Nsk Corporation

Kiyoshi Ootsuka

Kazuto Kobayashi

Keiichi Horino

Tomohiro Kudou

Koji Hashimoto

Tatsuo Wakabayashi

Isao Shintou

Tomofumi Yamashita

Yuu Yasuda

Toshio Nakamura

Shinobu Mogi

Toru Harada

Shingo Saitou

Shouji Yokoyama

Atsushi Watanabe

Kotaro Hirota

Kenichi Nagai

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 method forms a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die. Letter S shaped concaves are formed on an inner circumferential surface of a nut blank, by pressing by use of a die having a blank holder, a cam driver, cam sliders, and a cylindrical member. The cam driver has inclined surfaces having the same angle of inclination as the cam sliders. The cam sliders have letter S shaped convexes corresponding to the letter S shaped concaves, and are held by through holes, respectively. When the cam driver is pressed from the top thereof, the cam sliders move outwardly in the radial direction, respectively, and the letter S shaped convexes push the inner circumferential surface of the nut blank for plastic deformation.

Method for manufacturing nut for ball screw and ball screw

This invention provided a manufacturing method to process a small-diameter step sectionon an inside end section of a hub bodythat comprises an outward facing flangeand a positioning cylinderstably and with high precision. In this invention, an intermediate materialis pressed between a lower punchand an upper punchwith an outer peripheral surface of the intermediate materialbeing held by a lower dieand an upper die, and then a part of the intermediate materialis pressed into the lower punchsuch that the small-diameter step sectionis formed by cold plastic working.

Process for manufacturing a bearing ring member as a constituent of a rolling bearing unit for wheel support

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.

When a punch is downwardly pressed, an inner circumferential surface of a first rack blank bites into a top surface of a second rack blank. A blank material upwardly flows due to a reaction force and is used to form rack teeth. Thus, a filling degree of the teeth with the material is enhanced. At the time when the forming of the rack teeth is finished, a gap is left between the inner circumferential surface of the first rack blank and the outer circumferential surface of the second rack blank. Thus, a die is not put into a sealed condition. Consequently, a forming load is small so that the lifetime of the die is lengthened. Also, the top surface of the second rack blank bites into a bore hole portion of the first rack blank so that the first rack blank and the second rack blank are joined together. Accordingly, the rigidity of the entire rack teeth is increased.

Steering rack and method of manufacturing the same

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Fujisawa, Japan

Kiyoshi Ootsuka