Nsk Corporation

Isao Shintou

Kazuto Kobayashi

Hiroshi Koyama

Nobuyuki Hagiwara

Toshio Nakamura

Kiyoshi Ootsuka

Keiichi Horino

Tomohiro Kudou

Mizuki Watanabe

Kouhei Mori

A first piece () includes a first ring portion () and a second ring portion () which are arranged side by side in an axial direction and an inner diameter and an outer diameter of the first ring portion () are respectively larger than an inner diameter and an outer diameter of the second ring portion (). A second piece () is obtained by pressing the first piece () while the first piece () is disposed between a first set and a second set.

Bearing element manufacturing method, bearing manufacturing method, machine manufacturing method, vehicle manufacturing method, bearing element, bearing, machine, and vehicle

A method of manufacturing a rotating bearing unit includes to cause one end surface in the axial direction of the forming punch (), formed by combining a plurality of punch elements () divided in the circumferential direction, which are displaceable in the axial direction and which are not displaceable in the circumferential direction, and having a processing teeth () at one end surface in the axial direction, to face the other end surface of the caulking section () in the axial direction. In this state, rolls () are rotated about the central axis (&#x3b1;) of the hub main body () while pressing the other end surface of the forming punch () in the axial direction with a pressing surface () of the roll () having a central axis (&#x3b2;) that is inclined with respect to the central axis (&#x3b1;) of the hub main body ().

Method and device for manufacturing bearing unit

A method for manufacturing a rolling bearing unit is provided to periodically reciprocate a stage () in a vertical direction by rotating and driving a servo motor () while rotating a roll about a central axis of a hub main body using a roll driving motor () in a state in which a processing surface of the roll is pressed against other end surface of a caulking section in an axial direction. A period of the reciprocation is restricted by a relation between a rotation position of the roll about the central axis of the hub main body and an engaged state between concave sections, which are sections between a plurality of processed teeth formed in the processing surface of the roll, and a face spline tooth formed by the concave section.

Method for manufacturing rolling bearing unit and method for manufacturing vehicle

A rotary press device () includes a restriction section () configured to restrict a motion of a roll () around a central axis of a roll () against movement of the roll () around a central axis of a hub main body () during rotary forging. In an example, the restriction section () has guide teeth () meshed with teeth formed on a processing surface of the roll ().

Method of manufacturing bearing unit, and rotary press device

Construction is achieved that is capable of preventing the formation of radial streaks in the tip-end surfaces of teeth of hub-side face splines. When a swing center distance is taken to be L, a swing angle that is the inclination angle of the center axis of a rollwith respect to a main hub bodyis taken to be &#x3b8;, the pitch diameter of the hub-side face splinesis taken to be D, the number of teeth of the hub-side face splinesis taken to be N, and the number of teeth of a processing surfaceof the rollis taken to be N, the position relationship of the main hub bodyand the roll, or in other words, at least one of the swing center distance L, the swing angle &#x3b8;, and the pitch circle diameter Dis regulated so that the relationship Nh/Nr=cos &#x3b8;+(2L/D)&#xb7;sin &#x3b8; is satisfied.

Method for manufacturing rolling bearing unit

A method of manufacturing a drawn cup needle roller bearing having a seal ring, including forming the seal ring by a press working by: punching a metal plate to form an annular first intermediate material; subjecting the first intermediate material to burring working such that a portion close to an inner diameter of the first intermediate material is bent in an axial direction at a right angle to form an annular second intermediate material having an L-shaped cross section, the second intermediate material comprising a cylindrical portion and an outward flange portion which is bent radially outward from an axial end portion of the cylindrical portion; removing the outward flange portion to form a cylindrical third intermediate; and subjecting the third intermediate material to cold rolling working to regulate an inner diameter, an outer diameter and a cross sectional shape of the third intermediate material.

Manufacturing method of a drawn cup needle roller bearing having seal ring

A drawn cup needle roller bearinghaving a seal ring comprises: a shellhaving a raceway surfaceon an inner circumferential face and also having inward flange portionsin both end portions; a cagehaving a plurality of pocketsin a circumferential direction and worked by cutting; a plurality of needlesretained in the pocketsso that the needles freely rotate along the raceway surface; and a seal ring, the shape of which is cylindrical, arranged inside the shellbetween an end faceof the cageand the inward flange portion. The seal ringcomposes a floating seal and is formed by press working. Due to the foregoing, an excellent dimensional accuracy can be provided and a quantity of lubricant passing through the bearing can be controlled.

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Fujisawa, Japan

Isao Shintou