Throttle Valve Actuator Thermal Decoupling via Low-Conductivity Coupling
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Solution Overview
Problem
Conventional servomotors used to actuate throttle valves in internal combustion engines fail to handle high thermal loads, leading to thermal issues, and high-cost solutions with enhanced thermal resistance are cumbersome.
Innovation Solution
A torque-transmitting device with a coupling element of low heat transfer capability is used between the servomotor and throttle valve, allowing for thermal decoupling, which can be achieved through material selection or geometric configurations that minimize heat transfer, such as using a sleeve or linkage with limited contact areas, and an open holder design for improved heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional servomotors are used to actuate throttle valves in high-temperature environments, then the device is simple and cost-effective, but the servomotor cannot withstand the thermal load
Solution Approach 1:
A coupling element is introduced as an intermediary component between the servomotor and throttle valve shaft. This coupling element has definedly low heat transfer capability, allowing it to transmit torque while blocking heat transfer from the high-temperature throttle valve to the servomotor, thus protecting the servomotor from thermal load
Solution Approach 2:
The torque transmission path is segmented by introducing a separate coupling element that is thermally decoupled from both the servomotor and throttle valve. This segmentation allows the system to maintain torque transmission functionality while preventing thermal coupling between components
2Reliability
If special servomotors with high thermal load capability are used, then the thermal load capability is improved, but the device becomes cumbersome and costly
Solution Approach 1:
Rather than replacing the entire servomotor with a specialized high-temperature version, a simple coupling element is used as a mediator to block heat transfer. This approach achieves the same thermal protection effect without requiring complex or expensive servomotor modifications
Solution Approach 2:
The coupling element serves as a simple, inexpensive component that provides thermal protection. It is a basic mechanical part with low heat transfer capability that can be easily manufactured and replaced if needed, avoiding the need for expensive specialized servomotors
3Reliability
If a coupling element with low heat transfer capability is used, then thermal decoupling is achieved, but the spacing between servomotor and throttle valve increases
Solution Approach 1:
The coupling element's geometry is optimized to provide sufficient thermal blocking while minimizing axial length. By changing parameters such as radial thickness, material thermal conductivity, and contact surface area, the coupling element achieves effective thermal decoupling with minimal impact on the spacing between servomotor and throttle valve
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 solution effectively reduces heat transfer between the servomotor and throttle valve, enabling efficient operation in high-temperature environments while maintaining space efficiency and cost-effectiveness.
Implementation Method 1
a torque-transmitting coupling element with a definedly low heat transfer capability
Data Source
AI summary
An apparatus for the actuation of a throttle valve, in particular a throttle valve arranged in an intake system of an internal combustion engine, uses a servomotor, in which apparatus at least one device for thermal decoupling is arranged between the throttle valve and servomotor. A shaft of the servomotor is coupled to a shaft of the throttle valve via a torque-transmitting coupling element with a definedly low heat transfer capability.