Nsk Corporation

Eiichi Takahashi

Akira Suzuki

Kiyoshi Hirakawa

Jiami Pu

Minoru Kohari

Katsunori Yanase

Yasushi Mutoh

Yasushi Mutch

Takashi Murai

Hideki Koizumi

Toshihisa Ohata

Tatsunobu Momono

Magozou Hamamoto

Banda Noda

Kenji Okuma

Setsu Kawaguchi

A method of manufacturing steel balls for use in a ball bearing comprising an inner steel race or shaft with an inner raceway formed around its outer peripheral surface, an outer steel race with an outer raceway formed around its inner peripheral surface, and the steel balls freely rotatably disposed between the inner raceway and the outer raceway comprises the steps of providing steel balls, quenching the steel balls, preliminarily tempering the steel balls after quenched, rough-polishing the steel balls after preliminarily tempered, surface-hardening the steel balls after rough-polished, tempering the steel balls after surface-hardened, and finish-polishing the steel balls after tempered.

Method for manufacturing balls for bearing and products thereby

In a rolling bearing including an inner race; an outer race; a plurality of rolling elements rollingly arranged between the inner race and the outer race; and a cage holding the rolling elements, the cage has an annular shape and a plurality of pockets which are formed at plural positions in a circumferential direction of the cage, in which each of the pockets has an opening peripheral portion which is curved to a direction of increasing a distance from a center of the rolling elements. The opening peripheral portion forms a chamfered face or a convex face. The rolling bearing can sufficiently ensure the lubrication of sliding contact portions between the cage and rolling elements so that vibrations and noises of the rolling bearing are lowered.

Cage for a rolling bearing

Growing community of inventors

Hiratsuka, Japan

Eiichi Takahashi