Ntn Corporation

Ntn Toyo Bearing Co., Ltd.

Hideji Ito

Naoaki Tsuji

Katsunori Sone

Tsukasa Yamakawa

Yukihisa Tsumori

Kosuke Inukai

Koji Kametaka

Yukihiro Kataoka

Kiyoshi Sato

A cylindrical roller bearing assembly capable of increasing the load bearing capability with respect to the thrust load and of easily controlling the shape of the cylindrical roller is provided. The cylindrical roller bearing assembly includes an inner ring, an outer ring and a plurality of cylindrical rollers. One or both of the inner and outer rings has/have a collar. A surface portion encompassed within the region of radial dimensions of 0.12 Da to 0.20 Da as measured from an outer diametric edge of an end face of each of the cylindrical rollers to a roller axis, wherein Da represents an outer diameter of each of the cylindrical rollers is rendered to be a crowned portion of a tapered shape inclined at an angle &#x3b8;r of 0.25 to 1&#xb0; relative to a plane perpendicular to the roller axis.

Cylindrical roller bearing

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.

To provide an improved rolling bearing assembly having an improved resistance to electric corrosion, which can provide a proper performance and can be assembled at a reduced cost, the rolling bearing assembly includes an inner race (), an outer race () and a circumferential of rolling elements () rollingly interposed between the inner and outer races () and (). An electrically insulating layer () is formed on a surface of one of the inner and outer races () and (), which is held in contact with a housing or a shaft when the rolling bearing assembly is mounted. This electrically insulating layer () is made of a gray alumina containing AlOmixed with TiOin a quantity chosen to be equal to or smaller than 1 wt % relative to the total weight of the gray alumina.

Rolling bearing assembly having an improved resistance to electric corrosion

To provide an electrocorrosion preventive rolling bearing assembly wherein a final machining of an electrically insulating layer and a thickness control of the insulating layer can easily and accurately be accomplished, the electrocorrosion preventive rolling bearing assembly is of a type in which an inner race () or an outer race () is formed with an insulating layer () so as to cover a peripheral surface thereof, which engages a housing or a shaft, and opposite annular end faces thereof. The insulating layer () is a thermally sprayed layer of a metallic oxide. Of the inner and outer races () and (), a raceway member having the insulating layer () is provided at its end face with a tool reference plane () for a process of finishing the electrically insulating layer () or for the thickness control of the insulating layer. This tool reference plane () may be either an indented radial surface of a step () formed in the end face or a bare portion of the end face that is left uncovered by the insulating layer ().

Growing community of inventors

Kuwana, Japan

Hideji Ito