Fuel injection pump for internal combustion engines

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

1991-11-22

1993-08-10

Miller, Carl S.

Internal-combustion engines

Engine speed regulator

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

12317917, 123373, F02M 3900

Patent

active

052339572

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates a fuel injection pump for internal combustion engines. More particularly, the present invention relates to a fuel injection pump for internal combustion engines which has a fuel-quantity adjusting member and an associated adjusting device for altering the possible travel of the fuel-quantity adjusting member as a function of the atmospheric pressure.
Such a fuel injection pump has already been disclosed in German Offenlegungsschrift 3,430,141. This fuel injection pump has a stop lever which is adjustable via a transmission device by a pneumatic actuator as a function of the atmospheric pressure and against which a speed lever of the fuel injection pump. The speed lever serves as a fuel-quantity adjusting member, comes to rest at full load. The pneumatic actuator here comprises two diaphragm cells which are connected in series and change in length as a function of the atmospheric pressure. This change in length is transmitted to the stop lever via the transmission device, which has two discs coupled to one another in such a way that they can be dragged along. Assigned to the transmission device is a locking mechanism which locks the said device counter to the action of the force of the stop lever. The overall arrangement with the pneumatic actuator, the transmission device and the locking mechanism thus comprises a large number of individual parts and is expensive to manufacture and assemble.


SUMMARY OF THE INVENTION

It is therefore 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 theses objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated in a fuel injection pump of the above mentioned general type in that the adjusting device has a switching element which is acted upon by atmospheric pressure and, as a function of the atmospheric pressure, closes and opens a circuit into which a working element acting on a stop lever is connected, and the working element changes its position or its length following the closure and opening of the circuit.
The fuel injection pump for an internal combustion engine designed in accordance with the present invention has the advantage that the stop lever is adjustable by simple means as a function of the atmospheric pressure.
In accordance with a further feature of the present invention the switching element is designed as an electrical switch, the circuit is designed as an electric circuit and the switching element closes the circuit when a certain value of the atmospheric pressure is undershot.
The working element in accordance with the present invention can be electrically heatable and can change in length as a function of temperature.
In accordance with still another feature of the present invention the working element is designed as an element based on an expanding material. With this feature the adjustment of the stop lever is limited to a predetermined value.
Further, the adjustment of the stop lever brought about by the working element can be limited by a counterstop.
The counterstop can be adjustable. On its side opposite to the stop lever, the working element can be supported via a spring. By virtue of the support of the working element, the working element can expand toward the spring when the stop lever is resting against the counterstop.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiment when read in connection with the accompanying drawings.


BRIEF DESCRIPTION OF THE DRAWINGS

The figure shows a fuel injection pump in the form of a longitudinal section.


DESCRIPTION OF A PREFERRED EMBODIMENT

A distributor-type fuel injection pump

REFERENCES:
patent: 2965089 (1960-12-01), Holley
patent: 3311102 (1967-03-01), Voigt
patent: 4384560 (1983-05-01), Jager
patent: 4432321 (1984-02-01), Matsuda
patent: 4469066 (1984-09-01), Yuzawa
patent: 4664081 (1987-05-01), Eheim
patent: 4887571 (1989-12-01), Eheim

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