Crankcase Ventilation Oil Drain Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current engine positive crankcase ventilation systems face challenges in effectively managing blowby gases and oil separation, leading to inefficient air flow and potential oil drainage issues.
Innovation Solution
The proposed solution includes a positive crankcase ventilation system with a fresh air line and a foul air line, featuring an air-oil separator housing with an air-oil separation mechanism that separates blowby gases from oil, allowing fresh air to enter the crankcase while directing foul air to the intake assembly, and ensuring oil drains back to the crankcase without being inhibited by high air flow velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a positive crankcase ventilation system is used to manage blowby gases, then crankcase ventilation is improved, but oil drainage may be inhibited by high air flow velocities
Solution Approach 1:
The ventilation system is divided into separate functional zones: a fresh air line for air intake, a foul air line for blowby gas removal, and a housing with an air-oil separation mechanism. This segmentation allows independent optimization of air flow paths and oil drainage paths, enabling high ventilation efficiency without compromising oil drainage reliability
Solution Approach 2:
The oil separation function is extracted from the main air flow path and placed in a dedicated housing with an air-oil separation mechanism. This allows oil to be separated and drained independently from the high-velocity air stream, resolving the conflict between ventilation efficiency and oil drainage reliability
2Speed
If air flow velocity is increased to improve ventilation efficiency, then crankcase ventilation is enhanced, but oil separation and drainage become less effective
Solution Approach 1:
The air-oil separation mechanism acts as an intermediary between the high-velocity air flow and the oil drainage system. It captures oil from the air stream and directs it to the crankcase through a separate path, allowing high air flow velocities to maintain ventilation efficiency while preventing oil loss through the air outlet
Solution Approach 2:
Different regions of the system have different flow characteristics: the fresh air line and foul air line maintain high velocities for efficient ventilation, while the oil drainage path within the housing provides a low-velocity environment conducive to effective oil separation and drainage, minimizing oil loss
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 configuration enhances air flow velocity adjacent to the air-oil separation mechanism, facilitating efficient oil drainage and improved crankcase ventilation, thereby mitigating the effects of blowby gases and maintaining engine performance.
Implementation Method 1
an air-oil separation mechanism that separates blowby gases from oil
Data Source
AI summary
An engine assembly includes an engine structure, an air intake assembly and a positive crankcase ventilation system. The engine structure defines an intake port and a crankcase. Furthermore, the air intake assembly is in communication with the intake port. The positive crankcase ventilation system includes a fresh air line, a housing and a foul air line. The fresh air line is in communication with the air intake assembly and the crankcase. The housing defines an air inlet and an air outlet with the air inlet being in communication with the crankcase and partially defined by a wall extending into an inner volume of the housing. An oil separation mechanism may be located in the housing between the air inlet and the air outlet. The foul air line is in communication with the air intake assembly and the air outlet.