Multi-Part Valve Body with Cooling Hollow Space
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Solution Overview
Problem
Existing valve bodies in internal combustion engines are inadequately protected against corrosion, deposits, and wear due to increasing pressures and temperatures in combustion chambers, as they are typically produced as a single piece from a uniform material.
Innovation Solution
A valve body formed in multiple parts with a hollow space for cooling, where the first valve disc part interacts with the valve seat and the second disc part faces the combustion chamber, allowing for tailored material selection based on load and incorporating a cooling medium for effective cooling and corrosion resistance, with the two parts connected by welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If valve bodies are produced as a single piece from uniform material, then manufacturing is simple and cost-effective, but corrosion resistance and wear resistance are insufficient under high pressure and temperature conditions
Solution Approach 1:
The valve body is divided into multiple separate components (valve disc, valve stem, valve seat) that can be manufactured from different materials optimized for their specific functional requirements. The valve disc facing the combustion chamber uses materials with high corrosion and wear resistance, while other parts use materials optimized for their specific loading conditions.
Solution Approach 2:
The valve body assembly combines multiple materials with different properties - such as stainless steel, heat-resistant alloys, or coated materials - to create a composite structure that provides superior corrosion resistance and wear resistance in the high-temperature combustion chamber environment while maintaining overall structural integrity.
2Reliability
If valve bodies are produced as a single piece from uniform material, then manufacturing is simple, but protection against deposits and wear is inadequate under increasing combustion chamber pressures and temperatures
Solution Approach 1:
Different regions of the valve body are made from materials with properties specifically tailored to their local operating conditions. The valve disc surface exposed to combustion gases and deposits uses materials with enhanced wear resistance and deposit resistance, while the valve stem and other components use materials optimized for their specific mechanical loading and thermal conditions.
3Power
If higher pressures and temperatures are used in combustion chambers, then engine performance increases, but corrosion and wear of valve bodies worsen
Solution Approach 1:
The material parameters of the valve body components are changed to withstand higher operating pressures and temperatures. This includes using materials with higher melting points, better thermal stability, improved corrosion resistance, and enhanced wear properties, allowing the engine to operate at elevated pressures and temperatures without suffering from increased corrosion and wear.
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 effectively reduces corrosion and wear by allowing for tailored material selection and active or passive cooling, enhancing the valve body's ability to withstand high mechanical and thermal loads, thus improving durability and performance.
Implementation Method 1
a hollow space serving at least for the cooling of the second valve disc part is formed
Implementation Method 2
the hollow space is flowed through by a cooling medium
Data Source
AI summary
A valve body for a gas exchange valve of a cylinder of an internal combustion engine can be brought to lie against a valve seat of the gas exchange valve for closing the gas exchange valve and can be removed from the valve seat to open the gas exchange valve. The valve body is formed in multiple parts and has a first valve disc part interacting with the valve seat and a second valve disc part that is connected to the first valve disc part in a fixed manner and faces a combustion chamber of the cylinder. Between the first valve disc part and the second valve disc part a hollow space serving at least for the cooling of the second valve disc part is formed.