JPH068652B2 - Yoke member for universal joint and its manufacturing method - Google Patents
Yoke member for universal joint and its manufacturing methodInfo
- Publication number
- JPH068652B2 JPH068652B2 JP4400885A JP4400885A JPH068652B2 JP H068652 B2 JPH068652 B2 JP H068652B2 JP 4400885 A JP4400885 A JP 4400885A JP 4400885 A JP4400885 A JP 4400885A JP H068652 B2 JPH068652 B2 JP H068652B2
- Authority
- JP
- Japan
- Prior art keywords
- hollow shaft
- hole
- arm
- forming
- shaft portion
- 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.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
- F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
- F16D3/382—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another constructional details of other than the intermediate member
- F16D3/387—Fork construction; Mounting of fork on shaft; Adapting shaft for mounting of fork
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/762—Coupling members for conveying mechanical motion, e.g. universal joints
- B21K1/765—Outer elements of coupling members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明はユニバーサルジョイント用ヨーク、特に、軸
をスライド可能に結合する中空軸を有するヨーク部材と
その製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal joint yoke, and more particularly to a yoke member having a hollow shaft for slidably coupling the shaft and a method for manufacturing the yoke member.
（従来の技術） 従来、この種中空軸付きヨークとしては略コ字形状のヨ
ーク部にパイプ材等からなる中空軸部材を溶着手段によ
り止着する構成か、第１０図および第１１図に示すよう
に熱間鍛造して軸付きヨーク１０３の粗形材１０１を成
形した後、同粗形材１０１の周縁に付帯発生したバリ１
０２をバリ抜き工程で除去した後、機械加工が施されて
中空軸付きヨークが形成されていた。(Prior Art) Conventionally, as a yoke with a hollow shaft of this kind, a structure in which a hollow shaft member made of a pipe material or the like is fixed to a substantially U-shaped yoke portion by a welding means is shown in FIGS. 10 and 11. After forging by hot forging to form the rough material 101 of the yoke 103 with a shaft, burrs 1 incidental to the peripheral edge of the rough material 101 are formed.
After removing 02 in the deburring step, machining was performed to form a yoke with a hollow shaft.
（解決しようとする問題点） しかし、この溶着手段によるものにあっては、溶接精度
および溶接部の強度にバラツキを生じて品質の確保が極
めて困難で、このためコストが高くなる問題点があり、
また、熱間鍛造によるものにあっては、熱間鍛造方向が
一般的には第10図図示矢印方向であるため、軸部１０４
の穿孔加工は全切削しなければならないため加工コスト
が高くなり、また、熱間鍛造においては必ずバリが発生
し、また、成形精度がそれ程高くないため機械加工時の
切削代が多く、穿孔加工と相俟って材料歩留りが極めて
悪くなる等の問題点があった。(Problems to be solved) However, in the case of using this welding means, there is a problem in that it is extremely difficult to secure quality due to variations in welding accuracy and strength of the welded portion, which causes a cost increase. ,
Further, in the case of hot forging, since the hot forging direction is generally in the direction of the arrow shown in FIG.
Since the piercing process requires the entire cutting, the processing cost is high, and burrs are always generated in hot forging, and since the forming accuracy is not so high, there are many cutting allowances during machining, Combined with this, there was a problem that the material yield was extremely poor.
（問題点を解決するための手段） そこで本発明は、第１の目的としてヨーク部と中空軸部
とを一体成形して強度に優れたユニバーサルジョイント
用のヨーク部材を提供すること。第２の目的として寸法
精度が良好で加工工数を少く製造し得るとともに、材料
歩留りの良好なヨーク部材の製造方法を提供することに
あり、この両目的の実現のために、本発明は以下を要件
として構成される。(Means for Solving the Problems) Therefore, a first object of the present invention is to provide a yoke member for a universal joint having excellent strength by integrally forming a yoke portion and a hollow shaft portion. A second object of the present invention is to provide a method for manufacturing a yoke member which has good dimensional accuracy and can be manufactured with a small number of processing steps and has a good material yield. Configured as a requirement.
すなわち、第１の目的の実現のために、深孔あるはスプ
ライン孔を貫通成形した中空軸部の一端に同中空軸部の
軸心に直交状の基部とこの基部の四周に厚肉部と薄肉部
とにより方形筒形状で前記中空軸部とは反対方向に延出
するアーム粗成形部を一体に備え、前記アーム粗成形部
と中空軸部とは冷間前後方押出しにより一体に成形した
ことである。That is, in order to realize the first object, a deep shaft or a spline hole is formed at one end of a hollow shaft portion through which a base portion orthogonal to the axis of the hollow shaft portion and a thick-walled portion on the four circumferences of the base portion are formed. The thin-walled portion and the arm rough-forming portion, which has a rectangular tubular shape and extends in the direction opposite to the hollow shaft portion, are integrally provided, and the arm rough-forming portion and the hollow shaft portion are integrally formed by cold front-back extrusion. That is.
