Class / Patent application number | Description | Number of patent applications / Date published |
029898020 | Fluid bearing | 11 |
20080209732 | METHOD FOR USE IN THE MANUFACTURING OF A FLUID DYNAMIC PRESSURE BEARING - Oil which will serve as a lubricating fluid of a fluid dynamic pressure bearing is degassed in a first environment under a first pressure which is lower than atmospheric pressure. First and second members of the bearing are place in a second environment under a pressure lower than atmospheric pressure and higher than the pressure in the first environment. The degassed oil is supplied to the gap between bearing surfaces of the first and second members while the first and second members are in the second environment under pressure lower than atmospheric pressure and higher than the pressure in the first environment. Subsequently the pressure in the second environment is increased to force the oil into the gap between the bearing surfaces of the first and second members of the hydrodynamic fluid. | 09-04-2008 |
20080229582 | SINGLE PIECE HUB WITH INTEGRAL UPPER AND LOWER FEMALE CONES AND METHOD FOR MAKING THE SAME - To simplify fabrication of an integral hub piece, the opening between the upper and lower female cones in this hub has sufficient width or radial dimension to allow access to both cones from one side of the hub with the cutting tool. A cutting tool is used which has a width smaller than the opening between the cones. Preferably, the tool has a width which is about equal to or smaller than an angular dimension through this opening which is defined by extending surfaces of the upper and lower female cones. If this limitation is satisfied, both cones can be created with a single machine set up operating from one side of the integrated hub. | 09-25-2008 |
20080256797 | Gas Bearings (Laser) - Method for gas bearings comprising two relatively rotating parts, one part of which consists of a spindle shaft and the other part of which is provided with a bearing surface and is made from a material through which gas can be conducted to the bearing gap, for producing holes conducting gas to the bearing surface, distinguished by the steps: (a) with the aid of a high-energy beam directed towards the bearing surface, a certain number of first holes smaller than the final number of holes calculated from experience are made in the bearing surface to make a primary airflow through this part of the bearing surface possible; (b) the preliminary airflow is measured; (c) on the basis of the measured airflow, the exact number necessary of additional second holes to be made in order to obtain the desired necessary airflow is calculated; (d) the calculated number of additional second holes are made in the bearing surface. | 10-23-2008 |
20090271986 | HYDRODYNAMIC BEARING MEMBER AND MANUFACTURING METHOD THEREOF - The present invention aims to improve the efficiency of a clamping step for combining a flange with a shaft and to improve productivity. The shaft and the flange are tentatively combined in the tentative clamping step. In the tentative clamping step, a concave part at the end of the shaft is pressurized by a metal mold such as a ball to be enlarged in an outer circumferential direction, thereby pressurizing this concave part against the inner circumference of the flange so as to fix the concave part. The combined body made by tentatively combining the shaft and the flange is strongly combined in a proper clamping step. In order to correct a distortion such as a warpage of the flange that has been solidly combined by the proper clamping step, sandwiching the flange by the upper and lower metals, the flange is pressurized and a flash molding is carried out. | 11-05-2009 |
20100005662 | Method of manufacturing hydrodynamic bearing - Disclosed herein is a method of manufacturing a hydrodynamic bearing in which a metal bearing made of sintered metal powder is internally subjected to chemical etching, to form hydrodynamic pressure grooves thereon, thus assuring a high-precision and reliable hydrodynamic bearing. The method includes: compressing metal powder that is a raw material of the bearing in a press unit, and sintering the compressed metal powder at a predetermined temperature, thus preparing a sintered bearing; removing foreign substances adhering to the sintered bearing through a deburring process, and pressing the sintered bearing into a desired shape; forming a hydrodynamic groove, configured to generate hydrodynamic pressure, on an internal surface of the shaped bearing using chemical etching; and conducting a post treatment of cleaning the bearing including the hydrodynamic grooves thereon and drying the bearing. | 01-14-2010 |
20100132197 | METHOD FOR MANUFACTURING FLUID DYNAMIC BEARING DEVICE - Easy and precise setting of a predetermined thrust bearing gap is made possible. | 06-03-2010 |
20100192378 | METHOD FOR MANUFACTURING A FLUID DYNAMIC BEARING, A FLUID DYNAMIC BEARING, A MOTOR, AND A DISK DRIVE DEVICE - In the method for manufacturing a fluid dynamic bearing, the fluid dynamic bearing that lubricant is not injected into is prepared in a predetermined work space. The pressure in the work space is reduced. A delivery nozzle that delivers the lubricant is inserted into the storage region. The lubricant is delivered in the storage region so that the lubricant does not spill over from the storage region. The pressure in the work space is restored. Another way is that a lubricant is ejected after an oil repellent region for preventing the lubricant from leaking out is covered. | 08-05-2010 |
20110232093 | SHAFT MEMBER FOR HYDRODYNAMIC BEARING APPARATUSES AND A METHOD FOR PRODUCING THE SAME - A shaft material integrally having a shaft portion and a flange portion is formed by a forging process. The end face of the shaft portion of the shaft material and the end face of the flange portion on the opposite side of the shaft portion are ground relative to the corrected face, and the outer circumferential surface of the shaft material is ground relative to the end faces. This renders the cylindricity of the radial bearing faces formed on the outer periphery of the shaft portion of the produced shaft member to be 3 μm or lower. Moreover, a shaft material integrally having the shaft portion and flange portion is formed, while simultaneously thrust hydrodynamic groove regions are formed on both end faces of the flange portion. After the forging process, radial hydrodynamic groove regions are formed on the outer circumferential surface of the shaft portion. | 09-29-2011 |
20120073138 | FLUID BEARING DEVICE - Disclosed is a fluid bearing device in which a high adhesive strength is ensured in fixing another member by adhesion to a resin housing. A bearing sleeve is secured in position inside the resin housing, and a shaft member is radially supported in a non-contact fashion by a dynamic pressure action of lubricant generated in a radial bearing clearance between the shaft member and the bearing sleeve. A metal bracket for mounting the stator coil of a motor is fixed by adhesion to the outer periphery of the housing, in which the adhesion portion of the outer periphery of the housing to be fixed to the bracket is roughened, setting the surface roughness to 0.5 μmRa to 2.0 μmRa. | 03-29-2012 |
20120073139 | Dynamic bearing device - A seal member is fixed to a predetermined position on an outer peripheral surface of a shaft portion. During rotation of a shaft member, a lower end surface of the seal member is opposed to an upper end surface of a bearing sleeve through an intermediation of a thrust bearing gap to form a second thrust bearing gap. An outer peripheral surface of the seal member defines between itself and an inner peripheral surface of an upper end portion of a housing a seal space having a predetermined volume. | 03-29-2012 |
20170234366 | METHOD FOR PRODUCING A HYDROSTATIC FLUID BEARING WITH CELLS | 08-17-2017 |