Bimetallic Snap-Action Disc Assembly for Temperature Switches
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing temperature-dependent switches face challenges in simple and inexpensive assembly, high production costs, and the need for precise manufacturing, as well as limited testability before complete assembly, leading to potential malfunctions and increased rejects.
Innovation Solution
The bimetallic snap-action disc is captively held with play on the contact part, forming a unit with the spring snap-action disc and moving contact part, allowing for separate assembly and testing, and a connecting web is used to connect the spring snap-action disc to a transport strip for easy handling and testing, reducing production costs and improving assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switching mechanism is assembled as a complete unit inside the housing, then the structural integrity is improved, but the testability before final assembly deteriorates
Solution Approach 1:
The switching mechanism is divided into separate components (bimetallic snap-action disc, spring snap-action disc, movable contact part) that can be assembled and tested independently before final housing assembly. This segmentation allows functional testing of individual components and subassemblies, improving testability while maintaining structural integrity through controlled final assembly.
Solution Approach 2:
The switching mechanism components are pre-assembled and tested outside the housing before final installation. This preliminary action enables detection and correction of assembly errors or functional defects early in the manufacturing process, improving testability without compromising the structural integrity that is established during controlled final assembly.
2Manufacturing precision
If precise manufacturing is used for the housing and switching mechanism, then the manufacturing accuracy is improved, but the production cost increases
Solution Approach 1:
The switching mechanism is segmented into standardized components that can be manufactured separately with controlled precision requirements. By dividing the system into modular parts (bimetallic disc, spring disc, contact parts), each component can be manufactured with appropriate precision levels and assembled, reducing overall production cost while maintaining necessary manufacturing accuracy for critical interfaces.
Solution Approach 2:
The design allows for parameter optimization in manufacturing processes, such as adjusting tolerance levels for non-critical dimensions while maintaining precision for contact interfaces. This selective application of manufacturing precision reduces production costs without compromising the functional accuracy required for reliable switching operation.
3Device complexity
If the bimetallic snap-action disc is freely mounted, then the switching mechanism simplicity is improved, but the mechanical stability deteriorates
Solution Approach 1:
The bimetallic snap-action disc is combined with the spring snap-action disc and movable contact part to form an integrated switching mechanism unit. This merging provides mechanical stability through the interconnected structure while maintaining simplicity in operation, as the combined unit functions as a cohesive switching element with defined thermal and mechanical relationships between components.
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 approach enables inexpensive, reliable production with pre-assembly testing of the switching mechanism, reducing rejects and ensuring only functional units are installed, while also allowing for the use of less expensive deep-drawn parts and eliminating the need for silver-plating, thus lowering material and production costs.
Implementation Method 1
a bimetallic snap-action disc and a spring snap-action disc... wherein the bimetallic snap-action disc interacts with the spring snap-action disc in such a way that it lifts the movable contact part off from the first contact area depending on its temperature
Data Source
AI summary
A temperature-dependent switching mechanism for a temperature-dependent switch (10) having a housing (11) which accommodates the switching mechanism (25) and which comprises an upper part (14) with a first external connection (19) and a lower part (12) with a second external connection (23), wherein a first contact area (18) connected to the first external connection (19) is provided on an inner side (16) of the upper part (14) and a second contact area (22) connected to the second external connection (23) is provided on an inner side (21) of the lower part (12), comprises a bimetallic snap-action disc (31) and a spring snap-action disc (26), on which is provided a bearing region on which a movable contact part (29) is captively held, wherein the contact part (29) interacts with the first contact area (18) and the spring snap-action disc (26) interacts with the second contact area (22), and wherein the bimetallic snap-action disc (31) interacts with the spring snap-action disc (26) in such a way that it lifts the movable contact part (29) off from the first contact area (18) depending on its temperature. In this case, the bimetallic snap-action disc (31) is captively held with play on the contact part (29) (Figure 1).