Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1991-01-22
1992-08-18
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123494, 123495, 73119A, F02M 3900
Patent
active
051389975
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a fuel injection pump comprising at least one pump plunger moved by a cam drive formed of a substantially stationary part and of a rotating part driven by a drive shaft. One of the parts has a cam track with several elevations, and another of the parts is rotated relative to the one part by an adjustment device to coordinate the stroke of the pump plunger. A control device controls fuel injection and includes a radial position transmitter having a first transmitter part coupled with the stationary part of the cam drive, and second transmitter parts arranged on the drive shaft or on a part firmly connected in the direction of rotation with the drive shaft.
Such a fuel injection pump is already known from DE-OS 33 36 871. This fuel injection pump has a pump and, distributor plunger as well as a cam plate which imparts to this plunger a rotary lifting movement. The cam plate which is firmly connected in the direction of rotation to a drive shaft receives its lifting movement as a result of rolling contact between face cams on the cam plate and rollers of a stationary roller ring. For the purpose of detecting an angular rotational position and the speed of drive shaft, the fuel injection pump is provided with a rotation transmitter which has marks at the periphery of a part rotating synchronously with the drive shaft and a detector which scans these marks. The detector is fastened to the roller ring which can be rotated by an injection adjusting device for the purpose of adjusting the time of injection. The roller ring and the drive shaft do not bear against each other so that the two parts can make uncontrolled movements relative to each other which are superimposed on the actual rotating movement and thereby falsify the measurement result.
SUMMARY OF THE INVENTION
The object of the invention is a fuel injection pump in which the invention with the uncontrolled relative movements between the rotatable part of the cam drive and the drive shaft are eliminated, and a high degree of accuracy of detection of the speed and the radial position of the drive shaft is achieved. The object of the invention is achieved by providing a bearing between these two parts.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of the preferred embodiments when read with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWING
The single FIGURE of the drawing shows a longitudinal cross-sectional view of the fuel injection pump according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The figure shows a fuel injection pump of the distributor type for a Diesel internal combustion engine. A drive shaft 11 is supported in a bearing in housing 10 of the fuel injection pump. This drive shaft is coupled with a cam plate 12 arranged at a right angle to the axis of the drive shaft 11 and carrying as a part of a cam drive a cam track 13 with face cam elevations 14. The bearing surface of the cam plate 12 runs on rollers 16 which are held in a roller ring 17 also belonging to the cam drive. The drive is fitted in a cylindrical recess in the housing so that it can rotate and is firmly supported axially relative to the housing by a bottom part of the recess.
The cam plate 12 performs a rotary lifting movement due to the rotationally fixed connection of the cam plate 12 and the drive shaft 11 and due to the rolling of the face cams 14 on the rollers 16.
A pump and distributor plunger, hereinafter referred to briefly as pump plunger 21, sliding in a cylindrical hole 18 of a cylindrical block 19 is coupled with the cam plate 12 and likewise performs a rotary lifting movement. An operating chamber 23 of the pump in the cylindrical block 19 is limited, on one hand, by the pump plunger 21 and on the other hand, by a solenoid valve 22 set in the cylindrical block 19. The operating chamber 23 of the pump can be connecte
REFERENCES:
patent: 3758241 (1973-09-01), Eheim
patent: 4200074 (1980-04-01), Kosuda
patent: 4367714 (1983-01-01), DiDomenico
patent: 4470763 (1984-09-01), Yasuhara
patent: 4561398 (1985-12-01), Roca Nierga
patent: 4603669 (1986-08-01), Takemoto
patent: 4656990 (1987-04-01), Miyaki
Miller Carl S.
Robert & Bosch GmbH
Striker Michael J.
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