Electrically assisted turbocharger

Patent metadata

Field	Value
Publication number	US-9470231-B2
Application number	US-201214368893-A
Country	US
Kind code	B2
Filing date	Dec 21, 2012
Priority date	Jan 6, 2012
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

An electrically assisted turbocharger ( 1 ) comprising a housing ( 3 ) and an electric motor stator ( 22 ) disposed in the housing ( 3 ). The stator ( 22 ) includes a pair of o-rings, or other circumferential seals ( 204, 208 ), disposed therearound. The o-rings ( 204, 208 ) are operative to seal against an interior of the housing ( 3 ) to form an annular chamber ( 130 ) around at least a portion of the stator ( 22 ) and a pair of end cavities ( 122, 126 ) at the axial ends of the stator ( 22 ). The annular chamber ( 130 ) is adapted to allow the circulation of a cooling fluid around the stator ( 22 ). A pair of bearings ( 10, 12 ) may be disposed in the housing ( 3 ), one on each side of the stator ( 22 ). A shaft ( 7 ) is supported in the housing ( 3 ) by the bearings ( 10, 12 ). The shaft ( 7 ) in turn supports a turbine wheel ( 5 ) and a compressor wheel. An electric motor rotor ( 24 ) is disposed on the shaft ( 7 ) between the bearings ( 10, 12 ) and inside the stator ( 22 ).

First claim

The invention claimed is:

1. An electrically assisted turbocharger ( 1 ), comprising:
a housing ( 3 );
an electric motor stator ( 22 ) disposed in the housing ( 3 );
a pair of bearings ( 10 , 12 ) disposed in the housing ( 3 ), one on each side of the stator ( 22 );
a shaft ( 7 ) supported in the housing ( 3 ) by the bearings ( 10 , 12 );
a turbine wheel ( 5 ) and a compressor wheel supported on the shaft ( 7 );
an electric motor rotor ( 24 ) disposed on the shaft ( 7 ) between the bearings ( 10 , 12 ) and inside the stator ( 22 ); and
a pair of collars ( 30 , 32 ) attached to the shaft ( 7 ), each located between the rotor ( 24 ) and a corresponding bearing ( 10 , 12 ), wherein at least one collar ( 30 , 32 ) includes a cylindrical flinger portion ( 308 ) adjacent its corresponding bearing ( 10 , 12 ), a spacer portion ( 304 ) opposite the cylindrical flinger portion ( 308 ), and a ring seal ( 40 ) located between the spacer portion ( 304 ) and the cylindrical flinger portion ( 308 ).

2. The turbocharger ( 1 ) according to claim 1 , further comprising a pair of circumferential seals ( 204 , 208 ) disposed on the stator ( 22 ) and operative to seal against an interior of the housing ( 3 ) to form an annular chamber ( 130 ) around at least a portion of the stator ( 22 ) and a pair of end cavities ( 122 , 126 ) located at axial ends of the stator ( 22 ), wherein the annular chamber ( 130 ) is adapted to facilitate circulation of a cooling fluid around the stator ( 22 ).

3. The turbocharger ( 1 ) according to claim 1 , wherein the cylindrical flinger portion ( 308 ) includes a plurality of radial drains ( 310 ), such that oil entering a recessed region ( 332 ) of the cylindrical flinger portion ( 308 ) from the bearing ( 10 , 12 ) is projected radially outward through the drains ( 310 ).

4. The turbocharger ( 1 ) according to claim 1 , wherein the spacer portion ( 304 ) includes an axially facing locating surface ( 302 ) adapted to abut the rotor ( 24 ), and wherein the cylindrical flinger portion ( 308 ) includes an axially facing surface ( 309 ) adapted to abut a corresponding axial face of the bearing ( 10 , 12 ), thereby axially locating the rotor ( 24 ) and shaft ( 7 ) relative to the bearings ( 10 , 12 ).

5. The turbocharger ( 1 ) according to claim 4 , wherein the spacer portion ( 304 ) includes an axially facing flinger surface ( 312 ) confronting an inner surface ( 123 ) of a corresponding end cavity ( 122 , 126 ), wherein the flinger surface ( 312 ) is operative to direct oil migrating past the ring seal ( 40 ) to travel along the inner surface ( 123 ) of the end cavity ( 122 , 126 ).

6. An electrically assisted turbocharger ( 1 ), comprising:
a housing ( 3 );
an electric motor stator ( 22 ) disposed in the housing ( 3 );
a pair of bearings ( 10 , 12 ) disposed in the housing ( 3 ), one on each side of the stator ( 22 );
a shaft ( 7 ) supported in the housing ( 3 ) by the bearings ( 10 , 12 );
a turbine wheel ( 5 ) and a compressor wheel supported on the shaft ( 7 );
an electric motor rotor ( 24 ) disposed on the shaft ( 7 ) between the bearings ( 10 , 12 ) and inside the stator ( 22 );
a pair of collars ( 30 , 32 ) attached to the shaft ( 7 ), each located between the rotor ( 24 ) and a corresponding bearing ( 10 , 12 ), wherein at least one collar ( 30 , 32 ) includes:
a cylindrical flinger portion ( 308 ) adjacent its corresponding bearing ( 10 , 12 ), the cylindrical flinger portion ( 308 ) including a plurality of radial drains ( 310 ), such that oil entering a recessed region ( 332 ) of the cylindrical flinger portion ( 308 ) is projected radially outward through the drains ( 310 ); and
a spacer portion ( 304 ) opposite the cylindrical flinger portion ( 308 ); and

a seal ( 40 ) located between the spacer portion ( 304 ) and the cylindrical flinger portion ( 308 ).

