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An Engine-oiling Safeguard

26th April 1932, Page 76
26th April 1932
Page 76
Page 76, 26th April 1932 — An Engine-oiling Safeguard
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Which of the following most accurately describes the problem?

rilEE name of Aveling and Porter,

Rochester, appears in patent No. 369,280, which relates to a device that will cut off the fuel supply. of an oil engine should the. forced-feed lubricating system fail through any cause ; it also enables an engine to he started by manually opening a valve which will remain open long enough for the oilpressure system to build up sufficiently to ensure a constant supply.

The sectional view shows a casing with a central bore for a sliding plunger, and two cross passages, the upper being for lubricating oil to pass on its way to the engine and the lower for fuel oil to pass to the fuel pump. As shown, both passages are clear, the plunger being held down by the pressure of the lubricating oil, the reduced part of the plunger allowing the fuel oil to pass.

S.houlcl, however, the lubricating-oil pressure fail, a spring will cause the plunger to rise and cut off the fuel supply and so stop the engine. Starting is effected by depressing the plunger by means of the bell crank, which may be connected to any convenient part for operation by the driver. The act Of depressing this allows fuel oil to occupy the space above the enlarged part of the plunger, which acts as a dash pet, holding the lubricating oil passage open for such a length of time that the oil pressure can build up sufficiently to hold down the plunger.

Promoting Turbulence in Compression-ignition Engines.

IN patent No. 369,229, by H. R. • Ricardo, 21, Suffolk Street, London, S.W.1, a novel form of head is described

which causes turbulence in the air at the end of .the compression stroke. As will be seen from the drawing, the cylinder bead is provided with two recesses, one being central with the main bore, whilst the other only slightly overlaps the bore.

A communication between the two recesses is formed on an angle, so that air passing from one to the other will do so in a tangential direction. The piston is formed with a projection, 054 which, when up, nearly fills the central recess, so driving any air from' there to the eccentric recess and causing a swirling action in so doing.

Jets for the introduction of fuel are situated in the eccentric chamber, and the spray from them is carried with the swirling air and can pass to the cylinder by, the means for communication shown in the plan view.

Ventilation and Dust Exclusion for Dynamos.

APPEARING in patent Nos. 869,532

is the name of Robert Bosch .Aktiengesellschaft. The invention is a means for ventiliaing dynamos, and, at the same time, preventing the access of dust, whilst permitting damp, due to condensation, to escape.

The end beating is supported by a spider with arms so placed that they leave a clear space at the bottom. This is covered by a metal dome provided with perforations at its lowest part, the perforations being covered with a layer of felt, and then with a perforated plate. By this means it is claimed that air for ventilation can pass through the felt and moisture can escape, but dust will be arrested.

A Carburetter Without Flat Spots.

SPECIFICATION No. 357,284, by Armstrong Siddeley Motors, Ltd., and Cantrill, describes a carburetter Which, it is claimed, has no flat spots and weakening of• the mixture during various slow-running positions. The invention is an improvement on patent No. 273,891, by one of the present patentees.

The usual single slow-running duct is replaced by three duets, one above the throttle valve, and two which are below it when the valve is closed. Air is introduced into the slow-running mixture before it reaches the ducts.

When the throttle is completely closed the upper duct acts as a means for introducing the mixture, whilst the two lower ducts act as further inlets for air to correct the mixture. When the throttle is slightly open" the upper and middle ducts are acting to introduce mixture, whilst the lowest is admitting air to the mixture. When

the throttle opens still more all the ducts are admitting mixture. The device would appear to be simple and effective.

Automatic Governing by Means of the Fuel Supply.

A MEANS for governing by automatic ally controlling the fuel supply is described in the patent No. 369,541, of Robert Bosch Aktiengesellschaft. The drawing shows a pump in which the opening on the right is that through which the fuel is introduced, and the valve at the top is that through which it leaves.

On the left is the device which forms the subject of the patent. In the recess shown is a piston which is controlled by

a spring that can be regulated by the screw shown. It will be seen that the diameter of the piston is greater Than that of the opening leading to it.

The plunger is provided with a re duced part, and a groove (29) leading from the head to the reduced part. The specification points out that as the speed of an engine increases the pres sure in the pump chamber increases, owing to the

limited time the oil has to escape through the contracted aperture of the nozzle of the injection valve.

The spring-loaded piston can yield to the pulsations produced by the RP u m p , and the groove (29) can allow a certain amount of oil to find its way to the reduced part of the plunger, -from where It can escape when the plunger rises to the inlet port.

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