Segmented Stopper Rubber for Vertical Vibration Isolation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing vibration isolation structures face challenges in restricting vertical vibrations while maintaining minimal deformation of the rubber elastic body under heavy loads, as the dynamic spring constant in the vertical direction is typically high due to the full surface contact of stopper rubbers, leading to excessive displacement of the vibration origin.

Innovation Solution

A vibration isolation structure with a stopper portion featuring a first protruding portion and a second protruding portion, where the second portion is thinner and spaced apart, maintaining a non-contact state until the first portion deforms under load, allowing the second portion to engage only at higher loads, thereby reducing vertical displacement and maintaining minimal deformation of the rubber elastic body.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the stopper rubber has a deformable thick shape to exhibit soft spring characteristics, then the dynamic spring constant in the vertical direction is reduced, but when a heavy load is input in the longitudinal direction, the rubber elastic body considerably deforms and the displacement of the engine cannot be reduced

Engineering Contradiction:

Improvevertical vibration transmissionVSAvoidengine displacement control

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The stopper rubber is divided into two separate protruding portions (first and second) that are spaced apart from each other. This segmentation allows each portion to independently contact the contact member at different load levels, creating a progressive engagement mechanism that provides soft spring characteristics in the vertical direction while maintaining engine position stability under heavy longitudinal loads

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stopper rubber structure transitions from a static thick deformable shape to a dynamic system where the two protruding portions engage sequentially based on load magnitude. The first protruding portion engages at lower loads providing vertical compliance, while the second protruding portion engages at higher loads to prevent excessive engine displacement, creating a load-adaptive response

Inventive Principle:

Principle #15Dynamics

2Force

If the entire surface of the stopper rubber comes into contact with the member on the vehicle body side, then the stopper rubber in the contact state has a large dynamic spring constant in the vertical direction, but this prevents effective restriction of vertical vibrations

Engineering Contradiction:

Improvevertical load bearing capacityVSAvoidvertical vibration transmission

Core Design Contradiction:

ForceVSObject-affected harmful factors

Solution Approach 1:

Instead of a continuous contact surface, the stopper rubber is segmented into two discrete protruding portions. This segmentation reduces the contact area at any given load level, lowering the dynamic spring constant in the vertical direction and improving vibration isolation while still providing sufficient load bearing capacity through progressive engagement of the segmented portions

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stopper rubber structure implements local quality by concentrating the stopping function at two specific localized protruding portions rather than distributing it across the entire surface. This localized approach reduces overall contact stiffness while maintaining effective stopping capability at critical points

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 achieves a small dynamic spring constant in the vertical direction, reducing vertical displacement and noise transmission while ensuring the rubber elastic body does not significantly deform under heavy loads, thus effectively isolating vibrations.

Implementation Method 1

a rubber elastic body provided between the first attachment member and the second attachment member

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

a stopper portion made of rubber, provided on an end face of the first attachment member closer to an outside in a main load input direction, and restricting deformation of the rubber elastic body in the main load input direction

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS10807454B2Vibration isolation structure

Publication Date: 2020.10.20 KURASHIKI KAKO CO LTD

AI summary

A stopper portion includes a first protruding portion protruding from the end face of the first attachment portion closer to the outside in the main load input direction toward the outside in the main load input direction; and a second protruding portion protruding from the end face of the first attachment portion closer to the outside in the main load input direction toward the outside in the main load input direction, being spaced apart from the first protruding portion so as to be in a non-contact state with the first protruding portion, being thinner than the first protruding portion in the main load input direction, and having a protruding end in which a distance between the protruding end and the contact surface is longer in the main load input direction than a distance between a protruding end of the first protruding portion and the contact surface.