Abstract: A turbocharger includes: a nozzle drive mechanism for driving a plurality of nozzle vanes; and a support ring for holding the nozzle drive mechanism, the support ring having a main body portion having a heat shielding portion facing a turbine impeller in a direction of a rotational axis of the turbine impeller.

Abstract: Provided is a turbocharger, including: a separation wall surface, which is a wall surface of a bearing housing on a turbine impeller side, is positioned on an inner side with respect to an outer periphery of a back surface of the turbine impeller on the bearing housing side in a radial direction of a shaft, and is separated from the back surface in an axial direction of the shaft; and a heat-shielding plate, including: a main body portion (separation portion), which is separated from the separation wall surface in the axial direction, and is positioned between the back surface of the turbine impeller and the separation wall surface; and an insertion through hole (insertion portion), which receives a fastening member inserted thereinto in a direction of intersecting the axial direction of the shaft, the heat-shielding plate being mounted to the bearing housing by the fastening member.

Abstract: A variable geometry system turbocharger includes an annular heat shield plate which shields heat from a turbine wheel side. The heat shield plate is integrally provided at a central part of a side surface of a bearing housing opposed to a back surface of a turbine disk. A first seal ring is provided between an inner peripheral surface of a first nozzle ring and an outer peripheral surface of the heat shield plate. A second seal ring is provided between an inner peripheral surface of a second nozzle ring and an outer peripheral surface of a protrusion of a turbine housing.

Abstract: A second nozzle shaft of each variable nozzle has an outer diameter smaller than that of a first nozzle shaft. The first nozzle shaft is integrally formed on a first side surface of each variable nozzle. A portion is provided on a second side surface of each variable nozzle. The portion encloses the second nozzle shaft, and can contact a second nozzle ring. An inner nozzle flange and an outer nozzle flange which can contact a first nozzle ring are integrally formed on base sides of the first nozzle shaft on a blade surface and a blade surface of each variable nozzle, respectively.

Abstract: A turbocharger includes: a nozzle drive mechanism for driving a plurality of nozzle vanes; and a support ring for holding the nozzle drive mechanism, the support ring having a main body portion having a heat shielding portion facing a turbine impeller in a direction of a rotational axis of the turbine impeller.

Abstract: Provided is a turbocharger, including: a separation wall surface, which is a wall surface of a bearing housing on a turbine impeller side, is positioned on an inner side with respect to an outer periphery of a back surface of the turbine impeller on the bearing housing side in a radial direction of a shaft, and is separated from the back surface in an axial direction of the shaft; and a heat-shielding plate, including: a main body portion (separation portion), which is separated from the separation wall surface in the axial direction, and is positioned between the back surface of the turbine impeller and the separation wall surface; and an insertion through hole (insertion portion), which receives a fastening member inserted thereinto in a direction of intersecting the axial direction of the shaft, the heat-shielding plate being mounted to the bearing housing by the fastening member.

Abstract: A bottom surface of a housing recess of a turbine housing includes a close attachment portion in a continuous annular land shape, which is located radially outside a fitting recess. The close attachment portion is closely attached to a portion radially outside first support holes in a surface of a shroud ring opposite from its facing surface, by a fastening force of attachment bolts. The first support holes in the shroud ring communicate with an outlet side of a turbine impeller through a connection path and a cutout.

Abstract: Three or more attachment pins are arranged on a right lateral surface of a nozzle ring at intervals. All the attachment pins are placed outside support holes in the nozzle ring in radial directions of the nozzle ring. A guide ring is provided across right lateral surfaces of the attachment pins. A first side guide member to support a right lateral surface of a drive ring in away that allows the right lateral surface to be in sliding contact therewith is provided to the right of the guide ring. A second side guide member to support a left lateral surface of the drive ring in a way that allows the left lateral surface to be in sliding contact therewith is provided to the left of the guide ring.

Abstract: A variable geometry system turbocharger includes an annular heat shield plate which shields heat from a turbine wheel side. The heat shield plate is integrally provided at a central part of a side surface of a bearing housing opposed to a back surface of a turbine disk. A first seal ring is provided between an inner peripheral surface of a first nozzle ring and an outer peripheral surface of the heat shield plate. A second seal ring is provided between an inner peripheral surface of a second nozzle ring and an outer peripheral surface of a protrusion of a turbine housing.

Abstract: A second nozzle shaft of each variable nozzle has an outer diameter smaller than that of a first nozzle shaft. The first nozzle shaft is integrally formed on one side surface of each variable nozzle. A portion is provided on the other side surface of each variable nozzle. The portion encloses the second nozzle shaft, and can contact a second nozzle ring. An inner nozzle flange and an outer nozzle flange which can contact a first nozzle ring are integrally formed on baes sides of the first nozzle shaft on a blade surface and a blade surface of each variable nozzle, respectively.

Abstract: A bottom surface of a housing recess of a turbine housing includes a close attachment portion in a continuous annular land shape, which is located radially outside a fitting recess. The close attachment portion is closely attached to a portion radially outside first support holes in a surface of a shroud ring opposite from its facing surface, by a fastening force of attachment bolts. The first support holes in the shroud ring communicate with an outlet side of a turbine impeller through a connection path and a cutout.

Abstract: Three or more attachment pins are arranged on a right lateral surface of a nozzle ring at intervals. All the attachment pins are placed outside support holes in the nozzle ring in radial directions of the nozzle ring. A guide ring is provided across right lateral surfaces of the attachment pins. A first side guide member to support a right lateral surface of a drive ring in away that allows the right lateral surface to be in sliding contact therewith is provided to the right of the guide ring. A second side guide member to support a left lateral surface of the drive ring in a way that allows the left lateral surface to be in sliding contact therewith is provided to the left of the guide ring.

Abstract: A compressor casing defines an air inlet port, an air intake passage with an impeller accommodated therein, a diffuser and a scroll all communicated with each other in the order named. An annually extending chamber is formed between the passage and the scroll and has an opening opened sideways of the impeller in the passage, enhancing an ability of discharging a surging-occuring range to a lower flow rage. The compressor casing may be divided into a casing main body and an inner casing so as to decrease fabrication cost of the compressor casing.