Engine Intake Port Partition Wall Alignment

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Solution Overview

Problem

Conventional engines face instability in gas flow within the combustion chamber due to misalignment between the intake port and intake passage, which disrupts vortex flow generation and combustion efficiency.

Innovation Solution

A partition wall with a partition wall member extending from the intake port to the intake passage, fixed to both the intake port and passage, is used to accurately define the positional relationship between the two, reducing the step and stabilizing the gas flow by incorporating guide members and elastic support members for precise alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a partition wall is provided to separate the intake port into two channels, then the gas flow is enhanced and combustion efficiency is improved, but misalignment between the intake port and intake passage occurs causing instability in gas flow

Engineering Contradiction:

Improvecombustion efficiencyVSAvoidgas flow stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A guide member is introduced as an intermediary component between the partition wall and the intake passage. This guide member ensures accurate alignment between the intake port and intake passage by guiding the partition wall's position, thereby preventing misalignment while maintaining the dual-channel configuration for enhanced combustion efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The guide member is pre-installed on the intake passage before the partition wall is positioned. This preliminary action establishes the correct alignment reference in advance, ensuring that when the partition wall is installed, it automatically aligns with the intake passage to prevent misalignment and maintain gas flow stability.

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If the partition wall is fixed to both the intake port and intake passage, then accurate alignment is achieved, but the structural complexity increases

Engineering Contradiction:

Improvealignment accuracyVSAvoidpartition wall structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The guide member serves as a mediator that simplifies the fixation process. Instead of directly fixing the partition wall to both the intake port and passage which would require complex multi-point attachment, the guide member provides a simplified alignment reference that enables accurate positioning with fewer fixation points.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The alignment function is segmented into a separate guide member component rather than being integrated into the partition wall itself. This segmentation allows the guide member to be pre-manufactured with precise alignment features, while the partition wall can be simpler in design, reducing overall structural complexity.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11225930B2Engine

Publication Date: 2022.01.18 SUBARU CORP

AI summary

An engine includes a cylinder head, an intake manifold, and a partition wall. The cylinder head includes an intake port communicating with a combustion chamber. The intake manifold is fixed to the cylinder head and includes an intake passage communicating with the intake port. The partition wall that separates at least part of the intake port into a first channel and a second channel. The partition wall includes a partition wall member extending from the intake port to the intake passage and fixed to an inner wall of the intake port and an inner wall of the intake passage.