Abstract: The rolling bearing with a built-in motor includes a bearing part including an inner ring, an outer ring and a plurality of rolling elements, and a motor part including a stator and a rotor for driving and rotating the inner and outer rings of the bearing part with respect to each other. In the rolling bearing, the bearing part includes a first bearing ring having a cylindrical-shaped inner fixing portion formed in one end face of the inner ring so as to be coaxial therewith, and a second bearing ring having a cylindrical-shaped outer fixing portion formed in one end face of the outer ring so as to be coaxial therewith. When viewed in the radial direction of the rolling bearing, the stator and rotor are interposed between the inner fixing portion of the first bearing ring and the outer fixing portion of the second bearing ring.

Abstract: Into a raceway groove formed between outer and inner races, there are incorporated a plurality of rolling elements of which outside diameters serving as the rolling contact surfaces thereof each has a curvature in the axial direction as well and also each of which has a radius smaller than the radius of the raceway surfaces of the outer and inner races. The rolling elements are arranged in such a manner that the mutually adjoining rolling elements cross each other alternately and also that the outside diameters of the respective rolling elements are always contacted at two points with the raceway surfaces of one race and the raceway surfaces of the other race.

Abstract: When an information provision program is implemented, an input screen is displayed on a display section (step 101). A specific designation number is input (step 103), and one or plural bearing performance indexes are selected (step 107). When bearing performance indexes are selected, bearing service conditions which are required depending on the bearing performance indexes are input. Then, performance calculation programs corresponding to selected bearing performances are activated (steps 110-1, 110-2, . . .), and obtained calculation results are simultaneously displayed.

Abstract: A rolling bearing with sensor includes an inner ring, an outer ring, a plurality of rolling elements disposed between the inner and outer rings, and a sensor having a detecting part detecting a state of the rolling bearing and a circuit part connected to the detecting part. The detecting part and the circuit part are attached to the rolling bearing.

Abstract: Into a raceway groove 3 formed between outer and inner races 1 and 2, there are incorporated a plurality of rolling elements 5, 5 of which outside diameters 5a serving as the rolling contact surfaces thereof each has a curvature in the axial direction as well and also each of which has a radius smaller than the radius of the raceway surfaces of the outer and inner races. The rolling elements 5 are arranged in such a manner that the mutually adjoining rolling elements 5, 5 cross each other alternately and also that the outside diameters 5a, 5a of the respective rolling elements 5, 5 are always contacted at two points with the raceway surfaces 1a, 1b of one race 1 and the raceway surfaces 2b, 2a of the other race 2.

Abstract: The roller bearing 10 comprises a plurality of substantially cylindrical-shaped rollers 15 which are respectively interposed between a concave-shaped race surface 12 formed on an outer race 11 and a concave-shaped race surfaces 14 formed on an inner race 13. Each of the rollers 15 is structured such that the central portion of the rolling surface thereof is formed by a first convex-shaped bus 17 which corresponds to the concave-shaped race surfaces 12 and 14, while the two end portions of the rolling surface thereof are respectively formed by second buses 16 which have a radius of curvature smaller than the radius of curvature of the first bus 17.

Abstract: The roller bearing 10 comprises a plurality of substantially cylindrical-shaped rollers 15 which are respectively interposed between a concave shaped race surface 12 formed on an outer race 11 and a concave-shaped race surfaces 14 formed on an inner race 13. Each of the rollers 15 is structured such that the central portion of the rolling surface thereof is formed by a first convex-shaped bus 17 which corresponds to the concave-shaped race surfaces 12 and 14, while the two end portions of the rolling surface thereof are respectively formed by second buses 16 which have a radius of curvature smaller than the radius of curvature of the first bus 17.

Abstract: In the roller bearing, plural of rollers 15 are interposed between an outer raceway 11 of an outer race 12 and an inner raceway 13 of an inner race 14, and a collar portion 16 is formed along one of the axial-direction end portions of the inner raceway 13. The central portion of one of the outer race and inner raceways 11, 14 and the opposing outer peripheral surface of the roller 15 is formed of a first bus with a given radius of curvature. The two end portion sides adjacent to the central portion are formed of a second bus with such a radius of curvature that causes the two end portion sides to part away from the other. The collar surface 19 of the collar portion 16 contacting with an end face of the roller 15 being a convex-shaped spherical surface is formed as a concave-shaped spherical surface.

