JPS61149616A - Outer ring of universal joint with cross groove - Google Patents
Outer ring of universal joint with cross grooveInfo
- Publication number
- JPS61149616A JPS61149616A JP27040484A JP27040484A JPS61149616A JP S61149616 A JPS61149616 A JP S61149616A JP 27040484 A JP27040484 A JP 27040484A JP 27040484 A JP27040484 A JP 27040484A JP S61149616 A JPS61149616 A JP S61149616A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- cross groove
- outer ring
- cross
- 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.)
- Pending
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
- F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
- F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
- F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
- F16D3/226—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts the groove centre-lines in each coupling part lying on a cylinder co-axial with the respective coupling part
-
- 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
-
- 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
-
- 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
- F16D2250/00—Manufacturing; Assembly
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明はクロス溝を有する自在継手の外輪の形状に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to the shape of the outer ring of a universal joint having cross grooves.
第４図に示すようにクロス溝１を有する自在継手２は、
一方の駆動軸から伝えられる回転力が他方の被駆動軸に
一定の角速度で伝えられる等速ジヨイントの機能と、軸
方向の摺動をゆるすスリーブジヨイントの機能を合わせ
て有するものである。As shown in FIG. 4, the universal joint 2 having the cross groove 1 is
It has both the function of a constant velocity joint, which transmits the rotational force from one drive shaft to the other driven shaft at a constant angular velocity, and the function of a sleeve joint, which allows sliding in the axial direction.
そして、一方の軸に設けられた内輪３が他方の軸に設け
られた外輪４内に収納されており、これら内輪３と外輪
４の間にボール５が複数周設されている。このボール５
は外輪４０円筒部４′内面く形成されるクロス＃ｌに嵌
合している。このクロス溝１は外輪４の軸方向に対しク
ロスした方向に形成されている。これＫより、このボー
ル５は前記二つの軸が交差するときの交差角の二等分線
上に常に存在することになる。しかもボール５はクロＸ
溝ＩＫ沿って一定量移動することができ、二つの軸は軸
方向に摺動することができるものである。An inner ring 3 provided on one shaft is housed in an outer ring 4 provided on the other shaft, and a plurality of balls 5 are provided around the inner ring 3 and outer ring 4. this ball 5
is fitted into the cross #l formed on the inner surface of the cylindrical portion 4' of the outer ring 40. This cross groove 1 is formed in a direction crossing the axial direction of the outer ring 4. From this K, this ball 5 always exists on the bisector of the intersection angle when the two axes intersect. Moreover, ball 5 is black X
It can move a certain amount along the groove IK, and the two shafts can slide in the axial direction.
このようなりロス溝を有する自在継手の外輪の製造方法
は、クロス溝を一溝または二連づつ形成するブローチ加
工等の切削加工や、研削加工によって行うものであった
。あるいはさらに生産性を向上するため成形型を用いた
遡性加工によるものが存在する（特開昭５８−５０１４
７、特開昭５７−９１８３７、特開昭５２−３９５５、
特開昭５１−１２４７６１．９公昭４９−３２４８２、
特公昭４８−４８０９７゜
〔問題点〕
しかしながらいずれの製造方法においても、第５図に示
すようにクロス溝１の縁辺６は角ばって内稜部を形成し
てしまう。このため回転力が伝達されてボール５と内稜
部が接触する゛と過大な接触応力が発生し、前記内稜部
が欠けたシボール５に傷がついたりするものであった。The method of manufacturing the outer ring of a universal joint having such a loss groove is performed by cutting such as broaching or grinding to form one or two cross grooves. Alternatively, in order to further improve productivity, there is a method using retroactive processing using a mold (Japanese Patent Application Laid-Open No. 58-5014
7, JP-A-57-91837, JP-A-52-3955,
Japanese Patent Publication No. 51-124761.9 Publication No. 49-32482,
Japanese Patent Publication No. 48-48097 [Problems] However, in either manufacturing method, the edges 6 of the cross grooves 1 are angular and form internal ridges, as shown in FIG. For this reason, when the rotational force is transmitted and the ball 5 comes into contact with the inner ridge, excessive contact stress is generated, and the ball 5 with the inner ridge chipped is damaged.
