Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1996-08-05
1998-03-03
Moulis, Thomas N.
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
F02D 104
Patent
active
057223696
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a fuel injection pump for internal combustion engines. One such fuel injection pump, known from European Patent Disclosure EP-A-0 451 151 has a T-shaped control lever on the outside of the pump housing that is joined to an adjusting shaft that leads to the idling spring control lever in the interior of the pump housing and is pivotable about the adjusting shaft as a pivot axis. A Bowden cable is pivotably connected to the base of the T-shaped control lever and is actuated by a pneumatic control motor as a function of operating states of the engine. Independently of this control lever in the known fuel injection pump, the adjusting lever is provided on the outside of the housing of the fuel injection pump; it is adjustable between two stops and is actuated by a so-called throttle control cable for controlling the torque output of the engine.
The control lever is actuated by the control motor, especially to increase the idling rpm, when additional units of the engine are turned on.
ADVANTAGES OF THE INVENTION
The fuel injection pump according to the invention has the advantage over the prior art that because of the coupling of the control lever to the adjusting lever, the idling can be controlled within certain operating ranges specified by the setting of the adjusting lever. Particularly in the critical low-rpm range, a desired fuel injection quantity or torque output can be attained, and as a result the running behavior of the engine can be improved in such specified critical ranges.
As a result of the features set forth herein, a favorable arrangement for attaining the idling adjustment is obtained, which can optionally be retrofitted into an existing fuel injection pump where space is tight. With a further feature of the invention, the onset point of the intervention into the idling can advantageously vary over the course of adjustment of the adjusting lever and can be adapted to special characteristics of the associated engine. Other options for adaptation are provided, by which particularly where the pivot planes of the adjusting lever and control lever are offset by 90.degree. from one another, a favorable, space-saving arrangement is created.
BRIEF DESCRIPTION OF THE DRAWINGS
One exemplary embodiment of the subject of the invention is shown in the drawing and will be described in detail below. FIG. 1 shows a schematic arrangement of a governor spring, idling spring and governor levers with a quantity adjusting device of a fuel injection pump; FIG. 2 shows the exemplary embodiment of the invention with coupling of a control lever to an adjusting lever of the fuel injection pump via a cam course; and FIG. 3 shows a view offset by 90.degree. of the arrangement shown in FIG. 1.
DETAILED DESCRIPTION OF THE DRAWINGS
In the interior of a fuel injection pump, of the kind known from EP-A-0 451 151, a pump piston 1 is disposed in a housing bore; although not shown here, it defines a pump work chamber in the housing bore, is driven both to reciprocate and to rotate, and in its motion out of the pump work chamber, it feeds the fuel previously introduced to one of a plurality of injection lines, determined by its rotary position, at injection pressure. The termination of the supply stroke of the pump piston at high pressure is effected by opening a relief conduit 2, which begins at the pump work chamber in the pump piston 1, extends via a radial bore 3, and emerges at the circumference of the pump piston and discharges into the suction chamber surrounding the pump chamber there; the suction chamber is filled with fuel at low pressure, and from it, the pump work chamber is supplied with fuel upon the intake stroke of the pump piston. The relief of the relief conduit 2 via the radial bore 3 takes place whenever the pump piston, in the course of its supply stroke, which in the drawing is toward the right, departs from the position overlap with a quantity adjusting device 4, in the form of an annular slide, that can be slipped tightly over the pump piston 1.
The quantity
REFERENCES:
patent: 4615317 (1986-10-01), Bofinger et al.
patent: 4703730 (1987-11-01), Eheim et al.
patent: 4913115 (1990-04-01), Konrath
patent: 4920938 (1990-05-01), Schwarz et al.
patent: 4987875 (1991-01-01), Hofer et al.
Greigg Edwin E.
Greigg Ronald E.
Moulis Thomas N.
Robert & Bosch GmbH
LandOfFree
Idling control means for a fuel injection pump for internal comb does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Idling control means for a fuel injection pump for internal comb, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Idling control means for a fuel injection pump for internal comb will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2240341