Elastic Bearing Frustoconical Elastomer to Prevent Axial Migration
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Solution Overview
Problem
Existing elastic bearings face challenges with axial migration of the mass relative to the mounting sleeve due to high operating vibration cycles and large-amplitude vibration events, leading to potential metallic contact or complete blocking, which compromises the absorber or decoupling effect.
Innovation Solution
The proposed elastic bearing features a mass with a mounting hole, a mounting sleeve with a radial collar section and shaft section, and an elastomer body with a diameter-widening contour that increases with longitudinal distance from the collar section. This design ensures a radial overlap with the mounting hole, preventing axial expansion and ensuring secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical interference fit is used between the elastomer layer and the mounting hole, then the mounting sleeve can be initially secured, but axial migration of the mass occurs during long-term operation due to vibration cycles and large-amplitude vibration events
Solution Approach 1:
The elastomer body is designed with a diameter-widening contour (frustoconical shape) instead of a cylindrical shape. This curvature allows the elastomer to expand radially during assembly, creating a form fit with the diameter-widening contour of the mounting hole that prevents axial migration in both axial directions, thereby maintaining fixation reliability throughout the service life
Solution Approach 2:
The invention transitions from a simple cylindrical interference fit (one-dimensional constraint) to a diameter-widening contour with radial expansion (adding radial dimension). This dimensional change creates a form fit that actively prevents axial migration by utilizing radial overlap and normal forces generated by the inclined position of the diameter expansion
2Force
If the elastomer layer is pretensioned to secure the mounting sleeve, then initial fixation is achieved, but axial migration occurs due to pretensioning forces over time
Solution Approach 1:
The frustoconical diameter-widening contour distributes the pretensioning force radially across a larger surface area. The inclined position of the diameter expansion generates a higher normal component that actively counteracts axial migration forces, preventing the elastomer from migrating axially under pretensioning loads
Solution Approach 2:
The invention changes the geometric parameters of the elastomer body from cylindrical to diameter-widening contour. This parameter change transforms the force distribution from concentrated axial pretensioning to distributed radial support with normal forces that prevent axial migration, maintaining fixation stability
3Strength
If a radial collar section is used to create an undercut, then the mounting sleeve can be mechanically secured, but axial slippage cannot be reliably prevented under high vibration loads
Solution Approach 1:
The diameter-widening contour creates a frustoconical form fit that generates radial normal forces during assembly and operation. These normal forces create friction on the elastomer body that reliably prevents axial slippage, even under high vibration loads, without requiring additional mechanical undercuts or retention features
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 diameter-widening contour of the elastomer body effectively prevents axial migration of the mounting sleeve, maintains the absorber or decoupling effect, and allows the sleeve to return to its original position after large-amplitude vibrations, ensuring durable and process-reliable fixation throughout the service life.
Implementation Method 1
a 'normal force' is generated in the friction surface to the elastomer body and/or to the mass, depending on the arrangement of the elastomer body, which prevents unintentional migration out
Implementation Method 2
the mounting sleeve can return to its original position even after large-amplitude vibration events, since the normal component due to the inclined position of the diameter expansion is higher than with a purely cylindrical interference fit
Data Source
AI summary
An elastic bearing comprising a mass having at least one mounting hole for a mounting sleeve, the mounting hole having a central longitudinal axis passing therethrough, at least one mounting sleeve having a collar section extending in the radial direction and a shaft section extending in the longitudinal direction, the mounting sleeve being fixed in the mounting hole, and an elastomeric body arranged on the outer circumferential side of the mounting sleeve. In an embodiment, the elastomer body has, in the region of the shaft section, a diameter-widening contour whose diameter increases with increasing longitudinal distance from the collar section, and the mounting hole having a diameter-widening contour which widens to the same extent as the diameter-widening contour of the elastomer body. In embodiments, the elastomer body is prestressed by the mass and the mounting sleeve at least in the radial direction.