Nsk Corporation

Yoshio Shoda

Tetsuo Unno

Shigeru Endo

Ikunori Sakatani

Kouichi Morita

Takeshi Takizawa

Tomoyuki Yanagisawa

Hiromasa Fukuyama

Seiji Ijuin

Jun Liu

Toshio Takahashi

Takashi Yoshida

Takashi Murai

Yukio Sato

Hirotoshi Aramaki

Shinichi Natsumeda

Tetsu Takehara

Tatsunobu Momono

Katsuhiro Konno

Hideo Okano

Morio Sorimachi

The wireless sensor adds identification information peculiar to respective sensor modules to detection data of vibration, temperature, and soon, detected by the sensor modules respectively. The wireless sensor transmits the detection data with the identification information as a signal through a communication unit by radio waves. On the other hand, the management apparatus receiving the signal classifies and files the detection data on the basis of the identification information included in the signal. Then, the monitoring system is designed to make the management apparatus manage a plurality of wireless sensors attached to movable shafts of processing machines or the like.

Wireless sensor, rolling bearing with sensor, management apparatus and monitoring system

The wireless sensor adds identification information peculiar to respective sensor modules to detection data of vibration, temperature, and so on, detected by the sensor modules respectively. The wireless sensor transmits the detection data with the identification information as a signal through a communication unit by radio waves. On the other hand, the management apparatus receiving the signal classifies and files the detection data on the basis of the identification information included in the signal. Then, the monitoring system is designed to make the management apparatus manage a plurality of wireless sensors attached to movable shafts of processing machines or the like.

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.

Rolling bearing with built-in motor

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.

Rolling bearing device and ring with sensor for the rolling bearing device

When an information provision program is implemented, an input screen is displayed on a display section (step ). A specific designation number is input (step ), and one or plural bearing performance indexes are selected (step ). 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 - - , . . .), and obtained calculation results are simultaneously displayed.

Method and system for providing performance index information of a machine element, and method and system for supporting selection of a machine element

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

Roller bearing

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.

Rolling bearing and rolling bearing device

In the roller bearing, plural of rollers are interposed between an outer raceway of an outer race and an inner raceway of an inner race and a collar portion is formed along one of the axial-direction end portions of the inner raceway The central portion of one of the outer race and inner raceways and the opposing outer peripheral surface of the roller 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 of the collar portion contacting with an end face of the roller being a convex-shaped spherical surface is formed as a concave-shaped spherical surface.

Into a raceway groove formed between outer and inner races and , 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

Rolling bearing

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

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.

Cylindrical roller bearing

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).sup.1/2 is up to 0.09 .mu.mRa.

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.

Method and apparatus for measuring dynamic imbalance of sphere

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.

Ball bearing with controlled dynamic imbalance

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.

Growing community of inventors

Kanagawa, Japan

Yoshio Shoda