Valve Gasket Rounded Edge Reduces Stress Concentration
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Solution Overview
Problem
Existing gaskets for internal combustion engine valves suffer from stress concentration and fatigue cracking due to cyclic stresses, leading to premature damage and inefficiencies in lubricating oil flow, which can cause engine performance issues and excessive wear.
Innovation Solution
A gasket design featuring a support element with a tubular configuration and an elastically deformable element, where the support element includes a third portion folded to create a rounded edge within the annular seat of the elastomeric element, reducing stress concentration and enhancing curvature radius.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the support element has a straight configuration, then the structure is simple, but stress concentration occurs in the elastomeric element leading to fatigue cracking
Solution Approach 1:
The support element is designed with a curved configuration instead of a straight one, creating a rounded edge that contacts the elastomeric element. This curvature distributes stress more evenly across the elastomeric element, preventing stress concentration and fatigue cracking while maintaining structural integrity.
2Reliability
If the gasket maintains proper seal, then lubricating oil flow is controlled, but cyclic stresses cause fatigue cracking in the elastomeric element
Solution Approach 1:
The curved support element configuration redistributes the cyclic stresses imposed on the elastomeric element during engine operation, preventing stress concentration that would lead to fatigue cracking while maintaining the seal's ability to control lubricating oil flow.
3Strength
If the rounded edge is created by folding the third portion, then stress concentration is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The support element geometry is modified by folding the third portion to create a rounded edge, changing the physical parameters of the contact surface. This folding process, while adding a manufacturing step, creates a simple geometric transformation that effectively distributes stress without requiring complex machining or specialized fabrication processes.
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 design reduces stress buildup in the elastomeric element, preventing fatigue cracking and maintaining efficient lubrication while minimizing oil flow to combustion chambers, thus improving engine performance and extending valve lifespan.
Implementation Method 1
an elastically deformable element interposed between said support element and said valve
Data Source
AI summary
A gasket for a valve in an internal combustion engine is provided with a support element having a tubular configuration according to an axis and coaxially mounted on the valve. An elastically deformable element is interposed between the support element and the valve. The support element includes a first portion elongated according to the above mentioned axis, and a second portion extending from the first portion in a direction transversal to the axis, at least partially housed in an annular seat of the elastically deformable element and having its radially outermost end connected to the first portion itself. The support element comprises a third portion extending from the radially innermost end of the second portion and folded on the second portion itself so as to generate, in the folding area, a rounded edge cooperating with the annular seat of the elastically deformable element.