Abstract: A multi-stage turbocharger includes a turbine housing including a first sub-housing that has a first turbine-wheel chamber and a second sub-housing that has a second turbine-wheel chamber arranged in series to the first turbine-wheel chamber, a first compressor housing coupled to the turbine housing via a first bearing housing, and a second compressor housing coupled to the turbine housing via a second bearing housing. The first sub-housing and the second sub-housing are formed integrally with each other.

Abstract: A turbine impeller includes: a base material which contains aluminum as a main element; and an anti-erosion coating which covers a surface of the base material. Accordingly, since liquid droplets hit the anti-erosion coating before the base material even when the liquid droplets flow into the rotating turbine impeller, the damage to the base material due to erosion is suppressed.

Abstract: Provided is a turbocharger, including: a compressor impeller (impeller) having a through hole; a shaft inserted through the through hole; and a fastening member caulked to a distal end portion of the shaft projecting from the through hole.

Abstract: Provided is a turbocharger, including: a compressor impeller (impeller) having a through hole; a shaft inserted through the through hole; and a fastening member caulked to a distal end portion of the shaft projecting from the through hole.

Abstract: A multi-stage turbocharger includes a turbine housing including a first sub-housing that has a first turbine-wheel chamber and a second sub-housing that has a second turbine-wheel chamber arranged in series to the first turbine-wheel chamber, a first compressor housing coupled to the turbine housing via a first bearing housing, and a second compressor housing coupled to the turbine housing via a second bearing housing. The first sub-housing and the second sub-housing are formed integrally with each other.

Abstract: A variable nozzle unit in a variable-capacity supercharger includes: a first nozzle ring disposed in a turbine housing and formed with a plurality of first support holes; a second nozzle ring disposed to face the first nozzle ring and formed with a plurality of second support holes that are through-holes corresponding to the first support holes; a plurality of variable nozzles supported rotatably by the first and second nozzle rings; and a plurality of seal members disposed between a turbine scroll channel and a turbine wheel side. The variable nozzles include first nozzle shafts that are rotatably supported by the first support holes, and second nozzle shafts that are rotatably supported by the second support holes, and a first seal member included in the plurality of seal members is provided at the turbine wheel side relative to the second support holes.

Abstract: Provided is a turbocharger, including: a compressor impeller (impeller) having a through hole; a shaft inserted through the through hole; and a fastening member caulked to a distal end portion of the shaft projecting from the through hole.

Abstract: Provided is a nozzle drive mechanism, including: a bearing; a drive shaft inserted into a bearing hole; and a link plate having an opposing portion, which is opposed to at least the bearing in an axial direction of the drive shaft, and is subjected to hardening treatment, the link plate being fixed to the drive shaft by caulking, bolt-fastening, or press-fitting.

Abstract: A variable nozzle unit in a variable-capacity supercharger includes: a first nozzle ring disposed in a turbine housing and formed with a plurality of first support holes; a second nozzle ring disposed to face the first nozzle ring and formed with a plurality of second support holes that are through-holes corresponding to the first support holes; a plurality of variable nozzles supported rotatably by the first and second nozzle rings; and a plurality of seal members disposed between a turbine scroll channel and a turbine wheel side. The variable nozzles include first nozzle shafts that are rotatably supported by the first support holes, and second nozzle shafts are rotatably supported by the second support holes, and a first seal member included in the plurality of seal members is provided at the turbine wheel side relative to the second support holes.

Abstract: A seal body 24 is formed annularly to have a fitted/fixed portion 25 airtightly fitted and fixed to a shoulder 22 in a turbine housing 1 formed facing a scroll passage 8 and have a clearance facing portion 27 facing an outer periphery of a turbine-housing-side exhaust introducing wall 9a with a clearance S, the clearance facing portion 27 being caused to be pressed against the exhaust introducing wall 9a due to a difference in fluid pressure between the clearance S and the scroll passage 8. Slipout preventive means 29 is formed on the fitted/fixed portion 25 of the seal body 24 for preventing the fitted/fixed portion 25 from slipping out of the shoulder 22.

Abstract: A variable geometry turbocharger includes a bearing housing rotatably supporting a turbine impeller; and an exhaust nozzle changing the flow rate of an exhaust gas supplied to the turbine impeller, wherein the exhaust nozzle has an exhaust inlet wall disposed at the bearing housing side, the turbocharger has a seal member exhibiting a ring shape and sealing a gap formed between the bearing housing and the exhaust inlet wall, and an inner circumferential edge of the seal member firmly contacts the bearing housing and an outer circumferential edge of the seal member firmly contacts the exhaust inlet wall.

