Vibration-Decoupled Heat Shield Fastening Device
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Solution Overview
Problem
Existing fastening devices for shielding parts, such as heat shields, face challenges in noise generation under vibration stress and mechanical decoupling from fastening partners, particularly at maximum radial displacement positions, and require adaptation for various sheet metal thicknesses.
Innovation Solution
A fastening device featuring a collar sleeve with collars and a bridging element, incorporating a damping element that limits radial play and provides axial guidance, allowing for noiseless operation and decoupling in both axial and radial directions, with modular preassembly capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radial play s is increased to allow thermal expansion compensation, then the shielding part can accommodate thermal expansion better, but noise generation increases due to hard impacts between the collar sleeve and bridging element
Solution Approach 1:
A damping element is introduced between the collar sleeve and the bridging element to cushion radial impacts before they occur. This damping element absorbs impact energy and prevents direct metal-to-metal contact, thereby reducing noise generation while maintaining the necessary radial play for thermal expansion compensation.
Solution Approach 2:
The damping element acts as an intermediary component between the collar sleeve and the bridging element. It mediates the interaction during radial displacement, providing a compliant interface that reduces impact forces and noise while still allowing the required range of motion for thermal expansion accommodation.
2Stability of the object's composition
If the shielding part is rigidly fixed to the fastening partner part, then mechanical stability is improved, but vibration transmission and stress crack formation increase
Solution Approach 1:
The fastening device incorporates radial play and a damping element that allows dynamic movement in the radial direction while maintaining axial stability. This dynamic design enables the shielding part to absorb vibrations and thermal expansion forces without transmitting them directly to the fastening partner part, preventing stress crack formation while maintaining mechanical stability.
Solution Approach 2:
The fastening device is segmented into distinct functional components: the collar sleeve for axial positioning, the bridging element for radial connection, and the damping element for vibration isolation. This segmentation allows each component to perform its specific function optimally, providing both stability and vibration decoupling.
3Object-generated harmful factors
If a damping element is added to reduce noise, then noise generation is reduced, but device complexity increases
Solution Approach 1:
The damping element is designed as a flexible, elastomeric component with a simple annular or radial profile that fits between the collar sleeve and bridging element. This simple geometric form minimizes manufacturing complexity while effectively providing vibration damping and noise reduction through its inherent elastomeric properties.
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 effectively reduces noise and enhances mechanical decoupling, ensuring reliable attachment across different sheet metal thicknesses while accommodating thermal expansion and vibration, thus improving the durability and performance of shielding parts.
Implementation Method 1
a damping element (16) which is arranged in the axial direction A between the collars (8, 9) and the damping element is arranged in the radial direction R between the sleeve core (7) and a radial stop (17) of the bridging element (11)
Implementation Method 2
there is the problem that such shielding components can expand considerably when heated, and therefore it is advisable to provide a means of compensating for the thermal expansion occurring between the mounting points of the shielding component
Data Source
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AI summary
The invention relates to a fastening device for fastening a shielding part (1) to a fastening partner part (3) in a vibration-decoupled manner, having a collar sleeve (6), which has at least one sleeve core (7) and two collars (8, 9), which protrude outward in a radial direction (R) with respect to a center axis (M) of the collar sleeve (6) and are spaced apart from each other in an axial direction (A), wherein the collars (8, 9) form an intermediate space (10) between themselves in an axial direction (A), and having a bridging element (11), the radially inner region (12) of which is arranged in the intermediate space (10) and the radially outer region (13) of which can be connected to the shielding part (1), wherein the sleeve core (7) extends through a cut-out (15) of the bridging element (11) with a radial play (s) and the bridging element (11) can be moved radially relative to the sleeve core (7). A damping element (16) is present, which is arranged between the collars (8, 9) in the axial direction (A). The damping element (16) is arranged between the sleeve core (7) and a radial stop (17) of the bridging element (11) in the radial direction (R) and is dimensioned in such a way that the radial movability of the bridging element (11) relative to the sleeve core (7) is limited to an effective radial play (s') smaller than the radial play (s).