PCV Valve Attachment Stability in Blow-by Gas Treating Devices
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Solution Overview
Problem
Existing blow-by gas treating devices face issues with the PCV valve separating from the oil separator due to stress, leading to deformation and hampering the function of the device, as the attachment mechanism in prior art is not robust enough to withstand vibrations and stresses applied during vehicle operation.
Innovation Solution
The design incorporates a PCV valve with a stopping portion larger than the attachment portion's inner diameter, ensuring it cannot pass through and thus remains fixed, and a flow rate regulating portion surrounded by the attachment portion to prevent deformation, combined with a configuration that limits movement and deformation of the PCV valve, ensuring it remains attached to the oil separator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the PCV valve is fixed to the oil separator by engaging the PCV valve with the tubular attachment portion, then the PCV valve can be attached to the oil separator, but the stress applied to the PCV valve may separate the PCV valve from the oil separator or deform the PCV valve
Solution Approach 1:
The PCV valve is inserted into the tubular attachment portion, creating a nested structure where the valve housing contains the flow rate regulating portion which in turn contains the valve member. This nesting provides structural support and prevents separation while maintaining ease of assembly.
Solution Approach 2:
The flow rate regulating portion acts as an intermediary element between the valve member and the tubular attachment portion. It transmits forces and provides a stable interface that prevents both separation and deformation of the PCV valve components.
2Reliability
If the PCV valve is firmly attached to prevent separation, then attachment stability is improved, but the flow rate regulating portion may be deformed by stress
Solution Approach 1:
The flow rate regulating portion is nested within the valve housing and protected by the tubular attachment portion. This nested structure shields the flow rate regulating portion from external stresses that could cause deformation, while maintaining firm attachment of the PCV valve to the oil separator.
3Adaptability or versatility
If the PCV valve is attached to the oil separator, then the blow-by gas treating function is enabled, but vibration and stress from vehicle operation may separate or deform the PCV valve
Solution Approach 1:
The nested structure of the PCV valve components provides inherent structural reinforcement that helps the assembly withstand vibrations and stresses during vehicle operation, maintaining both the attachment stability and the blow-by gas treating function.
Solution Approach 2:
The PCV valve assembly integrates multiple functions into a single unit: the valve member for flow control, the flow rate regulating portion for precision, and the tubular attachment portion for secure mounting. This merging of functions and structures improves overall reliability while maintaining adaptability.
Data Source
AI summary
A blow-by gas treating device has an oil separator. A tubular attachment portion is disposed at a discharge port of the oil separator. A PCV valve is inserted in the attachment portion. The PCV valve includes an inflow hole, a discharge hole, a flow rate regulating portion, and a stopping portion. The stopping portion is located closer to the inflow hole than to the flow rate regulating portion. The stopping portion has a dimension greater than the inner diameter of the attachment portion in a direction perpendicular to the central axis of the attachment portion. The flow rate regulating portion is surrounded by the attachment portion. The stopping portion is arranged in the space defined by the oil separator.