Ntn Corporation

Krd Corporation

Tsukasa Yamakawa

Katsunori Sone

Naoaki Tsuji

Hideji Ito

Takashi Ito

Takashi Tsujimoto

Naota Yamamoto

Tsutomu Sawa

Yasuhiro Shimizu

Hirohide Komatsu

Shiro Ishikawa

Kimihiro Hanai

A bearing assembly includes an IC tag with information to be reliably exchanged between the IC tag and an external reader/writer, and a rolling bearing including outer and inner races and rolling elements disposed between the outer and inner races. The IC tag communicates with the external reader/writer device without contacting the reader/writer device, is attached to a metal member of the rolling bearing, includes a tag antenna, and is configured so information can be exchanged between the tag antenna and a reader/writer antenna of the reader/writer device by forming a closed magnetic circuit between the tag antenna and the reader/writer antenna. The IC tag is received in a hole in a metal member surface. The tag antenna includes at least two protrusions facing the opening of the hole and arranged so magnetic fluxes leaving/entering the protrusions pass inside the edge defining the hole opening and extend outside the hole.

Bearing assembly including IC tag

A rolling bearing as a ball bearing comprising an inner ring; an outer ring having the same axial width as said inner ring; balls arranged between said inner ring and said outer ring; and a sealing member having a roughly channel-shaped configuration in cross section projecting from both end faces of said inner ring and said outer ring. A relation between a diameter A of said ball and an axial width W of said inner ring and said outer ring satisfies A/W&#x2267;0.4, and a relation between a bearing volume V of said ball bearing and an internal space capacity C of said ball bearing satisfies 0.35&#x2266;C/V&#x2266;0.55.

Rolling bearing, spindle support structure of main motor for railway vehicle, and bearing structure

A cylindrical roller bearingcomprises an inner ring, an outer ringhaving the same axial width as the inner ringand having an insulation layerformed on an outer diameter surface and both end faces thereof, cylindrical rollersarranged between the inner ringand the outer ring, a retainerretaining intervals of the cylindrical rollers, and a sealing sealas a sealing member having a roughly channel-shaped configuration in cross section projecting from both end faces of the inner ringand the outer ring. Thus, a relation between a length Lof the rollerand an axial width Wof the inner ringand the outer ringsatisfies L/W&#x2267;0.4, and a relation between a bearing volume Vof the cylindrical roller bearingand an internal space capacity Cof the cylindrical roller bearingsatisfies 0.25&#x2266;C/V&#x2266;0.55.

A tapered roller bearing comprises inner and outer and outer rings having raceways, a large flange surface and a small flange surface, tapered rollers between the raceways and each having large and small end faces at the ends, and a retainer for the tapered rollers. The average roughness of the large end faces and the large flange surface is 0.14 &mgr;m Ra or less. The radius of curvature of the large end faces is 75 to 85% of the roller reference radius, and the central angle of the contact positions between the tapered rollers and the large flange surface is to of the roller angle. The center of the contact surface between the tapered rollers and the raceways is offset toward the large end faces from the center of the rolling surfaces of the tapered rollers by 10% or less of the effective length of the tapered rollers.

Tapered roller bearing

Growing community of inventors

Yokkaichi, Japan

Tsukasa Yamakawa