また、第２の目的の実現のため、 (ａ)前記ヨーク部材の全体体積とほぼ等しい体積の素材
を材料取りする材料取り工程と、 (ｂ)前記素材を冷間後方押出しして有底円筒形状に成形
するとともに、同底部を打抜き成形して円筒状の予成形
品に成形する孔成形工程と、 (ｃ)同一軸線上に方形状のアーム成形型孔と円形状の軸
成形型孔とを連通形成したダイスと、前記アーム成形型
孔の一方の対応する側壁と対設して薄肉部を成形する側
面と他方の対応する側壁と対設して厚肉部を成形する側
面とによりなるパンチの先端に前記予成形品の孔に挿入
可能でかつ前記軸成形型孔と対設するマンドレルを設け
て、該パンチにより前記予成形品を冷間前後方押出しし
てアーム粗成形部と中空軸部とを一体成形する冷間前後
方押出し工程とによること、としたのである。Further, in order to realize the second object, (a) a material removing step of removing a material having a volume substantially equal to the entire volume of the yoke member, and (b) a bottomed cylinder obtained by cold backward extruding the material. A hole forming step of forming into a shape and punching the same bottom to form a cylindrical preformed product, and (c) a square arm forming die hole and a circular shaft forming die hole on the same axis. A side surface for forming a thin portion by facing one side wall of the arm forming die hole and a side surface for forming a thick portion by facing the other side wall. A mandrel, which can be inserted into the hole of the preformed product and is opposed to the shaft forming die hole, is provided at the tip of the punch, and the punch is used to extrude the preformed product in the cold front and rear direction to form a hollow arm rough forming portion and a hollow portion. According to the cold front rear extrusion process of integrally molding the shaft part, Than it is.
（実施例） 次に、本発明の実施例を図面にしたがって説明する。(Example) Next, the Example of this invention is described according to drawing.
第１図および第２図は本発明に係る中空軸付きヨーク１
の具体例を示すもので、この中空軸付きヨーク１は中空
軸部２とヨーク部４とが一体に形成され、中空軸部２に
はその軸心に沿ってトルク伝達および軸をスライド可能
とするためのスプライン孔３が冷間鍛造またはブローチ
加工により貫設されている。なお、この中空軸部２は所
定の長さＨを有し、安定の外形Ｄおよび孔径ｄに形成さ
れている。この中空軸部２の一端にはヨーク部４のヨー
ク基部５が形成され、同ヨーク基部５の両側には中空軸
部２の軸線に平行で等長Ｌの一対のアーム６，６が中空
軸部２とは正反対方向へ延出形成されるとともに、この
アーム６，６間は距離（回転径）Ｒに形成されるととも
に、同アーム６は幅Ｗで厚さＴに形成されている。ま
た、アーム６の先端側の所定の位置にはベアリングを保
持するための孔７が対応して貫設されている。このよう
に形成された本例中空軸付きヨーク１は相手ヨーク８に
対し十字軸９およびニードルベアリング１０を介して回
転可能に連繋されている。なお、１１はシール部材であ
る。1 and 2 show a yoke 1 with a hollow shaft according to the present invention.
In this yoke 1 with a hollow shaft, a hollow shaft portion 2 and a yoke portion 4 are integrally formed, and the hollow shaft portion 2 is capable of transmitting torque and sliding the shaft along the axis thereof. The spline hole 3 is formed by cold forging or broaching. The hollow shaft portion 2 has a predetermined length H and is formed with a stable outer shape D and a hole diameter d. A yoke base portion 5 of the yoke portion 4 is formed at one end of the hollow shaft portion 2, and a pair of arms 6, 6 of equal length L parallel to the axis of the hollow shaft portion 2 are formed on both sides of the yoke base portion 5. The arm 6 is formed so as to extend in the opposite direction to the portion 2, a distance (rotation diameter) R is formed between the arms 6 and 6, and the arm 6 is formed to have a width W and a thickness T. In addition, a hole 7 for holding a bearing is correspondingly provided at a predetermined position on the tip side of the arm 6. The hollow shaft-equipped yoke 1 of this embodiment thus formed is rotatably connected to the mating yoke 8 via the cross shaft 9 and the needle bearing 10. In addition, 11 is a seal member.
次に、上記のように構成された本例中空軸付きヨーク１
を冷間鍛造によって製造する方法について説明する。こ
の冷間鍛造による加工工程としては(1)材料取り工程、
(2)孔成形工程、(3)前後方押出し工程、(4)トリム加工
工程の各工程とよりなっている。Next, the yoke 1 with a hollow shaft of the present example configured as described above
A method of manufacturing the steel by cold forging will be described. As the processing step by this cold forging, (1) material taking step,
It is composed of (2) hole forming step, (3) front and rear extrusion step, and (4) trim processing step.
１２は冷間鍛造用素材であって、材料取り工程において
所定の径Ｄ１の丸棒を所定の長さｈ１に切断されて材料
取りされたもので、この素材１２の体積は中空軸部２お
よびヨーク部４を成形するに足る体積に材料取りされて
いる。このように材料取りされた素材１２は孔成形工程
において第５図に示すように円筒状の予成形品１３に冷
間鍛造される。Reference numeral 12 is a material for cold forging, which is obtained by cutting a round bar having a predetermined diameter D1 into a predetermined length h1 in a material removing step, and the material 12 has a volume of the hollow shaft portion 2 and The material is taken in a volume sufficient to mold the yoke portion 4. The material 12 thus obtained is cold forged into a cylindrical preform 13 as shown in FIG. 5 in the hole forming step.