Abstract: At least the center portion of the contour of a rolling surface of each roller along the direction of an axis is linearly shaped in parallel with the axis, and each of the inclinations of the surface on a pillar side of a pocket of a cage for receiving rollers with respect to the circumferential and radial directions is set to be equal to or less than {fraction (1.5/1000)} as large as the length of the roller.

Abstract: A roller bearing comprising an outer ring having an outer ring raceway, an inner ring having an inner ring raceway, the inner peripheral surface at the end portion of the outer ring and/or the outer peripheral surface at the end portion of the inner ring formed with a flange portion, and a plurality of rollers having a rolling surface in contact with the outer and inner ring raceways, a sliding contact face in sliding contact with the inner face of the flange portion, and a chamfered portion provided between the sliding contact face and the rolling face, the sliding contact face smoothly connected to the chamfered portion in a curved surface the radius of curvature of which is at least 0.08 mm, and provided that the center line average height roughness of the sliding contact surface is .delta..sub.1 while the center line average height roughness of the inner face in contact with the sliding surface is .delta..sub.2, the composite roughness represented by the formula (.delta..sub.1.sup.2 +.delta..sub.2.sup.2).

Abstract: A sphere is supported in a floating condition by a pneumatic bearing so as to be rotated by compressed air sprayed from a nozzle. The sphere has a single point magnetized on its surface, and is placed on its rotating axis. If the sphere has a dynamic imbalance, the single point is subjected to pressesion around its inertia axis, the locus and displacement velocity of which are measured by the Hall elements arranged in an arc line around the pneumatic bearing, thereby obtaining the dynamic imbalance of the share.

Abstract: 1. A ball bearing comprising; a first race ring having a surface formed with a first race surface thereon, a second race ring having a surface formed with a second race surface thereon, and a plurality of balls provided so as to be freely rotatable between the first race surface and the second race surface, the ball bearing being used under conditions wherein a product d.sub.m .multidot.N of a pitch circle diameter d.sub.m mm of the plurality of balls, and a rotational speed N rpm of the second race ring relative to the first race ring is greater than 1,000,000 mm.multidot.rpm, characterized in that for each of the plurality of balls, a ratio .DELTA.I/I of a dynamic imbalance amount to a moment of inertia I, is less than (3.1.times.10.sup.7 /(d.sub.m .multidot.N).sup.2)+2.7.times.10.sup.-5.

Abstract: A displacement detecting apparatus for detecting a displacement between an object lens thereof and a measured surface in a non-contact manner. The displacement detecting apparatus comprises an object lens for focusing laser beam on the measured surface. A detecting optical system is provided to detect a focus error signal which represents a difference between a distance of the object lens from the measured surface and a focal distance of the object lens, in accordance with a reflected light from the measured surface. An actuator is provided to move the object lens in an optical axis in a manner to cause the object lens distance to coincide with the focal distance, in accordance with an output signal from the detecting optical system. A moving body includes a linear scale or a scale head and movable with the object lens. The linear scale is disposed coaxially with the optical axis and connected to the actuator. A support member is provided to movably support the moving body.

Abstract: A rolling bearing for supporting a rotating shaft of a high speed rotating machine is provided with an outer race including an outer raceway on an inner face thereof, an inner race including an inner raceway on an outer face thereof, the inner race being rotated together with the rotating shaft, a plurality of rolling elements rotatably disposed between the outer raceway and the inner raceway, and a hole formed at a portion of the inner race, in which a section of the hole in a circumferential direction of the inner race has a shape of which a size in the circumferential direction of the inner race is greater than that in an axial direction of the inner race, and which are free from a sharp edge. The rolling bearing can relax stress concentration produced in the inner race during a high speed rotation and can increase the allowable rotation speed of the inner race.