Turbocharger

• US 9,963,983 B2
• Filed: 12/17/2014
• Issued: 05/08/2018
• Est. Priority Date: 06/29/2012
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Velthuis, Jan
• Primary Examiner(s): Edgar, Richard
• Application Number:
  US14/573,650
• Publication Number:
  US 20150104303A1
• Time in Patent Office: 1,238 Days
• CPC Class Codes: F01D 25/24 Casings modified for heating or cooling F01D25/14; Casing parts, e.g. diaphragms, casing fastenings casings for rotary machines or engines in general F16M ; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045
• CPC Class Codes: F01D 25/246 Fastening of diaphragms or stator-rings
• CPC Class Codes: F01D 9/04 forming ring or sector
• CPC Class Codes: F02B 37/025 Multiple scrolls or multiple gas passages guiding the gas to the pump drive
• CPC Class Codes: F02B 39/00 Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
• CPC Class Codes: F02C 6/12 Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
• CPC Class Codes: F04D 25/04 the pump being fluid-driven pumps driven by exhaust gases F02B37/00, F02B39/00; turbochargers F02C6/12
• CPC Class Codes: F04D 29/4206 especially adapted for elastic fluid pumps
• CPC Class Codes: F04D 29/441 especially adapted for elastic fluid pumps
• CPC Class Codes: F04D 29/547 having a special shape in order to influence fluid flow
• CPC Class Codes: F04D 29/624 especially adapted for elastic fluid pumps
• CPC Class Codes: F05D 2220/40 in turbochargers

Abstract

A turbocharger for an internal combustion engine having a housing, an impeller arranged in the housing interior having an impeller shaft and being mounted in a bearing block, and an intermediate element between the impeller and the bearing block. The housing includes at least one flow channel for feeding or discharging a fluid to or from the impeller, and the intermediate element includes a wall section that delimits a least a section of at least one of the flow channels.

Claims

1. An exhaust gas turbocharger for an internal combustion engine, comprising:

a housing having a housing interior that is at least partially enclosed by the housing;

an impeller with an impeller shaft disposed in the housing interior and rotatably mounted in a bearing block; and

an intermediate element arranged coaxially to the impeller shaft, the intermediate element having a bearing block side axially adjacent to the bearing block, an impeller side axially adjacent to the impeller, and a crucible-shaped wall portion extending axially between the impeller side and the bearing block side,

wherein

the housing includes at least one flow channel configured to supply fluid to, or discharge fluid from, the impeller,

a radially outer flange at the bearing block side of the intermediate element is axially fixed between an axial stop surface of the housing and an axial stop surface of the bearing block,

at least one of the housing and the bearing block axially overlaps the intermediate element flange in a region radially outside the intermediate element flange,

the housing and the bearing block have adjacent axially-opposed faces in the region radially outside the intermediate element flange, and

at the impeller side of the intermediate element at least a section of the intermediate element forms an impeller-side wall delimiting at least a section of at least one of the at least one flow channels having an outer radius smaller than an inner radius of the axial stop surface of the housing at the bearing block side of the intermediate element.

2. The exhaust gas turbocharger according to claim 1, wherein

the impeller-side wall of the intermediate element has a disk-shaped extension extending substantially radially to the impeller shaft forming the wall.

3. The exhaust gas turbocharger according to claim 2, wherein

the disk-shaped extension has an outer diameter larger than an outer diameter of the impeller.

4. The exhaust gas turbocharger according to claim 3, wherein

the disk-shaped extension has an outer diameter larger than an inner diameter of a partition of at least one of the at least one flow channels.

5. An exhaust gas turbocharger according to claim 4, wherein

each of the at least one flow channels has a spiral shape and is aligned in a plane oriented substantially radially to the impeller shaft.

6. An exhaust gas turbocharger according to claim 5, wherein

the intermediate element is configured to be radially positioned on a corresponding radial support surface of the housing.

7. An exhaust gas turbocharger according to claim 4, wherein

the intermediate element is configured for axial insertion into the housing interior such that when fully inserted a section of the disk-shaped extension of the intermediate element is flush with an adjacent wall of the at least one of the at least one flow channels.

8. An exhaust gas turbocharger according to claim 2, wherein

the disk-shaped extension includes a circumferential peripheral seal between the intermediate element and the housing.

9. An exhaust gas turbocharger according to claim 1, wherein

the intermediate element is a shielding element between the impeller and the bearing block.