DE560266A

DE560266A -

Info

Publication number: DE560266A
Authority: DE

Description

Es ist bekannt, Zweitaktverbrennungsmotoren mit Kurbelkastenspülung und vom Arbeitskolben gesteuerten Überströmschlitzen mit einem besonderen Hilfskolben zu versehen und diesen, etwa wie es die Abb. 1 bis 3 zeigen, von der Kurbelwelle aus durch einen Nockentrieb anzutreiben.It is known, two-stroke internal combustion engines with crankcase scavenging and dated To provide working piston controlled overflow slots with a special auxiliary piston and this, as shown in Figs. 1 to 3, from the crankshaft to drive a cam drive.

Nach der vorliegenden Erfindung soll der Nockentrieb c, d, e, um ihn den besonderen Erfordernissen des Spülens anzupassen, derart ausgebildet werden, daß der Hilfskolben α seinen Saughub erst dann beginnt, wenn der Arbeitskolben die Uberströmschlitze ganz oder fast ganz geschlossen hat, und ihn gegen t5 Ende des Auswärtsganges des Arbeitskolbens beendet, daß er darauf während des Expansionshubes des Motors bis zur öffnung oder bis kurz vor öffnung der Uberströmschlitze in seiner äußeren Stellung verharrt und anschließend seinen Druckhub ausführt, der erst kurz vor oder beim Abschluß der Überströmschlitze beendet ist.According to the present invention, the cam drive c, d, e, in order to adapt it to the special requirements of purging, should be designed in such a way that the auxiliary piston α only begins its suction stroke when the working piston has completely or almost completely closed the overflow slots and him towards t5 the end of the outward path of the working piston ends, so that it then remains in its outer position during the expansion stroke of the engine up to the opening or until shortly before the opening of the overflow slots and then executes its pressure stroke, which ends shortly before or at the end of the overflow slots.

Ein so von der Kurbelwelle b gesteuerterOne so controlled by the crankshaft b

Nockentrieb eignet sich besonders gut dazu,The cam drive is particularly suitable for

»5 gleichzeitig an sich bekannte Einlaß- oder Auslaßorgane, z. B. /, des Arbeitszylinders zu betätigen, wie das Abb. 3 zeigt.»5 simultaneously known inlet or Outlet organs, e.g. B. / to operate the working cylinder, as Fig. 3 shows.

Claims

Claim:

Two-stroke internal combustion engine with a crankcase pump and overflow slots controlled by the working piston, in which an auxiliary piston driven by a cam drive from the crankshaft helps suck in the pump charge and exerts a pressure effect on the pump contents, characterized in that the cam drive is designed in such a way that the auxiliary piston (a) has its suction stroke only begins when the working piston has closed the overflow slots completely or almost completely, and ends it towards the end of the outward path of the working piston, so that it then remains in its outer position during the inward stroke of the latter up to the opening or until just before the overflow slots open and then executes its pressure stroke, which is only ended shortly before or at the end of the overflow slots.

1 sheet of drawings