JPH0349648B2 - - Google Patents
Info
- Publication number
- JPH0349648B2 JPH0349648B2 JP12601284A JP12601284A JPH0349648B2 JP H0349648 B2 JPH0349648 B2 JP H0349648B2 JP 12601284 A JP12601284 A JP 12601284A JP 12601284 A JP12601284 A JP 12601284A JP H0349648 B2 JPH0349648 B2 JP H0349648B2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- balls
- guide
- roller
- guide pin
- 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
Links
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims 2
- 238000003754 machining Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、軸とスリーブを有し、スリーブの軸
受内径面に動圧発生溝を有する溝付きの流体軸受
の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a grooved hydrodynamic bearing having a shaft and a sleeve, and having dynamic pressure generating grooves on the bearing inner diameter surface of the sleeve.
従来例の構成とその問題点
従来溝付きの流体軸受とは、第１図に示すよう
に軸１がスリーブ２の内径に回転自在に挿入さ
れ、スリーブの内径には動圧発生溝２Ａが設けら
れ、また軸とスリーブの協働面には潤滑剤が注油
されており、軸１またはスリーブ２のいずれか一
方が回転することにより動圧発生溝２Ａのポンピ
ング作用で圧力を発生するものである。比較的軟
かい金属材料からなるスリーブ２にこの種の軸受
の動圧発生溝２Ａを加工する方法としては硬質な
ボールを用いて塑性加工する方法があるが、従来
その具体的製造方法として第２図に示す方法があ
る。図のように硬質な回転ピン３をスリーブ２の
穴２Ｂと同軸上に回転自在に設け、このスリーブ
２と回転ピン３の間にはガイドパイプ５を同軸か
つ回転自在に設けこのガイドパイプ５には中心軸
の回りに対称的に配置された複数個のガイド穴５
Ａを有し、そこには硬質なボール４Ａ，４Ｂが転
動自在にはめ合わされている。Structure of conventional example and its problems As shown in Fig. 1, a conventional grooved hydrodynamic bearing has a shaft 1 rotatably inserted into the inner diameter of a sleeve 2, and a dynamic pressure generating groove 2A is provided in the inner diameter of the sleeve. The cooperating surfaces of the shaft and the sleeve are lubricated with lubricant, and when either the shaft 1 or the sleeve 2 rotates, pressure is generated by the pumping action of the dynamic pressure generating groove 2A. . As a method of machining the dynamic pressure generating grooves 2A of this type of bearing into the sleeve 2 made of a relatively soft metal material, there is a method of plastic working using hard balls. There is a method shown in the figure. As shown in the figure, a hard rotating pin 3 is provided coaxially and rotatably with the hole 2B of the sleeve 2, and a guide pipe 5 is provided coaxially and freely rotatably between the sleeve 2 and the rotating pin 3. is a plurality of guide holes 5 arranged symmetrically around the central axis.
A, into which hard balls 4A and 4B are fitted in a freely rolling manner.
このときスリーブ２に対して回転ピン３にWP
の回転速度とVPの送り速度を与えると共にこの
回転により回転ピン３とスリーブ２Ｂの間で転動
するボール４Ａ，４Ｂにガイドパイプ５が追従す
るかのようにガイドパイプ５にWKの回転速度と
VKの送り速度を与えてボール４Ａ，４Ｂにより
スリーブ２に塑性加工を施すものであつた。 At this time, W P is applied to the rotating pin 3 with respect to the sleeve 2.
This rotation causes the guide pipe 5 to rotate by W K as if it were to follow the balls 4A and 4B rolling between the rotating pin 3 and the sleeve 2B. speed and
The sleeve 2 was plastically worked by the balls 4A and 4B at a feed rate of VK .
ところが従来のこの製造方法においては回転ピ
ン３とガイドパイプ５にそれぞれ別の回転速度
WP，WKを与えねばならないので製造設備が複雑
になること、また回転ピン３はテーパがなくスト
レートであることが望ましいが、どうしても部分
的に２〜３ミクロンメータの直径のバラツキがで
るものであり、このとき回転ピン３とガイドパイ
プ５の送り速度VPとVKに少しのズレが生じたと
きにボール４Ａ，４Ｂが接する部分での回転ピン
３の直径が変化し、わずかにボール４Ａ，４Ｂが
ガイド穴５Ａ，５Ｂの中で出入りし、加工する動
圧発生溝２Ａの深さに数ミクロンメータのバラツ
キが生じることがあつた。このバラツキは軸受の
回転性能を損うのでとくに大きな欠点になるもの
であつた。 However, in this conventional manufacturing method, the rotating pin 3 and the guide pipe 5 have different rotational speeds.
