Light-Metal Control Arm with Steel Eccentric Mount Wear Protection
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Solution Overview
Problem
Control arms made of light metals like aluminum are susceptible to damage and wear due to high operational forces and torques, particularly during assembly and adjustment of camber and toe angles, which is also a concern for fiber composite plastics.
Innovation Solution
The control arm incorporates an eccentric mount with a base plate and anchor body that creates a press-fit connection with the control arm body, featuring eccentric stops for stability and wear protection, using a higher-strength material like steel for the eccentric mount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If control arm bodies are made of light metal to reduce weight, then weight is reduced, but the components become susceptible to damage and wear due to high forces and torques
Solution Approach 1:
The control arm body is made of light metal (aluminum alloy) while the eccentric mount is made of steel material, creating a composite structure that combines the weight advantages of aluminum with the strength and wear resistance of steel in the critical connection region
Solution Approach 2:
The eccentric mount provides localized reinforcement and wear protection at the elongated hole region where high stresses occur during camber and toe adjustments, while the rest of the control arm body remains lightweight aluminum
2Adaptability or versatility
If an eccentric adjustment device is used to adjust camber and toe angles, then adjustability is improved, but the control arm becomes susceptible to wear and damage during adjustment operations
Solution Approach 1:
The eccentric mount acts as an intermediary component between the control arm body and the eccentric adjustment device, absorbing wear and damage during adjustment operations while protecting the aluminum control arm body
Solution Approach 2:
The steel eccentric mount is installed beforehand in the elongated hole to provide protective cushioning against wear and damage that would otherwise occur to the aluminum control arm body during repeated camber and toe adjustments
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 solution provides robust wear protection and stable force transmission, reducing material costs and weight while optimizing installation space, ensuring the control arm withstands high forces and torques.
Implementation Method 1
the anchor body of the eccentric mount and the elongated hole in the side wall of the control arm are manufactured and matched to each other in such a way that a press fit is created at the connection points after joining. This allows longitudinal and transverse forces to be transmitted in a force-fitting manner.
Data Source
AI summary
A control arm for a wheel suspension in a motor vehicle has a control arm body made of light metal. The control arm body has two parallel side walls. An elongated hole for an eccentric mount is provided in at least one side wall. The eccentric mount has a base plate with an elongated hole. An anchor body extending on the side of the edge of the elongated hole is provided at the rear of the base plate. At the front, the base plate has two eccentric stops projecting from the base plate. The eccentric mount is inserted with the anchor body into the elongated hole of the side wall and joined by pressing into the elongated hole.