JPH04189692A - Rear fork for motorcycle - Google Patents

Abstract

PURPOSE:To obviate need of achieving an excessive strength, and set a weight light by forming right and left fork arm parts by press moulding a light alloy plate or steel plate to have a rectangular cross section, and putting and welding end edges on each other on the inner side to make a pipe-like form having a thick front part and a thin and tapered back part. CONSTITUTION:Right and left fork arms 1 are press moulded of a light alloy plate or steel plate to have a rectangular cross section. In this case, they are moulded to be thick at the front side and thin at the back side corresponding to the size of a load they receive. End edges on both sides bent to have the rectangular cross section are formed to be on the inner side, and they are put and welded on each other. The forward end of the right and left fork arm 1 is engaged and welded with a rear end side of a front metal 4 having a pivot hole 2 and a cushion unit connection part 3 for installation to a vehicle body. In the mean-while, an axle metal 5 is engaged and welded with the back end of the right and left fork arm 1. In addition, a brake caliper connection member 6 is welded at a back part on the inner side of one fork arm 1.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、自動二輪車の後ホークに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a rear fork for a motorcycle.

〔従来の技術〕[Conventional technology]

自動二輪車は、後ホークの前端をフレームの後下部に揺
動可能に軸着し、後ホークとフレームの上部の間にクツ
ションユニットを連結し、クツションユニットを伸縮さ
せて後ホークが揺動クツションできるようにし、後ホー
クの後端に後輪を回転自在に支承した車軸を取付けるよ
うにしている。In a motorcycle, the front end of the rear fork is pivotally attached to the rear lower part of the frame, a cushion unit is connected between the rear fork and the upper part of the frame, and the cushion unit is expanded and contracted to allow the rear fork to swing. The axle that rotatably supports the rear wheel is attached to the rear end of the rear fork.

そして、後ホークは、軽合金管又は鋼管を適宜長さに切
断溶着して製作したり、軽合金を用いて一体鋳造して製
作したり、鍛造して製作している。The rear fork is manufactured by cutting and welding a light alloy pipe or steel pipe to an appropriate length, or by integrally casting a light alloy, or by forging.

又、鋳造又は鍛造した前部金具にパイプ材の左右のホー
クアームを溶着するようにしたものもある。There is also one in which the left and right hawk arms of pipe material are welded to a front metal fitting that is cast or forged.

例えば、特開平２−３４４９４号公報参照。For example, see Japanese Patent Application Laid-Open No. 2-34494.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

パイプ材を用いた後ホークは、断面が均一で、最も荷重
のかかる部分に耐えるように太さや肉厚さを設定するの
で、過大な強度になる部分があって重量が重くなる。又
、テーパー状にするデザインができない。軽合金などで
一体鋳造するものは、材料が粗で脆いので、肉厚さを増
して強度を得る必要があり、重くなる。又、鍛造するも
のは、中空構造にできないので、細くできても重くなる
。A rear hawk made of pipe material has a uniform cross-section, and the thickness and thickness are set to withstand the highest load, so there are parts that are too strong and therefore heavy. Also, it is not possible to create a tapered design. Items made of light alloy or other materials cast in one piece are coarse and brittle, so it is necessary to increase the wall thickness to obtain strength, which results in weight. Also, forged items cannot be made into hollow structures, so even if they can be made thin, they will be heavy.

この発明は、かかる点に鑑み、左右のホークアーム部分
を、軽合金板又は鋼板を断面長四角にプレス成形して端
縁を内側で重ねて溶着してバイブ状にし、断面の大きさ
も順次変えることができて軽量で体裁がよい自動二輪車
の後ホークを得ることを目的とする。In view of this, the present invention has made the left and right hawk arm parts by press-forming light alloy plates or steel plates into long square cross-sections, stacking the edges on the inside and welding them to form a vibrator, and changing the cross-sectional size sequentially. The objective is to obtain a lightweight and good-looking motorcycle rear hawk.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために、この発明の自動二輪車の後
ホークは、軽合金板又は鋼板を前部を太く後部を細く断
面長四角形にプレス成形し、両側の端縁を内側で重ねて
溶着した左右のホークアームを設け、該左右のホークア
ームを前部金具の後端両側に溶着し、左右のホークアー
ムの後端に車軸金具を溶着するようにしたことにある。In order to achieve the above object, the rear fork of the motorcycle of the present invention is made by press-forming a light alloy plate or steel plate into a rectangular cross section with a thicker front part and a thinner rear part, and overlaps the edges on both sides inside and welds them. Left and right hawk arms are provided, the left and right hawk arms are welded to both rear ends of a front metal fitting, and an axle metal fitting is welded to the rear ends of the left and right hawk arms.

