Breather Device Oil Separation Cold Start Clogging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing breather devices for internal combustion engines fail to effectively separate oil from blow-by gas at low temperatures, leading to filter clogging and reduced emission quality.
Innovation Solution
A breather device with a breather chamber and a filter chamber adjacent to the crank chamber, where the filter chamber is positioned higher than the breather chamber to absorb heat and prevent oil clogging, and an oil return passage with a one-way valve to ensure smooth oil return, effectively separating oil from blow-by gas even in cold conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter device is provided in the breather passage to separate oil from blow-by gas, then oil separation performance is improved, but the filter clogs in cold state operation due to increased oil viscosity
Solution Approach 1:
The breather device is divided into two separate chambers: a breather chamber for initial oil separation and a filter chamber for fine filtration. This segmentation allows the filter to receive pre-treated gas with reduced oil content, decreasing clogging risk while maintaining separation effectiveness.
Solution Approach 2:
The breather chamber acts as an intermediary between the crank chamber and the filter chamber. It performs preliminary oil separation, reducing the oil load on the filter and preventing clogging during cold operation.
2Object-affected harmful factors
If thermal insulation material is wrapped around the filter device and breather passage to prevent heat dissipation, then filter clogging is prevented, but the amount of material, assembly steps, and device size increase
Solution Approach 1:
The breather chamber and filter chamber are merged into a single integrated housing structure that communicates with the crank chamber. This combination eliminates the need for separate thermal insulation on external components, as the integrated design maintains temperature through internal heat retention.
Solution Approach 2:
The integrated housing structure serves multiple functions: it houses both the breather and filter chambers, retains heat for the entire oil separation process, and eliminates the need for separate thermal insulation components.
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 breather device effectively separates oil from blow-by gas at low temperatures, preventing filter clogging and improving emission quality by ensuring the oil is returned to the breather chamber, thereby maintaining efficient operation and reducing pollutants.
Implementation Method 1
both the breather chamber and the filter chamber are formed adjacent to the crank chamber and are warmed by the heat from the crank chamber, a decrease in the temperature of the blow-by gas flowing therethrough and the oil contained in the blow-by gas is suppressed
Data Source
AI summary
In a breather device for an internal combustion engine for guiding blow-by gas generated in a crank chamber to an intake system, the breather device includes: a breather chamber formed adjacent to the crank chamber such that the breather chamber communicates with the crank chamber, the breather chamber being configured to separate oil from the blow-by gas that flows in the breather chamber from the crank chamber; a filter chamber formed adjacent to the crank chamber such that the filter chamber communicates with the breather chamber, the filter chamber accommodating a filter for separating oil from the blow-by gas that flows in the filter chamber from the breather chamber; and a breather passage that communicates the filter chamber and the intake system with each other.