Crankcase Ventilation Layout With Oil Pan Partition Wall
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Solution Overview
Problem
Existing engine designs face issues with increased engine oil consumption and formation of oil mist due to air introduction for crankcase ventilation, which can mix air bubbles into the engine oil and increase oil mist carryover with blow-by gas.
Innovation Solution
The engine incorporates a partition wall that separates the crankcase into regions for oil storage and non-oil storage, with an air introduction passage that directs ventilation air away from the oil surface, using a one-way valve attached to the crankcase to manage airflow and prevent oil stirring during ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air is introduced into the crankcase for ventilation, then blow-by gas is vented from the crankcase, but engine oil is stirred and air bubbles are mixed into the engine oil forming an emulsion
Solution Approach 1:
The crankcase bottom portion is divided into a first region for oil storage and a second region for ventilation using a partition wall. This segmentation prevents introduced air from directly contacting and stirring the engine oil, thereby reducing emulsion formation and oil consumption while maintaining effective ventilation of blow-by gas
2Productivity
If air is introduced into the crankcase for ventilation, then blow-by gas is vented from the crankcase, but engine oil is atomized into mist and carried away with blow-by gas
Solution Approach 1:
The partition wall separates the crankcase into distinct regions, preventing introduced air from directly contacting the engine oil surface. This eliminates oil atomization into mist that would otherwise be carried away with the vented blow-by gas, reducing oil consumption while maintaining ventilation effectiveness
3Productivity
If air is introduced into the crankcase for ventilation, then blow-by gas is vented from the crankcase, but air bubbles are mixed into the engine oil forming an emulsion
Solution Approach 1:
The partition wall creates separate zones within the crankcase, isolating the oil storage region from the ventilation airflow. This prevents air bubbles from mixing into the engine oil and forming unstable emulsions, maintaining oil composition stability while achieving effective crankcase ventilation
Data Source
AI summary
An oil pan forms a bottom portion of a crankcase of an engine. A partition wall extends upwardly from a bottom surface of the oil pan. The partition wall partitions an inside of the oil pan into a first region in which engine oil is stored and a second region in which the engine oil is not stored. An opening of an air introduction passage is arranged in the second region. The air introduction passage guides air from an intake passage to the crankcase for ventilation.