Patent GB-373276-A (GB)
Title: Improvements relating to fuel injection in oil engines
IPC: F02M63/00
Filed: 1931-02-23
Abstract: 373,276. Oil engines; pumps. PACKARD MOTOR CAR CO., Detroit, Michigan, U.S.A. Feb. 23, 1931, No. 5604. Convention date, March 31, 1930. [Classes 7 (ii), 7 (iii), 7 (iv), 7 (v), and 7 (vi).] The fuel injection pump of an internalcombustion engine is actuated by a cam which is driven at different speeds from one or other of two engine mechanisms so that at starting the speed of the pump relative to the speed of rotation of the engine is faster than the speed at which it is actuated during normal running. In a four-stroke Diesel engine having nine radial cylinders liquid fuel is injected into the cylinder through nozzles 32 by pumps 33 in which spring-pressed plungers 35 are actuated by links 37 connected to rods 38 which engage levers 40 bearing on a four-lobe cam 42 mounted on the crank shaft 27. By adjusting a ring 129 as described in Specification 363,891 the length of the plunger stroke can be varied. A single venturi passage 17 in the cylinder head is controlled by a valve 18 and serves for the inlet and exhaust of the gases ; air admitted to the cylinder may be caused to rotate. The valve 18 is engaged by a lever 19 actuated by rods 20, 46, a lever 47 and a cam 43 mounted on the hub of the cam 42. The cam 43 by which the valve 18 is actuated is driven from the crank shaft 27 through gears 48, 49, 51, 52, at one-eighth the speed of the crank shaft. A clutch 53 slides on the crank-shaft and a clutch 54 is splined on the hub of the fuel cam. The clutch 53 and the cam 43 have dogs 55 which can be brought into engagement with dogs 56, 57 formed on opposite sides of the clutch 54 by moving the clutch 54 through an arm 58. A spring 61 normally urges the clutch 54 towards the cam 43 so that cams 42, 43 rotate together at one-eighth the speed of the crank shaft. When the clutches 53, 54 engage, the cam 42 is rotated at the crank shaft speed while the cam 43 is still rotated at one-eighth the speed in the reverse direction. In the neutral position of the clutch 54 the fuel pump is inactive. Incandescent plugs 62 provided in the cylinder head in the path of the fuel are connected by leads 64 to a control box 66 containing a terminal 67 connected to an earthed battery 69. An inertia starter 70 for the engine comprises a sliding clutch member 71 which engages a corresponding member 72 on the crank shaft, the member 71 being actuated through a rod 74 and a link 76. The clutch is driven through multiplying mechanism by an electric motor and a friction clutch. The starting motor is earthed at 77 ; it is also connected to a terminal 78 in the control box 66. The terminal 80 is connected to the earthed battery 69. A single element controls the operation of the incandescent igniters, the inertia starter, the engagement of the inertia starter and the crank shaft, and the fuel injection pump. A shaft 100, Fig. 3, which extends through the control box 66 is rotated by a lever 101 ; at its other end the shaft is connected by a lever 102 and a slotted link 103 to the link 76 for actuating the rod 74 connected to the sliding member of the starting clutch. When rotating the lever in one direction a pin 105 slides in the slotted link 103 whereas rotation in the other direction causes the pin to engage the link 103 at one end of the slot and thus advance the clutch member 71. To engage the clutches 53, 54 an arm 106 is fixed to the shaft 100 and carries an adjustable control member 108, having bifurcated ends which engage flanges 109 on the end of the shaft 59 which actuates the arm 58. Rotation of the shaft 100 in one direction has no effect on the shaft 59, whereas rotation in the opposite direction moves the member 108 into engagement with flanges 109 and advances the shaft 59 axially to engage the clutches 54, 53 and thereby drive the fuel pump cam at the same speed as the crank shaft. The shaft 100 also carries a cylinder 113 of insulating material in which are contacts 115 for the current to the incandescent igniter and a contact 114 for the inertia starter. The terminals 65, 67 extend through an insulated plate 118 in the wall of the casing and are connected to contacts 119. The terminals 78, 80 are similarly connected to members 120. The cylinder 113 has a recess 121 in which a spring-pressed member 123 is normally seated so that when the cylinder is released the member 123 returns it to a circuit breaking position. The cylinder can be moved so that (1) both the inertia starter and the incandescent igniter circuits are made, or (2) the inertia starter circuit only is made, or (3) both circuits are broken. Thus, by rotating the shaft 100 the inertia starter and the incandescent igniters are energized and at the same time the clutch of the fuel pump cam is controlled and the clutch of the inertia starter is engaged. The clutch for the fuel pump cam may be locked in a neutral position by the shaft 85 which is actuated by the lever 86. The shaft 85 carries a latch 87 which engages a detent 88 on a sleeve 89 carried by the shaft 59. The latch is maintained either in its locked or unlocked position by a spring-pressed plunger 92 seated against an ear 93 on the latch member. The latch 87 also acts as a cam to engage the boss 88 and move the shaft 59 axially into a neutral position to stop the engine. Cylinders, mounting.-The cylinders 12 are secured to the crank chamber by flanges 13 on which bear a pair of circumferential bands 14. Valves.-The valve 18 controlling both inlet and exhaust is fitted with a series of springs 21.