JPH02286488A - Rear arm for motorcycle - Google Patents
Rear arm for motorcycleInfo
- Publication number
- JPH02286488A JPH02286488A JP10959989A JP10959989A JPH02286488A JP H02286488 A JPH02286488 A JP H02286488A JP 10959989 A JP10959989 A JP 10959989A JP 10959989 A JP10959989 A JP 10959989A JP H02286488 A JPH02286488 A JP H02286488A
- Authority
- JP
- Japan
- Prior art keywords
- arm
- pipe
- cross
- rear arm
- motorcycle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000725 suspension Substances 0.000 claims abstract description 12
- 238000000748 compression moulding Methods 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 abstract description 19
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 7
- 238000005266 casting Methods 0.000 abstract description 5
- 230000003014 reinforcing effect Effects 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 3
- 238000001125 extrusion Methods 0.000 abstract 1
- 239000012778 molding material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 239000011324 bead Substances 0.000 description 9
- 238000005452 bending Methods 0.000 description 9
- 238000009826 distribution Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 210000000245 forearm Anatomy 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002828 fuel tank Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K25/00—Axle suspensions
- B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
- B62K25/06—Axle suspensions for mounting axles resiliently on cycle frame or fork with telescopic fork, e.g. including auxiliary rocking arms
- B62K25/10—Axle suspensions for mounting axles resiliently on cycle frame or fork with telescopic fork, e.g. including auxiliary rocking arms for rear wheel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Cycles, And Cycles In General (AREA)
- Axle Suspensions And Sidecars For Cycles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は自動二輪車のリヤアームに関し、特に荷重の作
用状態（曲げモーメント分布）に応じた適切な曲げ剛性
分布を有するとともに、溶接ビードによる応力集中、軟
化部等がなく、強度上の信鯨性を向上できるようにした
りャアームに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rear arm of a motorcycle, and in particular has an appropriate bending stiffness distribution according to the load acting state (bending moment distribution), and also has a stress concentration due to a weld bead. This invention relates to an arm that has no softening parts and can improve reliability in terms of strength.
自動二輪車のリヤアームは、その前端部が車体フレーム
に枢支され、後端部に後輪が軸支され、その中程に後輪
懸架装置のリンク機構が接続されるのが一般的である。Generally, the front end of the rear arm of a motorcycle is pivotally supported by the vehicle body frame, the rear wheel is pivotally supported at the rear end, and the link mechanism of the rear wheel suspension is connected to the middle of the rear arm.
従って、自動二輪車のリャア°−ムは荷重の作用状態か
ら見ると、両端が支持され、その中程に集中荷重が作用
した梁になっており、従って曲げモーメントは上記リン
ク機構接続部分で最大となり、前、後端側ほど直線的に
小さくなっている。従ってリヤアームは、曲げ剛性が上
記リンク機構接続部分で最大となり、その前。Therefore, when viewed from the load acting state, the frame of a motorcycle is a beam with both ends supported and a concentrated load acting in the middle. Therefore, the bending moment is maximum at the connection part of the link mechanism. , the size decreases linearly toward the front and rear ends. Therefore, the bending rigidity of the rear arm is maximum at the link mechanism connection part, and before that.
後端側ほど小さくなる断面形状、つまり前、後端側ほど
小さい断面積（断面係数）を有する形状のものが、強度
上、及び重量軽減上合理的である。A cross-sectional shape that becomes smaller toward the rear end, that is, a shape that has a smaller cross-sectional area (section modulus) toward the front and rear ends is reasonable in terms of strength and weight reduction.
上記要請に応えられるリヤアームとして、従来例えば、
鋳造製テーパ角管からなるものがある。For example, conventional rear arms that meet the above requirements include:
Some are made of cast tapered rectangular tubes.
これは、横断面角形で、かつ前、後端側ほど断面高さが
小さくなっており、曲げ剛性の面から見れば合理的であ
る。しかし鋳造製の場合、鋳造技術上、肉厚がある程度
厚くなり、重量軽減効果が阻害される問題がある。This is reasonable in terms of bending rigidity because it has a rectangular cross-sectional shape and the cross-sectional height decreases toward the front and rear ends. However, in the case of casting, the wall thickness becomes thick to some extent due to casting technology, which hinders the weight reduction effect.
そこで溶接製のリヤアームとして、例えば特開昭５７−
１１７７８号公報の第８図、９図に記載されているよう
に、角パイプの一部を切り欠き、残りを溶接接続するこ
とにより製造したものがある。この公報のリヤアームは
、後端側ほど断面高さが低くなっていることから上述の
荷重分布に応じた曲げ剛性分布を有しており、かつ肉厚
は通常の押し出し管と同一であるから鋳造管のような重
量増加の問題もない。Therefore, as a welded rear arm, for example,
As shown in FIGS. 8 and 9 of Japanese Patent No. 11778, there is a pipe manufactured by cutting out a part of a square pipe and connecting the remaining part by welding. The rear arm of this publication has a bending stiffness distribution that corresponds to the load distribution mentioned above because the cross-sectional height becomes lower toward the rear end, and the wall thickness is the same as that of a normal extruded tube, so it is cast. There is no problem of weight increase like with pipes.
