Steering Device Telescopic Adjustment Stopper Mechanism
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Solution Overview
Problem
Conventional steering devices with telescopic adjustment mechanisms face challenges in maintaining a consistent telescopic adjustment range and are prone to deviations due to the complex configuration and risk of collision between the limiting member and the inner shaft during impact absorption in secondary collisions.
Innovation Solution
A steering device with a simplified mechanism featuring a column pipe, hanger bracket, fixed bracket, fastening tool, stopper member, and telescopic regulating member, where the stopper member can abut the telescopic regulating member only in an unlocked state, allowing independent operation and preventing collision during impact absorption, thus maintaining stable load characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the limiting member is configured to protrude from the opening of the cylinder portion through rotation of the operation lever portion via the link member, then the telescopic adjustment range can be regulated, but the amount of protrusion changes depending on the rotation angle making parts dimension control complicated
Solution Approach 1:
The stopper member is designed to swing between two positions (first position for telescopic adjustment, second position for impact absorption) based on the operational state, allowing the system to adapt its configuration dynamically rather than relying on precise dimensional control of a fixed protruding limiting member
Solution Approach 2:
The function of the limiting member is separated into two independent components: the stopper member attached to the operation lever for telescopic adjustment, and the telescopic regulating member for impact absorption. This extraction eliminates the need for complex dimensional control while maintaining both functions
2Ease of operation
If the limiting member becomes vertical and protrudes from the opening during operation lever rotation, then telescopic adjustment is enabled, but the limiting member may be pushed back by the inner shaft force during impact absorption causing tilting and deviation in telescopic adjustment range
Solution Approach 1:
The limiting function is divided into two separate members: the stopper member that swings to the first position during telescopic adjustment and the telescopic regulating member that remains positioned for impact absorption. This segmentation ensures that during impact absorption, the stopper member does not interfere with the telescopic regulating member, maintaining reliability and independent operation
Solution Approach 2:
Instead of having a single limiting member that protrudes and risks collision, the invention uses a stopper member that swings away from the telescopic regulating member's path during normal operation, and only engages when needed. This inverted approach prevents the collision problem while maintaining both functions
3Ease of operation
If a complex limiting member mechanism is used to regulate telescopic adjustment, then adjustment range control is achieved, but the device complexity increases and cost increases
Solution Approach 1:
The stopper member swings between positions based on operational needs rather than requiring a complex fixed limiting structure. This dynamic approach simplifies the overall mechanism while maintaining effective telescopic adjustment range control
Solution Approach 2:
The operation lever serves multiple functions: it controls the stopper member for telescopic adjustment and simultaneously controls the impactor for impact absorption. This multi-functionality reduces the need for separate complex limiting mechanisms, simplifying the overall device structure
Data Source
AI summary
A steering device according to the present invention has: a column pipe; a hanger bracket; an outer column that covers the column pipe in such a manner that the column pipe can move in a front-back direction; a fixed bracket that sandwiches the outer column; a fastening tool that has a bolt shaft and an operation lever portion, is inserted into a long hole of the hanger bracket, and locks and unlocks the outer column and the fixed bracket; a stopper member that is provided in the bolt shaft and swings as the bolt shaft rotates; and a telescopic regulating member that moves in the front-back direction together with the column pipe. The stopper member is capable of coming into abutment with the telescopic regulating member in an unlocked state but is not capable of coming into abutment with the telescopic regulating member in a locked state.