Underrun Protection Stiffness via Multiplexed Panels
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Solution Overview
Problem
The existing underrun protection systems, particularly those using steel, face challenges in maintaining strength and stiffness while minimizing weight and cost, and are prone to buckling when made with thin steel plates.
Innovation Solution
A structure comprising a multiplexed panel part formed by overlapping channel-shaped steel plates, with a reinforcing panel contacting the inner faces of the distal and proximal panels, and fastened through installation holes, enhances stiffness and prevents buckling, using ultrahigh tensile strength steel plates to maintain strength and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If thin steel plates are used to reduce weight, then weight is reduced, but buckling resistance deteriorates
Solution Approach 1:
The patent uses ultrahigh tensile strength steel plates (with tensile strength of 980 MPa or more) as a composite material solution. This high-strength steel enables the use of thinner plates (3-5 mm) while maintaining sufficient buckling resistance and structural strength, thus resolving the contradiction between weight reduction and buckling resistance.
Solution Approach 2:
The patent applies local quality by creating multiplexed panel parts with overlapping panels at specific locations where buckling is most likely to occur. The overlapping structure provides localized reinforcement without increasing the overall thickness or weight of the entire underrun protection structure.
2Weight of moving object
If aluminum material is used to reduce weight, then weight is reduced, but production cost increases
Solution Approach 1:
The patent changes the material parameter from conventional steel or aluminum to ultrahigh tensile strength steel with tensile strength of 980 MPa or more. This parameter change enables weight reduction comparable to aluminum while maintaining lower production costs and better manufacturability through conventional steel processing techniques.
3Strength
If conventional steel is used to ensure strength, then strength is maintained, but weight increases
Solution Approach 1:
The patent changes the steel grade parameter to ultrahigh tensile strength steel (980 MPa or more), which provides sufficient strength for underrun protection while enabling the use of thinner plates and thus reducing overall weight.
Solution Approach 2:
The patent applies local quality through multiplexed overlapping panel structures at critical locations, providing localized strength enhancement that allows the use of thinner overall plate gauge while maintaining required strength levels.
Data Source
AI summary
A structure of an underrun protection bound to a plurality of brackets disposed at the front or rear portion of a frame of a vehicle is disclosed. A distal panel being disposed on a distal side of a longitudinal direction of the vehicle is bound to a proximal panel being disposed on a proximal side of the longitudinal direction at engaged overlapping parts each at which an edge of a flange of the distal panel is in contact with an edge of a flange of the proximal panel. A reinforcing panel is disposed at a binder part in a hollow, the underrun protection bound to the plurality of brackets at a plurality of the binder parts such that the reinforcing panel is in contact with the inner face of one of the proximal panel and the distal panel and is in contact with the engaged overlapping part.