Engine Cylinder Head Intake Port Partition Plate Design
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Solution Overview
Problem
The existing engine designs with intake ports divided by a plate member face issues with leakage of intake air from one flow passage to another, leading to weakened intake air flow due to the clearance required for the plate member, which compromises the strength of the tumble flow into the combustion chamber.
Innovation Solution
A bulkhead plate with a partition plate is installed in the cylinder head, dividing the intake port into two flow passages and featuring an auxiliary wall that fills a cutout in the bulkhead, preventing air leakage and enhancing the intake air flow by ensuring the partition plate is securely positioned between the passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a plate member is installed to divide the intake port into flow passages, then the intake air flow can be concentrated on a specific region to create tumble flow, but clearance between the plate member and intake port causes air leakage between passages
Solution Approach 1:
The partition plate is nested within the intake port structure, with its tip positioned inside the intake port and its side surface fitting against the inner wall. This nesting arrangement eliminates the need for external clearance, preventing air leakage while maintaining the tumble flow concentration effect.
Solution Approach 2:
The partition plate acts as an intermediary element between the two flow passages, physically separating them and preventing direct air leakage. By positioning the partition plate's side surface against the intake port inner wall, it serves as a mediator that blocks the leakage path while allowing the desired flow division.
2Strength
If the partition plate is extended toward the combustion chamber to concentrate air flow, then tumble flow is enhanced, but air leakage through clearance increases
Solution Approach 1:
The partition plate is nested within the intake port structure, with its tip positioned inside the intake port and its side surface fitting against the inner wall. This nesting arrangement eliminates the need for external clearance, preventing air leakage while maintaining the tumble flow concentration effect.
Solution Approach 2:
The partition plate extends in the longitudinal dimension toward the combustion chamber to concentrate air flow, while simultaneously conforming to the inner wall surface in the radial dimension to eliminate clearance. This multi-dimensional positioning resolves the contradiction between extending for flow concentration and preventing leakage.
3Strength
If the plate member is positioned close to the combustion chamber to maximize flow concentration, then tumble flow strength increases, but manufacturing precision requirements increase due to clearance constraints
Solution Approach 1:
The partition plate is nested within the intake port structure, with its tip positioned inside the intake port and its side surface fitting against the inner wall. This nesting arrangement eliminates the need for external clearance, preventing air leakage while maintaining the tumble flow concentration effect.
Solution Approach 2:
The partition plate has different positioning requirements at different locations: the tip is positioned deep inside the intake port for flow concentration, while the side surface conforms to the inner wall surface for leakage prevention. This local differentiation of positioning quality allows the plate to achieve both flow concentration and sealing without excessive overall precision requirements.
Data Source
AI summary
An engine provided with a combustion chamber includes a cylinder head in which a bulkhead is provided so as to extend toward the combustion chamber and an intake port is formed so as to bifurcate at the bulkhead, a bulkhead member that is provided with a partition plate intersecting the bulkhead and that divides the intake port into a first flow passage and a second flow passage with the partition plate provided between the first and second flow passages. The bulkhead of the cylinder head has a cutout formed and the partition plate of the bulkhead plate has an auxiliary wall that fills the cutout.