tab's movement remains controlled within acceptable limits.
Solution Approach 2:
The guide wall provides slightly more constraint than the absolute minimum required, creating a tolerance buffer that accommodates manufacturing variations. This excessive action in terms of constraint ensures that even with positioning tolerances, the bending tab cannot raise beyond safe limits, while still maintaining compact installation space.
3Volume of moving object
If the holding-down device is integrated on the steering spindle bearing unit, then the installation space is reduced, but the complexity of the bearing unit increases
Solution Approach 1:
The holding-down device with the guide wall is merged with the steering spindle bearing unit, integrating multiple functions into a single component. This combination eliminates the need for separate mounting structures and reduces overall installation space, while the modular design of the integrated device keeps the complexity increase manageable by consolidating functions rather than adding separate elements.
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
This solution reduces installation space requirements, maintains controlled energy absorption, and prevents unnecessary bending tab movement, enhancing safety by minimizing injuries during crashes.
Implementation Method 1
at least one bending tab for the energy absorption during a movement of the steering spindle bearing unit relative to the bracket unit by means of deformation of the bending tab
Implementation Method 2
at least one guide wall for delimiting the raising of the bending leg, secured or securable on the bracket unit, from the steering spindle bearing unit during the deformation of the bending tab
Data Source
AI summary
A steering column for a motor vehicle, with a bracket unit for fastening the steering column to the motor vehicle bodywork, and with at least one steering spindle bearing unit for the rotatable mounting of a steering spindle of the steering column, and with at least one bending clip for absorbing energy during a movement of the steering spindle bearing unit relative to the bracket unit by means of deformation of the bending tab. At least two bending limbs of the bending tab are connected to one another by at least one bent-over portion of the bending tab. One of the bending limbs is fastened to the steering spindle bearing unit, and the other bending limb is fastened or can be fastened to the bracket unit by at least one connecting device which can be released without being destroyed.