Turbocharger

Patent metadata

Field	Value
Publication number	US-2016273548-A1
Application number	US-201615071418-A
Country	US
Kind code	A1
Filing date	Mar 16, 2016
Priority date	Mar 18, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

A turbocharger includes a cooling passage. The cooling passage is arranged along a diffuser surface, which faces a diffuser passage in a compressor housing member. The compressor housing member is constituted by combining a first piece, a second piece, and a third piece, which are produced by die casting or the like. The cooling passage is defined by assembling the first piece and the second piece to each other.

First claim

1 . A turbocharger comprising:
a compressor housing member having a compressor chamber; a compressor impeller accommodated in the compressor chamber; a diffuser passage, which communicates with the compressor chamber and has a shape surrounding the compressor chamber; a diffuser surface, which faces the diffuser passage; and a cooling passage, which extends along the diffuser surface, wherein a fluid for cooling the diffuser surface flows through the cooling passage, wherein the compressor housing member includes a plurality of pieces, which are assembled to each other, and the cooling passage is defined by the pieces, which are assembled to each other.

2 . The turbocharger according to claim 1 , wherein
the compressor housing member includes
the compressor chamber,
an intake port, which extends in an axial direction of the compressor impeller and communicates with the compressor chamber, and
a compressor scroll passage, which surrounds the compressor impeller, communicates with an outer peripheral portion of the diffuser passage, and has a spiral shape,
the pieces include
a first piece, which defines the compressor chamber, the diffuser passage, and the compressor scroll passage, and
a second piece, which defines the intake port,
the first piece has a recess, which has an opening along the cooling passage to define the cooling passage, the second piece includes a closing portion that closes the recess, and the first piece and the second piece are assembled to each other in the axial direction of the compressor impeller to close the recess with the closing portion, so that the cooling passage is defined.

3 . The turbocharger according to claim 1 , comprising a thermal insulation layer provided in the compressor housing member, wherein
the thermal insulation layer is located between the cooling passage and the compressor chamber in a view of a radial direction that intersects an axial direction of the compressor impeller at right angles, and the thermal insulation layer has a shape that surrounds the compressor chamber.

4 . The turbocharger according to claim 1 , wherein the pieces include a piece that defines the cooling passage and the diffuser surface.

5 . The turbocharger according to claim 1 , wherein the fluid is coolant of a vehicle-mounted internal combustion engine.

6 . The turbocharger according to claim 1 , wherein
the compressor housing member includes
the compressor chamber,
an intake port, which extends in an axial direction of the compressor impeller and communicates with the compressor chamber, and
a compressor scroll passage, which surrounds the compressor impeller, communicates with an outer peripheral portion of the diffuser passage, and has a spiral shape,
the pieces include
a cylindrical first piece, which defines the compressor scroll passage,
a cylindrical second piece, which defines the compressor chamber and the diffuser passage,
a third piece, wherein the first piece and the third piece together define the compressor scroll passage, and
a cylindrical fourth piece, which defines the intake port,
the first piece has a recess, which has an opening along the cooling passage to define the cooling passage, the second piece includes a passage-defining flange, which supports the first piece and closes the recess, and an inner circumferential surface having an internal thread portion, and the fourth piece includes an external thread portion, which is configured to be threaded to the internal thread portion, and a flange, wherein the flange and the passage-defining flange together hold the first piece.

Assignees

• Toyota Jidoshokki Kk
• Toyota Motor Co Ltd

Inventors

• Uesugi Tsuyoshi
• Yonezawa Koichi

Classifications

• F04D29/5853

  heat insulation or conduction · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F02B37/00

  Engines characterised by provision of pumps driven at least for part of the time by exhaust · CPC title

• F04D29/584

  cooling or heating the machine (F04D29/5846, F04D29/5853 take precedence) · CPC title

• F05D2230/21

  by casting · CPC title