Self-locking Telescope Actuator for Steering Column Energy Absorption
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Solution Overview
Problem
Telescope actuators in steering column assemblies often render energy absorption devices inoperable or complicate their design when the steering column is in manual mode, limiting design options and functionality.
Innovation Solution
A self-locking telescope actuator that operates in both powered and manual modes, incorporating a shuttle assembly and clutch device to enable axial translation and rotational motion, allowing the energy absorption device to function effectively in both states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional telescope actuator is used in manual mode, then the steering column can be manually adjusted, but the energy absorption device becomes inoperable or design options are limited
Solution Approach 1:
The actuator system is segmented into separate functional components: a clutch device that can disengage the power transmission elements, allowing the energy absorption device to operate independently in manual mode while maintaining its own functional integrity
Solution Approach 2:
The system dynamically transitions between powered and manual modes through the clutch mechanism, which can engage or disengage based on operational requirements, allowing the energy absorption device to be rendered inoperable only when power is applied
2Adaptability or versatility
If a traditional telescope actuator with clutch is used, then both powered and manual modes are enabled, but the design becomes more complex
Solution Approach 1:
The clutch device is integrated directly into the actuator assembly, merging the mode-selection function with the existing actuator structure rather than adding a separate control system, thereby reducing overall complexity while maintaining dual-mode capability
Solution Approach 2:
The actuator components serve multiple functions: the power transmission elements enable powered operation when engaged, and their disengagement allows manual operation, with the same structural elements serving both purposes
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
Enables the energy absorption device to operate seamlessly in both powered and manual modes, enhancing crashworthiness and simplifying design options for steering column assemblies by decoupling during energy absorption events.
Implementation Method 1
The telescope actuator includes a rod extending along a centerline, a nut threaded to the rod, and a casing in operable contact with the nut. Rotational motion along with axial translational motion is induced between the rod and the nut when at least in at least a power state.
Data Source
AI summary
An extendable steering column assembly includes a steering shaft, an energy absorption device, and a self-locking telescope actuator. The steering shaft is configured to rotate about an axis, and includes a forward shaft portion mounted for rotation to a fixed support structure, and a rearward shaft portion mounted for rotation to a jacket. The rearward shaft portion is configured to axially translate with the jacket. The energy absorption device is engaged to the jacket. The telescope actuator includes a rod extending along a centerline, a nut threaded to the rod, and a casing in operable contact with the nut. Rotational motion along with axial translational motion is induced between the rod and the nut when at least in at least a power state.