Compressor seal assembly for a turbocharger

1. A compressor seal assembly, comprising:

a seal ring having a seal ring bore; the seal ring including a front seal face; a rear seal face opposite the front seal face, and a seal ring groove disposed circumferentially on the rear seal face, the seal ring groove extending from the rear seal face towards the front seal face; and

a collar, including:

a cap portion having a first bore configured to receive an impeller, the cap portion being disposed in the seal ring bore;

a journal portion having a second bore configured to receive a shaft connectable to the impeller; and

a slinger disposed between the cap portion and the journal portion, the slinger having a generally cylindrical shape and including:

a front face disposed adjacent the rear seal face of the seal ring, the front face being separated from the rear seal face by an axial gap;

a rear face opposite the front face;

a cylindrical side surface extending between the front face and the rear face; and

a first slinger groove disposed on the side surface, and including a lip adjacent the rear face, the lip extending in a radial direction; a shroud extending from a shroud root on the slinger to a distal end at a first angle relative to the front face; and a groove surface disposed between the lip and the distal end, the shroud extending into the seal ring groove and covering the axial gap.

2. The compressor seal assembly of claim 1 , wherein the collar further includes a second slinger groove disposed circumferentially on the front face, the second slinger groove extending from the front face towards the rear face.

3. The compressor seal assembly of claim 2 , wherein the second slinger groove extends into the slinger at a second angle relative to the front face.

4. The compressor seal assembly of claim 3 wherein the shroud is disposed between the first slinger groove and the second slinger groove.

5. The compressor seal assembly of claim 1 , wherein the seal ring groove extends into the seal ring at an angle relative to the rear seal face.

6. The compressor seal assembly of claim 1 , wherein the seal ring bore has a plurality of projections, the projections being axially spaced from each other and extending radially inwards from a surface of the seal ring bore.

7. The compressor seal assembly of claim 6 , wherein an outer surface of the cap portion is separated from the projections by an annular gap.

8. A collar, comprising:

a cap portion having a first bore configured to receive an impeller;

a journal portion having a second bore configured to receive a shaft connectable to the impeller; and

a slinger disposed between the cap portion and the journal portion, the slinger having a generally cylindrical shape and including:

a front face;

a rear face opposite the front face;

a circumferential side surface extending between the front face and the rear face; and

a first slinger groove disposed on the side surface, and including a first lip adjacent the rear face, the first lip extending in a radial direction; a shroud extending generally axially from a shroud root on the slinger to a distal end adjacent the front face; and a first groove surface disposed between the first lip and the distal end; and

a second slinger groove disposed circumferentially on the front face, the second groove extending from the front face towards the rear face, and including a second lip disposed on the rear face, the second lip extending in a radial direction; the shroud; and a second groove surface disposed between the second lip and the distal end, and wherein the shroud protrudes axially from the front face a greater distance than the second lip.

9. The collar of claim 8 , wherein the shroud extends at an angle relative to a rotational axis of the collar.

10. The collar of claim 8 , wherein the first slinger groove surface has a concave shape facing radially outwards relative to a rotational axis of the collar.

11. The collar of claim 8 , wherein the second slinger groove extends into the slinger at an angle relative to the front face.

12. The collar of claim 8 , wherein the first bore has a first diameter larger than a second diameter of the second bore.

13. The collar of claim 8 , wherein

the cap portion is generally cylindrical and has a first outer diameter, and

the journal portion is generally cylindrical and has a second outer diameter smaller than the first outer diameter.

14. The collar of claim 13 , wherein the slinger has a third outer diameter larger than the first outer diameter.

15. The compressor seal assembly of claim 1 , wherein the first bore has a first diameter larger than a second diameter of the second bore.

16. The compressor seal assembly of claim 2 , wherein the second slinger groove includes a second lip disposed on the rear face, the second lip extending in a radial direction; the shroud; and a second groove surface disposed between the second lip and the distal end, and wherein the shroud protrudes axially from the front face a greater distance than the second lip.

17. The compressor seal assembly of claim 3 , wherein the first angle is equal to the second angle.

18. A turbocharger, comprising:

a shaft including a impeller attachment end;

a compressor impeller with a shaft attachment end, the shaft attachment end including a shaft bore, the impeller attachment end fixedly disposed within the shaft bore; and

a compressor seal assembly, including a seal ring having a seal ring bore; and a collar including a cap portion, a journal portion, and a slinger; and

wherein:

the cap portion is disposed in the seal ring bore and includes a first bore, and the impeller attachment end is disposed in the first bore;

the journal portion includes a second bore and the a portion of the shaft is disposed in the second bore; and

the slinger is disposed between the cap portion and the journal portion, has a generally cylindrical shape and includes a front face, a rear face opposite the front face, a cylindrical side surface extending between the front face and the rear face, and a first slinger groove disposed on the side surface.

19. The turbocharger of claim 18 , wherein:

the seal ring includes a front seal face; a rear seal face opposite the front seal face, and a seal ring groove disposed circumferentially on the rear seal face, the seal ring groove extending from the rear seal face towards the front seal face;

the front face is disposed adjacent the rear seal face of the seal ring, the front face being separated from the rear seal face by an axial gap; and

the first slinger groove includes a lip adjacent the rear face, the lip extending in a radial direction; a shroud extending from a shroud root on the slinger to a distal end at a first angle relative to the front face; and a groove surface disposed between the lip and the distal end, the shroud extending into the seal ring groove and covering the axial gap.

20. The turbocharger of claim 18 , wherein:

the first slinger groove includes a first lip adjacent the rear face, the first lip extending in a radial direction; a shroud extending generally axially from a shroud root on the slinger to a distal end adjacent the front face; and a first groove surface disposed between the first lip and the distal end; and

the slinger includes a second slinger groove disposed circumferentially on the front face, the second groove extending from the front face towards the rear face, and including a second lip disposed on the rear face, the second lip extending in a radial direction; the shroud; and a second groove surface disposed between the second lip and the distal end, and wherein the shroud protrudes axially from the front face a greater distance than the second lip.