7. The turbocharger ( 1 ) according to claim 6 , wherein the spacer portion ( 304 ) includes an axially facing locating surface ( 302 ) adapted to abut the rotor ( 24 ), and wherein the cylindrical flinger portion ( 308 ) includes an axially facing surface ( 309 ) adapted to abut a corresponding axial face of the bearing ( 10 , 12 ), thereby axially locating the rotor ( 24 ) and shaft ( 7 ) relative to the bearings ( 10 , 12 ).

8. The turbocharger ( 1 ) according to claim 7 , wherein the spacer portion ( 304 ) includes an axially facing flinger surface ( 312 ) confronting an inner surface ( 123 ) of a corresponding end cavity ( 122 , 126 ), wherein the flinger surface ( 312 ) is operative to direct oil migrating past the seal ( 40 ) to travel along the inner surface ( 123 ) of the end cavity ( 122 , 126 ).

9. The turbocharger ( 1 ) according to claim 6 , further comprising a pair of circumferential seals ( 204 , 208 ) disposed on the stator ( 22 ) and operative to seal against an interior of the housing ( 3 ) to form an annular chamber ( 130 ) around at least a portion of the stator ( 22 ), wherein the annular chamber ( 130 ) is adapted to facilitate circulation of a cooling fluid around the stator ( 22 ).

10. An electrically assisted turbocharger ( 1 ), comprising:
a housing ( 3 );
an electric motor stator ( 22 ) disposed in the housing ( 3 );
a pair of circumferential seals ( 204 , 208 ) disposed on the stator ( 22 ) and operative to seal against an interior of the housing ( 3 ) to form an annular chamber ( 130 ) around at least a portion of the stator ( 22 ) and a pair of end cavities ( 122 , 126 ) located at axial ends of the stator ( 22 );
a pair of bearings ( 10 , 12 ) disposed in the housing ( 3 ), one on each side of the stator ( 22 );
a shaft ( 7 ) supported in the housing ( 3 ) by the bearings ( 10 , 12 );
a turbine wheel ( 5 ) and a compressor wheel supported on the shaft ( 7 );
an electric motor rotor ( 24 ) disposed on the shaft ( 7 ) between the bearings ( 10 , 12 ) and inside the stator ( 22 ); and
a pair of collars ( 30 , 32 ) attached to the shaft ( 7 ), each located between the rotor ( 24 ) and a corresponding bearing ( 10 , 12 ), wherein at least one collar ( 30 , 32 ) includes:
a cylindrical flinger portion ( 308 ) adjacent a corresponding bearing ( 10 , 12 ), including:
a plurality of radial drains ( 310 ), such that oil entering a recessed region ( 332 ) of the cylindrical flinger portion ( 308 ) from the bearing ( 10 , 12 ) is projected radially outward through the drains ( 310 ); and
an axially facing surface ( 309 ) adapted to abut a corresponding axial face of the bearing ( 10 , 12 ), thereby axially locating the rotor ( 24 ) and shaft ( 7 ) relative to the bearings ( 10 , 12 ); and

a spacer portion ( 304 ) opposite the cylindrical flinger portion ( 308 ) including an axially facing locating surface ( 302 ) adapted to abut the rotor ( 24 ); and
a piston ring ( 40 ) located between the spacer portion ( 304 ) and the cylindrical flinger portion ( 308 ).

11. The turbocharger ( 1 ) according to claim 10 , wherein the annular chamber ( 130 ) is adapted to facilitate circulation of a cooling fluid around the stator ( 22 ).

12. The turbocharger ( 1 ) according to claim 10 , wherein the circumferential seals ( 204 , 208 ) comprise o-rings.

13. The turbocharger ( 1 ) according to claim 10 , wherein the spacer portion ( 304 ) includes an axially facing flinger surface ( 312 ) confronting an inner surface ( 123 ) of a corresponding end cavity ( 122 , 126 ), wherein the flinger surface ( 312 ) is operative to direct oil migrating past the piston ring ( 40 ) to travel along the inner surface ( 123 ) of the end cavity ( 122 , 126 ).

Assignees

• Borgwarner Inc

Inventors

• Diemer Paul
• Cavagnaro Augustine
• Bucking Michael

Classifications

• H02K9/19

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• F04D13/06 Primary

  the pump being electrically driven · CPC title

• F02B37/10

  at least one pump being alternatively {or simultaneously} driven by exhaust and other drive, {e.g. by pressurised fluid from a reservoir or an engine-driven pump} · CPC title

• F01D15/10

  Adaptations for driving, or combinations with, electric generators · CPC title

• Y02T10/144

  Cross-Sectional Technologies · mapped topic