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: Provided is a prediction system that predicts whether a prescribed event will occur in a device, without being affected by differences among individual devices. The prediction system comprises: a data acquisition unit which acquires operation data representing the operation status of a device; a probability density estimation unit which estimates the probability density of the operation data; and an abnormality prediction unit which predicts whether an abnormality will occur in the device on the basis of the probability density estimation results of the operation data and a prediction model.

Abstract: A scroll casing of a centrifugal compressor includes a scroll part forming a scroll passage of the centrifugal compressor. The scroll part has a near-circular scroll cross-section which includes a first arc portion extending from a connection position with a hub-side passage surface of a diffuser passage of the centrifugal compressor (first position) to a one-direction side (side toward fourth position), a second arc portion formed on the one-direction side of the first arc portion so as to include at least a part of a region between an outermost end in the radial direction (second position) and an innermost end in the radial direction (fourth position), and a third arc portion formed on the one-direction side of the second arc portion so as to include an end position of the scroll part on the one-direction side (fifth position) and satisfies a relationship of R2>R3, where R2 is a curvature radius of the second arc portion, and R3 is a curvature radius of the third arc portion.

Abstract: This generator set is provided with an airflow path which has an air inlet and an air outlet and through which a cooling air flows, a power generator, an alternator which is driven by the power generator, and a radiator which is installed in the airflow path, with a cooling medium circulating between the power generator and the radiator, wherein the inflow area of the cooling airflow into the radiator is greater than the passage area of the air inlet.

Abstract: A centrifugal compressor (P) is provided with: a casing (10) which forms an impeller inlet flow path (11), an impeller flow path (12), an impeller outlet flow path (13), and a scroll (14); and an impeller (3) which is arranged in the impeller flow path (11), wherein the casing (10) is provided with a casing body (15) and a heat conduction inhibiting part (16) which is disposed to heat conduction paths to the impeller inlet flow path (11) from at least the impeller outlet flow path (13) and the scroll (14) so as to inhibit heat conduction to the impeller inlet flow path (11) from at least the impeller outlet flow path (13) and the scroll (14).

Abstract: A precombustion chamber gas engine includes a main-chamber forming portion forming a main combustion chamber, a precombustion-chamber forming portion forming a precombustion chamber communicating with the main combustion chamber via a plurality of nozzle holes, and an ignition device disposed in the precombustion chamber and having an ignition portion spaced from a main chamber central axis of the main combustion chamber at a predetermined distance. In a plan view, the precombustion chamber has a near-ignition region including the ignition portion and a far-ignition region opposite to the near-ignition region separated by a borderline passing through a precombustion chamber central axis of the precombustion chamber and perpendicular to a straight line passing through the precombustion chamber central axis and the ignition portion.

Abstract: A coupling device according to an embodiment is a coupling device for connecting a first shaft and a second shaft that includes a primary inner ring member mounted on the first shaft, a primary outer ring member disposed on an outer circumferential side of the primary inner ring member, a primary elastic member for connecting the primary inner ring member and the primary outer ring member, a secondary inner ring member mounted on the second shaft, a secondary outer ring member disposed on an outer circumferential side of the secondary inner ring member, a secondary elastic member for connecting the secondary inner ring member and the secondary outer ring member, and a weight attaching plate interposed between the primary outer ring member and the secondary outer ring member, the weight attaching plate including a weight attaching portion capable of attaching and detaching an additional weight to and from the outer circumferential side of the primary outer ring member and the outer circumferential side of the

Abstract: A turbine is provided with: a turbine wheel configured to rotate about an axis O1; a turbine housing accommodating the turbine wheel and defining an annular nozzle passage on the outer peripheral side of the turbine wheel; and a plurality of low solidity nozzle vanes 6 arranged in the nozzle passage at an interval in the circumferential direction. Circumferentially adjacent low solidity nozzle vanes 6 are disposed at different radial positions in a connection position of each of the low solidity nozzle vanes 6 with a hub-side wall surface of the hub-side wall surface and a shroud-side wall surface which define the nozzle passage.

Abstract: At least one thermal barrier coating member mounted on an inner wall surface, facing a combustion chamber of an engine, of a cylinder liner accommodating a piston slidably along an axial direction, is provided with: a base layer configured to be detachably fitted into a recess formed in the inner wall surface of the cylinder liner; and a thermal barrier coating layer formed on an opposite side of the base layer from the inner wall surface of the cylinder liner. The thermal barrier coating layer is disposed above a piston ring which is positioned at an uppermost position in the axial direction of the cylinder liner when the piston reaches top dead center.

Abstract: A turbine housing has a scroll passage.

Abstract: A variable geometry turbocharger according to an embodiment includes a rotational shaft; a turbine wheel disposed on one end side of the rotational shaft; a compressor wheel disposed on another end side of the rotational shaft; a bearing housing for housing a bearing part for rotatably supporting the rotational shaft; a variable nozzle structure for controlling a flow rate of an exhaust gas flowing into the turbine wheel, the variable nozzle structure including a nozzle plate and nozzle mount that define an exhaust gas flow passage for allowing the exhaust gas to flow into the turbine wheel, a nozzle vane disposed rotatably about a support shaft in the exhaust gas flow passage, and a drive part for rotating the nozzle vane, the drive part being disposed in an internal space defined between the bearing housing and the nozzle mount; and a cooling gas passage for extracting compressed gas compressed by the compressor wheel and introducing the compressed gas into the internal space.

