# US 2015/0147162 A1 · Exhaust-gas turbocharger

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- Number: US 2015/0147162 A1
- Document ID: US20150147162A1
- Status: Published application
- Kind: A1
- Application number: 14/412,721
- Filed: 2013-07-03
- Published: 2015-05-28
- Earliest claimed: 2012-07-11
- Assignees: BorgWarner Inc.
- Applicants: BorgWarner
- Inventors: Michael Stilgenbauer; Matthias Ruh; Gerald Schall
- Web page: https://patentgrep.com/patent/US20150147162A1

## CPC

- F02B 37/183: {Arrangements of bypass valves or actuators therefor}
- F01D 11/005: {Sealing means between non relatively rotating elements}
- F01D 17/105: {by passing part of the fluid}
- F02B 37/186: {Arrangements of actuators or linkage for bypass valves}
- F05D 2220/40: in turbochargers
- Y02T 10/12: Improving ICE efficiencies
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An exhaust-gas turbocharger (1), with: a turbine housing (2) which has a turbine housing inlet (8) and a turbine housing outlet (9) for exhaust gas, and which has a wastegate duct between the turbine housing inlet (8) and the turbine housing outlet (9), and a flap arrangement (10) comprising a pivotable flap lever (12), a flap plate (11), which is connected to the flap lever (12), for opening and closing the wastegate duct, and having a spring element (17) which is arranged between the flap lever (12) and a disc (18) fastened to the flap plate (11). The spring element (17) has an outer circumferential region (23) which is supported on a sliding contact surface (20), which is of curved form, of the flap lever (12).

## Claims

### Claim 1

An exhaust-gas turbocharger (1) comprising:
a turbine housing (2)
which has a turbine housing inlet (8) and a turbine housing outlet (9) for exhaust gas, and
which has a wastegate duct between the turbine housing inlet (8) and the turbine housing outlet (9), and
a flap arrangement (10) comprising
a pivotable flap lever (12),
a flap plate (11), which is connected to the flap lever (12), for opening and closing the wastegate duct, and
a spring element (17) which is arranged between the flap lever (12) and a disc (18) fastened to the flap plate (11),
wherein
the spring element (17) has an outer circumferential region (23) which is supported on a sliding contact surface (20), which is of curved form, of the flap lever (12).

### Claim 2 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the flap arrangement (10) has a first contact surface (21) on the flap plate (11) and a second contact surface (22), situated opposite the first contact surface (21), on the flap lever (12), wherein the two contact surfaces (21, 22) bear against one another only via a line of contact.

### Claim 3 (depends on 2)

The exhaust-gas turbocharger as claimed in claim 2, wherein the first contact surface (21) is of convex form and the second contact surface (22) is of conical form, wherein the first contact surface (21) is of conical form and the second contact surface (22) is of convex form, wherein the first contact surface (21) is of convex form and the second contact surface (22) is of convex form.

### Claim 4 (depends on 2)

The exhaust-gas turbocharger as claimed in claim 2, wherein the first contact surface (21) is spherical and the second contact surface (22) is conical.

### Claim 5 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the sliding contact surface (20) is spherically curved.

### Claim 6 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the spring element (17) comprises at least three radially projecting spring arms (19) or is in the form of a spherical disc.

### Claim 7 (depends on 6)

The exhaust-gas turbocharger as claimed in claim 6, wherein the spring arms (19) are spherically curved or are of linear or planar form.

### Claim 8 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein a projection (16) of the flap plate (11) extends through a recess (24) in the flap lever (12).

### Claim 9 (depends on 8)

The exhaust-gas turbocharger as claimed in claim 8, wherein the disc (18) is fastened to the projection (16), wherein the spring element (17) is braced between the disc (18) and the flap lever (12).

### Claim 10 (depends on 1)

The exhaust-gas turbocharger as claimed in claim 1, wherein the flap arrangement (10) comprises a flap shaft (13) which is rotatably mounted in the turbine housing (2) in a bushing (28), wherein the flap lever (12) is rotationally conjointly connected to an inner end (25) of the flap shaft (13), and the outer end (26) of the flap shaft (13) is rotationally conjointly connected to a first end (29) of an outside lever (27), which outside lever is connected at its second end (30) to the control rod (14) of an actuator (15).

### Claim 11 (depends on 10)

The exhaust-gas turbocharger as claimed in claim 10, wherein a spring element (17′) is arranged between the outside lever (27) and the bushing (18), wherein the spring element (17′) has an outer circumferential region (23′) which is supported on an end-side sliding contact surface (20′), which is of curved form, of the bushing (28).