Ventilation Duct Ribs for Oil-Lubricated Engine Blow-by Gas Separation
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Solution Overview
Problem
Existing oil separation devices in internal combustion engines fail to achieve complete separation of oil and particles from blow-by gas, leading to residual oil being burned, which increases emissions and oil loss, and require complex designs to achieve desired purity.
Innovation Solution
The ventilation duct in the oil-lubricated machine features a free flow cross-section with ribs or grooves on its inner wall, which impedes the flow of gas and acts as a barrier to retain separated condensate and particles, allowing them to collect and be discharged by gravity, reducing the complexity of upstream oil separation devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a labyrinth, baffle plate, separator ring or swirl generator is used as an oil separator, then the separation of oil from blow-by gas is improved, but the device complexity and structural design become more complex
Solution Approach 1:
The ventilation duct is segmented into multiple sections with ribs or grooves arranged at different angles (45° to 90° to the flow direction) to create multiple separation stages. This segmentation allows progressive separation of oil droplets from gas without requiring a single complex separator device, thereby improving separation performance while maintaining relatively simple structure
Solution Approach 2:
The invention transitions from conventional horizontal separation approaches to utilizing vertical or inclined surfaces (ribs/grooves at 45°-90° angles) within the ventilation duct. This dimensional change allows gravity to act more effectively on separated oil droplets, directing them along the inclined surfaces to collection points, achieving better separation with simpler means
2Manufacturing precision
If multiple separation principles are combined to achieve specified purity of cleaned blow-by gas, then the separation performance is improved, but the device complexity increases
Solution Approach 1:
The ventilation duct is designed to perform multiple functions simultaneously: it serves as both a gas passage and an oil separation device through the integrated ribs/grooves structure. The same structural elements that guide gas flow also facilitate oil droplet separation and collection, eliminating the need for separate, dedicated separator components and reducing overall device complexity while maintaining gas purity
3Device complexity
If a simple ventilation duct is used to discharge cleaned gas, then the device complexity is reduced, but the separation performance of particles and condensate is insufficient
Solution Approach 1:
Rather than making the entire ventilation duct complex, the invention applies local structural modifications (ribs or grooves) at specific locations and angles within the duct. These localized features create turbulence and directional flow patterns that enhance separation performance only where needed, while the rest of the duct remains simple and easy to manufacture
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 enhances the separation performance of particles and condensate, reducing the risk of oil being burned and minimizing emissions, while maintaining low flow resistance and allowing for a simpler upstream oil separation device configuration.
Implementation Method 1
acts as a barrier to retain separated condensate and particles, allowing them to collect and be discharged by gravity
Implementation Method 2
the ventilation duct has a free flow cross-section with ribs or grooves on its inner wall, which impedes the flow of gas
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to an oil-lubricated working machine, in particular a motor vehicle internal combustion engine, comprising a hollow chamber filled with an oil-containing gas and a ventilation channel (1) which is connected to the hollow chamber and is used for discharging gas from said hollow chamber, said ventilation channel (1) having a free flow cross-section (2) extending in a direction of flow (S) of the ventilation channel (1) and being arranged at an angle of between 45° and 90° relative to a horizontal plane. According to the invention, the ventilation channel (1) has, outside of said free flow cross-section (2) and on an inner wall, a plurality of ribs (3, 3') or grooves (7) arranged one after another in the direction of flow (S).