MITSUBISHI HEAVY INDUSTRIES ENGINE & TURBOCHARGER, LTD.

Provided is a divided-chamber gas engine having a main combustion chamber and a sub-chamber communicating with the main combustion chamber via a plurality of nozzle holes, the divided-chamber gas engine comprising a main combustion chamber formation part that forms the main combustion chamber, a sub-chamber formation part that forms the sub-chamber, an intake line for guiding a mixture containing gas fuel and air to the main combustion chamber, a spark plug that is disposed in the sub-chamber and is configured to ignite unburned fuel, and an air-fuel mixture introduction line that branches from the intake line and guides the air-fuel mixture flowing through the intake line as at least a portion of unburned fuel to the sub-chamber.

Provided is an annular compressor cover forming a passage wall of a diffuser passage in a centrifugal compressor, wherein, when the end-of-winding position of a scroll passage of the centrifugal compressor is defined as the 360° position of the compressor cover in the circumferential direction, the direction in which a fluid flows through the scroll passage in the circumferential direction is defined as the positive direction of positions in the circumferential direction, and the distance between outlets of the diffuser passage at each position in the circumferential direction and the central axis of the inner circumferential surface of the compressor cover is defined as the diffuser radius, the average value of the diffuser radius in a range up to 180° from the position of a tongue section of the scroll passage in the circumferential direction is smaller than the average value of the diffuser radius in a range from 180° to 360° in the circumferential direction.

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.

A casing that is for a rotating machine and that is configured such that a plurality of housings are linked together, the casing comprising: a first housing including a first connection part that protrudes outward in a radial direction of the rotating machine and that has a first surface extending along the radial direction; a second housing including a second connection part that protrude outward in the radial direction and that has a second surface extending along the radial direction and being in contact with the first surface; and at least one fastening device that fastens the first connection part and the second connection part in the axial direction of the rotating machine, wherein at least one of the first surface or the second surface includes, at least at a portion thereof, a rough surface region having formed therein a plurality of laser irradiation marks formed by irradiation with laser light.

This electric compressor comprises: a housing that includes a stator having a cylindrical shape; a rotating shaft that is disposed inside the housing and that has a rotor facing the stator; a low pressure wheel that is fixed to one axial side of the rotating shaft; a high pressure wheel that is fixed to the other axial side of the rotating shaft; a low pressure side air bearing that rotatably supports, in the housing, a low pressure side shaft section of the rotating shaft; a high pressure side air bearing that rotatably supports, in the housing, a high pressure side shaft section of the rotating shaft; a first air flow path that supplies compressed air from the housing to either one of the low pressure side air bearing and the high pressure side air bearing; a second air flow path that branches from the first air flow path and that supplies the compressed air to the other of the low pressure side air bearing and the high pressure side air bearing; and an air flow rate adjustment device that adjusts a flow rate of the compressed air flowing in the first air flow path and the second air flow path.

A hydrogen engine using fuel gas containing hydrogen, including: a cylinder; a piston movable within the cylinder; a cylinder head forming a combustion chamber with the piston, and including an intake port connected to the combustion chamber and a fuel supply port connected to the combustion chamber; an intake valve for opening and closing the intake port; a fuel supply valve for opening and closing the fuel supply port; and a valve train commonly provided for the intake valve and the fuel supply valve, and configured to open and close the intake valve and the fuel supply valve in conjunction with each other. The hydrogen engine is configured such that a valve opening timing of the fuel supply valve is more retarded than a valve opening timing of the intake valve.

An aspect of an exhaust turbine according to the present disclosure is provided with: a rotating shaft; a turbine wheel attached to one end side of the rotating shaft; a turbine housing having a scroll portion formed on an outer peripheral side of the turbine wheel; a bearing housing that accommodates a bearing for supporting the rotating shaft; a fastening member that fastens a first flange portion of the turbine housing and a second flange portion of the bearing housing together; and a heat-shielding plate having an outer peripheral edge portion held between the first flange portion and the second flange portion. In a first cross section that passes through the center of the rotating shaft and a tongue portion of the turbine housing along an axial direction of the rotating shaft, when the innermost position, in a radial direction of the rotating shaft, of a contact surface between the first flange portion and the outer peripheral edge portion of the heat-shielding plate is defined as a first seal inner end, the innermost position, in the radial direction, of a contact surface between the second flange portion and the outer peripheral edge portion of the heat-shielding plate is defined as a second seal inner end, and one of the first seal inner end and the second seal inner end that is positioned outside in the radial direction is defined as a seal inner end, the seal inner end is disposed outside the tongue portion in the radial direction.

This turbine housing for accommodating at least a portion of a turbine wheel comprises: a first scroll flow path for supplying a working gas to the turbine wheel; and a first tongue portion formed at the outlet position of the first scroll flow path. The first tongue portion includes, in a cross section along the axial direction of the turbine wheel, inner end edges between the front edges of turbine wheel impellers and facing each other across a clearance in the radial direction of the turbine wheel. The inner end edges each include one or more inclined portions that incline relative to the axial direction. The inner end edge is configured to satisfy B≥0.2A, A being the size of the area in the axial direction where the front edge is provided, and B being the total of sizes of the areas in the axial direction where the one or more inclined portions are respectively provided.

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.

A misfire detecting device for an internal combustion engine, having a plurality of cylinders is provided with: a pulsation component acquiring unit for performing a frequency analysis of operating parameter data indicating a change over time in an operating parameter correlated with an overall operating state of the plurality of cylinders, and for acquiring a pulsation component spectrum, which is a frequency spectrum of pulsations of the internal combustion engine; a difference parameter acquiring unit for acquiring a difference parameter correlated with a degree of difference between the operations of each of the plurality of cylinders; and all-cylinder misfire determining unit for determining that an all-cylinder misfire has occurred in the internal combustion engine if the pulsation component spectrum acquired by the pulsation component acquiring unit falls below a first threshold and the difference parameter acquired by the difference parameter acquiring unit 12 falls below a second threshold.