Steering Column Energy Absorption with Adjustable Collapse Load
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Solution Overview
Problem
Existing steering column assemblies lack the ability to vary kinetic energy dissipation during a collapse event, which is essential for adapting to different impact conditions.
Innovation Solution
A steering column assembly with a jacket assembly and an energy absorption system comprising first and second energy absorption straps and an actuator, allowing for adjustable kinetic energy dissipation by varying the collapse load through the actuator's position, enabling either high or low load collapse configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed collapse load is used in the steering column assembly, then the structure is simpler, but the ability to adapt to different impact conditions is reduced
Solution Approach 1:
The patent implements a dynamic energy absorption system where the collapse load can be adjusted between high and low positions using an actuator. The energy absorption straps are configured to engage at different positions along the steering column, allowing the system to adapt its characteristics based on impact conditions rather than being fixed.
Solution Approach 2:
The patent changes the physical parameter of collapse load position to achieve different energy absorption characteristics. By varying the engagement position of the energy absorption straps (high or low positions), the system modifies its mechanical properties to suit different impact scenarios, transforming a static structure into one with variable parameters.
2Use of energy by moving object
If a single energy absorption strap configuration is used, then the device is simpler, but the ability to provide variable kinetic energy dissipation is limited
Solution Approach 1:
The patent divides the energy absorption function into multiple segments by using separate first and second energy absorption straps. Each strap is configured to engage at different positions, allowing independent control of energy absorption characteristics. This segmentation enables the system to provide variable kinetic energy dissipation by selectively engaging different strap configurations.
Solution Approach 2:
The energy absorption straps are arranged in a nested configuration where the second strap is disposed about the first strap. This nesting allows both straps to be integrated within the same structural space while maintaining their distinct functions, enabling variable energy dissipation without proportionally increasing overall device complexity.
3Adaptability or versatility
If the actuator is always engaged, then the collapse load is always controlled, but the system cannot provide both high and low load configurations
Solution Approach 1:
The actuator is designed to be selectively engageable rather than permanently engaged, allowing the system to dynamically switch between high and low load configurations. This selective engagement capability provides adaptability while maintaining structural simplicity when the actuator is not in use.
Solution Approach 2:
The actuator can be extracted or disengaged from the energy absorption strap assembly, allowing the system to operate in different modes. When the actuator is removed or disengaged, the straps can assume their natural collapsed configuration, providing both high and low load options without requiring the actuator to be permanently integrated.
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 system effectively manages kinetic energy dissipation by adapting the collapse load based on the actuator's position, providing either high or low drag forces during a steering column collapse event, enhancing safety by optimizing energy absorption according to impact conditions.
Implementation Method 1
The first energy absorption strap is coupled to the second energy absorption strap such that the second energy absorption strap rotates relative to the first energy absorption strap during a steering column collapse event
Implementation Method 2
Roll strap devices are used as a means to absorb kinetic energy during a vehicle impact event in which the steering column may collapse
Data Source
AI summary
An energy absorption assembly includes a first energy absorption strap and a second energy absorption strap. The first energy absorption strap is coupled to a lower jacket assembly and is coupled to an upper jacket assembly. The energy absorption strap defines a first opening and a second opening. The second energy absorption strap is disposed about the first energy absorption strap. The second energy absorption strap is coupled to the first energy absorption strap. The second energy absorption strap defines a third opening proximately aligned with the second opening.