JP2000202721A - Manufacture of universal joint fork - Google Patents
Manufacture of universal joint forkInfo
- Publication number
- JP2000202721A JP2000202721A JP11099430A JP9943099A JP2000202721A JP 2000202721 A JP2000202721 A JP 2000202721A JP 11099430 A JP11099430 A JP 11099430A JP 9943099 A JP9943099 A JP 9943099A JP 2000202721 A JP2000202721 A JP 2000202721A
- Authority
- JP
- Japan
- Prior art keywords
- tab
- fork
- flat plate
- lugs
- universal joint
- 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
Landscapes
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術の分野】本発明は、フォークを備え
た円筒状のハブと軸線に垂直な腕部をもつ十字軸とを接
続する自在継手用フォークの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a universal joint fork for connecting a cylindrical hub having a fork and a cross shaft having an arm perpendicular to the axis.
【０００２】[0002]
【従来の技術】この種の自在継手は通常、十字形腕部を
もつ十字軸と伝動軸等の回転軸との角度連結に用いら
れ、円筒状ハブの先端に形成した一対のフォークに十字
軸の腕部をニードル入りカップを介して挿入される。フ
ォークをもつ円筒状ハブを平坦な金属板から塑性加工に
よって製造することは従来から知られている。例えば図
７〜図８（ａ），（ｂ）に示すように、金属板の素材１
を円筒状のハブを形成すべき矩形板２と、該矩形板の両
端に連続しかつ該矩形板を円筒形に曲げて円筒形ハブ５
（図８）を形成したときにボルト締め用の突出部６とな
る耳片３と、フォーク８を形成するための一対のタブ４
とを備えたブランクとして打ち抜き、矩形板２を円筒状
に曲げかつ耳部３を図８（ｂ）のように中途部から内側
へ折り返して緊締ボルトの挿通孔１４およびねじ孔１６
を穿け、またフォーク８には十字形腕部１９を挿し込む
ための貫通孔１３を形成し、さらにハブ内周面にスプラ
イン溝１７の加工を行って図８（ａ）のような自在継手
用フォークを得ている。2. Description of the Related Art A universal joint of this type is generally used for angular connection between a cross shaft having a cross arm and a rotating shaft such as a transmission shaft, and a cross shaft is attached to a pair of forks formed at the tip of a cylindrical hub. Is inserted through a needle-containing cup. It is conventionally known to produce a cylindrical hub with a fork from a flat metal plate by plastic working. For example, as shown in FIGS. 7 to 8A and FIG.
A rectangular hub 2 to form a cylindrical hub, and a cylindrical hub 5 connected to both ends of the rectangular plate and bending the rectangular plate into a cylindrical shape.
The lug 3 which becomes the protrusion 6 for bolting when forming (FIG. 8), and a pair of tabs 4 for forming the fork 8
8B, the rectangular plate 2 is bent into a cylindrical shape, and the lugs 3 are folded inward from the middle as shown in FIG.
Also, a through hole 13 is formed in the fork 8 for inserting the cruciform arm 19, and a spline groove 17 is formed in the inner peripheral surface of the hub to form a universal joint as shown in FIG. I'm getting a fork.
【０００３】前記耳部を折り返すのは緊締用ボルトに螺
合するねじ孔部分の肉厚を厚くしてめねじの長さを長く
し、めねじの強度を保つためであるが、この耳部の折り
返し工程をなくしたものとして、特開昭５９−１２１２
２９号公報に示される自在継手がある。これは図９
（ａ），（ｂ）のような一対のタブ４および一対の耳部
７をもつ矩形板２を２枚一体に連結したブランクを用
い、押込加工によってその耳部に凹部１０および凸部２
３を形成するとともに、図１０（ａ），（ｂ）の如くタ
ブ４を矩形板２の中央部分に対して所要の高さの差が生
じるように加工し、これを図１１（ａ），（ｂ）の如く
矩形板２に曲げ加工を行った後、上下２体に分割し、真
直な端部をもつフォーク枝片８と平行な耳部７を有する
自在継手用フォークを得る方法が知られている。The reason why the lugs are folded back is to increase the wall thickness of the screw holes to be screwed into the tightening bolts, to lengthen the female screw, and to maintain the strength of the female screw. Japanese Patent Application Laid-Open No. Sho 59-1212 discloses a method in which the folding step is eliminated.
