Anti-Vibration Device Guide Member Shear Constraint
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Solution Overview
Problem
Existing anti-vibration devices for construction machines are inefficient in supporting engines at 4 points, leading to increased parts and assembly time, and durability issues due to shear displacement of rubber-like elastic bodies.
Innovation Solution
An anti-vibration device with an inner cylinder, outer ring, and rubber-like elastic body, where a guide member restricts displacement in the direction normal to the central axis, allowing for compact design and sufficient durability without increasing the number of parts, by guiding the inner cylinder along the central axis and absorbing vibrations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anti-vibration device for vertical support is increased in size, then durability is improved by preventing cracks in the rubber-like elastic body, but the device becomes less compact and occupies more space
Solution Approach 1:
A guide member is introduced as an intermediary component between the inner cylinder and outer ring. This guide member restricts shear displacement of the rubber-like elastic body, preventing cracks and improving durability without requiring the anti-vibration device itself to be larger. The guide member acts as a mediator that protects the rubber component from excessive deformation.
Solution Approach 2:
The anti-vibration device is segmented into distinct functional components: the inner cylinder, rubber-like elastic body, outer ring, and guide member. Each component performs a specific function, with the guide member specifically tasked with limiting shear displacement. This segmentation allows the rubber-like elastic body to be optimized for vibration isolation while the guide member handles the constraint function, improving overall efficiency and durability without increasing total device volume.
2Reliability
If 6-point support is used to improve durability and reduce shear displacement, then reliability is improved, but the number of parts increases and assembly time increases
Solution Approach 1:
The guide member serves multiple functions simultaneously: it guides the inner cylinder along the central axis, restricts shear displacement of the rubber-like elastic body, and prevents cracking. By consolidating these functions into a single component rather than requiring multiple separate support points, the design achieves improved durability while maintaining a simple 4-point support structure.
Solution Approach 2:
The function of restricting shear displacement and guiding the inner cylinder is extracted from the support points themselves and embodied in a dedicated guide member. This allows the support points to focus on bearing loads while the guide member handles the constraint function, achieving improved reliability without increasing the number of support points or parts.
3Reliability
If the guide member restricts displacement in the direction normal to the central axis, then durability is improved by preventing damage to the rubber-like elastic body, but the device complexity increases
Solution Approach 1:
The guide member is designed with a simple cylindrical structure that provides guidance and constraint through its geometry rather than complex mechanisms. This simple structural form effectively restricts shear displacement and prevents rubber-like elastic body damage while adding minimal complexity to the overall device.
Solution Approach 2:
The guide member's cylindrical geometry inherently provides the guidance and constraint functions through its shape alone, without requiring additional active control systems or complex mechanisms. The structure serves itself by using its own form to restrict displacement and protect the rubber-like elastic body, achieving improved durability with minimal added complexity.
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 prevents damage to the rubber-like elastic body, reduces the number of parts and assembly time, and enhances durability by effectively suppressing engine vibrations while maintaining compactness.
Implementation Method 1
an anti-vibration device having a rubber-like elastic body to suppress the vibration generated by the engine itself
Implementation Method 2
suppress the vibration of the engine caused by the vibration of a vehicular body while travelling on a rough surface and drilling operation
Implementation Method 3
a guide member is provided in the inner cylinder (4) so as to face the outer ring (6) in the radial direction and guide the inner cylinder in a direction of the central axis thereof
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
An anti-vibration device according to the present invention makes it possible to achieve compactness and sufficient durability without increasing the number of parts. To be specific, an anti-vibration member 10 is made up of an inner cylinder 4, an outer ring 6, and a rubber-like elastic body 8. The outer ring 6 is disposed outside the inner cylinder 4. The outer ring 6 is attached to a frame-side member 5. An end plate 7 is provided at an outer end portion of the inner cylinder 4. The rubber-like elastic body 8 is disposed between the inner cylinder 4, the outer ring 6, and the end plate 7. The anti-vibration rubber assembly 10 is provided on each side of the frame-side member 5. A guide member 9 is interposed between the two inner cylinders 4 and is unified therewith. The inner cylinder 4 is attached to an engine-side bracket 3. The guide member 9 faces the outer ring 6 in the radial direction and guides the inner cylinder 4 in the up-and-down direction. Damage of the rubber-like elastic body 8 due to displacement in the horizontal direction is prevented while an engine 2 is elastically supported thereby suppressing vibration.