Split Outer Cylindrical Member for Axial Positioning Stability
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Solution Overview
Problem
Conventional cylindrical vibration-damping devices face challenges in maintaining relative positioning between intermediate rings and outer cylindrical members due to insufficient friction resistance, leading to instability under large load inputs.
Innovation Solution
A cylindrical vibration-damping device with a novel structure featuring a pair of intermediate rings elastically connected by a main rubber elastic body and an outer cylindrical member divided into two sections, where regulating protrusions on the outer cylindrical member prevent axial displacement of the intermediate rings by abutting against them, providing stable positioning and pre-compression to the rubber elastic body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the intermediate ring is attached to the outer cylindrical member in a non-adhesive manner, then the ease of manufacture is improved, but the reliability of relative positioning deteriorates under large load inputs
Solution Approach 1:
The outer cylindrical member is divided into two sections along its circumference, creating a split configuration. This segmentation allows the intermediate ring to be sandwiched between the two sections in the radial direction, providing secure retention without requiring adhesive bonding while maintaining ease of manufacture.
Solution Approach 2:
The patent transitions from relying solely on axial friction resistance to utilizing radial dimensional constraints. By sandwiching the intermediate ring between the two sections of the outer cylindrical member in the radial direction, the system adds a new dimensional constraint that prevents relative displacement without requiring adhesive bonding.
2Device complexity
If only friction resistance is used to limit relative displacement, then the device complexity is reduced, but the stability under large load inputs deteriorates
Solution Approach 1:
The outer cylindrical member is segmented into two sections that can be assembled around the intermediate ring. This segmentation creates a sandwich structure that provides stable relative positioning under large loads while adding minimal complexity to the overall device design.
Solution Approach 2:
The two sections of the outer cylindrical member act as intermediaries that sandwich the intermediate ring, providing mechanical constraint and stable positioning. This intermediary structure enhances stability under load without significantly increasing device complexity.
3Manufacturing precision
If the outer cylindrical member is made as one piece, then the manufacturing precision is improved, but the ease of manufacture deteriorates due to assembly difficulty
Solution Approach 1:
The outer cylindrical member is divided into two sections that can be manufactured separately and then assembled around the intermediate ring. This segmentation improves ease of manufacture by allowing separate fabrication and simpler assembly, while maintaining sufficient manufacturing precision for each section.
Solution Approach 2:
The intermediate ring is nested between the two sections of the outer cylindrical member in the radial direction. This nested configuration allows the components to be assembled in a straightforward manner while maintaining precise relative positioning, improving ease of manufacture without sacrificing manufacturing precision.
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 the stability and durability of the vibration damping performance by reducing tensile stress on the rubber elastic body and improving manufacturability, while maintaining effective vibration damping characteristics.
Implementation Method 1
a main rubber elastic body elastically connecting the stopper portion and the intermediate rings
Implementation Method 2
relative displacement inward in the axial direction of the intermediate ring with respect to the outer cylindrical member is only limited by the friction resistance and the like acting between the outer peripheral surface of the intermediate ring and the inner peripheral surface of the outer cylindrical member
Data Source
AI summary
A cylindrical vibration-damping device wherein an outer cylindrical member is made in a configuration of two sections divided along an circumference, the outer cylindrical member being externally fitted onto intermediate rings in a non-adhesive manner by means of having the intermediate rings sandwiched by the outer cylindrical member in a radial direction, and a plurality of regulating protrusions protruding inward in the radial direction are formed on the outer cylindrical member at a given distance and arranged on both sides of the intermediate rings in an axial direction so as to provide a positioning member that positions the intermediate rings with respect to the outer cylindrical member in the axial direction by means of abutting the intermediate rings against the regulating protrusions in the axial direction.