しかしながら上記公報記載のリヤアームは、溶接構造で
あるから、溶接ビード部の応力集中、溶接熱による材料
軟化の発生が避けられず、クランクが発生し易い等、強
度上の信頼性に劣る問題がある。また溶接ビードの分だ
け重量が増加する問題、及び比較的熟練を要する溶接作
業が必要な分だけ生産性が低い問題もある。However, since the rear arm described in the above publication has a welded structure, stress concentration at the weld bead and material softening due to welding heat are unavoidable, and there are problems with poor reliability in terms of strength, such as easy cranking. . There are also problems in that the weight increases due to the weld bead, and that productivity is low because welding work that requires relatively skill is required.
本発明は上記従来の問題点を解消するためになされたも
ので、溶接の必要がなく、従って溶接ビードによる応力
集中、材料軟化の問題がなく、その結果強度上の（ｉｔ
ＩＩ性を向上できる自動二輪車のリヤアームを提供す
ることを目的としている。The present invention has been made to solve the above-mentioned conventional problems, and there is no need for welding, so there is no problem of stress concentration or material softening due to weld beads, and as a result, the strength is improved (it
The purpose of the present invention is to provide a rear arm for a motorcycle that can improve performance.
本発明は、左、右一対のアーム本体を連結部材で接続し
てなり、前端部が車体フレームに枢支され、後端部に後
輪が軸支され、上記前端部と後端部との間に後輪懸架装
置が接続される自動二輪車のリヤアームにおいて、上記
アーム本体の、上記後輪懸架装置接続部より後側部分及
び前側部分の少なくとも一方を、筒状の素管を、横断面
角形で、かつ後端部側又は後端部側ほど断面積が小さく
なる形状に圧縮成形してなるテーパ角管で構成したこと
をｖＰ徴としている。The present invention comprises a pair of left and right arm bodies connected by a connecting member, the front end being pivotally supported by the vehicle body frame, the rear end pivotally supporting a rear wheel, and the front end and the rear end being connected together. In a rear arm of a motorcycle to which a rear wheel suspension is connected between, at least one of the rear portion and the front portion of the arm body from the rear wheel suspension connection portion is formed of a cylindrical raw tube and has a rectangular cross section. The vP feature is that the tube is formed of a tapered rectangular tube that is compressed and formed into a shape in which the cross-sectional area becomes smaller toward the rear end or toward the rear end.
ここで本発明において、アーム本体の断面積が端部側ほ
ど小さくなるとは、断面高さ又は断面幅の一方又は両方
が小さくなるとの意味であるが、断面高さを変化させる
方がより効果的である。また本発明のアーム本体には、
上記後輪懸架装置接続部より前側のみ、後側のみ、及び
この両方をテーパ角管で構成した場合が含まれる。Here, in the present invention, when the cross-sectional area of the arm body becomes smaller toward the end, it means that one or both of the cross-sectional height and cross-sectional width becomes smaller, but it is more effective to change the cross-sectional height. It is. In addition, the arm body of the present invention includes:
This includes a case where only the front side, only the rear side, or both of the front side and the rear side of the rear wheel suspension connection part are formed of tapered square tubes.
また本発明のテーパ角管は、例えば以下の方法で製造で
きる。即ち、丸バイブを回転させながら軸直角方向に打
撃部材で打撃し、かつ該打撃部材の突出量を徐々に変化
させる、いわゆるロータリースウェージ加工によって端
部側程小径のテーパ丸バイブに成形し、さらに該パイプ
内に所定形状の内型を挿入した状態で外方から外型で加
圧することによって製造できる。Further, the tapered rectangular tube of the present invention can be manufactured, for example, by the following method. That is, the round vibrator is rotated and struck with a striking member in a direction perpendicular to its axis, and the amount of protrusion of the striking member is gradually changed, which is a so-called rotary swaging process. Furthermore, it can be manufactured by inserting an inner mold of a predetermined shape into the pipe and applying pressure from the outside with an outer mold.
また、本発明のテーパ角管には、端部側程厚肉にしたも
の、及び側壁を外方膨らむように湾曲させたものも含ま
れ、上述のロータリスウエージ加工を行う上端部側ほど
厚肉にすることができ、上記内型を外方に膨らませた湾
曲形状にすることにより側壁を外方に湾曲させることが
できる。In addition, the tapered rectangular tube of the present invention includes one in which the wall is thicker toward the end, and one in which the side wall is curved so as to bulge outward. The side wall can be curved outward by forming the inner mold into an outwardly bulging curved shape.
本発明に係る自動二輪車のリヤアームによれば、アーム
本体を端部側ほど断面形状の小さいテーパ角管で構成し
たので、必要な曲げ剛性分布に応じた断面形状を有する
こととなり、強度上合理的であり、また鋳造製の場合の
ような重量増加の問題もない。According to the rear arm of a motorcycle according to the present invention, since the arm main body is constructed of a tapered rectangular tube whose cross-sectional shape becomes smaller toward the end, it has a cross-sectional shape that corresponds to the required bending rigidity distribution, and is rational in terms of strength. Moreover, there is no problem of weight increase unlike in the case of casting.
