Externally Mounted Exhaust Valve With Spring Damping for Flutter Control

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Solution Overview

Problem

Traditional passive exhaust valves in vehicle systems face challenges with vibration-related noise and excessive valve flutter due to flowrate fluctuations, leading to resonance issues and packaging difficulties.

Innovation Solution

A valve assembly design featuring a rotatable valve flap with a spring mechanism that adjusts torque requirements and includes a heat shield and spring damper to minimize backpressure and vibration, allowing the valve to efficiently switch between restricted and less restricted flow positions while reducing noise and vibration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a passive valve design is used to reduce cost, then expense is reduced, but vibration-related noise and excessive valve flutter occur

Engineering Contradiction:

Improvevalve stabilityVSAvoidvibration noise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The valve assembly is segmented into distinct functional components: a valve body, a flap valve, a spring mechanism, and a damping element. This segmentation allows each component to be optimized independently - the damping element specifically addresses vibration noise while the spring-flap mechanism provides passive cost-effective operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A damping element is introduced as an intermediary component between the valve flap and the housing. This intermediary absorbs and dissipates vibrational energy, preventing the transmission of vibration-related noise and excessive valve flutter to the surrounding structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Extent of automation

If a spring mechanism is used to bias the valve, then passive operation is achieved, but torque requirements and packaging difficulty increase

Engineering Contradiction:

Improvepassive valve operationVSAvoidpackaging difficulty

Core Design Contradiction:

Extent of automationVSDevice complexity

Solution Approach 1:

The spring mechanism is positioned in a radial direction perpendicular to the axial flow direction, utilizing the radial space within the valve housing. This dimensional repositioning allows the spring to provide necessary biasing force without interfering with the axial flow path, effectively resolving packaging constraints while maintaining passive operation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The valve flap is designed to rotate dynamically between fully open and fully closed positions rather than requiring precise positioning. This dynamic design, combined with the spring bias, allows the valve to respond naturally to flow conditions while simplifying the mechanical packaging requirements.

Inventive Principle:

Principle #15Dynamics

3Productivity

If the valve flap is positioned to reduce backpressure, then exhaust flow efficiency is improved, but torque magnitude to maintain position increases

Engineering Contradiction:

Improveexhaust flow efficiencyVSAvoidtorque magnitude

Core Design Contradiction:

ProductivityVSForce

Solution Approach 1:

The valve flap design converts the harmful effect of exhaust gas pressure into a beneficial force. When exhaust pressure increases, it naturally pushes the flap toward the open position, reducing backpressure and improving flow efficiency. The spring mechanism merely provides the counterbalancing force needed to maintain control, rather than requiring large external torques.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 design effectively reduces torque requirements for maintaining the valve in the open position, minimizes backpressure, and dampens vibrations, thereby addressing noise and resonance issues, enhancing the packaging and performance of passive exhaust valves.

Implementation Method 1

The spring is disposed in the compartment and outside of the exhaust gas passageway. The spring urging the valve flap toward the first position.

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

Methodology Applied

Scientific EffectVibration damping: Damping

Data Source

PatentUS11371402B2Externally mounted in-line exhaust gas valve

Publication Date: 2022.06.28 TENNECO AUTOMOTIVE OPERATING COMPANY INC

AI summary

A valve assembly for an exhaust system of a vehicle. The valve assembly includes a first housing, a second housing, a valve flap and a spring. The first housing defines an inlet, an outlet, and an exhaust gas passageway in fluid communication with the inlet and the outlet. The second housing is attached to the first housing and defines a compartment. The valve flap is rotatable between a first position restricting exhaust gas flow through the exhaust gas passageway, and a second position whereat exhaust gas flow through the exhaust gas passageway is allowed. The spring is disposed in the compartment and out of the exhaust gas passageway. The spring engages the valve flap to bias the valve flap toward the first position.