Steering Column Assembly With Integrated Strap Energy Absorption
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Solution Overview
Problem
Current steering column assemblies with kinetic energy absorption devices often rely on separate energy absorption assemblies that are not seamlessly integrated, which can lead to inefficiencies in impact management.
Innovation Solution
The integration of an energy absorption strap within the lower jacket assembly of a steering column assembly, featuring a cutout engaging with an upper jacket's engagement tab and a roll strap feature, along with a clamp bolt, provides a unified and efficient energy absorption mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate energy absorption assembly is attached to the steering column assembly, then energy absorption capability is provided, but device complexity increases and integration efficiency decreases
Solution Approach 1:
The energy absorption strap is integrally formed with the lower jacket assembly, merging the energy absorption function directly into the steering column structure. This eliminates the need for separate attached assemblies, reducing device complexity while maintaining energy absorption capability through the unified design where the strap is a built-in component rather than an external attachment
2Loss of energy
If metal distortion methods are used for energy absorption, then kinetic energy is managed, but structural integrity may be compromised
Solution Approach 1:
The lower jacket assembly is segmented into multiple functional zones: a rigid portion for structural support and an energy absorption strap portion for kinetic energy management. This segmentation allows different parts to perform specialized functions - the rigid portion maintains overall structural integrity while the strap portion safely dissipates energy through controlled deformation
3Productivity
If the energy absorption strap is integrally formed with the lower jacket assembly, then integration efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The energy absorption strap is pre-formed as an integral part of the lower jacket assembly during the manufacturing process. This preliminary formation of the strap structure within the jacket assembly allows for optimized integration without requiring complex post-assembly operations, as the strap is already positioned and configured correctly during initial manufacturing
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 integrated design enhances energy absorption capabilities by allowing the energy absorption strap to tear and roll up within the assembly, effectively managing impact forces while maintaining the structural integrity and adjustability of the steering column.
Implementation Method 1
an energy absorption strap integrally formed with the lower jacket assembly... allowing the energy absorption strap to tear and roll up within the assembly, effectively managing impact forces
Data Source
AI summary
A steering column assembly includes a lower jacket assembly extending longitudinally from a first end to a second end and having an energy absorption (EA) plate. The steering column assembly also includes an upper jacket assembly at least partially received within the lower jacket assembly. The steering column assembly further includes an energy absorption strap integrally formed with the lower jacket assembly.