Airstream Control for Petrol Feed
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• A Résumé of Recently Published Patent Specifications Obtainable from the Patent Office, Price 1s. each
STATED to be specially suitable for L..../large vehicles, a substitute mechanism for the usual type of carburetter is shown in patent 508,345 by P. L'Orange, Stuttgart-Feuerbach, Germany.
The jet (2) in this design is located in the air passage immediately in front of the inlet valve. Located, also, in the air inlet is a pivoted spring-loaded vane (1) which is subject to a force varying with the square of the air velocity. This vane operates a needlevalve (6) which controls the petrol port (4). In action, petrol arrives in full-charge pulsations, from a pistonpump at the port (3), and the needle valve permits the escape of a variable portion of the charge, via the by-pass (5). The remainder flows to the jet and is sprayed into the air stream.
Pressure-unloading scheme for Injection Pumps.
rro ensure rapid closure of the nozzle needle, and to prevent dribble therefrom, are the objects of a design shown in patent No. 508,406, by J. Greenwood, A. Blacew, and the Burnley, Colne and Nelson Joint Transport Committee, Burnley, Lancs. The desired results are attained by the use of an improved form of delivery valve in the injection pump, consisting of a sliding plunger (3), drilled for the passage of fuel, and held on a conical seating (2) by spring pressure from above. The same spring also closes a ball valve which seals the bore of the plunger (3). Upward movement is limited by an abutment (1).
In operation the fuel charge first lifts the plunger (3) from its seating and carries it to the shoulder (1); the ball valve is then lifted and injection takes place. When the ,pump pressure relaxes the ball valve closes and the plunger descends, thus reducing immediately the line pressure by increasing the effective volume of the piping system..
An Hydraulically Operated Clutch.
ACCORDTNG to patent No. 507,988, by A. Kegresse, 34, Avenue Iloche, Paris, hydraulic clutches, as hitherto constructed, have suffered from a lack of elasticity in the operative portion, so much so as to render the apparatus
A44 of little use. The patentee proceeds to describe a scheme in which this defect is absent.
Referring to the drawing, the driving shaft (2) carries the flywheel and friction discs, between which the driven disc (3) is gripped. The operating mechanism comprises a double-walled inflatable chamber (1) which is connected to a controlled source of hydraulic pressure v.ia a port in the driving shaft.
The flexible chamber is made with a thin wall on the left and a thicker wall on the right, and it is this feature that gives the smooth take-up and the improved elasticity.
Novel .Multi-cylindered Engine.
AN unorthodox disposition of the parts of a multi-cylindered engine forms the subject of patent No. 507,821, from A. Tebaldi, 89, Via Monte Rosa, Milan, Italy. • This inventor arranges the cylinders of his engine with their heads in proximity, and a common combustion chamber is employed for half the number of cylinders in the unit. The drawing shows a six-cylindered engine firing in two groups of three ; each group meets in a common com
bustion head (2 and 5). A single rotary valve (4) controls both groups, admitting mixture from a conduit (6) and exhausting out of a passage (3). Each cylinder has its own crankshaft (1) and this is provided with pinions meshing with a large central gearwheel. An Ingenious Electrically Operated Injection Valve.
AN electrically operated fuel injector, working on a little-known electric principle, is shown in patent No. 507,617, by Auto-Union A.G., Chemnitz, Germany. Electro-magnetisin has been proposed as an operating means, but as a magnetic field of sufficient strength takes a certain time to build up, its use is not suitable for high-speed work.
If a rod of nickel-iron alloy be magnetized, its length will increase; the. elongation i s small but powerful, and disappears with the cessation of the magnetiz ing current, This principle, known as " magnetostriction," is used in the present injector.
In the drawing, the specialalloy rod (3) is mounted crosswise in the body and surrounded by a magnetizing coil. The rod is a tight fit, endways, in a U-shaped metal strip (5), provided with two bulges (4). When the rod (3) expands, these bulges act as fulcrums and deform the upper part (2) of the U-strip into the shape shown exaggerated by a broken line.
The needle valve. (1) is attached to the U-strip and is opened by the deformation of the bridge piece. The fuel is supplied from an hydraulic accumulator.