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An Air-cooled Oil Engine

7th March 1958, Page 80
7th March 1958
Page 80
Page 80, 7th March 1958 — An Air-cooled Oil Engine
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Aair-cooling system intended chiefly, but not, exclusively, for Oil enines is shown in patent No. 78-9,758. In this scheme, the . air not only cools the cylinders, but is' also directed tO a -heat, .exchange device which deals with the lubricating oil. • ,(F. Jacques and C. Redon, 26 rug de la ,Liberte, Vinc'ennes, Seine, France:)

The drawing; an end view, illustrates the main features of the layout. Mounted on the cylinder block is an air impeller (1) driven by twin triangulated`beIts also driving the generator 2). Theinjection pump is shown at 3. The impeller directs a blast of air directly onto the cylinders. These are finned and fitted with deflectors.

Part of the air blast is ducted down to the sump, where a ribbedbottom (4) is enclosed in a casing to form a_ heat exchanger. The path of the oil is arranged to divide the flow into numerous thin films, thus facilitating heat transfer.

The crankshaft has a large cavity inside each of its journals to provide as great an area as possible in contact with the oil. This is claimed to keep the working temperature loiv•enotigh to eliminate all risk of seizure.

A SIMPLE HEATER

A HEATING :4v/ice for warming a r-k cab interior and'demisting the windscreen is disclosed in 'patent No. 788,817, (United. Dairies (London), Ltd., and P. Tosvndrow, both of :„1,1 Petershureh Place, London., W.2.)

Warmed air from the radiator is collected by a 2-in, pipe which is closely attached to the side, of the exhaust mani._ fold. This imparts extra heat to the air which them passes into the further heater shown in the drawing.

This. unit contains a coiled pipe (1) through which flows hot water from the engine cooling system. The Pre-heated air enters the pipe 2, and after receiving additional heat froin the-coil is taped off at 3 to warm the cab and at 4 to. demist the screen. . • The motive force for, the air is provided by the forward motion of the vehicle pits the action of the radiator .fan. . , • AN OIL-CONTROL

PATENT No. 789,504 glows a %Pistonring which not only expands -into contact with the cylinder., wall, but also in an axial direction to maintain a close fit in the groove. It is intended mainly for oil-control purposes. (Thompson Products, Inc., 23555 Euclid Avenue, Peoria, Illinois, U.S.A.)

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The •drawing shows a section of the ring, located in its groove. A pair of thin rings (1 and 2) are chromium-plated to resist wear,and are split in the, normal manner to permit expansion against the cylinder wall.

. A spring-steel expander (3) behind the • thin rings exerts a force both radially outwards and in a direction at right-angles so that the Whole is sealed positively." As the expander makes eotitact at numerous points all round, the radial force on the sealing rings is uniform. Drillings (4) allow any trapped oil to escape through the piston skirt and drain back to the sump.

DRAG IN MAGNETIC CLUTCHES AN electro-magnet may still grip when , the current has been switched off, and this can produce drag in a magnetic clutch. Patent No. 790,097 shows a clutch in which two magnetic circuits in parallel are provided, only one being used for the drive. The other is small and saturated when in use, but at rest absorbs the residual flux that would otherwise cause drag. (Etablissements Ed. Jaeger, 2 Rue Baudin, LavalloisPerret, Seine,France.) A HYDRO-PNEUMATIC BRAKE PATENT No. 788,703 shows a braking system intended for the heavier types of vehicle. It refers to an airoperated brake which, for extra or emergency power, can be assisted by a hydraulic cylinder. (T. Fawick, 17815 Shaker Boulevard, Cleveland, Ohio, .U.S.A.)

• The drawing shows the scheme applied to a rear axle. The brake assembly is of conventional pattern and operated by a cam attached to the shaft 1. The shaft carries a lever arm which is linked to the pistonrod of an air-operated cylinder (2).

In normal use, compressed air is fed through the pipe 3, and moves the piston. The novelty of the scheme is that the piston-rod of the pneumatic unit is itself a hydraulic cylinder, sliding over a small stationary piston. This last component communicates with a highpressure hydraulic inlet (4). If this be opened, the unit is actuated by the additional hydraulic system which can be used either for boost or for an emergency.

RUNNING-IN OIL, ENGINES

THE running-in period of an oil engine can be reduced from several hours to a few minutes, according to patent No. 786.110. A solid lubricant is fed into the air intake, It consists of a mixture Of graphite and some metal salt, the latter being appropriate to the particular lubricating oil used (Jenograph. Ltd.. 13-17 Rathbone Street, London, W.I.) PNEUMATIC SHOCK-ABSORBER PATENT No. 788.973 shows a shockabsorber in the form of a tyre-like member lying horizontally while the load is vertically applied. No inner tubes are used, the beads being faced with a soft deformable material to effect a seal. (Continental Gummi-Werke A.G., Han. foyer, Germany.) ELECTRIC BRAKE CONTROL AA CONTROL resistance for electric' magnetic brakes is revealed in patent No. 789,356 (A. Kuhn, St. Gallerstrasse 334, Winterthur, Switzerland). A number of resistors in parallel is arranged to be switched in one by one to increase the current flow. The control may be by flexible cable or hydraulic means.

TYRE REMOVAL TOOL

TWO patents, Nos. 789,511 and 789,512, disclose a tool to facilitate the removal of tyres from rims, particularly when'•rusted on tightly. The:too; is adjustable to suit all the common sizes of tyre. (C. Athmann, Melrose, Minnesota, U.S.A.)

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Organisations: US Federal Reserve

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