A rolling bearing according to an embodiment includes a stationary ring having a first facing surface, a rotating ring having a second facing surface facing the first facing surface, and rotating relative to the stationary ring, rolling elements arranged between the first facing surface and the second facing surface, a cage that retains the rolling elements, first electrodes and second electrodes fixed in position relative to the stationary ring and arranged in a bearing space between the stationary ring and the rotating ring, third electrodes fixed in position relative to the rotating ring, position relative to the rolling elements, or position relative to the cage and arranged in the bearing space, and an insulating film formed on surfaces of the first electrodes and the second electrodes or surfaces of the third electrodes.

A rolling bearing unit includes: an inner ring member having a recess on a first side in an axial direction, the recess being recessed toward a second side in the axial direction; an outer ring member disposed on the outer periphery side of the inner ring member; a rolling body disposed between the inner ring member and the outer ring member and rotatably supporting the inner ring member with respect to the outer ring member; a transmitter capable of transmitting at least one of electric power or a signal, at least a part of the transmitter being accommodated inside the recess of the inner ring member; and a covering member that is supported by the first side of the outer ring member in the axial direction, covers the first side of the inner ring member in the axial direction, and fixes the transmitter.

An aircraft gas turbine engine (10) comprises a main engine spool (22) and a bearing arrangement (36) configured to rotatably support the main engine spool (22). The bearing arrangement (36) includes a damper (41) comprising a static element (42) and a moveable element (39). The gas turbine engine further comprises an electric machine (30) comprising a rotor (34) and a stator (32). The rotor (34) is mounted to the main engine spool (22), and the stator (32) is mounted to the moveable element (39) of the damper to be moveable with the moveable element (39).

A rolling element for use in a rolling-element bearing is proposed, including an outer casing and a bore hole. The bore hole is provided along a center line of the rolling element. The rolling element has at least one sensor arranged in the bore hole for load measurement and a radio module for transmitting the data measured by the sensor, wherein the rolling element has a micro-generator to provide the energy required for operation of the sensor and/or of the radio module.

A bearing assembly for supporting a drive shaft of an electric drive motor includes at least one inner ring, at least one outer ring, and a plurality of rolling elements disposed between the inner ring and the outer ring. The bearing assembly is an angular contact ball bearing, and the plurality of rolling elements include a first row of rolling elements and a second row of rolling elements. Also a shaft assembly supported by the bearing assembly and an electric motor including the shaft assembly.

A fixing structure for an auxiliary bearing of an electric drive assembly and an electric drive assembly are disclosed. The fixing structure comprises a bearing pressing plate, a bolt, a lock nut, an auxiliary bearing outer ring and an auxiliary bearing inner ring. The bearing pressing plate is provided with a through hole, the housing is provided with a threaded hole, and the bolt passes through the through hole and is fixed in the threaded hole. The bearing pressing plate pre-tightens one side of the auxiliary bearing outer ring, and the housing limits a position of the other side of the auxiliary bearing outer ring. The lock nut is sleeved on the shaft to pre-tighten one side of the auxiliary bearing inner ring, and the gear limits a position of the other side of the auxiliary bearing inner ring. The bearing fixing solution has a simple structure; moreover, the inner and outer rings of the bearing are pre-tightened by threads, thereby avoiding over-positioning of the bearing, reducing the running noise of the bearing, and improving the service life of bearing.

A rolling bearing unit includes: an inner ring member having a recess on a first side in an axial direction, the recess being recessed toward a second side in the axial direction; an outer ring member disposed on the outer periphery side of the inner ring member; a rolling body disposed between the inner ring member and the outer ring member and rotatably supporting the inner ring member with respect to the outer ring member; a transmitter capable of transmitting at least one of electric power or a signal, at least a part of the transmitter being accommodated inside the recess of the inner ring member; and a covering member that is supported by the first side of the outer ring member in the axial direction, covers the first side of the inner ring member in the axial direction, and fixes the transmitter.

A sensorized roller for a bearing includes a bore that extends through the roller, a sensor for measuring at least one physical state of the roller bore and producing a first signal indicative of the measured physical state, a wireless transmitter for receiving the first signal from the sensor and wirelessly transmitting a second signal based on the first signal, and a generator configured to be rotated by a movement of the roller, the generator being electrically connected to the sensor. The measuring unit, the wireless transmitter and the generator are located inside the bore.

A bearing equipped with a sensor and incorporating a power generation function in a simple configuration is provided. A bearing includes an outer ring, a plurality of rolling elements, an inner ring, a cage, a seal member, a sensor, a transmission unit, and a power generation unit. The sensor is disposed in the seal member, and detects state information of the bearing. The transmission unit transmits the state information detected by the sensor to outside. The power generation unit is disposed so as to face a bearing space sandwiched between the outer ring and the inner ring, and generates electric power that is to be supplied to the sensor and the transmission unit. The power generation unit includes an element that converts stress into electromotive force.

A sliding bearing assembly includes at least one sliding bearing element which is arranged in a bearing receptacle that is part of a bearing structure having at least one sensor connected to a data transmission device for data transmission to a receiver of the data, and to an energy generating device. The energy generating device supplies the sensor and/or the data transmission device with electrical energy in a self-sufficient manner, and may include a piezo element which is pretensioned under pressure. In some embodiments, the energy generating device is the sensor.