Magnetic Lock Device Segmented Shaft for Strength and Efficiency
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Solution Overview
Problem
Conventional parking devices face challenges in improving the strength of movable elements subjected to orthogonal loads while maintaining magnetic efficiency, as surface hardening techniques like quenching are not applicable to non-magnetic materials used for magnetic efficiency enhancement.
Innovation Solution
A magnetic lock device with a surface-hardened first member and a non-magnetic second member, where the first member is supported by a bearing and the second member is made of non-magnetic material, allowing for improved durability and magnetic efficiency by preventing deformation and magnetic flux leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the movable element is made of non-magnetic material to improve magnetic efficiency, then magnetic efficiency is improved, but surface hardening treatment cannot be performed reducing strength
Solution Approach 1:
The movement restricting member is divided into two separate members: a first member that contacts the moving member and undergoes surface hardening, and a second member made of non-magnetic material that maintains magnetic efficiency. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The first member is specifically surface-hardened at the contact surface that abuts against the moving member, providing localized high strength where needed, while the second member maintains non-magnetic properties throughout for optimal magnetic efficiency. Each part has differentiated properties suited to its functional requirements.
2Strength
If surface hardening is applied to improve strength, then strength is improved, but magnetic efficiency deteriorates due to magnetic flux leakage
Solution Approach 1:
The movement restricting member is segmented into a first member for mechanical strength and a second member for magnetic efficiency. The first member undergoes surface hardening to resist deformation, while the second member's non-magnetic material prevents magnetic flux leakage, allowing both strength and magnetic efficiency to be optimized separately.
Solution Approach 2:
Surface hardening is applied locally to the first member's contact surface where mechanical strength is required, while the second member maintains uniform non-magnetic properties throughout to prevent magnetic flux leakage. This localized differentiation of material properties resolves the contradiction between strength enhancement and magnetic efficiency.
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 solution enhances the durability of the magnetic lock device and improves its magnetic efficiency by suppressing deformation and preventing magnetic flux leakage, allowing for effective movement restriction using magnetic forces.
Implementation Method 1
a plunger (31) that is made of a magnetic material and reciprocates in the second direction, and an attracting portion (331) attracting the plunger (31) toward the moving member using a magnetic force and locking the plunger (31)
Implementation Method 2
a bearing (29) slidably supporting the movement restricting member
Data Source
AI summary
A magnetic lock device includes a lock shaft having an abutting portion capable of abutting against a roller of a piston rod of a hydraulic pressure actuator, a transfer shaft configured separately from the lock shaft, the transfer shaft abutting against an end surface of the lock shaft, and a magnetic portion locking (restricting movement to the right side in the drawing) the lock shaft, the transfer shaft, and a plunger by attracting the plunger toward an attracting portion using a magnetic force. The lock shaft is surface-hardened to have a higher hardness and the transfer shaft is made of non-magnetic material.