HIGH-PRESSURE FUEL PUMP FOR AN INTERNAL COMBUSTION ENGINE

• US 20110209687A1
• Filed: 09/14/2009
• Published: 09/01/2011
• Est. Priority Date: 10/28/2008
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Pfuhl, Berthold, Ropertz, Peter, Schroeder, Bernd
• Application Number:
  US13/126,354
• Publication Number:
  US 20110209687A1
• Time in Patent Office: Days
• US Class Current: 123/459
• CPC Class Codes: F02M 59/46 Valves
• CPC Class Codes: F02M 63/005 Pressure relief valves
• CPC Class Codes: F02M 63/0225 Fuel-injection apparatus having a common rail feeding several injectors F02M63/0003 takes precedence; Means for varying pressure in common rails; Pumps feeding common rails
• CPC Class Codes: F02M 63/0245 between the high pressure pump and the common rail
• CPC Class Codes: F02M 63/0265 Pumps feeding common rails

Abstract

The invention relates to a high-pressure fuel pump for an internal combustion engine with direct injection, comprising a pump housing, a low-pressure region on the intake side, and a high-pressure region on the output side. The high-pressure fuel pump comprises a purely mechanical pressure regulating device for regulating a constant pressure in the high-pressure region.

Claims

1-10. -10. (canceled)

11. A high-pressure fuel pump for an internal combustion engine with direct injection, having:

a pump housing;

a low-pressure region on an inlet side of the hi-pressure fuel pump;

a high-pressure region on an outlet side of the hi-pressure fuel pump; and

a purely mechanical pressure regulating device for regulating a constant pressure in the high-pressure region.

12. The high-pressure fuel pump as defined by claim 11, wherein the mechanical pressure regulating device includes a mechanical pressure regulating valve, in particular a mechanical check valve.

13. The high-pressure fuel pump as defined by claim 11, wherein a throttle restriction is disposed upstream of a valve element of the pressure regulating device.

14. The high-pressure fuel pump as defined by claim 12, wherein a throttle restriction is disposed upstream of a valve element of the pressure regulating device.

15. The high-pressure fuel pump as defined by claim 13, wherein the throttle restriction is embodied in a valve seat housing of the pressure regulating valve and/or in a receiving opening in the pump housing for the pressure regulating device and/or in an inflow conduit to the pressure regulating device.

16. The high-pressure fuel pump as defined by claim 14, wherein the throttle restriction is embodied in a valve seat housing of the pressure regulating valve and/or in a receiving opening in the pump housing for the pressure regulating device and/or in an inflow conduit to the pressure regulating device.

17. The high-pressure fuel pump as defined by claim 11, wherein that the pressure regulating device is disposed in the cylindrical pump housing, in a bore disposed offset from a longitudinal axis of the pump housing.

18. The high-pressure fuel pump as defined by claim 12, wherein that the pressure regulating device is disposed in the cylindrical pump housing, in a bore disposed offset from a longitudinal axis of the pump housing.

19. The high-pressure fuel pump as defined by claim 13, wherein that the pressure regulating device is disposed in the cylindrical pump housing, in a bore disposed offset from a longitudinal axis of the pump housing.

20. The high-pressure fuel pump as defined by claim 15, wherein that the pressure regulating device is disposed in the cylindrical pump housing, in a bore disposed offset from a longitudinal axis of the pump housing.

21. The high-pressure fuel pump as defined by claim 11, further having a connecting bore of the pressure regulating device extending transversely to a longitudinal axis of the pump housing, the connecting bore being disposed between the pressure regulating device and the high-pressure region.

22. The high-pressure fuel pump as defined by claim 20, further having a connecting bore of the pressure regulating device extending transversely to a longitudinal axis of the pump housing, the connecting bore being disposed between the pressure regulating device and the high-pressure region

23. The high-pressure fuel pump as defined by claim 13, wherein the pressure regulating device has a valve spring and/or a sealing diameter between the valve element and a valve seat, by which a limit pressure in the high-pressure region is defined.

24. The high-pressure fuel pump as defined by claim 20, wherein the pressure regulating device has a valve spring and/or a sealing diameter between the valve element and a valve seat, by which a limit pressure in the high-pressure region is defined.

25. The high-pressure fuel pump as defined by claim 11, wherein the pressure regulating device has a cartridgelike valve housing, which is inserted, preferably press-fitted, into a receiving opening of the pump housing.

26. The high-pressure fuel pump as defined by claim 24, wherein the pressure regulating device has a cartridgelike valve housing, which is inserted, preferably press-fitted, into a receiving opening of the pump housing.

27. The high-pressure fuel pump as defined by claim 11, wherein an inlet valve is disposed coaxially to a pump piston of the high-pressure fuel pump.

28. The high-pressure fuel pump as defined by claim 26, wherein an inlet valve is disposed coaxially to a pump piston of the high-pressure fuel pump.

29. The high-pressure fuel pump as defined by claim 11, wherein an outlet of the pressure regulating device communicates with the low-pressure region of the high-pressure fuel pump, in particular with a receiving chamber of a pressure damper.

30. The high-pressure fuel pump as defined by claim 28, wherein an outlet of the pressure regulating device communicates with the low-pressure region of the high-pressure fuel pump, in particular with a receiving chamber of a pressure damper.