Crankcase Ventilation Shielding Plate to Suppress Oil Mist
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Solution Overview
Problem
The introduction of air into the crankcase for ventilation in engines can stir engine oil, leading to the formation of air bubbles and oil mist, which increases oil consumption and poses challenges in hydrogen engines due to the presence of combustible hydrogen in blow-by gas.
Innovation Solution
A ventilation system with a shielding plate positioned above the liquid surface of the engine oil and a one-way valve attached to the crankcase to direct air flow away from the oil surface, combined with a baffle plate to minimize oil agitation and atomization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air is introduced into the crankcase for ventilation, then blow-by gas is vented from the crankcase, but engine oil is stirred and atomized into mist which increases oil consumption
Solution Approach 1:
A shielding plate is introduced as an intermediary component between the air introduction passage and the engine oil. The shielding plate includes a dividing wall that blocks the direct path of air flow to the oil surface, allowing ventilation to occur while preventing oil agitation and atomization.
2Reliability
If air is introduced into the crankcase for ventilation, then blow-by gas is vented from the crankcase, but air bubbles mix into the engine oil forming an emulsion
Solution Approach 1:
The shielding plate acts as a mediator that separates the air flow path from the engine oil. The dividing wall structure prevents air bubbles from directly contacting and mixing with the oil, thereby maintaining oil composition stability while enabling ventilation function.
3Reliability
If air is introduced into the crankcase for ventilation, then blow-by gas is vented from the crankcase, but the introduced air is blown onto the liquid surface of the engine oil
Solution Approach 1:
The shielding plate with its dividing wall structure serves as a physical barrier that intercepts and redirects air flow before it can reach the oil surface. This eliminates harmful oil agitation and atomization while preserving the ventilation function.
Solution Approach 2:
The shielding plate introduces a spatial dimension (physical barrier) between the air flow path and the oil surface. By adding this dimensional element, the air is redirected along a different path that does not intersect with the oil, eliminating harmful interactions.
Data Source
AI summary
In an engine that ventilates a crankcase by introducing air from an opening through a one-way valve, a shielding plate is set proximate to the opening inside the crankcase. The shielding plate includes a dividing wall located upward from a liquid surface of engine oil and downward from the opening.