Valve Device Protective Element for Thermal Management
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Solution Overview
Problem
Valve devices for internal combustion engines face malfunctions under high thermal loads and sooty environments, with springs and valve rods experiencing excessive thermal stress and soiling, leading to reduced service life.
Innovation Solution
A valve device design featuring radially closed lateral surfaces forming protective elements around the spring and valve rod, which shields the spring and valve rod from exhaust gas flow, reducing thermal exposure and soiling by allowing heat dissipation through the protective elements and preventing direct contact with dirt particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the spring is exposed to exhaust gas flow for direct thermal management, then thermal response is improved, but thermal overload and soiling increase
Solution Approach 1:
The patent introduces a protective element as an intermediary component that surrounds the spring and valve rod. This mediator allows thermal energy to be managed while preventing direct contact between the spring and harmful exhaust gas particles, thus resolving the contradiction between thermal response and protection from thermal overload and soiling.
Solution Approach 2:
The protective element functions as a flexible shell that envelops the spring and valve rod. This thin-walled structure permits thermal conduction for temperature management while maintaining a barrier against soiling and excessive thermal loads, effectively addressing the technical contradiction.
2Object-affected harmful factors
If the spring is protected from exhaust gas flow, then thermal overload and soiling are reduced, but thermal management capability deteriorates
Solution Approach 1:
The protective element is designed as a thin-walled flexible shell that provides protection while maintaining thermal conduction. The thin wall structure allows heat to pass through efficiently, ensuring thermal management capability is not compromised despite the protective barrier against exhaust gas.
3Device complexity
If the valve rod and spring are directly exposed to exhaust gas, then compact design is achieved, but service life reduces due to thermal stress and soiling
Solution Approach 1:
The protective element is nested around the spring and valve rod in a concentric arrangement. This nesting approach provides protection without significantly increasing the overall device footprint, maintaining design compactness while extending service life by shielding critical components from thermal stress and soiling.
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 ensures the valve device operates reliably under high thermal loads and sooty conditions, extending its service life by preventing thermal overload and soiling, while allowing for efficient control of exhaust gas recirculation and bypass flows.
Implementation Method 1
a spring that surrounds the valve rod and is supported with its first end against the at least one valve-closing member and with its opposite end against a stop element
Implementation Method 2
the element comprises a first lateral surface and a second lateral surface which are configured to be in mutual engagement with each other. The first lateral surface is arranged to abut against the first valve-closing member and is configured to be movable therewith. The second lateral surface is arranged to abut against the stop element. A direct flow is omitted, resulting in thermal relief and reduced soiling.
Data Source
AI summary
A valve device for an internal combustion engine includes a housing with an inlet and an outlet, a passage opening which fluidically connects the inlet with the outlet, a first valve-closing member which controls the passage opening, an actuator, a valve rod on which the first valve-closing member is arranged, a stop element, a spring surrounding the valve rod, and an element. A first end of the spring is supported against the first valve-closing member, and a second end of the spring is supported against the stop element. The element substantially surrounds the spring. The element comprises a first lateral surface and a second lateral surface in mutual engagement with each other. The first lateral surface abuts against the first valve-closing member and is movable therewith. The second lateral surface abuts against the stop element. The first valve closing member moves relative to the stop element.