Abstract: A compressor is provided with: an impeller a housing configured to rotatably house the impeller and having an intake passage for introducing a gas to the impeller from outside the housing, a scroll passage for guiding the gas having passed through the impeller to the outside, and a bypass passage connecting the intake passage and the scroll passage so as to bypass the impeller; and a bypass valve having a valve body disposed in the bypass passage and capable of opening and closing the bypass passage. The valve body is configured to, in a fully closed state, separate the bypass passage into an inlet-side passage having a communication port communicating with the scroll passage and an outlet-side passage communicating with the intake passage. An inlet-side passage wall surface which defines the inlet-side passage includes at least an upstream passage wall surface portion connected to an upstream end of the communication port in a cross-sectional view of the housing taken along an axis of the impeller.

Abstract: An internal combustion engine includes an internal combustion engine main body including a plurality of cylinders, a knock sensor provided on each of the plurality of cylinders, a control board including an amplification circuit, and a plurality of cables differing in length and each connecting the knock sensor and the control board. The amplification circuit includes, for each of the plurality of cables, a first charge amplifier connected to a first output terminal of the knock sensor via one of the plurality of cables, a second charge amplifier connected to a second output terminal of the knock sensor via one of the plurality of cables, and a differential amplifier configured to take an output of the first charge amplifier and an output of the second charge amplifier as input.

Abstract: A cylinder liner includes: a small diameter portion configured to form a cooling water passage between the small diameter portion and an inner peripheral surface of the cylinder block; a large diameter portion disposed adjacent to the small diameter portion in the axial direction and formed to have a larger diameter than the small diameter portion; and at least one seal groove formed on an outer peripheral surface of the large diameter portion in an annular shape along a circumferential direction. The large diameter portion includes a one-side wall portion formed between the cooling water passage and a cooling-water-passage-side seal groove which is a seal groove disposed closest to the cooling water passage in the axial direction, and an other-side wall portion disposed farther from the cooling water passage than the cooling-water-passage-side seal groove is in the axial direction.

Abstract: Provided is a control device configured to be able to execute, in an engine which includes a DOC, a DPF, and a temperature increase unit including an exhaust throttle valve, for increasing a temperature of each of the DOC and the DPF, a forced regeneration process of removing PM deposited on the DPF by increasing the temperature of the DPF. The control device includes a flow rate estimation part configured to estimate an intake flow rate of a combustion gas sent into a cylinder of the engine.

Abstract: An engine oil state control device for controlling a fuel mixture ratio of a fuel mixed in an engine oil of an engine on which a predetermined combustion control is performed includes comprising a fuel mixture ratio acquisition part configured to acquire the fuel mixture ratio, and an oil temperature rise control part configured to perform an oil temperature rise control for increasing an evaporation rate of the fuel mixed in the engine oil if the fuel mixture ratio is equal to or greater than a first threshold.

Abstract: An impeller for a centrifugal turbomachine includes: a hub having a small-diameter portion positioned at a first end portion in an axial direction and a large-diameter portion positioned at a second end portion in the axial direction, the large-diameter portion having a greater diameter than the small-diameter portion; and a blade having a first edge positioned at an axial-directional position of the small-diameter portion and a second edge positioned at an axial-directional position of the large-diameter portion, the blade being disposed on an outer peripheral surface of the hub. The impeller is configured such that, when a first radial-directional cross section is a cross section of the impeller at an axial-directional position passing a tip of the first edge, at least a part of the first radial-directional cross section in a blade-height range of 50% or more is inclined downstream in a rotational direction of the impeller with respect to a radial direction.

Abstract: A vibration-proof mount which is interposed between a vibration device including a vibration source and an elastic member disposed on a foundation surface includes an upper base plate including a first mounting portion where the vibration device is mounted, a lower base pate arranged below the upper base plate and supporting the upper base plate, and a plurality of connecting members connecting the upper base plate and the lower base plate, the plurality of connecting members including at least two or more first connecting members disposed between the first mounting portion and the lower base plate at intervals from one another. The first mounting portion is configured to have higher rigidity than the lower base plate.

Abstract: A turbine shaft used for a turbocharger including a turbine and a compressor includes a turbine impeller, and a rotor shaft joined on one end side to the turbine impeller. The rotor shaft includes a fitting region configured to fit with a compressor impeller of the compressor by inserting the other end side of the rotor shaft into a through hole formed in the compressor impeller, a fastening region formed between the fitting region and the other end side of the rotor shaft, and configured to allow fastening by a fastening part, and a tapered part having a maximum outer diameter at a position closest to the turbine impeller in the fitting region and formed such that an outer diameter of the rotor shaft decreases from the position closest to the turbine impeller toward a tip side of the compressor impeller.

Abstract: An impeller of a centrifugal compressor is an impeller 5 of a centrifugal compressor, that is, a compressor impeller 5 and includes a hub, at least one airfoil portion erected on a hub surface of the hub, and a first fillet. The at least one airfoil portion has a trailing edge configured such that a distance between the trailing edge and an axis of the centrifugal compressor increases with increasing distance from a back surface of the hub. The first fillet is formed on a radially outer side of an outer peripheral surface of a back plate portion forming a back surface portion of the hub. The first fillet connects the outer peripheral surface of the back plate portion and the trailing edge of the at least one airfoil portion.