# US 2014/0154055 A1 · Turbocharger

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- Number: US 2014/0154055 A1
- Document ID: US20140154055A1
- Status: Published application
- Kind: A1
- Application number: 14/235,538
- Filed: 2012-07-24
- Published: 2014-06-05
- Earliest claimed: 2011-08-08
- Assignees: BorgWarner Inc.
- Inventors: Thomas Ramb; Dietmar Metz
- Web page: https://patentgrep.com/patent/US20140154055A1

## CPC

- F01D 17/165: {for radial flow, i.e. the vanes turning around axes which are essentially parallel to the rotor centre line (F01D17/167 takes precedence)}
- F02B 37/24: by using pumps or turbines with adjustable guide vanes
- F05D 2220/40: in turbochargers
- F05D 2260/50: Kinematic linkage, i.e. transmission of position
- F05D 2260/60: Fluid transfer
- Y02T 10/12: Improving ICE efficiencies
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- 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

A turbocharger (1) with variable turbine geometry (VTG) having a guide grate (18) which surrounds a turbine wheel (4) radially at the outside, which has an adjusting ring (5) operatively connected to the guide blades (7) via associated blade levers (20) which are fastened to blade shafts (8) at one of the ends thereof. Each blade lever (20) has a lever head (23) which can be placed in engagement with an associated engagement recess (24), which has a base wall (26), of the adjusting ring (5), and which has a stop (25) at least for setting the minimum throughflow through the nozzle cross sections formed by the guide blades (7). The stop is a first support point (25) on the base wall (26), wherein, in the minimum throughflow position, the lever head (23) makes contact, via a wall surface (27) facing toward the base wall (26), with said first support point.

## Claims

### Claim 1

A turbocharger (1) with variable turbine geometry (VTG)
a turbine housing (2) with a supply duct (9) for exhaust gases; having
a turbine wheel (4) which is mounted rotatably in the turbine housing (2); and
a guide grate (18)
which surrounds the turbine wheel (4) radially at the outside,
which has a blade bearing ring (6),
which has a multiplicity of guide blades (7) which have in each case one blade shaft (8) mounted in the blade bearing ring (6),
which has an adjusting ring (5) operatively connected to the guide blades (7) via associated blade levers (20) which are fastened to the blade shafts (8) at one of the ends thereof, wherein each blade lever (20) has, at the other end, a lever head (23) which can be placed in engagement with an associated engagement recess (24), which has a base wall (26), of the adjusting ring (5), and
which has a stop (25) at least for setting the minimum throughflow through the nozzle cross sections formed by the guide blades (7),
wherein the stop is a first support point (25) on the base wall (26), wherein, in the minimum throughflow position, the lever head (23) makes contact, via a wall surface (27) facing toward the base wall (26), with said first support point.

### Claim 2 (depends on 1)

The turbocharger as claimed in claim 1, wherein a further stop in the form of a second support point (28) on the base wall (26) is provided, wherein in a maximum throughflow position, the lever head (23) makes contact, via the wall surface (27) facing toward the base wall (26), with said second support point.

### Claim 3 (depends on 2)

The turbocharger as claimed in claim 2, wherein the first and second support points (25, 28) are arranged symmetrically with respect to a radius line (R) running through a central point (M8) of the blade shaft (8H) which is assigned to the lever head (23).

### Claim 4 (depends on 1)

The turbocharger as claimed in claim 1, wherein, in an intermediate blade position (STM), there is play (S) between the base wall (26) and the wall surface (27), which points toward said base wall (26), of the lever head (23).