Abstract: A compressor according to an embodiment includes: a rotational shaft provided with a compressor impeller on one end side; a rolling bearing device for rotatably supporting the rotational shaft; and a housing for housing the rolling bearing device. The rolling bearing device includes: an inner ring mounted on the rotational shaft; an outer ring supported by the housing with application of a load from the housing in an axial direction of the rotational shaft; a rolling element disposed between the inner ring and the outer ring; an elastic member disposed on an outer circumferential side of the outer ring so as to come into contact with the housing; and a sliding portion disposed on one end side of the outer ring in the axial direction so as to come into contact with the housing.

Abstract: A gas bearing device is a gas bearing device using a gas as a working fluid, including: a rotational shaft; a housing where the rotational shaft penetrates; an annular top foil disposed inside the housing and surrounding an outer periphery of the rotational shaft; a back spring disposed between the top foil and the housing, and having a plurality of crests contacting the top foil and a plurality of valleys contacting the housing; and a pair of snap rings fitted in shaft holes where the rotational shaft of the housing penetrates, and configured to restrict movement of the back spring in an axial direction of the rotational shaft. The gas bearing device has a turning groove inclined with respect to an axis of the rotational shaft, in at least one of the pair of snap rings or in a region of the rotational shaft facing at least one of the pair of snap rings.

Abstract: A gas bearing device is a gas bearing device for rotatably supporting a rotational shaft by using a gas as a working fluid, including: a housing where the rotational shaft penetrates; an annular top foil disposed inside the housing and surrounding an outer periphery of the rotational shaft; a back spring disposed between the top foil and the housing, and having a plurality of crests contacting the top foil and a plurality of valleys contacting the housing; and a pair of snap rings fitted in shaft holes where the rotational shaft of the housing penetrates, and configured to restrict movement of the back spring in an axial direction of the rotational shaft. An inner peripheral surface of each of the pair of snap rings has self-lubricating properties.

Abstract: An electric centrifugal compressor includes: an electric motor including a rotational shaft; a first impeller disposed on one end side of the rotational shaft; a first bearing rotatably supporting the rotational shaft at a position between the first impeller and the electric motor and including a lubricant; and a first bearing housing accommodating the first bearing, The first bearing housing includes a compressed gas supply hole for supplying a compressed gas from outside of the first bearing housing to a gap between a rotating body including the rotational shaft and the first bearing housing. An outlet of the compressed gas supply hole is disposed on an inner surface of the first bearing housing and is located between the first impeller and the first bearing in an axial direction of the rotational shaft.

Abstract: This rotary machine is provided with: a rotor shaft; a compressor connected to the rotor shaft; a rotor connected to the rotor shaft on the upstream side, from the compressor, of the air-flow flowing to the compressor; a stator disposed so as to have a space from the outer circumferential part of the rotor; and a cover that covers the upstream side of the air-flow in the space between the stator and the rotor and that has an opening formed so as to connect the space with the upstream side, from the space, of the air-flow.

Abstract: With an electric compressor including a rotational shaft, a compressor wheel disposed on the rotational shaft, and an electric motor for applying a rotational force to the rotational shaft including a rotor fixed to the rotational shaft, and a stator disposed around the rotor, for applying the rotational force to the rotor by an electromagnetic force, a vibration/noise reduction device includes a detector for detecting a frequency related to a vibration of the stator, and a signal generator for generating a vibration signal that has a frequency of a predetermined integral multiple of an electrical angle frequency, which is obtained from the frequency detected by the detector, and has a signal wave attenuating the vibration of the stator, and a vibrator for vibrating the electric compressor based on the vibration signal.

