Crush box and vehicle bumper apparatus including the same

A crush box arranged between a side member of a vehicle body and a bumper reinforcement member, the crush box comprising:

• a main body portion arranged in a longitudinal direction of a vehicle and formed in a tubular shape, the main body portion including first and second portions;
• a vehicle body attaching portion arranged at a first end of the main body portion and positioned adjacent to the vehicle body relative to the main body portion;
• and
• a bumper attaching portion arranged at a second end of the main body portion and positioned adjacent to the bumper reinforcement member relative to the main body portion,
• wherein a vertical cross-section of the first portion adjacent to the vehicle body attaching portion is a polygonal shape and a vertical cross-section of the second portion adjacent to the bumper attaching portion is a circular shape,
• wherein the main body portion is an integrally formed portion, and
• wherein shapes of the vertical cross-sections of both the first portion adjacent to the vehicle body attaching portion and the second portion adjacent to the bumper attaching portion are inhibited from including projecting portions respectively, and the crush box is crushed inwardly relative to one of the first portion and the second portion in a vertical cross-sectional view in a case where the crush box is crushed.

A vehicle bumper apparatus, comprising:

• a crush box supporting a bumper reinforcement member to mount the bumper reinforcement member to a side member of a vehicle body,
• the crush box comprising:
• a main body portion arranged in a longitudinal direction of a vehicle and formed in a tubular shape, the main body portion including first and second portions;
• a vehicle body attaching portion arranged at a first end of the main body portion and positioned adjacent to the vehicle body relative to the main body portion;
• and
• a bumper attaching portion arranged at a second end of the main body portion and positioned adjacent to the bumper reinforcement member relative to the main body portion,
• wherein a vertical cross-section of the first portion adjacent to the vehicle body attaching portion is a polygonal shape and a vertical cross-section of the second portion adjacent to the bumper attaching portion is a circular or polygonal shape, and the number of vertices of the polygonal shape of the vertical cross-section of the second portion is greater than the number of vertices of the polygonal shape of the vertical cross-section of the first portion,
• wherein the main body portion of the crush box is an integrally formed portion, and
• wherein shapes of the vertical cross-sections of both the first portion adjacent to the vehicle body attaching portion and the second portion adjacent to the bumper attaching portion are inhibited from including projecting portions respectively, and the crush box is crushed inwardly relative to one of the first portion and the second portion in a vertical cross-sectional view in a case where the crush box is crushed.