Exhaust additive dosing system comprising a turbocharger

Patent metadata

Field	Value
Publication number	US-11725559-B2
Application number	US-202017783313-A
Country	US
Kind code	B2
Filing date	Nov 26, 2020
Priority date	Dec 12, 2019
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

Disclosed is a turbocharger for an internal combustion engine comprising a turbine having a turbine housing and a diffusor. The turbine housing comprises an exhaust gas outlet volume, and the diffusor is arranged in this volume. A housing orifice and a diffusor orifice are arranged through each of the turbine housing and diffusor respectively and are mutually aligned to provide an opening into the exhaust gas outlet volume. The turbocharger further comprises a bushing arranged within the housing orifice and extending towards the diffusor orifice and ending at a first end in association with the diffusor orifice. The first end of bushing has an internal diameter that is greater than or equal to a diameter of the diffusor orifice.

First claim

The invention claimed is:

1. An exhaust additive dosing system for an exhaust system for an internal combustion engine, the exhaust additive dosing system comprising:
a turbocharger comprising a turbine, wherein the turbine comprises:
a diffusor;
a turbine housing comprising an exhaust gas outlet volume, and the diffusor is arranged in the exhaust gas outlet volume, wherein a housing orifice and a diffusor orifice are arranged through each of the turbine housing and diffusor respectively, and wherein the housing orifice and diffusor orifice are mutually aligned to provide an opening into the exhaust gas outlet volume; and
a bushing arranged within the housing orifice extending towards the diffusor orifice and ending at a first end in association with the diffusor orifice, and wherein the first end of the bushing has an internal diameter that is greater than or equal to a diameter of the diffusor orifice; and

an exhaust additive metering device comprising:
a dosing pipe arranged to supply exhaust additive to the exhaust gas outlet volume of the turbocharger, wherein the dosing pipe comprises a surface arranged to sealably interact with a surface of the bushing.

2. The exhaust additive dosing system according to claim 1 , wherein the diffusor comprises an orifice collar arranged to partially or fully encircle the diffusor orifice and arranged to interface with an outer wall of the bushing.

3. The exhaust additive dosing system according to claim 2 , wherein the orifice collar is arranged to provide a labyrinth seal between the diffusor and the first end of the bushing.

4. The exhaust additive dosing system according to claim 1 , further comprising a sealing element arranged to provide a seal between the diffusor and the first end of the bushing.

5. The exhaust additive dosing system according to claim 3 , wherein the sealing element is adapted to provide a labyrinth seal between the diffusor and the bushing.

6. The exhaust additive dosing system according to claim 1 , further comprising a distribution device arranged on a shaft, hub or rotor of the turbine.

7. The exhaust additive dosing system according to claim 6 , wherein the distribution device is manufactured integrally with the shaft, hub or rotor of the turbine.

8. The exhaust additive dosing system according to claim 1 , wherein the bushing is manufactured of stainless steel.

9. The exhaust additive dosing system according to claim 1 , wherein the turbine housing is manufactured of cast iron.

10. The exhaust additive dosing system according to claim 1 , wherein the bushing comprises a bushing flange arranged at a second end of the bushing, the second end being arranged opposite to the first end.

11. The exhaust additive dosing system according to claim 10 , wherein the bushing flange is adapted at a first face to interface with the turbine housing such that displacement of the bushing further into the exhaust gas outlet volume is prevented.

12. The exhaust additive dosing system according to claim 10 , wherein the dosing pipe comprises a pipe flange arranged to sealably interact with a second face of the bushing flange, the second face of the bushing flange being arranged opposite the first face of the bushing flange.

13. The exhaust additive dosing system according to claim 1 , wherein the exhaust additive dosing system further comprises a distribution device arranged on a shaft, hub, or rotor of the turbine, and wherein the exhaust additive metering device is arranged to supply exhaust additive to the exhaust additive distribution device.

14. A vehicle, comprising an exhaust additive dosing system comprising:
a turbocharger comprising a turbine, wherein the turbine comprises:
a diffusor;
a turbine housing comprising an exhaust gas outlet volume, and the diffusor is arranged in the exhaust gas outlet volume, wherein a housing orifice and a diffusor orifice are arranged through each of the turbine housing and diffusor respectively, and wherein the housing orifice and diffusor orifice are mutually aligned to provide an opening into the exhaust gas outlet volume; and
a bushing arranged within the housing orifice extending towards the diffusor orifice and ending at a first end in association with the diffusor orifice, and wherein the first end of the bushing has an internal diameter that is greater than or equal to a diameter of the diffusor orifice; and

an exhaust additive metering device comprising:
a dosing pipe arranged to supply exhaust additive to the exhaust gas outlet volume of the turbocharger, wherein the dosing pipe comprises a surface arranged to sealably interact with a surface of the bushing.

15. The vehicle according to claim 14 , wherein the diffusor of the exhaust additive dosing system comprises an orifice collar arranged to partially or fully encircle the diffusor orifice and arranged to interface with an outer wall of the bushing.

16. The vehicle according to claim 15 , wherein the orifice collar is arranged to provide a labyrinth seal between the diffusor and the first end of the bushing.

17. The vehicle according to claim 14 , wherein the exhaust additive dosing system further comprises a sealing element arranged to provide a seal between the diffusor and the first end of the bushing.

18. The vehicle according to claim 17 , wherein the sealing element is adapted to provide a labyrinth seal between the diffusor and the bushing.

19. The vehicle according to claim 14 , wherein the exhaust additive dosing system further comprises a distribution device arranged on a shaft, hub or rotor of the turbine.

20. The vehicle according to claim 19 , wherein the distribution device is manufactured integrally with the shaft, hub or rotor of the turbine.

Assignees

• Scania Cv Ab

Inventors

• Gawell Anders
• Olsson Viktor
• Lindgren Magnus

Classifications

• F01N3/206 Primary

  Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents · CPC title

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title

• F01N13/141

  Double-walled exhaust pipes or housings · CPC title

• F01N13/1838

  characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles · CPC title

• F02B37/00 Primary

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