この孔成形工程では素材１２を冷間鍛造により円筒状の
予成形品１３に成形するもので、先ず素材１２を後方押
出しして底部１３ａを有する予備素材１３Ａに成形し、
その円形中心部に直径ｄ１の凹状孔１４ａが凹設され、
この予備素材１３Ａの径は径Ｄ１でその高さｈ２は素材
１２の高さｈ１より高く形成されている。次に予備素材
１３Ａはその底部１３ａが直径ｄ１で打抜き加工されて
孔１４が貫設されて予成形品１３が成形される。このよ
うに孔１４を成形された予成形品１３は前後方押出し工
程において第６図に示すヨーク部材１５に成形される。In this hole forming step, the material 12 is formed into a cylindrical preform 13 by cold forging. First, the material 12 is extruded backward to form a preliminary material 13A having a bottom portion 13a,
A concave hole 14a having a diameter d1 is provided in the center of the circle,
The spare material 13A has a diameter D1 and a height h2 higher than the height h1 of the material 12. Next, the preform 13A is punched at a bottom 13a thereof with a diameter d1 to form a hole 14 and a preform 13 is formed. The preformed product 13 having the holes 14 formed in this manner is formed into the yoke member 15 shown in FIG. 6 in the front and rear extrusion process.
この前後方押出し工程においては予成形品１３を冷間前
後方押出してアーム粗成形部１６と中空軸部１９とに一
体成形するもので、このアーム粗成形部１６は後方押出
しにより図示のようにアーム６を形成する厚肉部１７と
余肉となる薄肉部１８とにより略方形筒形状に形成さ
れ、この厚肉部１７間は中空軸付きヨーク１のアーム
６，６間の距離（回転径）Ｒに形成されるとともに、同
厚肉部１７はアーム６の厚さＴに形成され、また、厚肉
部の幅Ｗ１は薄肉部１８厚さ分丈余分の幅に形成されて
いる。また、中空軸部１９は前方押出しにより成形され
るもので、その外形は中空軸付きヨーク１の中空軸部２
の外径Ｄで孔１４はその径ｄ１＝ｄを保持した状態で深
孔２０を有する中空軸部１９に形成されている。しかし
て、このヨーク部材１５を成形する装置としては同一軸
線上にダイス２１とパンチ２５とが対向して配設され、
ダイス２１はアーム粗成形部１６を成形する方形状（Ｗ
１×Ｒ）のアーム成形型孔２２と同型孔２２と連続して
中空軸部１９を成形する直径Ｄの軸成形型孔２３が形成
され、型孔２３の下部にはヨーク部材１５を取出すため
のエジェクタピン２４が図示上下方向に移動可能に挿入
されている。また、パンチ２５は軸線上に沿って進退さ
れるもので、その先端部形状は方形状の筒形状のアーム
粗成形部１６を成形すべく断面略方形状に形成され、そ
の先端面２６は軸線に直角な平坦面に形成されるととも
に、一方の対応する側面２７はアーム成形型孔２２の壁
面２２ａとの間に薄肉部１８を形成する間隔を有して設
けられ、また、他方の側面２８はアーム成形型孔２２の
壁面２２ｂとの間に厚肉部１７を成形する隙間Ｔを有し
て設けられている。また、パンチ２５の先端面２６側に
は軸線に沿って予成形品１３の孔１４に挿入可能であっ
て、中空軸部１９の深孔２０を成形する所定の長さを有
し、径ｄのマンドレル２９が一体に延設されている。こ
のマンドレル２９はパンチ２５と一体の前進されて同パ
ンチ２５により前方押出しされる素材をダイス２１の軸
成形型孔２３の側壁２３ａとの間隙により深い孔２０を
有する中空軸部１９成形するものである。In this front / rear extrusion step, the preformed product 13 is cold front / rear extruded to be integrally molded with the arm rough molding portion 16 and the hollow shaft portion 19. The arm rough molding portion 16 is subjected to rear extrusion as shown in the drawing. The thick-walled portion 17 forming the arm 6 and the thin-walled portion 18 serving as a surplus are formed into a substantially rectangular tubular shape, and the space between the thick-walled portions 17 is the distance between the arms 6 and 6 of the yoke 1 with a hollow shaft (rotation diameter). ) R, the thick portion 17 is formed to the thickness T of the arm 6, and the width W1 of the thick portion is formed to be an extra width corresponding to the thickness of the thin portion 18. The hollow shaft portion 19 is formed by forward extrusion, and its outer shape is the hollow shaft portion 2 of the yoke 1 with a hollow shaft.
The hole 14 having the outer diameter D is formed in the hollow shaft portion 19 having the deep hole 20 while maintaining the diameter d1 = d. As a device for molding the yoke member 15, the die 21 and the punch 25 are arranged so as to face each other on the same axis.
