| 摘要 |
1,263,777. Spray carburettors. BENDIX CORP. May 8, 1969 [May 8, 1968], No.23476/69. Heading F1B. Air/fuel mixture supply and mixing means comprises a primary mixture conduit 22, Fig. 1, an air-flow responsive valve 16 controlling the total air-flow and connected to fuel-flow control means to vary the fuel-flow rate, a secondary conduit 24, first and second throttle valves 42, 44 associated respectively with the primary and secondary conduits and control means for the first and second throttle valves. The carburettor 10 has an air valve 16, which opens in response to increased air-flow, and primary and secondary conduits 22, 24 in which throttle valves 42, 44 are controlled so that valve 42 is nearly wide open before throttle 44 begins to open. Opening of valve 16 causes a cam 36 to act through a spring- loaded lever 34 on a needle valve 30 to control the fuel-flow to conduit 20. Conduits 22, 24 respectively connect with conduits 122, 124 in a manifold 12 and the conduit 122 passes into the conduit 124 near to the inlet passage in the cylinder head. The primary conduit 124 may be heated by the exhaust passage. Operation. Mixture is formed in conduit 22 the fuel supply being proportioned to the total airflow past valve 16. At low or idle speeds the mixture flow is controlled by throttle 42 and, since conduit 122 has a small cross-section, a high flow-rate is maintained thereby preventing fuel condensation on the conduit walls and providing proper mixing. At a predetermined point valve 44 begins to open allowing air to enter through conduit 24, the fuel supply to conduit 22 being proportionally increased. |
