Ntn Corporation

Kazuto Shimizu

Kimihiko Bitou

Nobuyoshi Yamashita

Nao Ishiyama

Masayuki Kaimi

Tetsuya Yamamoto

Isao Komori

Masaharu Hori

Toshiyuki Mizutani

Jun Hirade

Provided is a fluid dynamic bearing device, which fixes a lid member () to a bracket () or forms the lid member () and the bracket () integrally so that the bracket () exerts the release resistance of the lid member (). As a result, the fluid dynamic bearing device can alleviate a fixing force required between a housing () and the lid member () or can make their fixture unnecessary, to thereby maintain the release resistance of the lid member () irrespective of a material of the housing ().

Fluid dynamic bearing device

An apparatus for manufacturing a hydro dynamic bearing device is provided for the finishing treatment of lubricating oil after lubricating the hydro dynamic bearing device, specifically for properly and effectively wiping off the lubricating oil adhering to the outside of the housing and adjusting the oil-level height of the lubricating oil filled in the housing.

Apparatus for manufacturing hydro dynamic bearing device

A fluid dynamic bearing apparatus includes shaft member, housing, sleeve portion, and sealing portions. The housingincludes a straight cylindrical inner circumferential surface with a constant diameter and openings at both axial ends thereof. The sleeve portionis provided separately from the housingand fixed to the inner circumferential surface of the housing. A radial bearing gap is formed between the inner circumferential surfaceof the sleeve portionand the outer circumferential surfaceof the shaft member, and thrust bearing gaps are formed between the end facesof the sealing portionsand the end facesof the sleeve portionopposing these to support the shaft memberin a non-contact manner in the radial direction and in the thrust direction by the hydrodynamic effect of a lubricating oil produced in each bearing gap.

Fluid dynamic bearing apparatus

A shaft portion is press-fitted to a flange portion, and a plastic working portion of a first jig is pressed against an upper end surface of the flange portion, whereby the flange portion is partially subjected to plastic deformation toward an inner peripheral side. With this, a caulked portion is formed between the flange portion and the shaft portion. Further, press-fitting and caulking are performed in a state in which both end surfaces of the flange portion are bound by a second jig and a third jig.

Shaft member for fluid bearing device and method of producing the same

A method for manufacturing a hydro dynamic bearing device is provided for the finishing treatment of lubricating oil after lubricating the hydro dynamic bearing device, specifically for properly and effectively wiping off the lubricating oil adhering to the outside of the housing and adjusting the oil-level height of the lubricating oil filled in the housing. The method for manufacturing the hydro dynamic bearing constructed of an axial member housed in a housing, a radial bearing part for supporting the axial member in a non-contact manner in a radial direction by a hydro dynamic pressure action of the lubricating oil generated in a radial bearing clearance, and a sealing part arranged in an opening part of the housing, has the steps of: applying the lubricating oil to an unlubricated hydro dynamic bearing device; and blowing a gas on the outer peripheral surface of the housing, while sucking the lubricating oil from the sealing space of the sealing part or the vicinity thereof using a suction device that generates a negative-pressure suction force.

Method for manufacturing hydro dynamic bearing device

An apparatus for manufacturing a hydro dynamic bearing device is provided for the finishing treatment of lubricating oil after lubricating the hydro dynamic bearing device. The hydro dynamic bearing is constructed of an axial member housed in a housing, a radial bearing part for supporting the axial member in a non-contact manner in a radial direction by a hydro dynamic pressure action of the lubricating oil generated in a radial bearing clearance, and a sealing part arranged in an opening part of the housing, and the apparatus has a laser for measuring an oil-level height of the lubricating oil in the housing.

Apparatus for manufacturing hydro dynamic bearing device method

A method for manufacturing a hydro dynamic bearing device is provided for the finishing treatment of lubricating oil after lubricating the hydro dynamic bearing device. The hydro dynamic bearing is constructed of an axial member housed in a housing, a radial bearing part for supporting the axial member in a non-contact manner in a radial direction by a hydro dynamic pressure action of the lubricating oil generated in a radial bearing clearance, and a sealing part arranged in an opening part of the housing, and the method has the step of measuring the oil-level height of the lubricating oil in the housing by a laser detector.

A method and an apparatus for manufacturing a hydro dynamic bearing device is provided for the finishing treatment of lubricating oil after lubricating the hydro dynamic bearing device, specifically for properly and effectively wiping off the lubricating oil adhering to the outside of the housing and adjusting the oil-level height of the lubricating oil filled in the housing. The method for manufacturing the hydro dynamic bearing constructed of an axial member housed in a housing, a radial bearing part for supporting the axial member in a non-contact manner in a radial direction by a hydro dynamic pressure action of the lubricating oil generated in a radial bearing clearance, and a sealing part arranged in an opening part of the housing, has the steps of applying the lubricating oil to an unlubricated hydro dynamic bearing device; and blowing a gas on the outer peripheral surface of the housing, while sucking the lubricating oil from the sealing space of the sealing part or the vicinity thereof using a suction device that generates a negative-pressure suction force.

Growing community of inventors

Kuwana, Japan

Kazuto Shimizu