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Leyland Patent Gearbox Servo-Control

13th January 1956
Page 84
Page 84, 13th January 1956 — Leyland Patent Gearbox Servo-Control
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Which of the following most accurately describes the problem?

PATENT No. 740,459 (Leyland Motors, Ltd., Leyland, Lancs.) describesthe hand-control member of a large epicyclic gearbox in which the bands are moved into action by servomotors. No details are given of the

gearbox itself.

The driver's hand-lever is shown in the drawing. When racked to the right or to the left the lever depresses one of the control valves (1) and oil or a'r under pressure is admitted to the servomotor coupled to the corresponding gear unit. The rocking members (2) are three in number, and lie side by side. Their top faces are part of a sphere struck from the pivot centre of the hand-lever.

By moving the lever at right angles to the plane of the paper, it can be made to work any one of the set of rockers. Its movement thus resembles that of a conventional gear-lever. A • reverse catch can be incorporated if necessary.

A SIMPLIFIED FUEL-FEED PUMP TO raise fuel from tank to injection pump is the chief purpose of a small pump shown in patent No. 740,582 (C.A.V., Ltd., Warple Way, London, W.3). Its chief virtues are its simplicity and effective action. The piston (1) is spring-returned and is reciprocated by.a. rocker (2) worked by the camshaft, with possibly a manual extension. The pump chamber is the space below the piston and it is made fluid-tight by a sealing ring (not shown) around the tappet (3).

The inlet and the discharge valves are identical units, their position deciding their action. The inlet valve (4) is kept in place by a spring, whilst the discharge valve (5) is held by a yoke, subject to the force of the piston return spring. The fuel passes upwards through the hollow piston and traverses a filter (6) on its way to the exit (7).

A NON-CREEP TYRE RIM

WHEN a vehicle has to be used on VI' soft ground, or on sand or mud, it is a well-known practice to lower the tyre pressures considerably so as to obtain a larger area of contact. The normal tyre, however, when used in this way, tends to creep on its rim and ultimately tear out the valve. A rim designed expressly to prevent this forms the subject of patent No, 740,878, from The Firestone Tire and Rubber Co., Akron, Ohio, U.S.A.

The design is applicable, to the American type of rim having a detachable side-wall. The left-hand side of the rim is conventional, having a conical portion (I) up which the tyre is forced into a tight fit by the inflation.

The chief feature of the invention is

the provision of another conical fitting on the right-hand side. This consists of a split-ring (2) which, when inserted between the rim and the bead, creates a tight fit on this side also. The ring traps the side-wall (3) when it is snappedinto position behind the lip (4) on the rim. It can be forced into or out of position by means of tyre-levers.

The patent states that a tyre rated at 60 p.s.i. for road work can be deflated to as low a figure as 12 p.s.i. when run on soft mud.

THE LATEST ROVER GAS TURBINE

PATENT No. 740,904 appears in the joint names of the Minister of Supply, and The Rover Co„ Ltd., Meteor -Works, Solihull, and discloses' a design for an improved gas turbine. No mention is made of its purpose, but from the layout it can be surmised that it could be used in a road vehicle.

Only one short main spindle is used; it carries at one end the compressor (1) and at the other the power turbine (2). The drive is taken by spur gears (3 and 4) which give a high reduction to the_ output flange (5). The gas output could alternatively be used further to drive another turbine, A pair of bevels (6) couples the drive A ROLLER-BEARING DESIGNED BY ROLLS-ROYCE

A MODIFIED roller-bearing which, it is claimed, is less likely to fail under load, is shown in patent No. 740,703 (Rolls-Royce, Ltd., Nightingale Road, Derby). The improvements may also be applied to ball bearings.

The chfef difference from a standard bearing lies in the form of the spacer elements between the rollers. The drawing shows one such member in place between two rollers.

The spacers are separate pieces and are made with only a slight clearance between their concave faces and the rollers; 0.005 in. on the radius, There is a greater difference in curvature between the top face (I) and the outer race, so that during running the spacer can tilt slightly.

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