DE248710C

DE248710C -

Info

Publication number: DE248710C
Application number: DENDAT248710D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

PATENTSCHRIFTPATENT LETTERING

KLASSE 46*. GRUPPECLASS 46 *. GROUP

Die Erfindung betrifft eine Regelungsvorrichtung für Brennstoffpumpen von Verbrennungsmotoren mit flüssigen Brennstoffen und besteht darin, daß der das Ansaugen des Brennstoffes regelnde Schieber mit dem auf verschiedene Tauchtiefen einstellbaren Pumpenkolben verbunden ist, so daß bei Änderung der Tauchtiefe des Pumpenkolbens zugleich eine Verstellung der Hubgrenzen der Steuerkanten des Schiebers stattfindet und die Regelung der Pumpenleistung somit nicht nur seitens des Pumpenkolbens, sondern gleichzeitig auch seitens des Steuerschiebers erfolgen kann. Auf diese Weise läßt sich einerseits eine sehr einfache Bauart der Brennstoffpumpe und andererseits eine äußerst empfindliche Regelung der für den Betrieb des Verbrennungsmotors jeweils erforderlichen Brennstoffmengen erzielen, ein Vorteil, welcher sdwohl für die Betriebssicherheit der Pumpe als auch für die Wirtschaftlichkeit der mit der Pumpe ausgerüsteten Verbrennungskraftmaschine von erheblicher Bedeutung ist.The invention relates to a control device for fuel pumps of internal combustion engines with liquid fuels and consists in the fact that the suction of the Fuel-regulating slide with the pump piston adjustable to different depths is connected, so that when the immersion depth of the pump piston changes, the stroke limits of the control edges are adjusted at the same time of the slide takes place and not only the regulation of the pump output on the part of the pump piston, but at the same time also on the part of the control slide can. In this way, on the one hand, a very simple design of the fuel pump can be achieved and on the other hand an extremely sensitive control of the operation of the internal combustion engine achieve the required amounts of fuel, an advantage which sdwohl for the operational safety of the pump as well as for the economic efficiency of the Pump equipped internal combustion engine is of considerable importance.

Die Verstellung der Hubgrenzen des Pumpenkolbens und des Steuerschiebers kann in bekannter Weise selbsttätig durch einen Regler erfolgen, welcher durch die Verbrennungskraftmaschine umgetrieben wird.The adjustment of the stroke limits of the pump piston and the control slide can be done in take place in a known manner automatically by a controller, which by the internal combustion engine is driven.

Auf der Zeichnung ist eine Ausführungsform der Erfindung beispielsweise dargestellt. Es zeigen:In the drawing, an embodiment of the invention is shown as an example. Show it:

Fig. ι und 2 Längenschnitte durch das Pumpengehäuse bei verschiedenen Stellungen des Pumpenkolbens,Fig. Ι and 2 longitudinal sections through the pump housing at different positions of the pump piston,

Fig. 3 den Querschnitt durch das freie Ende des Steuerschiebers:Fig. 3 shows the cross section through the free end of the control slide:

Die Kammer α des Pumpengehäuses steht in bekannter Weise durch das federbelastete Druckventil δ mit dem Druckstutzen c sowie mit dem Saugstutzen d in Verbindung und nimmt den unteren Teil des Pumpenkolbens e aqf, welcher an dem einen Ende einer um den Lagerzapfen f. drehbaren Schwinge g. angelenkt ist, deren anderes Ende mit der Stange h des auf der Exzenterscheibe i dreh- 4-5 baren Exzenterringes / gelenkig verbunden ist.The chamber α of the pump housing is in a known manner through the spring-loaded pressure valve δ with the pressure port c and with the suction port d in connection and takes the lower part of the pump piston e aqf, which is at one end of a pivot f. Rotatable rocker g . is articulated, the other end of which is articulated to the rod h of the eccentric ring rotatable on the eccentric disk i.

