Engine Intake Port Curved Straight Segmentation

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Solution Overview

Problem

Conventional engine designs result in high hydrocarbon content in exhaust gas due to stagnation of intake air flow along the cylinder walls, leading to incomplete combustion and heat distribution issues.

Innovation Solution

The engine features a branched intake port system with curved and straight ports, where the intake air is directed along the cylinder walls, promoting swirls and reducing flow resistance, thereby enhancing fuel vaporization and flame propagation, and includes a stainless steel exhaust treatment member to burn off hydrocarbons.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the intake port is designed with conventional S-shaped curved ports, then the structure is simple, but the intake air flow stagnates along the cylinder walls causing incomplete combustion and high hydrocarbon content in exhaust gas

Engineering Contradiction:

Improveintake port structure simplicityVSAvoidhydrocarbon content in exhaust gas

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The intake port is divided into two distinct sections: curved ports for the first portion of the air path and straight ports for the second portion. This segmentation allows the air flow to first follow the curved path along the cylinder walls and then transition to straight paths, preventing stagnation while maintaining structural simplicity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first ports are designed with curved geometries that match the curvature of the cylinder walls, allowing smooth follow-through of the air flow along the walls. The second ports are straight to provide direct airflow to the combustion chambers, combining curved and straight elements to optimize flow dynamics.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Speed

If the intake air flow is directed away from the cylinder walls, then the flow path is straightforward, but heat from the high-temperature walls is not distributed across the cylinders, suppressing fuel vaporization and flame propagation

Engineering Contradiction:

Improveair flow velocityVSAvoidheat distribution across cylinders

Core Design Contradiction:

SpeedVSTemperature

Solution Approach 1:

The air flow path is segmented into two stages: first following the curved cylinder walls to absorb heat, then transitioning to straight ports for direct delivery to combustion chambers. This segmentation ensures both heat absorption and efficient fuel vaporization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the intake port have different geometries tailored to local requirements: curved ports where heat absorption and wall contact are beneficial, and straight ports where direct airflow and reduced resistance are prioritized for combustion chamber delivery.

Inventive Principle:

Principle #3Local quality

3Ease of operation

If the intake port uses long curved paths, then the air flow can follow cylinder walls, but the flow resistance increases and swirl generation is reduced

Engineering Contradiction:

Improveair flow following cylinder wallsVSAvoidflow resistance

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The intake port is divided into curved and straight sections, allowing the air flow to follow cylinder walls in the curved portion while minimizing the overall path length through the straight portion. This reduces total flow resistance while maintaining wall-following capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The curved ports are designed with optimized curvature radii and transition angles that facilitate smooth flow following of cylinder walls while generating effective swirls. The curvature is sufficient to maintain wall contact without excessive path length that would increase resistance.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 reduces hydrocarbon content in exhaust gas by improving intake air flow and swirl distribution, preventing incomplete combustion and utilizing a cost-effective stainless steel exhaust treatment to further reduce emissions.

Implementation Method 1

heat of the high-temperature wall between the cylinders is spread across the cylinders by swirls

Methodology Applied

Scientific EffectSwirl flow: Vortex Ring

Implementation Method 2

heat of the high-temperature wall between the cylinders is spread across the cylinders

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Implementation Method 3

a stainless steel exhaust treatment member to burn off hydrocarbons

Methodology Applied

Scientific EffectCombustion: Combustion

Data Source

PatentUS9784153B2Engine

Publication Date: 2017.10.10 KUBOTA CORP

AI summary

An engine capable of reducing the content of hydrocarbon in exhaust gas is provided. When viewed parallel to cylinder center axes, tangential virtual lines extending from endpoints of curved port central axes along tangent lines of the endpoints pass intake valve ports, straight port central axes extending from the endpoints of the curved port central axes are further away from a partition wall than the tangential virtual lines, and intake air bent through curved ports passes straight ports and is sucked through the intake valve ports along the wall between the cylinders.