MOTOR VEHICLE SYSTEM DEVICE AND METHOD FOR OPERATING A MOTOR VEHICLE SYSTEM DEVICE

• US 20130142671A1
• Filed: 11/29/2012
• Published: 06/06/2013
• Est. Priority Date: 12/01/2011
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Matthias Stein, Thomas Steidten
• Inventors: STEIN, Matthias, STEIDTEN, Thomas
• Granted Patent: US 10,428,826 B2
• Time in Patent Office: Days
• US Class Current: 417/53
• CPC Class Codes: F01D 25/16 Arrangement of bearings; Supporting or mounting bearings in casings bearings per se F16C
• CPC Class Codes: F01D 25/22 using working-fluid or other gaseous fluid as lubricant
• 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 13/12 Combinations of two or more pumps combinations with priming pumps or booster pumps to counteract vapour-lock F04D9/04
• CPC Class Codes: F04D 25/062 Details of the bearings
• CPC Class Codes: F04D 25/16 Combinations of two or more pumps ; Producing two or more separate gas flows
• CPC Class Codes: F04D 29/0413 hydrostatic; hydrodynamic thrust bearings
• CPC Class Codes: F04D 29/043 Shafts
• CPC Class Codes: F04D 29/047 hydrostatic; hydrodynamic
• CPC Class Codes: F04D 29/0513 hydrostatic; hydrodynamic thrust bearings
• CPC Class Codes: F04D 29/056 Bearings
• CPC Class Codes: F04D 29/057 hydrostatic; hydrodynamic

Abstract

A motor vehicle system device having a drive assembly, to which a charging device is assigned, has a compressor having at least one compressor runner supported using at least one bearing, the bearing having a stationary first bearing part and a second bearing part that is operatively connected to the compressor runner. An overpressure source is connected to the bearing, using which an overpressure is able to be produced in a bearing gap that is present between the first bearing part and the second bearing part. The overpressure source is the compressor and/or a part of a tandem pump, which besides the overpressure also makes available low air pressure for a user of the motor vehicle system device. The invention also relates to a method for operating a motor vehicle system device.

Claims

1. A motor vehicle system device, comprising:

a drive assembly to which a charging device is assigned, which has a compressor having at least one compressor runner supported using at least one bearing, the bearing having a stationary first bearing part and a second bearing part that is operatively connected to the compressor runner;

wherein an overpressure source is connected to the bearing, using which in a bearing gap that is present between the first bearing part and the second bearing part, an overpressure is able to be produced, the overpressure source being at least one of the compressor and part of a tandem pump, which besides the overpressure also provides low air pressure for a user of the motor vehicle system device.

2. The motor vehicle system device according to claim 1, wherein, in a flow-technological manner, a cross sectional reducing device or a cross sectional adjustment device is provided between the overpressure source and the bearing for setting the overpressure produced in the bearing gap.

3. The motor vehicle system device according to claim 1, wherein the compressor runner is able to be driven by at least one of a turbine of the charging device and an electrical drive device.

4. The motor vehicle system device according to claim 1, wherein the drive assembly is a fuel cell assembly having at least one fuel cell and at least one electric machine fed with electric power by the fuel cell.

5. The motor vehicle system device according to claim 1, wherein the tandem pump is driven electrically.

6. The motor vehicle system device according to claim 1, wherein the bearing is designed as an aerodynamic or aerostatic sliding bearing.

7. The motor vehicle system device according to claim 1, wherein the bearing is at least one of an axial bearing and a radial bearing.

8. The motor vehicle system device according to claim 1, wherein the user is a brake booster.

9. A method for operating the motor vehicle system device according to claim 1, comprising:

in the bearing gap that is present between the first bearing part and the second bearing part, producing an overpressure using the overpressure source in at least one operating state of the charging device, and making available low air pressure for a user of the motor vehicle system device.

10. The method according to claim 9, wherein only in one operating state, in which the rotational speed of the compressor runner is less than a certain minimum rotational speed, the overpressure between the bearing parts is produced using the overpressure source.