Magnet Holding Structure for Steering Lock Apparatus
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Solution Overview
Problem
Conventional magnet-holding structures for magnetic position detectors in steering lock apparatuses require additional components to prevent magnet displacement, increasing costs and complexity.
Innovation Solution
A magnet-holding structure that utilizes a magnet receptacle portion formed from a metal material, where the magnet is magnetically held in place by a magnetic attraction force between the magnet and a metal component, eliminating the need for a separate fastening component like a U-shaped magnet cover member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a U-shaped magnet cover member is used to prevent magnet displacement, then the magnet is securely held, but the number of components and assembly cost increase
Solution Approach 1:
The magnet holding function is merged with the existing magnet receptacle portion structure. The receptacle portion is designed with specific geometric features (such as engagement protrusions or interference-fit structures) that inherently secure the magnet without requiring a separate U-shaped cover member. This integration eliminates the additional component while maintaining the security of magnet fixation.
2Reliability
If a U-shaped magnet cover member is used to prevent magnet displacement, then the magnet is securely held, but the assembly cost increases
Solution Approach 1:
The magnet securing function is integrated into the magnet receptacle portion itself, eliminating the need for a separate U-shaped cover member. This reduction in component count directly lowers assembly costs and simplifies the manufacturing process while maintaining reliable magnet holding through the receptacle's built-in structural features.
3Device complexity
If fewer components are used to hold the magnet, then cost is reduced, but the magnet may become displaced
Solution Approach 1:
The magnet receptacle portion incorporates localized structural features (such as engagement protrusions, interference-fit geometries, or specific surface treatments) at the contact points with the magnet. These localized quality enhancements provide secure magnet holding without requiring additional components throughout the entire structure, thus maintaining reliability while reducing overall device complexity.
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 solution reduces component and assembly costs while maintaining accurate position detection and ensuring the magnet remains securely attached, even during motor-driven movements of the lock bar.
Implementation Method 1
The magnet is magnetically held and positioned in the magnet receptacle portion by a magnetic attraction force produced between the magnet and at least one of the magnet receptacle portion and the metal component
Data Source
AI summary
A steering lock apparatus for locking a steering shaft of a vehicle. The steering lock apparatus includes a motor and a lock assembly that is moved by the motor. The lock assembly includes a lock bar that moves between a lock position at which the lock bar is engaged with the steering shaft and an unlock position at which the lock bar is disengaged from the steering shaft. A magnet receptacle portion is arranged on the lock assembly. A magnet is attached to the magnet receptacle portion and moved integrally with the lock assembly. A magnetic field detection element detects a present position of the lock assembly based on a magnetic field of the magnet. The magnet is magnetically held and positioned in the magnet receptacle portion by magnetic attraction force produced between the magnet and a part of the lock assembly.