Actuation Device Shielding Cap Thermal Protection
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Solution Overview
Problem
Actuation shanks in exhaust-gas turbochargers are vulnerable to heat damage from high ambient temperatures, leading to potential heat conduction into the device's housing, which can cause adverse effects and contamination.
Innovation Solution
A shielding cap with interconnected cylinder portions of different diameters, featuring cooling and water outlet bores, and a twist prevention mechanism, is used to protect the actuation shank from heat and contaminants, and is fastened directly between the actuation device and the actuator bracket without additional fastening means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the actuation shank is exposed to high ambient temperatures in the engine bay, then the actuation shank can perform its function, but it suffers from heat damage and conducts heat into the housing
Solution Approach 1:
A shielding cap is introduced as an intermediary component between the actuation shank and the hot engine bay environment. The shielding cap blocks direct thermal exposure and contaminant contact with the actuation shank, while still allowing the shank to perform its actuation function. This mediator protects the sensitive actuation shank from the harsh thermal environment without compromising its operational capability.
Solution Approach 2:
The shielding cap functions as a protective shell that envelops the actuation shank. This shell structure provides thermal insulation and physical protection while maintaining a compact design that does not interfere with the actuation shank's movement or function. The shell form factor allows effective temperature protection with minimal space requirements.
2Reliability
If additional fastening means are used to secure the shielding cap, then the shielding cap can be firmly attached, but the device complexity increases
Solution Approach 1:
The shielding cap is designed to be integrally formed with the housing, merging two components into one. This integration eliminates the need for separate fastening means such as screws or clips, while still providing secure attachment. The unified structure reduces part count and assembly complexity while maintaining reliable mechanical attachment of the shielding function to the housing.
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 shielding cap effectively shields the actuation shank from elevated temperatures, prevents fouling, and ensures error-free installation, thereby enhancing the reliability and performance of the actuation device.
Implementation Method 1
The shielding cap (shielding plate) has the task of forming a heat shield for the actuation shank in order to protect the latter against elevated temperatures from the environment of the actuation device.
Data Source
AI summary
An actuation device (1), in particular electronic actuator, having a housing (2); and having an actuation shank which has a first shank portion guided in the housing (2), and which has a second shank portion (3) projecting out of the housing (2), wherein a shielding cap (4) is provided which is fastened to the housing (2) and which surrounds the second shank portion (3) with the exception of a fastening region (5).