JPH0163815U

JPH0163815U -

Info

Publication number: JPH0163815U
Application number: JP1987159816U
Authority: JP
Priority date: 1987-10-19
Filing date: 1987-10-19
Publication date: 1989-04-24

Description

[Brief explanation of the drawing]

第１図はこの考案の実施例を示す縦断側面図、
第２図および第３図は、それぞれ最小個数および
最大個数のボールを配設したときのすきまの大き
さを示す平面図、第４図はこの考案の他の実施例
を示す縦断側面図、第５図は従来の流体軸受装置
を示す縦断側面図である。図中、１０は油槽、１２は油槽の内周面、１４
は油槽の底面、２０は軸受部材、２１は軸受面、
３０は軸、３１は軸の凸形面、３２は動圧発生用
みぞ、４０はボール、５０，５１はそれぞれボー
ルが集合したときのすきま、Ｏは油槽内の底面の
中心、αは最小個数のボールを配設したときに形
成される円周方向すきまの中心角である。 Fig. 1 is a longitudinal sectional side view showing an embodiment of this invention;
Figures 2 and 3 are plan views showing the size of the gap when the minimum and maximum number of balls are arranged, respectively; Figure 4 is a vertical sectional side view showing another embodiment of this invention; FIG. 5 is a longitudinal sectional side view showing a conventional hydrodynamic bearing device. In the figure, 10 is an oil tank, 12 is an inner peripheral surface of the oil tank, and 14
is the bottom of the oil tank, 20 is the bearing member, 21 is the bearing surface,
30 is the shaft, 31 is the convex surface of the shaft, 32 is the groove for generating dynamic pressure, 40 is the ball, 50 and 51 are the gaps when the balls are assembled, O is the center of the bottom of the oil tank, and α is the minimum number of balls. This is the center angle of the circumferential clearance formed when the balls are arranged.

Claims

[Scope of utility model registration request]

In a hydrodynamic bearing device in which a bearing member that supports the end of a shaft in the axial direction via a hydrodynamic bearing is disposed in an oil tank, and a ball is disposed between the bottom surface of the oil tank and the bearing member. , when all the balls are assembled in contact with each other and there is one gap in the circumferential direction between the bottom surface of the oil tank and the bearing member, the gap is large enough to accommodate at least one ball; , the angle between the two straight lines connecting the contact points of the balls at both ends in the circumferential direction that are in contact with the inner circumferential surface of the oil tank with the center of the bottom surface of the oil tank among the gathered balls is 120. A hydrodynamic bearing device characterized in that a gap is formed with a width less than 1.5 mm.