GB941453A - Free piston engine - Google Patents

Abstract

941,453. Free piston engines. GEWERKSCHAFT EISENHUTTE WESTFALIA. April 8, 1960 [April 14, 1959], No. 12666/60. Heading FIB. A free piston engine for producing rectilinear mechanical oscillations by means of a freelymoving reciprocable working piston which is bilaterally stepped and the two reduced diameter ends of which engage in ends of a working cylinder which are associated with the piston ends and form the working chambers while a central larger diameter collar part of the working piston forms a common driving means for control members of two Diesel two-stroke parts of the engine and is surrounded by an annular cylindrical chamber which form a fresh air admission chamber and is provided with air inlet valves controlled by the piston collar part is characterized by the provision of air admission ducts formed centrally in the working piston and having non- return valves and leading to the end faces of the piston and transverse ducts which are connected to the air admission ducts and start in front of the piston collar part and open behind it into the annular chamber. Referring to Fig. 1 from the fuel container 14 fuel passes through lines 15 to the suction valve 42 which regulates the quantity of fuel for combustion in the cylinder 10. The opening of the suction valve is effected by the pump 29, 30 which is driven by the stepped piston 12, 13. The pump piston is provided at its abutment end with a rubber pad not shown. Fuel in the cylinder 29 and line 16 is sprayed into the combustion chamber by the sudden movement of the pump piston 30. During movement of the working piston 12 the non-return valve 20 opens approximately when the outlet slots 17 have been opened since the pressure in the transverse duct 19 of the piston 12 corresponds to the pressure of the compressed air in the annular space 11 and the pressure in the chamber 45 is relieved by discharge of combustion gases. Below the cylinder 10 there is a pressure container 22 which is sub-divided centrally and which communicates with the working chambers of the engine cylinder 11 through two pipes 23 by way of valves 24 and non-return valves 25. Starting The engine can be started by compressed air from the pressure container 22. The filling of the container 22 is terminated as early as possible after the engine has been started. The non-return valves then remain in their initial position since the high pressure in the container 22 prevents them being opened with the engine at rest if at one side of the cylinder 10 the shut off valve 24 is opened the piston 13 moves suddenly into the dead centre position opposite from the shut off valve 24 for starting. In a modification the fuel pumps are operated by the compression pressure and fuel control devices are governed by the pressures in the compression chambers of the engine.