GB1281354A - Fuel injection pump - Google Patents

Abstract

1281354 Fuel injection pumps BENDIX CORP 19 Aug 1969 [22 Aug 1968J 41297/69 Heading F1A The angular position of the pumping pistons 21 of a fuel injection pump, and hence the quantity delivered, is controlled by a rod 26 whose longitudinal position is varied by a control mechanism which includes a rigid 85 and a jointed lever 31 and facilities for easily shutting off supply to the engine, providing a maximum fuel stop and ensuring the fuel to air ratio for complete combustion is maintained. A cam shaft 17 actuating the pistons 21 drives a governor 29 which acts on a collar 54 in opposition to a throttle spring 30 the tension of which may be varied by means of rollers 49 and 51 connected to a rotatable throttle shaft 44. Jointed and rigid levers 31 and 85 are connected to a groove 59 in the collar 54 and are pivotally and co-axially connected to the outer housing at 34 and 34<SP>1</SP> so that movement of the collar causes the levers to move in unison. Lever 31 has a lower part 32 which is pivotally connected at 34 to an upper part 35 which co-operates with a pin 61 on rod 26; a pin 37 on lever 32 fits into a slot 39 on the upper part 35 and with a spring 42 holds lever 31 straight. Lever 31 remains rigid during anticlockwise rotation to move rod 26 to the left but the rod may move to the left independently of the part 32 when spring 42 is overcome. On increasing the tension in spring 30 to move the collar to the left, the levers 31 and 85 rotate to move rod 26 to the right until a stop 90 on the rigid lever 85 abuts a maximum fuel stop lever 77, carried by a shaft 74. Further movement of the rod is prevented as a portion 79 of lever 77 abuts a stop 82, this stop may, however, yield at a predetermined pressure. The rod may be moved to the left at any time to shut down the engine by means of a lever 69 on shaft 74 which may be rotated into the path of a wing 65 of a stop 64 on the rod. To prevent excess fuel being provided and incomplete combustion occurring a further lever 106 is provided on shaft 74, this prevents rod 26 moving to the right by abutting the wing 65. The lever 106 is connected to a reciprocable member 126 which is moved by a diaphragm affected by the air intake pressure, the member 126 moving against the action of a spring 130 at a predetermined air pressure to swing the lever out of the path of wing 65. The levers 77 and 106 may be moved out of the path of the stop 90 and wing 65 by lateral movement of the shaft by means of a solenoid 94. In another embodiment, Fig.6 levers 31 and 85 are replaced by a lever 160 having a portion 161 carrying a stop 171, and the upper part 35 is replaced by a lever 162, these parts operating basically as above. A maximum fuel stop lever, 181 is provided and acts, in a similar manner to the above lever 77, against stop 171; levers 177 and 185 corresponding to levers 69 and 106 of the first embodiment, are also provided and act respectively against stops 176 and 175 carried by rod 26. Levers 181 and 185 are moved out of the path of stops 171 and 175 whilst the engine is inoperative by a spring 205, on starting the engine a feed pump 16, Fig. 1, causes a piston 199 to move the shaft carrying the levers so that the levers are moved into the path of the stops.