JPS61112115U

JPS61112115U -

Info

Publication number: JPS61112115U
Application number: JP19613984U
Authority: JP
Priority date: 1984-12-26
Filing date: 1984-12-26
Publication date: 1986-07-16

Description

[Brief explanation of the drawing]

第１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２図は第１図に示す動圧形流体
軸受を使用したフロツピーデイスクドライバーモ
ータの断面図、第３図および第４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である
。図中、１は軸受部材、１３は円筒状孔、１５は
ラジアル軸受面、１７はスラスト軸受面、１９は
ヘリングボーン状のみぞ、２３はスラスト端面、
２５は突部、２７は流通孔、３１は軸体、３３は
ラジアル外面、３７は周みぞである。 Fig. 1 is a sectional view of a hydrodynamic bearing showing an embodiment of this invention, Fig. 2 is a sectional view of a floppy disk driver motor using the hydrodynamic bearing shown in Fig. 1, and Fig. 3. and FIG. 4 is a sectional view of a hydrodynamic bearing showing another embodiment of this invention. In the figure, 1 is a bearing member, 13 is a cylindrical hole, 15 is a radial bearing surface, 17 is a thrust bearing surface, 19 is a herringbone groove, 23 is a thrust end surface,
25 is a protrusion, 27 is a communication hole, 31 is a shaft body, 33 is a radial outer surface, and 37 is a circumferential groove.

Claims

[Claims for Utility Model Registration] (1) The cylindrical hole provided in the bearing member has a radial bearing surface provided on the inner diameter surface and a thrust bearing surface provided on the bottom surface, and the shaft provided in the cylindrical hole In a hydrodynamic bearing, the body has a radial outer surface facing the radial bearing surface and a thrust end surface facing the thrust bearing surface, and a herringbone-shaped groove is provided in at least one of the radial bearing surface and the radial outer surface. , the opening side end of the herringbone groove is located on the side of the circumferential groove provided on at least one of the inner diameter surface of the bearing member and the outer diameter surface of the shaft body, and the thrust bearing surface is located in the central portion in the axial direction. What is claimed is: 1. A hydrodynamic bearing having a protrusion projecting toward the bearing member, the protrusion being provided with a communication hole opening toward the outer surface of the bearing member. (2) The hydrodynamic bearing according to claim 1, which has an annular contact portion around the flow hole where the protrusion contacts the thrust end face. (3) The hydrodynamic bearing according to claim 1, wherein the thrust end face side surface of the protrusion has a convex spherical shape, and the protrusion and the thrust end face are in point contact.