JP2630597B2 - Method of forming dynamic pressure generating groove of hydrodynamic bearing - Google Patents

Method of forming dynamic pressure generating groove of hydrodynamic bearing

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Publication number
JP2630597B2
JP2630597B2 JP19415987A JP19415987A JP2630597B2 JP 2630597 B2 JP2630597 B2 JP 2630597B2 JP 19415987 A JP19415987 A JP 19415987A JP 19415987 A JP19415987 A JP 19415987A JP 2630597 B2 JP2630597 B2 JP 2630597B2
Authority
JP
Japan
Prior art keywords
dynamic pressure
pressure generating
printing
ink transfer
shaft
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
Application number
JP19415987A
Other languages
Japanese (ja)
Other versions
JPS6439385A (en
Inventor
政良 大西
高橋　　毅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koyo Seiko Co Ltd
Original Assignee
Koyo Seiko Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Priority to JP19415987A priority Critical patent/JP2630597B2/en
Publication of JPS6439385A publication Critical patent/JPS6439385A/en
Application granted granted Critical
Publication of JP2630597B2 publication Critical patent/JP2630597B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】 産業上の利用分野 この発明は、動圧流体軸受の動圧発生溝の成形方法に
関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a dynamic pressure generating groove of a hydrodynamic bearing.

従来の技術とその問題点 第８図は、従来の動圧流体軸受の軸の１例を示す。FIG. 8 shows an example of a shaft of a conventional hydrodynamic bearing.

この軸（１）の外周面の軸線方向所定幅の部分が動圧
発生部（２）となっており、動圧発生部（２）の全周に
複数のヘリングボーン形の動圧発生溝（３）が円周方向
に等間隔をおいて成形され、動圧発生部（２）の溝
（３）の間の部分が丘（４）となっている。通、溝
（３）はすべて同形であり、各溝（３）の三角形状の凸
部（3a）が隣接する溝（３）の三角形状の凹部（3b）の
内側に少し入り込んでいる。このため、動圧発生部
（２）の軸線方向の全ての直線上に、溝（３）の部分と
丘（４）の部分が必ず含まれる。A portion of the outer circumferential surface of the shaft (1) having a predetermined width in the axial direction is a dynamic pressure generating portion (2), and a plurality of herringbone-shaped dynamic pressure generating grooves ( 3) are formed at equal intervals in the circumferential direction, and a portion between the grooves (3) of the dynamic pressure generating portion (2) is a hill (4). In general, the grooves (3) have the same shape, and the triangular protrusions (3a) of each groove (3) slightly enter the inside of the triangular recess (3b) of the adjacent groove (3). For this reason, all the straight lines in the axial direction of the dynamic pressure generating portion (2) necessarily include the groove (3) and the hill (4).

このような動圧流体軸受の軸の動圧発生溝を成形する
方法として、軸の動圧発生部の円周長さより大きい長さ
と動圧発生部の軸線方向の幅より大きい幅を有する印刷
型に、軸の動圧発生部の動圧発生溝の間の丘の部分の形
状に対応して耐食インクを転写するインク転写部を設け
て、残りの部分を耐食インクを転写しない非インク転写
部としておき、軸を印刷型に接触させながら回転させる
ことにより、印刷型のインク転写部から軸の動圧発生部
に丘の部分の形状を耐食インクによって印刷し、軸の動
圧発生部の印刷部分の間の非印刷部分を腐食させて動圧
発生溝を成形するものが知られている。As a method for forming the dynamic pressure generating groove of the shaft of such a hydrodynamic fluid bearing, a printing die having a length larger than the circumferential length of the dynamic pressure generating portion of the shaft and a width larger than the axial width of the dynamic pressure generating portion is used. A non-ink transfer portion for transferring the anticorrosion ink, which is provided with an ink transfer portion for transferring the anticorrosion ink corresponding to the shape of the hill between the dynamic pressure generation grooves of the shaft dynamic pressure generation portion. By rotating the shaft while making contact with the printing mold, the shape of the hill is printed with corrosion-resistant ink from the ink transfer unit of the printing mold to the dynamic pressure generating unit of the shaft, and printing of the dynamic pressure generating unit of the shaft It is known to form a dynamic pressure generating groove by corroding a non-printed portion between portions.

次に、第７図、第９図および第10図を参照して、この
方法の印刷に関する部分を詳細に説明する。なお、第７
図は印刷の原理を、第９図は印刷型（５）を、第10図は
印刷のつなぎ目を示す。Next, with reference to FIGS. 7, 9 and 10, the printing portion of this method will be described in detail. The seventh
The figure shows the principle of printing, FIG. 9 shows the printing mold (5), and FIG. 10 shows the seams of printing.

印刷型（５）は、水平状に配置される網状のスクリー
ン（６）の下面に板状のマスク（７）がはり付けられた
長方形平板状のものである。マスク（７）には軸（１）
の動圧発生部（２）の丘（４）の部分の形状に対応する
複数のインク通過穴（８）が形成され、この穴（８）の
部分がインク転写部（９）となり、残りの部分が非イン
ク転写部（10）となっている。インク転写部（９）の幅
Ｂは軸（１）の動圧発生部（２）の幅とほぼ等しく、イ
ンク転写部（９）の全長Ｌは軸（１）の動圧発生部
（２）の円周長さとほぼ等しい。The printing die (5) is a rectangular flat plate having a plate-shaped mask (7) attached to the lower surface of a net-shaped screen (6) arranged horizontally. Axis (1) on mask (7)
A plurality of ink passage holes (8) corresponding to the shape of the hill (4) of the dynamic pressure generating section (2) are formed, and the hole (8) becomes an ink transfer section (9), and the remaining ink transfer section (9) is formed. The portion is a non-ink transfer portion (10). The width B of the ink transfer portion (9) is substantially equal to the width of the dynamic pressure generating portion (2) of the shaft (1), and the total length L of the ink transfer portion (9) is the dynamic pressure generating portion (2) of the shaft (1). Is approximately equal to the circumference of.

