Abstract: In order to provide a mixture-compressing two-stroke Otto engine with fuel injection into the cylinder space, in which it is in particular intended to make a homogeneous mixture formation possible, it is proposed that the combustion space (19) possesses essentially the configuration of a hemisphere and, with its combustion space axis (21), is, from the cylinder axis (20) relative to the side of the cylinder (11) located opposite the exhaust duct (14), disposed so as to be offset, the injection nozzle being disposed relative to the combustion space (19 in such a way that the upper portion of the jet cone (22) penetrates a predominant volume proportion of the combustion space (19), while the lower portion of the jet cone extends underneath the cylinder bottom plane (25) approximately obliquely to the cylinder axis (20), but outside the combustion space (19).

Abstract: In a method for controlling an injection valve (16) in a high-speed internal combustion engine with fuel injection, in which method, with each revolution of the engine, at a trigger point (TP1,TP2), a trigger signal is generated and according to the trigger signal, the injection operation is initiated, in which, for low engine speeds, the injection start is within a first range (ESB1) of the crankshaft angle of rotation and in which, for high engine speeds, the injection start is within a second range (ESB2) of the crankshaft angle of rotation, which second range (ESB2) in comparison with the first range (ESB1), is displaced in the direction "early" relative to the top dead center (OT), an optimal operating behavior is achieved in that, to each of the two ranges (ESB1 or ESB2), a trigger point of its own (TP1 or TP2) is allocated and in that, when changing between low and high engine speeds, starting from a predetermined threshold engine speed, a changeover of the control between the two trigger points (TP1,T

Abstract: In a manually operated machine such as a chain saw or the like, an internal combustion engine (10) located in a housing (17) and having an associated fuel injection mechanism (70) and an electro-mechanical module (80) is used to drive the machine. The engine (10) is a two-cycle one having a fuel container (140) arranged in or on the housing (17). The fuel injection mechanism in addition to the fuel container includes an injection valve (20) and a connecting tube (21) connecting the fuel container with the valve. For the connection between the outlet (22) of the injection valve (20) and the engine (10), a capillary tube (27) is used whose cross-sectional diameter is at maximum five times the cross-sectional diameter of the outlet of the injection valve, and the capillary tube is formed into the shape of a spring with its outlet opening directed into the engine block.

Abstract: In order to provide a device with fuel injection and lubricant feed means for internal combustion engines, preferably for manual guided equipment, such as chain saws, with a helical gear wheel (12) mounted on a crankshaft (11) or driven indirectly by the crankshaft (11), which is in engagement with a mating gear wheel (13) for driving the lubricant pump (16), wherein a piston (17) of the lubricant pump (16) forms a trunnion for the mating gear wheel (13) and possesses an oblique anterior surface (18) which bears against a lifting stud (20) adjustably retained in the housing, for aiding lubricant delivery adjustment of the lubricant pump (16), in a compact assembly, preferably a chain saw with several, lubrication circuits and a high-pressure fuel feed it is proposed that the helical gear wheel (12) be in engagement with two mating gear wheels (13,14), each connected with a drive shaft (17,26) for one lubricant pump (16,31) and/or one fuel pump (27).