V-Type Engine Exhaust Sealing with Spiral Wound Gasket
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Solution Overview
Problem
Existing V-type engines with in-bank exhaust systems require complex structures due to the use of O-rings for sealing, which complicates the connecting portions between exhaust pipes and manifolds, and fails to efficiently absorb dimensional errors.
Innovation Solution
A V-type engine design utilizing a spiral wound gasket for sealing between the exhaust manifolds and pipes, which absorbs dimensional errors through elasticity, eliminating the need for insertion holes and annular grooves, and incorporating a fixing member to maintain constant distance between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If O-rings are used to seal the connecting portion between the exhaust pipe and the exhaust manifold, then sealing performance is achieved, but the structure becomes complicated due to the need for insertion holes and annular grooves
Solution Approach 1:
The patent removes the O-rings from the sealing system and extracts the insertion holes and annular grooves from the exhaust manifold structure. Instead, a flange structure with bolt holes is introduced to create a direct bolting connection between the exhaust pipe and exhaust manifold, eliminating the complex O-ring sealing mechanism while maintaining sealing performance through the flange joint.
Solution Approach 2:
The patent inverts the sealing approach by moving from a deformation-based sealing mechanism (O-rings compressed in grooves) to a rigid flange-based sealing mechanism (direct contact between flange surfaces). This inversion simplifies the structure by eliminating the need for grooves and flexible sealing elements, relying instead on the precision of the flange mating surfaces and bolt clamping force.
2Reliability
If O-rings are used for sealing, then sealing performance is maintained, but dimensional errors cannot be efficiently absorbed
Solution Approach 1:
The patent incorporates a gasket between the flange surfaces of the exhaust pipe and exhaust manifold to beforehand cushion and compensate for dimensional errors. This gasket acts as a compliant element that absorbs variations in manufacturing tolerances and thermal expansion, ensuring consistent sealing performance across different operating conditions and manufacturing batches.
3Manufacturing precision
If a floating structure is used to absorb dimensional errors, then dimensional error absorption is achieved, but the connecting structure becomes more complex
Solution Approach 1:
The patent merges the sealing function and the dimensional error absorption function into a single integrated flange-gasket-bolt assembly. This unified structure eliminates the need for separate floating connection mechanisms, achieving both sealing and dimensional compensation through a simple, straightforward bolting arrangement that is easier to manufacture and assemble.
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 achieves excellent sealing performance and dimensional error absorption while simplifying the connecting structure, improving joint strength and reducing component complexity.
Implementation Method 1
The gap between the first exhaust manifold and the first upstream end portion is sealed by the elastically deformable spiral wound gasket
Implementation Method 2
dimensional errors of the first exhaust manifold, etc., are absorbed by the elasticity of the spiral wound gasket
Data Source
AI summary
An engine includes a V-shaped cylinder body, first and second exhaust manifolds inside a V-shaped line, and an exhaust pipe. The exhaust pipe includes a first upstream end portion into which exhaust gases discharged from first cylinders to the first exhaust manifold flow, and a second upstream end portion into which exhaust gases discharged from second cylinders to the second exhaust manifold flow. A spiral wound gasket seals a gap between the first exhaust manifold and the first upstream end portion.