Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1988-07-06
1990-03-20
Miller, Carl Stuart
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
123373, 123385, 123372, F02M 3900
Patent
active
049092162
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a regulating arrangement of a fuel-injection pump with a lever. The blocking of the regulating device by a jamming pump piston in one of the coupled fuel-injection pumps is prevented by the torque-limiting driving device between rotatable part and lever. The other fuel-injection pumps ready for operation can therefore be continued to be regulated so that the internal combustion engine in question remains limitedly operational.
Regulating arrangements of this type are known from the DE-PS No. 564 169 and the DE-OS No. 34 06 646. Furthermore, it is known from the DE-PS No. 29 50 633 to move the to-and-fro movable adjusting member of a fuel-injection pump into an end position by an axial force independently of the position of the lever which end position corresponds to the zero delivery of the pump piston. The stopping of the to-and-fro movable adjusting member changes the position of the lever independently of the instantaneous position of the rotatable part. As a result thereof, the driving device is displaced from its off-position against the force of the return spring. The restoring moment then resulting at the lever acts by way of the rotatable part on the regulator of the internal combustion engine coupled with the regulating arrangement and reduces the operating capability of the regulator in an undesired manner.
The sum of the torques which, during the stopping of adjusting members can act back on the regulator, must not exceed the operating capability of the regulator as otherwise the internal combustion engine is no longer operational. A maximum permissive prestress force for the return spring in the lever results therefrom for given conditions of a regulating arrangement. With known arrangements, the permissive prestress force of the return spring is so small that during operation of the internal combustion engine, it may lead to strong vibrations at the levers and in the entire regulating arrangement which leads to friction wear especially at the driving devices.
It is the task of the invention to create a regulating arrangement, by means of which the to-and-fro movable adjusting member of a fuel injection pump can be brought remotely actuated into a zero delivery position without resulting in a reduction of the operating capability of the regulator.
This task is solved according to the invention with the characterizing features of the claims. By opening the controllable valve pressure oil reaches by way of the bearing gap between housing and rotatable part the driving device side of the spring plate which is lifted thereby and renders the driving device inoperable. The lever is therewith freely pivotal within limits without load by the return spring. The to-and-fro movable adjusting member spring-loaded in the direction of the end position for zero delivery of the pump piston is therewith in the position to assume under entrainment of the coupled lever the zero delivery end position unimpaired by the position of the rotatable part.
The advantages achieved with the invention consist in particular in that the arrangement can be assembled in a simple manner, in that the arrangement has a small space requirement, in that the decoupling between lever and rotatable part operates without feedback on the connected regulator, in that the return spring of the lever can be dimensioned without limitation by the regulator operating capacity and in that vibrations of the regulating arrangement and of the friction wear resulting therefrom are avoided with a greater spring prestress of the return spring.
One embodiment of the invention is illustrated in the drawing and will be described more fully hereinafter. It shows:
FIG. 1 cross section of a fuel injection pump within the area of the lever;
FIG. 2 schematic partial illustration of the regulating arrangement.
A regulating arrangement for the adjustment of the feed quantity of a fuel injection pump 11 consists of a regulator not illustrated, of a rotatable part 12 connected with the regulator, of a lever 13 cooperating with the rotatab
REFERENCES:
patent: 2142172 (1939-01-01), Brill
patent: 2185147 (1939-12-01), Edwards
patent: 2280496 (1942-04-01), Meiswinkel
patent: 2445321 (1948-07-01), Fox
patent: 3859973 (1975-01-01), Dreisin
patent: 3916862 (1975-11-01), Clouse
patent: 4380223 (1983-04-01), Jefferson
patent: 4640247 (1987-02-01), Bruning
Miller Carl Stuart
MTU Friedrichshafen GmbH
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