Graphite Spacer with Guard Wall for Turbocharger Valve Vibration Damping
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Solution Overview
Problem
Variable flow valve mechanisms in turbochargers experience vibrations due to pulsation pressure and engine vibrations, leading to chattering noise and reduced quietness in vehicles.
Innovation Solution
A variable flow valve mechanism with a stem, link member, attachment member, valve, and spacer, where the spacer is surrounded by a guard wall to increase friction and reduce vibrations, and made of graphite for internal damping, preventing spacer fragments from escaping and causing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve is allowed to have backlash on the attachment member to secure follow-up performance, then sealing performance is improved, but valve vibrations and chattering noise increase
Solution Approach 1:
A spacer is introduced as an intermediary component between the valve and the attachment member. This spacer absorbs vibrations through friction against the guard wall and internal damping, while allowing the valve to maintain its backlash for proper sealing. The spacer acts as a vibration-dampening mediator that decouples the vibration transmission path while preserving the functional backlash.
Solution Approach 2:
The spacer is made of graphite material which provides internal damping properties. This composite material approach combines the structural function of the spacer with vibration damping characteristics, reducing valve vibrations and chattering noise while maintaining the necessary mechanical clearances for sealing.
2Ease of manufacture
If the valve structure is simplified to reduce complexity, then ease of manufacture is improved, but vibration damping capability is reduced
Solution Approach 1:
The valve assembly is segmented into distinct functional components: the valve body, the attachment member, and the spacer. This segmentation allows each component to be optimized independently - the valve for sealing, the attachment member for mounting, and the spacer for vibration damping - while maintaining ease of assembly through a modular structure.
Solution Approach 2:
The spacer serves as a vibration-dampening intermediary that is easily manufactured and installed. It provides the necessary damping function without complicating the overall assembly process, as it simply fits between the valve and attachment member with guard walls to provide friction-based damping.
3Object-generated harmful factors
If the spacer is made of graphite material for internal damping, then vibration reduction is improved, but risk of fragment escape and downstream damage increases
Solution Approach 1:
The guard wall structure is designed beforehand to contain any potential graphite fragments from the spacer. This protective structure is built into the attachment member or valve body, creating a containment zone that prevents fragments from escaping into the exhaust system while allowing the graphite spacer to perform its vibration damping function.
Solution Approach 2:
The guard wall acts as an intermediary containment structure between the graphite spacer and the downstream exhaust system components. It provides a physical barrier that captures any fragments while allowing the spacer to vibrate and dampen valve vibrations effectively.
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
Significantly reduces valve vibrations and chattering noise, ensuring a high level of quietness in vehicles and preventing damage to downstream exhaust system components.
Implementation Method 1
the spacer is surrounded by a guard wall to increase friction and reduce vibrations
Implementation Method 2
made of graphite for internal damping
Data Source
AI summary
In a waste gate valve, an annular spacer is provided between a washer and an attachment tongue in an axial direction of a valve shaft of a valve. The spacer is made of a graphite material. An annular guard wall is formed on a back surface of the washer in such a way as to surround the spacer.