Patent GB-415747-A (GB)
Title: Device for feeding fluid to the intake of internal combustion engines
IPC: F02M25/00
Filed: 1932-12-30
Abstract: 415,747. Treating charges; lubricating. JOHNSON, J. Y., 47, Lincoln's Inn Fields, London.-(Jackson, L. J. P. ; 37, East 64th Street, New York, and Hackethal, P. F. ; 409, Wagner Road, Rocky River, Cleveland, Ohio, both in U.S.A.) Dec. 30, 1932, No. 36918. [Class 7 (ii).] Apparatus for feeding liquid in the form of a mist or vapour to the intake manifold of an internal-combustion engine, for the purpose of lubricating or of preventing carbon deposits or knocking or of neutralizing acids formed during combustion, comprises a chamber 18, Fig. 2, surmounting a liquid reservoir 17 and having an outlet 39 connected by a conduit 21 to the intake manifold, the suction in which causes a mixture of air and liquid to be drawn into the chamber through a nozzle 42 in the base thereof, whence it passes to the outlet 39 through metering holes in a plate 57 arranged across the chamber, there being disposed below the plate 57 an apertured baffle plate 59. The holes in the plate 59 are protected from the direct spray from the nozzle 42 by a depending guard 62. The nozzle is connected to the atmosphere by a conduit 49, filter plug 54, and metal screen 53, and contains a Venturi fitting 43 connected to a pipe 19 depending into the liquid in the reservoir 17 and fitted at its lower end with a gauze screen 47. The flow of air through the conduit 49 thus draws liquid up the pipe 19 to be mixed with the air. A porous pad 65 and gauze screen 66 are arranged between the plate 57 and the outlet 39, whereby an initial supply of liquid when starting the engine is insured. A small hole 63 is also provided centrally in the plate 59 to facilitate the passage of liquid at starting. The chamber 18 and reservoir 17 may be of glass, separated by a metal plate 24 provided with holes 56 for the return of surplus liquid from the chamber 18 to the reservoir, the latter being secured to the plate 24 by bolts 33 passing through a ring member 26 engaging a shoulder 23 on the reservoir, while the chamber 18 is secured to the plate 24 by screws 37 engaging the metal outlet head 36. Means, which may be arranged at either end of the conduit 21, are provided whereby a practically uniform suction is maintained in the chamber 18, regardless of the varying conditions of velocity and suction in the intake manifold. Such means comprises a body 67, Fig. 7, having a tapering passage 68, the larger end of which, as shown, opens into the manifold 15 while the smaller end opens into a chamber 70 open to the atmosphere through a gauze screen 73 by means of a small port 72 in line with the passage 68, the conduit 21 being connected to the chamber 70. Thus, during periods of high suction in the manifold, with low gas velocity, air entering through the port 72 reduces the suction in chamber 70, while during periods of low suction and high velocity the suction in chamber 70 is increased by the effect of the air entering through the port 72. A diaphragm-operated valve may be arranged to close the conduit 21 in the event of the suction in chamber 70 exceeding a predetermined amount. The amount of vapour drawn into the chamber 18 through the nozzle 24 is in excess of that required, the metering holes in the plate 57 being such that, under the effect of the constant suction, a constant predetermined amount is drawn into the manifold 15. As shown in Fig. 9, where the reservoir 17 is of sheet metal, the reservoir is also connected through a valve 101 and conduit 100 with the conduit 21. The valve 101 is interconnected with the choke valve 106 of the carburetter, the arrangement being such that when the choke rod 105 is pulled out more than half way, in starting the engine, the valve 101 is opened to permit a small quantity of liquid to pass to the manifold.