Ntn Corporation

Naoaki Tsuji

Hideji Ito

Katsunori Sone

Hikaru Ishida

Tsukasa Yamakawa

Yoshinori Ito

Fuminori Satoji

Kouya Oohira

Hideyuki Tsutsui

Yoji Sato

Takahiro Gotou

Hisanori Aiga

Chiharu Ito

Hiroki Manabe

Miki Arihana

A ball bearing is provided which includes inner and outer races each having a raceway groove; balls; and a retainer made of a synthetic resin, and in which abnormal noise is reduced. Either the raceway groove of the inner race, or each of the raceway grooves of the inner race and the outer race has a radius of curvature which is 104% or more and 109% or less of the radius of each of the balls.

Ball bearing

A synthetic resin retainer includes two annular members having opposed surfaces opposed to each other and each formed with a plurality of pockets which are circumferentially spaced apart from each other, and in which the balls are received. Each annular member includes axially concave, arc-shaped pocket wall portions defining the inner surfaces of the pockets, and flat plate-shaped coupling plate portions coupling together the adjacent pairs of the pocket wall portions. The coupling plate portions have axial thicknesses of 30% or less of the diameters of the balls, and the pocket wall portions have, at deepest points of the pockets, thicknesses of 10% or less of the diameters of the balls.

Synthetic resin retainer and ball bearing

A separatorincluding a solid lubricant is disposed between adjacent rolling elements. Relative movement of the adjacent rolling elementsand the separatorin a direction of separating apart in a circumferential direction is restricted by restricting members, and the restricting membersare disposed at plural locations in the circumferential direction. A minute gap &#x3b1; is provided between the adjacent restricting members, to allow relative movement therebetween. This can provide a solid-lubrication rolling bearing capable of stably preventing rotational locking and unintended disassembling of the bearing for a long period.

Solid-lubrication rolling bearing

A rolling bearing which is capable of preventing the rolling elements from dropping out from between the inner and the outer rings even when the separators have been worn to an advanced stage. A rolling bearing includes: a plurality of rolling elements arranged between an inner and an outer rings; and a plurality of prismatic separators disposed in a circumferential direction between the rolling elements. The separator includes integrally therewith a metal band on at least one of its outer surfaces including those which face the inner or the outer ring, or at least one of its axial side surfaces, excluding however, surfaces which face the circumferential direction and make contact with the rolling elements. The metal band has a narrower width than a width of the separator in the circumferential direction, and prevents wear of the separator from advancing beyond a certain extent.

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.

Growing community of inventors

Kuwana, Japan

Naoaki Tsuji