Fluid-Filled Vibration Damper Sealing With Engaging Rubber Positioning
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Solution Overview
Problem
Existing fluid-filled vibration damping devices face issues with unstable sealing performance due to displacement of the second attachment member from the cup member, leading to potential leakage and mounting difficulties during assembly.
Innovation Solution
A fluid-filled vibration damping device with a structure that includes a second attachment member press-fitted into a cup member via a press-fit rubber, featuring a sealing rubber and an engaging rubber projection that engages with a corresponding hole in the cup member, ensuring stable positioning and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second attachment member is rubber press-fitted into the cup member via the press-fit rubber, then the sealing rubber is compressed to provide sealing, but the spring back of the sealing rubber and press-fit rubber easily displaces the second attachment member in the direction of dislodgment, making it difficult to properly hold the members in position
Solution Approach 1:
The rubber layer is divided into functionally distinct regions: a sealing rubber portion for axial sealing and a press-fit rubber portion for radial press-fitting. This segmentation allows each portion to perform its specific function independently, preventing the press-fit rubber's spring back from displacing the attachment member while the sealing rubber maintains compression for sealing.
Solution Approach 2:
Different portions of the rubber layer are given different functional qualities: the sealing rubber portion is positioned to be compressed axially for sealing, while the press-fit rubber portion is positioned for radial compression during press-fitting. This local differentiation ensures that the spring back forces are localized and do not cause overall displacement.
2Reliability
If the sealing rubber is compressed between the second attachment member and the cup member to provide fluid-tight sealing, then sealing is achieved, but the spring back of the sealing rubber displaces the second attachment member, causing variation in compression allowance and unstable sealing performance
Solution Approach 1:
The rubber layer is segmented into sealing rubber and press-fit rubber portions, allowing the sealing rubber to be compressed to a predetermined extent without its spring back causing displacement. This segmentation ensures consistent compression allowance and stable sealing performance.
3Strength
If the second attachment member is rubber press-fitted into the cup member, then connection is achieved, but the press-fit rubber shear-deforms and spring back displaces the second attachment member, causing mounting difficulties
Solution Approach 1:
The rubber layer is segmented into a sealing rubber portion and a press-fit rubber portion. The press-fit rubber portion is specifically designed for radial press-fitting with controlled shear deformation, while the sealing rubber portion handles axial compression. This segmentation reduces overall spring back displacement and facilitates easier mounting.
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 device achieves reliable liquid tightness and prevents displacement of the attachment members, reducing noise and ensuring stable assembly, thereby maintaining effective sealing performance.
Implementation Method 1
the second attachment member is rubber press-fitted into the cup member via the press-fit rubber
Implementation Method 2
the sealing rubber is compressed between the second attachment member and the cup member side, whereby a fluid-tight sealing is provided
Implementation Method 3
a fluid chamber filled with a non-compressible fluid is provided inside. When vibration is input to the fluid-filled vibration damping device, the vibration damping effect based on the flow action of the fluid
Data Source
AI summary
A fluid-filled vibration damping device including a first attachment member, an annular second attachment member, a main rubber elastic body connecting the first and second attachment members, a fluid chamber filled with a non-compressible fluid, and a cup member in which the second attachment member is press-fitted via a press-fit rubber provided to an outer circumferential surface of the second attachment member. A sealing rubber is provided to a distal end surface of insertion of the second attachment member into the cup member to provide a sealing axially between the second attachment member and the cup member. An engaging rubber integrally formed with the press-fit rubber is provided to the second attachment member, and the second attachment member and the cup member are mutually positioned in an axial direction by engagement between the engaging rubber and the cup member.