また、本発明のテーパ角管は、例えば丸パイプ等の素管
を角形のテーパ状に圧縮成形した構造のものであり、上
述の角パイプを切り欠いた後溶接する場合のような溶接
作業は不要である。従って溶接ビードによる応力集中、
材料軟化の問題が生じることはなく、強度上の信頼性を
向上できるとともに、生産性を改善できる。また強度上
の信頼性が高い分だけ薄肉化を図ることができる点及び
溶接ビードがない点から、上記公報記載のものよりさら
に軽量化できる。In addition, the tapered square pipe of the present invention has a structure in which a raw pipe such as a round pipe is compression-molded into a square tapered shape, and welding work such as the above-mentioned case where the square pipe is cut out and then welded is not required. Not necessary. Therefore, stress concentration due to the weld bead,
The problem of material softening does not occur, and reliability in terms of strength can be improved, as well as productivity. In addition, since the thickness can be made thinner due to the high reliability in terms of strength and there is no weld bead, the weight can be further reduced than that described in the above-mentioned publication.
以下、本発明の実施例を図について説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図ないし第５図は本発明の第１実施例による自動二
輪車のリヤアームを説明するための図である。1 to 5 are diagrams for explaining a rear arm of a motorcycle according to a first embodiment of the present invention.
図において、１は本実施例リヤアームが採用された自動
二輪車であり、これの車体フレーム２は、ヘッドパイプ
３に左、右一対のメインバイブ４の前端を溶接接続し、
該各メインバイブ４の後端にリヤアームブラケット５を
溶接接続するとともに、該左、右のブラケット５同士を
クロスパイプ５ａで接続し、さらにメインパイプ４の前
端部にエンジン懸架用ダウンチューブ５ｂを固定した構
造となっている。ここで上記メインバイブ４は、後述の
リヤアームと同様の製法で製造されたテーパ角管を用い
て構成されている。そしてこのメインバイブ４は、アル
ミニューム合金又は鉄製の横断面縦長の長方形状のもの
で、その断面高さはヘンドパイブ３に接続された前端部
が最大で、ここからリヤアームブラケット５に接続され
た後端部側ほど小さくなっており、またその肉厚は後端
側ほど厚くなっている。In the figure, reference numeral 1 denotes a motorcycle in which the rear arm of this embodiment is adopted, and its body frame 2 has front ends of a pair of left and right main vibes 4 connected to a head pipe 3 by welding.
A rear arm bracket 5 is welded and connected to the rear end of each main vibe 4, and the left and right brackets 5 are connected with a cross pipe 5a, and a down tube 5b for suspending the engine is fixed to the front end of the main pipe 4. It has a similar structure. Here, the main vibe 4 is constructed using a tapered rectangular tube manufactured by the same manufacturing method as the rear arm, which will be described later. The main vibe 4 is made of aluminum alloy or iron and has a vertically elongated rectangular cross section.The main vibe 4 has a maximum cross-sectional height at the front end connected to the hend pipe 3, and from there it is connected to the rear arm bracket 5. It becomes smaller toward the end, and its thickness becomes thicker toward the rear end.
上記ヘンドパイブ３には、下端で前輪６を軸支する前フ
オーク７の操向軸７ａが軸支されており、該前フオーク
７の上端には操向ハンドル８が固定されている。また上
記車体フレーム２の中央部には、ダウンチューブ５ｂ、
リヤアームブラケット５により、エンジンユニット
９が懸架支持されている。このエンジンユニット９は水
冷式２サイクル車気筒型のもので、シリンダボディの前
壁には排気管１０が接続され、後壁には気化器１１が接
続されており、該気化器１１及びこれに接続されたエア
クリーナ１２は上記左、右のメインバイブ４．４間に位
置している。なお、１３は燃料タンク、１３ａはシート
、１４はラジェータであり、燃料タンク１３はシート荷
重に耐え得る構造になっている。A steering shaft 7a of a front fork 7 which pivotally supports the front wheel 6 at its lower end is supported on the hend pipe 3, and a steering handle 8 is fixed to the upper end of the front fork 7. Further, in the center part of the vehicle body frame 2, a down tube 5b,
An engine unit 9 is suspended and supported by the rear arm bracket 5. This engine unit 9 is of a water-cooled two-stroke cylinder type, and an exhaust pipe 10 is connected to the front wall of the cylinder body, and a carburetor 11 is connected to the rear wall. The connected air cleaner 12 is located between the left and right main vibes 4.4. Note that 13 is a fuel tank, 13a is a seat, and 14 is a radiator, and the fuel tank 13 has a structure that can withstand the seat load.
