Nsk Corporation

Nariaki Aihara

Toshikazu Yabe

Takahiko Uchiyama

Keisuke Yokoyama

Takeshi Murakami

Toshimi Takajo

Takayuki Hiramoto

Yoshikazu Kuramoto

Kenichi Iso

Kinji Yukawa

Junji Ono

Morio Sorimachi

Jianjun Zhan

Takiyoshi Yamada

Masahiro Harunaga

Makoto Yasuda

Tosikazu Yabe

Takesi Murakami

The magnetic encoder is constituted by integrally bonding a magnet portion obtainable by forming a magnetic material containing a magnetic powder and a binder for the magnetic powder in a circular ring shape to a slinger. The binder contains at least a thermoplastic resin and an impact resistance-improving agent.

Magnetic encoder and roller bearing unit having magnetic encoder

The resin injection gate is disposed at the pillar part. When the bearing cage is divided into first and second regions by an imaginary line connecting the resin injection gate and a weld to be formed at a position radially facing the resin injection gate, a resin reservoir that can store therein the melted resin is formed at the pillar part in only one of the regions. A circumferential distance between the resin reservoir and the weld is smaller than a circumferential distance between the resin reservoir and the resin injection gate. A cross-sectional area of a communicating part of the resin reservoir, which is configured to communicate with the pillar part, is equal to or less than a quarter of a cross-sectional area of the resin injection gate.

Bearing cage and manufacturing method therefor

A magnet portionof a magnetic encoderincludes a magnetic member and a resin, and a highly reliable magnetic encoderhaving a high magnetic property and enabling to detect a rotational number with high accuracy, and a hub unit bearinga are provided. Further, the resin is preferably a thermoplastic resin and further preferably includes a thermoplastic resin including a soft segment in a molecule. Further, the magnetic encoderfurther includes a fixed memberattached with the magnet portionand comprising a magnetic material, and the magnet portionand the fixed memberare bonded by an adhering agent including at least one of a phenolic resin based and an epoxy resin based.

Magnetic encoder and bearing

A resin reservoir capable of storing the melted resin is provided in the pillar radially facing the pillar provided with the resin injection gate having a cross-sectional area larger than those of the other resin injection gates among a plurality of the pillars not provided with the resin injection gate or the pillar in the vicinity of the pillar facing the pillar provided with the resin injection gate having a cross-sectional area larger than those of the other resin injection gates among the plurality of the pillars not provided with the resin injection gate. A cross-sectional area of a communicating portion of the resin reservoir which communicates with the pillar is smaller than the smallest of cross-sectional areas of a plurality of the resin injection gates.

Method for manufacturing bearing cage

A resin snap cagecomprises a resin-made circular main part, a plurality of pocketsprovided in one axial end face of the circular main part, and a circular reinforcing memberinstalled concentrically at the other end face in an axial direction of the circular main part. While this reinforcing memberis circular along the circular main part, a sectional shape in a plane parallel to an axial direction is a rectangle. The reinforcing memberis embedded in a recessed portion formed at the other end face in an axial direction of the circular main partto be integrated, an outside diameter surface, an inside diameter surface, and a pocket-side surfaceof the reinforcing memberare covered with the circular main part, and a surfacethereof opposite to the pocket side is exposed. This resin snap cageis produced by insert molding where the reinforcing memberis made as an insert, and the circular main partand the reinforcing memberare integrated at the time of the insert molding.

Resin cage and rolling bearing

A magnet portionof a magnetic encoderincludes a magnetic member and a resin, and a highly reliable magnetic encoderhaving a high magnetic property and enabling to detect a rotational number with high accuracy, and a hub unit bearingare provided. Further, the resin is preferably a thermoplastic resin and further preferably includes a thermoplastic resin including a soft segment in a molecule. Further, the magnetic encoderfurther includes a fixed memberattached with the magnet portionand comprising a magnetic material, and the magnet portionand the fixed memberare bonded by an adhering agent including at least one of a phenolic resin based and an epoxy resin based.

A rubber composition containing a tetrafluoroethylene-propylene bipolymer and from 0.02 to 10 parts by weight of a liquid polybutadiene per 100 parts by weight of the tetrafluoroethylene-propylene bipolymer and a rubber sealing device in which the rubber composition is joined to a reinforcing member are described, by which long-life rubber sealing devices which are highly tolerant to liquids containing amine-based additives, for example, soluble-type synthetic cutting coolants and engine oils suitable for high-speed processing and can sustain favorable sealing performance over a long period of time and rubber compositions appropriate therefor are provided.

Rubber composition and rubber sealing device

The present invention provides a rolling bearing having a prolonged life suitable for wheel, railway vehicle and steel rolling mill comprising a sealing member which exhibits fair sealing properties even under severe conditions. A rolling bearing comprising an outer ring having an outer raceway formed on the inner surface thereof, an inner ring having an inner raceway formed on the outer surface thereof, a plurality of rolling elements rollably provided between the outer ring and the inner ring, and a sealing member for sealing the axial opening of the space between the inner surface of the outer ring and the outer surface of the inner ring in which said rolling elements are provided, characterized in that the sealing member is formed by an elastic member made of a vulcanizable rubber composition obtained by blending a carboxylated acrylonitrile-butadiene rubber with at least carbon black.

Rolling bearing

A linear guide apparatus includes a slider, a guide rail opposing the slider with a clearance provided therebetween, a plurality of rolling elements which are rotatably interposed there between, and a contact seal device for sealing an opening of the clearance. A side seal member of the contact seal device is made of a rubber material composition containing fluoro rubber. The rubber basically comprises at least one of copolymers that are vinylidenefluoride-tetrafluoroethylene-polypropylene terpolymer and tetrafluoroethylene-polypropylene copolymer.

Bearing apparatus

A lubricant-containing polymer-filled rolling bearing comprising a lubricant-containing polymer packed in the space formed by an outer race, an inner race and rolling elements, wherein the lubricant-containing polymer is packed with the interposition of a grease layer having a thickness of from 10 &mgr;m to 1,000 &mgr;m formed at least on the inner peripheral surface of the outer race, the outer peripheral surface of the inner race and the surface of the rolling elements and a lubricant-containing polymer-filled rolling bearing comprising an inner race, an outer race, a plurality of rolling elements provided between the inner race and the outer race, a cage protruding outwardly from the end face of either the inner race or the outer race and retaining the rolling elements, and a lubricant-containing polymer packed in the space formed by the inner race, the outer race, the rolling elements and the cage, wherein the cage is covered with the lubricant-containing polymer.

Growing community of inventors

Kanagawa, Japan

Nariaki Aihara