印刷を行なう場合、たとえば、印刷型（５）の上にス
キージ（11）と耐食インク（Ｉ）を配置し、印刷型
（５）の下面に軸（１）の動圧発生部（２）を接触させ
て、印刷型（５）を第７図の矢印の方向に移動させる。
印刷型（５）を移動させることにより、これに接触して
いる軸（１）が摩擦力で同図の矢印方向に回転し、この
間に、耐食インク（Ｉ）が印刷型（５）のインク転写部
（９）を通して軸（１）の動圧発生部（２）に転写され
て、第10図に示すように、丘（４）の部分の形状が印刷
される。なお、第10図において、（12）はインクが転写
された印刷部分、（13）はインクが転写されない非印刷
部分である。When performing printing, for example, a squeegee (11) and corrosion-resistant ink (I) are arranged on a printing die (5), and a dynamic pressure generating part (2) of a shaft (1) is mounted on the lower surface of the printing die (5). The printing die (5) is moved in the direction of the arrow in FIG.
By moving the printing die (5), the shaft (1) in contact with the printing die (5) is rotated by the frictional force in the direction of the arrow in FIG. It is transferred to the dynamic pressure generating section (2) of the shaft (1) through the transfer section (9), and the shape of the hill (4) is printed as shown in FIG. In FIG. 10, (12) is a printed portion to which ink is transferred, and (13) is a non-printed portion to which ink is not transferred.

印刷型（５）にインク転写部（９）を形成する場合、
軸（１）の全周にある無端状の動作発生部（２）を軸線
方向の１つの直線で切断する必要があるが、前述のよう
に、動圧発生部（２）の軸線方向の全ての直線上に溝
（３）の部分と丘（４）の部分が必ず含まれるため、印
刷型（５）のインク転写部（９）の両端の切断線（Ts）
（Te）上には非インク転写部（10）とインク転写部
（９）が必ず含まれることになる。このため、インク転
写部（９）の全長Ｌが動圧発生部（２）の円周長さと等
しい場合には、第10図（ａ）に示すように、切断線（T
s）に対応する印刷開始箇所（Ps）と切断線（Te）に対
応する印刷終了箇所（Pe）が一致して、印刷のつなぎ目
（Ａ）にずれは生じないが、インク転写部（９）の全長
Ｌが動圧発生部（２）の円周長さより長い場合には、第
10図（ｂ）に示すように、印刷のつなぎ目（Ａ）にずれ
が生じる。そして、このように印刷のつなぎ目にずれが
生じると、丘（４）および溝（３）の形状がくずれるた
め、これを修正する必要がある。When forming the ink transfer section (9) on the printing mold (5),
Although it is necessary to cut the endless motion generating portion (2) on the entire circumference of the shaft (1) along one straight line in the axial direction, as described above, all of the dynamic pressure generating portion (2) in the axial direction is cut off. Since the grooves (3) and the hills (4) are always included on the straight line of, the cutting lines (Ts) at both ends of the ink transfer section (9) of the printing mold (5)
A non-ink transfer portion (10) and an ink transfer portion (9) are necessarily included on (Te). For this reason, when the total length L of the ink transfer section (9) is equal to the circumferential length of the dynamic pressure generating section (2), as shown in FIG.
The print start point (Ps) corresponding to s) and the print end point (Pe) corresponding to the cutting line (Te) match, so that there is no shift at the print joint (A), but the ink transfer unit (9) If the total length L is longer than the circumferential length of the dynamic pressure generating portion (2),
As shown in FIG. 10 (b), a shift occurs at the print joint (A). Then, if a shift occurs at the seam of printing, the shapes of the hills (4) and the grooves (3) are lost, and it is necessary to correct them.

この発明の目的は、上記の問題を解決し、耐食インク
により印刷を行なったときに形状のくずれが生じない動
圧流体受の動圧発生溝の成形方法を提供することにあ
る。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a method of forming a dynamic pressure generating groove of a dynamic pressure receiving fluid which does not lose its shape when printing with corrosion resistant ink.

問題点を解決するための手段 第１の発明による動圧流体軸受の動圧発生溝の成形方
法は、印刷型のインク転写部の全長を軸の動圧発生部の
円周長さより短くし、インク転写部の中間の適数箇所
に、軸の動圧発生部の円周長さと印刷型のインク転写部
の全長の差と等しい印刷型長さ方向の幅を有しかつイン
ク転写部の全幅にわたる補助非インク転写部を等間隔を
おいて設けておき、軸の動圧発生部に耐食インクによっ
て印刷したときに、印刷開始箇所と印刷終了箇所の印刷
のつなぎ目に軸線方向にのびて動圧発生部の全幅にわた
る非印刷部分が生じるようにすることを特徴とするもの
である。Means for Solving the Problems A method of forming a dynamic pressure generating groove of a hydrodynamic bearing according to the first invention is to make the total length of the ink transfer portion of the printing die shorter than the circumferential length of the dynamic pressure generating portion of the shaft. At an appropriate number of intermediate positions in the ink transfer section, the width in the print mold length direction is equal to the difference between the circumferential length of the shaft dynamic pressure generating section and the total length of the ink transfer section of the print mold, and the entire width of the ink transfer section. Auxiliary non-ink transfer sections are provided at equal intervals, and when printing is performed on the shaft's dynamic pressure generating section with corrosion resistant ink, the shaft extends in the axial direction at the joint between the printing start point and the printing end point. It is characterized in that a non-print portion over the entire width of the generating portion is generated.

