Bumper for a motor vehicle

A bumper for a motor vehicle with a cross member, the cross member comprising:

• a shell body and a closing plate arranged on the front of the shell body,
• wherein the shell body is configured with a U-shaped cross section with a rear wall as well as an upper leg and a lower leg and the cross member has a central longitudinal portion and end portions, wherein the shell body has a width and a height in the central longitudinal portion and the shell body has a height and a width in an end portion,
• wherein the height measured in the vehicle's vertical axis (z-axis) between an outside of the upper leg and an outside of the lower leg and the width in the vehicle's longitudinal axis is measured from the front of the shell body to an outside of the rear wall of the shell body and wherein the height in the central longitudinal portion is smaller than the height in the end portion and the width in the central longitudinal portion is larger than the width in the end portion and the shell body has a width and a height in the central longitudinal portion and the shell body has a height and a width in an end portion,
• wherein, in the central longitudinal portion, a ratio of width to height is greater than the ratio of width to height in an end portion, and a transition portion is provided between the central longitudinal portion and an end portion, which transition portion, starting from the central longitudinal portion, has an increasing height and a decreasing width, as well as the shell body has an outwardly directed upper front web adjoining the upper leg and an outwardly directed lower front web adjoining the lower leg in the central longitudinal portion, and
• wherein the closing plate rests against the front webs and is joined thereto and the closing plate has in at least one end portion a frame portion pointing towards the rear wall of the shell body, and the frame portion rests in the end portion on the upper leg or on the lower leg of the shell body and is joined thereto.