Construction Tools Pc Ab

Atlas Copco Construction Tools Ab

Johan Bram

The invention related to a two-stroke internal combustion engine (), comprising a crankcase (), which has an air intake (), and at least one cylinder (), which is connected to the crankcase () and which, together with a piston () arranged therein, defines a combustion chamber (). The cylinder () has at least one air inlet (), which via an air duct () communicates with the crankcase (), in which a mixture of air and lubricating oil and fuel, if any, is contained. The air duct () is connected to the crankcase () via a separator () for cleaning of air coming from the crankcase () from lubricating oil and fuel, if any. The separator () has a centrifugal chamber (), in which the lubricating oil and the fuel, if any, in a circulating motion are thrown outwards to a circumferential wall () and thus substantially cleaned air is passed, through a chamber outlet (), which with respect to said circulating motion is a radially inner outlet, to said air duct () to be supplied to the combustion chamber () through the air inlet ().

Two stroke combustion engine

The invention relates to a fuel-powered breaker machine () which has a cylinder () with two pistons () disposed therein. The first of the pistons () is adapted to opening and closing at least an inlet aperture () on an inlet side (I) in a cylinder shell wall (), and an outlet aperture () on an opposite outlet side (O) in the cylinder shell wall (), and, when the apertures () are closed, to compressing against the second piston (), which acts as the working piston of the breaker machine (), an ignitable air/fuel mixture which is admitted via the inlet aperture/apertures (). The first piston () has a crown () which is shaped correspondingly to a crown () of the second piston () and which on said inlet side (I) has a recess () which serves, when the first piston () is at an upper dead center position, as a combustion chamber into which a spark plug () protrudes via the cylinder shell wall () on the inlet side (I), and, when the first piston () is at a lower dead center position, as an inlet chamber into which the inlet aperture/apertures () leads/lead.

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Kalmar, Sweden

Johan Bram