Патент USA US2123325код для вставки
July 12, 1938. I. 2Elss|__ I - 2,123,325 ENGINE WITH RADIALLY ARRANGED WORKING CYLINDERS AND PIS‘TON SCAVENGING PUMPS‘, Filed 001;. 21. 1956 I I/ 2 Sheets-Shget 1 ' July 12; 1938. , -,_ ZEISSL ' 2,123,325 ENGINE WITH RADIALLY“ ARRAI‘K‘IEDv WORKING CYLINDERS AND PISTON SCAVENGI‘NG PUMPSv Filed Oct. 21, less 2 Sheets-Sheet 2 /n ventor»: Z @5882 Patented July12,;1938 2,123,325 UNITED STATES- PATENT OFFICE ' 2,123,325 RADIALLY ARRANGED WORKING CYLINDERS AND PISTON SCAY ENGINE ‘WITH ENGING PUMPS Ignaz Zeissl, Vienna, Austria ‘ Application October 21, 1936, Serial No. 106,881 In Austria October 24, 1935 (Cl. 123—-55) The known constructions of controlling the these advantages being of particular importance p 2 Claims. suction ports of the piston-scavenging of two stroke engines possess such considerable draw backs that the slight enlarging of these engine 5 types is connected to a great extent with these drawbacks. In most of these engines, the suc tion ports of the scavenging pump are controlled by automatically operating ?aps which, however, start to wobble at higher numbers of revolutions and do not operate satisfactory‘ anymore. Com‘ 10 pared with the four stroke engine, the advantages of simplicity are lost if valves or slides operated by control members are arranged, because in this event the construction of the engine becomes complicated. Finally engines are known, in 15 which the suction ports of, the scavenging pumps in the construction of aircraft engines. One mode of carrying out the present inven tion is illustrated by way of example and partly in section in the accompanying drawings. Fig. 1 is a vertical section through the‘ engine, with the working piston at top dead centre. Fig. 2 is a diagram of the position of the cranks of the working piston I and scavenging piston II, corresponding to Fig. 1. v I Fig. 3 is a section through the engine with the working-piston at bottom dead centre. Fig. 4 shows the position of the cranks corre sponding to Fig. 3. , » In the drawing a is a cylinder of the working 15 set, b its piston, e a cylinder of the scavenging are opened by the scavenging piston just before set and 1 its piston. Both pistons operate'on the latter reaches its dead centre, thus where the scavenging piston controls the suction ports. connecting rods 0, g. 20 However in this construction, during the sue tion stroke of the piston, a vacuum depending on the extent of the clearance is formed in the scavenging cylinder with the result of an un necessary expenditure of power, hot scavenging 25 air and thus small e?lciency of the engine. The present invention has for its object to ob viate these drawbacks in the case of engines provided with two sets of radially arranged cyl inders, one of said sets comprising solely work 30 ing cylinders and the other set consists of corre sponding scavenging cylinders only, and the es sential feature of the present invention consists in that always one working cylinder and one scavenging cylinder are co-opcrating in such 35 manner that the piston of the working cylin der controls the inlet and outlet of air into and out of the corresponding scavenging cylinder. Further according to the invention, the pistons of each set are mounted on separate cranks of a] 40 crank-shalt, which are displaced with respect to one another in such manner, that the co-operat ing working- and scavenging cylinders may be arranged behind one another whereby, however, the scavenging cylinder is timely controlled by 45 the piston of the working cylinder. This ar separate cranks d, h of a crank-shaft through The crank h of the scav enging cylinder is in advance by approximately 130 degrees. Further, k is the duct leading from the scavenging cylinder e to the working cylinder 0., m is the scavenging port of the working cyl inder and n the suction port ofthe latter. Air is sucked by way of the port 11. from the crank-case of the working set. '0 is the exhaust port. Having now particularly described and ascer tained the nature of my said invention and in what manner the same is to be performed, I 30 declare that what I claim is1. An engine having a set oi.’ radially arranged working cylinders and a set of‘ radially arranged scavenging cylinders each co-operating with one of the working cylinders, pistons reciprocating in' the cylinders, and a passage connecting each scavenging cylinder with the corresponding work ing cylinder, with one port in the scavenging cyl inder and twov piston-controlled ports in the working cylinder, of which one opens into the ‘ combustion space of the cylinder and the other 40 opens into the lower part of the cylinder below the piston. 2. An engine as claimed in claim 1, having each scavenging cylinder arranged beside the corre sponding working cylinder, and having a crank shaft, with one crank for the pistons of all the rangement possesses the advantages of renders ing unnecessary the provision of connecting ?ues working cylinders and another crank, displaced or pipes between the two cylinders ‘and further with respect to the ?rst crank, for the pistons of the scavenging cylinder is shielded by the work 50 ing cylinder, whereby not only the weight but also the air-resistance of the engine are reduced; all the scavenging cylinders. IGNAZ znrssn; 50.