Patent ID: 7017537

Claim:
A two-stroke internal combustion engine including an engine for a portable handheld work apparatus, the internal combustion engine comprising: a cylinder having a cylinder wall; a piston mounted in said cylinder to undergo a reciprocating movement along a stroke path during operation of said engine; said cylinder and said piston conjointly delimiting a combustion chamber; a crankcase connected to said cylinder; a crankshaft rotatably mounted in said crankcase; a connecting rod connecting said piston to said crankshaft to permit said piston to drive said crankshaft as said piston reciprocates in said cylinder; an outlet for conducting exhaust gases away from said combustion chamber; at least one transfer channel for connecting said combustion chamber to said crankcase at predetermined positions of said piston; an air channel for supplying combustion air into said crankcase; a throttle element mounted in said air channel; a separate fuel inlet in said crankcase; a fuel metering system for metering fuel into said separate fuel inlet; said fuel metering system including metering means for metering fuel in dependence upon at least one of the position of said throttle element and the rpm of said engine; said fuel metering system including a fuel-opening element defining a fuel opening and a control device operatively connected to said fuel-opening element; said control device including a regulator needle for coacting with said fuel-opening element to control the free cross section of said fuel opening; said control device including coupling means for coupling the position of said regulator needle to said throttle element; said throttle element being a throttle flap having a throttle shaft for pivotally mounting said throttle flap in said air channel; and, said control device including a control cross section formed in said throttle shaft for acting on said regulator needle and said control cross section deviating from a circular form.