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A Novel Bosch Injection Pump

19th February 1937
Page 54
Page 54, 19th February 1937 — A Novel Bosch Injection Pump
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PATENT No. 459,578 discloses the latest in injection pumps, and comes from Robert Bosch A.G., 4, Militer strasse, Stuttgart, Germany. In this design the pump cylinders are spaced radially around the central shaft, and the plungers are operated by a common eccentric. No return springs. are used,

pull-back motion being imparted by hook-under shoes (2) engaging with overlapping rings on the eccentric.

The fuel arrives at the inlet (1) and passes through the drilled shaft, arriving at the opposite end into an annular space (6). A bush (7) has, for each cylinder, a port (3), and it is through this that the fuel reaches the working space. The bush is the heart of the control mechanism, and is extended to the eye (4), which is subject to both rotary and sliding movement. If tlda be slid to the right the ports imme

diately become. subject to the rotary helical controlling edge (5), and this performs the quantity-regulating action in the well-known manlier, whilst if it he rotated slightly (by means of its casing and handle) the effect is to vary the timing of the injection.

This design gives a pump of extreme simplicity in the smallest compass without sacrificing any of the desirable features of the orthodox model.

An Improvement in Steeve-valva Driving Mechanism.

THE Burt-McCollum-type of sleeve valve, in. which the sleeve is given a combined circular and oscillatory movement, has hitherto been operated through a lug projecting from the sleeve bottom; that is, on an unguided portion. An improvement on this arrangement is shown in patent No. 459,702, by P. Burt, Hollybank, Silverwheels Crescent, Bethwell.

In this design the driving lug is situated approximately midway in the sleeve, and the upper half of the crankcase (3) is bored similarly to the cylinder. The sleeve is operated by a crank (1), driven by a pair of skew-gears (4 and 5), which, in turn, are driven from the crankshaft. The line of parting of the cylinder block and crankcase is on the axis of gear 5.

A German Coal-oil Combustion System.

THE adaptation of engines to suit home-produced fuels is proceeding epace in Germany, and in patent No. 459,215 (void) is shown a combustion system for use with. coal-distillate fuels of the lower grades. The inventor is J. Schroeder, 35, Moltkestrasse, Cologne. The injection system is unusual, there being a slight quantity of fuel introduced at the bottom dead centre. This is vaporized by the hot cylinder, without ignition, with the result that the compression stroke is made with a cylinder full of weak mixture.

Referring now to the drawing, this shows the combustion chamber (6) and an air chamber, between which a rifled passage (1) is provided. Two vis-a-vis injectors are Placed, in the chamber (6), and the assembly is housed in a double casing, containing a heat-insulating shell (2). In action, the weak mixture self-ignites at the end of the compres sion stroke, and is reinforced by an additional amount from the injectors. The rush of air from chamber 4 is rotated by the rifled bore, thus promoting intimate mixture. The one-way valve (3) is for use with pre-compressed air, either for starting the engine or for supercharging.

" A Carburetter for Assisting

Cold-starting.

AN auxiliary carburetter which is switched out of action by a rise it :engine temperature is shown in .patent No. 459,490, by Societe Anonym4 .5olex, 190, Avenue de Neuilly, Neuilly. sur-Seine, France. The novelty is in rendering the device heat-responsive. In addition to the normal parts, there is an extra fuel well (5), in which a -tube is immersed; this forms the auxiliary enriching carburetter, and its

mixture

Pipe 1

A slide valve (2) cuts the device in or out,. and this is moved into the " _position by a hand control. Its return (by spring) is delayed by a piston (4). moving in a dash-pot full of thick oil. This cylinder is subject to the engine temperature; as this increases so does the fluidity of the oil, with a proportionally quicker return to normal. The dash-pot piston is fitted with one-way valves so as not to impede its movement by hand, and the speed of return can be adjusted by a restricted orifice (3) in the by-pass pipe.

An Articulated-conversion Scheme.

rOUPLING a semi-trailer to a lorry ‘...,instead of to a bare chassis forms the subject of patent No. 459,553, by R. Southern and H. M. Barker, both of Brighouse, Yorks. The scheme envisages the pivotal mounting of the trailer on the rear of the lorry, the necessary space for the turntable being obtained either by shortening the body or by extending the frame members rearwardly.

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Locations: Cologne, Stuttgart

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