BUMPER CRUSH TOWER WITH RINGS OF VARIED STRENGTH

申请公布号：WO2003026382(A2)

申请号：US2002030684

申请日期：2002.09.26

申请公布日期：2003.04.03

摘要：<p>An energy-absorbing crush tower (13) for a vehicle bumper system (10) includes a tube made of a continuous continuous material, such as a heat-treatable steel. The tube has first and second ring sections (14, 15) connected by an interconnecting section (16). The first ring section is heat-treated to a high material strength, such as about 120 KSI tensile strength, which is substantially higher than the second ring section, which is kept at about 60 KSI tensile strength. The interconnecting section (16) has a frustoconically-shaped portion (17) forming a ramp. By this arrangement, upon the bumper system (10) receiving an end impact parallel a length of the tube, the first and second ring sections (14, 15) telescopingly collapse with a predictable and consistent multi-phase deformation sequence where a third ring section (18) forms between the first and second ring sections.</p>

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