There is a universal joint disclosed in Japanese Patent Publication No. 29-29. This is Figure 9
As shown in (a) and (b), using a blank in which two rectangular plates 2 having a pair of tabs 4 and a pair of ears 7 are integrally connected, the recess 10 and the protrusion 2 are formed in the ears by pressing.
3 and the tab 4 is processed so as to have a required height difference with respect to the central portion of the rectangular plate 2 as shown in FIGS. 10 (a) and 10 (b). As shown in (b), a method is known in which a rectangular plate 2 is bent and then divided into upper and lower bodies to obtain a universal joint fork having a fork branch 8 having a straight end and a parallel ear 7. Have been.
【０００４】[0004]
【発明が解決しようとする課題】上述した図８（ａ），
（ｂ）に示す従来の自在継手は、耳部３を折り重ねる工
程と、折り曲げた先端部３ａをスプライン加工に支障を
起さないように切削する工程が必要であり、この工程に
大きな手数がかかる。またそのために長い耳部３が必要
でこれを矩形板２の両端に設けるため素材全体の長さが
長くなり、タブ４との関係から素材を打ち抜くときの材
料の歩留りが悪いという欠点がある。さらに素材を打ち
抜いた時の加工硬化作用により、以後の曲げ加工の際、
打抜部にワレが発生するので加工硬化を除去するための
焼なまし工程が必要である。SUMMARY OF THE INVENTION FIG.
The conventional universal joint shown in (b) requires a step of folding the ears 3 and a step of cutting the bent tip 3a so as not to hinder spline processing. Take it. In addition, long ears 3 are required for this, and since these are provided at both ends of the rectangular plate 2, the entire length of the material becomes longer, and the yield of the material when punching the material is poor due to the relation with the tab 4. Furthermore, due to the work hardening effect when punching the material, during the subsequent bending process,
Since cracks occur in the punched portion, an annealing step for removing work hardening is required.
【０００５】図１１（ａ），（ｂ）に示す自在継手用フ
ォークは、図７、図８の方法よりは工数が減り、歩留り
も向上するものの、耳部の板厚が充分でなく、またフォ
ーク枝片８は円筒状ハブの軸線方向からみて該ハブと同
芯状に曲げられておらず、ハブから略直線状に平行に延
びているので伝動の際のねじり応力に対し剛性が弱く、
また図７、図８のものと同様にタブ４の連結部分におけ
る加工硬化作用でワレ等が発生し易いという問題があっ
た。The universal joint fork shown in FIGS. 11 (a) and 11 (b) requires less man-hours and improves the yield than the methods shown in FIGS. 7 and 8, but the thickness of the lugs is not sufficient. When viewed from the axial direction of the cylindrical hub, the fork branch 8 is not bent concentrically with the hub, and extends substantially straight and parallel from the hub, so that the fork branch 8 has low rigidity against torsional stress during transmission,
7 and 8, there is a problem that cracks and the like are easily generated by the work hardening action at the connecting portion of the tab 4.