そして、左右のホークアームの端縁を内側で重ね、片方
を内側に凹めて他方に重ねて溶着するようにしたことに
ある。The end edges of the left and right hawk arms are overlapped on the inside, one is recessed inward, and the other is overlapped and welded.

又、片側のホークアームの後部内側に車体中心線と平行
な平行面を設け、該平行面にブレーキキャリパ一連結片
を溶着するようにしたことにある。Further, a parallel surface parallel to the center line of the vehicle body is provided on the inside of the rear part of one of the hawk arms, and the brake caliper chain piece is welded to the parallel surface.

（作用） 左右のホークアームは、軽合金板又は鋼板を用いて、断
面長四角形にプレス成形するので、断面を前側を太く後
側を細くテーパー状に形成することができ、中空構造で
受ける荷重の大きさに合せた断面にできて軽量にできる
。そして、プレス成形で折曲げた端縁を内側に向けて溶
着するので、溶着部分が目立つことがなく、外観を良好
にてきる。又、重ね合せる端縁の片側を、内側に凹めて
重ねることによって、内側も突出縁のない平面にできる
。片側のホークアームの内側に、ブレーキキャリパーを
摺動させて連結するブレーキキャリパ一連結片を設ける
場合は、片側のホークアームの後部内側に、車体中心線
と平行な平行面を設け、この平行面にブレーキキャリパ
一連結片を溶着することによって、ブレーキキャリパ−
を後側から摺動させて嵌合せられる。(Function) The left and right hawk arms are press-formed to have a rectangular cross section using light alloy plates or steel plates, so the cross section can be tapered to be thicker at the front and thinner at the rear, which reduces the load received by the hollow structure. It can be made into a cross section that matches the size of the machine, making it lightweight. Since the edges bent by press molding are welded inward, the welded portion is not noticeable and the appearance is improved. Furthermore, by recessing one side of the overlapping edges inward and overlapping them, the inside can also be made flat without any protruding edges. When installing a brake caliper chain piece on the inside of one hawk arm to which the brake caliper slides and connects, a parallel surface parallel to the vehicle body center line is provided on the inside rear of one hawk arm, and this parallel surface By welding a series of brake caliper pieces to the brake caliper
It can be fitted by sliding it from the rear side.

〔実施例〕〔Example〕

以下、本発明の実施例を図面によって説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第１図乃至第８図は本発明の一実施例を示すものである
。1 to 8 show one embodiment of the present invention.

左右のホークアーム１は、軽合金板又は鋼板を用いて、
断面長四角形にプレス成形する。その場合、平面及び側
面から見て、前側を太く後側を細く、受ける荷重の大き
さに合せて成形できる。断面長四角形に曲げた両側の端
縁は、内側になるように形成し、重ね合せて溶着する。The left and right hawk arms 1 are made of light alloy plate or steel plate,
Press-form into a long rectangular cross section. In that case, when viewed from the plane and side, the front side can be made thicker and the rear side thinner, so that the shape can be shaped to match the size of the load to be received. The edges on both sides of the bent rectangular cross section are formed so as to be inward, and are overlapped and welded.

その場合、片側を第５図に示すように中空部分の内側に
板厚さ分だけ凹めることによって、内側に突出縁を出さ
ないようにできる。左右のホークアーム１の前端は、車
体への取付けのピボット孔２や、クツションユニット連
結部３を設けた前部金具４の後端両側に嵌合せて溶着す
る。又、左右のホークアーム１の後端には、後輪の車軸
を通して締若する車軸金具５を嵌合せて溶着する。片側
のホークアーム１の内側後部に、ブレーキキャリパー連
結片６を溶着する場合は、片側のホークアーム１の内側
後部に、車体中心線と平行な平行面７を形成しておいて
、この平行面７にブレーキキャリパ一連結片６を溶むす
ることによって、ブレーキキャリパーを後側から摺動さ
せて嵌込むことができる。In that case, as shown in FIG. 5, by recessing one side of the hollow portion by the thickness of the plate, the protruding edge can be prevented from protruding inward. The front ends of the left and right hawk arms 1 are fitted and welded to both rear ends of a front metal fitting 4 provided with a pivot hole 2 for attachment to the vehicle body and a cushion unit connection part 3. Further, an axle fitting 5, which is tightened through the axle of the rear wheel, is fitted and welded to the rear ends of the left and right hawk arms 1. When welding the brake caliper connecting piece 6 to the inner rear part of the hawk arm 1 on one side, a parallel surface 7 parallel to the vehicle body center line is formed on the inner rear part of the hawk arm 1 on one side, and this parallel surface By melting the brake caliper connection piece 6 at 7, the brake caliper can be slid and fitted from the rear side.

第９図乃至第１１図は本発明の他の実施例を示すもので
ある。9 to 11 show other embodiments of the present invention.

