US-12617473-B2 - Vehicle body floor structure

US12617473B2US 12617473 B2US12617473 B2US 12617473B2US-12617473-B2

Abstract

The vehicle body floor structure includes a floor including a front panel located at front and a rear panel located at rear and formed at a position above the front panel; lower longitudinal beams located on both sides of the floor in a vehicle width direction; a floor cross beam connected to the lower longitudinal beams on outer sides in the vehicle width direction; and a floor tunnel connected to a center of the floor cross beam in the vehicle width direction. The floor cross beam includes a step portion above the floor tunnel, and the step portion is curved upward while extending from both ends toward the center as a whole when viewed from a front angle between the lower longitudinal beams.

Inventors

Taiki TERUI
Shungo Chino

Assignees

HONDA MOTOR CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20240104
Priority Date: 20230321

Claims (8)

1 . A vehicle body floor structure, comprising: a floor comprising a front panel located at front and a rear panel located at rear and formed at a position above the front panel; lower longitudinal beams located on both sides of the floor in a vehicle width direction; a floor cross beam connected to the lower longitudinal beams on outer sides in the vehicle width direction; and a floor tunnel connected to a center of the floor cross beam in the vehicle width direction, wherein the floor cross beam comprises a step portion above the floor tunnel, and the step portion is curved upward while extending from both ends toward the center as a whole when viewed from a front angle between the lower longitudinal beams.
2 . The vehicle body floor structure according to claim 1 , wherein the floor cross beam comprises an upper member and a lower member, and the upper member and the lower member form a closed cross section, the lower member comprises a lower wall forming a lower portion of the closed cross section and a rear wall forming a rear portion of the closed cross section, and the rear wall of the lower member extends upward from the closed cross section and is joined to a front edge of the rear panel.
3 . The vehicle body floor structure according to claim 2 , wherein the upper member comprises a front wall forming a front portion of the closed cross section and an upper wall forming an upper portion of the closed cross section, and the step portion is formed by the front wall and the upper wall, and the front wall has a ridge line that extends from a vehicle width outer end toward the floor tunnel at a height of the floor tunnel.
4 . The vehicle body floor structure according to claim 2 , wherein the step portion comprises a top portion at a center in the vehicle width direction where the floor cross beam and the floor tunnel are connected, and the top portion is highest in height from the front panel.
5 . The vehicle body floor structure according to claim 4 , wherein an upper edge of the rear wall comprises a curved portion, which is curved downward toward the lower longitudinal beam, between the top portion and an outer end of the floor cross beam in the vehicle width direction.
6 . The vehicle body floor structure according to claim 2 , wherein the rear wall comprises an inclined portion that is inclined forward toward the lower wall.
7 . The vehicle body floor structure according to claim 2 , wherein when viewed from a bottom of a vehicle body, the lower member comprises a recessed portion that is recessed upward toward the vehicle body at a center in the vehicle width direction, the recessed portion is formed along an opening cross section of the floor tunnel and is connected to the opening cross section of the floor tunnel, and the recessed portion comprises a widened portion expanding outward in the vehicle width direction on a rear side in a vehicle length direction.
8 . The vehicle body floor structure according to claim 1 , wherein the rear panel comprises a rear side frame on an outer side in the vehicle width direction, the rear side frame and the floor cross beam are separated from each other in a vehicle length direction, and the lower longitudinal beam comprises a connecting member for connecting the rear side frame and the floor cross beam.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the priority benefits of China application no. 202310278848.X, filed on Mar. 21, 2023. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. BACKGROUND Technical Field The disclosure relates to a vehicle body floor structure. Description of Related Art In recent years, efforts have been made to provide sustainable transportation systems that take into account vulnerable people such as the elderly and children among traffic participants. In order to achieve the above purpose, research and development related to vehicle body rigidity are being carried out, aiming to further improve traffic safety and convenience. Patent Document 1 (Japanese Patent No. 6631472) discloses a vehicle body floor structure equipped with an Intelligent Power Unit (IPU). The intelligent power unit includes components such as a power battery and management system, a motor controller, a DC power supply or DC power converter, and a cooling system, which are unique components of a hybrid electric vehicle. In Patent Document 1, the intelligent power unit is placed under the rear seats and protected by a ring frame composed of a floor cross beam and a rear side frame. However, as the floor cross beam is connected to a floor tunnel on the center side, the cross section on the center side becomes smaller and may not be able to fully support the load during a side collision. Furthermore, since the floor tunnel merges with the floor cross beam, the cross section of the floor cross beam is reduced and offset, making it more easily deformed. An embodiment of the disclosure provides a vehicle body floor structure which has favorable rigidity and is capable of suppressing deformation. SUMMARY An embodiment of the disclosure provides a vehicle body floor structure, including a floor including a front panel located at front and a rear panel located at rear and formed at a position above the front panel; lower longitudinal beams located on both sides of the floor in a vehicle width direction; a floor cross beam connected to the lower longitudinal beams on outer sides in the vehicle width direction; and a floor tunnel connected to a center of the floor cross beam in the vehicle width direction. The floor cross beam includes a step portion above the floor tunnel, and the step portion is curved upward while extending from both ends toward the center as a whole when viewed from a front angle between the lower longitudinal beams. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view of a vehicle body floor structure according to an embodiment of the disclosure. FIG. 2 is a schematic front view of the vehicle body floor structure of FIG. 1. FIG. 3 is a schematic cross-sectional view of the vehicle body floor structure of FIG. 1 from the perspective of FIG. 1. FIG. 4 is a schematic side cross-sectional view of the vehicle body floor structure of FIG. 1. FIG. 5 is a schematic perspective view of the vehicle body floor structure of FIG. 1 with the rear panel removed. FIG. 6 is a schematic bottom view of the vehicle body floor structure of FIG. 1. DESCRIPTION OF THE EMBODIMENTS An embodiment of the disclosure provides a vehicle body floor structure, including a floor including a front panel located at front and a rear panel located at rear and formed at a position above the front panel; lower longitudinal beams located on both sides of the floor in a vehicle width direction; a floor cross beam connected to the lower longitudinal beams on outer sides in the vehicle width direction; and a floor tunnel connected to a center of the floor cross beam in the vehicle width direction. The floor cross beam includes a step portion above the floor tunnel, and the step portion is curved upward while extending from both ends toward the center as a whole when viewed from a front angle between the lower longitudinal beams. In an embodiment of the disclosure, the floor cross beam includes an upper member and a lower member, and the upper member and the lower member form a closed cross section. The lower member includes a lower wall forming a lower portion of the closed cross section and a rear wall forming a rear portion of the closed cross section, and the rear wall of the lower member extends upward from the closed cross section and is joined to a front edge of the rear panel. In an embodiment of the disclosure, the upper member includes a front wall forming a front portion of the closed cross section and an upper wall forming an upper portion of the closed cross section. The step portion is formed by the front wall and the upper wall, and the front wall has a ridge line that extends from a vehicle width outer end toward the floor tunnel at a height of the floor tunnel. In an embodiment of the disclosure, the step portion includes a top portion at a center in the vehicle width direction where the floor cross beam