JP4425534B2

JP4425534B2 - Bumper mounting device

Info

Publication number: JP4425534B2
Application number: JP2002273918A
Authority: JP
Inventors: 賢司豊田
Original assignee: Press Kogyo Co Ltd
Current assignee: Press Kogyo Co Ltd
Priority date: 2002-09-19
Filing date: 2002-09-19
Publication date: 2010-03-03
Anticipated expiration: 2022-09-19
Also published as: JP2004106759A

Description

【０００１】
【発明の属する技術分野】
本発明は、バンパ類、特にＦＵＰ（フレーム下潜り込み防止部材）のフレームへの取付装置に関する。
【０００２】
【従来の技術】
前記ＦＵＰ（ＦｒｏｎｔＵｎｄｅｒｒｕｎＰｒｏｔｅｃｔｉｏｎ）は、大型トラックへの乗用車等の追突時に、該乗用車等が大型トラックの下に潜り込んで大事故につながることを防止しようとする一種のバンパである。
【０００３】
ＦＵＰは現在鋭意研究中であるが、多くは角形又は円形の閉断面をなし、内部に補強部材を内蔵して衝突時の圧潰に対応しようとしている。そして、該ＦＵＰは図１の１で示すように、トラックのフレームＦに支持した支持腕２の先端に、後記取付ブラケットを介して取付けられる予定である。
【０００４】
前記取付ブラケットとしては、一例としてリヤバンパ等でも使用されていた図５以下に示すごときものを使用することが考えられている。即ちこの取付ブラケット３は、コ字状に形成された本体部３ａの両端にフランジ部３ｂを一体に形成した、厚さ４．５〜６ミリメートルの鋼板部材で、上記フランジ部３ｂを前記ＦＵＰ１’の裏面の所定位置に溶接Ｗで固着し、前記本体部３ａを、ボルト穴３ｃに通したボルト（図示せず）により前記支持腕２の先端に固定したものである。
【０００５】
ところが、上記のようなブラケット３では、図６のＡ−Ａ断面とＢ−Ｂ断面における断面係数の差が例えば約１対２と大きいため、厳しい荷重条件下での衝撃力Ｐ1によって本体部３ａとフランジ部３ｂとの境界に相当するＱ点に応力集中が生じ、図７に示すようにＱ点でＦＵＰ１’とともに屈曲することがあり、ブラケット３がＦＵＰ１’を補強する効果が十分発揮されないおそれがある。
【０００６】
また図８に示すように、衝撃力Ｐ1によってＦＵＰ１が屈曲するとともに、ブラケット３が潰れてしまうことがある。そして、前記ブラケット３の補強効果を期待せず、ＦＵＰ１自体に必要剛性を持たせようとしてその全長にわたり内部に補強を施すことも考えられるが、これでは大きな重量増加に繋がりやすい。
【０００７】
【発明が解決しようとする課題】
よって、本発明の解決しようとする課題は、応力集中を緩和でき且つバンパ類の強度を補完する取付ブラケットを備えた、バンパ類の取付装置を提供することにある。
【０００８】
【課題を解決するための手段】
上記課題を解決するための本発明バンパ類の取付装置は、閉断面をもつバンパ類を、フレームに支持した支持腕先端に取付けるに際し、取付時の平面視で台形をなし、且つ側面視で垂直で平らな頂部を備えた山形ボックス状の突部をもち、頂部と反対側の両端にコ字断面をもつ開口部を形成した取付ブラケットを用い、前記開口部をフレーム側から前記バンパ類に被せて溶接するとともに、前記ボックス状突部の頂部を前記支持腕の先端に装着したことを特徴とするものである。
【０００９】
【発明の実施の形態】
本発明の好ましい実施の形態を、図１乃至図４により説明すると、本発明バンパ類の取付装置は、閉断面をもつバンパ類を、フレームＦに支持した支持腕２先端２ａに取付けるに際し、取付時の平面視で台形をなし、且つ側面視で垂直で平らな頂部１２ｂを備えた山形ボックス状の突部１２ｄをもち、頂部１２ｂと反対側の両端にコ字断面をもつ開口部１２ａを形成した取付ブラケット１２を用い、前記開口部１２ａをフレームＦ側から前記バンパ類１１に被せて溶接Ｗするとともに、前記ボックス状突部の頂部１２ｂを前記支持腕２の先端２ａに装着したものである。
【００１０】
図１乃至図４に示す実施例について更に詳細に説明する。
図に示す取付ブラケット１２は、取付時の平面視では、緩やかな斜面の台形をなし、且つ側面視では、垂直で平らな頂部１２ｂを備えたボックス状の突部１２ｄをもっており、頂部１２ｂと反対側にコ字断面の開口部１２ａを形成している。そして、前記頂部１２ｂにはボルト穴１２ｃが形成され、該穴１２ｃに合わせて頂部１２ｂの内側にナット１３が固着されている。
【００１１】
コ字形断面の開口部１２ａの深さは、バンパ類（ＦＵＰ）１の上下面の厚さの、例えば１／２とする。また、ＦＵＰ１１が図４の如く左右端付近で屈曲したものでは、屈曲位置のところで切断すればよい。更に負荷または荷重条件によっては、図２、図３の仮想線の如くリブ片１４を取付ブラケット１２内面に合わせて形成してもよい。
【００１２】
上記のように形成した取付ブラケット１２は、所定位置において、前記開口部１２ａをフレームＦ側から前記ＦＵＰ１１にかぶせて溶接等Ｗで固定し、次いで左右両側にブラケット１２を取付けたＦＵＰ１１を前記支持腕２の先端２ａにボルト（図示せず）で固着する。
【００１３】
このように構成した本発明取付装置において、ＦＵＰ１１に衝撃荷重Ｐ1がかかったときは、その荷重は断面変化が緩やかな斜面のボックス状の取付ブラケット１２を経て、頂部１２ｂから前記支持腕２の先端に伝達され、従って、応力集中を生ずることなしに荷重は支持腕２を介してフレームＦに円滑に伝達される。
【００１４】
【発明の効果】
本発明バンパ類の取付装置は、閉断面をもつバンパ類を、フレームに支持した支持腕先端に取付けるに際し、取付時の平面視で台形をなし、且つ側面視で垂直で平らな頂部を備えた山形ボックス状の突部をもち、頂部と反対側の両端にコ字断面をもつ開口部を形成した取付ブラケットを用い、前記開口部をフレーム側から前記バンパ類に被せて溶接するとともに、前記ボックス状突部の頂部を前記支持腕の先端に装着したことを特徴とするので、取付時の平面視で台形をなす取付ブラケットにより衝突時の応力集中を緩和して、バンパ類、取付ブラケットの屈曲等を防ぐことができる。
【００１５】
また、平面視台形の本発明取付ブラケットを、その開口部をフレーム側から前記バンパ類に被せて固定したことにより、バンパ類の強度を補完する効果もある。実験によれば、上記補完効果によって取付ブラケットの板厚を１ランク下のものとすることができた。
【図面の簡単な説明】
【図１】本発明バンパ類の取付装置の斜視図
【図２】本発明バンパ類の取付装置の要部の斜視図
【図３】本発明バンパ類の取付装置の要部の平面図
【図４】本発明バンパ類の取付装置の変形例を示す要部の平面図
【図５】従来のバンパ類の取付装置の要部の斜視図
【図６】従来のバンパ類の取付装置の要部の平面図
【図７】従来のバンパ類の取付装置の要部の荷重による変形例を示す平面図
【図８】従来のバンパ類の取付装置の要部の荷重による他の変形例を示す平面図。
【符号の説明】
１、１１ＦＵＰ、バンパ類２支持腕２ａ（支持腕の）先端
３、１２取付ブラケット１２ａ（取付ブラケットの）開口部
１２ｂ（同）頂部１２ｃ（同）ボルト穴
１２ｄボックス状の突部１３ナット１４リブ片
Ｆフレーム。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting device for a bumper, in particular, a FUP (frame under-intrusion prevention member) to a frame.
[0002]
[Prior art]
The FUP (Front Underrun Protection) is a type of bumper that attempts to prevent a passenger car or the like from entering a large truck and causing a major accident at the time of a rear-end collision of the passenger car or the like on a large truck.
[0003]