The die 21 has a rectangular shape (W
(1 × R) arm forming die hole 22 and a shaft forming die hole 23 having a diameter D for forming the hollow shaft portion 19 are formed continuously with the same die hole 22, and the yoke member 15 is taken out below the die hole 23. The ejector pin 24 is inserted movably in the vertical direction in the figure. Further, the punch 25 is advanced and retracted along the axial line, and the tip end shape thereof is formed in a substantially square shape in cross section so as to form the square arm-shaped rough molding portion 16 and the tip end surface 26 thereof has an axial line. Is formed as a flat surface at right angles to one side face 27, and one corresponding side face 27 is provided with a space for forming a thin portion 18 between the side face 27 of the arm forming die hole 22 and the other side face 28. Is provided with a gap T between the wall surface 22b of the arm forming die hole 22 and the thick portion 17 for forming. The punch 25 has a tip surface 26 side which can be inserted into the hole 14 of the preform 13 along the axis and has a predetermined length for forming the deep hole 20 of the hollow shaft portion 19 and has a diameter d. Mandrel 29 is integrally extended. The mandrel 29 is a unit for forming a hollow shaft portion 19 having a deep hole 20 in a gap with the side wall 23a of the shaft forming die hole 23 of the die 21 by advancing integrally with the punch 25 and extruding forwardly by the punch 25. is there.
このように構成されたダイス２１およびパンチ２５によ
り上記予成形品１３を前後方押出し成形するには、先
ず、予成形品１３をダイス２１のアーム成形型孔２２に
装填する。このとき予成形品１３の外周は型孔２２の壁
面２２ａ，２２ｂに４点支持されるとともに、孔１４の
中心は軸線に整合されている。しかる後、パンチ２５を
図示下方へ前進するとパンチ２５の先端に設けたマンド
レル２９も一体の前進されるとともに、同マンドレル２
９は予成形品１３の孔１４に挿入され、パンチ２５の先
端面２６は予成形品１３の上面を所定の圧力で押圧す
る。この時マンドレル２９の先端は軸成形型孔２３に臨
まれている。この押圧力により材料は軸成形型孔２３と
マンドレル２９とで形成される隙間より前方（図示下
方）すなわち軸成形型孔２３側へ流出されて深孔２０を
有する中空軸部１９が成形されるとともに、パンチ２５
とアーム成形型孔２２とで形成される隙間を後方（図示
上方）へ流動して厚肉部１７と薄肉部１８とからなる方
形筒形状のアーム粗成形部１６が成形されてヨーク部材
１５が成形される。この前後方押出しにより材料のファ
イバーフローはヨーク部材１５の軸線に沿ってアーム粗
成形部１６から中空軸部１９まで連続形成されてヨーク
部材１５全体の強度を向上することができ、とくに、ア
ーム粗成形部１６の成形はアーム成形型孔２２の側壁２
２ａとパンチ２５の側面２７との隙間を小さく形成して
薄肉部１８を成形する構成としたものであるから、この
隙間が一種のフラッシュ部を構成して後方押出しにより
流動する材料はこの隙間への流出の抵抗が大きいからア
ーム成形型孔２２の側壁２２ｂとパンチ２５の側面２８
との厚肉部１７を成形する隙間Ｔへ材料が充分に充満さ
れて押出し成形され欠肉のない厚肉部１７を成形するこ
とができる。In order to extrude the preform 13 by the die 21 and the punch 25 configured as described above, the preform 13 is first loaded into the arm forming die hole 22 of the die 21. At this time, the outer periphery of the preformed product 13 is supported by the wall surfaces 22a and 22b of the mold hole 22 at four points, and the center of the hole 14 is aligned with the axis. After that, when the punch 25 is advanced downward in the drawing, the mandrel 29 provided at the tip of the punch 25 is also integrally advanced, and the mandrel 2
9 is inserted into the hole 14 of the preformed product 13, and the tip surface 26 of the punch 25 presses the upper surface of the preformed product 13 with a predetermined pressure. At this time, the tip of the mandrel 29 is exposed to the shaft forming die hole 23. Due to this pressing force, the material flows out from the gap formed by the shaft forming die hole 23 and the mandrel 29 forward (downward in the drawing), that is, toward the shaft forming die hole 23 side, and the hollow shaft portion 19 having the deep hole 20 is formed. With punch 25
And the arm forming die hole 22 flow backward (upward in the drawing) to form a rectangular tubular arm rough forming portion 16 including a thick portion 17 and a thin portion 18 to form a yoke member 15. Molded. By this front / rear extrusion, the fiber flow of the material is continuously formed along the axis of the yoke member 15 from the arm rough molding portion 16 to the hollow shaft portion 19, so that the strength of the entire yoke member 15 can be improved. The forming of the forming portion 16 is performed by the side wall 2 of the arm forming die hole 22.
Since the thin portion 18 is formed by forming a small gap between the side 2a of the punch 25 and the side surface 27 of the punch 25, this gap constitutes a kind of flash portion and the material that flows by backward extrusion flows into this gap. Side wall 22b of the arm forming die hole 22 and the side surface 28 of the punch 25 because the resistance against the outflow of the punch is large.
It is possible to form the thick wall portion 17 having no wall thickness by being sufficiently filled with the material in the gap T for molding the thick wall portion 17 and extruded.