【０００６】[0006]
【課題を解決するための手段】本発明は、上述した従来
の欠点、問題点を解決したものであって、本発明におけ
る自在継手用フォークの製造方法は、矩形状平板の片側
部に一対のフォーク枝片となるタブと該平板の両端部に
一対の耳片とをもつように金属薄板素材を裁断する工程
と、前記耳片が互いに向き合うように前記矩形状平板を
前記タブと同芯的な円筒形状に曲げ込んでハブ管状部を
形成する工程と、十字軸の十字形腕を挿入し得るように
前記タブに２個の整合した貫通孔を穿孔するとともに前
記円筒形状に曲げられたハブ管状部の内周にスプライン
加工を施す切削工程とを有する自在継手用フォークの製
造方法において、前記タブと前記矩形状平板との連接部
を押圧加工する工程と、前記耳片の少なくとも一方のめ
ねじ部に相当する部分を片面側からポンチ押込変形によ
って、該ポンチ押込みによる該片面側の凹部の内径より
大外径の膨出部を生じせしめてその周囲の板厚を厚くす
る工程と、前記タブが前記ハブ管状部と略同芯の円形横
断面形状をもつように曲げ込む工程と、緊締ボルトを通
すために該耳片の一方にボルト挿通孔を、該耳片の他方
の前記ポンチ押込み部位に前記ポンチ押込みによる前記
片面側の凹部の内径より大径で前記膨出部の外径より小
径のねじ孔を整合して穿孔する切削工程とを有して成る
ものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional disadvantages and problems. A method of manufacturing a universal joint fork according to the present invention comprises a pair of rectangular flat plates on one side. A step of cutting the sheet metal material so as to have a tab serving as a fork branch and a pair of lugs at both ends of the flat plate; and forming the rectangular flat plate concentrically with the tab so that the lugs face each other. Forming a hub tubular portion by bending the hub into a cylindrical shape, and drilling two aligned through holes in the tab so that a cross arm of a cross shaft can be inserted therein, and the hub bent into the cylindrical shape. In a method for manufacturing a universal joint fork having a cutting step of performing spline processing on an inner periphery of a tubular portion, a step of pressing a connecting portion between the tab and the rectangular flat plate, and a step of pressing at least one of the lugs. Equivalent to thread Forming a bulge portion having an outer diameter larger than the inner diameter of the concave portion on the one side due to the pressing of the punch by pressing the punch from one side to increase the plate thickness around the step; Bending into a circular cross-sectional shape substantially concentric with the part, and inserting a bolt insertion hole into one of the ear pieces to pass a tightening bolt, and pressing the punch into the punch-pressing portion of the other of the ear pieces. A step of aligning and drilling a screw hole having a diameter larger than the inner diameter of the concave portion on one side and smaller than the outer diameter of the bulging portion.
【０００７】この場合、耳片部分の板厚を厚くする方法
として前述の耳片の少なくとも一方のめねじ部に相当す
る部分を片面側からポンチ押込変形させる工程に代え
て、前記耳片をその両端側から圧縮して肉盛変形させて
もよい。[0007] In this case, as a method of increasing the thickness of the ear piece, instead of the step of pressing and deforming at least one of the internal threads of the ear piece from one side, the ear piece is replaced by the punch. You may compress from both end sides and carry out a build-up deformation.
【０００８】[0008]
【作用】本発明においては、耳片の少なくともめねじ部
に相当する部分をポンチ加工あるいは圧縮加工等の塑性
加工で板厚を厚くするので、従来のスプライン加工時に
おける耳片折り曲げ端の機械加工が不要となり、工数が
節減され、かつ、素材の長さも小として材料の歩留向上
が図られる。フォーク枝片部分は円筒状ハブと略同芯に
内側に凹となるようにわん曲しているので、ねじり応力
に対して高い剛性を発揮でき、またタブの基部分の打抜
部を押圧することにより面粗度が向上し、焼なまし処理
が不要となる。According to the present invention, since at least a portion corresponding to the internal thread of the lug is made thicker by plastic working such as punching or compression, the bent end of the lug during conventional spline processing is machined. Is unnecessary, man-hours are reduced, and the length of the material is reduced, so that the yield of the material is improved. Since the fork branch is curved so as to be concave inward concentrically with the cylindrical hub, it can exhibit high rigidity against torsional stress and also presses the punched part of the base part of the tab This improves the surface roughness and eliminates the need for annealing.
