Abstract: A seal structure includes a cylindrical outlet wall portion which forms an outlet passage at a downstream side of a turbine wheel and an annular shroud portion which is provided in a second nozzle ring and faces a blade portion. A proximal end portion of the outlet wall portion and a distal end portion of the shroud portion face each other with a gap interposed therebetween in an axial direction. An annular seal member is disposed at an inner peripheral portion of the gap in a radial direction. The seal member comes into contact with the proximal end portion of the outlet wall portion and the distal end portion of the shroud portion to block the gap.

Abstract: Provided is a rotating body, including: a shaft; and a compressor impeller including: a main body having an insertion hole, which extends from one end to another end side and is configured to receive the shaft inserted therethrough; a boss portion formed at one end side of the main body; and a joint portion, which is formed on an inner peripheral surface of the insertion hole at the boss portion and is welded to the shaft.

Abstract: A variable geometry turbocharger includes a turbine having a variable nozzle unit, and a compressor. The variable nozzle unit has: a unit main body part that is fixed to a turbine housing and rotatably supports a plurality of nozzle vanes; a drive ring that transmits a driving force to the plurality of nozzle vanes; and a drive ring support member that is fixed to the unit main body part and rotatably supports the drive ring. The drive ring support member is formed by one member and has: base end side parts that regulate movement of the drive ring in a radial direction; tip end side parts that regulate movement of the drive ring to the compressor side; and turbine side receiving parts that regulate movement of the drive ring to the turbine side in the direction of a rotational axis.

Abstract: Provided is a variable capacity turbocharger, including: a drive ring including a main body portion having an annular shape; a first projection portion and a second projection portion, which are formed on the main body portion, and are arranged apart from one another in a circumferential direction of the main body portion so as to sandwich a link plate to which a nozzle vane is mounted; and a cutout portion, which is formed in a portion of the main body portion between the first projection portion and the second projection portion.

Abstract: A projecting portion is formed on a nozzle ring, projects to a radially outer side with respect to a cylindrical portion, extends in a circumferential direction, and is held in abutment against a housing from a side of a link plate. A plate is faced to the nozzle ring on a side of a nozzle vane, and is configured to form a flow passage in a clearance to the nozzle ring. A pin is inserted into a first insertion portion formed in the nozzle ring and a second insertion portion formed in the plate, and to which the nozzle ring and the plate are mounted while the clearance is maintained. A counter bore groove is formed in the first insertion portion of the nozzle ring on the side of the link plate, and cut out the projecting portion.

Abstract: A base portion of the support ring includes as many joining areas as connection pins. The joining areas respectively surround pin holes through which to insert end portions of the connection pins, and are arranged in a circumferential direction of the support ring. Cuts are formed around each joining area of the support ring in order to allow deformation of an intermediate portion of the support ring relative to the joining area.

Abstract: A nozzle drive mechanism includes: a plurality of nozzle vanes; a plurality of link plates each fixed to a shaft portion of one of the plurality of nozzle vanes; a nozzle ring having an annular main body portion including shaft holes, each of which pivotally supporting a shaft portion of one of the nozzle vanes, the nozzle ring arranged between the link plates and the nozzle vanes; a regulation pin having one end attached to the main body portion of the nozzle ring and the other end protruding from an opposing surface of one of the link plates facing the nozzle ring; and a positioning pin provided separately from the regulation pin and assembled to a wall portion positioned opposite to the nozzle ring across the link plate at a position where the positioning pin is brought into contact when the nozzle ring rotates.

Abstract: Provided is a turbocharger, including: a turbine impeller(impeller); nozzle vanes provided on a radially outer side of the turbine impeller; a nozzle ring to which the nozzle vanes are provided; a heat-shielding member including: an outer contact portion, which is arranged between a back surface of the turbine impeller and a wall portion of a bearing housing (housing), and is brought into contact with the nozzle ring from a side opposite to the nozzle vanes; and an inner contact portion, which is at a position on an inner side in a radial direction of the shaft with respect to the outer contact portion, and is brought into contact with a wall portion of the bearing housing from the turbine impeller side; and a separation portion, which is formed on the wall portion of the bearing housing, and is recessed toward a side of separating from the heat-shielding member with respect to a contact portion to be brought into contact with the inner contact portion of the heat-shielding member.

