JPS6071724U - Hydrodynamic groove bearing device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional hydrodynamic groove bearing device, Figure 2 is a bottom view of the thrust bearing surface shown in Figure 1, and Figure 3 shows the pressure distribution of fluid in the radial bearing clearance shown in Figure 1. Diagrams showing;
Fig. 4 is a chart showing the pressure distribution of the fluid in the thrust bearing clearance shown in Fig. 1, Fig. 5 is a sectional view of a spindle using a hydrodynamic groove bearing device showing an embodiment of this invention, and Fig. 6
The figure is a plan view of the thrust bearing surface shown in Fig. 5, Fig. 7 is a chart showing the pressure distribution of the fluid in the radial bearing clearance shown in Fig. 5, and Fig. 8 is a diagram showing the fluid pressure distribution in the thrust bearing clearance shown in Fig. 5. It is a chart showing pressure distribution. In the figure, 31 is a housing, 37 is a radial bearing surface, and 39
is the thrust bearing surface, 41 is the shaft member, 49 is the radial bearing clearance, 51 is the radial bearing surface, 53 is the thrust bearing face, 55 is the thrust bearing surface, 57.61 is the groove for dynamic pressure generation, 65 is the boundary part , 67 are communicating holes.

Claims (5)

[Scope of utility model registration request] (1) In the housing 31, the radial bearing surface 37 provided on the inner circumferential surface and the thrust bearing surface 39 provided on the side surface are close to each other, and the shaft member 41 disposed on the inner circumference of the housing 31 radially contacts the radial bearing surface 37. It has a radial bearing surface 51 facing the bearing clearance 49 and a thrust bearing surface 55 facing the thrust bearing surface 39 through the thrust bearing clearance 53, and at least one of the radial bearing surface 37 and the radial bearing surface 51. Miso 5 for generating dynamic pressure for radial bearings
7, the thrust bearing surface 39 and the thrust bearing surface 55 are provided.
In a hydrodynamic groove bearing device having a groove 61 for generating dynamic pressure for a thrust bearing, the radial bearing clearance and the thrust bearing clearance are A hydrodynamic groove bearing device characterized in that a communication hole 67 is provided in which a boundary portion 65 communicates with the atmosphere. (2) The hydrodynamic groove bearing device according to claim 1, wherein the communication hole 67 is provided in the shaft member 41. (3) The hydrodynamic groove bearing device according to claim 1, wherein the communication hole is provided in the housing 31. (4) Registration of a utility model in which the dynamic pressure generation groove 57 for the radial bearing is a herringbone groove, and the bent portion 59 of the herringbone groove is located on one side of the axial center of the radial bearing clearance 49. A hydrodynamic groove bearing device according to claim 1. (5) Registration of a utility model in which the dynamic pressure generation groove 61 for the thrust bearing is a herringbone groove, and the bent portion 63 of the herringbone groove is located on one side of the radial center of the thrust bearing clearance 53. A hydrodynamic groove bearing device according to claim 1.