このようにしてアーム組成形部１６と中空軸部１９とが
成形されるとパンチ２５は後退されるとともに、エジェ
クターピン２４が作動されてヨーク部材１５はダイス２
１より払い出される。When the arm composition shaped portion 16 and the hollow shaft portion 19 are formed in this manner, the punch 25 is retracted, and the ejector pin 24 is actuated to move the yoke member 15 to the die 2
It is paid out from 1.
かくして成形されたヨーク部材１５はトリム加工工程に
おいて第９図に示すようにそのアーム組成形部１６の薄
肉部１８が排除されるとともに、厚肉部１７がアーム６
の形状にプレス加工される。しかして、トリム加工され
たヨーク部材１５は機械加工工程においてヨーク基部
５、ベアリング孔７およびスプライン孔３が加工されて
中空軸付きヨーク１が形成される。In the trimming process of the yoke member 15 thus formed, as shown in FIG. 9, the thin portion 18 of the arm composition shaped portion 16 is eliminated and the thick portion 17 is formed in the arm 6
It is pressed into the shape of. Then, in the yoke member 15 that has been trimmed, the yoke base 5, the bearing hole 7, and the spline hole 3 are processed in the machining process to form the yoke 1 with the hollow shaft.
このように冷間鍛造で得られるヨーク部材１５は予成形
品の加工硬化およびファイバーフローの改質によりヨー
ク部材１５全体の強度が大幅に向上されて耐用度に優れ
たヨーク部材１５を得ることができる。As described above, the yoke member 15 obtained by cold forging has a significantly improved strength of the entire yoke member 15 due to work hardening of the preformed product and modification of the fiber flow, so that the yoke member 15 having excellent durability can be obtained. it can.
次に、このヨーク部材を製造する上記方法は、予成形品
１３を冷間前後方押出し加工によりアーム粗成形部１６
と中空軸部１９とに一体成形するもので、このアーム粗
成形部１６は後方押出し加工によりアーム６を形成する
厚肉部１７と余肉となる薄肉部１８とにより略方形筒形
状に形成され、また、中空軸部１９は前方押出し加工に
より成形されるもので、その外径は中空軸付きヨーク１
の中空軸部２の外径Ｄで孔１４はその径ｄ１＝ｄを保持
した状態で深孔２０を有する中空時部１９に形成されて
いる。したがって、アーム粗成形部１６の成形はアーム
成形型孔２２の側壁２２ａとパンチ２５の側面２７との
隙間を小さく形成して薄肉部１８を成形する構成とした
ものであるから、この隙間が一種のフラッシュ部を構成
して後方押出しにより流動する材料はこの隙間への流出
の抵抗が大きいからアーム成形型孔２２の側壁２２ｂと
パンチ２５の側面２８との厚肉部１７を成形する隙間Ｔ
へ材料が充分に充満されて押出し成形され欠肉のない厚
肉部１７を成形することができるとともに、パンチ２５
の側面２８の形状を所望の形状に選択することで所望に
断面形状の厚肉部１７、すなわち、アーム６を形成する
ことができる。また、トリム加工工程における薄肉部１
８のトリム型による加工は薄肉であることからトリム型
にかかる荷重を小さくすることができるので型寿命を向
上することができる。また、中空軸部１９は前方押出し
加工により成形されるもので、この前方押出し加工によ
り材料は軸成形型孔２３とマンドレル２９とで形成され
る隙間より前方、すなわち軸成形型孔２３側へ流出され
て所定の径ｄの深孔２０を成形しつつ所定の外径Ｄの中
空軸部１９を成形するものであるから、熱間鍛造による
成形品のように深孔加工を行う必要がなく、材料歩留り
を向上することができる。Next, in the above method of manufacturing this yoke member, the preformed product 13 is cold front-back extruded and the arm rough forming portion 16 is formed.
And the hollow shaft portion 19 are integrally molded. The arm rough molding portion 16 is formed in a substantially rectangular tubular shape by a thick portion 17 forming the arm 6 and a thin portion 18 serving as a surplus by the backward extrusion process. The hollow shaft portion 19 is formed by the forward extrusion process, and the outer diameter of the hollow shaft portion 19 is the hollow shaft-equipped yoke 1.
With the outer diameter D of the hollow shaft portion 2, the hole 14 is formed in the hollow portion 19 having the deep hole 20 while maintaining the diameter d1 = d. Therefore, the rough arm forming portion 16 is formed by forming the thin portion 18 by forming a small gap between the side wall 22a of the arm forming die hole 22 and the side surface 27 of the punch 25. The material that constitutes the flash portion and flows by backward extrusion has a large resistance to flow into this gap, so the gap T for forming the thick portion 17 between the side wall 22b of the arm forming die hole 22 and the side surface 28 of the punch 25 is formed.
It is possible to form a thick portion 17 having sufficient thickness and extrusion-molded with no material, and to punch 25
By selecting the desired shape of the side surface 28, the thick portion 17 having a desired sectional shape, that is, the arm 6 can be formed. Also, the thin portion 1 in the trimming process
Since the processing by the trim mold of No. 8 is thin, the load applied to the trim mold can be reduced, so that the mold life can be improved. Further, the hollow shaft portion 19 is formed by front extrusion processing, and by this front extrusion processing, the material flows to the front side of the gap formed by the shaft forming die hole 23 and the mandrel 29, that is, to the shaft forming die hole 23 side. Since the hollow shaft portion 19 having the predetermined outer diameter D is formed while forming the deep hole 20 having the predetermined diameter d, it is not necessary to perform the deep hole processing unlike a molded product by hot forging. The material yield can be improved.
