Motor Vehicle Mount Sleeve With Conical Undercut Axial Retention
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Solution Overview
Problem
Existing motor vehicle mounts with plastic outer sleeves face issues with axial migration due to relaxation of plastic materials, especially when installed in receiving eyes with draft angles, leading to potential defects in the vehicle.
Innovation Solution
A motor vehicle mount design featuring a plastics collar outer sleeve with a radially oriented collar and a conical undercut, which secures the sleeve against sliding out in both directions, thereby increasing the press-out force and preventing unintended migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cylindrical plastic sleeve is pressed into a receiving eye with draft angles, then the sleeve can be easily installed, but the press-out force decreases and axial migration risk increases
Solution Approach 1:
The invention applies asymmetry by providing different geometric features on opposite sides of the sleeve: a collar on one end for insertion guidance and a conical undercut on the other end for retention. This asymmetric design allows easy installation in one direction while providing high resistance to extraction in the opposite direction, resolving the contradiction between installation ease and press-out force.
Solution Approach 2:
The conical undercut feature utilizes curved geometric surfaces to create a wedge-shaped retention mechanism. The conical shape provides progressive engagement with the receiving eye, increasing the contact area and frictional resistance as the sleeve is inserted, thereby significantly enhancing the press-out force without compromising installation ease.
2Ease of operation
If the plastic sleeve is pressed into the receiving eye, then the mount can be assembled, but relaxation of plastic leads to preload decrease and axial migration
Solution Approach 1:
The invention applies preliminary anti-action by incorporating the conical undercut feature that proactively prevents the anticipated harmful effect of plastic relaxation and axial migration. The geometric interlock created by the conical undercut counteracts the tendency of the plastic to relax and migrate axially over time, maintaining positional stability and reliability throughout the service life of the assembly.
3Reliability
If a collar is added to prevent axial migration in one direction, then migration is prevented, but press-out force in the opposite direction becomes too small
Solution Approach 1:
The invention transitions from a one-dimensional collar design to a two-dimensional conical undercut geometry. The conical surface extends radially and axially, creating a wedge-shaped retention zone that engages with the receiving eye over a larger area. This dimensional expansion provides effective retention in both axial directions, preventing migration while maintaining high press-out force.
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 design effectively enhances the press-out force of the motor vehicle mount, preventing axial migration and ensuring the structural integrity and reliability of the mount, even under conditions of fluctuating temperatures and high loads.
Implementation Method 1
an elastomer body is arranged between the core and sleeve and is attached in an integrally bonded manner to the core and the sleeve by way of vulcanization
Implementation Method 2
If an outer sleeve made of plastic is pressed into the receiving eye, relaxation of the plastic leads to a decrease in the preload
Implementation Method 3
This risk can be prevented in one direction by a collar on the sleeve, which forms an axial form fit
Implementation Method 4
the first conical inner surface portion that corresponds to the outer contour of the plastics collar outer sleeve forms a conical undercut, with the result that the plastics collar outer sleeve is secured against sliding out
Data Source
AI summary
A motor vehicle mount includes a mount receptacle and a central longitudinal axis. The mount receptacle has a receiving eye with a first conical inner surface portion, and a plastics collar outer sleeve. The plastics collar outer sleeve may include a collar that bears, in the installed state, around the receiving eye, a core, and an elastomer body arranged between the plastics collar outer sleeve and the core. The plastics collar outer sleeve may have an outer contour substantially complementary to the first conical inner surface portion. The first conical inner surface portion may taper, from a side facing away from the collar, toward the collar. The first conical inner surface portion may form a conical undercut, and the plastics collar outer sleeve may be secured against sliding out as to the central longitudinal axis in a first direction by the collar, and in a second direction by the undercut.