また、上記リヤアームブラケット５には、後端で後輪１
５を軸支するリヤアーム１６が上下に揺動自在に枢支さ
れており、このリヤアーム１６と車体フレーム２との間
には、リンク機ｆ＊１７ａと緩衝器１７ｂとからなる後
輪懸架装置１７が配置されている。The rear arm bracket 5 also has a rear wheel 1 at its rear end.
A rear arm 16 is pivotally supported to be able to swing up and down, and between this rear arm 16 and the vehicle body frame 2 is a rear wheel suspension system 17 consisting of a link mechanism f*17a and a shock absorber 17b. is located.
そして上記リヤアーム１６は、前、後アーム１９．１８
からなる左、右一対のアーム本体２６゜２６を連結パイ
プ１９ｃで接続するとともに、該アーム本体２６の後端
に車軸を支持するエンドピース２０を溶接固定して構成
されている。なお１９ｅは補強ブラケットである
上記左、右の前アーム１９及び補強ブラケット１９ｅは
、アルミニューム合金を一体鋳造してなるものである。The rear arm 16 includes front and rear arms 19.18.
A pair of left and right arm bodies 26 and 26 are connected by a connecting pipe 19c, and an end piece 20 for supporting an axle is fixed to the rear end of the arm body 26 by welding. The left and right forearm 19 and the reinforcing bracket 19e are integrally cast from aluminum alloy.
前アーム１９は、横断面縦長の長方形状で、側面視前側
ほど断面高さが小さくなったテーパ角管となっており、
前端部にはリヤアームブラケット５に軸支されるビボン
ト部１９ａが一体形成され、後端部には接続部１９ｆが
突設されている。また上記連結バイブ１９ｃはアルミニ
ニーム合金の押し出し成形材からなる横断面長方形筒状
のもので、その車幅方向中央下面には上記後輪懸架装置
１７のリンク機構１７８を軸支するリンク支持部１９ｄ
が一体形成されている。The forearm 19 has a vertically elongated rectangular cross section, and is a tapered square tube whose cross-sectional height becomes smaller toward the front in side view.
A bibond portion 19a that is pivotally supported by the rear arm bracket 5 is integrally formed at the front end, and a connecting portion 19f is provided protruding from the rear end. The connecting vibe 19c is made of an extruded aluminum alloy and has a rectangular cylindrical cross section, and has a link support portion 19d on the lower surface at the center in the vehicle width direction that pivotally supports the link mechanism 178 of the rear wheel suspension 17.
are integrally formed.
上記左、右の後アーム１８の前端には上記前アーム１９
の接続部１９ｆが嵌合挿入され、溶接固定されている。The front ends of the left and right rear arms 18 are provided with the front arms 19.
The connecting portion 19f is fitted and inserted and fixed by welding.
この後アーム１Ｂは、アルミニューム合金又は鉄製の押
し出し成形材である丸パイプを、横断面縦長の長方形状
で、がっ後端側ほどその断面高さが低いテーバ状に圧縮
成形してなるテーパ角管から構成されている。またこの
後アーム１８の上、下壁１８ａ、１８ａは平坦になって
いるのに対し、左、右側壁１８ｂは外方に膨らむように
湾曲している。さらにまたこの後アーム１８の上、下壁
１８ａ及び左、右側壁１８ｂの肉厚は、前端のｔｌから
後端のｔ２まで徐々に厚くなっており、かつ後端部１８
ｃは平面視斜めにカットされている。これにより上記エ
ンドピース２゜との溶接部分の肉厚の急激な変化を緩和
するとともに溶接代を長くしている。なお、１９ｇは板
金型の補強ブラケットである。The rear arm 1B is a taper formed by compression molding a round pipe, which is an extruded material made of aluminum alloy or iron, into a tapered shape with a vertically elongated cross section and a tapered shape with a lower cross-sectional height toward the rear end. It is made up of square tubes. Further, while the upper and lower walls 18a and 18a of the rear arm 18 are flat, the left and right walls 18b are curved so as to bulge outward. Furthermore, the thickness of the upper and lower walls 18a and left and right side walls 18b of the rear arm 18 gradually increases from tl at the front end to t2 at the rear end, and
c is cut diagonally in plan view. This alleviates the sudden change in wall thickness of the welded portion with the end piece 2° and lengthens the welding allowance. Note that 19g is a sheet metal type reinforcing bracket.
次に上記アーム本体２６の後アーム１８の製造方法につ
いて第５図を参照しながら説明する。Next, a method of manufacturing the rear arm 18 of the arm body 26 will be explained with reference to FIG.
