JPS6019816U - Hydrodynamic bearing spindle - Google Patents

Abstract

(57) [Summary] 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 bearing spindle, Figure 2 is a sectional view of the bottom of Figure 1, and Figure 3 is a sectional view of a hydrodynamic bearing spindle designed during the development process of this invention. Fig. 4 is a sectional view of a hydrodynamic bearing spindle showing one embodiment of this invention, Fig. 5 is a sectional view of the bottom of Fig. 4, and Figs. 6 and 7 show other embodiments of this invention. FIG. 3 is a sectional view of a hydrodynamic bearing spindle. In the figure, 41 is a housing, 49 is a cylindrical hole, 51 is a thrust bearing surface, 53 is a first radial bearing surface, 55 is an inner peripheral surface, 57 is a second radial bearing surface, 61 is a shaft body, 6
7 is a pressure chamber, 69 is a thrust bearing surface, 71 is a first radial bearing surface, 73 is a hollow chamber, 75 is an outer peripheral surface, 77 is a second radial bearing surface, 79 is a first dynamic pressure generation Groove for use, 81
83 is a communication hole, and 85 is a ball bearing.

Claims (4)

[Scope of utility model registration request] (1) The cylindrical hole 49 provided in the housing 41 is connected to a thrust bearing surface 51, a first radial bearing surface 53 following the thrust bearing surface 51, and an inner circumferential surface 55 continuing to the first radial bearing surface 53. A second radial bearing surface 5 following the peripheral surface 55 of
7, and the shaft body 61 disposed in the cylindrical hole 49 has a thrust bearing surface 69 facing the thrust bearing surface 51 with a pressure chamber 67 in between, and a first radial bearing surface 53 facing the thrust bearing surface 69 and the first radial bearing surface 53. An outer circumferential surface 75 and a second radial bearing surface 5 that face the radial bearing surface 71 and the inner circumferential surface 55 with the hollow chamber 73 interposed therebetween.
and a second radial bearing surface 77 opposite to the first radial bearing surface 7, and a first dynamic pressure generation groove 79 is provided in at least one of the first radial bearing surface 53 and the first radial bearing surface 71,
The second radial bearing surface 57 and the second radial bearing surface 7
7, a pressure chamber 67 is provided in at least one of the housing 41 and the shaft body 61 when the hydrodynamic bearing spindle is operated. A communication hole 83 is provided which communicates the hollow chamber 73 with the communication hole 83, and the communication hole 83 is closed by either the first radial bearing surface 53 or the first radial bearing surface 71 when the hydrodynamic bearing spindle is stopped. The hydrodynamic bearing spindle is characterized in that the housing 41 contacts the shaft body 61 via a ball bearing 85 when the hydrodynamic bearing spindle is stopped. (2) A communication hole 83 is provided in the shaft body 61, and the communication hole 83 is provided in the shaft body 61.
3 is closed by the first radial bearing surface 53 when the hydrodynamic bearing spindle is stopped.
1) The hydrodynamic bearing spindle described in item 1). (3) Hydrodynamic bearing spindle according to claim 1 or 2, in which the housing 41 contacts the thrust bearing surface 69 via the ball bearing 85 when the hydrodynamic bearing spindle is stopped. . (4) The hydrodynamic bearing spindle according to any one of claims (1) to (3), wherein the ball bearing 85 is a radial ball bearing.