Ntn Corporation

Kimihiko Bitou

Nobuyoshi Yamashita

Kazuto Shimizu

Nao Ishiyama

Masayuki Kaimi

Isao Komori

Tetsuya Kurimura

Tetsuya Yamamoto

Masaharu Hori

Masaaki Toda

Jun Hirade

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 first axial gap (L) is formed between a seal portion () and a sleeve portion (). With this, it is possible to set a moving amount of a shaft member () in an axial direction with high accuracy irrespective of accuracy of members such as the sleeve portion ().

Fluid dynamic bearing device and assembling method thereof

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

To provide a fluid dynamic pressure bearing device that achieves high rigidity against moment without degradation in assembly precision and bearing performance, bearing sleeves are arranged in an axial direction and coaxiality of radial bearing surfaces formed on inner peripheral surfaces of the bearing sleeves is set to 3 &#x3bc;m or less. This secures width precision between the radial bearing gaps to prevent a degradation in bearing performance and a failure such as wear etc. caused by contact between a shaft member and the bearing sleeves. Further, a first radial bearing surface and a second radial bearing surface are provided on at least one sleeve, and this allows a sleeve assembly constructed from the bearing sleeves to be supported at least three positions in the axial direction in a process of assembling the sleeve assembly. As a result, assembly work can be carried out with two bearing sleeves prevented from being bent at a midway thereof, and highly accurate coaxiality between both the bearing sleeves is secured.

Fluid dynamic bearing device and manufacturing method therefor

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

Kimihiko Bitou