Locking Mechanism Cover for Fluid Vibration Damping Device
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Solution Overview
Problem
Fluid filled vibration damping devices face issues with the break-off of locking projections during assembly, which can lead to clogging of orifice passages and damage to flexible films, due to differences in assembly methods and rubber layer deformation.
Innovation Solution
A fluid filled vibration damping device design that includes a locking mechanism with a cover portion to support the locking projection, preventing it from falling into the fluid chamber, and uses a seal rubber layer for easy assembly and reduced production costs, without increasing the number of special parts or assembly steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a locking mechanism with locking projection and locking hole is used to temporarily fasten partition members, then ease of assembly is improved, but reliability deteriorates due to break-off of locking projection during diameter constricting process
Solution Approach 1:
The patent applies beforehand cushioning by providing a cover portion that covers the locking hole from the side opposite to the locking projection. This cover portion is designed to support and retain any locking projection that may break off during the diameter constricting process, preventing it from falling into the fluid chamber and causing harmful effects. The cover portion acts as a preventive measure that cushions against the potential failure of the locking projection.
2Reliability
If welding or bonding is used to fasten partition members together, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies the cheap short-living objects principle by using a simple mechanical locking mechanism with locking projections and locking holes instead of permanent joining methods like welding or bonding. The locking projection is designed as a simple, inexpensive component that can be easily manufactured and assembled. Even if it breaks during assembly, the cover portion retains it, and the partition members remain securely fastened to the second mounting member, making the broken locking projection functionally acceptable.
3Ease of manufacture
If diameter constricting process is applied to fasten partition member, then ease of manufacture is improved, but locking projection may break off due to rubber layer deformation
Solution Approach 1:
The patent applies the intermediary principle by introducing a cover portion as a mediator between the locking hole and the harmful effects of locking projection break-off. The cover portion covers the locking hole from the side opposite to the locking projection and provides support to retain any broken locking projection. This intermediary structure allows the diameter constricting process to proceed without causing harmful effects from locking projection failure.
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 design ensures reliable vibration damping performance by preventing locking projection break-off and clogging, while simplifying assembly and reducing production costs through stable fastening and easy handling of partition members.
Implementation Method 1
the seal rubber layer undergoes elastic deformation so as to contract in the axial direction
Implementation Method 2
vibration damping effect based on the flow action of a fluid sealed therein
Implementation Method 3
the first mounting member and the second mounting member are elastically connected by a main rubber elastic body
Data Source
AI summary
A fluid filled type vibration damping device includes a fluid chamber divided by a partition member into a pressure-receiving chamber and an equilibrium chamber. The partition member has a first and a second member axially superposed together. A locking projection is formed on one of the first member or the second member and a locking hole is formed on an other, with the locking projection being inserted through the locking hole to effect locking so as to constitute a locking mechanism for holding the first and second member in a superposed state. Outer circumferential faces of the first member and the second member held in the superposed state by the locking mechanism are fastened fitting into a second mounting member via a seal rubber layer, and the first or second member having the locking hole includes a cover portion that covers an opening of the locking hole from a side thereof to which the locking projection projects.