あるいはまた内稜部においてボールとの間に過大な摩擦
力が発生しボールが内稜部に乗シあけてしまう事故も発
生しやすいものであった。本発明はこれらの問題点を解
決することのできるクロス溝を有する自在継手の外輪を
提供することを目的とする。Alternatively, an excessive frictional force is generated between the ball and the ball at the inner ridge, and an accident is likely to occur in which the ball rides on the inner ridge. An object of the present invention is to provide an outer ring of a universal joint having cross grooves that can solve these problems.
本発明は、成形型を用いた遡性加工によりクロス溝を形
成し、この成形型はクロス溝の縁辺が曲面となるものを
用いるものである。、切削加工や研磨加工等の機械加工
によっては、削り取られるべき内稜部が三次元曲線とな
っているため、加工が困難であり外輪の製作費が冒とし
てしまうが、本発明によればこのような困難がなく安価
に外輪を製作することができる。In the present invention, cross grooves are formed by retroprocessing using a mold, and this mold uses a mold in which the edges of the cross grooves are curved surfaces. Depending on the machining process, such as cutting or polishing, the inner ridge to be removed is a three-dimensional curve, making it difficult to process and increasing the production cost of the outer ring. However, according to the present invention, this The outer ring can be manufactured at low cost without such difficulties.
本発明の一実施例を第１図ないし第３図において説明す
る。これらの図で説明する外輪の製造装置は出願人がす
でに行った出願（特願昭５９−７８０９７３に記載され
る製造装置とほぼ同一である。この装置は固定下型１１
に支持されたマンドレルポンチ１２に、外輪４と軸部４
″とが一対になっている素形材１３を被せ、可動上型１
４に支持された押え型１５にょシ上方から押圧しクロス
溝１の形成を行うものである。以下、さらに詳しく説明
する。An embodiment of the present invention will be explained with reference to FIGS. 1 to 3. FIG. The outer ring manufacturing apparatus illustrated in these figures is almost the same as the manufacturing apparatus described in the applicant's previously filed patent application (Japanese Patent Application No. 59-780973).
The outer ring 4 and the shaft portion 4 are attached to the mandrel punch 12 supported by the
The movable upper mold 1 is covered with a molded material 13 having a pair of
The cross groove 1 is formed by pressing the presser die 15 supported by the presser die 4 from above. This will be explained in more detail below.
固定下型１１の中央には略円柱形のマンドレルポンチ１
２が支持されている。このマンドレルポンチ１２は遡性
加工される素形材１３を被せるためめものであシ、外周
には６本のクロス溝型１６が軸方向Ｋかっ等配に配設さ
れて伝る。またクロス溝型１６は固定下型１１に取り付
けられたシリンダ１７と接続されている。そして図示し
ない油圧ユニットによシシリンダ１７が駆動されると、
クロス溝型１６はマンドレルポンチ１２の嵌合溝に沿っ
て昇降するよう罠なっている。A substantially cylindrical mandrel punch 1 is placed in the center of the fixed lower die 11.
2 is supported. This mandrel punch 12 is a stopper for covering the material 13 to be processed retroactively, and six cross grooves 16 are arranged on the outer periphery at equal intervals in the axial direction. Further, the cross groove mold 16 is connected to a cylinder 17 attached to the fixed lower mold 11. When the cylinder 17 is driven by a hydraulic unit (not shown),
The cross groove type 16 is a trap that moves up and down along the fitting groove of the mandrel punch 12.
このクロス溝型１６の断面形状は第３図、あるいは第３
図の要部拡大図である第１図に示すようＫおのおのがク
ロス溝の縁辺を曲面とする形状となっている。すをわち
従来はクロス溝型１６のマンドレルポンチ１２に対する
配設箇所において。The cross-sectional shape of this cross groove type 16 is shown in FIG.
As shown in FIG. 1, which is an enlarged view of the main part of the figure, each of the cross grooves has a shape in which the edges of the cross grooves are curved surfaces. Specifically, in the conventional method, the cross-groove type 16 is disposed at a location relative to the mandrel punch 12.
両者の表面は直角に交わり、したがって成形加工後は前
記問題点で述べたように内稜部を形成してしまうもので
あった。しかしながらこの実施例゛のようなりロス溝型
１６の断面形状とすることによって、この内稜部は始め
から存在しないものとなる。The two surfaces intersect at right angles, and therefore, after the molding process, an internal ridge is formed as described in the above-mentioned problem. However, by forming the cross-sectional shape of the loss groove type 16 as in this embodiment, this inner ridge portion does not exist from the beginning.
