Textbook of Aero Engines |
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Common terms and phrases
altitude aluminum arranged Austro-Daimler barrel bevel gears big end bolts bore bottom bronze BUGATTI bushes carburetor cast clearance combustion compression ratio compressor connecting rod connecting-rod cooling crank chamber crank pin crankcase crankshaft cylinder head dead center diagram diameter drilled efficiency end bearing equation exhaust valve fitted flange float chamber four stroke cycle gases gasoline groove gudgeon pin heat holes hollow horsepower ignition inch inlet and exhaust inlet valve intake lever lubrication machined magneto main bearings manifold Maybach mean effective pressure Mercedes Metric mixture motor mounted nomogram Number oil pump operated P₁ phosphor bronze piston plunger ports pressure propeller end propeller hub rear end rings rocker arm rotation screwed shaft side spark plugs spindle spring steel stroke sump tank tappet temperature thickness throttle tion tube V₁ valve stem vertical volume water jackets water pump weight
Popular passages
Page 151 - No. 76, which is the idling jet, No. 76, No. 75. No. 71, No. 68, No. 57, No. 53. These jets progressively come into action as the throttle is opened. Gasoline is drawn into the jet through the small hole in the bottom of the threaded end, mixing with a certain amount of air sucked in through the four holes drilled in the barrel of the jet just above the threaded portion. This air is taken from the outside through the upper 'Ум in.
Page 91 - It has two venturi throats, in the center of which is placed the gasoline spray nozzle of conventional type, fixed size orifices, immediately above which are placed two panel type throttles with side outlets. An idling or primary nozzle is arranged to discharge above the top of the venturi throat. The carbureter body is of cast aluminum and is water jacketed.
Page 299 - The body of the water pump is attached to the top face of the separate aluminum easting which forms the cover of the magneto driving gears. This gear cover is attached by bolts and studs to the rear end of both the top and bottom halves of the crank chamber. As may be seen in the general arrangement drawing of the engine, the water pump spindle is driven through a dog clutch at its lower end by a short vertical spindle running in a bronze bush bearing; this spindle is driven by a bevel gear meshing...
Page 292 - Valves and Valve Gear The twin inlet and exhaust valves work vertically in cast-iron valve stem guides in the cylinder heads, and are operated by rocker levers mounted on roller bearings, each pair of valves being operated by a single tappet rod from one of the camshafts in the crankcase. Valves The heads of all the valves, both inlet and exhaust, are of the same diameter — ie, 54 mm., and the angle of the valve seatings is 30 deg. in each case. The inlet valves are machined concave under the head,...
Page 102 - In my estimation the intake pipe and carburetor arrangement on this are the best of any of the aviation engines. The lubrication also is different from any other aviation engine, since individual high pressure metering pumps are used to deliver fresh oil only to the bearings and cylinders, as was the custom in automobile practice some ten years ago. Effect of Offset Cylinders Two of the engines described, the Benz and AustroDaimler, have the offset crankshaft construction.
Page 95 - There are four magnetos mounted on the same axis, each pair being driven through a spur gear, which in turn meshes with a spur gear which is slidably mounted on a splined magneto drive-shaft. The magneto drive-shaft terminates at its forward end in the sleeve of a bevel gear, and is helically splined into the bevel gear so that when longitudinally displaced the shaft is also angularly displaced. This construction is...
Page 299 - ... is attached by bolts and studs to the rear end of both the top and bottom halves of the crank chamber. As may be seen in the general arrangement drawing of the engine, the water pump spindle is driven through a dog clutch at its lower end by a short vertical spindle running in a bronze bush bearing; this spindle is driven by a bevel gear meshing with the main bevel fixed on the rear end of the crankshaft. The water pump vertical spindle, which is 20 mm. in diameter, runs in a bronze bearing which...
Page 91 - The air before reaching the carburetor proper to some extent has cooled the oil in the crank chamber and has itself been heated to assist in the vaporization. The inlet pipes themselves are copper. All the passages between the venturi throat and the inlet valve have been carefully finished and polished. The only abnormal thing in the design of this...
Page 91 - The inlet pipes themselves are copper. All the passages between the venturi throat and the inlet valve have been carefully finished and polished. The only abnormal thing in the design of this engine is the short connecting rod, which is considerably less than twice the stroke and would be considered very bad practice in motorcar engines.
Page 299 - The lower half of the pump body is an aluminum casting with an inlet passage 5i mm. in diameter, to which the diagonal water pipe from the radiator is coupled by a rubber connection. The top half of the water pump body, which is a gunmetal casting, is formed with six helical passages leading in a reverse helical direction to the water pump rotor. These passages connect with the common vertical outlet passage in the top of tile body casting as shown in Fig.