この場合には、左右のホークアーム１の内側で重ねて溶
着する端縁の片側を第１１図に示すように、他側の外側
に曲げ出して重ねて溶着するようにしである。その他は
第１図乃至第８図に示したものと同じで、ブレーキキャ
リパー連結片６を設けていない。In this case, as shown in FIG. 11, one side of the edges to be overlapped and welded on the inside of the left and right hawk arms 1 is bent out to the outside of the other side and overlapped and welded. The other parts are the same as those shown in FIGS. 1 to 8, and the brake caliper connecting piece 6 is not provided.

〔発明の効果〕〔Effect of the invention〕

左右のホークアームは、板体をプレス成形して断面長四
角形に成形するので、前部を太く後部を細くテーパー状
にできて、受ける荷重に合せた断面にでき、過強度にす
る必要がなく、中空にできて軽量化ができる。そして左
右のホークアームの重ね合せた端縁は、内側に向けるこ
とができるので、外観に溶着部が現れず、きれいに仕上
る。又、濱着ビード部が突出しないようにもでき、ブレ
ーキキャリパー連結片の取付は精度も、ホークアームの
内側後部に平行面を設けることによって、高く保つこと
ができる。The left and right hawk arms are press-formed from plates to have a long rectangular cross section, so the front part is thick and the rear part is tapered to make it thinner, making the cross section suitable for the load they receive, eliminating the need for overstrength. , can be made hollow and lightweight. The overlapped edges of the left and right hawk arms can be turned inward, so no welds appear on the outside, resulting in a clean finish. Furthermore, the landing bead can be prevented from protruding, and the mounting accuracy of the brake caliper connecting piece can be maintained at a high level by providing a parallel surface on the inner rear part of the hawk arm.

【図面の簡単な説明】[Brief explanation of drawings]

第１図乃至第８図は本発明の一実施例を示し、第１図は
平面図、 第２図は側面図、 第３図は第１図Ａ矢示部の拡大平面図、第４図は同内側
面図、 第５図は第４図Ｂ−Ｂ矢視断面図、 第６図は片側のホークアーム単体の内側面図第７図は同
平面図、 第８図は側面図、 第９図乃至第１１図は本発明の他の実施例を示し、 第９図は平面図、 第１０図は側面図、 第１１図は第９図Ｃ−Ｃ矢視断面図、 である。 １・・・ホークアーム、４・・・前部金具、５・・・車
軸金具、６・・・ブレーキキャリパー連結片、７・・・
平行面。1 to 8 show one embodiment of the present invention, FIG. 1 is a plan view, FIG. 2 is a side view, FIG. 3 is an enlarged plan view of the part indicated by arrow A in FIG. 1, and FIG. is an inner side view of the same, Fig. 5 is a sectional view taken along the line B-B in Fig. 4, Fig. 6 is an inner side view of one hawk arm alone, Fig. 7 is a plan view of the same, Fig. 8 is a side view, 9 to 11 show other embodiments of the present invention, in which FIG. 9 is a plan view, FIG. 10 is a side view, and FIG. 11 is a sectional view taken along the line CC in FIG. 9. 1... Hawk arm, 4... Front metal fitting, 5... Axle metal fitting, 6... Brake caliper connection piece, 7...
parallel plane.

Claims (1)

【特許請求の範囲】 １、軽合金板又は鋼板を前部を太く後部を細く断面長四
角形にプレス成形し、両側の端縁を内側で重ねて溶着し
た左右のホークアームを設け、該左右のホークアームを
前部金具の後端両側に溶着し、左右のホークアームの後
端に車軸金具を溶着するようにしたことを特徴とする自
動二輪車の後ホーク。 ２、左右のホークアームの端縁を内側で重ね、片方を内
側に凹めて他方に重ねて溶着するようにしたことを特徴
とする請求項１記載の自動二輪車の後ホーク。 ３、片側のホークアームの後部内側に車体中心線と平行
な平行面を設け、該平行面にブレーキキャリパー連結片
を溶着するようにしたことを特徴とする請求項１記載の
自動二輪車の後ホーク。[Claims] 1. A light alloy plate or a steel plate is press-formed into a long rectangular cross section with a thick front part and a thin rear part, and left and right hawk arms are provided with the edges on both sides overlapped and welded on the inside, and the left and right hawk arms are A rear hawk of a motorcycle, characterized in that hawk arms are welded to both rear ends of a front metal fitting, and axle metal fittings are welded to the rear ends of the left and right hawk arms. 2. The rear fork for a motorcycle according to claim 1, wherein the end edges of the left and right fork arms are overlapped on the inside, one is recessed inward, and the other is overlapped and welded. 3. The rear fork of a motorcycle according to claim 1, characterized in that a parallel surface parallel to the center line of the vehicle body is provided on the inner rear side of one of the fork arms, and a brake caliper connecting piece is welded to the parallel surface. .