Stabilizer Bush Movement Prevention via Resin Molded Engagement

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Solution Overview

Problem

The existing stabilizer apparatuses face issues with the movement of the bush due to centrifugal force, leading to unbalanced fix positions and insufficient anti-roll effect, resulting in reduced reliability and increased interference with surrounding parts, especially when using aluminum or iron rings as movement stoppers.

Innovation Solution

A stabilizer apparatus with a torsion portion and arm portions in a U-shape, featuring a resin-made bush integrally molded with a concavo-convex structure on the torsion portion to prevent bush movement, providing enhanced engagement and resistance against centrifugal forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an aluminum ring or iron ring is caulked as a movement stopper member, then the bush movement is prevented, but the fix strength is low and the caulked condition is easily broken under load

Engineering Contradiction:

Improvebush movement preventionVSAvoidfix strength of movement stopper

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The movement stopper member is made of resin material that is integrally molded to the torsion portion, creating a composite structure that combines the advantages of resin (high strength, no caulked joints) with precise geometric engagement through the concavo-convex structure. This eliminates the weak caulked connections of metal rings while maintaining movement prevention capability.

Inventive Principle:

Principle #40Composite materials

2Reliability

If the bush is directly fixed to the torsion portion by adhesive or heat curing, then the bush movement is prevented, but the manufacturing complexity and process steps increase

Engineering Contradiction:

Improvebush movement preventionVSAvoidmanufacturing process simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The movement stopper member is integrally molded to the torsion portion during the stabilizer manufacturing process itself, making the movement prevention function self-included in the base manufacturing process. No separate adhesive application or heat curing steps are required, as the integral molding creates a permanent attachment during the primary manufacturing operation.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The movement stopper member and torsion portion are combined into a single integrally molded component, merging the movement prevention function with the structural component. This eliminates the need for separate attachment processes and reduces manufacturing steps while ensuring reliable movement prevention.

Inventive Principle:

Principle #5Merging (Combining)

3Strength

If a resin movement stopper member is used, then the weight is reduced and the fix strength is improved, but the engagement structure must be precisely designed

Engineering Contradiction:

Improvefix strength of movement stopperVSAvoidengagement structure design

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The concavo-convex structure is provided only at the specific location where the movement stopper member contacts the torsion portion, concentrating the engagement complexity only where needed. The rest of the torsion portion maintains its simple cylindrical shape, minimizing overall structural complexity while ensuring precise engagement at the critical interface.

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

The concavo-convex structure effectively prevents bush movement, ensuring balanced fix positions, improved reliability, and reduced interference with surrounding parts, while maintaining the strength and compactness of the stabilizer apparatus.

Implementation Method 1

a concavo-convex structure engaging with the movement stopper member is provided on a peripheral surface of the torsion portion

Methodology Applied

Scientific EffectMechanical interlocking: Mechanical Fastener

Implementation Method 2

a load is generated by centrifugal force when a vehicle runs at a curve, and the position of the bush to the torsion portion is moved by the load against frictional force therebetween

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentEP2308705B1Stabilizer device and method of manufacturing same

Publication Date: 2016.02.17 NHK SPRING CO LTD

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Figure 4A~5B
Figure 6~7B

AI summary

A stabilizer apparatus 1 includes: a stabilizer 100 which has a torsion portion 110 and arm portions 120 extending from both end portions of the torsion portion so as to have an approximate U-shape; a bush 300 which is provided at both the end portions of the torsion portion 110 and is used for fixing the stabilizer 100 to a vehicle body 10; and a movement stopper member 400 which is made of resin, has a contact portion 410 contacting the bush 300, and is integrally molded to the torsion portion 110 so as to cover overall periphery of predetermined range of the torsion portion 110 in an axial direction thereof, wherein a concavo-convex structure 111 engaging with the movement stopper member 400 is provided on a peripheral surface of the torsion portion 110. The reliability can be improved by preventing of the movement of the bush.