Resin Electromagnetic Relay Contact Case Reinforced by Yoke
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Solution Overview
Problem
Resin contact cases in electromagnetic relays face challenges in securing strength and preventing deformation due to internal pressure increases, which is not adequately addressed by existing ceramic materials.
Innovation Solution
Incorporating a yoke fixed to the resin contact case, which can be press-fitted or insert-molded, to enhance structural integrity and limit deformation caused by pressure changes, with the yoke designed to surround or partially contact the case for comprehensive support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the contact case is made of resin to reduce manufacturing cost, then manufacturing cost is reduced, but the strength of the contact case is insufficient and deformation occurs when internal pressure rises
Solution Approach 1:
The contact case is constructed as a composite structure combining resin and metal yoke. The resin provides cost-effectiveness and electrical insulation, while the metal yoke reinforces critical areas to prevent deformation under internal pressure, achieving both cost reduction and strength enhancement
Solution Approach 2:
The contact case is divided into different material zones: resin for the main body and metal yoke for reinforcement. This segmentation allows each material to perform its optimal function - resin for cost and insulation, metal for structural strength where needed
2Strength
If the contact case is made of ceramic to ensure strength, then the strength of the contact case is improved, but manufacturing cost increases
Solution Approach 1:
Instead of using expensive ceramic throughout the entire contact case, the metal yoke is strategically placed only in areas requiring reinforcement. This local quality approach provides necessary strength where internal pressure acts while using cost-effective resin for the remaining structure
3Ease of manufacture
If the contact case is made of resin, then manufacturing cost is reduced, but deformation due to expansion occurs when internal pressure rises
Solution Approach 1:
The composite structure of resin and metal yoke combines the cost advantages of resin with the dimensional stability and pressure resistance of metal, preventing expansion and deformation under internal pressure while maintaining low manufacturing cost
Solution Approach 2:
The metal yoke is configured as a surrounding frame structure that constrains the resin contact case in multiple dimensions, preventing expansion in various directions when internal pressure increases
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 yoke significantly improves the strength of the contact case, effectively limiting deformation during expansion, even when made of resin, by providing rigid fixation and pressure resistance.
Implementation Method 1
The at least one magnet is disposed around the contact case for generating a magnetic field inside the contact case
Implementation Method 2
The at least one yoke is fixed to the contact case... deformation due to expansion of the contact case can be limited
Data Source
AI summary
The electromagnetic relay includes a fixed terminal, a movable contact piece, a drive device, a contact case, at least one magnet, and at least one yoke. The fixed terminal includes a fixed contact. The movable contact piece includes a movable contact disposed to face the fixed contact. The drive device moves the movable contact piece in a direction in which the movable contact comes into contact with the fixed contact and in a direction in which the movable contact is separated from the fixed contact. The contact case is made of resin. The contact case houses the fixed contact and the movable contact piece. The at least one magnet is disposed around the contact case for generating a magnetic field inside the contact case. The at least one yoke is fixed to the contact case.