Cylinder Head Sealing Assembly With Leakage Gas Vent Passages
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Solution Overview
Problem
Internal combustion engines face leakage of combustion gases due to sealing issues between the cylinder head and crankcase, leading to accumulated pressure and potential damage from creeping gas, which existing cylinder head gaskets fail to fully address.
Innovation Solution
Incorporating recesses and leakage gas passages within the sealing region, allowing leakage gas to be diverted from critical areas such as screw holes and casting core holes to the environment or ventilation system, thereby preventing excess pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing assembly is designed with high-strength screws to exert high pressure on the gasket, then sealing reliability is improved, but leakage gas accumulates in recesses causing damage to components
Solution Approach 1:
The patent extracts the harmful leakage gas from the sealed space by introducing leakage gas passages that lead recesses (screw holes, core holes) to the exterior or ventilation system. This allows the gas to be removed from the sealed assembly, preventing accumulation and damage while maintaining the high-pressure sealing design.
Solution Approach 2:
The leakage gas passages act as intermediary channels between the sealed combustion chamber region and the exterior/ventilation system. These passages provide a controlled pathway for leakage gas to escape, mediating between the conflicting requirements of maintaining seal integrity and preventing gas accumulation damage.
2Ease of manufacture
If recesses (screw holes, core holes) are present in the sealing region, then manufacturing and assembly are facilitated, but leakage gas accumulates in these recesses causing excess pressure
Solution Approach 1:
The patent extracts the harmful effect of recesses by providing leakage gas passages that lead these necessary manufacturing features (screw holes, core holes) to the exterior. This allows the recesses to remain for manufacturing ease while their harmful gas-trapping function is eliminated.
Solution Approach 2:
The leakage gas passages are built into the sealing assembly during manufacturing, preliminarily providing escape routes for leakage gas before it can accumulate and cause damage. This preliminary provision of gas escape paths prevents the harmful pressure buildup that would otherwise occur in the recesses.
3Ease of manufacture
If the gasket is designed as a flat gasket, then manufacturing is simple, but sealing is not 100-percent effective allowing leakage gas to escape
Solution Approach 1:
The patent converts the harmful leakage gas that escapes through the flat gasket's imperfect seal into a beneficial flow by directing it through controlled leakage gas passages. Instead of allowing random leakage that causes damage, the gas flow is harnessed and directed to safe escape routes, turning the sealing imperfection into a controlled feature.
Data Source
AI summary
The present disclosure relates to an internal combustion engine for a motor vehicle. The internal combustion engine has a cylinder head, a crankcase and a cylinder head gasket. The cylinder head, the cylinder head gasket and the crankcase form a sealing region for sealing at least one combustion chamber. A first recess is arranged within the sealing region and at a distance from the at least one combustion chamber. A first leakage gas passage extends from the first recess to a first surface exposed to the environment of the internal combustion engine or to a ventilation passage of the internal combustion engine.