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EP-4365034-B1 - REINFORCING UNIT

EP4365034B1EP 4365034 B1EP4365034 B1EP 4365034B1EP-4365034-B1

Inventors

  • FUNADA RYUICHI
  • NAM Kiwoong
  • UENO Norieda
  • KUMENO HIROYUKI
  • SAKAMAKI KOZABURO

Dates

Publication Date
20260506
Application Date
20220426

Claims (5)

  1. A reinforcing unit (10) that is mounted on a main body frame (12), comprising: a beam material (18); and one or more reinforcing members (20A, 20B) that are mounted on an outside of the beam material (18), wherein the beam material (18) has a continuously closed cross-sectional shape that includes an inner surface portion (22) that is provided on a frame side where the main body frame (12) is located, an outer surface portion (24) that is provided on a counter-frame side that is a side opposite to the main body frame (12), and a side surface portion (26A, 26B) that connects the inner surface portion (22) and the outer surface portion (24), and characterized in that the reinforcing member (20A, 20B) covers the side surface portion (26A, 26B) with a gap, and a part of the inner surface portion (22) from an outside, without being disposed at a position overlappping the outer surface portion (24), in a manner so that it comes into contact with the side surface portion (26A, 26B) and restrains bulging deformation of the side surface portion (26A, 26B) when an impact load is input to the outer surface portion (24).
  2. The reinforcing unit (10) according to claim 1, wherein the beam material (18) has a closed cross-sectional shape.
  3. The reinforcing unit (10) according to claim 1 or 2, wherein the reinforcing member (20A, 20B) is provided along the side surface portion (26A, 26B).
  4. The reinforcing unit (10) according to claim 3, wherein the reinforcing member (20A, 20B) covers the side surface portion (26A, 26B) from an outside.
  5. The reinforcing unit (10) according to any one of claims 1 to 4, wherein the beam material (18) includes a flange portion (28) that is formed at the side surface portion (26A, 26B) and protrudes outward in an up-down direction.

Description

Technical Field The present disclosure relates to a reinforcing unit. Background Art A reinforcing unit such as a bumper beam is sometimes incorporated into a structure such as a vehicle in order to reduce impact that occurs at the time of collision with an external object. The reinforcing unit usually includes a beam material that is mounted on a main body frame such as a vehicle body frame (for example, refer to PTL 1). PTL 2 discloses a bumper reinforcement comprising an elongated, channel-shaped body member with a bottom portion, sidewall portions, and an open side and a closure member closing the open side of the body member so that the bumper reinforcement has a closed cross section. The bumper reinforcement may further include a stiffener disposed inside the body member and the closure member, the stiffener having lateral portions that project toward the sidewall portions of the body member, and the stiffener being joined to the bottom portion of the body member and to the closure member. PTL 3 discloses a reinforcing element that abuts against an outside of a cross-section of an outer pillar element and does not extend over a foot portion, but over an entire central region to over an end-side head portion. PTL 4 discloses a bumper that has a hollow profile forming a cross-direction support for absorbing impact of a collision, joined to a vehicle via at least one mounting. At least one deformation insert inside the hollow profile is designed to deform in order to dampen the impact of a collision against the cross-direction support. WO 2019240214 A1 discloses a reinforcing unit according to the preamble of claim 1. Citation List Patent Literature [PTL 1] Japanese Unexamined Patent Publication No. 2003-237507[PTL 2] United States Patent Publication No. 2017/036623[PTL 3] German Patent Publication No. 102014018862[PTL 4] German Patent Publication No. 10205627 Summary of Invention Technical Problem The reinforcing unit sometimes includes, in addition to the beam material, a reinforcing member that reinforces the beam material in order to improve impact absorption performance (refer to, for example, PTL 1). The inventors of the present application have found a new idea for obtaining good impact absorption performance in such a reinforcing unit. One object of the present disclosure is to provide a technique capable of obtaining good impact absorption performance in a reinforcing unit. Solution to Problem A reinforcing unit of the present disclosure is defined by the features of claim 1. A reinforcing member of the present disclosure is a reinforcing member that is mounted on a main body frame, in which the beam material includes an inner surface portion that is provided on a frame side where the main body frame is located, an outer surface portion that is provided on a counter-frame side that is a side opposite to the main body frame, and a side surface portion that connects the inner surface portion and the outer surface portion, and the reinforcing member suppresses bulging deformation of the side surface portion in a case where an impact load is input to the outer surface portion. Advantageous Effects of Invention According to the present disclosure, it is possible to obtain good impact absorption performance in the reinforcing unit. Brief Description of Drawings Fig. 1 is a top view of a reinforcing unit of an embodiment.Fig. 2 is a sectional view taken along line II-II of Fig. 1.Fig. 3 is a diagram schematically showing a part of an end surface along line III-III of Fig. 1.Fig. 4A is an end view schematically showing a reinforcing member of a reference form.Fig. 4B is a diagram schematically showing a state where the reinforcing member of the reference form is being deformed.Fig. 4C is a diagram schematically showing a state where the reinforcing member of the reference form is being deformed.Fig. 5A is an end view schematically showing the reinforcing member of the embodiment.Fig. 5B is a first explanatory diagram schematically showing a state where the reinforcing member of the embodiment is being deformed.Fig. 5C is a second explanatory diagram schematically showing a state where the reinforcing member of the embodiment is being deformed.Fig. 5D is a third explanatory diagram schematically showing a state where the reinforcing member of the embodiment is being deformed.Fig. 6 is a schematic diagram showing a calculation model that is a prerequisite in FEM analysis.Fig. 7 is a graph showing a relationship between a reaction force obtained by the FEM analysis and a stroke amount.Fig. 8 is a configuration diagram showing a forming apparatus of the embodiment.Fig. 9A is a first explanatory diagram schematically showing a forming method of the embodiment.Fig. 9B is a second explanatory diagram schematically showing the forming method of the embodimentFig. 9C is a third explanatory diagram schematically showing the forming method of the embodiment. Description of Embodiments Hereinafter, an embodiment wi