第２の発明による動圧流体軸受の動圧発生溝の成形方
法は、印刷型のインク転写部の長さ方向両端にインク転
写部の全幅にわたる長方形状の補助インク転写部を設け
て、両端の補助インク転写部の内側の相互間距離を軸の
動圧発生部の円周長さより短くするとともに、両端の補
助インク転写部の外側の相互間距離を動圧発生部の円周
長さより長くし、インク転写部の中間の適数箇所に、軸
の動圧発生部の円周長さと印刷型のインク転写部の両端
の補助インク転写部の内側の相互間距離の差と等しい印
刷型長さ方向の幅を有しかつインク転写部の全幅にわた
る長方形状の補助インク転写部を等間隔をおいて設けて
おき、軸の動圧発生部に耐食インクによって印刷したと
きに、印刷開始箇所と印刷終了箇所の印刷のつなぎ目に
動圧発生部の全幅にわたる長方形状の印刷部分が生じる
ようにすることを特徴とするものである。According to a second aspect of the present invention, there is provided a method of forming a dynamic pressure generating groove of a hydrodynamic bearing, wherein a rectangular auxiliary ink transfer portion is provided at both ends in a length direction of an ink transfer portion of a printing die over the entire width of the ink transfer portion. The distance between the insides of the auxiliary ink transfer units is shorter than the circumferential length of the dynamic pressure generating unit on the shaft, and the distance between the outsides of the auxiliary ink transfer units at both ends is longer than the circumferential length of the dynamic pressure generating unit. In a suitable number of places in the middle of the ink transfer section, the printing mold length equal to the difference between the circumferential length of the shaft dynamic pressure generating section and the mutual distance between the insides of the auxiliary ink transfer sections at both ends of the printing mold ink transfer section. A rectangular auxiliary ink transfer portion having a width in the direction and extending over the entire width of the ink transfer portion is provided at equal intervals, and when printing is performed on the shaft dynamic pressure generating portion with corrosion resistant ink, the printing start position and the printing The entire width of the dynamic pressure generating section at the end of printing Upcoming is characterized in that as rectangular printed portion occurs.

作用 第１の発明によれば、印刷型のインク転写部の全長を
軸の動圧発生部の円周長さより短くしているので、イン
ク転写部の全長および動圧発生部の円周長さに多少の誤
差があっても、印刷のつなぎ目に軸線方向にのびて動圧
発生部の全幅にわたる非印刷部分が必ず生じる。このた
め、印刷のつなぎ目にずれが生じることがなく、したが
って、印刷後の形状の修正が不要である。この印刷のつ
なぎ目の非印刷部分は、次の工程で腐食させられて動圧
発生部の全幅にわたる長方形状の溝となる。また、軸の
動圧発生部には、印刷のつなぎ目の非印刷部分の他に、
印刷型のインク転写部の中間の補助非インク転写部によ
る非印刷部分も生じ、この非印刷部分も腐食させられて
動圧発生部の全幅にわたる長方形状の溝となる。そし
て、補助非インク転写部はインク転写部の中間の適数箇
所に等間隔をおいて設けているので、印刷のつなぎ目お
よび中間の補助非インク転写部により溝は動圧発生部の
全周を等分する複数箇所に位置することになり、動圧バ
ランスも良好である。According to the first aspect, the total length of the ink transfer unit of the printing die is shorter than the circumferential length of the dynamic pressure generating unit of the shaft, so the total length of the ink transfer unit and the circumferential length of the dynamic pressure generating unit are reduced. However, even if there is a slight error, a non-printed portion extending over the entire width of the dynamic pressure generating portion always extends in the axial direction at the printing joint. For this reason, no deviation occurs at the seam of printing, so that it is not necessary to correct the shape after printing. The non-printed portion of the printing joint is corroded in the next step to form a rectangular groove over the entire width of the dynamic pressure generating portion. In addition, in addition to the non-printed portion of the seam of printing,
A non-printed portion is also formed by an auxiliary non-ink transfer portion in the middle of the printing-type ink transfer portion, and the non-printed portion is also corroded to form a rectangular groove over the entire width of the dynamic pressure generating portion. Since the auxiliary non-ink transfer section is provided at an appropriate number of places in the middle of the ink transfer section at equal intervals, the groove forms the entire circumference of the dynamic pressure generating section by the printing joint and the intermediate auxiliary non-ink transfer section. Since it is located at a plurality of equally divided positions, the dynamic pressure balance is also good.

印刷のつなぎ目の非印刷部分による溝の円周方向の幅
（動圧発生部の円周長さとインク転写部の全長の差）と
中間の補助非インク転写部による溝の円周方向の幅（補
助非インク転写部の印刷型長さ方向の幅）の合計が動圧
発生部の円周長さの10％以下であるようにするのが望ま
しい。このようにすれば、余分にできる溝によって動圧
流体軸受の性能をほとんど損なうことがない。Circumferential width (difference between the circumferential length of the dynamic pressure generating section and the total length of the ink transfer section) of the groove due to the non-printing portion of the printing joint and the circumferential width of the groove due to the intermediate auxiliary non-ink transfer section ( It is desirable that the sum of the width of the auxiliary non-ink transfer portion in the printing mold length direction) is 10% or less of the circumferential length of the dynamic pressure generating portion. By doing so, the performance of the hydrodynamic bearing is hardly impaired by the extra grooves.

