Integrated Plastic Gasket for Engine Valve Sealing
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Solution Overview
Problem
Existing gaskets for internal combustion engine valves are complex, requiring multiple components and prone to issues like excessive lubricating oil flow, reduced efficiency, and premature wear due to elasticity loss in the elastic ring, which complicates assembly and increases costs.
Innovation Solution
A gasket design featuring a single-piece support member made of plastic material with a thrust portion that integrates with the seal element through injection molding, eliminating the need for additional elastic rings and simplifying the assembly process by forming a dynamic seal directly with the valve stem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-component gasket design with elastic ring is used, then dynamic seal and lubricating oil flow control are achieved, but device complexity increases and reliability decreases due to elasticity loss over time
Solution Approach 1:
The patent combines the support member and seal element into a single integrated gasket component. The support member includes a body portion that directly forms the seal element, eliminating the need for separate elastic rings and multiple components. This integration resolves the technical contradiction by reducing device complexity while maintaining sealing functionality and improving reliability through elimination of components prone to elasticity loss.
Solution Approach 2:
The support member is designed to perform multiple functions simultaneously: it provides structural support, creates the dynamic seal, and controls lubricating oil flow. The body portion of the support member directly forms the seal element that contacts the valve stem, eliminating the need for separate dedicated seal components. This multi-functionality approach reduces overall gasket complexity while maintaining all necessary functions.
2Device complexity
If a single-piece support member with integrated seal element is used, then device complexity is reduced and reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces traditional mechanical assembly of multiple gasket components with a single injection molding process. The support member and seal element are formed as one integrated piece through injection molding, where the body portion directly forms the seal element. This substitution of mechanical assembly with molding process resolves the technical contradiction by reducing device complexity while the molding process inherently provides the necessary precision for the integrated structure.
3Reliability
If elastic ring is used to generate radial pressure, then dynamic seal is achieved, but loss of substance occurs due to excessive lubricating oil flow when elasticity is lost
Solution Approach 1:
The patent eliminates the elastic ring component that is prone to losing elasticity over time. Instead, the support member is designed with a geometry that inherently maintains the necessary radial pressure on the valve stem without relying on elastic deformation. The body portion directly contacts the valve stem and maintains sealing pressure through its structural design rather than through an elastic material that degrades. This resolves the technical contradiction by preventing the chain reaction of elasticity loss leading to excessive oil flow.
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 component complexity, enhances reliability, and maintains effective sealing performance while minimizing lubricating oil flow, thus improving engine efficiency and reducing wear and noise.
Implementation Method 1
an elastically deformable seal element (12), having an annular shape with respect to an axis (A) and adapted to be arranged externally on the valve (2)
Implementation Method 2
a support member (13) having an annular shape with respect to axis (A) and cooperating coaxially with the seal element (12) to press this latter, in a radial direction with respect to the axis (A), on the guide element (7) and on the stem (8) of the valve (2)
Data Source
AI summary
There is described a gasket for a valve of an internal combustion engine; this gasket has a central axis and comprises: an elastically deformable annular seal element; a support member made of plastic material, also annular and having at least a retention portion coupled coaxially on a first portion of the seal element to press it on a guide element of the valve; and elastic means acting on a second portion of the seal element to press it on a stem of the valve; the elastic means comprise a thrust portion of the support member made in one single piece with the retention portion; the seal element is formed by means of an injection molding operation in a molding chamber containing the support member.