Patent ID: 6135428
Filing Date: 2000-10-24
Classification: B27B,F02B,F02M

Abstract:
A diaphragm carburetor for a combustion engine having a manual starter, said diaphragm carburetor comprising:a housing (8);a control chamber (16) arranged in said housing (8) and filled with fuel;a suction channel (10) arranged in said housing (8);said suction channel (10) having a venturi section (9);a throttle flap (12) rotatably supported in said suction channel (10) downstream of said venturi section (9) in a flow direction (13) of combustion air being sucked into said suction channel (10);a main valve path (19) connecting said control chamber (16) to said venturi section (9);an idle valve path (20) connecting said control chamber (16) to said suction (10) and opening into said suction channel (10) at a location downstream of said throttle flap (12) in said flow direction (13);a choke flap (11, 111) rotatably supported in said suction channel (10) and positioned upstream of said venturi section (9);said choke flap (11, 111) having identical cold start and warm start positions and allowing a flow volume of combustion air (21) into said suction channel (10) sustaining running of the engine after startup;a bypass (24 25; 25.1, 25.2) for combustion air when said choke flap (11, 111) is in a closed position, said bypass (24 25; 25.1, 25.2) dependent on and controllable by a vacuum pressure downstream of said choke flap (11, 111).