Abstract: A multi-stage electric centrifugal compressor configured to drive impellers disposed at both ends of a rotational shaft by an electric motor includes: the rotational shaft; a low-pressure-stage impeller disposed at one end of the rotational shaft; a high-pressure-stage impeller disposed at the other end of the rotational shaft; a high-pressure-stage housing accommodating the high-pressure-stage impeller; and a connecting pipe for supplying a compressed gas compressed by the low-pressure-stage impeller to the high-pressure-stage housing. The high-pressure-stage housing has a high-pressure-stage inlet opening that opens in a direction intersecting an axis of the rotational shaft. The connecting pipe includes a high-pressure-stage-side connection portion connected to the high-pressure-stage inlet opening.

Abstract: A rotary electric machine includes a housing, a stator disposed in the housing, and at least two support members disposed in at least two different parts, respectively, in an axial direction of the stator between the housing and an outer circumferential surface of the stator, the at least two support members supporting the stator against the housing. The at least two support members, the housing, and the outer circumferential surface of the stator form a space.

Abstract: A rotary electrical machine includes a housing which includes a flow passage portion in which a refrigerant flow passage through which a refrigerant flows is formed and which houses a rotor and a stator. The refrigerant flow passage includes a first flow passage of which a length from the inlet to the outlet in the circumferential direction is a predetermined length, and a second flow passage of which a length from the inlet to the outlet in the circumferential direction is shorter than that of the first flow passage. The second flow passage is provided with a partition wall portion between the inner peripheral wall and the outer peripheral wall in the radial direction. A slit penetrating the partition wall portion in the circumferential direction is formed in the partition wall portion. A width of the slit is smaller than a width of the first flow passage.

Abstract: A compressor according to an embodiment includes: a rotational shaft provided with a compressor impeller on one end side; a rolling bearing device for rotatably supporting the rotational shaft; and a housing for housing the rolling bearing device. The rolling bearing device includes: an inner ring mounted on the rotational shaft; an outer ring supported by the housing with application of a load from the housing in an axial direction of the rotational shaft; a rolling element disposed between the inner ring and the outer ring; an elastic member disposed on an outer circumferential side of the outer ring so as to come into contact with the housing; and a sliding portion disposed on one end side of the outer ring in the axial direction so as to come into contact with the housing.

Abstract: A motor assembling method for an electric motor includes inserting a stator of the motor into a first housing of the motor through an opening of the first housing; fitting a shaft portion of a centering jig to an inner peripheral surface of the stator and a mounting portion of a first bearing of the motor in the first housing, and fitting a flange portion to the opening; fixing the stator on which centering is performed using the centering jig to the first housing; removing the centering jig from the first housing; and inserting a rotary shaft of the motor, the first bearing, and a second bearing of the motor into the first housing, and fixing a second housing of the motor to the opening.

Abstract: With an electric compressor including a rotational shaft, a compressor wheel disposed on the rotational shaft, and an electric motor for applying a rotational force to the rotational shaft including a rotor fixed to the rotational shaft, and a stator disposed around the rotor, for applying the rotational force to the rotor by an electromagnetic force, a vibration/noise reduction device includes a detector for detecting a frequency related to a vibration of the stator, and a signal generator for generating a vibration signal that has a frequency of a predetermined integral multiple of an electrical angle frequency, which is obtained from the frequency detected by the detector, and has a signal wave attenuating the vibration of the stator, and a vibrator for vibrating the electric compressor based on the vibration signal.

Abstract: A rotary electric machine includes a housing, a stator disposed in the housing, and at least two support members disposed in at least two different parts, respectively, in an axial direction of the stator between the housing and an outer circumferential surface of the stator, the at least two support members supporting the stator against the housing. The at least two support members, the housing, and the outer circumferential surface of the stator form a space.

Abstract: An electric supercharger includes: a compressor impeller; a motor configured to transmit a driving force to the compressor impeller via a rotational shaft; a back-surface side casing facing a back surface of the compressor impeller via a gap and surrounding the rotational shaft; a bearing disposed between the back-surface side casing and the rotational shaft so as to support the rotational shaft rotatably; and a mechanical seal positioned between the back surface of the compressor impeller and the bearing in an axial direction of the compressor impeller and configured to seal a gap between the rotational shaft and the back-surface side casing.

