Ntn Corporation

Chikara Katagiri

Seiichi Takada

Takashi Yamamoto

Masaaki Honda

Jiro Yurimoto

Atsushi Morooka

Hidenori Wakamatsu

Kenichiro Naito

Yasumichi Kido

You Doi

Kanetsugu Tsurutani

A torque limiter comprising an inner ring fitted inside an outer member; and a torque transmission member interposed between said inner ring and said outer member. A predetermined torque is generated by a friction generated between said inner ring and said torque transmission member, when said inner ring and said outer member rotate relatively to each other. The members are impregnated with lubricating oil to slide said members on each other. The lubricating oil contains a base oil consisting of synthetic saturated hydrocarbon oil having a kinematic viscosity of 500 to 1200 mm/s at 40&#xb0; C. and an emulsifier added to said base oil. The lubricating grease contains the base oil consisting of the synthetic saturated hydrocarbon oil having a kinematic viscosity of 500 to 1200 mm/s at 40&#xb0; C. and an emulsifier and a thickener both added to said base oil.

Torque limiter

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

A thrust ball bearing includes a pair of races that make an eccentric revolving motion relative to each other. The races are formed with a plurality of opposed annular raceway grooves defined by an outer edge and an inner edge. Balls are received in the respective opposed pairs of raceway grooves. Each of the raceway grooves has a groove bottom pitch circle diameter that is smaller than the amount of offset. The height of the inner edge from the bottom of the groove is set at a predetermined value, and the height of the outer edge from the bottom of the groove is set to be larger than the height of the inner edge from the bottom of the groove. This arrangement prevents the contact ellipse of the ball from riding over the outer edge of the groove.

Thrust ball bearing

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Kuwana, Japan

Chikara Katagiri