Patent GB-106074-A (GB)
Title: A New or Improved Internal-combustion Engine Fuel Sytem.
Inventor: MORGAN WILLIAM
IPC: F02M67/00
Filed: 1916-03-31
Abstract: 106,074. Morgan, W., and Mills, W. March 31, 1917. Two-stroke-cycle engines; pumps, ports and passages of.-In fuel systems in which the liquid fuel, after issuing from a nozzle, traverses a heated vaporizing chamber to which inert gas or vapour is admitted to carry the fuel, and from which the air or the greater portion thereof is excluded, the delivery of the fuel from the nozzle is adapted to be dependent solely upon gaseous pressure-difference created by the engine. The fuel is admitted through a nozzle b to a chamber a in which a depression is produced through a conduit c which enters a constricted portion n of a pipe d through which atmospheric air is delivered to the crank chamber or other pump space, whence it is supplied to the cylinder. The area of the constriction n and of the nozzle b may be varied automatically and simultaneously. To ensure a depression being produced in the pipe d, its inlet end o is provided with an automatic valve p which is kept normally closed by a spring q, the pipe being provided also with a throttle valve u and a mechanicallyactuated rotary valve v in the case of a two-stroke engine. The chamber a has a conical bottom through a restricted aperture in which the fuel flows to a chamber j whence it is drawn into the pump e and delivered, along with a carrying medium such as air, exhaust or other gas, through a port m, and vaporizer 12 into the cylinder f<1>. The carrying medium may be admitted to the chamber a or j or to the pump through ports f<2>, f<3> in the piston. The inlet and outlet ports f, g of the pump are formed in the piston and are so situated that the suction and delivery are delayed. A relief valve k allows excess fuel and carrying- medium to escape into a chamber l whence it is returned to the pump inlet, the chamber l, in conjunction with the restricted orifice, serving also as a damping space to prevent disturbance by the pump of the pressure conditions in the chamber a. To this end also the pipe c at its junction with the chamber a, may be flared to ensure a low velocity of the entering air. The pump may be timed relatively to the engine piston, and whilst the engine is running. The fuel may be supplied by positive pressure such, for example, as that of the exhaust gases acting upon the fuel in the float chamber. In a modification, the outlet from the vaporizer 12 communicates with radial passages x, Fig. 2, leading to the seat of an inlet valve v<1> the flow of the main air charge through which induces a flow of the vaporized fuel through the passages x. The conduit between the vaporizer and the valve v<1> is restricted to avoid appreciable disturbance by suction of the pressure conditions in the vicinity of the nozzle. The fuel with its carrying medium may be injected direct into the cylinder, as shown, after the main air admission ports have been closed but before the piston has completed its compression stroke, or it may be injected into the induction pipe or into the transfer passage near the inlet valve. The non-pressure side of the pump may be in communication with the air induction system to utilize leaking fuel. Multiple jets and chambers may be provided in the case of multiple-cylinder engine. The Provisional Specification states that the fuel from the jet-chamber may be drawn direct into the cylinder through a valve the opening of which is delayed to produce suction. Specification 105,253, [Class 7 (iii.), Internal-combustion engines, Carburetting-apparatus &c. for], is referred to.