Internal Stopper Anti-Vibration Device for Durability
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Solution Overview
Problem
Conventional anti-vibration devices with stopper parts on the outside of the elastic body degrade in durability when attached to members with varying force inputs, such as engines, due to excessive elastic deformation and potential contact with the main wall, leading to reduced performance over time.
Innovation Solution
The anti-vibration device incorporates a stopper part inside the first pressure-absorbing fluid chambers, which restricts excessive relative displacement in the sandwiching direction, reducing elastic deformation and maintaining performance by avoiding contact with the outer elastic body and distributing load effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stopper part is disposed on the outside of the elastic body, then the pressure-absorbing fluid chambers can expand or contract easily while reducing elastic deformation, but the stopper part contacts the main wall part of the elastic body when attached to members with large force variation, causing durability to degrade
Solution Approach 1:
The stopper part is inverted from its conventional external position to an internal position within the pressure-absorbing fluid chamber. This inversion allows the stopper to restrict excessive displacement from the inside without contacting the external main wall of the elastic body, thereby eliminating the durability issue while maintaining the displacement restriction function
Solution Approach 2:
The stopper part is nested within the pressure-absorbing fluid chamber, placing it inside the elastic body structure. This nesting arrangement allows the stopper to function internally without interfering with the external elastic body, preventing contact-related durability degradation while maintaining effective displacement control
2Duration of action of stationary object
If the stopper part restricts excessive relative displacement, then the amount of elastic deformation is reduced and performance is maintained, but the load on the elastic body increases when the stopper part is on the outside
Solution Approach 1:
By inverting the stopper part's position to the inside of the pressure-absorbing fluid chamber, the load path is changed. The stopper now restricts displacement from the internal fluid pressure rather than from external contact, distributing the load more effectively and reducing the concentrated stress on the elastic body's main wall
3Reliability
If the stopper part is disposed inside the pressure-absorbing fluid chamber, then durability is improved by avoiding contact with the elastic body, but the space for fluid chamber expansion is reduced
Solution Approach 1:
The stopper part is nested within the pressure-absorbing fluid chamber in a space-efficient manner. By positioning it internally within the existing chamber volume rather than adding external structures, the design maintains maximum fluid chamber expansion space while achieving the durability benefits of internal displacement restriction
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 enhances durability and reduces elastic deformation, providing improved anti-vibration properties over a larger range while maintaining the elastic body's performance for an extended period without degrading due to external stopper contact.
Implementation Method 1
an elastic body provided between an inner cylinder and an outer cylinder
Implementation Method 2
a pair of first pressure-absorbing fluid chambers... a second pressure-absorbing fluid chamber... an auxiliary fluid chamber filled with fluid
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An anti-vibration device has excellent durability while reducing the amount of elastic deformation of an elastic body to a desired value. The disclosed anti-vibration device (1) includes an inner member (2), an outer member (3), an elastic body (4) that allows relative displacement between the inner member (2) and the outer member (3), a pair of first fluid chambers (C1) in communication with each other via first restricting passages (r1), and a second fluid chamber (C2) in communication with an auxiliary fluid chamber (C3) via a second restricting passage (r2). The first fluid chambers (C1) are disposed at opposite sides of the inner member (2). The second fluid chamber (C2) is disposed in an orthogonal direction (Z) that is orthogonal to a sandwiching direction (Y) and to a direction along the axis (O) of the inner member (2). Stopper parts (S) are provided in the first fluid chambers (C1).