Light-Metal Control Arm Reinforcement for Eccentric Slot Wear

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Solution Overview

Problem

Control arms made of light metals like aluminum are susceptible to damage and wear due to high forces and moments during operation, particularly when adjusting camber angles with eccentric adjustment devices, leading to deformation and damage from the bolt or screw rubbing against the elongated holes in the side wall.

Innovation Solution

Incorporating a reinforcing element made of a harder material, such as steel, into the side wall of the control arm body to reinforce the elongated hole, providing enhanced mechanical resistance and protection against wear and deformation, while maintaining a lightweight design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of moving object

If control arm bodies are made of light metal to reduce weight, then weight is reduced, but wear resistance and damage resistance deteriorate due to high forces and rubbing during operation

Engineering Contradiction:

Improvecontrol arm weightVSAvoidwear resistance

Core Design Contradiction:

Weight of moving objectVSReliability

Solution Approach 1:

The control arm body is made of light metal (aluminum alloy) while the elongated hole is reinforced with a harder material (steel or cast iron) having superior wear resistance. This composite construction combines the weight advantages of light metal with the durability of harder materials in the critical wear zone.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Instead of making the entire control arm from hard material, the reinforcement is applied locally only to the elongated hole where wear occurs during camber adjustment. This localized reinforcement maintains overall lightweight design while providing targeted protection against rubbing and deformation.

Inventive Principle:

Principle #3Local quality

2Weight of moving object

If light metal control arms are used, then weight is reduced, but susceptibility to deformation and damage during assembly and adjustment increases

Engineering Contradiction:

Improvecontrol arm weightVSAvoiddamage resistance

Core Design Contradiction:

Weight of moving objectVSStrength

Solution Approach 1:

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The reinforcing element is installed beforehand in the elongated hole to prevent deformation and damage during subsequent assembly operations and camber adjustment procedures. The reinforcement acts as a protective cushion against the high forces and rubbing that occur during these operations.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Weight of moving object

If the control arm body is made of light metal, then weight is reduced, but the bolt or screw of the eccentric adjustment device rubs or digs into the elongated hole causing deformation

Engineering Contradiction:

Improvecontrol arm weightVSAvoidrubbing and digging damage

Core Design Contradiction:

Weight of moving objectVSObject-affected harmful factors

Solution Approach 1:

The reinforcing element made of harder material (steel or cast iron) acts as an intermediary between the eccentric adjustment device bolt/screw and the light metal control arm body. This intermediary layer prevents the bolt from directly rubbing and digging into the softer aluminum alloy, eliminating deformation while maintaining lightweight construction.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Weight of moving object

If the control arm body is made of light metal, then weight is reduced, but component lifespan is reduced due to wear and damage from high forces

Engineering Contradiction:

Improvecontrol arm weightVSAvoidcomponent lifespan

Core Design Contradiction:

Weight of moving objectVSDuration of action of stationary object

Solution Approach 1:

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The reinforcing element serves as a sacrificial protective layer that absorbs wear and damage, preserving the main control arm body structure. By concentrating wear on the replaceable or integrated reinforcement, the overall component lifespan is extended while maintaining lightweight advantages.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS20260008310A1Control arm for a wheel suspension in a motor vehicle

Publication Date: 2026.01.08 BENTELER AUTOMOBILTECHNIK GMBH

AI summary

A control arm for a wheel suspension in a motor vehicle. The control arm has a control arm body made of light metal, which has two side walls, and in at least one side wall an elongated hole is provided, which is designed and intended to cooperate with an eccentric adjustment device. At least one wall section of an inner wall of the elongated hole is formed by a reinforcing element, wherein the reinforcing element includes a material which has a higher hardness than the material of the side wall of the control arm body.