Fuel injection pump for internal combustion engines

Details Fuel injection pump for internal combustion engines Fuel injection pump for internal combustion engines

1991-04-01

1993-04-27

Miller, Carl S.

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

123503, 123494, F02D 3100

Patent

active

052052567

DESCRIPTION:

BRIEF SUMMARY
SUMMARY OF THE INVENTION

The present invention relates to fuel injection pump for internal combustion engines.
More particularly, it relates to a fuel injection pump which has a pump interior space enclosed by a pump housing and at least one control element arranged in the pump housing, and a displacement pickup assigned to the latter. It is known from DE-OS 31 48 596 to determine the position of a control element arranged in a pump housing by means of a potentiometer pickup. The control element is actuated by an adjusting shaft and the position of the control element is determined via the adjusting shaft by means of the potentiometer pickup. The potentiometer pickup is connected with measuring devices located outside of the pump housing via electrical connection lines. The potentiometer pickup has the disadvantage that it works with mechanical sliding contacts which are subject to wear. In order to be able to operate the potentiometer pickup in a space filled with fuel, special measures are required, e.g. with respect to the selection of work material. It is also very expensive to guide the electrical lines through the pump housing so as to be pressure-tight.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a fuel injection pump for internal combustion engines which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a fuel injection pump in which a stationary electric part of the displacement pickup is arranged on the outside of the pump housing and a movable mechanical part of the displacement pickup is arranged in the pump interior space as a part which is moved by a control element, and the displacement pickup works according to the principle of a measuring process which measures in a contactless manner.
When the fuel injection pump is designed in accordance with the present invention, is has the advantage that the position of the control element is determined by a displacement pickup which works by means of measuring process which measures in a contactless manner and in which, accordingly, no wear occurs in the displacement pickup. The movable part of the displacement pickup arranged in the pump housing can easily be operated in the fuel and, as a result of the measuring process which measures in a contactless manner, need not be connected via electrical connection lines with the pickup stationary part arranged outside the pump housing and having electrical components.
In accordance with another feature of the present invention a quantity adjusting member is arranged in the pump interior spaced for controlling the fuel injection quantity delivered under high pressure by a pump plunger. The quantity adjusting member is adjustable via a shaft which acts at the quantity adjusting member by a driver which is formed on eccentrically at the latter. The movable part is connected with the shaft on the side of the shaft facing the pump housing.
In accordance with still another feature of the present invention, the movable part is connected with the shaft so as to be fixed with respect to rotation relative to it and is arranged at a slight distance from the pump housing. The movable part is constructed as a structural component part which projects on one side eccentrically relative to the longitudinal axis of the shaft and extends parallel relative to the wall of the housing at which the stationary part is externally arranged.
A further feature of the present invention is that the movable part is connected with the shaft via a thread, wherein the movable part is arranged in the pump housing so a to be secured against rotation relative to it and projects with a pin-like projection into a cup-shaped portion of the pump housing on which the stationary part is externally arranged.
A further feature of the present invention is that the movable part is connected with the shaft via another driver which is attached eccentrically to th

REFERENCES:
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patent: 4212279 (1980-07-01), Ohtani
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patent: 4380221 (1983-04-01), Eheim
patent: 4393835 (1983-07-01), Eheim
patent: 4425889 (1984-01-01), Hachitani
patent: 4461255 (1984-07-01), Eheim
patent: 4465044 (1984-08-01), Yasuhara
patent: 4506545 (1985-03-01), Yamada
patent: 4531491 (1985-07-01), Iiyama

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