Crankcase Separator Wall Ejector Pump Oil Return
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Solution Overview
Problem
Existing crankcase designs for internal combustion engines face challenges in effectively ventilating blow-by gases while separating oil fractions, leading to contamination of engine peripherals and inefficient oil return due to reliance on gravity for oil separation and return.
Innovation Solution
A crankcase design incorporating a ventilation housing part and a support housing part with a separation wall and an ejector pump for oil suction, allowing for independent gravity-free oil return and compact integration of the suction arrangement and return feed path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cooler is attached in the form of a fan to condense oil fractions, then oil can be separated from blow-by gas, but the separation must occur at a position with sufficient geodetic height to enable gravity-supported return flow
Solution Approach 1:
The patent replaces the gravity-based mechanical return system with a vacuum-based suction system. The suction arrangement (ejector pump) creates a pressure difference that actively draws separated oil fractions back into the crankcase, eliminating the need for geodetic height differences and gravity-dependent flow paths.
Solution Approach 2:
The patent employs pneumatic principles by using a suction arrangement that generates a pressure differential to transport oil fractions. The ejector pump utilizes gas flow to create suction, enabling oil return through pressure-driven flow rather than gravity, thus allowing compact crankcase design without height constraints.
2Object-affected harmful factors
If a vaned wheel separation wall is used to separate oil from blow-by gas, then oil contamination of engine peripherals is prevented, but the implementation becomes more complex
Solution Approach 1:
The patent extracts the oil separation function from a complex vaned wheel structure and implements it through a simpler suction-based approach. The suction arrangement directly removes oil fractions from the blow-by gas stream without requiring complex mechanical separation walls, thereby preventing contamination while simplifying the overall device.
Solution Approach 2:
The patent replaces mechanical separation mechanisms (vaned wheels) with a pneumatic suction system. The ejector pump uses gas flow and pressure differential to separate and remove oil fractions, eliminating the need for rotating mechanical separation components and reducing overall system complexity.
3Productivity
If blow-by gas is suctioned into a forced circulation loop, then oil vapor is carried back into the cylinder, but oil fractions contaminate subsequent fans, compressors, and conveyance lines
Solution Approach 1:
The patent extracts oil fractions from the blow-by gas stream before the gas enters the forced circulation loop. The suction arrangement positioned at the separation wall actively removes oil fractions, ensuring that only cleaned gas proceeds to the circulation system, thereby preventing contamination of fans, compressors, and conveyance lines.
Solution Approach 2:
The suction arrangement acts as an intermediary between the blow-by gas stream and the forced circulation loop. It selectively removes oil fractions through suction, serving as a protective barrier that prevents contamination of subsequent engine components while allowing the ventilation function to proceed.
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
Enables efficient ventilation of blow-by gases with effective oil separation and return, preventing contamination and ensuring reliable oil reuse without gravity assistance, thus simplifying the implementation and enhancing the operational efficiency of internal combustion engines.
Implementation Method 1
A suction arrangement in the form of an ejector pump which is configured to suction out oil from the separation wall
Implementation Method 2
A suction arrangement in the form of an ejector pump which is configured to suction out oil from the separation wall
Data Source
AI summary
A crankcase for an internal combustion engine, having a suction arrangement which is assigned to the crankcase and is configured for ventilating the crankcase of blow-by gas, in particular a gas/oil mixture, to produce a limited vacuum in the crankcase is disclosed. The crankcase has at least one dividing wall which is configured to feed blow-by gas and to separate oil. A ventilating housing part and a carrier housing part which is arranged above the ventilating housing part in included in the crankcase. The dividing wall is formed between the ventilating housing part and the carrier housing part and a suction arrangement is formed in the form of a suction jet pump which is configured for extracting oil from the dividing wall.