【０００９】[0009]
【発明の実施の形態】次に本発明を、好適な実施形態に
ついて図面を参照して説明する。図１ないし図３は本発
明の第１の発明における実施例の製造工程を示した図で
ある。まず図１（ａ）に示す素材２５は金属の板材ある
いはコイル材からプレス加工で打ち抜かれ、矩形板２の
片側部（上側部）に一対のタブ４が、またその両端部に
耳片７が形成されている。なお、矩形板２の部分は、後
述するハブ管状部となり、タブ４はフォーク枝片、耳片
７はボルト締め付け用のハブ管状部の切離縁の位置で軸
線方向に沿ってのびる一対の平行突出部となる。この第
１の打抜工程に続いて図１（ｂ）に示す第２の工程で
は、プレスで打ち抜かれた切断面のうち、フォーク枝片
部分となるタブ４の付根部２１，２２ａ，２２ｂの切断
面箇所を破線の如く押圧して塑性変形を与え、面粗度を
向上させる。次に図１（ｃ）に示す第３の工程では、一
対の耳片７の少なくとも片側の耳片、つまり後工程で穿
けられるねじ孔に対応する箇所に、片側から細径ポンチ
を打ち込んで反対側へ突起（膨出部）９を形成する。図
１（ｄ）の第４の工程では、タブ４が一部円形横断面形
状をもつように該タブ４のみを、矩形板２の中心Ｃから
外側へややずれた点Ａを中心として曲率半径Ｒで円弧形
に曲げる。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of the present invention. FIG. 1 to FIG. 3 are views showing a manufacturing process of an embodiment according to the first invention of the present invention. First, a material 25 shown in FIG. 1A is punched out of a metal plate or coil material by press working, and a pair of tabs 4 is provided on one side (upper part) of the rectangular plate 2 and ear pieces 7 are provided on both ends thereof. Is formed. The portion of the rectangular plate 2 is a hub tubular portion to be described later, the tab 4 is a fork branch, and the ear piece 7 is a pair of parallel protrusions extending along the axial direction at the cutting edge of the hub tubular portion for bolting. Department. In the second step shown in FIG. 1 (b) following the first punching step, the roots 21, 22, a and 22b of the tabs 4 serving as fork branch pieces are cut out of the cut surface punched by the press. The cut surface is pressed as indicated by a broken line to apply plastic deformation, thereby improving the surface roughness. Next, in a third step shown in FIG. 1 (c), a small-diameter punch is driven from one side into at least one ear piece of the pair of ear pieces 7, that is, a position corresponding to a screw hole to be drilled in a later step. A protrusion (bulging portion) 9 is formed on the side. In the fourth step shown in FIG. 1D, only the tab 4 has a radius of curvature about a point A slightly shifted outward from the center C of the rectangular plate 2 so that the tab 4 has a partially circular cross-sectional shape. Bend into an arc shape with R.
【００１０】次の工程（第５工程）では、図１（ｅ）に
示すように、矩形板２を円筒形に成形する前段階とし
て、その中心Ｃのまわりに大略放物線状に、第１次の曲
げを行う。図１（ｆ）に示す第６の工程では、この放物
線状の矩形板２をより完全な円筒形にするために第２次
の曲げ加工を行ってハブ管状部１１を形成するととも
に、一対の耳片７，７がこのハブ管状部１１から半径方
向にほぼ平行に向い合うようにする。このとき第４の工
程で円弧形に曲げられたタブの部分はハブ管状部１１と
略同芯状にわん曲したフォーク枝片１２となる。以上に
よりプレスによる冷間鍛造工程が終了し、図２（ａ），
（ｂ），（ｃ）に示すような冷間鍛造完成品が得られ
る。In the next step (fifth step), as shown in FIG. 1 (e), as a step prior to forming the rectangular plate 2 into a cylindrical shape, the first plate is substantially parabolically shaped around its center C. Make a bend. In a sixth step shown in FIG. 1 (f), a second bending process is performed to form the parabolic rectangular plate 2 into a more complete cylindrical shape, thereby forming the hub tubular portion 11 and a pair of the tubular members. The lugs 7, 7 face the hub tubular portion 11 substantially in parallel in the radial direction. At this time, the tab portion bent in the arc shape in the fourth step becomes a fork branch piece 12 which is bent substantially concentrically with the hub tubular portion 11. With the above, the cold forging process by the press is completed, and FIG.
A cold forged product as shown in (b) and (c) is obtained.
