Ntn Corporation

Atsushi Morooka

Seiichi Takada

Katsumi Nagano

Hidenobu Mikami

Kazuo Hirose

Toshiyuki Mizutani

Masakazu Hirata

Masaaki Honda

Yoshihiko Oeda

Ikuma Fujitsuka

Jiro Yurimoto

Chikara Katagiri

Kenichiro Naito

Hidenori Wakamatsu

Yasumichi Kido

You Doi

It is an object of the present invention to provide a sliding bearing which has a simple construction and thus can be produced easily and at a low cost and yet eliminates the need for the use of a heat insulation sleeve and the like and is capable of maintaining a frictional torque to a low extent. A sliding bearing () has an inner ring (), an outer ring (), and a sliding contact member () interposed therebetween. The inner ring () has a curved surface () formed along an outer circumference thereof and a shaft-receiving hole which fits on a supporting shaft along an inner circumference thereof. The sliding contact member () is a molded body, made of resin composition, which has a curved surface () making sliding contact with the curved outer circumferential surface () of the inner ring () with the curved surface () being opposed to the curved outer circumferential surface (). The outer ring () does not contact the inner ring () and holds the sliding contact member () on an inner circumferential side thereof with the outer ring () covering the sliding contact member (). The outer ring () has an open portion () formed on an axial one end surface thereof and a pawl portion () formed at an edge of the open portion (). The sliding contact member () is combined with the outer ring () by inserting the sliding contact member () into the outer ring () from the open portion () thereof and fixed by the pawl portion ().

Sliding bearing

An electroconductive grease-filled bearing is a rolling bearing comprising an inner raceand an outer race, both of the races being coaxially provided, a plurality of steel ballsradially being retained between track surfaces of the races, the bearing rotatably supporting the edge of heating rollin the fixing section of an electrostatic transfer copying machine, fixed to the inner periphery of inner race, an electroconductive grease to be filled between the track surfaces comprising a fluorocarbon oil as a base oil and graphite (or together with polytetrafluoroethylene) as a thickening agent. The electroconductive grease has a distinguished electroconductance so as to effectively discharge the static electricity, and has a distinguished heat-resistant durability even at elevated temperatures, and also prevents revolution failure due to the increased torque caused by an excessive lowering in the grease consistency, while maintaining the good electroconductance. The bearing is most suitable for rotatably supporting a photosensitive drum or a heating roll or a pressing-heating roll in the fixing section in an electrostatic transfer copying machine, and is also effective for stabilization of printed images.

Electroconductive grease-filled bearing

Disclosed is a lubricating composition such as a lubricant, a lubricating grease, or a rust preventive oil for use in a torque limiter and a ball-and-roller bearing; the lubricating composition having chemical attack resistance for a synthetic resin molded product. The lubricating composition comprises as a base oil at least one synthetic saturated hydrocarbon oil selected from the group consisting of a poly-&agr;-olefin, and an ethylene-&agr;-olefin copolymer. When a phosphoric acid ester is used as a compounding agent, or at lease one lubricating grease selected from the group consisting of an urea compound, silica powder, and bentonite powder is mixed therein, the lubricating composition is a rust preventive oil using a metal salt of sulfonic acid and the like. The lubricating composition is suitably used for machine parts of a business machine including the synthetic resin molded product.

Lubricating composition

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Mie, Japan

Atsushi Morooka