Low Insertion Force Contact With Silver Sulfide Solid Lubricant
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Solution Overview
Problem
Existing contact systems experience high mating forces due to friction issues, which are not effectively addressed by traditional lubricants that are messy, unstable at high temperatures, and can affect conductivity.
Innovation Solution
A low insertion force contact system featuring a spring beam with a conductive base layer, a nickel or silver coating layer, and a silver sulfide surface layer forming a solid lubricant film at the mating interface, reducing friction and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a lubricant is applied to reduce mating forces, then friction is reduced, but the lubricant is messy, collects dust and debris, may affect conductivity, may be wiped away after mating, and is unstable at high temperatures
Solution Approach 1:
The patent changes the physical state of the lubricant from liquid to solid by forming a silver sulfide surface layer through chemical reaction. This solid lubricant film provides stable friction reduction without the drawbacks of liquid lubricants such as messiness, dust collection, and temperature instability. The silver sulfide layer maintains its lubricating properties across a wide temperature range and does not affect electrical conductivity.
Solution Approach 2:
The contact structure uses a composite coating system consisting of a silver coating layer and a silver sulfide surface layer. The silver base layer provides electrical conductivity and structural integrity, while the silver sulfide surface layer provides solid lubrication. This composite structure combines the beneficial properties of both materials to achieve low mating force with maintained conductivity and stability.
2Force
If friction is reduced through lubrication, then mating force is lowered, but the lubricant may be wiped away after mating making re-mating difficult
Solution Approach 1:
The silver sulfide surface layer is formed in advance on the contact surface through a chemical reaction between silver and sulfur-containing compounds. This preliminary formation of the solid lubricant layer ensures that the low-friction surface is already present before mating occurs, eliminating the need for application during or after assembly. The layer is designed to be durable and resistant to being wiped away during mating cycles.
Solution Approach 2:
The silver sulfide surface layer is designed to be sacrificial, meaning it can wear away gradually during mating cycles while continuously providing lubrication. Once depleted, the layer can be regenerated through exposure to sulfur-containing compounds, allowing the contact to be restored to its low-friction state without replacing the entire contact component.
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 silver sulfide surface layer significantly lowers the mating force while maintaining conductivity and durability, allowing for efficient and reliable electrical connections across multiple mating cycles.
Implementation Method 1
A silver sulfide surface layer forms a solid lubricant directly on the silver coating layer. The silver sulfide surface layer forms a film having a controlled thickness at the mating interface.
Implementation Method 2
The spring beam includes a conductive base layer extending to the mating interface. A silver coating layer is provided on the conductive base layer. The silver coating layer is provided at the mating interface.
Data Source
AI summary
A low insertion force contact includes a main body and a spring beam extending from the main body at a mating end of the low insertion force contact. The spring beam has a mating interface configured for mating electrical connection to a mating contact. The spring beam includes a conductive base layer extending to the mating interface. A silver coating layer is provided on the conductive base layer. The silver coating layer is provided at the mating interface. A silver sulfide surface layer forms a solid lubricant directly on the silver coating layer. The silver sulfide surface layer forms a film having a controlled thickness at the mating interface.