【００１１】図２からも分かるようにこの鍛造品は、タ
ブ４から曲げ加工されて成形された一対のフォーク枝片
１２は所要の間隔ｄをもって互いに対向し、また該フォ
ーク枝片を連接し矩形板２から成形されたハブ管状部１
１は周上の１箇所で切離位置の両縁部が突き合せとな
り、この両縁部に続いて第６工程の曲げ加工で互いに平
行に半径方向に延在した耳片７が或る間隔Ｄをもって対
向している。As can be seen from FIG. 2, in this forged product, a pair of fork branches 12 formed by bending from the tab 4 are opposed to each other with a required distance d, and the fork branches are connected to form a rectangular shape. Hub tubular part 1 formed from plate 2
Reference numeral 1 denotes a single point on the circumference where the two edges at the separation position are abutted, and the ear pieces 7 extending in the radial direction parallel to each other by the bending process in the sixth step are arranged at a certain interval following the both edges. D.
【００１２】この後、第７の工程として切削およびスプ
ライン加工工程が施されて図３（ａ）〜（ｃ）に示す自
在継手用フォーク２０が得られる。即ち、フォーク枝片
１２，１２には十字軸の十字腕およびニードル入りカッ
プを嵌入すべき貫通孔１３が整合して穿孔され、耳片
７，７の一方にはボルト挿通孔１４および座１５が、他
方にはボルトねじ部と螺合するねじ孔１６が穿孔加工さ
れ、ハブ管状部１１の内周面にはスプライン軸と連結す
るためのスプライン溝１７が施されて自在継手の一部品
としてのフォーク２０が完成する。図１（ｃ）に示す第
３の工程でポンチ押込みによる環状の突起９の形成で図
３（ｃ）の如く耳片７のねじ孔１６の部分の板厚が厚く
なり、充分な長さのねじ孔が得られるので、従来のよう
に耳片を折り曲げることなく確実なボルト締めが可能と
なる。Thereafter, a cutting and spline processing step is performed as a seventh step to obtain a universal joint fork 20 shown in FIGS. 3 (a) to 3 (c). That is, the fork branch pieces 12, 12 are formed with a through hole 13 into which a cross arm of a cross shaft and a needle-containing cup are to be fitted, and a bolt insertion hole 14 and a seat 15 are formed in one of the ear pieces 7, 7. On the other hand, a screw hole 16 to be screwed with the bolt screw portion is drilled, and a spline groove 17 for connecting to a spline shaft is formed on the inner peripheral surface of the hub tubular portion 11 so as to be a part of the universal joint. The fork 20 is completed. In the third step shown in FIG. 1 (c), the thickness of the screw hole 16 of the ear piece 7 is increased as shown in FIG. Since the screw holes are obtained, the bolts can be securely tightened without bending the lugs as in the related art.
【００１３】図４〜図６は本発明の第２の発明の工程説
明図であり、この場合は矩形板２の両端に形成される耳
部７′，７′はその外縁が凸状に膨らんでいる。図１
（ａ），（ｂ）と同じ第１、第２の工程（図４（ａ），
（ｂ））を経た後、図４（ｃ）の第３の工程で耳片
７′，７′の両端を素材の打抜面に対して直角な方向に
圧縮力を加え、局部据込加工を行うことにより、めねじ
部周辺の板面形状を変形させ、突面９′を形成する。こ
の場合は両耳片の対向部分が同時に該突面により厚肉状
態となる。以後は図１（ｄ）〜（ｆ）、図２、図３で述
べたのと同様の加工を行う。なお図５は図１（ｆ）に、
図６は図３（ｃ）に対応する。耳片の板厚増加により確
実なボルト締めが可能となる。FIGS. 4 to 6 are process explanatory views of the second invention according to the present invention. In this case, ear portions 7 ', 7' formed at both ends of the rectangular plate 2 have outer edges bulging in a convex shape. In. FIG.
First and second steps (FIGS. 4A and 4B) which are the same as those in FIGS.
After (b)), in the third step of FIG. 4 (c), a compressive force is applied to both ends of the lugs 7 ', 7' in a direction perpendicular to the blanking surface of the material, and local upsetting By doing so, the shape of the plate surface around the female screw portion is deformed to form the protruding surface 9 '. In this case, the opposing portions of both ear pieces are simultaneously made thick by the protruding surfaces. Thereafter, processing similar to that described with reference to FIGS. 1D to 1F, 2 and 3 is performed. FIG. 5 shows FIG.
