Hydrodynamic bearing device
a technology of bearing device and bearing shaft, which is applied in the direction of sliding contact bearing, shaft and bearing, mechanical apparatus, etc., can solve the problems of increasing the number of parts, increasing the cost, and increasing the number of steps of the method, so as to prevent the stiffness of the radial bearing from decreasing, and stable non-contact rotation
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first embodiment
[0040]Hereinafter, the hydrodynamic bearing device according to a first embodiment of the present invention will be described with reference to FIGS. 1-4. The hydrodynamic bearing device of the present invention is especially useful as a spindle motor having a low cost and high reliability.
[0041]FIG. 1 is a cross sectional view of a spindle motor including a hydrodynamic bearing device according to a first embodiment of the present invention. As shown in FIG. 1, a sleeve 1 having a bearing bore 1a is made of a sintered body or sintered metal produced by sintering powdered metal containing at least one of iron, an iron alloy, copper and a copper alloy. The sleeve 1 is fixed to a base 8. A shaft 2 is made of a metal that is not a sintered body, and is inserted in the bearing bore 1a in a rotatable manner. The shaft 2 has a thrust flange 3 that is formed integrally therewith. The sleeve 1 includes a stepped end portion 1b that is coaxial with the bearing bore 1a. The stepped end portio...
second embodiment
[0059]A hydrodynamic bearing device according to a second embodiment of the present invention will be described with reference to FIGS. 5, 6 and 7. FIG. 5 is a cross sectional view of the hydrodynamic bearing according to a second embodiment. As shown in FIG. 5, a sleeve 40 having a bearing bore 40a is a cylindrical sintered body. The inner surface of the bearing bore 40a is provided with radial dynamic pressure generating grooves 9a and 9b that are formed by a cold plastic process method (component rolling method) or the like. The lower end face of the sleeve 40 in FIG. 5 is provided with thrust dynamic pressure generating grooves 10b. The sleeve 40 has independent pores in the same way as the sleeve 1 in the first embodiment.
[0060]The thrust member 44 of the thrust bearing portion is a saucer-like member made of a sintered metal or a metal material that is not a sintered metal. The thrust member 44 has a circular recess 44a. A diameter and a depth of the recess 44a are adapted to ...
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