Anti-Vibration Device with Stopper Rubber Gap
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Solution Overview
Problem
Conventional anti-vibration devices face challenges in improving anti-vibration ability and durability due to high spring constants in the radial direction and excessive deformation of main body rubbers when vibration generating and receiving bodies are relatively displaced, leading to low durability.
Innovation Solution
The anti-vibration device incorporates a pair of anti-vibration rubbers with a main body rubber and a first stopper rubber, where the first stopper rubber is fixed to the inner or outer cylinder with a gap in the radial direction to control spring constant and deformation, and a second stopper rubber is used to support the main body rubber from the outer side, enhancing durability and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the outer cylinder and inner cylinder are connected by the same main body rubber so that the main body rubber is filled between the outer cylinder and the inner cylinder, then the structural integrity is improved, but the spring constant in the radial direction is increased which deteriorates the anti-vibration ability
Solution Approach 1:
The invention divides the rubber connection into two separate components: the main body rubber that provides primary vibration isolation, and the stopper rubber that prevents excessive displacement. This segmentation allows each component to perform its specific function optimally without interfering with the other, resolving the contradiction between structural integrity and anti-vibration ability.
Solution Approach 2:
The stopper rubber acts as an intermediary element between the main body rubber and the cylinders. It provides additional structural support and constraint without directly connecting the cylinders, thereby maintaining the anti-vibration properties of the main body rubber while preventing excessive radial displacement.
2Adaptability or versatility
If the vibration generating body and vibration receiving body are relatively greatly displaced in the radial direction, then the main body rubber may be excessively compressed and deformed between the outer cylinder and the inner cylinder, but this leads to low durability of the main body rubber
Solution Approach 1:
The stopper rubber is pre-installed between the main body rubber and the cylinders to provide beforehand cushioning. When excessive radial displacement occurs, the stopper rubber compresses first to absorb the impact and prevent the main body rubber from being excessively compressed or deformed, thereby protecting the main body rubber and improving durability.
3Reliability
If a first stopper rubber is fixed to the inner or outer cylinder while keeping a gap in the radial direction, then the spring constant control is improved, but the device complexity is increased
Solution Approach 1:
The stopper rubber is positioned locally at specific locations between the main body rubber and the cylinders, rather than uniformly throughout the entire structure. This localized placement provides the necessary spring constant control and displacement limitation only where needed, minimizing the increase in device complexity while achieving the desired functional improvement.
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
This configuration improves anti-vibration ability and durability by controlling spring constant and deformation, while also reducing impact forces and accelerations, thus enhancing the overall performance of the anti-vibration device.
Implementation Method 1
a main body rubber disposed between the outer cylinder and the inner cylinder
Implementation Method 2
a first stopper rubber made of a rubber material having a hardness equal to or greater than that of the rubber material of the main body rubber is fixed to any one of an inner peripheral surface of the outer cylinder and an outer peripheral surface of the inner cylinder while keeping a gap in the radial direction
Data Source
AI summary
An anti-vibration device includes a pair of anti-vibration rubbers, each having an outer cylinder connected to any one of a vibration generating body and a vibration receiving body by means of a bracket member and provided with a first flange portion formed on an end portion of an outer side of the outer cylinder in an axial direction to protrude toward an outer side in a radial direction; an inner cylinder connected to the other of the vibration generating body and the vibration receiving body by means of a plate member and disposed at an inner side of the outer cylinder; and a main body rubber disposed between the outer cylinder and the inner cylinder, wherein the pair of anti-vibration rubbers is connected to the bracket member by interposing the bracket member between both sides of the pair of first flange portions in the axial direction so that the inner ends in the axial direction are opposite to each other, and a pair of plate members respectively disposed at outer sides of the pair of main body rubbers in the axial direction is pushed to the inner side in the axial direction by means of a coupling member passing through one pair of the inner cylinders so that the pair of anti-vibration rubbers is interposed between both sides in the axial direction by means of the plate members, and wherein a first stopper rubber made of a rubber material having a hardness equal to or greater than that of the rubber material of the main body rubber is fixed to any one of an inner peripheral surface of the outer cylinder and an outer peripheral surface of the inner cylinder while keeping a gap in the radial direction between the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder.