Crankcase Oil Separator Jacketed Filter for Blow-By Explosion Risk

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Solution Overview

Problem

Existing crankcase ventilation systems in internal combustion engines do not effectively insulate, cool, or heat coalescing filters to manage blow-by gases, which can lead to un-combusted fuel and explosive gases accumulating and potentially causing explosions.

Innovation Solution

An oil separation device with an outer and inner housing forming a jacket, incorporating a coalescing filter and covers with manifolds, uses heating elements and insulation to maintain the filter at a desired temperature range, and a system that combines boost air with blow-by gases to regulate flow and prevent explosions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a coalescing filter is used to separate oil from blow-by gas, then oil separation efficiency is improved, but the filter temperature cannot be controlled and may lead to unsafe operating conditions

Engineering Contradiction:

Improveoil separation efficiencyVSAvoidfilter temperature control

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The device is divided into an inner housing containing the filter and an outer housing forming a jacket, allowing the filter to be thermally isolated from the incoming hot blow-by gas. This segmentation enables independent temperature control of the filter section.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A thermal management system with heating elements and insulation is introduced as an intermediary between the hot blow-by gas and the filter. This mediator controls the thermal environment of the filter, preventing overheating while allowing the gas to be processed.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If blow-by gas is vented directly without temperature control, then system complexity is reduced, but un-combusted fuel and explosive gases can accumulate and cause explosions

Engineering Contradiction:

Improveventilation system complexityVSAvoidexplosion risk from blow-by gas

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The temperature parameter of the blow-by gas is actively changed and controlled as it passes through the jacketed filter assembly. Heating elements and insulation modify the thermal state of the gas, preventing condensation of un-combusted fuel and maintaining safe operating conditions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The potentially harmful hot blow-by gas is converted into a beneficial thermal source that helps maintain the filter temperature within safe ranges. The thermal energy that could cause problems is instead utilized to prevent fuel condensation and explosion risks.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Temperature

If the filter is exposed to hot blow-by gas directly, then heat transfer to the filter is improved, but the filter may overheat and fail

Engineering Contradiction:

Improveheat transfer to filterVSAvoidfilter operational safety

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

Insulation material is placed between the hot blow-by gas and the filter housing beforehand to cushion against excessive heat transfer. This protective layer prevents the filter from overheating while still allowing controlled thermal management.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

The device effectively separates oil from blow-by gases, maintains filter temperature within a safe range, and reduces the risk of explosions by diluting volatile content below the explosive limit.

Implementation Method 1

a coalescing filter and covers with manifolds, uses heating elements and insulation to maintain the filter at a desired temperature range

Methodology Applied

Scientific EffectCoalescence: Coagulation

Implementation Method 2

uses heating elements and insulation to maintain the filter at a desired temperature range

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 3

The inner housing and the outer housing can form a jacket therebetween. The one or more ports can be configured for fluid communication with the jacket.

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 4

The one or more ports can be configured for fluid communication with the jacket

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 5

a system that combines boost air with blow-by gases to regulate flow and prevent explosions

Methodology Applied

Scientific EffectGas mixing and dilution: Diffusion

Data Source

PatentUS12497912B2Crankcase oil separator for internal combustion engine

Publication Date: 2025.12.16 CATERPILLAR INC

AI summary

Apparatuses, systems and methods are disclosed including apparatus for separating oil from a blow-by gas of an engine. The apparatus can include an outer housing, an inner housing, a filter, one or more ports, a first cover and a second cover. The inner housing can be positioned within the outer housing and defines an inner cavity. The inner housing and the outer housing can form a jacket therebetween. The filter configured to separate the oil from the blow-by gas positioned within the inner cavity. The one or more ports can be configured for fluid communication with the jacket. The first cover can have at least a first port therein to receive the blow-by gas or allow the blow-by gas to pass from the first cover. The second cover can have a second port therein to receive the blow-by gas or allow the blow-by gas to pass from the second cover.