■ 軸方向に同一直径の通常の押し出し成形品（アルミ
ニューム合金又は鉄製）である丸パイプ２８ａを準備し
て所定長さに切断し、これを軸方向外方ほど小径のテー
パ丸管２８ｂにロータリスウェージ加工法で成形する（
第５図（ａｌ）、なお、このロータリスウェージ法は、
上記丸パイプ２８ａに、これを軸方向に移動させながら
打撃爪２９Ｃによって軸直角方向に打撃力を与え、かつ
上記打撃爪２９ｃの突出量を徐々に大きくする方法であ
る。この方法によれば、その直径が小さくなるほど厚肉
となり、従って上記テーバ丸管２８は、中央部の、ｔ
１から端部のｔ２に端部側ほど厚肉となっている。■ Prepare a round pipe 28a which is a regular extruded product (made of aluminum alloy or iron) with the same diameter in the axial direction, cut it to a predetermined length, and rotary rotary pipe 28a into a tapered round pipe 28b whose diameter is smaller toward the outside in the axial direction. Form by swaging method (
FIG. 5 (al), this rotary swage method is
This is a method in which a striking force is applied to the round pipe 28a in the direction perpendicular to the axis by the striking claw 29C while moving it in the axial direction, and the amount of protrusion of the striking claw 29c is gradually increased. According to this method, the smaller the diameter, the thicker the wall, and therefore the Taber round tube 28 has a t
From 1 to t2 at the end, the wall becomes thicker toward the end.
なお、上記テーパ丸管の作成に当たっては、軸方向に沿
って直径を所望大きさに変化させてなる内型を上記丸パ
イプ内に挿入し、この状態で回転させ、これにローラを
押し付けながら軸方向に移動させるスピニング加工、い
わゆるへら絞り加工を採用してもよい、この方法によれ
ば、肉厚を軸方向に沿って任意に変化させることができ
る。When creating the tapered round pipe, an inner mold whose diameter is changed to the desired size along the axial direction is inserted into the round pipe, rotated in this state, and the shaft is pressed while pressing a roller against it. A spinning process in which the material is moved in the axial direction, a so-called spatula drawing process, may be employed. According to this method, the wall thickness can be arbitrarily changed along the axial direction.
■ 上記テーパ丸管２８ｂを中央部（直径の最大部分）
から切断し同図（ｂｌ）、このテーパ丸管２８Ｃに恒熱
炉で例えば４６０℃に１．５時間保持する焼鈍処理を施
して、上記打撃による残留歪を除去する。■ The center part (maximum diameter part) of the tapered round tube 28b
The tapered round tube 28C is cut from the tube and subjected to an annealing treatment held at 460° C. for 1.5 hours in a constant heat furnace to remove the residual strain caused by the impact.
■ そして上記テーパ丸管２８Ｃを所望の横断面角形に
圧縮成形するのであるが、まず例えば側壁のみが平坦化
された予備角形状を有する内型２９ａを上記テーバ丸管
２８ｃ内に挿入し、外方から外型２９ｄで加圧する予備
角出し成形を行って予備テーパ角管２８ｄを作成する０
次いで最終角形状を有する内型２９ｂを挿入して外方か
ら外型２９４１で加圧する最終角出し成形を行って最終
テーバ角管２８ｅを作成する。なお、上記内型２９ａ、
２９ｂは、テーパ角管の側壁が外方に膨らむ湾曲形状に
なるように、該型自体も外方に湾曲した形状にするのが
望ましい、この場合型抜が不能にならないように、該内
型２９ａ、２９ｂの湾曲形状の曲率半径は、テーパ角管
の全長に渡うて同−又は小径側ほど大きくする必要があ
る。(2) Then, the tapered round tube 28C is compression-molded into a desired rectangular cross section. First, for example, an inner mold 29a having a preliminary square shape in which only the side walls are flattened is inserted into the tapered round tube 28c, and the outer mold is A preliminary tapered square tube 28d is created by performing preliminary squaring molding by applying pressure from the outside mold 29d.
Next, an inner mold 29b having a final square shape is inserted, and final cornering molding is performed by applying pressure from the outside with an outer mold 2941 to produce a final Taber square tube 28e. Note that the inner mold 29a,
29b, it is desirable that the mold itself is curved outward so that the side wall of the tapered rectangular tube has a curved shape that bulges outward. In this case, the inner mold is The radius of curvature of the curved shapes of 29a and 29b needs to be the same over the entire length of the tapered rectangular tube, or it needs to be larger on the smaller diameter side.
■ 最後に上記テーパ角管を所定長さ、形状に切断すれ
ば、これにより上記後アーム１８が得られる。(2) Finally, by cutting the tapered square tube into a predetermined length and shape, the rear arm 18 is obtained.
次に本実施例の作用効果について説明する。Next, the effects of this embodiment will be explained.
本実施例ではリヤアーム１６を横断面縦長の角形で、か
つリンク支持部１９ｄを中心としてその前、後方ほど断
面高さの低いテーパ角管としたので、荷重分布（曲げモ
ーメント分布）に応じた曲げ剛性分布を有することとな
り、合理的な断面形状とすることができる。そして後ア
ーム１８については、丸パイプを圧縮成形してなるテー
パ角管で構成したので、従来の鋳造製のものに比較して
肉厚が薄くて済み、それだけ重量を軽減できる。In this embodiment, the rear arm 16 has a vertically elongated rectangular cross section, and is made of a tapered rectangular tube with a lower cross-sectional height toward the front and rear of the link support portion 19d, so that it can be bent according to the load distribution (bending moment distribution). It has a stiffness distribution and can have a rational cross-sectional shape. Since the rear arm 18 is made of a tapered square tube made by compression molding a round pipe, the wall thickness is thinner than that of a conventional casting, and the weight can be reduced accordingly.