さらに装置の説明を続けると、マンドレルポンチ１２の
頂部には略きのこ状のノックアウト１８が嵌挿されてい
る。嵌挿されたきのこ状の中心軸１９は固定下型１１に
取シ付けられたシリンダ２゜と接続されている。図示し
ない油圧ユニットによシ、このシリンダ２０が駆動され
ると、ノックアウト１８は軸方向に昇降する。一方、可
動上型１４忙は押え型１５が支持されている。この支持
は。Continuing the explanation of the device further, a substantially mushroom-shaped knockout 18 is fitted into the top of the mandrel punch 12. The inserted mushroom-shaped central shaft 19 is connected to a cylinder 2° attached to the fixed lower die 11. When this cylinder 20 is driven by a hydraulic unit (not shown), the knockout 18 moves up and down in the axial direction. On the other hand, a presser die 15 is supported on the movable upper die 14. This support.
可動上型１４の中心上下方向に形成される押え型室２２
に、押え型１５の後方がパツキン２３を介して挿入され
ることによりなされる。押え型室２２内にはプレス油が
ｆＲｆｃされており押え型１５の上方においてこのプレ
ス油に圧力が加えられることＫより成形加工がなされる
。なお押え型１５の下端内部には素形材１３の細部４″
に対応する凹部２４が形成されている。また押え型１５
においてこの凹部２４の上方には払いバー２５がバネ２
６によって下方向く押圧されている。A holding mold chamber 22 formed in the vertical direction of the center of the movable upper mold 14
This is done by inserting the rear part of the presser mold 15 through the packing 23. Press oil is contained in the press mold chamber 22, and the press oil is pressurized above the press mold 15, thereby forming the mold. In addition, inside the lower end of the presser die 15, there is a detail 4'' of the material 13.
A recessed portion 24 corresponding to this is formed. Also presser mold 15
Above this concave portion 24, a dispensing bar 25 is attached to the spring 2.
6 is pressed downward.
次にマンドレルポンチ１２の周囲近傍には、このｖント
レルホンチ１２を固定するためのマンドレルポンチ押え
型２．７が存在し、さらにその周囲にはスライドプレー
ト２８が設けられている。このマンドレル押え型２７と
スライドプレート２８は同一高さの上面を有している。Next, near the periphery of the mandrel punch 12, there is a mandrel punch holding die 2.7 for fixing the V-trel punch 12, and a slide plate 28 is further provided around the mandrel punch holding die 2.7. The mandrel presser mold 27 and the slide plate 28 have upper surfaces of the same height.
この上面において、第３図に示すように１素形材１３の
周囲に接して６箇の成形型２９が配置され、さらにその
周囲には受動型３０が前記成形型２９に固定して配置さ
れている。この受動型２９はロッド３１を介して固定下
型１１に設けられる図示しないバネまたはシリンダによ
シ外方へ引き寄せられている。On this upper surface, as shown in FIG. 3, six molds 29 are arranged in contact with the periphery of one raw material 13, and furthermore, a passive mold 30 is arranged around the six molds 29 fixed to the molds 29. ing. This passive mold 29 is drawn outward via a rod 31 by a spring or cylinder (not shown) provided on the fixed lower mold 11.
同時に、この受動型３０の背面にはテーパー面３２が形
成され、前記可動上型１４に設けられる置型３３によシ
可動上型１４の下降に伴なってテーパー面３２を押圧さ
れて中心ＫＷせられ素形材１３を押圧することになる。At the same time, a tapered surface 32 is formed on the back surface of the passive mold 30, and the tapered surface 32 is pressed by the stationary mold 33 provided on the movable upper mold 14 as the movable upper mold 14 descends, and the center KW is pressed. Then, the material 13 is pressed.
