Valve Assembly Groove Design for Injection Valve Sealing
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Solution Overview
Problem
Existing injection valve assemblies face challenges in achieving precise and reliable coupling with the cylinder head of internal combustion engines, leading to potential leaks and gasket extrusion due to thermal expansion and high-pressure conditions.
Innovation Solution
A valve assembly design featuring a valve body with a circumferentially extending groove having first and second wall sections of different radii, where the second wall section is positioned axially away from the injection nozzle, ensuring a high-pressure sealing contact and accommodating thermal expansion, while a radially extending protrusion further secures the gasket in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional valve body groove design is used, then the manufacturing is simple, but the sealing reliability deteriorates due to gasket extrusion under thermal expansion and high-pressure conditions
Solution Approach 1:
The valve body groove is segmented into multiple wall sections (first wall section, second wall section, third wall section) with different radii and axial positions. This segmentation allows each section to perform a specific sealing function, preventing gasket extrusion while maintaining reliability under thermal expansion and high-pressure conditions.
Solution Approach 2:
The groove wall sections are designed with asymmetric radial dimensions, where the first wall section has a first radius, the second wall section has a second radius, and the third wall section has a third radius. This asymmetric design creates varying sealing pressures across the gasket, improving sealing reliability without requiring complex additional components.
2Stability of the object's composition
If the groove radius is increased to accommodate thermal expansion, then the gasket seating area increases, but the volume exposed to high temperatures increases leading to greater thermal expansion
Solution Approach 1:
Different wall sections of the groove are assigned different radial dimensions (first radius, second radius, third radius) based on their specific sealing requirements. The first wall section with its specific radius provides stable gasket seating in the high-temperature zone, while minimizing the overall volume of the groove exposed to high temperatures, thus reducing thermal expansion.
3Reliability
If a single-radius groove design is used, then the manufacturing precision requirement is lower, but the sealing performance deteriorates under high-pressure conditions
Solution Approach 1:
The groove is divided into multiple wall sections with different radii, where each section is optimized for specific sealing functions. This segmentation allows the use of standard manufacturing tolerances for each section while achieving superior overall sealing performance under high-pressure conditions, as each section contributes to the sealing at its optimal radius.
Data Source
AI summary
A valve assembly for an injection valve includes a valve body with a central longitudinal axis, the valve body having a valve body groove extending circumferentially around the valve body and being designed to take in a gasket, the valve body groove having a first wall section and a second wall section, the wall sections configured to be coupled to the gasket in a manner that the valve assembly is sealingly coupable with a cylinder head of a combustion engine, and an injection nozzle enabling a fluid flow through the valve assembly. The second wall section is arranged relative to the first wall section in axial direction away from the injection nozzle. The first wall section extends to a first radius and the second wall section extends to a second radius, and the first radius is bigger than the second radius.