The manufacturing equipment becomes complicated because W P and W K must be given, and although it is desirable that the rotating pin 3 be straight without a taper, it is inevitable that the diameter will vary by 2 to 3 micrometers in some parts. At this time, when there is a slight deviation between the feed speeds V P and V K of the rotating pin 3 and the guide pipe 5, the diameter of the rotating pin 3 at the part where the balls 4A and 4B touch changes, and the ball slightly 4A and 4B move in and out of the guide holes 5A and 5B, and the depth of the dynamic pressure generating groove 2A to be machined sometimes varies by several micrometers. This variation was a particularly large drawback since it impairs the rotational performance of the bearing.
発明の目的
本発明は上記従来の欠点を解消するものであり
動圧発生溝の製造方法に係わり、その深さのバラ
ツキを少なく、高精度に加工でき、かつ製造設備
を簡単にするものである。Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and relates to a method for manufacturing dynamic pressure generating grooves, which reduces variation in depth, enables highly accurate processing, and simplifies manufacturing equipment. .
発明の構成
本発明は、中心軸に対して対称的でかつ放射線
上に配置された複数個のガイド穴と、このガイド
穴に連結する中心穴を有するガイドピンの前記ガ
イド穴に硬質な複数個のボールを有し、中心穴に
は硬質でかつ、前記ボールに連動して回転自在で
かつ、軸方向の動きを規制されたローラーを有
し、流体軸受のスリーブ内径よりも前記ローラー
の直径とボール２個分の直径の合計をわずかに大
きく組合わせ、ガイド軸に回転および送り速度を
与えることにより前記スリーブ内径に動圧発生溝
を高精度にかつ容易に形成することができるとい
う効果を有する。Structure of the Invention The present invention provides a guide pin having a plurality of guide holes arranged radially and symmetrically with respect to a central axis, and a center hole connected to the guide holes. It has a hard roller in the center hole, which is rotatable in conjunction with the ball and whose movement in the axial direction is restricted, and the diameter of the roller is smaller than the inner diameter of the sleeve of the hydrodynamic bearing. By combining the sum of the diameters of the two balls to be slightly larger and giving rotation and feed speed to the guide shaft, it is possible to easily form a dynamic pressure generating groove on the inner diameter of the sleeve with high precision. .
実施例の説明
以下に本発明実施例を第３〜４図にもとづいて
説明する。第３図は本発明第１の実施例の図であ
る。ガイドピン６には中心軸に対称でかつ放射線
状に配置された複数個のガイド穴６Ａ，６Ｂを有
し、また中心には穴６Ｃを有する。このガイド穴
６Ａ，６Ｂには硬質なボール７Ａ，７Ｂが回転自
在に挿入され、また穴６Ｃにはボール７Ａ，７Ｂ
と連動して回転自在でかつ硬質なローラー８が挿
入されている。穴６Ｃにはさらにピン９が固定さ
れローラー８はこのピン９により軸方向の動きを
規制される。またスリーブ２の内径よりもローラ
ーの直径とボール７Ａ，７Ｂの２個分の直径の合
計はわずかに大きくなるようローラー８の直径は
選定されている。この状態でスリーブ２の穴２Ｂ
の中でガイドピン６に回転速度Ｗと共に送り速度
Ｖを与えると動圧発生溝２Ａはボール７Ａ，７Ｂ
による塑性加工により形成される。第１図に示す
ようなヘリングボーン型の動圧発生溝２Ａを加工
するにあたつては、第３図においてスリーブ２の
略中央までボール７Ａ，７Ｂが進んだときにガイ
ドピン６の送り速度Ｖは変えずに回転速度Ｗを逆
方向に切替えることにより形成することができ
る。DESCRIPTION OF EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 3 and 4. FIG. 3 is a diagram of the first embodiment of the present invention. The guide pin 6 has a plurality of guide holes 6A, 6B arranged radially and symmetrically about the central axis, and has a hole 6C in the center. Hard balls 7A, 7B are rotatably inserted into the guide holes 6A, 6B, and balls 7A, 7B are inserted into the hole 6C.
