PCV Valve Cover Assembly for Engine Plate Vibration Suppression
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Solution Overview
Problem
The vibration of the plate covering the PCV valve in an internal combustion engine generates noise during operation.
Innovation Solution
A configuration that includes a ventilation case with a PCV valve, a plate covering the valve, and a cover in contact with the plate, which reduces vibration and noise by increasing the resonant frequency of the plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plate is used to cover the PCV valve, then the valve is protected and secured, but the plate vibrates and generates noise
Solution Approach 1:
A cover is introduced as an intermediary element between the plate and the external environment. This cover absorbs or dampens the vibrations of the plate, preventing them from generating noise while allowing the plate to remain securely attached to the PCV valve assembly.
Solution Approach 2:
The system changes the vibrational parameters of the plate by introducing the cover, which modifies the resonant frequency or damping characteristics. This parameter change reduces the amplitude of vibrations that would otherwise generate noise, while maintaining the structural integrity and security of the PCV valve assembly.
2Object-generated harmful factors
If the plate is made rigid to reduce vibration, then noise is reduced, but the plate may crack or detach due to stress
Solution Approach 1:
The cover acts as a flexible element that can absorb vibrational energy without transmitting excessive stress to the plate. This flexible structure reduces noise by damping vibrations while preventing stress concentration that would lead to plate cracking or detachment.
Solution Approach 2:
The cover serves as a pre-installed cushioning element that absorbs vibrational energy before it can cause damage to the plate. This beforehand cushioning protects the plate from stress-induced failures while maintaining noise reduction benefits.
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 configuration effectively suppresses plate vibration and noise by enhancing the resonant frequency, ensuring the PCV valve remains securely attached and reducing noise generation.
Implementation Method 1
A cover 28 covering plate 26 and in contact with part of plate 26. The above configuration can reduce vibration of plate 26 while the internal combustion engine 100 is running. As a result, noise can be suppressed.
Data Source
AI summary
An internal combustion engine includes a blow-by gas passage. The internal combustion engine further includes a ventilation case provided at an intermediate position of the blow-by gas passage. The internal combustion engine further includes a positive crankcase ventilation (PCV) valve provided in the blow-by gas passage and attached to the ventilation case. The PCV valve regulates the amount of blow-by gas flowing through the blow-by gas passage. The internal combustion engine further a plate covering the PCV valve and attached to the ventilation case. The internal combustion engine further includes a cover covering the plate and in contact with part of the plate.