なお、上記実施例においては中空軸部のスプライン孔３
を機械加工により形成して例示したがこれに限定するも
のではなく、例えばマンドレル２９の外周をスプライン
軸状に形成して前方押出し加工で深孔２０成形時にスプ
ライン孔に成形する構成としてもよい。In the above embodiment, the spline hole 3 of the hollow shaft portion is used.
However, the present invention is not limited to this. For example, the outer periphery of the mandrel 29 may be formed into a spline shaft shape, and may be formed into a spline hole when forming the deep hole 20 by forward extrusion.
（発明の効果） さて、本発明に係るユニバーサルジョイント用ヨーク部
材は、深孔あるいはスプライン孔を貫通成形した中空軸
部の一端に同中空軸部の軸心に直交状の基部とこの基部
の四周に厚肉部と薄肉部とにより方形筒形状で前記中空
軸部とは反対方向に延出するアーム粗成形部を一体に備
え、前記アーム粗成形部と中空軸部とは冷間前後方押出
しにより一体に成形したものである。このようにして冷
間鍛造で得られるヨーク部材は予成形品の加工硬化およ
びファイバーフローの改質によりヨーク部材全体の強度
が大幅に向上されて耐用度に優れたヨーク部材１５を得
ることができる。(Effects of the Invention) A yoke member for a universal joint according to the present invention has a hollow shaft portion formed by penetrating a deep hole or a spline hole at one end of the hollow shaft portion, the base portion being orthogonal to the axis of the hollow shaft portion, and the four circumferences of the base portion. Is integrally provided with an arm rough-forming portion that has a rectangular tubular shape and that extends in the direction opposite to the hollow shaft portion due to the thick-walled portion and the thin-walled portion. It is integrally molded by. In this way, the yoke member obtained by cold forging has a significantly improved strength of the entire yoke member due to work hardening of the preformed product and modification of the fiber flow, and the yoke member 15 having excellent durability can be obtained. .
また、このヨーク部材を製造するための本発明に係る方
法は、 (ａ)前記ヨーク部材の全体体積とほぼ等しい体積の素材
を材料取りする材料取り工程と、 (ｂ)前記素材を冷間後方押出しして有底円筒形状に成形
するとともに、同底部を打抜き成形して円筒状の予成形
品に成形する孔成形工程と、 (ｃ)同一軸線上に方形状のアーム成形型孔と円形状の軸
成形型孔とを連通形成したダイスと、前記アーム成形型
孔の一方の対応する側壁と対設して薄肉部を成形する側
面と他方の対応する側壁と対設して厚肉部を成形する側
面とによりなるパンチの先端に前記予成形品の孔に挿入
可能でかつ前記軸成形型孔と対設するマンドレルを設け
て、該パンチにより前記予成形品を冷間前後方押出しし
てアーム粗成形部と中空軸部とを一体成形する冷間前後
方押出し工程と、 からなるものである。したがって、この方法によれば、
アーム粗成形部の成形はアーム成形型孔の側壁とパンチ
の側面との隙間を小さく形成して薄肉部を成形する構成
としたものであるから、この隙間が一種のフラッシュ部
を構成して後方押出しにより流動する材料はこの隙間へ
の流出の抵抗が大きいからアーム成形型孔の側壁とパン
チの側面との厚肉部を成形する隙間へ材料が充分に充満
されて押出し成形され欠肉のない厚肉部を成形すること
ができるとともに、パンチの側面の形状を所望の形状に
選択することで所望に断面形状の厚肉部、すなわち、ア
ームを形成することができる。また、トリム加工工程に
おける薄肉部のトリム型による加工は薄肉であることか
らトリム型にかかる荷重を小さくすることができるので
型寿命を向上することができる。また、中空軸部は前方
押出し加工により成形されるもので、この前方押出し加
工により材料は軸成形型孔とマンドレルとで形成される
隙間より前方、すなわち軸成形型孔２３側へ流出されて
所定の径の深孔を成形しつつ所定の外径の中空軸部を成
形するものであるから、熱間鍛造による成形品のように
深孔加工を行う必要がなく、材料歩留りを向上すること
ができて製品コストの低減を計ることができるので産業
上その資するところ極めて大である。In addition, the method according to the present invention for manufacturing this yoke member includes (a) a material removing step of removing a material having a volume substantially equal to the entire volume of the yoke member, and (b) cold rearwardly removing the material. A hole forming step of extruding and forming into a bottomed cylindrical shape, and punching out and forming the same bottom into a cylindrical preformed product, (c) Square arm forming die hole and circular shape on the same axis Of the arm forming die hole, a side surface of the arm forming die hole facing one of the corresponding side walls to form a thin portion and a side surface of the other side forming a corresponding thick side portion of the arm forming die hole. A mandrel that can be inserted into the hole of the preformed product and is opposed to the shaft forming die hole is provided at the tip of the punch formed by the side surface to be formed, and the preformed product is extruded by the punch before and after the cold. Cold front and rear push that integrally forms the arm rough forming part and the hollow shaft part And then step, is made of. Therefore, according to this method,
Since the arm rough forming part is formed by forming a small gap between the side wall of the arm forming die hole and the side face of the punch to form a thin part, this gap constitutes a kind of flash part and forms a rear part. The material that flows by extrusion has a large resistance to flow into this gap, so the material is sufficiently filled into the gap that forms the thick part between the side wall of the arm forming die hole and the side surface of the punch and extruded, and there is no lack of wall thickness. The thick-walled portion can be formed, and the thick-walled portion having a desired cross-sectional shape, that is, the arm can be formed by selecting the desired shape of the side surface of the punch. Further, since the processing of the thin portion by the trim die in the trimming step is thin, the load applied to the trim die can be reduced, so that the die life can be improved. Further, the hollow shaft portion is formed by front extrusion processing, and by this front extrusion processing, the material flows out to the front side of the gap formed by the shaft forming die hole and the mandrel, that is, on the side of the shaft forming die hole 23, and is predetermined. Since a hollow shaft portion having a predetermined outer diameter is formed while forming a deep hole having a diameter of 10 mm, it is not necessary to perform deep hole processing like a molded product by hot forging, and the material yield can be improved. Since it is possible to reduce the product cost, the industrial contribution is extremely large.