第２の発明によれば、印刷型のインク転写部の長さ方
向両端にインク転写部の全幅にわたる長方形状の補助イ
ンク転写部を設けて、両端の補助インク転写部の内側の
相互間距離を軸の動圧発生部の円周長さより短くすると
ともに、両端の補助インク転写部の外側の相互間距離を
動圧発生部の円周長さより長くしているので、インク転
写部の全長および動圧発生部の円周長さに多少の誤差が
あっても、印刷のつなぎ目に軸線方向にのびて動圧発生
部の全幅にわたる長方形状の印刷部分が必ず生じる。こ
のとき、印刷のつなぎ目において、インク転写部の一端
の補助インク転写部による印刷部分と他端の補助インク
転写部による印刷部分の一部が重なるが、動作発生部の
全幅にわたる長方形状の印刷部分同志が重なるため、印
刷のつなぎ目にずれが生じることがなく、したがって、
印刷後の形状の修正が不要である。この印刷のつなぎ目
の印刷部分は、次の工程で腐食されずに動圧発生部の全
幅にわたる長方形状の丘となる。また、軸の動圧発生部
には、印刷のつなぎ目の長方形状の印刷部分の他に、印
刷型のインク転写部の中間の補助インク転写部による長
方形状の印刷部分も生じ、この印刷部分も腐食されずに
動圧発生部の全幅にわたる長方形状の丘となる。そし
て、中間の補助インク転写部はインク転写部の適数箇所
に等間隔をおいて設けているので、印刷のつなぎ目およ
び中間の補助インク転写部による丘は動圧発生部の全周
を等分する複数箇所に位置することになり、動圧バラン
スも良好である。According to the second invention, a rectangular auxiliary ink transfer portion is provided at both ends in the length direction of the ink transfer portion of the printing die so as to extend over the entire width of the ink transfer portion. The distance between the outer sides of the auxiliary ink transfer sections at both ends is made longer than the circumference of the dynamic pressure generation section because the shaft is shorter than the circumference of the dynamic pressure generation section. Even if there is some error in the circumferential length of the pressure generating portion, a rectangular printed portion extending in the axial direction at the seam of printing and extending over the entire width of the dynamic pressure generating portion always occurs. At this time, at the seam of printing, a portion printed by the auxiliary ink transfer portion at one end of the ink transfer portion and a portion of the print portion formed by the auxiliary ink transfer portion at the other end overlap, but a rectangular print portion extending over the entire width of the operation generating portion. Because the comrades overlap, there is no gap between the printing seams,
There is no need to correct the shape after printing. The printed portion at the seam of this printing becomes a rectangular hill over the entire width of the dynamic pressure generating portion without being corroded in the next step. Also, in the dynamic pressure generating portion of the shaft, in addition to a rectangular printing portion at a printing joint, a rectangular printing portion by an auxiliary ink transfer portion in the middle of a printing type ink transfer portion also occurs, and this printing portion also occurs. It becomes a rectangular hill over the entire width of the dynamic pressure generating part without being corroded. Since the intermediate auxiliary ink transfer section is provided at an appropriate number of places in the ink transfer section at equal intervals, the printing joint and the hill formed by the intermediate auxiliary ink transfer section equally divide the entire circumference of the dynamic pressure generating section. Therefore, the dynamic pressure balance is good.

印刷のつなぎ目の印刷部分による丘の円周方向の幅
（動圧発生部の円周長さとインク転写部の両端の補助イ
ンク転写部の内側の相互間距離の差）の中間の補助イン
ク転写部による丘の円周方向の幅（中間の補助インク転
写部の印刷型長さ方向の幅）の合計が動圧発生部の円周
長さの10％以下であるようにするのが望ましい。このよ
うにすれば、余分にできる丘によって動圧流体軸受の性
能をほとんど損なうことがない。Auxiliary ink transfer section in the middle of the circumferential width of the hill (the difference between the circumferential length of the dynamic pressure generating section and the distance between the inner sides of the auxiliary ink transfer sections at both ends of the ink transfer section) in the circumferential direction of the hill due to the printing portion of the print joint It is desirable that the sum of the circumferential widths of the hills (the width of the intermediate auxiliary ink transfer section in the printing mold length direction) be 10% or less of the circumferential length of the dynamic pressure generating section. In this way, the performance of the hydrodynamic bearing is hardly impaired by the extra hills.

このように、いずれの発明によっても、印刷のつなぎ
目に形状のくずれが生じることがないため、修正を必要
とせず、また、動圧バランスも良好である。As described above, according to any of the inventions, the shape is not deformed at the seam of printing, so that no correction is required and the dynamic pressure balance is good.

実施例 第１図〜第３図は第１の発明の実施例（第１実施例）
を示し、第１図は動圧流体軸受の軸（20）、第２図は印
刷型（21）、第３図は印刷のつなぎ目を示す。なお、こ
れらの図面において、従来例のものと同じ部分には同一
の符号を付している。Embodiment FIGS. 1 to 3 show an embodiment of the first invention (first embodiment).
FIG. 1 shows a shaft (20) of a hydrodynamic bearing, FIG. 2 shows a printing mold (21), and FIG. 3 shows a seam of printing. In these drawings, the same parts as those of the conventional example are denoted by the same reference numerals.

印刷型（21）のインク転写部（９）の全長Laは、軸
（20）の動圧発生部（２）の円周長さより短くしてい
る。インク転写部（９）の長さ方向中央に、インク転写
部（９）の全幅にわたる長方形状の補助非インク転写部
（22）を設けている。この補助非インク転写部（22）の
印刷型（21）長さ方向の幅ａは、動圧発生部（２）の円
周長さとインク転写部（９）の全長Laの差に等しい。The total length La of the ink transfer portion (9) of the printing die (21) is shorter than the circumferential length of the dynamic pressure generating portion (2) of the shaft (20). A rectangular auxiliary non-ink transfer portion (22) is provided at the center in the length direction of the ink transfer portion (9) over the entire width of the ink transfer portion (9). The width a of the auxiliary non-ink transfer portion (22) in the length direction of the printing die (21) is equal to the difference between the circumferential length of the dynamic pressure generating portion (2) and the total length La of the ink transfer portion (9).

