Bumper Beam Pipe Expansion Joint With Pull-Out Obstruction
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Solution Overview
Problem
Existing methods for joining dissimilar metal components in multi-materialization, such as in the automobile industry, face challenges in achieving high joining strength, particularly when the tube body is pulled out from the hole portion.
Innovation Solution
A method involving a tube body with a pulling-out obstructing portion that protrudes from its outer surface, which abuts on the wall surface body when the tube body is pulled out, preventing its removal and enhancing joining strength through pipe expansion joining, such as rubber bulge joining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the hole portion shape is designed to accommodate the tubular portion and pulling-out obstructing portion in non-expanded state, then ease of manufacture is improved, but device complexity increases
Solution Approach 1:
The hole portion is pre-formed with a specific shape that anticipates the non-expanded configuration of the tube body and pulling-out obstructing portion. This preliminary shaping of the hole allows the components to be inserted in their non-expanded state, simplifying the assembly process while the subsequent expansion creates the final joined structure
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 ensures high joining strength and reliability by preventing the tube body from being pulled out, while also allowing for easy manufacturing and increased adhesion between the tube body and the wall surface body.
Implementation Method 1
The rubber bulge joining is a method in which a tube body is inserted into a hole portion of a wall surface body, and the tube body is expanded and deformed using an elastic body to press the tube body against the hole portion of the wall surface body.
Data Source
AI summary
A bumper system includes a rear wall of a bumper beam provided with hole portions, and a bumper stay including tubular portions extending in the longitudinal direction, the tubular portions being inserted into the hole portions and joined to the hole portions by pipe expansion joining. The bumper stay includes a pulling-out obstructing portion protruding from the outer surfaces of the tubular portions in a cross section perpendicular to the longitudinal direction. The pulling-out obstructing portion abuts on the rear wall of the bumper beam in the direction in which the bumper stay is pulled out from the hole portions.