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A Leyland Nozzle-injection Arrangement

10th July 1936, Page 54
10th July 1936
Page 54
Page 54, 10th July 1936 — A Leyland Nozzle-injection Arrangement
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A Résumé of Recently Published Patent Specifications

'TO prevent fuel leakage from dilut ing the overhead-valve lubricant is the object of the scheme shown in patent No. 448,001 by Leyland Motors, Ltd., Richmond Road, Kingston, Surrey, and P. E. Biggar, 194, Moor Street, Toronto, Canada. As shown in the accompanying drawing, the injector is located in an angular position just clear• of the valve cover, so that fuel leakage, if any, occurs outside. The injector, although sloped at an angle of 20 degrees, projects far enough to reach the centre of the piston recess, this being slightly offset from the cylinder axis. The spray holes in the nozzle tip are drilled at an angle of 150 degrees, the injector being fitted with dowels to ensure the correct position for insertion.

Power-assisted Hydraulic Brakes.

ROM Societe Anonyme Francaise des Freins Hydrauliques Lockheed, 27, Rue Jules Verne, St. Ouen, France, comes, in patent No. 447,829, a scheme in which the power for bringing the shoes up to the drum is provided manually, whilst the actual braking force is supplied by a power boost. Referring to the drawing, the pedal shaft (I) operates the master piston (2) for the initial shoe movement. It will be noticed that the former also operates,' a bell-crank (7) which, in turn, moves a slide valve (5). • This valve controls a supply of pressure fluid (supplied from a power-driven pump) arriving at port 4; the bore 6 leads to the fluid storage tank. Operation of the bgllcrank thus applies pressure fluid to a second piston (3) attached to the rear of the master piston, which causes the manual effort to be followed up by a power boost.

A Clutch-plate Refinement.

I T is a well-known practice in the con

struction of multiple-disc clutches to dish the plates slightly so as to make them self-sepaiating when the load is removed, but even then they will often remain slightly in contact around their peripheries. Patent No. 447,886 suggests a remedy for this, consisting of a second bending operation across a diameter, so that when disengaged the contact is only on points. The patentee is 0. 0. Sane, 77a, Honsbergerstrasse, Reniseheid, Germany.

B44 Clutch Details by Borg and Beck.

IMPROVEMENTS in the distribution lof operating pressure form the subject of patent No. 447,969 by Borg and Beck Co., Ltd., Langham Street, London, W.1. In this patent the friction facing of a clutch is riveted to flexible tongues on the carrier disc, with the addition of small separate cushion members for the purpose of transmitting the working pressure.

Referring to the drawing, the central carrier disc (1) has openings at a number of points around its periphery, in which are placed small steel cushion springs (2). These are of cruciform or star-shaped outline, and are sandwiched in the carrier-disc openings by the two layers of friction fabric. Owing to the fact that the springs can be made of higher-grade steel than the carrier disc, the resiliency of the clutch is greatly improved, which results in even wear of the friction fabric.

A Saurer Valve-operating Gear.

DATENT No. 447,878 comes from

Societe Anonyme Adolphe Saurer, Arbon, Switzerland, and discloses a scheme for the operation of inlet and exhaust valves in cases where there are

two pairs per cylinaer. The system employs push-rods operated from the tappets, and the patent lies in the superstructure carried on the cylinder head. The accompanying drawing shows a plan view in which a pair of rocking shafts (2) carries at one end levers (3) to engage the push-rods, and at the other forked levers (1) which operate the valves.

The advantage is stated to lie in the unusual length, of shafts 2, which enables them to function as torsion springs, and softens the blow at high speeds, with several desirable results.

A Self-adjusting Brake Mechanism.

FROM E. C. Clench and Automotive Products Co., Ltd., both of Brock House, Langham Street, London, W.1, comes patent No. 447,923 describing a• self-adjusting brake-operating mechanism. This invention refers to the type of brake in which the shoes are ex panded by a pair of toggle levers. In the accompanying drawing the levers (2) are forced outwards by a cam (3) which moves angularly about the wheel axis. A pin (1) presses the shoe in an outward direction, by meeting with an abutment lever (4).

The patent is based on the automatic setting of this lever, an operation performed by a ratchet wheel (5), on the spindle of which is mounted a snail-cam (7). This cam determines the position of the abutment lever and is progressively moved by the action of a stationary.pawl (6) when the return movement of the shoes exceeds apredetermined amount. The ratchet teoth are proportioned so that excessive takeup will not occur as the result of heatexpanded drums.


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