Abstract: Provided is a nozzle drive mechanism, including: a bearing having a bearing hole; a drive shaft which is axially supported in the bearing hole so as to be rotatable; a drive lever including: an insertion portion into which another end portion (end portion) of the drive shaft protruding from the bearing hole is inserted; and a coupling portion, which is positioned on the bearing side with respect to a center of the drive shaft in an axial direction, and projects outward in a radial direction of the drive shaft from the insertion portion; a link pin coupled to the coupling portion; and a rod member, which is connected to the link pin, is positioned on a side opposite to the bearing with respect to the coupling portion, and is provided to an actuator.

Abstract: Provided is a mounting structure, including: an impeller including: a main body portion having a through hole; a plurality of blades provided to an outer peripheral surface of the main body portion; and a boss portion, which is a part of the main body portion, and protrudes toward one end side of the shaft with respect to the plurality of blades; a small-diameter portion, which is a part of the shaft; a first large-diameter portion, which is a part of the shaft, is located on another end side of the shaft with respect to the small-diameter portion; and a small-inner-diameter portion of the through hole, which is formed on a radially inner side of the boss portion, and has an inner diameter smaller than an inner diameter of a part of the through hole which is opposed to the first large-diameter portion in a radial direction.

Abstract: A variable geometry turbocharger includes a turbine having a variable nozzle unit, and a compressor. The variable nozzle unit has: a unit main body part that is fixed to a turbine housing and rotatably supports a plurality of nozzle vanes; a drive ring that transmits a driving force to the plurality of nozzle vanes; and a drive ring support member that is fixed to the unit main body part and rotatably supports the drive ring. The drive ring support member is formed by one member and has: base end side parts that regulate movement of the drive ring in a radial direction; tip end side parts that regulate movement of the drive ring to the compressor side; and turbine side receiving parts that regulate movement of the drive ring to the turbine side in the direction of a rotational axis.

Abstract: Multiple guide claws are formed integrally on a right side surface of a first nozzle ring of a variable nozzle unit and radially at intervals in a circumferential direction. Each guide claw has a guide groove with a U-shaped cross section, which is formed by lathe turning. A projecting portion is formed at an inner edge portion on the right side surface of the first nozzle ring. The projecting portion is formed on base portions of the multiple guide claws.

Abstract: A variable geometry system turbocharger includes a variable nozzle unit, which is disposed in a turbine housing by being sandwiched between the turbine housing and a bearing housing, and which adjusts a passage area for the exhaust gas to be supplied to a turbine impeller. The bearing housing includes a container recessed portion which contains a link mechanism of the variable nozzle unit.

Abstract: An annular seal flange is formed at an inner peripheral edge portion of an upstream-side seal ring. The seal flange projects in a downstream direction. When seal rings are viewed from radially inside, the seal flange of the upstream-side seal ring is designed to at least partially occlude an end gap of the downstream-side (the most downstream-side) seal ring.

Abstract: In a waste gate valve, an annular spacer is provided between a washer and an attachment tongue in an axial direction of a valve shaft of a valve. The spacer is made of a graphite material. An annular guard wall is formed on a back surface of the washer in such a way as to surround the spacer.

Abstract: A base portion of the support ring includes as many joining areas as connection pins. The joining areas respectively surround pin holes through which to insert end portions of the connection pins, and are arranged in a circumferential direction of the support ring. Cuts are formed around each joining area of the support ring in order to allow deformation of an intermediate portion of the support ring relative to the joining area.

Abstract: An annular seal flange is formed at an inner peripheral edge portion of an upstream-side seal ring. The seal flange projects in a downstream direction. When seal rings are viewed from radially inside, the seal flange of the upstream-side seal ring is designed to at least partially occlude an end gap of the downstream-side (the most downstream-side) seal ring.

Abstract: In a waste gate valve, an annular spacer is provided between a washer and an attachment tongue in an axial direction of a valve shaft of a valve. The spacer is made of a graphite material. An annular guard wall is formed on a back surface of the washer in such a way as to surround the spacer.

Abstract: Multiple guide claws are formed integrally on a right side surface of a first nozzle ring of a variable nozzle unit and radially at intervals in a circumferential direction. Each guide claw has a guide groove with a U-shaped cross section, which is formed by lathe turning. A projecting portion is formed at an inner edge portion on the right side surface of the first nozzle ring. The projecting portion is formed on base portions of the multiple guide claws.

Abstract: A variable geometry system turbocharger includes a variable nozzle unit, which is disposed in a turbine housing by being sandwiched between the turbine housing and a bearing housing, and which adjusts a passage area for the exhaust gas to be supplied to a turbine impeller. The bearing housing includes a container recessed portion which contains a link mechanism of the variable nozzle unit.