Tongue-and-Groove Motor Mount for Low-Stress Elastomer Retention
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Solution Overview
Problem
Existing motor mounts experience high stresses in the elastomer body due to fixation methods using tabs or pins, leading to performance degradation and damage over time.
Innovation Solution
A motor mount design featuring elastomer legs with grooves and a framework with tongues and surfaces, ensuring retention through a form-fit and press-fit mechanism without material-fit, thereby minimizing stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tabs or pins are used to fix the elastomer legs, then the elastomer legs are securely fixed in the framework, but very high stresses occur in the leg area of the tab or pin leading to damage over service life
Solution Approach 1:
The invention extracts the harmful stress concentration by removing the tab or pin from the elastomer leg. Instead of fixing the leg through a penetrating element that creates high local stresses, the elastomer leg is designed to engage directly with the framework structure, eliminating the intermediate fixing element that causes damage.
Solution Approach 2:
Instead of using a rigid tab or pin to fix the elastomer leg, the invention inverts the approach by allowing the elastomer leg itself to provide the fixing function through its deformation and engagement with the framework. The elastomer leg's elasticity becomes the fixing mechanism rather than a separate rigid component.
2Ease of operation
If the elastomer leg is deformed to accommodate the tab or pin, then fixation is achieved, but great stresses occur that are detrimental to performance
Solution Approach 1:
The invention changes the geometric parameters of the elastomer leg by providing grooves at specific locations. These grooves allow the leg to deform in a controlled manner during engagement with the framework, distributing the deformation more evenly and reducing peak stresses that would otherwise occur during fixation.
3Ease of manufacture
If a hole is created in the elastomer leg for the fixing element, then the leg can be fixed, but stress concentrations occur that reduce durability
Solution Approach 1:
The invention extracts the harmful hole from the elastomer leg design. Instead of creating a circumferentially closed hole that concentrates stresses, the elastomer leg engages with the framework through groove-based form-fit and press-fit connections that maintain the leg's structural integrity and avoid stress concentration points.
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 reduces stress on the elastomer legs during deformation, enhancing the motor mount's durability and service life by distributing friction and load more evenly.
Implementation Method 1
the elastomer body elastically connecting said attachment member and said framework
Implementation Method 2
elastically absorb the vibrations of the motor and can thus isolate them
Implementation Method 3
when the elastomer body is deformed, friction is created between a tongue and the respective groove, which also serves to fix the respective leg
Implementation Method 4
compressing of said elastomer legs between respectively said tongues and said surfaces
Data Source
AI summary
A motor mount includes an attachment member that can be attached to a first element, a framework that can be attached to a second element, and an elastomer body attached to the attachment member and forming at least two elastomer legs, with each of the elastomer legs having at least one groove. The framework includes a recess into which the attachment member is inserted extending along a first orientation. The framework further includes a first tongue, a second tongue, at least a first surface, and at least a second surface. The elastomer legs may be retained in a form-fit and press-fit manner in the framework, which may be ensured by engaging of the tongues into the grooves and compressing of the elastomer legs between respectively the tongues and the surfaces. A motor mount assembly may include a first element and/or a second element.