以下に本実施例の作用について説明する。マンドレルポ
ンチ１２の上に素形材１３を被せ、可動上型１４を下降
させる。素形材１３の外輪部４′の周囲は、置型３３に
よシ押圧される受動型３０のテーパー面３２の働きによ
って、成形型２９に拘束される。素形材１３の上方は押
え歴１５により押圧される。このときの押え型１５の押
圧力は、押え型室２２内の油圧が一定に調整されること
により、一定となる。素形材１３の外輪部４′内面はク
ロス溝型１６により押圧されクロス溝１が形成される。The operation of this embodiment will be explained below. The material 13 is placed on the mandrel punch 12, and the movable upper mold 14 is lowered. The periphery of the outer ring portion 4' of the material 13 is restrained by the mold 29 by the tapered surface 32 of the passive mold 30 which is pressed by the stationary mold 33. The upper part of the raw material 13 is pressed by a presser foot 15. The pressing force of the presser mold 15 at this time becomes constant because the oil pressure in the presser mold chamber 22 is adjusted to a constant value. The inner surface of the outer ring portion 4' of the raw material 13 is pressed by the cross groove die 16 to form the cross groove 1.
このとき第１図に示すようにクロス溝型１６の断面形状
が、クロス溝の縁辺７を曲面とするような形状となって
いる。この丸め外輪の成形終了後機械的工作によシフロ
ス溝の縁辺７０角稜部を除く必要が表い。At this time, as shown in FIG. 1, the cross-sectional shape of the cross groove mold 16 is such that the edge 7 of the cross groove is a curved surface. After the molding of this rounded outer ring is completed, it is necessary to remove the 70-angular ridge of the edge of the sifting groove by mechanical work.
本発明のクロス溝を有する自在継手の外輪によれば、ク
ロス溝の縁辺に内稜部が存在しないので、ボールととの
内稜との接触がなく接触応力過大によシ角綾部が欠けた
シボールに傷ができたりすることがなく、また内稜部に
ボールが乗りあげる事故も防止できる。さらには成形加
工によってクロス溝の縁辺を曲面とするため、機械加工
のようｋ＝次元曲線の内稜部を削するという困難を回避
できる。さらには切削加工や研削加工のような機械加工
を必要としないため、加工［ｇ！する時間が短かく、外
輪の製造費も安価となる。According to the outer ring of the universal joint having a cross groove according to the present invention, since there is no inner edge on the edge of the cross groove, there is no contact between the inner edge of the ball and the ball, and the contact stress is excessive and the corner edge is chipped. This prevents the ball from being scratched, and also prevents the ball from riding on the inner ridge. Furthermore, since the edges of the cross grooves are made into curved surfaces by the molding process, it is possible to avoid the difficulty of cutting the inner edge of the k=dimensional curve as in machining. Furthermore, since machining such as cutting or grinding is not required, processing [g! The time required to do this is short, and the manufacturing cost of the outer ring is also low.
第４図はクロス溝蚕有する自在継手の外輪の縦断面図、
第５図は第４図の外輪の横断面図、第２図は本発明の外
輪製造に用いられる製造装置の縦断面図、第３図は第２
図の■−ｍ断面図、第１図は第３図の中心部拡大図であ
る。
１・・・クロス溝、２・・・自在継手、３・・・内輪、
４・・・外輪、５・・・ボール、６・・・縁辺、１１・
・・固定下型、１２・・・マンドレルポンチ、１３・・
・素形材、１４・・・可動上型、１５・・・押え型、１
６・・・クロス溝型。
１７°°°シリンダ、１８・・・ノックアウト、１９・
・・中心軸、２０・・・シリンダ、２２・・・押え型室
、２３・・・パツキン、２４・・・凹ｍ、２５・・・払
いバー％２６・・・バネ、２７・・・マンドレルポンチ
押え型、ｚｓ・・・スライドプレート、２９・・・成形
型、３０・・・受動型、３１・・・ロッド、３２・・・
テーパ面、３３・・・置型。Figure 4 is a longitudinal cross-sectional view of the outer ring of a universal joint with cross grooves;
5 is a cross-sectional view of the outer ring shown in FIG. 4, FIG. 2 is a longitudinal sectional view of the manufacturing apparatus used for manufacturing the outer ring of the present invention, and FIG.
FIG. 1 is an enlarged view of the central part of FIG. 3. 1...Cross groove, 2...Universal joint, 3...Inner ring,
4...Outer ring, 5...Ball, 6...Edge, 11.
...Fixed lower mold, 12...Mandrel punch, 13...
・Form material, 14... Movable upper mold, 15... Presser mold, 1
6...Cross groove type. 17°°° cylinder, 18...knockout, 19.
