Method for Checking the Leak Tightness of a Combustion Engine Having an Exhaust Gas Turbocharger, and Exhaust Gas Turbocharger

Patent metadata

Field	Value
Publication number	US-2016011070-A1
Application number	US-201514863737-A
Country	US
Kind code	A1
Filing date	Sep 24, 2015
Priority date	May 27, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

An exhaust gas turbocharger includes a housing having an exhaust gas inlet and an exhaust gas outlet. The exhaust gas turbocharger also has a turbine wheel rotatably mounted in the housing. The exhaust gas turbocharger includes a shut-off device that can adopt both an open and a closed state, a fluid connection existing in the open state and allowing exhaust gas which enters via the exhaust gas inlet to flow to the exhaust gas outlet, bypassing the turbine wheel. When the housing is supplied with compressed air, the exhaust gas turbocharger is at least substantially airtight.

First claim

What is claimed is:

1 . A method for testing leak-tightness of an internal combustion engine before initial commencement of operation, the internal combustion engine being equipped with an exhaust-gas turbocharger, the method comprising the acts of:
sealing off an exhaust tract of the internal combustion engine at a location upstream of the exhaust-gas turbocharger; sealing off a housing of the exhaust-gas turbocharger at an actuation device of a shut-off device of the exhaust-gas turbocharger such that no air can escape from the housing into surroundings of the actuation device; generating a positive pressure in the exhaust-gas turbocharger; and comparing an occurring pressure loss or leakage volume flow with a predefined pressure loss or leakage volume flow.

2 . The method according to claim 1 , wherein the predefined pressure loss or the leakage volume flow defines an acceptable amount of pressure loss or leakage volume flow for the leak-tightness of the internal combustion engine.

3 . An exhaust-gas turbocharger, comprising:
a housing having an exhaust-gas inlet and an exhaust-gas outlet; a turbine wheel mounted rotatably in the housing; and a shut-off device configured to adopt both an open and a closed state, wherein in the open state a fluid connection exists via which exhaust gas passing from the exhaust-gas inlet can flow to the exhaust-gas outlet while bypassing the turbine wheel; and wherein the exhaust-gas turbocharger is sealed off when the housing is charged with compressed air.

4 . The exhaust-gas turbocharger according to claim 3 , wherein the exhaust-gas turbocharger is a substantially air-tight when the housing is charged with compressed air.

5 . The exhaust-gas turbocharger according to claim 3 , wherein
the shut-off device comprises an actuation device, at least one component of the actuation device is arranged within the housing and at least one component is arranged outside the housing, and a sealing device is provided on the actuation device, the sealing device being configured to seal off in a substantially air-tight manner an interior of the housing with respect to an exterior of the housing.

6 . The exhaust-gas turbocharger according to claim 5 , wherein
the shut-off device comprises a shut-off element actuatable via an actuation element of the actuation device that extends through an opening providing in the housing.

7 . The exhaust-gas turbocharger according to claim 6 , wherein
the sealing device bears against the actuation element and against the housing.

8 . The exhaust-gas turbocharger according to claim 6 , wherein
the sealing device bears against the actuation element and against a bearing element fixedly connected to the housing.

9 . The exhaust-gas turbocharger according to claim 8 , wherein the bearing element is formed by a bushing fixedly connected to the housing.

10 . The exhaust-gas turbocharger according to claim 8 , wherein the bearing element is pressed into the housing.

11 . The exhaust-gas turbocharger according to claim 9 , wherein the bearing element is pressed into the housing.

12 . The exhaust-gas turbocharger according to claim 8 , wherein the bearing element and the actuation element each have an encircling groove depression, and
the sealing device is inserted into the groove depressions.

13 . The exhaust-gas turbocharger according to claim 8 , wherein
the bearing element and the actuation element are spaced apart from one another by a gap width, and the gap width forms a groove depression wherein the sealing device is inserted into the groove depression formed by the gap width.

14 . The exhaust-gas turbocharger according to claim 7 , wherein
the sealing device is arranged between an outer circumference of the component of the actuation device arranged outside the housing and an inner circumference of an opening of the housing.

15 . The exhaust-gas turbocharger according to claim 8 , wherein
the sealing device is arranged between an outer circumference of the component of the actuation device arranged outside the housing and an inner circumference of a passage opening provided on the bearing element.

16 . The exhaust-gas turbocharger according to claim 5 , wherein the sealing device has an annular seal.

17 . The exhaust-gas turbocharger according to claim 16 , wherein the annular seal is an O-ring seal.

18 . The exhaust-gas turbocharger according to claim 8 , wherein
the sealing device is arranged on or between a face side of the actuation element and the housing, or on or between a face side of a radially protruding shoulder of the actuation element and a face side of a bearing element fixedly connected to the housing, wherein the sealing device comprises a sealing foil, an O-ring seal, or an elastomer disc.

19 . The exhaust-gas turbocharger according to claim 18 , wherein the actuation element is braced via a clamping element such that the shoulder of the actuation element is pressed against the sealing device.

20 . The exhaust-gas turbocharger according to claim 5 , wherein
the sealing device comprises a seal provided on a new, unused, exhaust-gas turbocharger, the seal being configured to be burned-off during subsequent operation of the exhaust-gas turbocharger due to high temperatures of the exhaust-gas.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Marek Reinhard
• Stoeckl Stefan
• Angerer Tim

Classifications

• F02B33/40

  of non-positive-displacement type · CPC title

• F02B37/186

  Arrangements of actuators or linkage for bypass valves · CPC title

• G01M3/025 Primary

  Details with respect to the testing of engines or engine parts · CPC title

• G01M15/04 Primary

  Testing internal-combustion engines · CPC title

• F01D17/105

  by passing part of the fluid · CPC title