Relay Contact Piece Segmentation for Detaching Force
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Solution Overview
Problem
The existing relay design faces challenges in maintaining operation stability due to the welding of open/close movable contacts with open/close fixed contacts, leading to insufficient detaching force, which affects the relay's performance.
Innovation Solution
The relay design incorporates a link member that presses a contact piece with a projection, allowing the first movable contact to be displaced more significantly, increasing the detaching force, and includes a wall to reduce adhesion and interference, enhancing contact stability and electric durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the open/close movable contact is welded to the open/close fixed contact, then the contact achieves reliable electrical connection, but the detaching force becomes insufficient and operation stability deteriorates
Solution Approach 1:
The contact piece is divided into a first divided piece and a second divided piece that are separated from each other. The first movable contact is attached to the first divided piece while the second movable contact is attached to the second divided piece. This segmentation allows the first movable contact to be displaced more significantly when pressed by the link member, increasing the detaching force from the first fixed contact even when welding occurs, thereby maintaining operation stability while ensuring reliable electrical connection.
2Force
If the first movable contact is located on the leading end side of the contact piece, then the detaching force is increased through larger displacement, but the contact piece structure becomes more complex
Solution Approach 1:
The contact piece is segmented into a first divided piece and a second divided piece. The first movable contact is positioned on the leading end side of the first divided piece, allowing it to achieve larger displacement when pressed by the link member, thereby increasing the detaching force. This segmentation enables the force enhancement while maintaining a relatively simple overall structure by distributing functions across separate pieces.
Solution Approach 2:
The first divided piece includes a projection that extends in the widthwise direction from the body. The contact portion is provided on this projection, positioned deviating in the widthwise direction from the first movable contact. This dimensional arrangement allows the link member to press the contact portion at a distance from the movable contact, creating a lever arm effect that amplifies the detaching force without requiring complex mechanical structures.
Data Source
AI summary
At the time of contact between the contacts, the first movable contact comes into contact with the first fixed contact before contact between the second movable contact and the second fixed contact is made. The first movable contact is located on a leading end side of the contact piece with respect to the second movable contact. The first divided piece includes a body and a projection. The body extends in the lengthwise direction. The projection projects in the widthwise direction of the first divided piece from the body. The projection includes a contact portion pressed by the link member.