Lower Control Arm with Detachable Sleeve for Impact Energy Absorption
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Solution Overview
Problem
Current vehicle suspension systems do not effectively reduce energy and intrusion from frontal impacts into the passenger cabin, leading to potential injuries during collisions.
Innovation Solution
The design of a lower control arm with a tubular sleeve and nonlinear slit allows for detachment during a frontal impact, creating a crumple zone that absorbs more energy and reduces the transfer of force to the passenger cabin, thereby minimizing injuries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the lower control arm is designed with a rigid structure to maintain suspension stability, then the suspension stability is improved, but the energy absorption capability during frontal impact deteriorates
Solution Approach 1:
The lower control arm is divided into two separate components: an arm portion and a sleeve portion. These segments are connected through a controlled detachment mechanism (weld at the interface) that allows the sleeve to separate from the arm during frontal impact, creating a crumple zone. This segmentation enables the structure to transition from a rigid unified form to a segmented configuration that absorbs impact energy through controlled failure.
Solution Approach 2:
The lower control arm transitions from a static rigid structure to a dynamic system with conditional rigidity. During normal operation, the welded connection between the arm and sleeve maintains structural integrity and stability. During frontal impact, the controlled detachment mechanism allows the sleeve to separate and deform, dynamically adapting the structure's rigidity to absorb impact energy while protecting the passenger cabin.
2Reliability
If the lower control arm maintains structural integrity during impact, then the reliability is improved, but the harmful effects of impact force transmitted to the passenger cabin worsen
Solution Approach 1:
The sleeve portion is extracted as a separate detachable component from the main arm structure. This extracted portion serves as a dedicated energy-absorbing element that can be removed from the load path during impact, preventing the transmission of harmful impact forces to the passenger cabin while maintaining the structural integrity of the remaining arm portion.
Solution Approach 2:
The controlled detachment and subsequent deformation of the sleeve portion, which represents a form of structural failure, is converted into a beneficial energy absorption mechanism. The crumple zone created by the detached sleeve transforms the harmful impact energy into deformation work, protecting the passenger cabin from the full force of the impact while the main arm structure remains intact.
Data Source
AI summary
A lower control arm includes a body including a body portion and an arm elongated from the body portion, and a sleeve having a tubular shape. The arm includes an end spaced from the body portion, a top surface, and a bottom surface opposite the top surface. The sleeve is fixed to the end. The sleeve includes a slit extending lengthwise that is disposed closer to one of the top surface and the bottom surface than to a middle of the end.