Valve Unit Mechanical Coupler Thermal Decoupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing valve units for exhaust gas systems face challenges in thermal decoupling and accurate position readout due to the limited temperature range of actuators and the voluminous nature of thermal decoupling components, which are unsuitable for high-temperature exhaust gases and constrained spaces in vehicles.
Innovation Solution
A mechanical coupler with a three-part construction, featuring a planar bridge element with engagement pins and slots, providing effective thermal decoupling and accurate torque transmission while allowing for precise readout of valve positions, utilizing materials like metal, cast aluminum, or ceramic for enhanced thermal resistance and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal decoupling components are used to protect the actuator from high exhaust gas temperatures, then the actuator can withstand high temperatures, but the components become voluminous and cannot be accommodated in the limited space available in the engine compartment or chassis tunnel
Solution Approach 1:
The mechanical coupler is divided into three separate components: a first rotational member coupled to the actuator shaft, a second rotational member coupled to the valve shaft, and a bridge element connecting them. This segmentation allows each component to be compact while collectively providing the necessary thermal decoupling function, eliminating the need for bulky thermal insulation components.
Solution Approach 2:
The bridge element acts as an intermediary component that transmits torque between the first and second rotational members while providing thermal decoupling. By positioning the bridge element as a separate intermediary component rather than using bulky insulation, the design achieves temperature protection within limited space constraints.
2Temperature
If a resilient coupling member is used for thermal decoupling, then the actuator is protected from heat, but the position readout becomes inaccurate due to deformation under torque
Solution Approach 1:
The coupling is segmented into rigid rotational members and a separate bridge element, eliminating the need for a resilient material that would deform. The rigid members maintain their shape under torque while the bridge element provides thermal decoupling, ensuring accurate position readout is maintained.
Solution Approach 2:
The mechanical coupler uses composite construction with rigid rotational members (made from materials like metal, cast aluminum, or ceramic) combined with a bridge element that provides thermal decoupling. This composite approach achieves thermal protection without relying on resilient materials that would compromise measurement accuracy.
3Use of energy by moving object
If the actuator is positioned close to the exhaust gas stream for heat recovery, then thermal energy can be effectively recovered, but the actuator is exposed to very high temperatures exceeding its withstand capability
Solution Approach 1:
The mechanical coupler with its bridge element serves as an intermediary structure that enables the actuator to be positioned near the exhaust gas stream for heat recovery while protecting it from direct thermal exposure. The bridge element provides the necessary thermal barrier, allowing the actuator to operate in high-temperature environments without exceeding its temperature withstand capability.
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 solution enables efficient temperature drop over a short distance, maintaining actuator force transmission while withstanding high exhaust gas temperatures, and allows for accurate valve position sensing, even in constrained spaces, by minimizing heat conduction and maximizing cooling and radiation.
Implementation Method 1
a bridge element for transmitting a force, particularly a torque between the first rotational member and the second rotational member
Implementation Method 2
providing effective thermal decoupling and accurate torque transmission while allowing for precise readout of valve positions, utilizing materials like metal, cast aluminum, or ceramic for enhanced thermal resistance
Implementation Method 3
maximizing cooling and radiation
Data Source
AI summary
A valve unit with a valve having a valve shaft with a rotational axis. The valve unit including an actuator having an actuator shaft with a rotational axis. The valve unit includes a mechanical coupler for rotational coupling of the actuator shaft and the valve shaft. The mechanical coupler includes a rotational axis coinciding with the rotational axis of the actuator shaft and the rotational axis of the valve shaft. The valve unit includes a first rotational member coupled to the actuator shaft and a second rotational member coupled to the valve shaft. The valve unit includes a bridge element. The first and the second rotational members include slots for receiving engagement pins of the bridge element.