Chemically Resistant Intake Manifold Inserts for Coolant Sealing
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Solution Overview
Problem
Existing intake manifolds for internal combustion engines suffer from deterioration of the innermost wall of the seal recess due to exposure to coolant fluid, leading to coolant leaks, and existing solutions either require redesigning the coolant crossover or fail to address the issue effectively.
Innovation Solution
The intake manifold is equipped with chemically resistant inserts and spacers made of materials like polyphenylene sulfide or metal alloys, which are seated in sockets and form fluid-tight seals with the engine cylinder head, preventing deterioration and coolant leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the intake manifold is made of polymer material (e.g., nylon), then manufacturing cost is reduced and ease of manufacture is improved, but the innermost wall of the seal recess deteriorates due to exposure to coolant fluid, leading to coolant leaks
Solution Approach 1:
The intake manifold is divided into two material zones: the main body is made of polymer material for ease of manufacture, while the seal recess area is made of chemically resistant material (metal or polymer) to prevent deterioration. This segmentation allows each part to be optimized for its specific function without requiring the entire manifold to be made of expensive chemically resistant material.
Solution Approach 2:
The seal recess is constructed with chemically resistant material specifically at the location where it contacts coolant fluid, while the rest of the manifold can use cheaper polymer material. This local quality approach ensures that only the critical area exposed to harmful chemicals is protected, maintaining overall reliability while controlling costs.
2Reliability
If the coolant crossover is redesigned with a flange to define the seal recess, then seal integrity is improved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The seal recess definition function is extracted from the coolant crossover and transferred to a separate insert component. This allows the coolant crossover to maintain its simple original design while the insert provides the chemically resistant seal surface. The insert can be independently manufactured and installed, reducing overall device complexity compared to redesigning the entire coolant crossover assembly.
3Reliability
If chemically resistant inserts are added to the intake manifold, then reliability is improved by preventing coolant leaks, but device complexity increases
Solution Approach 1:
The chemically resistant insert is nested within the polymer manifold body, with the insert seated in a recess or socket formed in the manifold. This nesting approach allows the insert to be integrated into the existing manifold structure without requiring complete redesign. The insert can be installed as a separate component that fits into the pre-formed recess, minimizing increases in device complexity while providing the necessary chemical resistance.
Data Source
AI summary
Intake manifolds for an internal combustion engine include a first insert configured as a port cap that has a bottom surface defining a first perimeter recess configured to receive a first sealing member, a second insert configured as a port cap that has a bottom surface defining a second perimeter recess configured to receive a second sealing member, and a main body having a first set of runners extending in a first direction therefrom and a second set of runners extending in an opposite direction therefrom. Both the first set of runners and the second set of runners each terminate at a back end with a flange that defines a socket configured to receive one of the first and second inserts, respectively. The first insert and the second insert are seated in their respective socket, and each are made of a material that is chemically resistant to coolant fluid.