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Before the invention of precombustion chamber injection, air-blast injection was the only way a properly working internal air fuel mixture system could be built, required for a Diesel engine. During the 1920s, [2] air-blast injection was rendered obsolete by superior injection system designs that allowed much smaller but more powerful engines ...
The fuel pump is mounted above the cylinder head and driven by the camshaft, [21] the air-blast pump is cast onto the cylinder and driven via a lever by two connecting rods from the engine's piston rod. [26] Like all air-blast injected diesel engines, the Motor 250/400 has a compressed gas bottle for the injection air. It is made of welded ...
In 1872, George Bailey Brayton obtained a patent on an internal combustion engine that used a pneumatic fuel injection system, also invented by Brayton: air-blast injection. [21]: 413 In 1894, Rudolf Diesel copied Brayton's air-blast injection system for the diesel engine, but also improved it.
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In this manner, the engine fired on every power stroke and speed and output were controlled solely by the quantity of fuel injected. Bosch later further developed this type of metered injection system. In 1890 Brayton filed a patent (granted in 1892) for another 4 stroke engine with an air blast fuel injection system ( U.S. patent# 432,260) .
The pump's air intake is filtered by a rotating screen or the vehicle air filter to exclude dirt particles large enough to damage the system. Air is delivered under light pressure to the injection point(s). A check valve prevents exhaust forcing its way back through the air injection system, which would damage the pump and other components.
Conventionally, a four-stroke (petrol or gasoline) Otto cycle engine is fueled by drawing a mixture of air and fuel into the combustion chamber during the intake stroke. This produces a homogeneous charge: a homogeneous mixture of air and fuel, which is ignited by a spark plug at a predetermined moment near the top of the compression stroke.
The air valves are also driven by eccentrics from this same shaft. Like the beam engines, the main force of the piston is transmitted to the air cylinder by a purely reciprocating action and the flywheels exist to smooth the action of the engine. To permit adjustment, the steam piston rod only goes as far as the crosshead. Above this are ...