FIG. 6 corresponds to FIG. An increase in the thickness of the lug enables reliable bolt tightening.
【００１４】[0014]
【発明の効果】以上説明したように本発明によれば、
（イ）耳片に塑性加工を施し、該耳片のねじ孔該当部に
突部を加工することにより、ねじ孔の補強、確実なボル
ト締めができ、（ロ）前記ねじ孔の補強によって従来の
ような耳片の折り返し加工、スプライン加工のための折
り返し端の前処理（切削）が不要となり、かつ耳片部分
が小形化、素材長さの短縮化がもたらされ、素材の打抜
加工において材料の歩留りが向上する。また（ハ）フォ
ーク枝片付根部の打抜切断面を押圧し面粗度を向上させ
ることにより、その曲げに伴なうクラックの発生を防止
でき、焼なまし工程を省略でき、さらに（ニ）フォーク
枝片はその軸方向に垂直な断面が内側に凹となるように
わん曲しているので、使用時のねじり応力に対して高い
剛性を発揮するなど、実用上大きな利点、効果がもたら
される。As described above, according to the present invention,
(A) The ear piece is subjected to plastic working, and the projection is formed at the portion corresponding to the screw hole of the ear piece, whereby the screw hole can be reinforced and the bolt can be securely tightened. No need for pre-processing (cutting) the folded end of the ear piece and spline processing as described above, and the size of the ear piece is reduced and the material length is shortened. In this case, the material yield is improved. (C) By pressing the punched cut surface of the root portion of the fork branch to improve the surface roughness, it is possible to prevent the occurrence of cracks due to the bending, to omit the annealing step, and to further reduce the (d) ) The fork branch is curved so that its cross section perpendicular to the axial direction is concave inward, so it has high practical advantages such as high rigidity against torsional stress during use. It is.
【図１】本発明の第１の発明における自在継手用フォー
クの冷間鍛造の工程説明図である。FIG. 1 is an explanatory view of a process of cold forging a fork for a universal joint according to the first invention of the present invention.
【図２】フォーク中間品たる冷間鍛造完成品の一部裁断
正面図、側面図および横断面図である。FIG. 2 is a partially cut front view, a side view, and a cross-sectional view of a cold forged finished product as a fork intermediate product.
【図３】切削完了したフォーク完成品の一部裁断正面
図、側面図および横断面図である。FIG. 3 is a partially cut front view, a side view, and a cross-sectional view of a completed fork that has been cut.
【図４】本発明の第２の発明における自在継手用フォー
クの冷間鍛造の一部工程を示す説明図である。FIG. 4 is an explanatory view showing some steps of cold forging of a fork for a universal joint according to the second invention of the present invention.
【図５】本発明の第２の発明における自在継手用フォー
クの冷間鍛造の一部工程を示す説明図である。FIG. 5 is an explanatory view showing some steps of cold forging of a fork for a universal joint according to the second invention of the present invention.
【図６】本発明の第２の発明におけるフォーク完成品の
横断面図である。FIG. 6 is a transverse sectional view of a completed fork product according to the second invention of the present invention.
【図７】従来の自在継手用フォークの素材の平面図であ
る。FIG. 7 is a plan view of a material for a conventional universal joint fork.
【図８】従来の自在継手用フォークの一部裁断側面図お
よび横断面図である。FIG. 8 is a partially cut-away side view and a cross-sectional view of a conventional universal joint fork.
【図９】他の従来例によるフォーク製造工程の一部を示
す図である。FIG. 9 is a diagram showing a part of a fork manufacturing process according to another conventional example.
【図１０】他の従来例によるフォーク製造工程の一部を
示す図である。FIG. 10 is a diagram showing a part of a fork manufacturing process according to another conventional example.
【図１１】他の従来例によるフォーク製造工程の一部を
示す図である。FIG. 11 is a diagram showing a part of a fork manufacturing process according to another conventional example.
