Abstract: A variable capacity turbocharger includes a housing, a turbine impeller at least partially located in the housing, a scroll flow path located in the housing and encircling the turbine impeller, a first nozzle ring and a second nozzle ring facing each other in the housing, a nozzle flow path located between the first nozzle ring and the second nozzle ring and fluidly coupling the scroll flow path to the turbine impeller, a gap formed between the first nozzle ring and the housing, and a bearing hole located in the first nozzle ring and including an opening adjacent to the gap. The gap is located on an opposite side of the first nozzle ring to the nozzle flow path. Additionally, the gap is connected to the scroll flow path.

Abstract: A variable capacity turbocharger includes a housing, a turbine impeller at least partially located in the housing, a scroll flow path located in the housing and encircling the turbine impeller, a first nozzle ring and a second nozzle ring facing each other in the housing, a nozzle flow path located between the first nozzle ring and the second nozzle ring and fluidly coupling the scroll flow path to the turbine impeller, a gap formed between the first nozzle ring and the housing, and a bearing hole located in the first nozzle ring and including an opening adjacent to the gap. The gap is located on an opposite side of the first nozzle ring to the nozzle flow path. Additionally, the gap is connected to the scroll flow path.

Abstract: A variable capacity turbocharger includes a variable nozzle unit having a shroud-side ring in which a first bearing hole is provided, a hub-side ring in which a second bearing hole is provided, a nozzle flow path formed between the shroud-side ring and the hub-side ring, and a nozzle vane disposed in the nozzle flow path and supported by both the first bearing hole and the second bearing hole. A turbine housing having a scroll flow path is connected to the nozzle flow path, in which the first bearing hole penetrates the shroud-side ring and communicates with the scroll flow path through a gap between the shroud-side ring and the turbine housing. Additionally, an opening of the first bearing hole on the gap side is smaller than an opening of the first bearing hole on the nozzle flow path side.

Abstract: A rod assembly includes a turnbuckle that extends along a central axis, a first rod that is to be screwed into a first adjustment hole of the turnbuckle, a second rod that is to be screwed into a second adjustment hole of the turnbuckle, a first nut that is fitted to a first adjustment end portion of the first rod, and a second nut that is fitted to a second adjustment end portion of the second rod. A first turnbuckle-welded portion is provided between the first nut and the turnbuckle, and a second turnbuckle-welded portion is provided between the second nut and the turnbuckle. A first rod-welded portion is provided between the first nut and the first rod, and a second rod-welded portion is provided between the second nut and the second rod.

Abstract: A variable capacity turbocharger includes a variable nozzle unit having a shroud-side ring in which a first bearing hole is provided, a hub-side ring in which a second bearing hole is provided, a nozzle flow path formed between the shroud-side ring and the hub-side ring, and a nozzle vane disposed in the nozzle flow path and supported by both the first bearing hole and the second bearing hole. A turbine housing having a scroll flow path is connected to the nozzle flow path, in which the first bearing hole penetrates the shroud-side ring and communicates with the scroll flow path through a gap between the shroud-side ring and the turbine housing. Additionally, an opening of the first bearing hole on the gap side is smaller than an opening of the first bearing hole on the nozzle flow path side.

Abstract: A rod assembly includes a turnbuckle that extends along a central axis, a first rod that is to be screwed into a first adjustment hole of the turnbuckle, a second rod that is to be screwed into a second adjustment hole of the turnbuckle, a first nut that is fitted to a first adjustment end portion of the first rod, and a second nut that is fitted to a second adjustment end portion of the second rod. A first turnbuckle-welded portion is provided between the first nut and the turnbuckle, and a second turnbuckle-welded portion is provided between the second nut and the turnbuckle. A first rod-welded portion is provided between the first nut and the first rod, and a second rod-welded portion is provided between the second nut and the second rod.

Abstract: A turbocharger includes: a housing; a bearing member provided in the housing and having bearing surface; and a shaft having received surface facing the bearing surface, respectively, in a direction of a rotational axis and a large diameter portion extending from an outer periphery of the received surface and formed with a separation portion spaced apart from the bearing surface more than the received surface is.

Abstract: A multistage turbocharging system (1) in which the thickness of at least either one of a valve body (51a) that opens and closes a bypass flow passage opening and a washer (51b) that fixes the valve body (51a) to a mounting portion (52) is greater than the minimum width of a flow passage from a valve assembly (51) to a turbine impeller (2d) of the first turbocharger (2).

Abstract: A multistage turbocharging system (1) in which the thickness of at least either one of a valve body (51a) that opens and closes a bypass flow passage opening and a washer (51b) that fixes the valve body (51a) to a mounting portion (52) is greater than the minimum width of a flow passage from a valve assembly (51) to a turbine impeller (2d) of the first turbocharger (2).

Abstract: A multistage turbocharging system provided with a first turbocharger, a second turbocharger, and an exhaust bypass valve device, in which a seal surface of the opening of the bypass flow passage that is abutted by the bottom surface of the valve body of the exhaust bypass valve device has a higher oxidation resistance than the housing of the second turbocharger.