上記の印刷型（21）を用いて第７図のような方法で軸
（20）の動圧発生部（２）に印刷を行なった場合、イン
ク転写部（９）の全長Laが動圧発生部（２）の円周長さ
より短いので、インク転写部（９）の全長Laおよび動圧
発生部（２）の円周長さに多少の誤差があっても、印刷
開始箇所（Ps）と印刷終了箇所（Pe）の印刷のつなぎ目
（Ａ）に軸線方向にのびて動圧発生部（２）の全幅にわ
たる非印刷部分（23）が必ず生じる。このため、印刷の
つなぎ目（Ａ）にずれが生じることがなく、したがっ
て、印刷後の形状の修正が不要である。また、動圧発生
部（２）の印刷のつなぎ目（Ａ）の非印刷部分（23）か
ら180゜隔った対向位置にも、インク転写部（９）中央
の補助非インク転写部（22）による長方形状の非印刷部
分（図示略）が生じる。この非印刷部分の円周方向の幅
は、印刷のつなぎ目の非印刷部分（23）の円周方向の幅
ｂとほぼ等しい。これら２箇所の非印刷部分（23）は、
次の工程で腐食させられて動圧発生部（２）の全幅にわ
たる長方形状の溝（24）となる。ところが、これらの溝
（24）は円周方向の幅がほぼ等しく、しかも互いに180
゜隔った対向位置に設けられているので、動圧バランス
は良好である。When printing is performed on the dynamic pressure generating section (2) of the shaft (20) by the method shown in FIG. 7 using the above printing die (21), the total length La of the ink transfer section (9) is increased by the dynamic pressure generating section. Since the length is shorter than the circumferential length of the portion (2), even if there is some error in the total length La of the ink transfer portion (9) and the circumferential length of the dynamic pressure generating portion (2), the printing start position (Ps) and A non-printing portion (23) that extends in the axial direction and extends over the entire width of the dynamic pressure generating portion (2) always occurs at the printing joint (A) at the printing end portion (Pe). For this reason, no deviation occurs at the joint (A) of printing, and therefore, it is unnecessary to correct the shape after printing. In addition, an auxiliary non-ink transfer portion (22) in the center of the ink transfer portion (9) is also provided at a position 180 ° away from the non-print portion (23) of the printing joint (A) of the dynamic pressure generation portion (2). This causes a rectangular non-printed portion (not shown). The circumferential width of the non-printed portion is substantially equal to the circumferential width b of the non-printed portion (23) at the printing joint. These two non-printed parts (23)
Corrosion occurs in the next step to form a rectangular groove (24) over the entire width of the dynamic pressure generating portion (2). However, these grooves (24) have substantially the same width in the circumferential direction.
設 け The dynamic pressure balance is good because they are provided at opposing positions separated from each other.

上記実施例では、インク転写部（９）の中間の１箇所
にだけ補助非インク転写部（22）を設けて、印刷つなぎ
目とこれから180゜隔った対向位置の合計２箇所に長方
形状の溝（24）を形成しているが、インク転写部（９）
を長さ方向に等分する２以上の箇所に補助非インク転写
部（22）を設けて、軸（20）の動圧発生部（２）の全周
を等分する３以上の位置に長方形状の溝（24）を形成す
るようにしてもよい。なお、これらの長方形状の溝（2
4）の数にかかわらず、全ての溝（24）の円周方向の幅
の合計が動圧発生部（２）の円周長さの10％以下である
ようにするのが望ましい。このようにすれば、余分にで
きる長方形状の溝（24）によって動圧流体軸受の性能を
ほとんど損なうことがない。In the above-described embodiment, the auxiliary non-ink transfer portion (22) is provided only at one position in the middle of the ink transfer portion (9), and rectangular grooves are formed at a total of two positions, that is, a print seam and an opposing position separated by 180 ° therefrom. Although (24) is formed, the ink transfer portion (9)
Auxiliary non-ink transfer portions (22) are provided at two or more locations that equally divide the length in the longitudinal direction, and rectangles are formed at three or more locations that equally divide the entire circumference of the dynamic pressure generation portion (2) of the shaft (20). The groove (24) may be formed. Note that these rectangular grooves (2
Regardless of the number of 4), it is desirable that the sum of the circumferential widths of all the grooves (24) is 10% or less of the circumferential length of the dynamic pressure generating section (2). In this case, the performance of the hydrodynamic bearing is hardly impaired by the extra rectangular groove (24).

第４図〜第６図は第２の発明の実施例（第２実施例）
を示し、第４図は動圧流体軸受の軸（30）、第５図は印
刷型（31）、第６図は印刷のつなぎ目を示す。なお、こ
れらの図面において、従来例のものと同じ部分には同一
の符号を付している。4 to 6 show an embodiment of the second invention (second embodiment).
4 shows a shaft (30) of the hydrodynamic bearing, FIG. 5 shows a printing die (31), and FIG. 6 shows a seam of printing. In these drawings, the same parts as those of the conventional example are denoted by the same reference numerals.

印刷型（31）のインク転写部（９）の長さ方向両端
に、インク転写部（９）の全幅にわたる長方形状の補助
インク転写部（32s）（32e）を設けている。両端の補助
インク転写部（32s）（32e）の外側の相互間距離（外側
長さ）Loは軸（30）の動圧発生部（２）の円周長さより
長く、内側の相互間距離（内側長さ）Liは動圧発生部
（２）の円周長さより短くしている。インク転写部
（９）の長さ方向中央に、インク転写部（９）の全幅に
わたる長方形状の補助インク転写部（33）を設けてい
る。この補助インク転写部（33）の印刷型（31）長さ方
向の幅ｃは、動圧発生部（２）の円周長さとインク転写
部（９）の内側長さLiの差に等しい。Auxiliary ink transfer units (32s) (32e) having a rectangular shape over the entire width of the ink transfer unit (9) are provided at both ends in the length direction of the ink transfer unit (9) of the printing die (31). The mutual distance (outer length) Lo outside the auxiliary ink transfer units (32s) (32e) at both ends is longer than the circumferential length of the dynamic pressure generating unit (2) of the shaft (30), and the internal mutual distance ( (Inner length) Li is shorter than the circumferential length of the dynamic pressure generating portion (2). At the center in the length direction of the ink transfer unit (9), a rectangular auxiliary ink transfer unit (33) is provided over the entire width of the ink transfer unit (9). The width c of the auxiliary ink transfer section (33) in the length direction of the printing die (31) is equal to the difference between the circumferential length of the dynamic pressure generating section (2) and the inner length Li of the ink transfer section (9).

