Crash Box Reinforcement for Stronger Lashing Hook Support
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Solution Overview
Problem
The challenge is to enhance the support strength of a lashing hook in a crash box while maintaining the manufacturing cost and weight efficiency, as existing methods using spot welding face limitations in ensuring the required strength and often result in increased thickness and weight when arc welding is used.
Innovation Solution
The integration of a reinforcing member along the lashing bracket within the tubular body, coupled to both end portions of the tubular body, supports the lashing hook, allowing for reduced steel sheet thickness and maintaining strength, even when the crash box is formed by spot welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If arc welding is used to join steel sheets to ensure lashing hook support strength, then the support strength is improved, but the steel sheet thickness and weight increase
Solution Approach 1:
The crash box structure is segmented into multiple functional components: the main tubular body formed by spot-welded steel sheets, and a separate reinforcing member (elongated rivet pin) that is inserted and riveted to provide localized strengthening. This segmentation allows the majority of the structure to use thinner sheets with lighter-weight spot welding, while only the critical lashing hook mounting area receives additional reinforcement.
Solution Approach 2:
Instead of uniformly thickening the entire steel sheet structure to accommodate arc welding, the reinforcement is applied locally only where the lashing hook is mounted. The reinforcing member is positioned specifically at the lashing bracket location, providing concentrated strength exactly where needed while leaving the rest of the crash box structure lightweight and thin-gauged.
2Strength
If arc welding is used to join steel sheets to ensure lashing hook support strength, then the support strength is improved, but the manufacturing cost increases
Solution Approach 1:
The manufacturing process is segmented into simpler steps: the tubular body is formed by spot welding (a faster, cheaper process), and the reinforcing member is added separately through insertion and riveting. This avoids the need for complex arc welding operations on the entire structure, reducing manufacturing cost while still achieving the required strength at the critical location.
Solution Approach 2:
The reinforcing member acts as a cost-effective, replaceable component that provides the necessary strength enhancement without requiring expensive arc welding procedures. The simple riveted connection is both cheaper to manufacture and easier to repair or replace if needed.
3Ease of manufacture
If spot welding is used to join steel sheets, then the manufacturing cost and weight are reduced, but the lashing hook support strength is insufficient
Solution Approach 1:
The solution merges two joining methods: spot welding is used to efficiently form the main tubular body structure at low cost, and riveting is used to attach the reinforcing member for strength enhancement. This combination allows the benefits of both processes to be realized: economical mass production of the body structure with targeted reinforcement where strength is critical.
Solution Approach 2:
The reinforcing member is designed to be inserted and riveted after the tubular body is formed by spot welding. This preliminary formation of the basic structure allows for cost-effective manufacturing, followed by the addition of the reinforcing element to achieve the required strength without compromising the economical spot-welded construction.
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 the deformation resistance of the lashing hook and supports the lashing hook's strength, enabling thinner steel sheets and reducing manufacturing costs and weight compared to arc welding methods.
Implementation Method 1
the lid body is joined by spot welding to the tubular body in such a manner as to cover an end portion of the tubular body and close the hollow portion
Data Source
AI summary
Provided is a crash box including a tubular body; a sheet-like lid body; a lashing bracket; and a reinforcing member, in which the tubular body defines a hollow portion in the tubular body, the lid body is joined by spot welding to the tubular body, the lashing bracket supports a lashing hook protruding from the lashing bracket and is placed in such a manner as to be placed on the lid body, and furthermore is coupled to the lid body in such a manner as to, together with the lid body, cover the end portion of the tubular body and close the hollow portion, the reinforcing member is placed along the lashing bracket in the tubular body in such a manner as to cross the hollow portion in the tubular body, and both end portions of the reinforcing member are coupled to the tubular body.