JPS5986412U

JPS5986412U - Dynamic pressure type fluid bearing

Info

Publication number: JPS5986412U
Application number: JP18189582U
Authority: JP
Inventors: 杉　博美; 恭三郎古村; 拡光浅井
Original assignee: 日本精工株式会社
Priority date: 1982-12-02
Filing date: 1982-12-02
Publication date: 1984-06-11

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の動圧形流体軸受の断面図、第２図はこの
考案の開発過程に生じた動圧形流体軸受の断面図、第３
図はこの考案の一実施例を示す動圧形流体軸受の断面図
、第４図、第５図、第６図、第″７・図および第９図は
この考案の他の実施例を示す動圧形流体軸受の断面図、
第８図は第７図に示すスラスト軸受内面の下面図、第１
０図は第９図に糸す軸体の破砕断面図である。図中、２１は軸体、２４はラジアル外面、２５はスラス
ト軸受外面、２８は動圧発生用のみぞ、３１はスリーブ
、３６はラジアル軸受すきま、３７はラジアル軸受内面
、３８はスラスト軸受すきま、３９はスラスト軸受内面
、４２は排出穴、４６はスリーブの開口部、４７はシー
ル面、４８はシールすきま、５２は供給孔である。Figure 1 is a sectional view of a conventional hydrodynamic bearing, Figure 2 is a sectional view of a hydrodynamic bearing developed during the development process of this idea, and Figure 3 is a sectional view of a conventional hydrodynamic bearing.
The figure is a cross-sectional view of a hydrodynamic bearing that shows one embodiment of this invention, and Figures 4, 5, 6, 7, and 9 show other embodiments of this invention. Cross-sectional view of hydrodynamic bearing,
Figure 8 is a bottom view of the inner surface of the thrust bearing shown in Figure 7.
FIG. 0 is a fragmented sectional view of the thread shaft body in FIG. 9. In the figure, 21 is a shaft body, 24 is a radial outer surface, 25 is a thrust bearing outer surface, 28 is a groove for generating dynamic pressure, 31 is a sleeve, 36 is a radial bearing clearance, 37 is a radial bearing inner surface, 38 is a thrust bearing clearance, 39 is the inner surface of the thrust bearing, 42 is a discharge hole, 46 is an opening of the sleeve, 47 is a sealing surface, 48 is a seal clearance, and 52 is a supply hole.

Claims

[Scope of utility model registration request]

(1) The shaft body 21 has a radial bearing outer surface 24 provided on the outer diameter surface.
and a thrust bearing outer surface 25 provided on the end surface, and the sleeve 31 fitted to the shaft body 21 has a radial bearing outer surface 24.
The radial bearing inner surface 37 is opposed to the radial bearing inner surface 37 via the radial bearing clearance 36, and the thrust bearing inner surface 39 is opposed to the thrust bearing outer surface 25 via the thrust bearing clearance 38. In a hydrodynamic bearing having a groove 2g for generating dynamic pressure in at least one of the grooves 2g for generating dynamic pressure, there is a gap between the thrust bearing outer surface 5 and the thrust bearing inner surface 39. A supply hole 52 for supplying fluid to the radial bearing clearance 36 is provided in at least one of the shaft body 21 and the sleeve 31, and the opening 46 of the sleeve has a discharge hole 42 for discharging fluid from the shaft body 21.
The sleeve opening 46 and the sealing surface 47 face each other with a sealing clearance 48 between the sealing surface 47 provided in the sleeve and the radial bearing clearance 3 from the external fluid sealing clearance 48.
6. A hydrodynamic bearing comprising a sealing portion that prevents water from flowing into the fluid bearing.

(2) A practical model in which a filter 53 is interposed in the supply hole 52;
A hydrodynamic bearing according to claim 1.

(3) At least one of the shaft body 21 and the sleeve 31 has a circumferential groove 51 between the radial bearing clearance 36 and the seal clearance 48, and the supply hole 52 is opened in the layer groove 51. Scope of the Utility Model Registration Claim Dynamic pressure type fluid bearing according to item 1.

(4) The hydrodynamic bearing according to claim 1, wherein the discharge hole 42 opens to the outside and the supply hole 52 opens to the outside.

(5) The hydrodynamic bearing according to claim 1, in which the discharge hole 42 communicates with the supply hole 52.

(6) The gap between the opening 46 of the sleeve and the sealing surface 47 (
A hydrodynamic bearing according to claim 1, which is provided with a sealing groove 49 on both sides.

(7) The hydrodynamic bearing according to claim 6, wherein the sealing groove 49 is a spiral groove.

(8) The hydrodynamic bearing according to claim 6, wherein the sealing groove 49 is a herringbone groove.

(9) The hydrodynamic bearing according to claim 1, wherein the opening 46 of the sleeve is a magnetic fluid seal 61, and the magnetic fluid is present in the seal gap 48.

(10) The annular contact portion 43 where the thrust bearing inner surface 39 contacts the thrust bearing outer surface 25 when the bearing is stationary is connected to the discharge hole 42.
1. A hydrodynamic bearing according to claim 1 of claim 1, which has a periphery of the bearing. ←υ A dynamic pressure type fluid bearing according to claim 1, wherein at least one of the thrust bearing outer surface 25 and the thrust bearing inner surface 39 has a groove 71 for generating dynamic pressure.