Patent ID: 11952042
Assignee: MAZDA MOTOR CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
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.