Crash box collision damper for motor vehicle

A collision damping arrangement for a motor vehicle for absorbing energy in a collision, comprising a crashbox damper member extending longitudinally along a longitudinal axis between a first aft end and a second distally opposite forward end and longitudinally deformably compressible in response to longitudinal force application, said first end of said crashbox damper member providing a first mounting surface for mounting to said vehicle, said second end of said crashbox damper member providing a second mounting surface for mounting to a bumper-mounting surface of a bumper, said second end of said crashbox damper member having a sequenced pre-collapse surface providing sequential energy absorbing compression such that at application of longitudinal force, longitudinal compression initially occurs at said pre-collapse surface, prior to compression of the remainder of said crashbox damper member, and upon sufficient further longitudinal force, longitudinal compression of said crash box damper member occurs, wherein said second mounting surface is an arched cap in the form of a spherical segment over said second end of said crashbox damper member, and wherein said second mounting surface is said pre-collapse surface, and wherein said cap has a base transitioning aft to the remainder of said crashbox damper member aft thereof, and comprising a fold at said base, such that at application of longitudinal force, compression initially occurs at said fold, prior to compression of the remainder of said crashbox damper member.

A collision damping arrangement for a motor vehicle for absorbing energy in a collision, comprising a crashbox damper member extending longitudinally along a longitudinal axis between a first aft end and a second distally opposite forward end and longitudinally deformably compressible in response to longitudinal force application, said first end of said crashbox damper member providing a first mounting surface for mounting to said vehicle, said second end of said crashbox damper member providing a second mounting surface for mounting to a bumper-mounting surface of a bumper, said second end of said crashbox damper member having a sequenced pre-collapse surface providing sequential energy absorbing compression such that at application of longitudinal force, longitudinal compression initially occurs at said pre-collapse surface, prior to compression of the remainder of said crashbox damper member, and upon sufficient further longitudinal force, longitudinal compression of said crash box damper member occurs, wherein said crashbox damper member is a hollow member having at least three bridge areas distributed evenly around its perimeter and extending longitudinally, and at least three parallel reinforcing creases arranged between said bridge areas and extending in the direction of said perimeter and directed towards the interior of said hollow member in such a fashion that, looking from the longitudinal direction, convex areas are formed between adjacent reinforcing creases.

A collision damping arrangement for a motor vehicle for absorbing energy in a collision, comprising a crashbox damper member extending longitudinally along a longitudinal axis between a first aft end and a second distally opposite forward end and longitudinally deformably compressible in response to longitudinal force application, said first end of said crashbox damper member providing a first mounting surface for mounting to said vehicle, said second end of said crashbox damper member providing a second mounting surface for mounting to a bumper-mounting surface of a bumper, said second end of said crashbox damper member having a sequenced pre-collapse surface providing sequential energy absorbing compression such that at application of longitudinal force, longitudinal compression initially occurs at said pre-collapse surface, prior to compression of the remainder of said crashbox damper member, and upon sufficient further longitudinal force, longitudinal compression of said crash box damper member occurs, wherein said second mounting surface is said pre-collapse surface, and wherein said second mounting surface has a frontmost leading edge over said second end of said crashbox damper member, said crashbox damper member having a fold spaced longitudinally aft of said frontmost leading edge of said second mounting surface by a given longitudinal distance, such that at application of longitudinal force, compression initially occurs at said fold, prior to compression of the remainder of said crashbox damper member.

A collision damping arrangement for a motor vehicle for absorbing energy in a collision, comprising a crashbox damper member extending longitudinally along a longitudinal axis between a first aft end and a second distally opposite forward end and longitudinally deformably compressible in response to longitudinal force application, said first end of said crashbox damper member providing a first mounting surface for mounting to said vehicle, said second end of said crashbox damper member providing a second mounting surface for mounting to a bumper-mounting surface of a bumper, said second end of said crashbox damper member having a sequenced pre-collapse surface providing sequential energy absorbing compression such that at application of longitudinal force, longitudinal compression initially occurs at said pre-collapse surface, prior to compression of the remainder of said crashbox damper member, and upon sufficient further longitudinal force, longitudinal compression of said crash box damper member occurs, wherein said pre-collapse surface has a frontmost leading edge over said second end of said crashbox damper member, said crashbox damper member has a fold spaced longitudinally aft of said frontmost leading edge by a given longitudinal distance, such that at application of longitudinal force, compression initially occurs at said fold, prior to compression of the remainder of said crashbox damper member, and said crashbox damper member has an outer jacket having a plurality of longitudinally extending ribs at said second end aft of said fold.