２…矩形板 ４…タブ ７…耳片 ９…突起 １１…ハブ管状部 １２…フォーク枝片 １３…貫通孔 １４…ボルト挿通孔 １６…ねじ孔 １７…スプライン溝 ２０…自在継手用フォーク ２５…素材 DESCRIPTION OF SYMBOLS 2 ... Rectangular plate 4 ... Tab 7 ... Ear piece 9 ... Protrusion 11 ... Hub tubular part 12 ... Fork branch piece 13 ... Through hole 14 ... Bolt insertion hole 16 ... Screw hole 17 ... Spline groove 20 ... Universal joint fork 25 ... Material
Claims (2)
となるタブと該平板の両端部に一対の耳片とをもつよう
に金属薄板素材を裁断する工程と、前記耳片が互いに向
き合うように前記矩形状平板を前記タブと同芯的な円筒
形状に曲げ込んでハブ管状部を形成する工程と、十字軸
の十字形腕を挿入し得るように前記タブに２個の整合し
た貫通孔を穿孔するとともに前記円筒形状に曲げられた
ハブ管状部の内周にスプライン加工を施す切削工程とを
有する自在継手用フォークの製造方法において、前記タ
ブと前記矩形状平板との連接部を押圧加工する工程と、
前記耳片の少なくとも一方のめねじ部に相当する部分を
片面側からポンチ押込変形によって、該ポンチ押込みに
よる該片面側の凹部の内径より大外径の膨出部を生じせ
しめてその周囲の板厚を厚くする工程と、前記タブが前
記ハブ管状部と略同芯の円形横断面形状をもつように曲
げ込む工程と、緊締ボルトを通すために該耳片の一方に
ボルト挿通孔を、該耳片の他方の前記ポンチ押込み部位
に前記ポンチ押込みによる前記片面側の凹部の内径より
大径で前記膨出部の外径より小径のねじ孔を整合して穿
孔する切削工程とを有することを特徴とする自在継手用
フォークの製造方法。1. A step of cutting a sheet metal material so as to have a pair of fork branch tabs on one side of a rectangular flat plate and a pair of lugs at both ends of the flat plate. Bending the rectangular flat plate into a cylindrical shape concentric with the tab so as to face each other to form a hub tubular portion; and two tabs aligned with the tab so that a cross arm of a cross shaft can be inserted. A method for manufacturing a universal joint fork having a cutting step of forming a through hole and performing spline processing on an inner periphery of the hub tubular portion bent into the cylindrical shape, wherein a connecting portion between the tab and the rectangular flat plate is formed. Pressing process;
A portion corresponding to at least one female thread portion of the ear piece is punch-deformed from one surface side to form a bulge portion having an outer diameter larger than the inner diameter of the concave portion on the one surface side due to the punch press. A step of increasing the thickness, a step of bending the tab so as to have a circular cross-sectional shape substantially concentric with the hub tubular portion, and a bolt insertion hole in one of the lugs for passing a tightening bolt. A cutting step of aligning and drilling a screw hole having a diameter larger than the inside diameter of the concave portion on one side and smaller than the outside diameter of the bulging portion at the other punch-pressed portion of the ear piece by pressing the punch. A method for producing a universal joint fork.