FUPs are currently under intense research, but many have square or circular closed cross-sections, and have built-in reinforcing members to cope with crushing during a collision. The FUP is scheduled to be attached to the tip of the support arm 2 supported on the frame F of the truck via a mounting bracket as described later, as indicated by 1 in FIG.
[0004]
As the mounting bracket, for example, it is considered to use one as shown in FIG. That is, the mounting bracket 3 is a steel plate member having a thickness of 4.5 to 6 mm in which flange portions 3b are integrally formed at both ends of a body portion 3a formed in a U-shape, and the flange portion 3b is connected to the FUP 1 ′. The main body 3a is fixed to the tip of the support arm 2 with a bolt (not shown) passed through a bolt hole 3c.
[0005]
However, in the bracket 3 as described above, since the difference in section modulus between the AA cross section and the BB cross section of FIG. 6 is as large as about 1: 2, for example, the main body 3a is affected by the impact force P1 under severe load conditions. Stress concentration occurs at the point Q corresponding to the boundary between the flange 3b and the FUP 1 'may be bent at the point Q as shown in FIG. 7, and the bracket 3 may not sufficiently exert the effect of reinforcing the FUP 1'. There is.
[0006]
Further, as shown in FIG. 8, the FUP 1 may be bent by the impact force P1, and the bracket 3 may be crushed. In addition, it is conceivable to reinforce the entire length of the FUP 1 itself without expecting the reinforcing effect of the bracket 3 so that the FUP 1 itself has the necessary rigidity, but this tends to lead to a large increase in weight.
[0007]
[Problems to be solved by the invention]
Therefore, the problem to be solved by the present invention is to provide a mounting apparatus for bumpers, which includes a mounting bracket that can relieve stress concentration and complement the strength of the bumpers.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the bumper mounting device of the present invention has a trapezoidal shape in a plan view and a vertical view in a side view when mounting bumpers having a closed cross section on the tip of a support arm supported by a frame. in having a chevron box-shaped protrusion with a flattened top portion, with a mounting bracket to form an opening having opposite ends in a U-shaped cross section on the side opposite to the apex, covering the opening from the frame side to the bumper such And the top of the box-like protrusion is attached to the tip of the support arm.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described with reference to FIGS. 1 to 4. The bumper mounting apparatus according to the present invention is mounted when a bumper having a closed cross section is mounted on the support arm 2 tip 2 a supported by the frame F. An opening 12a having a chevron box-shaped protrusion 12d having a trapezoidal shape in a plan view and a vertical and flat top portion 12b in a side view and having a U-shaped cross section at both ends opposite to the top portion 12b is formed. Using the mounting bracket 12, the opening 12 a is covered with the bumpers 11 from the frame F side and welded W, and the top portion 12 b of the box-shaped protrusion is attached to the tip 2 a of the support arm 2. .
[0010]
The embodiment shown in FIGS. 1 to 4 will be described in more detail.
The mounting bracket 12 shown in the figure has a trapezoidal shape with a gentle slope in a plan view at the time of mounting, and has a box-shaped protrusion 12d having a vertical and flat top portion 12b in a side view, opposite to the top portion 12b. An opening 12a having a U-shaped cross section is formed on the side. A bolt hole 12c is formed in the top portion 12b, and a nut 13 is fixed to the inside of the top portion 12b in accordance with the hole 12c.
[0011]
