GB353621A - Improvements relating to fuel injection systems for internal combustion engines - Google Patents

Abstract

353,621. Supplying liquid fuel. ALDEN, C. R., 1200, Oakman Boulevard, Detroit, Michigan, U.S.A. June 6, 1930, No. 17556. [Classes 7 (iii) and 7 (vi).] In a liquid fuel injection system wherein fuel is supplied by a pump 63, Fig. 1, to a constant-pressure reservoir 67 to feed and actuate valve members 38, Fig. 2, controlling the discharge orifices of injectors 16 .. 19, Fig. 1, the injector feed and control lines 42 .. 45 and 59 .. 62 respectively, are connected to a rotary distributer 74 in which provision is made for varying, independently, the timing and duration of the injection period. A distributer block 72 is interposed between the supply pipe 70 and the rotary distributer 74, the block housing the requisite number of screw-down valves 83 .. 86 and 95 .. 98 for separately adjusting the flow in the feed and control lines of their associated injectors respectively. Fig. 19 shows diagrammatically the connections to one injector with the surfaces of the distributer rotor 115 and casing 114 in development; the distributer controls the feed and valve-actuating operations in the following sequence:-(1) Full pressure is admitted simultaneously to chambers at each end of the valve 38 as a helical groove 121 registers with the appropriate radial feed port 116, via pipes 70, 73, 75, 42 to the lower chamber 39, and direct from block 72 through an adjustable orifice 106 and pipe 59 to the upper chamber 48 ; the areas of the ends of the valve member 38 are equal but the valve remains closed owing to a portion of the lower effective area being excluded by the seating. (2) Pressure on the top face of the valve is reduced as a vertical groove 135 on the rotor is moved into register with a port 129 thus diverting the pressure fluid to a drain orifice 140, via pipes 125, 134 as intercommunicating ducts 135 .. 138 formed in the lower portion of the rotor register with a drain port 133 ; the valve opens due to the differential pressures and injection commences. (3) Full pressure is restored in the upper chamber 48 by the moving of the groove 135 out of register with the port 129 but a spring 50 maintains the valve open during the period when equal fluid pressures occur at its opposite ends. (4) Injection pressure is cut off as the groove 121 moves away from the port 116 and the valve closes under the excess pressure on its top face. The duration of the injection period is adjusted by moving the rotor axially through a lever 159 and quadrant 149, Fig. 10, the period being reduced as a feed release port 122 is moved further into the transverse plane containing the radial feed ports 116 .. 119, the relative angular positions of the drain control ports 135.. 138 remaining unaltered. For any setting of the injection period control 159 the timing may be adjusted relative to the crank shaft by sliding the driving gear 143 axially on an extension of the rotor by means of a control lever 169 and bell crank 165. Each injector, Fig. 2, comprises a cylindrical body 25 and a detachable conical tip portion 24, the assembly being secured by a yoke 33 which is held to the cylinder 11 by two bolts 34. The control pipe 59 is attached to a ring 56 embracing the upper part of the body. An adjustable stop 51 limits the lift of the valve member 38.