JPH0184839U

JPH0184839U -

Info

Publication number: JPH0184839U
Application number: JP1987180079U
Authority: JP
Priority date: 1987-11-25
Filing date: 1987-11-25
Publication date: 1989-06-06

Description

[Brief explanation of the drawing]

第１図は本考案による動圧軸受の動圧発生溝を
加工する工具の第１実施例を示す半断面図、第２
図は第１図の―断面図、第３図は第１実施例
による工具を示す分解斜視図、第４図と第５図は
本考案による工具の第２実施例を示すものであり
、第４図はリング状部材の斜視図、第５図は組立
てられた状態を示す半断面図、第６図は動圧発生
溝の加工に使用する装置を示す一部断面を含む正
面図、第７図は加工された動圧軸受を示す断面図
、第８図と第９図は動圧発生溝の加工工程を示す
断面図、第１０図は動圧軸受が装備されている回
転ヘツド装置の断面図、第１１図は従来例に係る
動圧軸受の動圧発生溝の加工方法を示す説明図で
ある。２０…動圧軸受、２１…軸受部材、２２…軸受
穴、２４…動圧発生溝、３０…シヤンク、３０ａ
…凹部、３０ｂ…小径軸、３０ｃ…リング状部材
、３０ｅ，３０ｆ…位置決め溝、３０ｇ…斜面、
３１…球、３１ａ…球の表面、３２…銀ろう。 FIG. 1 is a half-sectional view showing a first embodiment of a tool for machining dynamic pressure generating grooves of a hydrodynamic bearing according to the present invention;
The figure is a cross-sectional view of FIG. 1, FIG. 3 is an exploded perspective view showing the tool according to the first embodiment, and FIGS. 4 and 5 show a second embodiment of the tool according to the present invention. Fig. 4 is a perspective view of the ring-shaped member, Fig. 5 is a half-sectional view showing the assembled state, Fig. 6 is a front view including a partial cross-section showing a device used for processing the dynamic pressure generating groove, and Fig. 7. The figure is a cross-sectional view showing a processed hydrodynamic bearing, Figures 8 and 9 are cross-sectional views showing the process of machining a dynamic pressure generating groove, and Figure 10 is a cross-section of a rotary head device equipped with a dynamic pressure bearing. 11A and 11B are explanatory diagrams showing a method of machining a dynamic pressure generating groove of a dynamic pressure bearing according to a conventional example. 20...Dynamic pressure bearing, 21...Bearing member, 22...Bearing hole, 24...Dynamic pressure generation groove, 30...Shank, 30a
... recess, 30b... small diameter shaft, 30c... ring-shaped member, 30e, 30f... positioning groove, 30g... slope,
31...Ball, 31a...Surface of the ball, 32...Silver wax.

Claims

[Scope of utility model registration request]

A ring-shaped member is fitted onto the tip of a small-diameter shaft formed at the tip of the shank, and positioning grooves are formed radially at equiangular pitches on the end surface of this ring-shaped member on the shank side. A plurality of balls are inserted into the recesses formed between the ring-shaped member and the outer circumferential surface of the small-diameter shaft, and the balls are inserted into the shank by positioning grooves formed in the ring-shaped member. A tool for machining the dynamic pressure generating groove of a dynamic pressure bearing, which is positioned so as to surround the shaft center at equal angular pitches, and which is fixed so that its surface protrudes from the outer peripheral surface of the shank.