A rotatable and hard roller 8 is inserted in conjunction with the roller. A pin 9 is further fixed in the hole 6C, and the movement of the roller 8 in the axial direction is restricted by this pin 9. Further, the diameter of the roller 8 is selected so that the sum of the diameter of the roller and the diameters of the two balls 7A and 7B is slightly larger than the inner diameter of the sleeve 2. In this state, hole 2B of sleeve 2
When the rotation speed W and feed speed V are applied to the guide pin 6 in the
Formed by plastic working. When machining the herringbone type dynamic pressure generating groove 2A as shown in FIG. 1, the feed rate of the guide pin 6 is V can be formed by switching the rotational speed W in the opposite direction without changing it.
このように本発明においては動圧発生溝２Ａを
形成するにあたりガイドピン６だけ送りおよび回
転速度を与えればよいので製造設備が簡単にな
る。 As described above, in the present invention, when forming the dynamic pressure generating grooves 2A, it is only necessary to feed and rotate the guide pin 6, which simplifies the manufacturing equipment.
またローラー８はピン９により軸方向のガタを
規制されているため、従来のようにボール７Ａ，
７Ｂの部分で直径が変化することがないため動圧
発生溝の深さにバラツキが生じない。とくにこの
溝の深さは10ミクロンメータ程度と浅いため、２
ミクロンメータ程度の深さのバラツキが流体軸受
の性能、信頼性に大きな影響を与えるのでとくに
これは重要な課題であつた。 Moreover, since the roller 8 is prevented from playing in the axial direction by the pin 9, the balls 7A and
Since the diameter does not change at the portion 7B, there is no variation in the depth of the dynamic pressure generating groove. In particular, the depth of this groove is shallow, about 10 micrometers, so 2
This was a particularly important issue because variations in depth on the order of micrometers have a large impact on the performance and reliability of hydrodynamic bearings.
第４図に第２の実施例を示す。１０はガイドピ
ン、１０Ａ，１０Ｂはガイド穴、１０Ｃは中心穴
１１Ａ，１１Ｂは第１のボール、１２はローラ
ー、１４はピンであり、これらは第１の実施例と
同じである。第２の実施例においては中心穴１０
Ｃの中においてローラー１２の側面に当接して第
２のボール１３Ａ，１３Ｂが挿入されている。こ
の第２のボール１３Ａ，１３Ｂによつてローラー
１２が第１のボール１１Ａ，１１Ｂと共に非常に
軽く回転することができる。もしこのローラー１
２の回転がスムーズでないときにはスリーブ２に
接する第１のボール１１Ａ，１１Ｂの転動がスム
ーズでなくなり加工される動圧発生溝の表面に部
分的なバリやムシレが残ることがあるが、本実施
例の製造方法によれば動圧発生溝が高精度かつ美
しい表面状態に仕上がり、バリやムシレは全く生
じない。 FIG. 4 shows a second embodiment. 10 is a guide pin, 10A and 10B are guide holes, 10C is a center hole 11A and 11B are first balls, 12 is a roller, and 14 is a pin, which are the same as in the first embodiment. In the second embodiment, the central hole 10
Second balls 13A and 13B are inserted in C so as to come into contact with the side surface of the roller 12. The second balls 13A, 13B allow the roller 12 to rotate very lightly together with the first balls 11A, 11B. If this roller 1
If the rotation of the sleeve 2 is not smooth, the rolling of the first balls 11A and 11B in contact with the sleeve 2 may not be smooth, and partial burrs or cracks may remain on the surface of the hydrodynamic groove to be machined. According to the example manufacturing method, the dynamic pressure generating grooves are finished with high precision and a beautiful surface condition, and no burrs or cracks occur at all.
発明の効果
このように本発明はガイドピンに固定ピンと硬
質なボールを取付け、スリーブ内で回転および送
り速度を与えることにより溝深さのバラツキなく
高精度かつ簡単に動圧発生溝を加工するという特
徴を有している。Effects of the Invention As described above, the present invention attaches a fixed pin and a hard ball to a guide pin, and rotates and feeds the ball within the sleeve, thereby easily machining a dynamic pressure generating groove with high accuracy and without variation in groove depth. It has characteristics.
