Special Issue; Products for Industrial Machinery - NTN

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NTN TECHNICAL REVIEW No.742006 the Hybrid Bearphite, does not damage the polycarbonate by chemical attack. 4.5 Electrically conductive Hybrid Bearphite EC Electrophotographic printers and copying machines utilize static electricity to form an image and transfer the toner to paper stocks. For this reason, if the bearings on the photosensitive drum are triboelectrically charged, the static electricity and toner on the photosensitive drum (Fig. 1) will be adversely affected and the latent image on the photosensitive drum will be disturbed. The static charge on certain bearings other than those on the photosensitive drum needs to be eliminated. This is achieved with a grounding mechanism, but provision of the grounding mechanism causes the number of associated parts to increase. Therefore, such bearings are sometimes required to be electrically conductive. Any ordinary resin material is electrically nonconductive and does not satisfy this requirement. Therefore, to address this challenge, we developed the electrically conductive Hybrid Bearphite EC by adding nanometer-sized carbon particles into the resin sliding material . The volume resistivity of this resin is 3 x 10 3 cm, and this performance value is sufficient for elimination of static charge from the bearing. Its friction characteristics for sliding action with a Niplated shaft are summarized in Fig. 14. Addition of carbon particles caused the friction coefficient to increase to approximately 0.1. However, this level is half or less compared with that of other electrically conductive resin sliding materials available on the market. Incidentally, the physical properties of the Hybrid Bearphite EC, including chemical attack resistance, are equivalent to those of the electrically insulating Hybrid Bearphite. 5. Conclusion Our Hybrid Bearphite, a sintered metal sliding bearing with a resin insert, boasts higher accuracy and lower torque at a decreased cost. This sliding bearing will be used in a diverse variety of industrial fields other than office automation equipment, and its applications include the replacement of rolling bearings as well as provision of improved functionality for sliding bearings. We will remain committed to improving the physical properties, including the heat resistance, of Hybrid Bearphite in order to contribute actively to the development of compacter and lighter designs that allow lower energy consumption and reduced costs for a variety of equipment. References 1) Egami, Shimizu, Ohira: Tribology Meeting Draft Proceedings 2006-5 Tokyo (2006) p. 313. (In Japanese) 2) Egami, Hirose: Development of Plastic Sliding Materials for OA Equipment, NTN Technical Review, No.67 (1998) p.98. (In Japanese) 3) Shimazu, Egami, Shimokusuzono: Tribology Meeting Draft Proceedings 1998-10 Nagoya (1998) p. 379. (In Japanese) 4) Tsutsui, Egami, Ishii: Tribology Meeting Draft Proceedings 2003-5 Tokyo (2003) p. 77. (In Japanese) Friction coefficient 0.40 0.35 0.30 0.25 0.20 0.15 Bearing dimensions: ID 8 mm, width 5 mm Radial load: 29.6 N Rotation speed: 120 min -1 Counterpart shaft: Ni-plated Conductive Hybrid Bearphite EC Hybrid Bearphite (non-conductive) Resin sliding material on the market 0.10 0.05 0.00 0 5 Fig. 14 Friction property of electrically conductive “HYBRID BEARPHITE EC” 10 Test duration h 15 20 -114-
"Hybrid Bearphite" a Sintered Metal Sliding Bearing Inserted with Plastic Photo of author Masaki EGAMI Elemental Technological R&D Center -115-
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88th Anniversary Special Issue; Pro
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NTN TECHNICAL REVIEW No.742006 Pref
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Trends in Recent Machine Tool Techn
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Development of a New Grease Lubrica
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High-Speed Tapered Roller Bearing f
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Minimum Quantity and Cooling Jet Lu
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Minimum Quantity and Cooling Jet Lu
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dmn17010 4 Sealed High-speed Angula
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Development of Aerostatic Bearing S
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Development of Aerostatic Bearing S
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Atmospheric Control Method for JIS-
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The Influence of Hydrogen on Tensio
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