A parallel link mechanism includes a proximal end side link hub; a distal end side link hub; and three or more link mechanisms that connect the distal end side link hub to the proximal end side link hub in a position-changeable fashion. Each of the link mechanisms has a trinodal structure. Each revolute pair of each of the link mechanisms includes one pair of pair constituent members connected to each other via a bearing. One of the pair constituent members is formed with a shaft portion fitted to an inner periphery of an inner ring of the bearing, and the other of the pair constituent members is formed with an annular inner face forming portion fitted to an outer periphery of an outer ring of the bearing.

An internal meshing planetary gear apparatus and a robotic joint device. The internal meshing planetary gear apparatus includes an internally toothed gear, a planetary gear, a plurality of inner pins, an eccentric shaft which acts as an input shaft, and a bushing. The plurality of inner pins is respectively inserted into a plurality of inner pin holes formed in the planetary gear, and is configured to revolve in the inner pin holes while rotating relative to the internally toothed gear about a rotation axis. The eccentric shaft is configured to cause the planetary gear to oscillate eccentrically. The bushing includes a fixing structure configured to fix an object member, and the bushing is combined with the eccentric shaft and configured to rotate together with the eccentric shaft.

A sensorized roller for a rolling bearing includes a roller body having an axial length and a bore that extends axial through the roller body and a housing in the roller bore. The housing includes a central sensing module having an axial length and at least one sensor in the central sensing module configured to measure at least one parameter related to a condition of the sensorized roller, an antenna module having an axial length that is secured to a first axial end of the central sensing module and a power module having an axial length that is secured to a second axial end of the central sensing module.

Provided is an in-wheel motor drive device, including a casing configured to hold a motor part, a speed reduction part, and a wheel bearing part, the motor part including; a stator, which is fixed to the casing; a rotation shaft of a motor, which is rotatably supported on the casing through intermediation of rolling bearings; and a rotor, which is mounted to the rotation shaft of the motor. The rolling bearing has a radial internal clearance of from 8 m to 25 m before being mounted into the motor part. The rotation shaft of the motor is rotatably supported on the casing through intermediation of a plurality of rolling bearings. The rotation shaft of the motor and the rolling bearings configured to support the rotation shaft of the motor are fitted to each other by transition fit or interference fit.

The present invention provides a tapered roller bearing used in a planetary gear speed reducer, and including an outer race, and a retainer formed with a first annular portion, a second annular portion, and pillars. At least one retainer guiding surface (raceway) which guides the retainer in the radial direction is formed only on the inner periphery of the outer race. Guided surfaces are formed at least either on the pillars or on the first and second annular portions, and guided by the at least one retainer guiding surface. Therefore, it is possible to guide the axial central portion or both side portions of the retainer, to make the retainer less likely to tilt due to a centrifugal force, and to apply a preload to both side surfaces of the outer race.

The present invention relates to a flywheel apparatus for energy storage and recovery including a housing within which there is a chamber in which a flywheel on a shaft rotates. The chamber is evacuated to at or near vacuum pressure, so that air resistance-related energy losses of the flywheel as it rotates are reduced. Maintaining near-vacuum pressure within the chamber requires an effective seal between the housing and the shaft. The effective seal must be maintained despite any relative movement (in particular translational movement) of the flywheel and the housing. To this end, the shaft is mounted via a bearing arrangement on a carrier on which is also mounted a sealing arrangement. The carrier is mounted on the housing such that the carrier, the bearing arrangement and the sealing arrangement move substantially together relative to the housing.

The present invention relates to a flywheel apparatus for energy storage and recovery including a flywheel system coupled to a flywheel drive system. The flywheel system includes a housing with a chamber in which a flywheel on a shaft rotates. The shaft is mounted on the housing via at least one damper which may allow but constrain and/or damp movement of the flywheel and shaft relative to the housing. The flywheel system has a flywheel lubrication system. The flywheel drive system may have a different type of fluid from the flywheel system. The two fluids may be kept separate by a sealing arrangement. Movement of the flywheel shaft relative to the housing is accommodated by a link member which allows the flywheel shaft to move relative to the housing. The link member also prevents the sealing arrangement from becoming damaged or becoming ineffective, and may also act as a mechanical fuse.

A rolling-element bearing unit for a wheel bearing assembly of a vehicle includes a rolling-element bearing with an outer ring, a an inner ring, a bearing interior between the outer ring and the inner ring and a plurality of rolling elements in the bearing interior. The inner ring has an inner ring surface facing the bearing interior and a first and a second axial end surface. A first seal assembly includes a retainer fixed on the bearing outer ring and a seal element configured to slidingly seal against the bearing inner ring surface or against a slip sleeve carried by the bearing inner ring. The retainer is an angle bracket having an axially extending annular leg and a radially inwardly extending annular flange, and radially inwardly extending flange projects radially inwardly beyond the bearing inner ring surface, for example, over a step in the first axial end surface.

An oil sealing device for preventing a leakage of an oil of a bearing which supports a rotary shaft of a rotating machine has a brush member having a plurality of bristles in contact with the rotary shaft, and an actuator configured to move the brush member in a length direction of the rotary shaft, wherein a sloped surface having different heights along a length direction of the rotary shaft is formed at the rotary shaft, and wherein when the bristles are worn, the actuator moves the brush member in a length direction of the rotary shaft so that the bristles comes into contact with the sloped surface.

An assembly method for a planetary roller speed changer is provided. The planetary roller speed changer includes a plurality of planetary rollers that is in rolling contact with both an input shaft and a fixed ring and an output shaft supported by a housing and rotating along with the planetary rollers. An assembly apparatus includes an adjustment apparatus that enables positions of the fixed ring and the housing to be adjusted and a measurement apparatus that measures irregularity of rotation of the output shaft. In an assembly step, the fixed ring and the housing are fixed at a position where the irregularity of rotation of the output shaft is minimized.