Door impact beam for an automobile
AssigneeNHK Spring Co., Ltd.
InventorsShigeru Kuroda, Ken Takahashi, Hideo Akamatsu, Hidetoshi Gozu
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Abstract
A door impact beam, which is arranged in a door panel structure, comprises a beam body, arranged along the longitudinal direction of a door, and attachment portions arranged individually at two opposite ends of the beam body. The beam body is formed of a heat-treated hollow member steel. The attachment portions are individually fixed to the door panel structure. The beam body has a section in the form of a quadrilateral frame having four sides and four rounded corners. The outer radius of curvature R of each of the four corners is adjusted to a value such that the radius R falls within a range of 1.5 t.ltoreq.R.ltoreq.3.5 t, where t is the wall thickness of the hollow member.
Claims9
A door impact beam for use in a door panel structure designed for use in an automobile, the door panel structure having an outer panel and an inner panel, said door impact beam comprising;
- a beam body including a heat-treated steel hollow member having two opposite end portions;
- said beam body being arranged along a longitudinal direction of the automobile;
- said beam body having a section thereof in the form of a quadrilateral frame including:
- four side portions and four rounded corners respectively separating said four side portions, said four side portions and said four rounded corners having a common thickness;
- an outer radius of curvature R of each of said four corners being within a range of 1.5 t.ltoreq.R.ltoreq.3.5 t, where t is a wall thickness of the hollow member;
- and
- attachment portions positioned respectively at first and second opposite end portions of the beam body, said attachment portions being fixed to a structural portion of the door panel.
Dependencies are inferred from the claim text.