Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1991-05-15
1993-02-16
Miller, Carl S.
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
123449, F02M 3900
Patent
active
051861437
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is directed to a distribution type fuel injection pump for internal combustion engines.
In such distributor type fuel injection pumps an exciting signal derived from the operating conditions of the internal combustion engine, such as speed, accelerator pedal position, inlet manifold pressure, temperature, air pressure etc., is transmitted to the rotary magnet regulator, which signal effects a corresponding rotation of the rotating armature and hence a predetermined setting of the control member constructed as a sliding bush on the pump plunger. The rotational position of the rotating armature is detected by a potentiometer, the output signal of which represents the instantaneous value signal of the control member transmitted to the regular device. A damping device for the rotating armature is provided in order to prevent rotary oscillations of the rotating armature which can cause malfunction of the driving operation to the point of stoppage of the internal combustion engine.
In a known fuel injection pump of the above mentioned type (U.S. Pat. No. 4,465,044) the damping device comprises of a damping cylinder in which a damping plunger is translatably guided in an axial direction. The damping plunger has a throttle hole passing through it by which the inside of the damping cylinder filled with fuel is connected to the chamber containing the rotary magnet regulator. The damping plunger is linked by a connecting rod to an arm which is joined firmly to the rotating armature so that it performs a corresponding translational movement when there is a rotary movement of the rotating armature. Due to the fact that during the displacement of the damping plunger, the volume of fuel enclosed by it in the damping cylinder can only be equalised through the throttle area, the rotation of the rotating armature takes place against a resistance depending on the size of the throttle area, as a result of which rapid rotary movements of the rotating armature are suppressed.
ADVANTAGES OF THE INVENTION
The fuel injection pump in accordance with the invention, has the advantage that an effective damping device for the rotating armature is obtained by simple means. At the same time a travel of swing of the paddle is available which is relatively large in relation to the regulating travel of the control member. The damping device in accordance with the invention has an extremely low sensitivity to jamming and to dirt. Due to the very good damping effect of the damping device in accordance with the invention it is possible to increase the regulator amplification resulting in a better low-level signal behaviour of the rotating armature.
DRAWING
The invention is explained in greater detail in the subsequent description, by means of a pictorially presented embodiment. The following are shown:
FIG. 1 a cut-away longitudinal section of a fuel injection pump for an internal combustion engine along line I--I in FIG. 2, and
FIG. 2 a top view of the rotary magnet regulator of the fuel injection pump in FIG. 1, with the housing cover removed.
DESCRIPTION OF THE EMBODIMENT
In the distributor type fuel injection pump for internal combustion engines shown in cut-away longitudinal section in FIG. 1 only those parts necessary for the understanding of the invention are represented.
Of the fuel injection pump, a distributor plunger marked 10 actuated in an axial and rotating motion and guided in a pump cylinder 11 in a pump housing marked 17 is indicated. The distributor plunger 10 confines within the pump cylinder 11 in a known manner, a pump operating chamber which, in the course of the stroke of the distributor plunger 10, is connected through an inlet hole to, and again separated from, a volume of fuel inside the pump housing 17. In the course of the stroke of the distributor plunger 10 fuel is thereby drawn from the fuel volume and delivered during the rotary movement through a distributor hole into distributor channels leading to injection nozzles. The pump operating chamber is connected through an ax
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Greigg Edwin E.
Greigg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
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