Vibration Damping Device Integral Stopper Design
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Solution Overview
Problem
Conventional vibration damping devices for motor vehicles require additional metal stoppers, increasing the number of parts and production complexity, while attempts to simplify the structure often compromise on strength or lead to weight increases.
Innovation Solution
A vibration damping device with an integrally formed stopper portion on the outer bracket, featuring a dual structure for the axis-perpendicular stopper member to maintain strength and a simple, lightweight design with fewer parts, including an annular stopper portion and pressure receiving portions that prevent thinning and ensure effective load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate metal stopper is fixed to the outer bracket by welding, then the stopper member can restrict displacement effectively, but the number of parts and production processes increases
Solution Approach 1:
The stopper portion is integrated directly into the outer bracket as a single molded part, eliminating the need for separate metal stoppers and welding operations. This merging of components reduces part count and simplifies production while maintaining the stopper's displacement restriction function through the molded structure's geometric design
2Device complexity
If the upper end portion of the stopper portion is bent to extend outward, then the structure is simplified, but the thickness becomes insufficient and strength decreases
Solution Approach 1:
The outer bracket is designed with non-uniform thickness distribution: the stopper portion maintains sufficient thickness for strength, while other portions can be thinner to reduce overall weight. This local quality variation allows the structure to be both simple and strong where needed
3Strength
If the thickness is increased at the portion extended toward the outer periphery, then enough strength is maintained, but other portions become thicker than necessary, resulting in weight increase
Solution Approach 1:
The outer bracket features variable thickness distribution where the stopper portion has sufficient thickness for strength requirements, while other non-critical portions are optimized to be thinner. This localized thickness variation maintains necessary strength without increasing overall weight
4Device complexity
If the stopper portion is integrally formed with the outer bracket, then the number of parts is reduced, but the portion extended toward the outer periphery becomes thin and weak
Solution Approach 1:
The integral outer bracket is designed with optimized local thickness at the stopper portion, ensuring sufficient strength despite the single-piece construction. The thickness distribution is tailored so that the stopper portion has adequate material for load-bearing while other areas are minimized
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 solution achieves a vibration damping device with superior load-bearing capacity and durability, reducing the risk of damage from heavy loads and noise, while maintaining a simple structure with fewer parts and stable assembly.
Implementation Method 1
a main rubber elastic body elastically connecting the first and second mounting members
Implementation Method 2
Vibration damping devices have conventionally been known as a kind of vibration damping connecting components or vibration damping supports interposed between members that compose the vibration transmission system
Data Source
AI summary
A vibration damping device including a main rubber elastic body elastically connecting a second mounting member and a first mounting member being arranged on axially one side of the second mounting member and a cylindrical outer bracket fit onto the second mounting member. A stopper portion integrally formed with the outer bracket extends radially inwardly to provide a first pressure receiving portion. A bound stopper member that restricts mutually approaching displacement of the two mounting members in the axial direction is constituted by including the first pressure receiving portion. A cylindrical second pressure receiving portion in a dual structure is formed by having the first pressure receiving portion extend axially inwardly and then folded axially outwardly. An axis perpendicular stopper member that restricts relative displacement of the two mounting members in the axis perpendicular direction is constituted by including the second pressure receiving portion.