となるタブと該平板の両端部に一対の耳片とをもつよう
に金属薄板素材を裁断する工程と、前記耳片が互いに向
き合うように前記矩形状平板を前記タブと同芯的な円筒
形状に曲げ込んでハブ管状部を形成する工程と、十字軸
の十字形腕を挿入し得るように前記タブに２個の整合し
た貫通孔を穿孔するとともに前記円筒形状に曲げられた
ハブ管状部の内周にスプライン加工を施す切削工程とを
有する自在継手用フォークの製造方法において、前記タ
ブと前記矩形状平板との連接部を押圧加工する工程と、
前記耳片をその両端側から圧縮して該耳片の板厚を厚く
する工程と、前記タブが前記ハブ管状部と略同芯の円形
横断面形状をもつように曲げ込む工程と、緊締ボルトを
通すために該耳片の一方にボルト挿通孔を、該耳片の他
方にねじ孔を整合して穿孔する切削工程とを有すること
を特徴とする自在継手用フォークの製造方法。2. A step of cutting a sheet metal material so as to have a pair of tabs serving as fork branches on one side of a rectangular flat plate and a pair of lugs at both ends of the flat plate. Bending the rectangular flat plate into a cylindrical shape concentric with the tab so as to face each other to form a hub tubular portion; and two tabs aligned with the tab so that a cross arm of a cross shaft can be inserted. A method for manufacturing a universal joint fork having a cutting step of forming a through hole and performing spline processing on an inner periphery of the hub tubular portion bent into the cylindrical shape, wherein a connecting portion between the tab and the rectangular flat plate is formed. Pressing process;
Compressing the lugs from both ends thereof to increase the thickness of the lugs; bending the tabs into a circular cross-sectional shape substantially concentric with the hub tubular portion; A bolt insertion hole in one of the ear pieces and a cutting step in which a screw hole is aligned with the other of the ear pieces in order to allow the through hole to pass therethrough.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11099430A JP3132503B2 (en) | 1999-04-06 | 1999-04-06 | Manufacturing method of universal joint fork |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11099430A JP3132503B2 (en) | 1999-04-06 | 1999-04-06 | Manufacturing method of universal joint fork |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63185222A Division JPH0788859B2 (en) | 1988-07-25 | 1988-07-25 | Manufacturing method of universal joint and fork for universal joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000202721A true JP2000202721A (en) | 2000-07-25 |
| JP3132503B2 JP3132503B2 (en) | 2001-02-05 |
Family
ID=14247239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11099430A Expired - Lifetime JP3132503B2 (en) | 1999-04-06 | 1999-04-06 | Manufacturing method of universal joint fork |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3132503B2 (en) |
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|---|---|---|---|---|
| JP2010188502A (en) * | 2009-02-20 | 2010-09-02 | Nsk Ltd | Method for producing yoke for universal joint |
| JP2011220398A (en) * | 2010-04-07 | 2011-11-04 | Nsk Ltd | Yoke for cross-type universal joint and method of manufacturing the same |
| CN104439991A (en) * | 2014-11-19 | 2015-03-25 | 江苏恒义汽配制造有限公司 | Machining method for shifting fork differential between wheels of heavy-duty car |
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| CN105598645A (en) * | 2016-01-27 | 2016-05-25 | 太仓旺美模具有限公司 | Cold forging technology of nut plate |
| CN108453471A (en) * | 2017-02-17 | 2018-08-28 | 博尔霍夫.奥塔陆股份有限公司 | The method of riveting nut and the such nut of manufacture |
| CN111496157A (en) * | 2020-05-06 | 2020-08-07 | 台州兴隆传动股份有限公司 | Cold extrusion pressing forming process of automobile universal joint fork |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010188502A (en) * | 2009-02-20 | 2010-09-02 | Nsk Ltd | Method for producing yoke for universal joint |
| JP2011220398A (en) * | 2010-04-07 | 2011-11-04 | Nsk Ltd | Yoke for cross-type universal joint and method of manufacturing the same |
| CN104439991A (en) * | 2014-11-19 | 2015-03-25 | 江苏恒义汽配制造有限公司 | Machining method for shifting fork differential between wheels of heavy-duty car |
| CN104690505A (en) * | 2015-02-10 | 2015-06-10 | 天津宝骏科技发展有限公司 | Process for machining reinforced plate in beam on radiator cabinet frame |
| CN105598645A (en) * | 2016-01-27 | 2016-05-25 | 太仓旺美模具有限公司 | Cold forging technology of nut plate |
| CN108453471A (en) * | 2017-02-17 | 2018-08-28 | 博尔霍夫.奥塔陆股份有限公司 | The method of riveting nut and the such nut of manufacture |
| CN111496157A (en) * | 2020-05-06 | 2020-08-07 | 台州兴隆传动股份有限公司 | Cold extrusion pressing forming process of automobile universal joint fork |
| CN112621117A (en) * | 2020-12-08 | 2021-04-09 | 莱芜钢铁集团淄博锚链有限公司 | Anchor chain kenter processing method |
| CN112621117B (en) * | 2020-12-08 | 2023-05-12 | 莱芜钢铁集团淄博锚链有限公司 | Anchor chain Kent processing method |
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| Publication number | Publication date |
|---|---|
| JP3132503B2 (en) | 2001-02-05 |
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