Steering Column Adaptive Energy Absorption System
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Solution Overview
Problem
Current telescopically adjustable steering columns lack effective energy absorption mechanisms to manage varying load conditions during vehicle impact events, particularly in transitioning between high-load and low-load collapse scenarios.
Innovation Solution
The steering column assembly incorporates a telescope actuator assembly with a drive bracket and actuator, coupled with first and second energy absorption straps that adaptively absorb energy by rolling during collapse events, with the actuator's pin positioning and biasing member controlling the absorption based on load thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a telescopically adjustable steering column is implemented, then adjustability and versatility are improved, but energy absorption capability during impact events deteriorates
Solution Approach 1:
The steering column is divided into multiple segments including a collapsible column jacket with telescopic sections that can independently deform during impact events. This segmentation allows the column to absorb energy through controlled collapse while maintaining adjustability features
Solution Approach 2:
Energy absorption straps are pre-installed within the telescopic mechanism to provide cushioning during collapse events. These straps are positioned in advance to engage when the column experiences impact loads, absorbing energy before the collapse is complete
2Loss of energy
If the column jacket is made collapsible for energy absorption, then energy management during impact is improved, but structural strength and stability deteriorate
Solution Approach 1:
Different sections of the column jacket have different structural properties - the telescopic sections are designed to collapse while other sections maintain structural integrity. The energy absorption straps are strategically positioned to provide localized reinforcement during collapse
Solution Approach 2:
The column combines collapsible jacket sections with reinforcement elements including energy absorption straps and actuators. This composite structure allows controlled collapse in specific regions while maintaining overall structural strength through the reinforcement elements
3Adaptability or versatility
If an actuator with pin mechanism is added for load-based control, then adaptive energy absorption is improved, but device complexity increases
Solution Approach 1:
The actuator mechanism uses the load itself to trigger the appropriate response - when collapse loads exceed the actuator's operational threshold, the pin automatically refracts to engage energy absorption straps, eliminating the need for external sensors or control systems
Solution Approach 2:
The actuator serves as an intermediary element between the collapsible column jacket and the energy absorption straps. It translates high collapse loads into the engagement of straps through pin refraction, providing controlled energy absorption without direct complex control systems
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 adaptive energy absorption system effectively decelerates the steering column during collapse events by providing a variable drag load, ensuring effective energy management across both high-load and low-load conditions, enhancing safety and stability.
Implementation Method 1
a biasing member configured to bias the pin towards an extended position
Implementation Method 2
The first energy absorption strap includes a first portion defining an opening configured to receive the pin and a second portion coupled to the upper jacket assembly
Data Source
AI summary
A steering column assembly includes an upper jacket assembly received within a lower jacket assembly, and an energy absorption assembly. The energy absorption assembly includes a first energy absorption strap and a second energy absorption strap. The first energy absorption strap has a first portion defining an opening configured to receive a pin of an actuator and a second portion coupled to the upper jacket assembly. The second energy absorption strap has a third portion coupled to a telescope drive bracket and a fourth portion coupled to the upper jacket assembly.