また、上述のように、本実施例の後アーム１８は丸パイ
プの圧縮成形品であるから、角パイプの一部を切欠除去
して溶接した従来例のような溶接ビードによる応力集中
、材料軟化の問題が生じることはな（、強度上の信頼性
を向上できる。また信頼性が高い分だけ肉厚をさらに薄
くすることもできる点及び溶接ビードがない点から軽量
化できる。さらに溶接作業を不要にした分だけ生産性を
向上できる。In addition, as mentioned above, since the rear arm 18 of this embodiment is a compression molded round pipe, stress concentration and material softening due to the weld bead as in the conventional example in which a part of a square pipe is notched and welded is avoided. There are no problems (and the reliability in terms of strength can be improved.Also, the wall thickness can be made thinner due to the high reliability, and the weight can be reduced as there is no weld bead.In addition, the welding work can be reduced. Productivity can be improved by eliminating unnecessary items.
また、本実施例の後アーム１８は、肉厚が前端から後端
にかけて徐々に増加しているので、エンドピース２０と
の溶接部の肉厚変化が緩和され、溶接の信頼性を向上で
きる。またこの後端部の肉厚が厚いことから該部分の溶
接代の短いことによる強度低下を補うことができる。Further, since the rear arm 18 of this embodiment has a wall thickness that gradually increases from the front end to the rear end, the change in the wall thickness of the welded portion with the end piece 20 is alleviated, and welding reliability can be improved. Furthermore, since the wall thickness of this rear end portion is thick, it is possible to compensate for the decrease in strength due to the short welding allowance in this portion.
さらにまた、本実施例では、後アーム１日の断面形状を
、側壁１８ｂが外方に膨らんだ湾曲形状としたので、剛
性が向上するとともに、騒音の発生を軽減でき、さらに
側壁にパフ加工を施す場合に有利である。ちなみに本発
明者等の実験研究によれば、上記後アーム１８を側壁が
内方に凹んだ形状にすると、表面に短線状の傷が発生し
たり、肉厚が偏在したり、さらには上記凹み形状の管理
が困難で、デザイン上の自由度が低くなることが判明し
ている。Furthermore, in this embodiment, the cross-sectional shape of the rear arm is curved so that the side wall 18b bulges outward, which improves rigidity and reduces noise generation.Furthermore, the side wall is puffed. This is advantageous when applying Incidentally, according to experimental research by the present inventors, if the rear arm 18 is shaped so that the side wall is concave inward, short linear scratches may occur on the surface, the wall thickness may be unevenly distributed, and the above-mentioned dents may occur. It has been found that shape management is difficult and the degree of freedom in design is reduced.
また本発明のテーパ角管は、他の部品にも応用すること
ができ、例えば上記実施例で説明したように、メインパ
イプ４に応用してもよい、ちなみにこのメインバイブ４
は、従来、板金加工された横断面コ字状の左、右一対の
プレートを最中状に突き合わせて溶接していたが、本発
明のテーパ角管を採用すれば、溶接が不要になり、上記
実施例の場合と同様の効果が得られる。Further, the tapered rectangular tube of the present invention can be applied to other parts, for example, as explained in the above embodiment, it may be applied to the main pipe 4. Incidentally, this main vibe 4
Conventionally, a pair of left and right plates with a U-shaped cross section were made from sheet metal and were welded together, but by adopting the tapered rectangular tube of the present invention, welding is no longer necessary. The same effects as in the above embodiment can be obtained.
特に、上記メインバイブ４は断面高さが相当大きいこと
から、そのままでは側壁が微少振動し、騒音が発生する
懸念があるが、上述の実施例のように側壁を外方に膨ら
ませることによってこれを回避できる。また、上記メイ
ンバイブ４の後端部は断面高さが小さいことから溶接代
が短くなるが、該部分は肉厚が厚くなるのでリヤアーム
ブラケット５との溶接の信頼性が損なわれることはない
。In particular, since the main vibrator 4 has a considerably large cross-sectional height, there is a concern that the side wall may vibrate slightly and generate noise if left as is. However, by expanding the side wall outward as in the above embodiment, this can be avoided. can be avoided. Further, since the rear end portion of the main vibrator 4 has a small cross-sectional height, the welding margin is short, but since this portion has a thick wall thickness, the reliability of welding with the rear arm bracket 5 is not impaired.
一方、前端部については薄肉となるが、溶接代が長いの
で、この部分でも溶接の信頼性を確保できる。On the other hand, although the front end portion is thin, the welding allowance is long, so welding reliability can be ensured even in this portion.
第６図ないし第８図は本発明の他の実施例を説明するた
めの図であり、第１図ないし第３図と同一符号は同−又
は相当部分を示す。6 to 8 are diagrams for explaining other embodiments of the present invention, and the same reference numerals as in FIGS. 1 to 3 indicate the same or corresponding parts.