Gemäß der Erfindung steckt in dem Saugstutzen d ein Saugschieber k, welcher mit dem Pumpenkolben c fest verbunden ist und z. B. aus einem Stück mit demselben bestehen kann, so daß der Schieber alle Bewegungen des Kolbens mitmachen muß. Der Schieber k ist entsprechend der zylindrischen Bohrung des Saugstutzens d in seiner Grundform zylindrisch gestaltet und in einem bestimmten Abstand vom Pumpenkolben e mit Längsnuten I versehen, Welche bis an sein freies Stirnendc reichen und einerseits zur Führung des freien Schieberendes, andererseits zur Ermöglichung des Eintrittes des Brennstoffes nach der Kammer α bestimmt sind. Die dem Pumpenkolben e zugekehrten Endkanten in der Längs- '>_:_ nuten I des Schiebers k bilden dessen Steuerkanten und gelangen mit der Kante η am Boden der Kammer α zur Deckung, wenn der Schieber zusammen mit dem Kolben auf und nieder geht.According to the invention inserted in the suction d a suction slider k, c which with the pump piston is fixedly connected and z. B. can consist of one piece with the same, so that the slide must take part in all movements of the piston. The slide k is cylindrical in its basic shape corresponding to the cylindrical bore of the suction nozzle d and is provided with longitudinal grooves I at a certain distance from the pump piston e , which extend to its free end c and on the one hand to guide the free end of the slide, on the other hand to enable the entry of the Fuel after the chamber α are determined. The pumping piston e facing end edges in the longitudinal _'>: _ utes I of the slider k form the control edges and engage with the edge of η at the bottom of the chamber α to cover, when the slider goes together with the piston up and down.

Wird auf die Führung des Schiebers k imIs on the guide of the slide k im

('2. Auflage, ausgegeben am ·2ΐ. November rt)i2.)('2nd edition, issued on November 2nd rt) i2.)

Claims

If suction nozzle d is dispensed with, the lower part of the same, having the grooves I, can also be omitted, so that the control edge of the slide is formed in a simple manner by the edge of its flat, circular end face. When the pump piston e rises and falls, depending on whether the bearing pin f of the rocker g is set higher or lower according to FIG. The control edges m of the slide k must therefore remain in the suction nozzle d during the greater part of the pump piston stroke according to FIG Suction line is in communication with chamber a only during a small part of each piston stroke. When the pump piston e goes down from the top dead center, only a small part of the fuel sucked in can escape after the suction line as long as the control edges m of the slide k have not yet coincided with the edge η at the bottom of the chamber α, so that the fuel sucked in during the previous piston stroke is for the most part pressed through the pressure valve b and the pressure port c into the cylinder of the internal combustion engine, not shown in the drawing, and the fuel pump develops its greatest power. In the position of the bearing pin f of the rocker g shown in FIG. 1, however, the control edges m of the slide k always remain outside the suction port d throughout the path of the pump piston e, because the pump piston e does not enter the chamber α at all. The amount of fuel sucked in at the suction tube of the pump piston e is therefore driven back to the suction line at the pressure tube without the pressure valve b opening, so that the pump does not deliver any fuel and the internal combustion engine runs idle. Depending on whether the journal f of the rocker g is set between the limit positions shown in FIGS. 1 and 2 by the controller driven by the internal combustion engine, the delivery rate of the fuel pump can be regulated completely automatically in a very sensitive manner. The vertical movement of the bearing pin f of the rocker g is caused in the drawn j Ausührungsbeispiel the invention by an eccentrically mounted bolt ζ connected to the pin f by means of a support y on the part of the linkage u, υ, but can also be done in other ways, e.g. B. can be achieved by directly attaching the pin f to the regulator sleeve, or by hand, or with the help of a screw spindle and the like, wherein a servo motor can be switched on between the controller and the pin f. Instead of the eccentric i, another power transmission device can also be used to drive the rocker g. The longitudinal grooves I of the slide k can also be replaced by longitudinal bores which are crossed by transverse bores, the edges of which serve as control edges. If the immersion depth of the pump piston is changed in a known manner by changing the piston stroke, the change in stroke of the pump piston also contributes to the change in the performance of the pump. In the illustrated embodiment of the invention, however, the piston stroke remains unchanged when its immersion depth changes, but this fact is irrelevant for the essence of the invention. Godfather ν T-A ν sprüciie:

1. Control device for fuel pumps of internal combustion engines with liquid fuels, characterized in that the element (k), which controls the suction of the fuel, is connected to the adjustable to different depths of the pump piston (s) , so that by changing the depth of the pump piston Stroke limits of the suction element can be changed.

2. Control device according to claim i, characterized in that the suction member (k) consists of a tapered axial extension of the pump piston (e) and slides in the manner of a piston slide in the suction nozzle (d) of the pump housing.

3. Control device according to claim i, characterized in that the immersion depth of the pump piston (e) and the stroke limits of the suction element (k) can be changed by shifting the bearing pin (f) of a rocker arm (g) , at one end of which the pump piston is attached, while its other end is connected to the drive elements (h, i, j) of the pump.

1 sheet of drawings.