Vibration Isolating Bushing with Inverted Curved Stoppers

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Solution Overview

Problem

The existing suspension bushing design experiences a reduction in supporting area and increased load on stoppers during wrench inputs, leading to potential abrasion and breakage, which compromises durability.

Innovation Solution

A vibration isolating bushing with an inner cylinder side stopper recessed inwardly and an outer cylinder side stopper projecting inwardly, both with curved surfaces and elastic body layers, to increase the supporting area and reduce uneven abrasion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the inner cylinder side stopper projects outwardly and the outer cylinder side stopper projects inwardly in the prior art design, then the stoppers can effectively regulate large displacement during horizontal inputs, but the supporting area of the stoppers is reduced during wrench inputs, leading to increased load and potential abrasion

Engineering Contradiction:

Improvedurability of stoppersVSAvoidsupporting area of stoppers

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The invention inverts the conventional stopper configuration by making the inner cylinder side stopper recessed inwardly instead of projecting outwardly, while the outer cylinder side stopper projects inwardly. This inversion allows the stoppers to maintain a larger supporting area during wrench inputs, reducing load concentration and improving durability without sacrificing displacement regulation capability

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention applies curved surfaces to the stoppers, specifically forming the inner cylinder side stopper with a concave curve surface and the outer cylinder side stopper with a convex curve surface. This curvature design increases the supporting area during wrench inputs compared to flat surfaces, distributing the load more evenly and reducing uneven abrasion while maintaining effective displacement regulation

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Reliability

If the stoppers are designed with large contact area to distribute load, then durability is improved, but the change in contact area during wrench inputs increases, leading to uneven abrasion

Engineering Contradiction:

Improvedurability of stoppersVSAvoidconsistency of contact area

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The curved surface design of the stoppers (concave for inner, convex for outer) maintains a more consistent contact area during wrench inputs compared to flat surfaces. The curvature allows the stoppers to accommodate angular displacement while preserving substantial contact area, reducing the variation in contact area and thereby minimizing uneven abrasion

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The invention changes the geometric parameters of the stoppers by introducing curvature and recessed/protruding configurations. These parameter changes enable the stoppers to maintain optimal contact area during both horizontal and wrench inputs, balancing load distribution with contact area stability to improve durability while reducing uneven wear

Inventive Principle:

Principle #35Parameter changes

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 enhances the durability of the stoppers by maintaining a larger supporting area and reducing uneven abrasion, while also minimizing weight and contact area changes during wrench inputs.

Implementation Method 1

an insulator (30) for connecting these inner and outer cylinders... These vibration inputs are absorbed by an insulator 130

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

an inner cylinder side elastic body layer (38) and an outer cylinder side stopper elastic body layer (56) are formed on surfaces of the inner cylinder side stopper (40) and the outer cylinder side stopper (50)... a shock at the initial stage of contact between the inner cylinder side stopper (40) and the outer cylinder side stopper (50) can be softened

Methodology Applied

Scientific EffectElastic compression: Elasticity

Data Source

PatentUS9562586B2Vibration isolating bushing

Publication Date: 2017.02.07 YAMASHITA RUBBER CO LTD

AI summary

To suppress a decrease in durability due to abrasion or breakage caused by a reduction of a supporting area of a stopper at the time a wrench is inputted. An inner cylinder and an outer cylinder are connected by an insulator. An inner cylinder side stopper of concave curve surface is formed on an outer circumference of an intermediate part in the longitudinal direction of the inner cylinder. On the other hand, an outer cylinder side stopper that projects toward the inner cylinder side stopper is provided on an outside of the inner cylinder side stopper. The outer cylinder side stopper is relatively moved in a recessed space of the inner cylinder side stopper so as to regulate the reduction of the supporting area.