Multi-layer Gasket with Laser Welded Polymeric Coating
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Solution Overview
Problem
Multi-layered gasket assemblies for internal combustion engines often fail to provide adequate sealing during cold conditions, as the load from bolted connections is insufficient to maintain a tight seal before the engine warms up.
Innovation Solution
A multi-layer gasket assembly comprising metal gasket layers with axially aligned openings, including functional, distance, and stopper layers, where the stopper and distance layers are laser welded through a polymeric coating, such as PTFE, silicone, or Fluoroelastomer, to enhance sealing performance by providing a biasing force through embossment beads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layered steel gasket assembly relies on bolted connection load to provide sealing, then the structure is simple and manufacturing cost is low, but sealing performance in cold conditions is inadequate
Solution Approach 1:
The gasket assembly is divided into multiple functional layers including at least two functional layers with embossment beads, at least one distance layer, and at least one stopper layer. Each layer serves a specific function: functional layers provide sealing through embossment beads, distance layers maintain spacing, and stopper layers prevent over-compression. This segmentation allows the system to achieve reliable cold-weather sealing without excessive complexity.
Solution Approach 2:
The gasket assembly combines multiple materials with complementary properties: metal layers (steel or stainless steel) provide structural strength and embossment bead formation, while polymeric coatings applied to distance and stopper layers provide enhanced sealing characteristics. This composite structure enables the gasket to maintain sealing performance under cold conditions where single-material gaskets fail.
2Reliability
If additional sealing features are added to improve cold-weather sealing, then sealing performance improves, but manufacturing cost increases
Solution Approach 1:
The distance and stopper layers are pre-coated with polymeric material before assembly. This preliminary coating action ensures that the sealing surfaces are prepared in advance, allowing the embossment beads to compress the polymeric coating effectively during installation. The polymeric coating is applied to specific portions of the exterior surfaces of distance and stopper layers, optimizing sealing without requiring complete coating of all surfaces.
Solution Approach 2:
The patent replaces traditional mechanical fastening methods with laser welding to join the distance and stopper layers. This substitution provides stronger, more reliable connections between layers while simplifying the manufacturing process. The laser welding creates precise, consistent joints that are more reliable than mechanical fasteners, reducing assembly complexity and improving overall manufacturing 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 ensures a fluid-tight seal around cylinder bores at low temperatures with minimal additional cost, maintaining engine performance by preventing leakage of combustion gases and fluids.
Implementation Method 1
the polymeric coating between the distance and stopper layers provides a biasing force against the embossment beads of the functional layers to improve the seal
Implementation Method 2
melting material of the distance layer and of the stopper layer and of the polymeric coating with a laser beam and allowing the melted materials to cool to form a weld joint
Data Source
AI summary
An improved multi-layer gasket assembly is provided. The gasket assembly includes a plurality of metal gasket layers which have at least one set of axially aligned openings. The plurality of layers includes at least two functional layers, at least one distance layer and at least one stopper layer. Each of the functional layers has at least one embossment bead that is spaced radially from the openings, and the distance and stopper layers are sandwiched between the functional layers. At least one of the stopper and the distance layer has a polymeric coating applied to at least a portion of an exterior surface thereof, and the stopper and distance layers are laser welded together through the polymeric coating.