Ntn Corporation

Eiichi Fujita

Tetsuya Kurimura

Nobuyoshi Yamashita

Toshiyuki Mizutani

Koji Yamagata

Kiyoshi Shimizu

Masato Utiumi

Yoshitaka Kabata

Masatoshi Tanigawa

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 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

Eiichi Fujita