上記の印刷型（31）を用いて第７図のような方法で軸
（30）の動圧発生部（２）に印刷を行なった場合、イン
ク転写部（９）の長さ方向両端にインク転写部（９）の
全幅にわたる長方形状の補助インク転写部（32s）（32
e）を設けて、インク転写部（９）の内側長さLiを動圧
発生部（２）の円周長さより短くするとともに、外側長
さLoを動圧発生部（２）の円周長さより長くしているの
で、インク転写部（９）の外側長さLoおよび内側長さLi
ならびに動圧発生部（２）の円周長さに多少の誤差があ
っても、印刷開始箇所（Ps）と印刷終了箇所（Pe）の印
刷のつなぎ目（Ａ）に軸線方向にのびて動圧発生部
（２）の全幅にわたる長方形状の印刷部分（34）が必ず
生じる。このとき、印刷のつなぎ目（Ａ）において、イ
ンク転写部（９）の一端の補助インク転写部（32s）に
よる印刷部分と他端の補助インク転写部（32e）による
印刷部分と一部が重なるが、動圧発生部（２）の全幅に
わたる長方形状の印刷部分同志が重なるため、印刷のつ
なぎ目（Ａ）にずれが生じることがなく、したがって、
印刷後の形状の修正が不要である。また、動圧発生部
（２）の印刷のつなぎ目（Ａ）の印刷部分（34）から18
0゜隔った対向位置にも、インク転写部（９）中央の補
助インク転写部（33）による長方形状の印刷部分（図示
略）が生じる。この印刷部分の円周方向の幅は、印刷の
つなぎ目の印刷部分（34）の円周方向の幅ｄとほぼ等し
い。これら２箇所の印刷部分（34）は、次の工程で腐食
されずに動圧発生部（２）の全幅にわたる長方形状の丘
（35）となる。ところが、これらの丘（35）は円周方向
の幅がほぼ等しく、しかも互いに180゜隔った対向位置
に設けられているので、動圧バランスは良好である。When printing is performed on the dynamic pressure generating section (2) of the shaft (30) by the method as shown in FIG. 7 using the above printing mold (31), ink is transferred to both ends in the longitudinal direction of the ink transfer section (9). A rectangular auxiliary ink transfer section (32s) (32s) covering the entire width of the transfer section (9)
e), the inner length Li of the ink transfer unit (9) is made shorter than the circumferential length of the dynamic pressure generating unit (2), and the outer length Lo is set to the circumferential length of the dynamic pressure generating unit (2). The outer length Lo and the inner length Li of the ink transfer portion (9) are longer than
In addition, even if there is some error in the circumferential length of the dynamic pressure generating section (2), the dynamic pressure extends in the axial direction at the joint (A) between the print start point (Ps) and the print end point (Pe). A rectangular printed portion (34) over the entire width of the generating portion (2) always occurs. At this time, at the seam of printing (A), a portion printed by the auxiliary ink transfer portion (32s) at one end of the ink transfer portion (9) partially overlaps a portion printed by the auxiliary ink transfer portion (32e) at the other end. Since the printing portions of the rectangular shape over the entire width of the dynamic pressure generating portion (2) overlap each other, no deviation occurs at the printing joint (A).
There is no need to correct the shape after printing. In addition, the printing portion (34) of the seam (A) of printing of the dynamic pressure generating portion (2)
A rectangular printed portion (not shown) is also formed at the opposing position separated by 0 ° by the auxiliary ink transfer portion (33) at the center of the ink transfer portion (9). The circumferential width of the printing portion is substantially equal to the circumferential width d of the printing portion (34) of the printing joint. These two printed portions (34) become rectangular hills (35) over the entire width of the dynamic pressure generating portion (2) without being corroded in the next step. However, these hills (35) have substantially the same width in the circumferential direction and are provided at opposing positions separated by 180 ° from each other, so that the dynamic pressure balance is good.

上記実施例では、インク転写部（９）の中間の１箇所
にだけ補助インク転写部（33）を設けて、印刷のつなぎ
目とこれから180゜隔った対向位置の合計２箇所に長方
形状の丘（35）を形成しているが、インク転写部（９）
を長さ方向に等分する２以上の箇所に補助インク転写部
（33）を設けて、軸（30）の動圧発生部（２）の全周を
等分する３以上の位置に長方形状の丘（35）を形成する
ようにしてもよい。なお、これらの長方形状の丘（35）
の数にかかわらず、全ての丘（35）の円周方向の幅の合
計が動圧発生部（２）の円周長さの10％以下であるよう
にするのが望ましい。このようにすれば、余分にできる
長方形状の丘（35）によって動圧流体軸受の性能をほと
んど損なうことがない。In the above embodiment, the auxiliary ink transfer portion (33) is provided only at one intermediate position of the ink transfer portion (9), and rectangular hills are provided at a total of two positions, that is, a seam for printing and a facing position 180 ° away from the seam. (35) is formed, but the ink transfer section (9)
Auxiliary ink transfer units (33) are provided at two or more locations that equally divide the length of the shaft, and rectangular shapes are formed at three or more positions that equally divide the entire circumference of the dynamic pressure generation unit (2) of the shaft (30). Hills (35) may be formed. In addition, these rectangular hills (35)
Regardless of the number, the sum of the circumferential widths of all the hills (35) is desirably 10% or less of the circumferential length of the dynamic pressure generating portion (2). In this way, the performance of the hydrodynamic bearing is hardly impaired by the extra rectangular hills (35).

発明の効果 この発明の動圧流体軸受の動圧発生溝の成形方法によ
れば、上述のように、耐食インクによる印刷を行なった
ときに、印刷のつなぎ目に形状のくずれが生じることが
なく、修正を必要としない。また、動圧発生部の印刷の
つなぎ目および中間にできる余分の溝または丘が動圧発
生部の全周を等分する箇所に位置するため、動圧バラン
スも良好である。Effects of the Invention According to the method of forming a dynamic pressure generating groove of a hydrodynamic bearing of the present invention, as described above, when printing is performed with corrosion-resistant ink, the shape is not deformed at the seam of printing, No modification is required. In addition, since an excess groove or hill formed at the seam of the printing of the dynamic pressure generating portion and at the middle thereof is located at a position equally dividing the entire circumference of the dynamic pressure generating portion, the dynamic pressure balance is also good.

