Longitudinal Frame Kick-Up Guide for Lateral Deformation
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Solution Overview
Problem
Conventional body frame structures in vehicles require longer auto body dimensions to achieve sufficient collision energy absorption during frontal collisions, as the longitudinal frame members need to bend and deform upwardly, which limits their effectiveness in energy absorption.
Innovation Solution
A body frame structure with a longitudinal frame member having a closed section and a bent deforming guide member that constrains the frame to bend laterally, allowing the front portion to deform upwardly around a kick-up portion and then laterally, thereby limiting rearward deformation and increasing collision energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the front portion of the longitudinal frame member is bent and deformed upwardly around the kick-up portion during a frontal collision to absorb collision energy, then the collision energy absorption is improved, but the longitudinal dimension of the front compartment becomes longer and the auto body becomes longer
Solution Approach 1:
The patent introduces bent deforming guide members that redirect the deformation of the front portion from the longitudinal direction to the lateral direction. The guide members have guide surfaces that constrain the front portion to deform laterally around the kick-up portion, transforming the deformation path from a longitudinal bending motion to a lateral bending motion, thereby resolving the contradiction between energy absorption and body length
Solution Approach 2:
The patent changes the deformation parameter from longitudinal bending displacement to lateral bending displacement. By providing guide surfaces with specific geometries (such as inclined surfaces or arc-shaped surfaces), the deformation mode is transformed, allowing the front portion to absorb collision energy through lateral deformation rather than longitudinal extension, thus maintaining a compact body length while achieving sufficient energy absorption
2Loss of energy
If the front portion is allowed to bend and deform freely in the rear direction to secure predetermined collision energy absorption, then the energy absorption is improved, but the bent deformation displacement in the rear direction increases the body length
Solution Approach 1:
The patent applies local quality by providing bent deforming guide members only in specific regions where deformation control is needed. The guide members are positioned to constrain the front portion at critical locations, allowing controlled lateral deformation while preventing uncontrolled longitudinal displacement, thus achieving energy absorption without excessive body lengthening
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
This configuration enhances collision energy absorption by redirecting bending deformation from the vertical to the lateral direction, allowing for increased energy absorption without lengthening the vehicle's body, while also preventing interference with internal components.
Implementation Method 1
the front portion is bent and deformed upwardly around the kick-up portion when a collision load is applied to the longitudinal frame member
Implementation Method 2
constrains the longitudinal frame member to bend and deform in the lateral direction of the vehicle at the front portion by collision of components of the guide member due to the applied frontal collision load
Implementation Method 3
the front portions are bent and deformed upwardly around the kick-up portions, thereby absorbing the collision energy
Data Source
AI summary
In a body frame structure for an automotive vehicle, the amount of the bending and deforming of a longitudinal frame member in the rear direction can be controlled and the amount of the collision energy absorption during a frontal collision can be increased. A kick-up portion that bends and deforms the front portion upwardly during the application of the collision load is provided between a front portion and a rear portion of the closed section of the longitudinal frame member, which extend in the longitudinal direction of the vehicle. A deformation guide member, which constrains the longitudinal frame member to bend and deform in the lateral direction of the vehicle at the front portion by colliding portions of the deformation guide member with each other due to the applied frontal collision load, is provided inside the closed section of the kick-up portion of the longitudinal frame members.