Internal-combustion engines – Charge forming device – With fuel pump
Patent
1989-02-13
1990-07-10
Miller, Carl Stuart
Internal-combustion engines
Charge forming device
With fuel pump
123450, 417462, F02M 3900
Patent
active
049400363
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a distribution a fuel injection pump for supplying a plurality of injection nozzles of an internal combustion engine, particularly a diesel internal combustion engine.
In a known fuel injection pump of this type (DE-OS 34 12 834), the control valve is arranged in the fuel inlet, while the distribution bore communicates with a relief opening whose opening and closing during the pump plunger stroke is dependent on the position of an electromagnetically actuated annular slide. The control valve, which is designed as a complete electric valve, is inserted in the pump housing as a separate constructional unit and is connected via bores with a pump work space and with a fuel inlet opening in the pump housing. The control valve and annular slide control the apportioning of the fuel quantity to be injected, wherein the end of injection, as well as the entire fuel delivery range, can be displaced relative to the pump plunger stroke.
In a known fuel injection pump constructed as a pump nozzle for a diesel engine (DE-OS 35 23 536), the control valve is connected between the pump work space and a relief bore. The pump work space is closed and the commencement of delivery of fuel to the injection nozzle is determined by the closing of the control valve. The pressure in the pump work space is reduced in a sudden manner and the fuel delivery is terminated by the opening of the control valve. The control valve, which is also designed in this instance as a complete electric valve, is again inserted in the pump housing as a complete constructional unit and connected via bores with the pump work space, on one side, and with a housing opening for the connection of a fuel return line, on the other side.
SUMMARY OF THE INVENTION
The object of the invention is a fuel injection pump with an extremely reduced dead volume in the pump work space and a low space requirement. This object is achieved by providing a control valve with a valve element integrated in a distributor piston and a valve opening which connects the distribution bore with a relief bore in the distributor piston. Instead of the complete electric valve, there is only a simple electromagnet in the pump housing itself. Bores in the pump housing for the connection of the control valve are dispensed with.
The present invention as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following description with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a longitudinal sectional of a distribution fuel injection pump for a diesel internal combustion engine,
FIG. 2 shows an enlarged view of a control valve and the distributor piston of the fuel injection pump in FIG. 1,
FIG. 3 shows a sectional view of a fuel injection pump according to another embodiment, which section is designated by III in FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A distribution fuel injection pump shown in in FIG. 1 is a radial piston pump for supplying a total of four injection nozzles of a diesel engine with fuel in a preset proportion under an injection pressure. The fuel injection pump comprises a housing 11 which is closed by a housing cover 12 so as to be tight against liquid. A drive shaft 14 is rotatably supported in the housing 11 by a bearing 13. A cover part 15, which projects forward at the housing cover 12 in a hub-like manner, is provided with an axial cylinder bore 16 and a total of four radial bores 17 which are uniformly offset relative to one another in a cross-sectional plane, two of which radial bores 17 can be seen in FIG. 1. A distributor piston 18, which is coupled with the drive shaft 14 so that they are fixed for joint rotation, is supported in the cylinder bore 16. The coupling is effected via coupling elements 19 which engage in a positive-locking manner in grooves in the drive shaft 14, on one side, and in the distributor piston 18, on the other side. The distributor piston 18 is sec
REFERENCES:
patent: 4426983 (1984-01-01), Seilly
patent: 4531491 (1985-07-01), Iiyama
patent: 4552117 (1985-11-01), Djordjeuic
patent: 4604980 (1986-08-01), LeBlanc
patent: 4711618 (1987-12-01), Abinett
patent: 4725209 (1988-02-01), Shirata
patent: 4840162 (1989-06-01), Bruner
Miller Carl Stuart
Robert & Bosch GmbH
Striker Michael J.
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