Ntn Corporation

Fukui Byora Co., Ltd.

Koji Yamagata

Nobuyoshi Yamashita

Toshiyuki Mizutani

Tetsuya Kurimura

Eiichi Fujita

Masato Utiumi

Kiyoshi Shimizu

Yoshitaka Kabata

Masatoshi Tanigawa

Natsuhiko Mori

Takeshi Shimazaki

Toshiyuki Mizytani

A housing for a fluid lubrication bearing apparatus is produced. The housing has a cylindrical shape whose inner periphery having a fixing face to which an outer circumferential surface of a bearing sleeve is to be fixed. The method includes providing a forging mold having a groove molding portion extending parallel to a direction of a stroke of said mold and a face molding portion having a convex cylindrical shape on an outer periphery of the forging mold for forming the fixing face of the housing. The method further includes forming the housing with the forging mold, while forging circulation grooves and the fixing face simultaneously on the inner periphery of the housing with the groove molding portion and the face molding portion of the forging mold.

Method for producing a housing for a fluid bearing apparatus

A fluid bearing apparatus includes a housingwhich has a cylindrical shape having a fixing facefor fixing the outer circumferential surfaceof a bearing sleeve, and axial circulation groovesfor bringing both end facesof the bearing sleeveinto circulation on the inner periphery by forging. A groove molding portionis provided on the outer circumference of a rodwhich serves as a forming mold for the inner periphery of the housing, and the circulation groovesare formed by forging with this groove molding portion. Moreover, after a sealing faceand a cylindrical outer circumferential surfaceprovided on the outer periphery of the housingare formed by forging, an inner circumferential surfaceis formed by forging.

Fluid bearing apparatus

A low-cost shaft member for hydrodynamic bearing apparatuses restores the pressure balance in a thrust bearing gap formed on both axial sides of the flange portion in an early stage. A shaft material integrally having a shaft portion and a flange portion with a through-hole between both end faces of the flange portion is formed in a common forging step. As a result, the through-hole is formed to open to an inner diameter side of the bearing gaps avoiding the thrust bearing gaps formed on both end faces of the flange portion of the shaft member as a finished product.

Shaft member for fluid lubrication bearing apparatuses and a method for producing the same

A method for producing a housing for a hydrodynamic bearing apparatus includes forming a housingwhich has a cylindrical shape and which includes a fixing facefor fixing the outer circumferential surfaceof a bearing sleeve, and axial circulation groovesfor bringing both end facesof the bearing sleeveinto circulation on the inner periphery. The method includes providing a groove molding portionon the outer circumference of a rodwhich serves as a forming mold for the inner periphery of the housing, and forming the circulation groovesof the housing by forging with the groove molding portionof the mold. Moreover, after a sealing faceand a cylindrical outer circumferential surfaceprovided on the outer periphery of the housingare formed by forging, an inner circumferential surfaceis formed by forging.

Growing community of inventors

Awara, Japan

Koji Yamagata