Damping Fastener Structure for Vibration Control and Twist Stability
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Solution Overview
Problem
Existing fasteners with damping functions lack sufficient vibration damping and stability, particularly when used in applications where components do not provide necessary thickness or material stability, leading to unreliable connections and potential damage during installation.
Innovation Solution
A fastener with an elastically deformable outer sleeve and a rotationally asymmetric support sleeve, which provides positive locking and radial stabilization, preventing excessive twisting and maintaining material properties through a rotation-proof connection, ensuring effective vibration damping and torsional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an outer elastic damping sleeve is used to dampen vibrations, then vibration damping is improved, but torsional stability and resistance to excessive twisting are worsened
Solution Approach 1:
The patent employs an asymmetric cross-sectional contour for both the outer damping sleeve and the inner support sleeve. This asymmetric design enables the damping sleeve to effectively dampen vibrations while the support sleeve provides torsional stability. The asymmetric geometry allows the sleeves to interlock and work together, with the support sleeve preventing excessive twisting of the damping sleeve during installation and operation.
2Strength
If a screw connection is used to ensure firm connection, then connection strength is improved, but the requirement for component thickness and material stability increases
Solution Approach 1:
The patent divides the fastening function into two separate components: an outer damping sleeve and an inner support sleeve. This segmentation allows each sleeve to specialize in a specific function - the outer sleeve provides vibration damping while the inner sleeve ensures firm connection through its asymmetric contour that engages with the component. This division enables the fastener to work effectively with thinner components that cannot accommodate a traditional single-piece screw connection.
3Ease of manufacture
If a plastic screw blind rivet is used for quick connection, then ease of manufacture and assembly are improved, but vibration damping capability is worsened
Solution Approach 1:
The patent changes the material parameter of the outer damping sleeve to an elastomeric material, which provides vibration damping capabilities that plastic blind rivets lack. The elastomeric material can deform elastically to absorb vibrations while maintaining the quick connection advantage. This material parameter change transforms the fastener from a purely rigid plastic component to a hybrid system that combines rigid support with elastic damping.
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 fastener achieves reliable vibration damping and stability by combining positive locking with components, radial inner stabilization, and an elastically deformable outer sleeve, preventing damage during installation and maintaining material properties, thus providing a durable and effective connection.
Implementation Method 1
an elastically deformable outer sleeve (10) with a screw-in opening (11) in a first axial end portion (12) and a screw-in portion (14) for a screw in a second axial end portion (14)
Implementation Method 2
a rotationally asymmetrical support sleeve (30), which is positive-lockingly arranged against rotation relative to the outer sleeve (10) within the outer sleeve (10) in the first axial end portion (12)
Data Source
AI summary
A fastener having a damping function with which at least a first and a second component can be connected via a screw connection. The fastener consists of the following components: an elastically deformable outer sleeve, a support sleeve arranged therein and a screw sleeve with telescopic portion arranged in the outer sleeve. When establishing the connection between the components, the outer sleeve folds, whereby the support sleeve and the screw sleeve are moved into each other.