| 摘要 |
1,140,901. Valves. PETROL INJECTION Ltd., and H. E. JACKSON. 18 Feb., 1966 [26 Feb., 1965], No. 8528, 65. Heading F2V. [Also in Divisions F1 and G3] In a continuous, low-pressure fuel injection system an engine-driven pressure pump, Fig. 2, supplies fuel to a housing 32 containing an engine-driven rotor 33 which contains a ball 38 movable in a radial guideway formed by toothed members 37. The fuel pressure in the housing 32 assumes a level which balances the centrifugal seating force acting on the ball and fuel flowing round the ball passes via the central chamber 35 and relief valve 41 back to the float chamber 6. Relief valve 41 may be omitted. A fuel metering valve 13 has a piston 88, Fig. 5, and compartment 98 exposed to the inlet manifold pressure respectively via port 106 and flow restrictor 109 and via port 108. Diaphragm 97 is flexed to increase the seating force on valve 94 thereby decreasing the leakage of ambient air into chamber 61 and increasing the vacuum therein. Piston 88 moves to compress spring 102 which exerts an unseating force on valve 94 and takes up a position dependent on the inlet manifold pressure thereby pivoting cam 78 to move cam follower 80 thus rotating valve 67, Fig. 7, to vary the metering orifice defined between V-slot 68 and aperture 71 in sleeve 69 which in turn controls the fuel flow from inlet 75 to outlet 77. A screw 83 meshes with a gear 82 on sleeve 69 to provide datum adjustment of slot 71. |