本実施例は、リヤアーム２１の左、右のアーム本体２２
の後アーム２２ａについては上述のテーパ角管をそのま
ま用いて構成し、前アーム２２ｂについては該テーパ角
管をさらに加工した例である。即ち、第８図にその製造
過程を示すように、上述の方法で作成したテーパ角管２
２を準備し、これの前アーム２２ｂ相当部分に切欠２２
ｃ′を形成し、この切欠２２Ｃ′が閉塞するようにを圧
縮し、当接線に沿って溶接したものである。そして左、
右のアーム本体２２同士は、アルミニューム押し出し成
形品からなる連結パイプ２４で連結固定されており、該
パイプ２４の下面にはリンク支持部２４ａが一体形成さ
れている。また左、右のアーム本体２２の前端にはピボ
ット部２３が溶接固定されている。なお、２３ａ、２４
ｂは補強ブラケットである。In this embodiment, the left and right arm bodies 22 of the rear arm 21 are
The rear arm 22a is constructed using the above-mentioned tapered rectangular tube as is, and the front arm 22b is an example in which the tapered rectangular tube is further processed. That is, as the manufacturing process is shown in FIG. 8, the tapered square tube 2 manufactured by the above method
2, and make a notch 22 in the part corresponding to the front arm 22b.
c' is formed, compressed so that this notch 22C' is closed, and welded along the line of contact. And the left,
The right arm bodies 22 are connected and fixed to each other by a connecting pipe 24 made of extruded aluminum, and a link support portion 24a is integrally formed on the lower surface of the pipe 24. Further, pivot portions 23 are welded and fixed to the front ends of the left and right arm bodies 22. In addition, 23a, 24
b is a reinforcing bracket.
本実施例のアーム本体２２は前アーム２２ｂについても
、テーパ角管を利用して構成したので、上記第１実施例
に比較して鋳物部分が少なくなり、さらに軽量化できる
。Since the arm main body 22 of this embodiment also uses a tapered square tube for the front arm 22b, there are fewer cast parts compared to the first embodiment, and the weight can be further reduced.
なお、上記各実施例では、リヤアーム１６，２１の後ア
ーム１８，２２８のみに押し出し材の圧縮成形品をその
まま使用したが、本発明では上記実施例とは逆に前アー
ム１９のみに上記圧縮成形品を使用しても、あるいは両
方に使用しても良い。In each of the above embodiments, the compression molded extruded material was used only for the rear arms 18 and 228 of the rear arms 16 and 21, but in the present invention, contrary to the above embodiments, the compression molded product was used only for the front arm 19. It may be used for both products or both.
以上のように、本発明に係る自動二輪車のリヤアームに
よれば、アーム本体の、後輪懸架装置接続部より後側部
分又は前側部分の少なくとも一方を、筒状の素管を、角
形でかつ端部側ほど小断面に圧縮成形してなるテーパ角
管で構成したので、荷重分布に対応した曲げ剛性を有す
る合理的な形状にできるとともに、溶接作業を不要にし
て溶接ビードによる応力集中、材料軟化を回避でき、強
度上の信鎖性を向上できるとともに、生産性を向上でき
る効果がある。As described above, according to the rear arm of a motorcycle according to the present invention, at least one of the rear part or the front part of the arm body from the rear wheel suspension connection part is made of a cylindrical raw tube, and the ends thereof are square. It is constructed from a tapered rectangular tube that is compressed and formed into a smaller cross-section toward the lower part, so it can be made into a rational shape with bending rigidity that corresponds to the load distribution, and eliminates the need for welding, which reduces stress concentration and material softening due to weld beads. This has the effect of not only improving reliability in terms of strength but also improving productivity.
第１図ないし第５図は本発明の第１実施例によるリヤア
ームを説明するための図であり、第１図はその平面図、
第２図はその側面図、第３図は第２図の■−■線断面図
、第４図は該実施例リヤアームが採用された自動二輪車
の左側面図、第５図１ａｌないし第５図（ｄｌはその製
造過程を示す工程図、第６図ないし第８図は本発明の第
２実施例を説明するための図であり、第６図はその平面
図、第７図は側面図、第８図はその製造過程を示す側面
図である。
図において、ｌは自動二輪車、２は車体フレーム、１５
は後輪、１６．２１はリヤアーム、１７は後輪懸架装置
、１８．２２ａは後アーム（アーム本体の後側部分）、
１８ｂは側壁、１９．２２ｂは前アーム（アーム本体の
前側部分）、１９ａ。
２３はピボット部（前端部）、１９Ｃ，２４は連結パイ
プ（連結部材）、１９ｄ、２４ａはリンク支持部（後輪
懸架装置接続部）、２０はエンドピース（後端部）％２
８６はテーパ角管、２２．２６はアーム本体、
２８ａは丸パイプ
（筒状の素
管）
Ｂ、ｔ２
はテーパ角管の肉厚である。1 to 5 are diagrams for explaining a rear arm according to a first embodiment of the present invention, and FIG. 1 is a plan view thereof;
Fig. 2 is a side view thereof, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, Fig. 4 is a left side view of a motorcycle in which the rear arm of this embodiment is adopted, and Figs. (dl is a process diagram showing the manufacturing process, FIGS. 6 to 8 are diagrams for explaining the second embodiment of the present invention, FIG. 6 is a plan view thereof, FIG. 7 is a side view, Fig. 8 is a side view showing the manufacturing process. In the figure, l is a motorcycle, 2 is a body frame, 15
is the rear wheel, 16.21 is the rear arm, 17 is the rear wheel suspension, 18.22a is the rear arm (the rear part of the arm body),
18b is a side wall, 19.22b is a forearm (front part of the arm body), and 19a. 23 is a pivot part (front end part), 19C and 24 are connection pipes (connection members), 19d and 24a are link support parts (rear wheel suspension connection part), and 20 is an end piece (rear end part)%2
86 is a tapered square tube, 22.26 is an arm body, 28a is a round pipe (cylindrical tube), B, and t2 are the wall thicknesses of the tapered square tube.
