The Control of Fuel Injection
Page 64
If you've noticed an error in this article please click here to report it so we can fix it.
in Relation to Speed
A Resume of Recently Published Patent Specifications
rpnE name Motorenfabrik Dents 1. Aktiengesellschaft, of Ccilogue-Deutz, appears in patent No. 345,932, which points out that in engines Of the airlessinjection oil-fuel type the combustion pressure rises considerably when the speed of the-engine -is ieduced. Therefore if the coinbuStion pressure be so adjusted that at normal speeds it attains the most favourable value corresponding with the lowest consumption of fuel and a permissible stress on the parts of the engine, then if the speed be decreased the combustion pressure rises to an amount which is not permissible.
It also points mit that this difficulty may not have been noticed, before, and gives many reasons for the pressure rising at reduced speeds.To overcome this defect is the object of the present invention, the means adopted being as follows:—
At each compression stroke fuel is fed from a pump and through the duet shown to the chamber of the nozzle. The needle (a) is held on its seat by the spring above it, nnd is raised by the pressure from the pump to deliver the fuel, its rise being regulated by , the spring pressure. Above the spring is a screw with a lever attached to it. This lever is connected by a rod to a governor. The specification goes on to say that if the crankshaft speed tends to rise, the action the governor will he to. throttle the fuel • supply to the cylinder, whilst under a tendency to reduce crankshaft speed the governor will act to increase the tupply of fuel to the cylinder.
This will prevent the engine speed falling below a predetermined safe rate and should promote even idling. neat and well-designed gearbox, the main claims being that the gears which are most used are near to hearings, that the shafts are short and that each is supported in three bearings.
The engine shaft is indicated by 2, whilst 3 is the driven shaft. A double dog can slide into engagement for direct gear and for second speed, whilst a double gear can be slid to obtain first and second gears. Gears 6 and 10 are in permanent engagement.
The operation is as follows :—First gear, 27 engages with 25; second gear, 26 engages with 24; third gear, 14 engages with 15, while dogs 19 and 17 engage; direct drive., dogs 18 engage with 16.
An Easily Adjusted Clutch Stop.
THE names of the Daimler Co., Ltd.,
R. C. Barry and C. M. Simpson appear in patent No. 345,965, in which an easily adjusted clutch stop is described. The object of the invention is to provide a means whereby a clutch stop may be adjusted in relation to the clutch pedal while the driver is in his seat.
The pedal lever (1) has attached to it a boss (4) carrying a sliding rod (5) which is _provided with nuts for permanent adjustment and a spring which acts against the short lever (6) which is mounted on a cross-shaft, the latter carrying the levers to which the segmental clutch stop is connected.
The levers 6 and 15 are keyed to the shaft, whilst lever 20 is free, and its position in relation to 15 can be adjusted by means of a screw (23), this screw being connected to the hand wheel by means of the short flexible shaft (32) and the sliding shafts and sleeve above it.
' A Toggle-controlled Exhaust Valve.
IN patent No.. 346,206, J. E. Serste,
88,Rile -de Wander, Laeken-Brussels, Belgium, describes": an engine in which the exhaust valve is operated by toggles, and the inlet valve by vacuum,
The advantage claimed over the usual plan is a more rapid opening andclosing of the, exhaust valve, The cylinder has no fixed .head to•it, atrunk forming the exhaust valve serving the purpose, and being held in place" against compression and • firing by means of the toggles shown; which, when the three joints are in line, offers a positive resistance to movement.
Within this trunk is a sliding sleeve which forms • the inlet valve, and is automatically operated by suction. Space 9 is in communication with the inlet pipe; 6 leads to the exhaust.
The cam above operates the toggles, and the four views represent suction, compression, firing and exhaust strokes.