Abstract: A seal body 24 is formed annularly to have a fitted/fixed portion 25 airtightly fitted and fixed to a shoulder 22 in a turbine housing 1 formed facing a scroll passage 8 and have a clearance facing portion 27 facing an outer periphery of a turbine-housing-side exhaust introducing wall 9a with a clearance S, the clearance facing portion 27 being caused to be pressed against the exhaust introducing wall 9a due to a difference in fluid pressure between the clearance S and the scroll passage 8. Slipout preventive means 29 is formed on the fitted/fixed portion 25 of the seal body 24 for preventing the fitted/fixed portion 25 from slipping out of the shoulder 22.

Abstract: A turbocharger is disclosed. The turbocharger includes a seal plate facing a front portion outer periphery of an oil thrower arranged between a bearing portion and an impeller in front thereof, integral with a bearing housing. An oil-thrower facing part formed in the bearing housing faces a rear portion outer periphery of the oil thrower to provide an oil sump. The seal plate is in the form of press-fit plate, a diameter of the press-fit plate being smaller than an outer diameter of the impeller and being at least equal to a minimum working bore diameter for machining of an outer periphery or oil discharge openings of the oil-thrower facing part.

Abstract: A turbocharger including a sealing device for prevention of fluid leakage from high to low pressure sides through a radially extending annular gap formed between a shroud and a shroud-confronting portion which constitute the turbocharger is provided. The sealing device includes a frustoconical disc spring seal member arranged in a pressed manner in the gap between the shroud and the shroud-confronting portion. Accordingly, fluid leakage from high to low pressure sides through an annular gap formed between constructional members of a turbocharger and extending radially of a turbine shaft may be prevented.

Abstract: A sealing device for prevention of exhaust gas in a scroll passage from leaking via a gap to a turbine impeller is arranged upstream, in a travel direction of the exhaust gas, of through-holes via which the vane shafts extend through a rear exhaust introduction wall, whereby pressure in a gap communicating with the through-holes of the rear wall is kept lower than pressure in an exhaust nozzle so as to displace nozzle vanes to the rear wall.

Abstract: An exhaust nozzle 9 has nozzle vanes 15 interposed between front and rear exhaust introduction walls 10 and 51. A space 19 is between the wall 51 and a turbine housing 1. A sealing device 25 is arranged upstream, in a direction of exhaust gas, of each through hole 24 provided in the wall 51 for penetration of a vane shaft 16a to prevent exhaust gas in a scroll passage 8 from leaking through the space 19 to a turbine impeller 4. Each of the walls 10 and 51 is disk-shaped, the turbine housing 1 being formed with a shoulder 50 to which the wall 51 is fitted with the space 19.

Abstract: A seal body 24 is formed annularly to have a fitted/fixed portion 25 airtightly fitted and fixed to a shoulder 22 in a turbine housing 1 formed facing a scroll passage 8 and have a clearance facing portion 27 facing an outer periphery of a turbine-housing-side exhaust introducing wall 9a with a clearance S, the clearance facing portion 27 being caused to be pressed against the exhaust introducing wall 9a due to a difference in fluid pressure between the clearance S and the scroll passage 8. Slipout preventive means 29 is formed on the fitted/fixed portion 25 of the seal body 24 for preventing the fitted/fixed portion 25 from slipping out of the shoulder 22.

Abstract: A variable geometry turbocharger includes a bearing housing rotatably supporting a turbine impeller; and an exhaust nozzle changing the flow rate of an exhaust gas supplied to the turbine impeller, wherein the exhaust nozzle has an exhaust inlet wall disposed at the bearing housing side, the turbocharger has a seal member exhibiting a ring shape and sealing a gap formed between the bearing housing and the exhaust inlet wall, and an inner circumferential edge of the seal member firmly contacts the bearing housing and an outer circumferential edge of the seal member firmly contacts the exhaust inlet wall.

Abstract: An impeller comprising a wheel portion extending in an axial direction and a plurality of blades arranged around the wheel portion is produced by assembling a mold divisible into a plurality of parts having a cavity adapted for forming an outer profile of the impeller, injecting a kneaded matter including powder of a metal or a ceramic and binder to mold a green body, degreasing and sintering the green body to obtain a sintered body, embedding the sintered body into a die having a cavity adapted for modifying the outer profile of the impeller, and pressurizing the die to modify the outer profile of the impeller.

Abstract: A method of fabricating a nozzle vane comprising a vane portion and axle portions that project out from predetermined end faces of the vane portion, the method including: a first process that molds the axle portions by inserting pre-molding axle portions of a fabricated member having a pre-molding vane portion and pre-molding axle portions with dimensions respectively approximating the vane portion and the axle portions in axle portion molding dies in which a first insertion portion is formed with a shape that projects the axle portions in the axial direction, and pressing the pre-molding axle portions in the axial direction; and a second process that molds the vane portion by inserting the fabricated member after the first process in a vane portion molding die in which a second insertion portion is formed with a shape that projects the nozzle vane in a direction that is approximately perpendicular to the vane surface of the vane portion, and pressing the pre-molding vane portion in directions approximately p