Exhaust Valve Wire Mesh Load Distribution
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Solution Overview
Problem
Existing exhaust valve structures fail to reliably prevent noise caused by chattering, as they do not effectively absorb the impact during chattering events, leading to insufficient noise suppression.
Innovation Solution
The exhaust valve structure incorporates a wire mesh with a diameter that gradually increases toward the downstream side, distributing the load on the valve seat portion and featuring a deformable surface portion that elastically deforms to absorb impacts, thereby reducing the load and preventing impact sounds during chattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire mesh is interposed between the valve housing and the valve to serve as a seal, then leakage of exhaust gas is prevented, but impact during chattering cannot be absorbed and noise resulting from chattering cannot be suppressed
Solution Approach 1:
The invention uses a composite structure combining wire mesh with foam material. The wire mesh provides sealing function while the foam material absorbs impact during chattering. This composite approach allows both sealing performance and noise suppression to be achieved simultaneously.
Solution Approach 2:
The foam material acts as an intermediary between the wire mesh seal and the valve element. It mediates the impact forces during chattering, absorbing the shock before it reaches the valve housing, thereby reducing noise while maintaining the sealing function of the wire mesh.
2Reliability
If the wire mesh is made thicker or more rigid to improve sealing, then leakage prevention is enhanced, but impact absorption during chattering is reduced
Solution Approach 1:
Instead of making the wire mesh thicker or more rigid, the invention combines wire mesh with foam material. The wire mesh maintains sealing performance while the foam material provides impact absorption, avoiding the need to increase wire mesh thickness which would reduce impact absorption capability.
Solution Approach 2:
The invention applies different material properties to different functional requirements: the wire mesh portion provides sealing quality while the foam material portion provides impact absorption quality. This local differentiation of material properties optimizes both sealing and noise suppression without compromising either function.
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 design effectively absorbs impacts during chattering, significantly reducing noise levels compared to traditional structures, without the need for additional weights, thus improving noise suppression and maintaining production efficiency.
Implementation Method 1
a deformable surface portion that is formed at an end in the diameter-increasing direction in which the diameter of the wire mesh increases... the deformable surface portion elastically deforms to absorb impacts
Implementation Method 2
the wire mesh is formed in a shape such that a diameter of the wire mesh gradually increases toward a downstream side of the passage and a load exerted on the valve seat portion when the valve element contacts the wire mesh is distributed in a diameter-increasing direction
Data Source
AI summary
An exhaust valve structure includes: an inner cylindrical portion that forms an introducing passage of exhaust gas and that has a stay member; a valve element that closes or opens the introducing passage; and a wire mesh that is fixed to the stay member and that contacts the valve element when the introducing passage is closed. The wire mesh is formed in a shape such that a diameter of the wire mesh gradually increases toward a downstream side of the introducing passage and a load exerted on the stay member when the valve element contacts the wire mesh is distributed in a diameter-increasing direction in which the diameter of the wire mesh increases.