GB642460A - Improvements in or relating to two-stroke internal-combustion engines, in which the cylinders are arranged parallel to the output shaft - Google Patents

Abstract

642,460. Two-stroke engines. MARCZEWSKI, J. Aug. 17, 1948, No. 21667. [Classes 7(ii), 7 (iii), and 7(vi)] '[Also in Groups XXVI and XXVIII] Opposed pistons 8 in parallel cylinders 2 operate, through pairs of rollers 10, 11, cams 51 on discs 18 on the output shaft 22, and second cams 6 return the pistons. Rollers 10, 11 are mounted on cylindrical extensions 9 of the pistons which reciprocate in cylindrical tracks formed by guides 15 mounted on plates 3, and sliding plates 16 keep the axis of the rollers radial. The cam tracks which may have two throws per revolution are arranged so that the exhaust parts 86 open and close before the inlet ports 79 which are preferably tangental to the cylinders. The cams 51 dip into lubricant in the casing. A combined lubricant and cooling water pump is driven by a shaft 31 from a bevel on the main shaft, which also drives, by a shaft 70, the fuel injection apparatus. The upper and lower cylinders are spaced apart to allow passages through the water jacket for the shafts 31, 70. Air is supplied through a passage 66 by a blower comprising blades 40, Fig. 3, mounted on bearings 41, 42 in discs 36, 35, connected by links 38 and rotated by the main shaft. The blades are turned to pass through a circular passage 47 between fixed abutments 53, 54, and back to their blowing position by levers 59 and cam tracks 61, 60. Stops are provided to limit the movement of the levers .59. The air enters through a filter 65.. The fuel pump comprises a cylindrical shell 67, Fig. 14, carrying plunger guides 111; and a rectangular block 81, in which two pumping barrels 80 are mounted. The plungers are operated by a face cam 74 and inlet and delivery poppet valves allow communication with passages 84, 85, in the block, leak valves 94, 100 for stopping and regulating the amount of fuel injected being controlled by a lever 97 and a screw 102 respectively, the screw 102 being adjusted by hand or a governor. The compressed fuel is delivered by a pipe 106 to a distributer casing 107, wherein a split sleeve 108, having a trapezium shaped port, is rotated by a split hub 113 which is splined to the pump shaft, the fuel passing to the inside of the split sleeve through a slot cut in its seating. Flexible pipes lead to the cylinder nozzles. Timing is adjusted by rotating the casing 107 through an eccentrically mounted sleeve 123 which can be adjusted by a handle 124, and duration of injection by axial adjustment of the casing 107 by a hand wheel 117 having thread engagement with a plate 120, measurement being taken by an indicator attached to the handle 124 and a feeler guage 128. In a modified distributer the rotating sleeve is replaced by poppet valves operated through tappets from a trapezoidal cam on an extension of the shaft 70. The tappets have axial bores which allow fuel to drain from the injector pipe lines and thus prevent drip, when the distributing valves are closed. Adjustment is effected by rotation and axial movement of the body, as described above. Specification 425,112 is referred to.