Antivibration Device Receding Surface Stopper Rubber Thickness

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Solution Overview

Problem

In existing antivibration devices, it is challenging to secure the thickness dimension of the stopper rubber without altering the gap between the connecting member and the stopper wall portion.

Innovation Solution

The antivibration device incorporates a connecting member with a receding surface that fits internally within the stopper rubber, allowing the stopper rubber to have an inner fitting portion, which secures the thickness dimension without changing the gap, and includes protrusions that adjust the spring constant stepwise by altering the abutment points on the stopper wall portion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If the gap between the connecting member and the stopper wall portion is maintained at a predetermined value, then the stopper clearance is controlled, but the thickness dimension of the stopper rubber cannot be secured

Engineering Contradiction:

Improvegap between connecting member and stopper wall portionVSAvoidthickness dimension of stopper rubber

Core Design Contradiction:

Length of stationary objectVSLength of moving object

Solution Approach 1:

The connecting member is designed with a receding surface that recedes beyond the base surface in the direction away from the stopper wall portion. This creates an additional dimensional feature that allows the stopper rubber to be securely fitted internally, thereby securing the thickness dimension of the stopper rubber without requiring an increase in the gap between the connecting member and the stopper wall portion.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Strength

If the stopper rubber thickness is increased to improve vibration damping, then the spring constant changes, but the gap between connecting member and stopper wall portion must be enlarged

Engineering Contradiction:

Improvevibration damping capabilityVSAvoidgap between connecting member and stopper wall portion

Core Design Contradiction:

StrengthVSLength of stationary object

Solution Approach 1:

The stopper rubber is designed with different thickness dimensions at different locations. The region corresponding to the receding surface has a greater thickness dimension than the region corresponding to the base surface. This local variation in thickness allows the stopper rubber to provide adequate vibration damping while maintaining the predetermined gap between the connecting member and the stopper wall portion.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The stopper rubber is segmented into different thickness regions: a first region corresponding to the receding surface with greater thickness, and a second region corresponding to the base surface with smaller thickness. This segmentation allows different parts of the stopper rubber to serve different functions - the thicker first region provides vibration damping while the thinner second region maintains the required gap clearance.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If the stopper rubber thickness is varied to adjust spring constant stepwise, then mounting properties improve, but the structure becomes more complex

Engineering Contradiction:

Improvespring constant adjustmentVSAvoidstopper rubber structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The stopper rubber incorporates protrusions at specific locations to create local thickness variations. These protrusions are strategically positioned to make the stopper rubber abut on the stopper wall portion stepwise, enabling stepwise adjustment of the spring constant. This approach achieves adaptability without requiring a completely complex structure, as the variations are localized rather than distributed throughout the entire component.

Inventive Principle:

Principle #3Local quality

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 enables the securement of the stopper rubber's thickness dimension without modifying the gap, while allowing for a stepwise change in the spring constant, enhancing the device's rigidity and mounting properties.

Implementation Method 1

an antivibration base body formed of a rubber-like elastic body and interconnecting the first attached member and the second attached member

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

When displacement of a large amplitude is inputted in the bound direction, the stopper wall portion catches the connecting member and the stopper rubber to operate as a stopper, so that an excessive displacement can be restricted

Methodology Applied

Scientific EffectVibration damping: Damping

Data Source

PatentUS10228041B2Antivibration device

Publication Date: 2019.03.12 TOYO TIRE CORP

AI summary

An antivibration device capable of securing a thickness dimension of a stopper rubber without changing a gap between a connecting member and a stopper wall portion. A connecting member includes a base surface and a receding surface located to recede beyond the base surface in a direction to go away from a stopper wall portion, the base surface and the receding surface face the stopper wall portion, and a stopper rubber includes an inner fitting portion at which the connecting member is internally fitted. Thus, it is possible to secure a thickness dimension of the stopper rubber without changing a gap between the connecting member and the stopper wall portion.