図面は本発明の一実施例を示し、第１図は本発明に係る
完成した中空軸付きヨークの一部破断した正面図、第２
図は本発明の中空軸付きヨークの使用例を示す一部破断
図、第３図は冷間鍛造成形工程図、第４図は素材の斜視
図、第５図(Ａ)は孔成形工程により冷間後方押出しした
素材の断面図、第５図(Ｂ)は同くその底部を打抜きした
予成形品の斜視図、第６図はヨーク部材の斜視図、第７
図(A)(B)はヨーク部材成形の説明図、第８図は第７図
(Ｂ)のII−II線断面図、第９図はトリム加工後のヨーク
部材の斜視図、第１０図は従来の熱間鍛造によるヨーク
の粗成形品の斜視図、第１１図は同じくバリ取り後のヨ
ークの斜視図である。 １…中空軸付きヨーク ２…中空軸部 ３…スプライン孔 12…冷間鍛造用素材 13…予成形品 14…孔 15…ヨーク部材 16…アーム粗成形部 17…厚肉部 18…薄肉部 19…中空軸部 20…深孔 21…ダイス 22…アーム成形型孔 22a,22b…側壁 23…軸成形型孔 25…パンチ 27,28…側面The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view of a completed yoke with a hollow shaft according to the present invention.
The figure is a partially cutaway view showing an example of using the yoke with a hollow shaft according to the present invention, Fig. 3 is a cold forging process step diagram, Fig. 4 is a perspective view of the material, and Fig. 5 (A) is a hole forming process. A cross-sectional view of the cold-extruded material, FIG. 5 (B) is a perspective view of a preformed product having the same bottom punched out, and FIG. 6 is a perspective view of a yoke member.
Figures (A) and (B) are illustrations of forming the yoke member, and Figure 8 is Figure 7.
FIG. 9B is a sectional view taken along line II-II of FIG. 9B, FIG. 9 is a perspective view of the yoke member after trimming, FIG. 10 is a perspective view of a conventional yoke forging product by hot forging, and FIG. It is a perspective view of the yoke after taking. 1 ... Yoke with hollow shaft 2 ... Hollow shaft part 3 ... Spline hole 12 ... Cold forging material 13 ... Preformed product 14 ... Hole 15 ... Yoke member 16 ... Arm rough molding part 17 ... Thick part 18 ... Thin part 19 … Hollow shaft 20… Deep hole 21… Die 22… Arm forming die hole 22a, 22b… Side wall 23… Shaft forming die hole 25… Punch 27, 28… Side
フロントページの続き (56)参考文献 特開 昭53−14157（ＪＰ，Ａ) 特開 昭61−30252（ＪＰ，Ａ) 特開 昭57−160544（ＪＰ，Ａ)Continuation of front page (56) Reference JP-A-53-14157 (JP, A) JP-A-61-30252 (JP, A) JP-A-57-160544 (JP, A)
Claims (2)
中空軸部の一端に同中空軸部の軸心に直交状の基部とこ
の基部の四周に厚肉部と薄肉部とにより方形筒形状で前
記中空軸部とは反対方向に延出するアーム粗成形部を一
体に備え、前記アーム粗成形部と中空軸部とは冷間前後
方押出しにより一体に成形したことを特徴とするユニバ
ーサルジョイント用ヨーク部材。1. A rectangular cylindrical shape having a hollow shaft portion formed by penetrating a deep hole or a spline hole at one end thereof and having a base portion orthogonal to the axis of the hollow shaft portion and a thick wall portion and a thin wall portion on four circumferences of the base portion. A universal joint characterized in that it is integrally provided with an arm rough molding portion extending in a direction opposite to the hollow shaft portion, and the arm rough molding portion and the hollow shaft portion are integrally molded by cold front / back extrusion. Yoke member.
