Magnetic valve controlled injection device

• US 5,007,401 A
• Filed: 09/30/1987
• Issued: 04/16/1991
• Est. Priority Date: 09/30/1986
• Status: Expired due to Term

• Current Assignee: Daimler-Benz AG (Mercedes-Benz Group AG)
• Original Assignee: Daimler-Benz AG (Mercedes-Benz Group AG)
• Inventors: Murwald, Mario, Hoffmann, Karlheinz, Grohn, Michael, Thoma, Frank
• Primary Examiner(s): Miller, Carl Stuart
• Application Number:
  US07/102,711
• Time in Patent Office: 1,294 Days
• Field of Search: 123/509, 123/446, 123/458, 123/495, 123/506, 123/508, 123/470, 123/471, 123/472, 239/600, 417/499, 417/DIG. 1
• US Class Current: 123/509
• CPC Class Codes: F02F 7/006 Camshaft or pushrod housings
• CPC Class Codes: F02M 39/00 Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements fuel-injection apparatus in which injection pumps are driven, or injectors are actuated, by the pressure in engine working cylinders, or by impact of engine working piston F02M49/00; arrangements of injectors F02M61/14
• CPC Class Codes: F02M 59/366 Valves being actuated electrically

Abstract

The invention concerns a magnetic valve controlled fuel injection device for internal combustion engines, in which a fuel pump is driven by a drive element from the cylinder head camshaft and is located separately from a fuel nozzle and connected thereto by a relatively short exposed injection pipe; and wherein the fuel pump or nozzle forms a structural unit jointly with the magnetic valve, which controls the beginning and end of pumping as a function of operating parameters of the internal combustion engine; and wherein this unit is secured to the cylinder head in such a way that at least one casing part of the aid pump, facing away from the drive element, and the magnetic valve are located outside the space enclosed by the cylinder head and the cylinder head cover.

Claims

1. A magnetic valve controlled fuel injection device comprising:

a fuel pump in a pump casing; and

a fuel nozzle for internal combustion engines;

a mounting means hole for the fuel pump casing in a cylinder head of the engine;

a guide fuel pump piston means in the casing displaceable longitudinally thereof by a camshaft means via a drive element, supported from the cylinder head side;

said pump piston means shutting off a control hole emerging in a pump working space;

a second mounting hole means provided in the cylinder head for the fuel nozzle;

pressure conduit means starting from the pump working space and leading to the fuel nozzle and to a magnetic valve means controlling the beginning of pumping and the end of pumping as a function of operating parameters of the internal combustion engine;

the magnetic valve means forming a structural unit jointly with at least one of the fuel pump and the fuel nozzle;

the first mounting hole means for the pump being provided in the cylinder head;

the pump being located separately from the fuel nozzle and connected to the fuel nozzle by a relatively short exposed pressure pipe means;

the first mounting hole means for the pump allowing for unencumbered removal of the pump from the camshaft means;

the fuel nozzle being independently fastened to the cylinder head by said second hole mounting means to be removable towards the outside of the engine; and

a portion of the casing, facing away from the drive element and the magnetic valve means being both located outside the space enclosed by the cylinder head and a cylinder head cover.

2. An injection device according to claim 1, wherein the pump is located to one side of and within a height determined by the length of the fuel nozzle.

3. An injection device according to claim 1, wherein the drive element means is directly driven by the camshaft and comprises a longitudinally displaceable roller tappet.

4. An injection device according to claim 2, wherein the drive element means is directly driven by the camshaft and comprises a longitudinally displaceable roller tappet.

5. An injection device according to claim 1, wherein the drive element means comprises a roller rocker arm and a longitudinally displaceable tappet acting on the pump piston means.

6. An injection device according to claim 2, wherein the drive element means comprises a roller rocker arm and a longitudinally displaceable tappet acting on the pump piston means.

7. An injection device according to claim 1, wherein the pump and magnetic valve means are a singular plug-in unit for insertion in the first mounting hole means in the cylinder head.

8. An injection device according to claim 2, wherein the pump and magnetic valve means are a singular plug-in unit for insertion in the first mounting hole means in the cylinder head.

9. An injection device according to claim 3, wherein the pump and magnetic valve means are a singular plug-in unit for insertion in the first mounting hole means in the cylinder head.

10. An injection device according to claim 4, wherein the pump and magnetic valve means are a singular plug-in unit for insertion in the first mounting hole means in the cylinder head.

11. An injection device according to claim 5, wherein the pump and magnetic valve means are a singular plug-in unit for insertion in the first mounting hole means in the cylinder head.

12. An injection device according to claim 6, wherein the pump and magnetic valve means are a singular plug-in unit for insertion in the first mounting hole means in the cylinder head.

13. An injection device according to claim 1, wherein the casing part, facing away from the drive element means of the pump is closed by a cover acting as a wall boundary for a low pressure side pressure space.

14. An injection device according to claim 2, wherein the casing part, facing away from the drive element means of the pump is closed by a cover acting as a wall boundary for a low pressure side pressure space.

15. An injection device according to claim 1, wherein the pressure pipe means has two ends, one connecting with a fuel supply and the other with a fuel return and with an intermediate connection to a fuel pressure space.

16. An injection device according to claim 2, wherein the pressure pipe means has two ends, one connecting with a fuel supply and the other with a fuel return and with an intermediate connection to a fuel pressure space.

17. An injection device according to claim 1, wherein a low pressure chamber is connected to a portion of the pressure conduit means leading to the magnetic valve means and is controlled by the magnetic valve means.

18. An injection device according to claim 2, wherein a low pressure chamber is connected to a portion of the pressure conduit means leading to the magnetic valve means and is controlled by the magnetic valve means.