Vehicle Bumper Back Beam with Convex Central Portion
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Solution Overview
Problem
The existing collision energy absorption structures in vehicles suffer from increased deformation and reduced efficiency due to bending of side members when the central portion of the bumper back beam collides with obstacles, leading to inefficient energy absorption by the crush box.
Innovation Solution
A collision energy absorption structure featuring a bumper back beam with a convex central portion and bent ends, where a crush box is coupled with both ends of the bumper back beam, and a crush plate is mounted on the side member, forming a penetrating groove for secure assembly, which reduces side member deformation and enhances energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bumper back beam has a convex central portion that collides with the barrier first, then the collision timing is improved, but the side member bends outward causing increased deformation
Solution Approach 1:
The crush box is introduced as an intermediary component between the bumper back beam and the side member. When the convex central portion of the bumper back beam collides with the barrier, the impact force is transmitted through the crush box which absorbs energy through controlled deformation, preventing the force from directly bending the side member outward. This mediator structure resolves the contradiction by allowing timely collision while protecting side member stability.
Solution Approach 2:
The crush box changes the physical parameters of force transmission by introducing energy absorption through plastic deformation. Instead of direct rigid force transmission that causes side member bending, the crush box modifies the force profile through controlled crushing, reducing the harmful outward bending moment on the side member while maintaining collision timing effectiveness.
2Loss of energy
If the crush box is positioned between the bumper back beam and side member, then energy absorption is improved, but the side member still experiences bending reducing overall efficiency
Solution Approach 1:
The bumper back beam is segmented with a convex central portion that separates the collision point from the side member connection points. This segmentation ensures that when the central portion collides, the side members are not directly involved in the initial impact, preventing bending while allowing the crush box to efficiently absorb energy between the beam and side members.
Solution Approach 2:
The convex shape of the bumper back beam's central portion creates preliminary anti-action by directing the collision force upward and inward toward the crush box, rather than allowing the force to naturally transmit outward to the side members. This pre-directed force path prevents side member bending before it can occur, while maintaining effective energy absorption.
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 minimizes vehicle deformation and improves collision energy absorption efficiency by uniformly distributing impact energy, as shown in the accompanying graphs, indicating increased initial acceleration followed by reduced acceleration, signifying effective energy absorption during collisions.
Implementation Method 1
a crush box, of which a first side protrudes in a front direction of the bumper back beam and of which a second side is interposed between the bumper back beam and the side member
Implementation Method 2
Both distal end portions of the bumper back beam are bent in a rear direction of the vehicle, wherein a central portion of the bumper back beam is shaped convex in a front direction of the vehicle
Data Source
AI summary
A collision energy absorption structure of a vehicle may include a bumper back beam that may be disposed in a traverse direction of the vehicle, a side member that may be disposed at a predetermined distance from the bumper back beam in a longitudinal direction of the vehicle, and a crush box, of which a first side protrudes in a front direction of the bumper back beam and of which a second side may be interposed between the bumper back beam and the side member.