Vehicle lower part structure

The vehicle understructure addresses the challenge of achieving flame retardancy at a lower cost by using a dual-member intermediate system with varying flame retardancy and heat management features, ensuring effective protection and cost efficiency.

JP2025131252APending Publication Date: 2025-09-09TOYOTA JIDOSHA KK
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Patent Information

Application Number
JP2024028875
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-02-28
Publication Date
2025-09-09

AI Technical Summary

Technical Problem

Existing vehicle understructures with electricity storage devices face challenges in achieving flame retardancy at a lower cost, as flame retardant members are often expensive.

Method used

The vehicle understructure incorporates an intermediate member with first and second members, where the first member overlaps with seats vertically and has higher flame retardancy, while the second member does not overlap and uses less expensive flame-retardant resin, and includes a metal sheet to disperse heat and an expansion member to increase distance from the storage device.

Benefits of technology

This configuration achieves flame retardancy at a lower cost by optimizing resin use and heat management, preventing heat transfer to occupants and enhancing flame retardant effects.

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Abstract

To provide a vehicle lower part structure that is able to achieve flame retardancy at a lower cost.SOLUTION: A vehicle lower part structure 10 includes: a floor carpet 14; an intermediate member 20 disposed below the floor carpet 14; a power storage device 40 disposed below the intermediate member 20; and a seat 11 disposed above the floor carpet 14. The intermediate member 20 includes: a first member 21A overlapping the seat in a vertical direction; and a second member 22A having an overlap portion 24 overlapping the seat in the vertical direction and a non-overlap portion 23 not overlapping the seat in the vertical direction. Flame retardancy of the first member 21A is higher than flame retardancy of the second member 22A.SELECTED DRAWING: Figure 5
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