NTN Patente

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Provided are a sealing device capable of achieving both low torque and high sealability by improving grease applied to a seal lip and a mating member thereof, and a rotating component using the sealing device. A seal ring 14 is fixed to a fixed-side member 2 of a rotating component, is in sliding contact with a rotating-side member 15, and has a seal lip in sliding contact with the rotating-side member 15, grease being applied to a sliding contact surface of the seal lip, in which the grease contains a base oil, a thickener, and an additive, and an apparent viscosity of the grease at a shear rate of 1000 s^-1 at 60°C is 0.22 Pa·s or more.

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A first mathematical formula is prepared that allows a decision to be made about a rolling bearing (10) including an inner ring (11), an outer ring (12), a plurality of rolling elements (13), and a lubricant (LQ). It is decided according to use conditions for the rolling bearing (10) whether or not a first mathematical formula satisfies a second mathematical formula, the first mathematical formula being expressed as: F=fαβγδ the second mathematical formula being expressed as: F≤10 When calculating a parameter for the lubricant (LQ), the lubricant (LQ) is divided into a first region and a second region. A characteristic value of an imaginary element assumed for the first and second regions in an imaginary electric circuit corresponding to the rolling bearing (10) is obtained.

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A rolling bearing 1 includes raceway surfaces 11a and 12a and a rolling element 13 that rolls on the raceway surfaces. The rolling bearing 1 includes: a contact portion where the raceway surface and the rolling element are in point contact with each other, an oil film is formed at a portion of the point contact, and the raceway surfaces 11a and 12a are in contact with the rolling element 13; and a non-contact portion that is not in contact with the rolling element. An estimated value Fr,w of rolling viscosity resistance is calculated from a regression equation, in which a calculation range of a contact ellipse in a major axis direction is set to a length selected within a range exceeding a major axis radius of the contact ellipse and equal to or less than an axial equivalent radius.

A collecting pin (141) having a hollowed shape and capable of cutting out and collecting a material to be treated, a disposing pin (142) that comes into contact with the material in the collecting pin (141) and pushes the material to dispose the material outside the collecting pin (141), and a fixing holder (143) to which the collecting pin (141) is fixed, are comprised. The material to be treated is a gel sheet, which is a gel formed into a sheet and supporting a target to be collected.

The present invention addresses the problem of suppressing movement of a slinger in an axial direction regardless of the resultant axial length of a cylindrical part of the slinger. An outer-side seal member (10) of a wheel bearing device (1) comprises: a slinger (13) that is provided to a base part (3d) of a hub flange (3b) and that has a cylindrical part (13a) which fits into an outer peripheral surface (3j) of a hub ring (3) and a disk part (13b) which faces the hub flange (3b); and a seal member (12) that has a seal lip. The outer peripheral surface (3j) of the hub ring (3) has a fitting part (31) into which the cylindrical part (13a) of the slinger (13) fits. The fitting part (31) has a small-diameter section (311) and a large-diameter section (312) that is positioned farther from the hub flange (3b) than the small-diameter section (311) in the axial direction and that is formed to have a diameter larger than that of the small-diameter section (311).

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A rolling bearing (100) supports a rotation shaft of a vehicle drive unit. The rolling bearing includes an inner ring (10), an outer ring (20), and a rolling element (30) which are made of steel subjected to quenching and tempering. Each of the inner ring, the outer ring, and the rolling element has a rolling surface (10da, 20ca, 30a). A dislocation density of retained austenite at a rolling surface superficial layer of at least one of the inner ring and the outer ring is 2.5×10¹⁴ m^-2 or more and 1.0×10¹⁷ m^-2 or less.