Abstract: A supercharger includes a magnetic flux switching motor and a wheel. The motor includes a rotor; a stator stores the rotor therein and includes stator projecting portions projecting inward in a radial direction from an internal circumferential portion toward the rotor; a field source provided in a field slot formed between the stator projecting portions to generate a magnetic field of a constant direction; an armature coil provided in an armature slot; and a controller applying a single-phase current to the armature coil and changing a direction of the applied single-phase current to change a direction of a magnetic field generated from the armature coil and rotate the rotor. The wheel is attached to the rotor, and rotates together with rotation of the rotor to compress the air.

Abstract: A motor assembling method for an electric motor includes inserting a stator of the motor into a first housing of the motor through an opening of the first housing; fitting a shaft portion of a centering jig to an inner peripheral surface of the stator and a mounting portion of a first bearing of the motor in the first housing, and fitting a flange portion to the opening; fixing the stator on which centering is performed using the centering jig to the first housing; removing the centering jig from the first housing; and inserting a rotary shaft of the motor, the first bearing, and a second bearing of the motor into the first housing, and fixing a second housing of the motor to the opening.

Abstract: This turbocharger includes a rotating shaft extending along an axis, a turbine wheel provided at a first end portion of the rotating shaft, a compressor wheel provided at a second end portion of the rotating shaft, a housing accommodating at least a portion of the rotating shaft, bearings provided in the housing and configured to support the rotating shaft, supply flow paths supplying lubricating oil to the bearings, a discharge oil chamber formed in the housing and to which the lubricating oil is discharged from the bearings, and an oil drainage port formed below the discharge oil chamber, in which at least one of the discharge oil chamber and the oil drainage port is formed to be asymmetric between a first region and a second region defined by a vertical plane including the axis of the rotating shaft as a boundary plane.

Abstract: A turbocharger according to an embodiment of the present invention includes a rotating shaft, a compressor, a turbine, a compressor-side floating bearing and a turbine-side floating bearing that rotatably support the rotating shaft, and a bearing housing that houses the compressor-side floating bearing and the turbine-side floating bearing, the bearing housing being internally provided with a turbine-side oil feeding passage through which oil to be fed to the turbine-side floating bearing flows and a compressor-side oil feeding passage through which oil to be fed to the compressor-side floating bearing flows. A ratio of an oil feeding pressure for oil at an outlet of the compressor-side oil feeding passage to an oil feeding pressure for oil at an outlet of the turbine-side oil feeding passage is configured to be higher than 1.0 and lower than 1.5.

Abstract: A rolling bearing for rotatably supporting a rotating shaft; a housing for externally covering the rolling bearing in the radial direction of the rotating shaft; a sleeve disposed inside the housing in the radial direction of the rotating shaft with a gap there between and provided so as to be incapable of being displaced relative to an outer ring in the radial direction and circumferential direction of the rotating shaft; and a damper provided between the housing and the sleeve to support the sleeve so that the sleeve can be displaced relative to the housing in the axial direction of the rotating shaft, the damper absorbing the displacement of the sleeve in the radial direction of the rotating shaft.

Abstract: This turbocharger includes a rotating shaft extending along an axis, a turbine wheel provided at a first end portion of the rotating shaft, a compressor wheel provided at a second end portion of the rotating shaft, a housing accommodating at least a portion of the rotating shaft, bearings provided in the housing and configured to support the rotating shaft, supply flow paths supplying lubricating oil to the bearings, a discharge oil chamber formed in the housing and to which the lubricating oil is discharged from the bearings, and an oil drainage port formed below the discharge oil chamber, in which at least one of the discharge oil chamber and the oil drainage port is formed to be asymmetric between a first region and a second region defined by a vertical plane including the axis of the rotating shaft as a boundary plane.