The depth of the opening 12a having a U-shaped cross section is, for example, ½ of the thickness of the upper and lower surfaces of the bumpers (FUP) 1. If the FUP 11 is bent near the left and right ends as shown in FIG. 4, it may be cut at the bent position. Further, depending on the load or load condition, the rib piece 14 may be formed on the inner surface of the mounting bracket 12 as shown in phantom lines in FIGS.
[0012]
The mounting bracket 12 formed as described above is fixed at the predetermined position with the opening 12a covering the FUP 11 from the frame F side by welding or the like W, and then the FUP 11 with the bracket 12 mounted on both the left and right sides is supported by the support arm. 2 is fixed to the tip 2a of the bolt 2 with a bolt (not shown).
[0013]
In the mounting device of the present invention configured as described above, when an impact load P1 is applied to the FUP 11, the load passes through the box-shaped mounting bracket 12 having a slope with a gentle cross-sectional change, and passes from the top portion 12b to the tip of the support arm 2. Therefore, the load is smoothly transmitted to the frame F through the support arm 2 without causing stress concentration.
[0014]
【The invention's effect】
The mounting apparatus for bumpers of the present invention has a trapezoidal shape in a plan view at the time of mounting and a vertical and flat top portion in a side view when mounting bumpers having a closed cross section on the tip of a support arm supported by a frame. It has a chevron box-shaped protrusion, using a mounting bracket which forms an opening portion having a U-shaped cross section at both ends of the opposite side of the apex, as well as welding the opening is covered from the frame side to the bumper such, the box Since the top of the protrusion is attached to the tip of the support arm, the mounting bracket is trapezoidal in a plan view during mounting, reducing stress concentration during collision and bending of bumpers and mounting brackets. Etc. can be prevented.
[0015]
Further, the mounting bracket of the present invention having a trapezoidal shape in plan view has an effect of complementing the strength of the bumpers by fixing the opening of the bracket over the bumpers from the frame side. According to experiments, the plate thickness of the mounting bracket can be lowered by one rank due to the above-described complementary effect.
[Brief description of the drawings]
FIG. 1 is a perspective view of a mounting device for a bumper of the present invention. FIG. 2 is a perspective view of a main portion of the mounting device for a bumper of the present invention. FIG. 5 is a perspective view of a main part of a conventional bumper mounting apparatus. FIG. 6 is a main part of a conventional bumper mounting apparatus. FIG. 7 is a plan view showing a modification of the main part of the conventional bumper mounting apparatus according to the load. FIG. 8 is a plan view showing another modification of the conventional bumper mounting apparatus according to the load. Figure.
[Explanation of symbols]
1, 11 FUP, bumpers 2 Support arm 2a (support arm) tip 3, 12 Mounting bracket 12a (Mounting bracket) opening 12b (Same) Top 12c (Same) Bolt hole 12d Box-shaped protrusion 13 Nut 14 Rib piece F frame.

Claims

When attaching bumpers having a closed cross section to the tip of the support arm supported by the frame, the bumper has a trapezoidal shape in a plan view at the time of attachment, and has a mountain- shaped box-shaped protrusion with a vertical flat top in a side view, Using mounting brackets having openings having U-shaped cross sections at both ends opposite to the top, welding the opening over the bumpers from the frame side, and attaching the top of the box-shaped protrusion to the support arm A mounting device for bumpers characterized by being attached to the tip of the bumper.