US 11,952,042 B2
Lower vehicle-body structure of vehicle
Mikado Kawasaki, Hiroshima (JP); Hirotaka Natsume, Hiroshima (JP); Keisuke Ebisumoto, Hiroshima (JP); Akiko Nakamoto, Hiroshima (JP); Daisuke Tsuji, Hiroshima (JP); and Kento Otsuka, Hiroshima (JP)
Assigned to MAZDA MOTOR CORPORATION, Hiroshima (JP)
Filed by Mazda Motor Corporation, Hiroshima (JP)
Filed on Apr. 12, 2022, as Appl. No. 17/718,339.
Claims priority of application No. 2021-077947 (JP), filed on Apr. 30, 2021.
Prior Publication US 2022/0348262 A1, Nov. 3, 2022
Int. Cl. B62D 21/15 (2006.01); B62D 25/02 (2006.01); B62D 25/20 (2006.01); B62D 27/02 (2006.01)
CPC B62D 21/157 (2013.01) [B62D 25/025 (2013.01); B62D 25/20 (2013.01); B62D 25/2036 (2013.01); B62D 27/023 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A lower vehicle-body structure of a vehicle, the lower vehicle-body structure comprising:
a floor panel that constitutes a floor face portion of the vehicle;
a side sill that extends in a vehicle front-rear direction on a vehicle-width-direction end portion of the vehicle; and
a frame member that extends in a front-rear direction on a vehicle-width-direction inner side of the side sill and forms a closed cross-section together with the floor panel by being joined to the floor panel in an up-down direction, the frame member including a front-rear extended portion that is in abutment against the side sill on the vehicle-width-direction inner side and extends in the vehicle front-rear direction along the side sill, wherein
the front-rear extended portion includes:
a first face portion that faces the floor panel in the up-down direction;
an inner wall portion that extends toward the floor panel from an inner end portion of the first face portion in a vehicle width direction; and
an inner-side flange that extends to the vehicle-width-direction inner side from a distal end portion of the inner wall portion and is joined to the floor panel,
a deformation facilitator that facilitates deformation of the first face portion in the vehicle width direction when a collision load in the vehicle width direction is input is formed in the first face portion, and
a compression strength of a portion of the floor panel that forms a closed cross-section together with the front-rear extended portion to the vehicle-width-direction inner side is equivalent to a compression strength of the first face portion.