... Central axis, 20 ... Cylinder, 22 ... Presser mold chamber, 23 ... Packing, 24 ... Concave m, 25 ... Brushing bar % 26 ... Spring, 27 ... Mandrel Punch holding die, zs...slide plate, 29...molding die, 30...passive type, 31...rod, 32...
Tapered surface, 33...standing type.
Claims (1)
るクロス溝をクロス溝の縁辺が曲面となる成形型を用い
た遡性加工によつて形成したことを特徴とするクロス溝
を有する自在継手の外輪。(1) The cross groove formed on the inner surface of the cylindrical portion of the outer ring constituting the universal joint is formed by retroactive machining using a mold in which the edges of the cross groove are curved surfaces. Outer ring of a universal joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27040484A JPS61149616A (en) | 1984-12-21 | 1984-12-21 | Outer ring of universal joint with cross groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27040484A JPS61149616A (en) | 1984-12-21 | 1984-12-21 | Outer ring of universal joint with cross groove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61149616A true JPS61149616A (en) | 1986-07-08 |
Family
ID=17485787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27040484A Pending JPS61149616A (en) | 1984-12-21 | 1984-12-21 | Outer ring of universal joint with cross groove |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61149616A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2792230A1 (en) * | 1999-04-16 | 2000-10-20 | Gkn Automotive Ag | Method and appliance for finishing non-cutting shaping of homocinetic joints involve inner cavity of outer part, with t racks, calibrating pin between jaws |
| JP2008260435A (en) * | 2007-04-12 | 2008-10-30 | Ntn Corp | Axle module for rear wheel |
-
1984
- 1984-12-21 JP JP27040484A patent/JPS61149616A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2792230A1 (en) * | 1999-04-16 | 2000-10-20 | Gkn Automotive Ag | Method and appliance for finishing non-cutting shaping of homocinetic joints involve inner cavity of outer part, with t racks, calibrating pin between jaws |
| WO2000063568A3 (en) * | 1999-04-16 | 2001-01-11 | Gkn Automotive Ag | Method and device for completing outer joint elements that are formed without cutting |
| US6398886B1 (en) | 1999-04-16 | 2002-06-04 | Gkn Automotive Ag | Method and device for completing outer joint elements that are formed without cutting |
| JP2008260435A (en) * | 2007-04-12 | 2008-10-30 | Ntn Corp | Axle module for rear wheel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS5852733B2 (en) | Outer lace processing method and equipment | |
| JPS5944138B2 (en) | Method and device for ironing the outer ring of a universal joint | |
| JPS61149616A (en) | Outer ring of universal joint with cross groove | |
| JPS641219B2 (en) | ||
| CN216780054U (en) | Automatic mould for internal hard and external soft rubber movable flat wheel support | |
| EP0022872B1 (en) | Method of manufacturing inner race of synchronous universal joint | |
| JPH0215832A (en) | Manufacture of element with grooved trunnion and method and tool for forming groove to trunnion | |
| JPS6124092B2 (en) | ||
| JPH0465503B2 (en) | ||
| JPH0623573B2 (en) | Outer ring of universal joint and its manufacturing method | |
| JPS61160630A (en) | Outer ring of universal joint with cross groove | |
| CN203477114U (en) | High-performance tripod uniform-velocity universal joint | |
| CN103410878A (en) | High-performance tripod constant velocity universal joint | |
| KR100266135B1 (en) | An apparatus for manufacturing gears for use in automobile transmission system by forging | |
| EP0193312A3 (en) | Method and apparatus for single step formation of spherical retainer | |
| CN210679843U (en) | Double-curvature flap compression molding die | |
| JPS6233036A (en) | Manufacture of equal speed universal joint inner ring | |
| JP3515514B2 (en) | Manufacturing method of inner ring of constant velocity joint | |
| JP2581173B2 (en) | Cold forging method of internal spline with tooth chamfer | |
| JPS60102247A (en) | Segment forging device of sprocket rim | |
| JPS6227306Y2 (en) | ||
| JPH0357296Y2 (en) | ||
| CN114453483A (en) | Automatic mould for internal hard and external soft rubber movable flat wheel support | |
| JPH038892U (en) | ||
| JPH0718453Y2 (en) | Inner ring forging die for constant velocity joints |