Stopper Rubber Pre-Compression for Engine Mount Noise Reduction
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Solution Overview
Problem
Existing vibration damping devices for engine mounts suffer from noise issues due to the stopper rubber striking or separating from the inner bracket, caused by elastic deformation and lack of proper adhesion or urging mechanisms.
Innovation Solution
A vibration damping device with a stopper rubber that is elastically deformed to overlap the inner bracket, providing a buffering action and internal friction to prevent noise, without requiring special urging means or adhesion, by configuring the stopper rubber to abut and overlap the inner bracket in an urged state, and incorporating design features like inclined surfaces and support recesses for improved durability and load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stopper rubber is provided to project from the opening end surface of the fitting tube part and inserted between the inner bracket and outer bracket, then the approaching displacement volume of the first mounting member and second mounting member is restricted, but the stopper rubber undergoes elastic deformation in a different phase from the inner bracket causing striking noise
Solution Approach 1:
The stopper rubber is pre-compressed during assembly between the inner bracket and the end surface covering part, storing elastic energy in advance. This preliminary compression ensures the stopper rubber remains in continuous contact with the inner bracket during vibration, preventing the phase difference and striking noise that would occur without pre-compression
Solution Approach 2:
The stopper rubber is positioned and compressed beforehand to create a cushioning effect between the inner bracket and outer bracket. This pre-positioned elastic element absorbs vibration energy and prevents direct impact between components, eliminating the striking noise while maintaining the displacement restriction function
2Device complexity
If the stopper rubber extends in parallel or at an incline without adhesion to the inner bracket, then the structure is simple, but noise occurs due to separation from the closely abutting state or elastic deformation in a separated state
Solution Approach 1:
The stopper rubber is pre-compressed during assembly to establish continuous contact with the inner bracket before vibration occurs. This preliminary compression creates sufficient normal force to maintain adhesion through friction during subsequent vibration cycles, preventing separation noise without requiring additional adhesion mechanisms
Solution Approach 2:
The stopper rubber utilizes its own elastic properties to generate the compressive force needed for maintaining contact with the inner bracket. The rubber's elasticity self-generates the necessary pressure to prevent separation, eliminating the need for external urging mechanisms or adhesion materials while preventing separation noise
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 prevents noise from stopper rubber striking and separation, while enhancing durability and load-bearing capacity, maintaining a simple structure without additional components or adhesion, ensuring effective vibration damping.
Implementation Method 1
the stopper rubber is configured to be elastically deformed by fitting and mounting of the inner bracket into the fitting tube part so as to abut and overlap the inner bracket in a state urged by an elasticity of the stopper rubber itself
Implementation Method 2
providing a buffering action and internal friction to prevent noise
Data Source
AI summary
A vibration damping device including: a first mounting member including a fitting tube part opening to a side for fitting and mounting of an inner bracket; a second mounting member; a main rubber elastic body elastically connecting the first and second mounting members; and a stopper rubber provided on a portion of a circumference of the fitting tube part while projecting to the side from an opening end surface of the fitting tube part, the stopper rubber being configured to overlap the inner bracket. The stopper rubber is configured to be elastically deformed by fitting and mounting of the inner bracket into the fitting tube part so as to abut and overlap the inner bracket in a state urged by an elasticity of the stopper rubber itself.