Center Pillar Breakage Inducing Step-Down Side Collision
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Solution Overview
Problem
Existing vehicle center pillar structures do not efficiently absorb side collision energy, as energy-absorbing materials are not activated until the collision has progressed significantly, and they require a larger volume to be effective.
Innovation Solution
A side vehicle-body structure with a center pillar featuring a breakage inducing portion and a step-down corner, where energy-absorbing material is placed between the step-down portion and the inner panel, allowing immediate energy absorption and reducing material volume by using the reinforcement member as an integral part of the energy-absorbing material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If energy absorbing material is compactly disposed on the inner member of the center pillar portion, then the structure is space-efficient, but the energy absorbing material does not absorb energy until the side collision progresses to a certain degree
Solution Approach 1:
The energy absorbing material is pre-positioned at the step-down portion of the center pillar outer wall, which is a location that experiences collision load early in the impact sequence. This preliminary positioning ensures the material is in place to absorb energy from the outset of the collision, rather than requiring significant deformation before activation.
Solution Approach 2:
The invention places energy absorbing material at a specific location (step-down portion of the outer wall) rather than uniformly distributing it. This localized placement at the corner portion creates a preferential path for collision loads to engage the energy absorbing material immediately, optimizing both space utilization and absorption timing.
2Reliability
If energy absorbing material is placed to activate early in side collision, then energy absorption efficiency improves, but the material requires larger volume to be effective
Solution Approach 1:
By concentrating energy absorbing material at the step-down portion (corner region) of the center pillar outer wall, the invention creates a localized energy absorption zone that is strategically positioned to intercept collision loads early. This local placement is more efficient than uniform distribution, achieving better absorption efficiency with less total material volume.
Solution Approach 2:
The step-down portion creates a geometric feature that changes the dimensional arrangement of the energy absorbing material placement. By utilizing the corner portion and creating a stepped configuration, the material is positioned in a three-dimensional location that optimizes its ability to engage collision forces early in the impact sequence.
3Reliability
If the center pillar is caused to have a vertical shape by temporarily breaking the center pillar lower portion side at the time of a side collision, then the up-down-direction intermediate portion does not intrude into the vehicle cabin, but the structure complexity increases
Solution Approach 1:
The breakage inducing portion is pre-formed in the center pillar structure during manufacturing, positioned to facilitate controlled breakage at the lower portion. This preliminary preparation allows the pillar to temporarily break and become vertical during collision, preventing cabin intrusion without requiring complex active control systems.
Solution Approach 2:
The center pillar is designed with a breakage inducing portion that allows it to segment into upper and lower portions during collision. This segmentation enables the upper portion to become vertical and protect the cabin, while the lower portion can deform or separate, achieving protection through structural division rather than complex mechanisms.
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 enables efficient absorption of side collision energy while downsizing the energy-absorbing material, reducing the number of parts and assembly time, and improving energy absorption efficiency.
Implementation Method 1
the energy absorbing material can be downsized, and the side collision energy can be efficiently absorbed
Data Source
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AI summary
A side vehicle-body structure for a vehicle is provided. The side vehicle-body structure includes a center pillar 35 in which a lower end side is positioned on a vehicle-width-direction outer side with respect to an upper end thereof, in which the center pillar 35 includes an outer wall 35, a breakage inducing portion 36 that is provided to be close to a lower portion of an outer wall 35c of the center pillar 35 and is configured to induce breakage at time of a side collision, and a step-down portion 35f provided in a corner portion of a center pillar outer wall 35c of the breakage inducing portion 36, and an energy absorbing material 50 is disposed between the step-down portion 35f and an inner panel 32.