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Novel Design of Oil Engine

16th October 1936
Page 70
Page 70, 16th October 1936 — Novel Design of Oil Engine
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A Resume of Patent Specifications that Have Recently Been Published PATENT No. 453,287 bears the name of one of the pioneers of oil-engined vehicles in this Country, T. H. Barton, of Chilwell Road, Beeston, Notts, and describes an interesting departure from standard practice in oil-engine design. Describing first the combustion arrangements, the chamber consists o,f a circular space formed closely around the valve, widening in area towards the cylinder. One wall of the combustion chamber is constituted of a removable plug (2), and this provides an .easy and simple means for adjusting the compression to suit the particular fuel used. The injector may be placed in the centre of this plug, although in the accompanying drawing it is shown at the top of the combustion chamber.

The most novel point of the design is the use of one valve for both exhaust and inlet duties. This valve is mechanically operated and remains open for both strokes. The valve opens at the end of the firing stroke, moving over close to the plug (2), thus leaving a clear vertical passage for the combustion products. 'The air inlet (1) is positioned on the 'underside of the valve, and the induction of the exhaust blast is stated to draw in a supply of air in readiness for the down stroke of the piston ; this may be assisted by a supercharger if desired.

. The patent drawings being rather meagre, it seems a little difficult to understand what prevents the burnt gases from being redrawn into the cylinder on the suction stroke, unless, of course, a supercharger be used, in which case the pressure of the air would prevent a return.

Another Internal-combustion Turbine.

AFURTHER attempt to reach the goal of many inventors is described in patent No. 452,297, which shows a design for an explosion-operated turbine. The patentees are T. Jackson, 13, Circular Road, Denton, Manchester, and A. Davies, 23, Ashton Road, Denton, Manchester.

In this scheme, a number of combustion chambers (1) is spaced around E32 a circle, and fitted with exhaust "and inlet valves operated by a face-cam (2) on the central shaft. The chambers are charged with air (under pressure) and then fired by self-ignition from an injected stream of fuel, a sparking plug being employed for starting. So soon as combustion has occurred, the outlet valve is opened and the gases emerge into the turbine proper ; this consists of alternate rings of fixed and moving blades, in the well-understood manner. A discharge orifice (3) is provided at the end of the casing, for exhaust purposes.

A New Bosch Filter.

'r0 preserve the useful life of an injec tion pump, it is vitally necessary to employ an efficient filter in the fuel line, and such a device is shoWn in patent No. 452,781 by Robert Bosch, A.G. Stuttgart, Germany. The patentee states that, whilst felt discs toxin an admirable filter, the use of steel discs for a separating medium often permits the passage of fine

impurities. To overcome this, it is proposed to use soft felts (1) as the filter medium, in conjunction with separators (2) made from hard felt, or other similar rigid yet porous material.

A Berwlix Brake Refinement.

WHEN a vehicle is decelerating there is a transfer of weight from the rear wheels to those at the front, which may sometimes result in a rear-wheel skid. A scheme to redistribute the braking forces so that this does not occur is shown in patent No. 452,777 by Bendix, Ltd., and G. P. Roberts: King's Road, Tyseley, Birmingham.

Referring to the drawing, the pedal arm (1) normally presses on the middle of a compensator bar (3) to which are attached the front brake rod (4) and the rear rod (2). Lever 1 exerts its pressurethrough a small rocking lever (6) which carries at one end a gear segment (5) meshing with a rack on the compensator bar. In operation, a slight pedal pressure is transmitted to the middle of the compensator, and applies all brakes evenly, but heavy pressure overcomes the spring (7) and allows the gear segment to creep along the rack and thus move the point of application of the force nearer to the front-brake rod.

G.M.C. Sparking-plug Improvement.

'TO assist the cooling of high-duty 1 sparking plugs is the object of the design shown by General Mbtors Corporation, Detroit, Michigan, U.S.A., in patent No. 452,023. In this scheme, the porcelain insulator is coated at three points with metallic -copper. The method of coating forms the basis of the patent, and consists of the applicacation of a special varnish containing an excess of copper oxide ; the insulator is then fired in the usual manner, after which a second chemical operation reduces the oxide to metallic copper. This gives a metallic coating in molecular contact with the glazing, which is claimed to keep the central portion cooler than any previous construction.


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