An impact absorbing structure includes an impact absorbing member made of CFRP, and the impact absorbing member includes a pair of left and right side wall portions and upper and lower coupling wall portions each coupling the side wall portions. Each of the pair of side wall portions includes a plurality of curved portions. Each of the curved portions is formed such that a leftward/rightward direction depth thereof decreases toward a front side. Each of the pair of side wall portions includes: a plurality of first carbon fibers arranged to extend in a forward/rearward direction and constituting most of reinforced fibers contained in the side wall portion; and a plurality of second carbon fibers arranged to extend in a direction intersecting with the first carbon fibers. The plurality of second carbon fibers are arranged at both thickness direction end vicinity parts of each of the side wall portions.

A hybrid structure, comprising: a frame member comprising at least three walls forming a channel having a convex portion where two walls meet; a concave deformation in at least one of the convex portions, wherein the concave deformation extends into the channel and has open ends forming an opening through the convex portion; and a plastic reinforcement member in the channel, wherein a portion of the reinforcement member extends into the opening and on the deformation.

A reinforcing unit that is mounted on a main body frame includes a beam material, and one or more reinforcing members that are mounted on an outside of the beam material, in which the beam material substantially has a continuously closed cross-sectional shape that includes an inner surface portion that is provided on a frame side where the main body frame is located, an outer surface portion that is provided on a counter-frame side that is a side opposite to the main body frame, and a side surface portion that connects the inner surface portion and the outer surface portion, and the reinforcing member restrains bulging deformation of the side surface portion in a case where an impact load is input to the outer surface portion.

A vehicle body front structure comprises a bumper beam provided in a front portion of a vehicle body, a hood lock member provided on a rear side and an upper side of the bumper beam, and a hood lock provided on an upper side of the hood lock member and configured to engage with a hood so that the hood can be opened/closed. The hood lock member is made of a resin. A hood lock bracket made of a metal is attached to the hood lock member. The hood lock is attached to the hood lock bracket. The hood lock bracket and the bumper beam are connected by a connecting member.

The invention relates to a bumper beam (B) comprising a main cross member (1) and a cross member part (2) fixedly attached to said main cross member (1). Said cross member part (2) forms in itself or together with one or more portions of the main cross member (1) a closed chamber (C) in a cross section of the bumper beam and is arranged at an upper side (11) or at a lower side (12) of said main cross member (1). Said closed chamber (C) abuts and extends over only a portion of said upper side (11) or said lower side (12) of said main cross member (1) as seen in the cross direction of said main cross member (1) and over essentially the entire length and in a longitudinal direction of said main cross member (1). Said main cross member (1) together with said cross member part (2) form a closed main chamber (M).

The crush can 4 is provided therein with the ribs 46 and 47 extending in the vehicle front and rear direction. The bumper beam 6 is provided therein with the ribs 66 and 67 extending in the vehicle front and rear direction. The rib 46 of the crush can 4 and the rib 66 of the bumper beam 6 are disposed at approximately the same height, and the rib 47 of the crush can 4 and the rib 67 of the bumper beam 6 are disposed at approximately the same height.

A bumper crossmember for a motor vehicle having a crossmember extending transversely to the longitudinal axis of the vehicle and two crashboxes connected thereto. Each crashbox is connected with its end facing away from the vehicle to the crossmember in a respective end section thereof, and with its end facing the vehicle is connectable to a structural component of the vehicle, e.g., a longitudinal member. The crossmember has a corrugated structure in the area where a crashbox is connected. A tow sleeve is integrated into the bumper crossmember in the connection area of the crashbox. The tow sleeve is held in a vertex structure of the corrugated structure in a form-fitting manner in the z and y directions, the vertex area of this vertex structure facing away from the crashbox, with the lateral surface of the tow sleeve on the flanks facing one another and forming the vertex structure.

A vehicle body front part structure includes: a pair of left and right front side frames extending in the vehicle front-rear direction; and a front bulkhead connected to front ends of the front side frames. The front bulkhead includes: a pair of upper and lower lateral members extending in the left-right direction; and a pair of left and right vertical members extending in the up-down direction so as to connect ends on the outer sides in the vehicle width direction of the lateral members to each other. A forward extension part extending toward the front of the vehicle is provided at a lower end of the vertical member. A first load transmission member located on a more outer side in the vehicle width direction than the front side frame is fixed to the forward extension part.

A reinforcement member has a load-receiving portion and an inclined portion. At least a part of the load-receiving portion is placed in front of a Fr side member. An end, at an inner side in the width direction, of the inclined portion matches in the width direction of the vehicle with a ridgeline at an inner side, in the width direction of the vehicle, of the Fr side member, or is provided at an outer side, in the width direction of the vehicle, in relation to the ridgeline.

A method of determining proof stress includes: calculating a needed load needed to completely crush a deformable impact absorption body of a barrier in a range that comes into contact with a rear bumper reinforcement, based on a load needed to completely crush the entire front surface of the impact absorption body, an area of the entire front surface of the impact absorption body, and an area of the front surface of the impact absorption body, which comes into contact with the rear bumper reinforcement; calculating a maximum bending moment acting on the rear bumper reinforcement in a case where the needed load is input; and determining proof stress of a pair of side members to be equal to or greater than the needed load and determining proof stress of the rear bumper reinforcement to be equal to or greater than the maximum bending moment.