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

第１図は第１の発明の方法により成形された流体動圧軸
受の軸の動圧発生溝の側面図、第２図は第１の発明の方
法に使用する印刷型の平面図、第３図は第１の発明の方
法により得られた印刷のつなぎ目を拡大して表わす展開
図、第４図は第２の発明の方法により成形された流体動
圧軸受の軸の動圧発生溝の側面図、第５図は第２の発明
の方法に使用する印刷型の平面図、第６図は第２の発明
の方法により得られた印刷のつなぎ目を拡大して表わす
展開図、第７図は印刷の原理を示す説明図、第８図は従
来の流体動圧軸受の軸の動圧発生溝の側面図、第９図は
従来の方法に使用する印刷型の平面図、第10図は従来の
方法により得られた印刷のつなぎ目を表わす展開図であ
る。 （２）……動圧発生部、（３）……動圧発生溝、（４）
……丘、（９）……インク転写部、（10）……非インク
転写部、（12）……印刷部分、（13）……非印刷部分、
（20）（30）……軸、（21）（31）……印刷型、（22）
……補助非インク転写部、（23）……非印刷部分、（32
s）（32e）（33）……補助インク転写部、（34）……印
刷部分。1 is a side view of a dynamic pressure generating groove of a shaft of a fluid dynamic bearing formed by the method of the first invention, FIG. 2 is a plan view of a printing die used in the method of the first invention, and FIG. FIG. 4 is an expanded view showing a print joint obtained by the method of the first invention in an enlarged manner, and FIG. 4 is a side view of a dynamic pressure generating groove of a shaft of a fluid dynamic bearing formed by the method of the second invention. FIG. 5, FIG. 5 is a plan view of a printing die used in the method of the second invention, FIG. 6 is an expanded view showing an enlarged print seam obtained by the method of the second invention, and FIG. FIG. 8 is an explanatory view showing the principle of printing, FIG. 8 is a side view of a dynamic pressure generating groove of a shaft of a conventional fluid dynamic bearing, FIG. 9 is a plan view of a printing die used in a conventional method, and FIG. FIG. 10 is a development view showing a joint of printing obtained by the method of FIG. (2) ... dynamic pressure generating part, (3) ... dynamic pressure generating groove, (4)
... hill, (9) ... ink transfer part, (10) ... non-ink transfer part, (12) ... print part, (13) ... non-print part,
(20) (30) ... axis, (21) (31) ... print type, (22)
…… Auxiliary non-ink transfer part, (23) …… Non-print part, (32
s) (32e) (33): Auxiliary ink transfer section, (34): Print section.

