Engine Breather Device Double Oil Separation Supercharger

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Solution Overview

Problem

Conventional engine breather devices fail to provide the required oil-separation function when a supercharger is used, as the blow-by gas flow increases, leading to inadequate separation of oil mist from the air-intake route.

Innovation Solution

The breather device incorporates a diaphragm valve and additional breather passages that allow blow-by gas to float and condense on specific surfaces, enabling double oil separation within the breather chamber and a front-stage breather chamber, ensuring effective oil mist separation even when connected to a supercharger.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the conventional breather device structure is used with a supercharger, then the air-intake port is connected to the breather pipe, but the oil-separation function becomes insufficient due to increased blow-by gas flow

Engineering Contradiction:

Improveadaptability to superchargerVSAvoidoil-separation function

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The breather chamber is divided into two separate chambers: a first breather chamber and a second breather chamber. Each chamber performs oil separation independently, with the first chamber separating oil from blow-by gas initially, and the second chamber providing additional separation before the gas exits to the supercharger. This segmentation ensures sufficient oil-separation function even with increased gas flow from supercharger operation.

Inventive Principle:

Principle #1Segmentation

2Productivity

If the blow-by gas flow increases when connected to supercharger, then more gas passes through the breather chamber, but the oil mist cannot be adequately separated

Engineering Contradiction:

Improveblow-by gas processing capacityVSAvoidoil-separation efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces a vertical dimension to oil separation by providing multiple breather chambers stacked vertically (first breather chamber below, second breather chamber above). This multi-level arrangement increases the separation path length and provides multiple separation stages, enabling adequate oil separation even when large volumes of blow-by gas flow through the system to the supercharger.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of operation

If the diaphragm valve is positioned without proper sealing surface, then the valve can move freely, but oil mist flows directly to the air-intake route without separation

Engineering Contradiction:

Improvevalve movementVSAvoidoil-separation function

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

A valve seat is introduced as an intermediary component between the diaphragm valve and the breather passage. The valve seat provides a proper sealing surface for the diaphragm valve, ensuring that when the valve opens, oil mist is directed through the breather passage for separation rather than flowing directly to the air-intake route. This intermediary structure maintains both valve operability and oil-separation function.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 configuration ensures high oil-separation efficiency within both the breather chamber and the front-stage breather chamber, preventing oil entrainment and allowing the device to function effectively with both supercharged and naturally aspirated engines, while also preventing freezing during cold conditions.

Implementation Method 1

the blow-by gas which has flowed from a front-stage breather-chamber inlet (33) into a front-stage breather chamber (28) floats up around a preliminary valve-seat peripheral wall (22) and a preliminary breather-passage peripheral wall (24), thereby allowing the oil mist contained in the blow-by gas to condense on the surfaces of the preliminary valve-seat peripheral wall (22) and of the preliminary breather-passage peripheral wall (24) and then separate the oil

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 2

the blow-by gas which has flowed from a breather-chamber inlet (21) into the breather chamber (3) floats up around a valve-seat peripheral wall (14) and a breather-passage peripheral wall (19)

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Data Source

PatentUS7644706B1Breather device for an engine

Publication Date: 2010.01.12 KUBOTA CORP

AI summary

The blow-by gas that has flowed from a front-stage breather-chamber inlet (33) into a front-stage breather chamber (28) floats up around a preliminary valve-seat peripheral wall (22) and a preliminary breather-passage peripheral wall (24) and flows from a breather-chamber inlet (21) into a breather chamber (3). When a breather-chamber peripheral wall (12) is removed from a breather-chamber attaching seat (11), a diaphragm valve (16) is attached to the breather-chamber attaching seat (11) and has a valve face (18) seated on a preliminary valve seat (23), and a plug (27) is taken out of a preliminary breather outlet (25), from which a breather pipe (5) is led out, thereby enabling the front-stage breather chamber (28) to be used for a single-stage breather chamber provided with the diaphragm valve (16).