| 摘要 |
PCT No. PCT/DE97/01557 Sec. 371 Date Jan. 28, 1999 Sec. 102(e) Date Jan. 28, 1999 PCT Filed Jul. 23, 1997 PCT Pub. No. WO98/05860 PCT Pub. Date Feb. 12, 1998The invention relates to a fuel pumping device for two-cycle engines with at least a one-piece housing, on which a pulse air connector (14), which is pneumatically connected with the crankcase of the two-cycle engine, a fuel aspiration connector and a fuel pressure connector are arranged, in which a diaphragm (41) on which pulse air acts, drives a pump piston (22) in connection with a diaphragm disk (42), in the course of which fuel being supplied from the tank (1) at the fuel aspiration connector during the pump aspiration stroke is aspirated via a flap valve (61) into the compression chamber (51) located upstream of the pump piston, and is pumped during the compression stroke via a further flap valve (71) into the fuel pressure connector and into a reservoir (73) and/or an injection valve (5). The pulse air connector (14) terminates in a housing chamber (13) located between the diaphragm (41) and the pump piston (22), and at least one spring element (15, 35, 94) acts on each side of the diaphragm (41). Here, the spring element (15) arranged in the housing chamber (13) is supported on the diaphragm (41) via the separate pump piston (22). An electromagnetic drive unit (90) is arranged in the housing chamber (33) located on the other side of the diaphragm (41), which via its armature (91) supports the compression stroke of the pump piston (22) synchronously with the compression stroke of the two-cycle engine. |