Claims (4)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】軸の外周面の軸線方向所定幅の動圧発生部
の全周に複数の動圧発生溝を円周方向に所定の間隔をあ
けて成形するにさいし、軸の動圧発生部の円周長さより
大きい長さと動圧発生部の軸線方向の幅より大きい幅を
有する印刷型に、軸の動圧発生部の動圧発生溝の間の丘
の部分の形状に対応して耐食インクを転写するインク転
写部を設けて、残りの部分を耐食インクを転写しない非
インク転写部としておき、軸を印刷型に接触させながら
回転させることにより、印刷型のインク転写部から軸の
動圧発生部に丘の部分の形状を耐食インクによって印刷
し、軸の動圧発生部の印刷部分の間の非印刷部分を腐食
させて動圧発生溝を形成する動圧流体軸受の動圧発生溝
の成形方法において、 印刷型のインク転写部の全長を軸の動圧発生部の円周長
さより短くし、インク転写部の中間の適数箇所に、軸の
動圧発生部の円周長さと印刷型のインク転写部の全長の
差と等しい印刷型長さ方向の幅を有しかつインク転写部
の全幅にわたる補助非インク転写部を等間隔をおいて設
けておき、軸の動圧発生部に耐食インクによって印刷し
たときに、印刷開始箇所と印刷終了箇所の印刷のつなぎ
目に軸線方向にのびて動圧発生部の全幅にわたる非印刷
部分が生じるようにすることを特徴とする動圧流体軸受
の動圧発生溝の成形方法。1. A method for generating a dynamic pressure on a shaft, wherein a plurality of dynamic pressure generating grooves are formed at predetermined intervals in a circumferential direction on an entire circumference of a dynamic pressure generating portion having a predetermined width in an axial direction on an outer peripheral surface of the shaft. In the printing mold having a length greater than the circumferential length of the portion and a width greater than the axial width of the dynamic pressure generating portion, corresponding to the shape of the hill portion between the dynamic pressure generating grooves of the dynamic pressure generating portion of the shaft An ink transfer section for transferring the corrosion resistant ink is provided, and the remaining portion is set as a non-ink transfer section for not transferring the corrosion resistant ink, and the shaft is rotated while being in contact with the printing mold, so that the shaft is rotated from the ink transferring section of the printing mold. The dynamic pressure of the hydrodynamic bearing that prints the shape of the hill on the dynamic pressure generating part with corrosion resistant ink and corrodes the non-printed part between the printed parts of the shaft dynamic pressure generating part to form a dynamic pressure generating groove In the method of forming the generating groove, the total length of the ink transfer portion of the printing mold is defined by It has a width in the printing mold length direction equal to the difference between the circumference of the dynamic pressure generating part of the shaft and the total length of the printing ink transfer part at an appropriate number of places in the middle of the ink transfer part. In addition, auxiliary non-ink transfer portions are provided at equal intervals over the entire width of the ink transfer portion, and when printing is performed on the shaft dynamic pressure generating portion with corrosion resistant ink, the axis line is connected to the printing start point and the printing end point at the seam of printing. A method for forming a dynamic pressure generating groove of a hydrodynamic bearing, characterized in that a non-printed portion extending in the direction and extending over the entire width of the dynamic pressure generating portion is generated. 【請求項２】軸の動圧発生部の円周長さと印刷型のイン
ク転写部の全長の差と、インク転写部の中間の補助非イ
ンク転写部の印刷型長さ方向の幅との合計が、動圧発生
部の円周長さの10％以下であることを特徴とする特許請
求の範囲第１項に記載の動圧流体軸受の動圧発生溝の成
形方法。2. The sum of the difference between the circumferential length of the shaft dynamic pressure generating portion, the total length of the printing die ink transfer portion, and the width of the auxiliary non-ink transfer portion intermediate the ink transfer portion in the printing die length direction. 2. The method according to claim 1, wherein the length of the groove is 10% or less of the circumferential length of the dynamic pressure generating portion. 【請求項３】軸の外周面の軸線方向所定幅の動圧発生部
の全周に複数の動圧発生溝を円周方向に所定の間隔をあ
けて成形するにさいし、軸の動圧発生部の円周長さより
大きい長さと動圧発生部の軸線方向の幅より大きい幅を
有する印刷型に、軸の動圧発生部の動圧発生溝の間の丘
の部分の形状に対応して耐食インクを転写するインク転
写部を設けて、残りの部分を耐食インクを転写しない非
インク転写部としておき、軸を印刷型に接触させながら
回転させることにより、印刷型のインク転写部から軸の
動圧発生部に丘の部分の形状を耐食インクによって印刷
し、軸の動圧発生部の印刷部分の間の非印刷部分を腐食
させて動圧発生溝を成形する動圧流体軸受の動圧発生溝
の成形方法において、 印刷型のインク転写部の長さ方向両端にインク転写部の
全幅にわたる長方形状の補助インク転写部を設けて、両
端の補助インク転写部の内側の相互間距離を軸の動圧発
生部の円周長さより短くするとともに、両端の補助イン
ク転写部の外側の相互間距離を動圧発生部の円周長さよ
り長くし、インク転写部の中間の適数箇所に、軸の動圧
発生部の円周長さと印刷型のインク転写部の両端の補助
インク転写部の内側の相互間距離の差と等しい印刷型長
さ方向の幅を有しかつインク転写部の全幅にわたる長方
形状の補助インク転写部を等間隔をおいて設けておき、
軸の動圧発生部に耐食インクによって印刷したときに、
印刷開始箇所と印刷終了箇所の印刷のつなぎ目に動圧発
生部の全幅にわたる長方形状の印刷部分が生じるように
することを特徴とする動圧流体軸受の動圧発生溝の成形
方法。3. A plurality of dynamic pressure generating grooves are formed around the entire circumference of a dynamic pressure generating portion having a predetermined width in the axial direction on the outer peripheral surface of the shaft at predetermined circumferential intervals. In the printing mold having a length greater than the circumferential length of the portion and a width greater than the axial width of the dynamic pressure generating portion, corresponding to the shape of the hill portion between the dynamic pressure generating grooves of the dynamic pressure generating portion of the shaft An ink transfer section for transferring the corrosion resistant ink is provided, and the remaining portion is set as a non-ink transfer section for not transferring the corrosion resistant ink, and the shaft is rotated while being in contact with the printing mold, so that the shaft is rotated from the ink transferring section of the printing mold. The dynamic pressure of the hydrodynamic bearing that prints the shape of the hill on the dynamic pressure generating part with corrosion resistant ink and corrodes the non-printed part between the printed parts of the shaft dynamic pressure generating part to form the dynamic pressure generating groove In the method of forming the generated grooves, the ink is transferred to both ends in the length direction of the ink transfer part of the printing mold. A rectangular auxiliary ink transfer portion is provided over the entire width of the portion, the distance between the inner sides of the auxiliary ink transfer portions at both ends is made shorter than the circumferential length of the dynamic pressure generating portion of the shaft, and the auxiliary ink transfer portions at both ends are formed. Make the outer mutual distance longer than the circumferential length of the dynamic pressure generating section, and at the appropriate number of places in the middle of the ink transfer section, assist the circumferential length of the shaft dynamic pressure generating section and both ends of the printing type ink transfer section. A rectangular auxiliary ink transfer portion having a width in the printing mold length direction equal to the difference between the inner distances of the ink transfer portions and extending over the entire width of the ink transfer portion is provided at equal intervals,
When printing with anti-corrosion ink on the dynamic pressure generating part of the shaft,
A method for forming a dynamic pressure generating groove of a dynamic pressure fluid bearing, wherein a rectangular printing portion extending over the entire width of a dynamic pressure generating portion is generated at a joint of printing at a printing start point and a printing end point. 【請求項４】軸の動圧発生部の円周長さと印刷型のイン
ク転写部の両端の補助インク転写部の内側の相互間距離
の差と、インク転写部の中間の補助インク転写部の印刷
型長さ方向の幅との合計が、動圧発生部の円周長さの10
％以下であることを特徴とする特許請求の範囲第３項に
記載の動圧流体軸受の動圧発生溝の成形方法。4. A difference between a circumferential length of a dynamic pressure generating portion of a shaft and a distance between inner sides of auxiliary ink transfer portions at both ends of a printing type ink transfer portion, and a difference between an auxiliary ink transfer portion in the middle of the ink transfer portion. The sum of the width in the printing mold length direction is 10% of the circumferential length of the dynamic pressure generating part.
%. The method for forming a hydrodynamic groove of a hydrodynamic bearing according to claim 3, wherein the ratio is not more than%.
JP19415987A 1987-08-03 1987-08-03 Method of forming dynamic pressure generating groove of hydrodynamic bearing Expired - Lifetime JP2630597B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19415987A JP2630597B2 (en) 1987-08-03 1987-08-03 Method of forming dynamic pressure generating groove of hydrodynamic bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19415987A JP2630597B2 (en) 1987-08-03 1987-08-03 Method of forming dynamic pressure generating groove of hydrodynamic bearing

Publications (2)

Publication Number Publication Date
JPS6439385A JPS6439385A (en) 1989-02-09
JP2630597B2 true JP2630597B2 (en) 1997-07-16

Family

ID=16319903

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19415987A Expired - Lifetime JP2630597B2 (en) 1987-08-03 1987-08-03 Method of forming dynamic pressure generating groove of hydrodynamic bearing

Country Status (1)

Country Link
JP (1) JP2630597B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0418066U (en) * 1990-06-05 1992-02-14
US5315196A (en) * 1991-08-08 1994-05-24 Canon Kabushiki Kaisha Shaft with grooves for dynamic pressure generation and motor employing the same

Also Published As

Publication number Publication date
JPS6439385A (en) 1989-02-09

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