Steering Lock Cylinder Cobblestone Extension Rotation Angle
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Solution Overview
Problem
Mechanical steering locks with key-operated lock cylinders face limitations in achieving large rotation angles due to mechanical specifications, leading to restricted torsion angles and potential unintentional locking issues.
Innovation Solution
A mechanical steering lock design featuring a rigid cobblestone extension integrated with the lock cylinder, a cam wheel with a lifting rod, and a helical compression spring, allowing for a large rotation angle of up to 155° while preventing unintentional locking, with a compact and cost-effective structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock cylinder is designed with a limited width to guide the cobblestone securely, then mechanical stability is improved, but the rotation angle is restricted and cannot exceed a certain threshold
Solution Approach 1:
The locking mechanism is divided into two independent functional segments: the original cobblestone for steering lock function and the cobblestone extension for rotation angle extension. This segmentation allows each component to perform its specific function independently, enabling the lock cylinder to achieve both secure guidance and large rotation angle (up to 155°) without compromising either requirement
2Length of moving object
If additional components are added to extend the rotation angle, then the rotation angle is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The cobblestone extension is rigidly connected to the lock cylinder as an integrated component, merging the extension function with the existing cylinder structure. This combining approach avoids the need for separate extension mechanisms and additional guiding components, thereby extending the rotation angle while maintaining simple structure and low manufacturing cost
3Object-affected harmful factors
If the cobblestone is positioned close to the longitudinal axis to deactivate locking protection, then unintentional locking is prevented, but the locking protection coverage angle is reduced
Solution Approach 1:
The solution transitions from radial positioning to axial positioning for controlling locking protection. The cobblestone is arranged perpendicular to the lock cylinder axis, allowing it to be moved along the axial direction to engage or disengage the locking protection. This dimensional change enables the cobblestone to provide extensive angular coverage (over 85°) while preventing unintentional locking through axial positioning control
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 design enables a high rotation angle of the lock cylinder while ensuring mechanical stability and protection against unintentional locking, maintaining functional reliability and compactness.
Implementation Method 1
a helical compression spring arranged between the lifting rod and the anvil
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The steering lock (1) has a lock cylinder that is actuated by a key (10) having a head block (11), and a counter-holder (20) having a retainer nose-like portion (28). A cam element (30) is formed on an outer surface of a lifting cam (31), and a lifting rod (40) is moved in a stroke axis between a locking position for locking a steering shaft and a release position for releasing the steering shaft. A rigid cobblestone extension (13) is formed together with head block, for large angle of rotation of lock cylinder of more than 85[deg] .