An arrangement of concentric, independently rotating shafts for a rotating gear train system is disclosed. The arrangement may include an inner shaft, the inner shaft operatively couplet to a rotating element, and an outer shaft, the outer shaft concentric with the inner shaft and arranged radially outward from the inner shaft. The arrangement may further include a first bearing stack, the first bearing stack arranged radially outward from the inner shaft and including at least one preloaded ball bearing and a second bearing stack, the second bearing stack arranged radially outward from the outer shaft and comprising at least one ball bearing. The arrangement may include a bearing stack retainer, the bearing stack retainer mating with the first and second bearing stacks to hold the first and second bearing stacks in position with respect to the inner and outer shafts and the bearing stack retainer coupled with and rotating with the outer shaft.

A bearing assembly and a rotary shaft apparatus employing the same are provided. The bearing assembly is rotatably coupled with a first shaft and a second shaft. The first bearing housing includes a first annular recess having a first axial depth. The first bearing is connected with the first annular recess and the first shaft and has a first axial thickness. The second bearing housing includes a second annular recess having a second axial depth. The second bearing is connected with the first annular recess, the second annular recess and the second shaft and has a second axial thickness. The spacer is disposed between the first bearing and the second bearing and has a third axial thickness. The sum of the first axial thickness, the second axial thickness and the third axial thickness is greater than the sum of the first axial depth and the second axial depth.

A system for monitoring the health of one or more bearings of a journal assembly is provided. The system includes a split spacer, one or more vibration sensors, a speed sensor, and a controller. The split spacer is configured to be disposed on a shaft of the journal assembly, the shaft is configured to support the bearings. The vibration sensors are configured to detect vibrations emitted by the bearings. The speed sensor is configured to measure the rotational speed of the bearings. The controller is configured to electronically communicate with the vibration sensors and the speed sensor and calculate a health status of the bearings. The split spacer includes two portions that define a cavity configured to abut the shaft so as to allow the vibration sensors to be disposed inside the split spacer and next to the one or more bearings.

The invention is directed to a wind power plant having a rotor mounted rotatably about an axis directed approximately in the wind direction, and having at least two mutually concentric annular elements for connection to oppositely rotatable system components of the wind power plant, one of which comprises means for connection to the rotor of the wind power plant or to a drive shaft of a gearbox coupled thereto; at least one element having a freewheel characteristic is disposed between the two connection elements and together with them forms a freewheel, at least one connection element being provided with at least one integrated raceway for a row of rolling bodies rolling thereon.

A drivetrain system includes a first drive gear driven by a first motor and a second drive gear driven by a second motor. The first drive gear and the second drive gear are arranged along the axis. The first drive gear includes a first extension and the second drive gear includes a second extension arranged radially within and axially overlapping the first extension. The drivetrain system includes a system of bearings arranged between the first drive gear and the second drive gear, either drive gear and a stationary component, or a combination thereof. In some embodiments, the drivetrain system includes a clutch assembly arranged between the first drive gear and the second drive gear that interfaces to the first drive gear and to the second drive gear. The clutch assembly allows the drive gears to be locked or otherwise engaged to improve torque transfer.

The present invention relates to a device (1) for monitoring the degradation of rolling bearings (15a, 15b) in a rotating machine (10) comprising at least two rolling bearings (15a, 15b) each having two concentric rings (16-18) rotating relative to each other, at least one ring (17, 18) of each bearing (15a) being rotationally connected to a ring (17, 18) of another bearing (15b). The device (1) comprises a member (30) for measuring the speed of rotation (ω.sub.1) of the rotationally connected rings (17, 18), and data processing means suitable for detecting a variation in the speed of rotation (ω.sub.1) of the rotationally connected rings (17, 18), which variation is representative of degradation of a bearing (15).

A motor includes a rotor having a rotation shaft, a stator arranged oppositely in a circumferential direction of the rotor, and a pair of bearing portions rotatably supporting the rotation shaft, the pair of bearing portions each include a first bearing being rotatable together with the rotation shaft and a second bearing being rotatable together with the first bearing, the first bearing rotates together with the rotation shaft when the first bearing is normal, and the second bearing as well as the first bearing rotates together with the rotation shaft when the first bearing is abnormal.

A motor includes a rotor having a rotation shaft, a stator arranged oppositely in a circumferential direction of the rotor, and a pair of bearing portions rotatably supporting the rotation shaft, the pair of bearing portions each include a first bearing being rotatable together with the rotation shaft and a second bearing being rotatable together with the first bearing, the first bearing rotates together with the rotation shaft when the first bearing is normal, and the second bearing as well as the first bearing rotates together with the rotation shaft when the first bearing is abnormal.

A double row axial roller bearing assembly includes a compressible ring between the two rows. This compressible ring prevents excessive axial forces if the respective shafts impact one another after becoming axially separated. One embodiment is fully unitized such that all parts of the bearing assembly remain with one of the two shafts if the shafts become axially separated. Another embodiment is semi-unitized such that one row of rollers and the compressible ring remain with one of the shafts while the other row of rollers remains with the other shaft. In both cases, all bearing components are prevented from falling out of position such that they return to their proper axial and radial position when the shafts come back together.

Systems and methods are provided for a compound bearing assembly including an offset coupler supporting an inner bearing and an outer bearing for distributing a rotational loading of the compound bearing assembly. In some embodiments, at least one of the bearings comprises a bearing cage with a plurality of elongated openings for receiving a respective plurality of balls. The compound bearing assembly is configured to support a drive shaft of a supercharger system of a vehicle or some other rotational system.