第１図は溝付き流体軸受の断面図、第２図は従
来のスリーブ内径に溝を形成する製造装置の断面
図、第３図は本発明の第一実施例のスリーブ内径
に溝を形成する製造装置の断面図、第４図は本発
明の第２の実施例の同製造装置の断面図である。
１……軸、２……スリーブ、２Ａ……動圧発生
溝、６，１０……ガイドピン、６Ａ，６Ｂ，１０
Ａ，１０Ｂ……ガイド穴、６Ｃ，１０Ｃ……中心
穴、７Ａ，７Ｂ，１１Ａ，１１Ｂ……ボール、
８，１２……ローラー。
Fig. 1 is a cross-sectional view of a grooved hydrodynamic bearing, Fig. 2 is a cross-sectional view of a conventional manufacturing device for forming grooves on the inner diameter of a sleeve, and Fig. 3 is a cross-sectional view of a groove formed on the inner diameter of a sleeve according to the first embodiment of the present invention. FIG. 4 is a sectional view of the manufacturing apparatus according to the second embodiment of the present invention. 1...Shaft, 2...Sleeve, 2A...Dynamic pressure generating groove, 6, 10...Guide pin, 6A, 6B, 10
A, 10B...Guide hole, 6C, 10C...Center hole, 7A, 7B, 11A, 11B...Ball,
8,12...Roller.
Claims (1)
スリーブの孔に同軸上に挿入し、ガイドピンを回
転および軸方向に送りを設けてスリーブの内面に
溝を設け、前記スリーブと軸とで動圧型の流体軸
受を形成する流体軸受の製造方法であつて、前記
ガイドピンは中心軸に対して対称的にかつ放射状
に配置された複数個のガイド穴と前記ガイド穴に
連結する中心穴を有し、かつ前記ガイド穴に挿入
された前記スリーブよりも硬質な複数個のボール
と前記ガイドピンの中心穴に挿入され前記ボール
と共に回転自在でかつ軸方向の動きを規制された
前記スリーブよりも硬質なローラーを有し、前記
スリーブ内径よりも前記ローラーの直径とボール
２個分の直径の総合計をわずかに大きくなるよう
組合わされた流体軸受の製造方法。1. A guide pin having a plurality of balls on the outer periphery is coaxially inserted into the hole of the sleeve, the guide pin is rotated and fed in the axial direction, a groove is provided on the inner surface of the sleeve, and the sleeve and shaft move together. A method for manufacturing a fluid bearing that forms a pressure-type fluid bearing, wherein the guide pin has a plurality of guide holes arranged radially and symmetrically with respect to a central axis, and a center hole connected to the guide holes. a plurality of balls that are harder than the sleeve inserted into the guide hole; and a plurality of balls that are harder than the sleeve that is inserted into the center hole of the guide pin and are rotatable together with the balls and whose movement in the axial direction is restricted. 2. A method for manufacturing a hydrodynamic bearing, which has a roller having a diameter of 100 mm, and is combined so that the total sum of the diameter of the roller and the diameters of two balls is slightly larger than the inner diameter of the sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12601284A JPS616427A (en) | 1984-06-19 | 1984-06-19 | Method of manufacturing fluid bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12601284A JPS616427A (en) | 1984-06-19 | 1984-06-19 | Method of manufacturing fluid bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS616427A JPS616427A (en) | 1986-01-13 |
| JPH0349648B2 true JPH0349648B2 (en) | 1991-07-30 |
Family
ID=14924539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12601284A Granted JPS616427A (en) | 1984-06-19 | 1984-06-19 | Method of manufacturing fluid bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS616427A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0771703B2 (en) * | 1986-07-31 | 1995-08-02 | 松下電器産業株式会社 | Fluid groove forming device for hydrodynamic bearing |
| JPH085374Y2 (en) * | 1989-06-19 | 1996-02-14 | マツダ株式会社 | bearing |
| US5265334A (en) * | 1989-09-21 | 1993-11-30 | U.S. Philips Corporation | Device for manufacturing a groove bearing, and method of manufacturing a groove bearing by means of the device |
| JPH07299524A (en) * | 1994-05-02 | 1995-11-14 | Matsushita Electric Ind Co Ltd | Device for manufacturing fluid bearing |
| JP3751794B2 (en) * | 2000-05-11 | 2006-03-01 | 日本電産株式会社 | Radial bearing manufacturing apparatus, manufacturing processing tool, and manufacturing method |
| JP6605847B2 (en) * | 2015-06-05 | 2019-11-13 | ライフロボティクス株式会社 | Robot arm mechanism |
-
1984
- 1984-06-19 JP JP12601284A patent/JPS616427A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS616427A (en) | 1986-01-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |