Patent GB-619995-A (GB)
Title: Two-stroke internal combustion engine
IPC: F01C1/073
Filed: 1946-12-11
Abstract: 619,995. Rotary engines. TRIANI, F. Dec. 11, 1946, No. 36632. [Class 110 (ii)] A rotary two - stroke internal - combustion engine of the geared-vane or oscillating-vane type has radial pistons 21 or 23, in pairs, each being hollow to allow circulation of coolant. Various types of clutches may be used to transmit the varying speeds of the piston shafts 25, 26 to secure uni-directional motion of the engine shaft 29. Ignition of the gases may be by compression, or by a sparking plug. Scavenging air may be supplied by a compressor 70 of the gearedvane type. Packing bars and segments 33 ... 36 are provided. Scavenging and exhaust ports 41, 40 are arranged as shown. Valves may be fitted to the former. Fuel injectors 42 supply combustion chambers 43 containing compressed air. Cooling oil is delivered by a pump through a collar 45 which supplies conduits 46. Rotors 28, 31 drive a drum 51 through friction-shoes when each rotor speed becomes greater than that of the drum. Roller clutches may be used instead of the above. A flexible coupling may be inserted between the drum 51 and a fly-wheel 53 on the shaft 29. Fig. 15 shows a means in which the hub 55 of drum 51 is provided with bundles of flat springs 56 which engage in slots cut in the fly-wheel 53. The springs bear against stops 57 which damp their vibrations Wheels 60, 61 on shafts 25, 26 are connected by open and crossed belts or chains, respectively, to wheels 62, and wheels 60, 61 are connected by crossed and open belts or chains to wheels 63. This ensures that for each angle of rotation of wheel 60 (and pistons 21), the other wheel 61 (and pistons 23) move through an equal angle in the opposite direction. Gearing or rocker arms and rods may be used instead. The engine is fitted with the normal auxiliaries such as pumps for fuel and coolant, and the like. In a modified engine the shafts supporting the pistons extend only for half the axial length of the working chamber. An engine with shafts rotating in opposite directions, Fig. 25, has two working chambers 125, 126 in which the pistons at one time move in opposite directions. Two right-hand clutches 128, 129 and two left-hand clutches 130, 131 are fitted at the shaft ends. A scavenging air compressor 127 is provided. The engine may be modified to have an engine space on one side of a piston and an air cushion on the other. The moment of inertia of the pistons may be increased, Fig. 30, by varying the radial distance of each mass 170 from the axis of rotation. The two masses 170, on pivots 171, can pass from the position shown in full lines to that shown in dotted lines. These movements are controlled by a regulator, according to the engine speed, through an oiloperated servo-control acting on a piston in a cylinder 172. Tie rod 173 connects the two masses. The masses move away from the centre of rotation, when the engine speed decreases, to increase the moment of inertia of the whole rotor. In a modification, the increase in moment of inertia may be secured by coupling in an auxiliary fly-wheel at low engine speed, by a sleeve clutch followed by a dog clutch. An electromagnetic clutch may be used. Other types of clutches such as a gear pump with a periodically shut-off valve locking a fluid column, or a cam-actuated ratchet gear, are described in the Specification.