Crankcase Vent Valve Body for Early Closure and Oil Drainage
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Solution Overview
Problem
Internal combustion engines face challenges in achieving complete sealing between the piston and cylinder wall, leading to oil-containing leakage gas bypassing the piston and entering the crankcase, which requires efficient venting solutions to prevent damage and ensure proper engine function.
Innovation Solution
A valve for crankcase ventilation devices with a valve body made of thermoplastic polyhalogen olefin, featuring a thickened envelope surface with a sealing region and a base region connected by a weakened region of reduced stiffness, allowing for axial displacement and early closure at minimal vacuums, and incorporating fluid-permeable flow openings for efficient drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve body is made rigid for stable sealing, then sealing reliability is improved, but the valve cannot close early at minimal vacuum values
Solution Approach 1:
The valve body is segmented into a rigid base region for structural stability and a flexible sealing region for responsive closure. This segmentation allows different parts of the valve body to have different mechanical properties, enabling both early closure and stable sealing.
Solution Approach 2:
Different regions of the valve body have different local qualities: the base region has high stiffness for stability, while the sealing region has reduced stiffness for flexibility. This local differentiation resolves the contradiction between rigid structure and flexible response.
2Strength
If the envelope surface is uniformly thick for structural stability, then mechanical strength is improved, but sealing flexibility and early closure are compromised
Solution Approach 1:
The envelope surface has non-uniform thickness with a thicker base region for strength and a thinner sealing region for flexibility. This local variation in thickness allows the valve body to maintain overall structural integrity while enabling the sealing region to deform easily for early closure.
Solution Approach 2:
The envelope surface is segmented into a thick base region and a thin sealing region, allowing each segment to fulfill its specific function: the thick base provides structural support while the thin sealing region provides operational flexibility.
3Ease of manufacture
If a simple valve structure is used for ease of manufacture, then manufacturing cost is reduced, but universal applicability and drainage efficiency are limited
Solution Approach 1:
The valve body design with integrated flow openings and asymmetric envelope surface serves multiple functions: sealing, early closure, and drainage. This multi-functional design allows a single valve type to be used in various crankcase ventilation applications, improving universality without significantly complicating manufacturing.
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
The valve enables universal and simple crankcase venting, ensuring early closure at low vacuums and efficient oil drainage, reducing pressure loss and preventing damage by centering and securing the valve body while allowing for flexible operation across various installation positions.
Implementation Method 1
the weakened region comprises a reduced stiffness in relation to the longitudinal direction
Implementation Method 2
a valve body holder that comprises at least one fluid-permeable flow opening
Data Source
AI summary
A valve has a valve housing with a valve seat and a valve body holder with a fluid-permeable flow opening. A valve body is arranged in the valve body holder and axially displaceable between an open state and a closed state of the valve. The valve body has an envelope surface with a sealing region for fluid-tightly contacting the valve seat in the closed state. It has a base region adjoining the sealing region in longitudinal direction. A cross section contour of the envelope surface increases monotonously from the sealing region to the base region. In the open state, an axial end of the base region contacts the valve body holder. The envelope surface has a weakened region connecting sealing region and base region to each other. The weakened region has a reduced stiffness along the longitudinal direction. The valve body is formed of a thermoplastic polyhalogen olefin.