中空軸部の一端に同中空軸部の軸心に直交状の基部とこ
の基部の四周に厚肉部と薄肉部とにより方形筒形状で前
記中空軸部とは反対方向に延出するアーム粗成形部を一
体に備えたヨーク部材の製造方法であって、 (ａ)前記ヨーク部材の全体体積とほぼ等しい体積の素材
を材料取りする材料取り工程と、 (ｂ)前記素材を冷間後方押出しして有底円筒形状に成形
するとともに、同底部を打抜き成形して円筒状の予成形
品に成形する孔成形工程と、 (ｃ)同一軸線上に方形状のアーム成形型孔と円形状の軸
成形型孔とを連通形成したダイスと、前記アーム成形型
孔の一方の対応する側壁と対設して薄肉部を成形する側
面と他方の対応する側壁と対設して厚肉部を成形する側
面とによりなるパンチの先端に前記予成形品の孔に挿入
可能でかつ前記軸成形型孔と対設するマンドレルを設け
て、該パンチにより前記予成形品を冷間前後方押出しし
てアーム粗成形部と中空軸部とを一体成形する冷間前後
方押出し工程と、 からなることを特徴とするユニバーサルジョイント用ヨ
ーク部材の製造方法。2. A rectangular tubular shape comprising a base portion orthogonal to the axis of the hollow shaft portion at one end of the hollow shaft portion formed by penetrating a deep hole or a spline hole, and a thick wall portion and a thin wall portion on the four circumferences of the base portion. A method for manufacturing a yoke member integrally provided with an arm rough molding portion extending in a direction opposite to the hollow shaft portion, comprising: (a) a material for taking a material having a volume substantially equal to the entire volume of the yoke member. And (b) a hole forming step in which the material is cold backward extruded to form a bottomed cylindrical shape, and the bottom is punched to form a cylindrical preformed product, and (c) the same A die in which a square arm forming die hole and a circular shaft forming die hole are formed to communicate with each other on an axis, and a side surface and a other side that are opposed to one side wall of the arm forming die hole to form a thin portion. Punches that are formed by forming a thick portion by facing the corresponding side wall of the punch A mandrel, which can be inserted into the hole of the preformed product and faces the shaft forming die hole, is provided at the tip, and the preformed product is extruded by the punch in the cold front and rear directions to form a rough arm portion and a hollow shaft portion. A method of manufacturing a yoke member for a universal joint, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4400885A JPH068652B2 (en) | 1985-03-05 | 1985-03-05 | Yoke member for universal joint and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4400885A JPH068652B2 (en) | 1985-03-05 | 1985-03-05 | Yoke member for universal joint and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61201926A JPS61201926A (en) | 1986-09-06 |
| JPH068652B2 true JPH068652B2 (en) | 1994-02-02 |
Family
ID=12679668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4400885A Expired - Lifetime JPH068652B2 (en) | 1985-03-05 | 1985-03-05 | Yoke member for universal joint and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH068652B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008091134A1 (en) * | 2007-01-26 | 2008-07-31 | Jin Beom Ko | Yoke manufacturing method |
| KR101255809B1 (en) * | 2012-12-03 | 2013-04-17 | 고진범 | Yoke manufacturing method |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4022692C2 (en) * | 1990-07-17 | 1996-09-19 | Gkn Automotive Ag | Process for producing a drive shaft with integrally molded joint components and drive shaft produced thereafter |
| JP3719739B2 (en) * | 1995-06-29 | 2005-11-24 | 日本精工株式会社 | Method for manufacturing elastic universal joint yoke |
| JP4130294B2 (en) * | 2000-07-18 | 2008-08-06 | 日本精工株式会社 | Elastic shaft coupling for steering |
| US20050028341A1 (en) * | 2003-07-01 | 2005-02-10 | Durand Robert D. | Method of manufacturing a combined driveshaft tube and yoke assembly |
| US7181846B2 (en) * | 2004-07-08 | 2007-02-27 | Torque-Traction Technologies, Inc. | Method of manufacturing a combined driveshaft tube and yoke assembly |
| KR100655940B1 (en) | 2006-02-22 | 2006-12-11 | 주식회사 코우 | Yoke manufacturing metho |
| JP5181863B2 (en) * | 2008-06-20 | 2013-04-10 | 日本精工株式会社 | Output shaft structure of electric power steering device |
| JP5549292B2 (en) * | 2010-03-15 | 2014-07-16 | 日本精工株式会社 | Method for manufacturing universal joint yoke |
| JP5376260B2 (en) * | 2011-01-31 | 2013-12-25 | 株式会社ミナミダ | Striker manufacturing method |
| US8590594B2 (en) * | 2011-12-22 | 2013-11-26 | Panther Machine, Inc. | Universal joint and method for manufacturing same |
| KR101685496B1 (en) * | 2016-05-09 | 2016-12-13 | (주)성진포머 | Apparatus for manufacturing tube yoke |
-
1985
- 1985-03-05 JP JP4400885A patent/JPH068652B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008091134A1 (en) * | 2007-01-26 | 2008-07-31 | Jin Beom Ko | Yoke manufacturing method |
| KR101255809B1 (en) * | 2012-12-03 | 2013-04-17 | 고진범 | Yoke manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61201926A (en) | 1986-09-06 |
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