MOTOR VEHICLE UNDERBODY WITH REINFORCED RIGIDITY IN A MEDIAN LONGITUDINAL ZONE

The motor vehicle underbody design with reinforced stiffening parts addresses the challenge of maintaining rigidity and sealing by enhancing transverse rigidity and impact absorption without inflatable inserts, improving production efficiency and reducing costs.

FR3160151A1Pending Publication Date: 2025-09-19STELLANTIS AUTO SAS
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Patent Information

Application Number
FR2024002679
Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-03-18
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

Existing motor vehicles face challenges in maintaining transverse rigidity and sealing the underbody without using inflatable inserts, particularly when the powertrain lacks an exhaust line, leading to potential liquid ingress and increased torsion, while also needing to absorb frontal impacts effectively.

Method used

A motor vehicle underbody design with reinforced stiffening parts, including a first and second stiffening part secured to the front and central floors, and a third part ensuring continuity between them, enhancing transverse rigidity and sealing without inflatable inserts.

Benefits of technology

The design increases transverse rigidity and impact absorption capacity while ensuring sealing, simplifying production and reducing costs by eliminating the need for inflatable inserts.

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Abstract

A sub-body (SV) equips a motor vehicle and comprises: - a front floor (PV) having a first lower face and a first upper face (FS1) on which is fixedly secured, in a first median longitudinal zone (ZLM1), a first stiffening part (PR1) comprising a rear sub-part (SPR) for sealing, - a central floor (PC) having a second upper face (FS2) fixedly secured to the first lower face in a transverse interface zone (ZI) and on which is fixedly secured a second stiffening part (PR2) in a second median longitudinal zone (ZLM2) located behind the interface zone (ZI), and - a third stiffening part (PR3) partially covering the first (PR1) and second (PR2) stiffening parts and fixedly secured to the latter and to the second upper face (FS2). Figure 2
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