Spring Seat Support Arm Structure to Prevent Full-Rebound Spring Separation

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Solution Overview

Problem

In vehicles with high wheel rates for improved handling and reduced weight, the spring connecting the suspension arm to the body member can separate during full rebound, leading to potential accidents like vehicle rollover, and reducing wheel stroke to prevent separation is difficult without affecting vehicle performance.

Innovation Solution

A suspension system with a spring seat support arm that includes a cantilevered structure with a protrusion portion and a stopper, which fixes the spring in place during full rebound by contacting the body frame, using an elastic stopper for impact absorption and noise reduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the hardness of the spring is increased to improve handling performance, then the wheel rate increases, but the spring compression amount is reduced and the spring may separate during full rebound

Engineering Contradiction:

Improvespring hardnessVSAvoidspring separation prevention

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

A rubber buffer is introduced as an intermediary component between the spring and the spring seat. This buffer absorbs the impact and prevents direct contact during full rebound, thereby preventing spring separation while allowing the spring to maintain its high hardness for good handling performance

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The rubber buffer is positioned in advance at the spring seat to cushion the spring before it can separate. The buffer absorbs the rebound energy and prevents the spring from rising and separating from the spring seat during full rebound conditions

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If the wheel stroke is reduced to prevent spring separation, then the spring remains within tensioning range, but the vehicle performance and merchantability are affected

Engineering Contradiction:

Improvespring separation preventionVSAvoidvehicle performance

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The rubber buffer acts as a mediator that allows the spring to extend beyond its normal tensioning range without causing separation. This enables the wheel stroke to be maintained for vehicle performance while the buffer prevents spring separation by absorbing the excess rebound energy

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Prevents spring separation, enhancing vehicle stability and safety by securing additional wheel stroke and ride comfort without affecting the spring's hardness, thus preventing accidents like rollover.

Implementation Method 1

a rod portion extending from the coupled portion along a longitudinal direction of the suspension arm and configured to be elastically deformed in response to external force

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

using an elastic stopper for impact absorption and noise reduction

Methodology Applied

Scientific EffectImpact absorption: Damping

Data Source

PatentEP4056392B1Suspension for vehicle

Publication Date: 2025.11.05 HYUNDAI MOTOR CO LTD

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AI summary

A suspension for a vehicle is configured such that, even in a situation of departing from a range in which a spring may be tensioned as a rebound state is added in a full rebound state, a lower end of the spring is continuously supported by a spring seat support arm, so as to prevent separation of the spring connecting a suspension arm to a body member