Resin Shock Absorber Rib Buckling Control

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Solution Overview

Problem

Existing side-impact-resistant resin-made shock absorbing members fail to exhibit good energy absorbing characteristics due to ribs collapsing without buckling, especially when the mounting surface is inclined or the impact direction is horizontal.

Innovation Solution

A mounting structure featuring a cross-shaped rib with coupling portions and a T-shaped outer wall portion, along with collapse prevention ribs that restrict rib movement, ensuring the ribs buckle effectively during side impacts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the mounting surface is inclined vertically or the impact direction is horizontal, then the rib structure becomes simpler, but the ribs slide and collapse without buckling, reducing energy absorption

Engineering Contradiction:

Improverib structure simplicityVSAvoidenergy absorption capability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies preliminary anti-action by providing movement restricting portions on the mounting surface that prevent ribs from sliding in the harmful direction before collapse can occur. These restricting portions create preliminary resistance against the sliding motion that would otherwise lead to catastrophic failure, allowing the ribs to buckle properly and absorb energy as intended.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The movement restricting portions act as intermediaries between the mounting surface and the ribs. Instead of directly allowing free movement or rigidly fixing the ribs, these restricting portions mediate the interaction by permitting controlled movement while preventing harmful sliding, enabling the ribs to buckle effectively without collapsing.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the mounting surface is inclined or impact direction is horizontal, then installation becomes easier, but the ribs cannot maintain proper orientation for buckling

Engineering Contradiction:

Improveinstallation easeVSAvoidrib orientation stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The movement restricting portions provide preliminary anti-action by preventing ribs from moving in directions that would compromise their orientation stability. By restricting movement along the mounting surface, the ribs maintain their proper orientation for buckling even when the mounting surface is inclined or impact directions vary.

Inventive Principle:

Principle #9Preliminary anti-action

3Adaptability or versatility

If the ribs are allowed to move freely on the mounting surface, then the structure becomes more flexible, but the ribs collapse instead of buckling at side impact

Engineering Contradiction:

Improvestructural flexibilityVSAvoidimpact resistance

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent applies segmentation by dividing the mounting surface into regions with different characteristics - areas with movement restricting portions that prevent harmful sliding, and areas that allow necessary movement for buckling. This segmentation enables the structure to have both flexibility for energy absorption and stability for maintaining proper rib orientation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The movement restricting portions provide preliminary anti-action by preventing ribs from sliding in harmful directions before collapse can occur. This preliminary restriction maintains impact resistance while still allowing the ribs to buckle and absorb energy through controlled deformation.

Inventive Principle:

Principle #9Preliminary anti-action

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 configuration ensures effective energy absorption by preventing rib collapse and maintaining constant load absorption, enhancing the side-impact resistance of the resin-made shock absorbing member.

Implementation Method 1

The above shock absorbing members are configured to be able to absorb impact by buckling the ribs at side impact.

Methodology Applied

Scientific EffectBuckling:

Implementation Method 2

capable of exhibiting good energy absorbing characteristics at side impact by preventing ribs from being collapsed

Methodology Applied

Scientific EffectEnergy absorption:

Implementation Method 3

the door trim has a movement restricting portion that restricts the ribs from moving relative to the door trim at side impact

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS8215699B2Mounting structure of side-impact-resistant resin-made shock absorbing member

Publication Date: 2012.07.10 TOYOTA BOSHOKU KK

AI summary

A mounting structure between a door trim and a door panel is provided and includes at least a shock absorbing member and movement restricting members. The shock absorbing member includes a cross-shaped rib including four ribs coupled into a cross shape and arranged perpendicular to the door trim, an outer wall portion coupled to a side edge of at least one of the ribs and has a contact edge in contact with the door trim, and a mounting bearing projecting from the contact edge along the door trim and configured to be fixed to the door trim together with the cross-shaped rib and the outer wall portion. The movement restricting members restrict the ribs from moving relative to the door trim at side impact.