Hydraulic Anti-Vibration Mount Structure for Uniform Radial Modulus
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Solution Overview
Problem
Conventional anti-vibration devices experience excessive modulus increase in the radial direction where intermediate elastic bodies are arranged, leading to large loads on end elastic bodies due to twist in the axial direction, causing uneven load distribution.
Innovation Solution
The anti-vibration device incorporates a cylindrical inner attachment member with a bulge and end elastic bodies, where the intermediate elastic bodies are formed of rubber without reinforcing materials, and stopper elastic parts are used to limit load application on end elastic bodies, with liquid chambers and leak passages to manage internal pressures and provide necessary rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intermediate elastic bodies are arranged in the radial direction to provide vibration attenuation, then vibration attenuation performance is improved, but modulus increases excessively in the radial direction causing uneven load distribution
Solution Approach 1:
The patent applies different material properties to different regions: intermediate elastic bodies made of rubber material (without reinforcing bodies) are placed in the radial direction to maintain low modulus and prevent excessive stiffness, while end elastic bodies fitted in the outer cylinder are designed with appropriate modulus to handle axial loads. This local differentiation of material properties resolves the contradiction between vibration attenuation and modulus uniformity.
2Stability of the object's composition
If end elastic bodies are fitted in the outer cylinder to provide structural support, then structural stability is improved, but large loads concentrate on these bodies due to twist in the axial direction
Solution Approach 1:
The patent changes the material parameter (modulus) of intermediate elastic bodies by excluding reinforcing bodies, thereby reducing radial stiffness and preventing load concentration on end elastic bodies. This parameter modification allows the end elastic bodies to maintain structural stability while experiencing reduced and more evenly distributed loads.
3Area of stationary object
If reinforcing bodies are embedded in intermediate elastic bodies to increase rigidity, then rigidity is improved, but modulus increases excessively in the radial direction
Solution Approach 1:
The patent extracts (removes) reinforcing bodies from the intermediate elastic bodies, using only rubber material for these components. This extraction prevents excessive modulus increase in the radial direction while maintaining sufficient rigidity through the rubber material's inherent properties and the elastic body geometry.
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 inhibits excessive modulus increase in the radial direction, reduces load on end elastic bodies, and provides wide frequency range attenuation performance without the need for additional valve structures, ensuring reliable liquid flow and dynamic stiffness management.
Implementation Method 1
The intermediate elastic bodies are formed of rubber material, and reinforcing bodies are embedded therein
Implementation Method 2
wide frequency range attenuation performance
Implementation Method 3
elastic bodies that elastically couple the inner attachment member and the outer cylinder
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The anti-vibration device (1) includes: an inner attachment member (11); an outer cylinder (12) that surrounds the inner attachment member; and elastic bodies (31, 32) that elastically couple the inner attachment member and the outer cylinder. The elastic bodies include: a pair of end elastic bodies (31) fitted in the outer cylinder; and a pair of intermediate elastic bodies (32) separately arranged on both sides of the inner attachment member and between the end elastic bodies. Covering members (17) that form liquid chambers (14a, 14b) between the covering members and the inner attachment member is arranged between the inner attachment member and the outer cylinder. An orifice passage that provides communication between the liquid chambers is formed between the covering members and the outer cylinder. The entire intermediate elastic bodies are formed of rubber material. The covering members surround the entire circumference of the inner attachment member from outside thereof in a radial direction and cause compressive deformation of the intermediate elastic bodies inward in the radial direction and inward in a circumferential direction.