Claims (3)
り、前端部が車体フレームに枢支され、後端部に後輪が
軸支され、上記前端部、後端部間部分に後輪懸架装置が
接続される自動二輪車のリヤアームにおいて、筒状の素
管を、横断面角形で、かつ端部側ほど断面積が小さくな
る形状に圧縮成形してなるテーパ角管により上記アーム
本体の上記後輪懸架装置接続部より後側部分及び前側部
分の少なくとも一方を構成したことを特徴とする自動二
輪車のリヤアーム。(1) A pair of left and right arm bodies are connected by a connecting member, the front end is pivotally supported by the vehicle body frame, the rear end is pivotally supported by the rear wheel, and the part between the front end and the rear end is In the rear arm of a motorcycle to which a rear wheel suspension system is connected, the arm body is made of a tapered rectangular tube formed by compression molding a cylindrical raw tube into a shape with a rectangular cross section and a cross-sectional area that becomes smaller toward the end. A rear arm for a motorcycle, comprising at least one of a rear portion and a front portion of the rear wheel suspension connection portion.
ど厚くなっていることを特徴とする特許請求の範囲第１
項記載の自動二輪車のリヤアーム。(2) Claim 1, characterized in that the wall thickness of the tapered rectangular tube becomes thicker toward the rear end or the front end.
The rear arm of the motorcycle described in Section 1.
なっていることを特徴とする特許請求の範囲第１項又は
第２項記載の自動二輪車のリヤアーム。(3) The rear arm of a motorcycle according to claim 1 or 2, wherein the side wall of the tapered square tube has a curved shape that swells outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1109599A JP2937343B2 (en) | 1989-04-27 | 1989-04-27 | Motorcycle rear arm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1109599A JP2937343B2 (en) | 1989-04-27 | 1989-04-27 | Motorcycle rear arm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02286488A true JPH02286488A (en) | 1990-11-26 |
| JP2937343B2 JP2937343B2 (en) | 1999-08-23 |
Family
ID=14514363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1109599A Expired - Fee Related JP2937343B2 (en) | 1989-04-27 | 1989-04-27 | Motorcycle rear arm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2937343B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6182994B1 (en) | 1995-09-25 | 2001-02-06 | Honda Giken Kogyo Kabushiki Kaisha | Rear swing arm of motor-bike with tapered rectangular pipe member and method of manufacturing tapered rectangular pipe for vehicle body |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS519061A (en) * | 1974-07-15 | 1976-01-24 | Jitensha Sangyo Shinko Kyokai | PAIPUTANMATSUSE IKEIKI |
| JPS6095390A (en) * | 1983-10-31 | 1985-05-28 | 株式会社東芝 | Heat exchange device for removing core collapse heat |
| JPS61102359A (en) * | 1984-10-25 | 1986-05-21 | Nippon Denso Co Ltd | Automatic brake system for vehicles |
-
1989
- 1989-04-27 JP JP1109599A patent/JP2937343B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS519061A (en) * | 1974-07-15 | 1976-01-24 | Jitensha Sangyo Shinko Kyokai | PAIPUTANMATSUSE IKEIKI |
| JPS6095390A (en) * | 1983-10-31 | 1985-05-28 | 株式会社東芝 | Heat exchange device for removing core collapse heat |
| JPS61102359A (en) * | 1984-10-25 | 1986-05-21 | Nippon Denso Co Ltd | Automatic brake system for vehicles |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6182994B1 (en) | 1995-09-25 | 2001-02-06 | Honda Giken Kogyo Kabushiki Kaisha | Rear swing arm of motor-bike with tapered rectangular pipe member and method of manufacturing tapered rectangular pipe for vehicle body |
| US6219919B1 (en) | 1995-09-25 | 2001-04-24 | Honda Giken Kogyo Kabushiki Kaisha | Rear swing arm of motor-bike with tapered rectangular pipe member and method of manufacturing tapered rectangular pipe for vehicle body |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2937343B2 (en) | 1999-08-23 |
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