Nsk Corporation

Other

Takayuki Yatabe

Takashi Ogawa

Hisato Yamamoto

Shoji Noguchi

Yasuhisa Terada

Hiroya Achiha

Tsuyoshi Koshi

Naoki Fukuda

Toshihisa Ohata

Norihiro Aoki

Kenji Takei

Yoichi Imamura

Fusasuke Goto

Masanori Tateishi

Kouzaburo Igari

An outer ringis formed so as to have a large thickness and the pitch circle diameters Dp of ballsare shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring racewayand an inner ring racewayare increased with respect to the diameter Db of the balls. At the same time, the diameter Db of the ballsand the thickness of an inner ringare not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring racewaybut also to prevent the inner ringfrom being damaged or cracked.

Ball bearing

An outer ring is formed so as to have a large thickness and the pitch circle diameters Dp of balls are shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring raceway and an inner ring raceway are increased with respect to the diameter Db of the balls . At the same time, the diameter Db of the balls and the thickness of an inner ring are not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring raceway but also to prevent the inner ring from being damaged or cracked.

An outer ring is formed so as to have a large thickness and the pitch circle diameters Dp of balls are shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring raceway and an inner ring raceway are increased with respect to the diameter Db of the balls At the same time, the diameter Db of the balls and the thickness of an inner ring are not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring raceway but also to prevent the inner ring from being damaged or cracked.

A one-way clutch containing rolling bearing comprises a bearing part,and an OWC part,sharing an outer race,and an inner race,The bearing part,contains a plurality of balls,and the OWC part,contains sprags,and a ribbon spring,. The balls,and the sprags,are held by a single integral-type cage

One-way clutch containing rolling bearing

A device for reciprocating a plunger according to the present invention comprises: an electric motor; a drive shaft rotated by the electric motor; an inner race fixedly mounted on the drive shaft, the inner race having an inner race track which is formed on the outer cylindrical surface of the inner race in such a manner that the inner trace track is not coaxial with the inner cylindrical surface of the inner race and the drive shaft; an outer race provided around the inner race, the outer race having an outer race track which is coaxial with the inner race track; a plurality of rolling members provided between the outer race track and the inner race track; and a plunger member movably supported in an axial direction thereof, one end of the plunger member being elastically abutted against the outer cylindrical surface of the outer race. According to the present invention, it is possible to make a manufacturing cost lower, to make the whole of the device smaller in weight, and to make a quality higher.

Device for reciprocating a plunger or the like

A rolling bearing is composed of an outer race having an inner-race raceway on an outer peripheral wall thereof, an outer race having an outer-race raceway on an inner peripheral wall thereof, a plurality of rolling elements interposed for rotation between the outer-race raceway and the inner race, and a lubricant composition filled in a space, which is defined between the inner-race raceway and the outer-race raceway, at a position where the plurality of rolling elements are disposed. The rolling bearing features: (a) at least one of the inner-race and outer-race raceways is made of steel having an oxygen content not higher than 6 ppm; (b) at least a raceway surface of said at least one raceway has been hardened by heat treatment; (c) the lubricant composition comprises as a base oil a synthetic lubricant having a kinematic viscosity of 60-160 cSt at 40.degree. C.; and (d) the lubricant composition further comprises 18-28 wt. % of a thickener which comprises a polyurea compound.

Growing community of inventors

Kanagawa, Japan

Takayuki Yatabe