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A Promising Infinitely Variable Gear

7th October 1938, Page 54
7th October 1938
Page 54
Page 54, 7th October 1938 — A Promising Infinitely Variable Gear
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A RES11171 of Recently Published Patent Specifications That are Obtainable from the Patent Office, Price 1 s. Each AN infinitely variable gear, operating on what is a sound and most promising principle, is disclosed in patent No. 490,927, by J. Wooler, The Willow Bungalow, West End Lane, Ruislip, Middlesex. This gear works on the principle of a variable-output•pump driving a liquid motor. Referring to the drawing, the input-shaft member (6) has a splined interior, in which slides a shaft (5). The latter has a sloping, eccentric, squared portion (2), which is almost true at one end, and has a maximum throw at the other. The whole shaft being capable of sliding, the amount of eccentricity applied to the" big-end " ring (3) is a variable quantity, and this forms the means for control.

The cylinders and pistons (4) thus form a variable-output pump which supplies oil to a liquid motor (1), the crankshaft of which forms the output shaft. The pump has automatic valves, but the admission and discharge of the motor cylinders are controlled by piston-valves (8), operated by a awash ., plate (9). The last-named can he moved to provide a reverse.

Straight-through drive is obtained by setting the awash-plate true and allowing the whole mechanism to rotate by releasing a band brake (7). The ratio is hydraulically controlled, the slider (5) being formed as a piston worked by oil pressure, directed as shown by the small arrows. Operating Vacuum Brakes on Oilers.

TN order to use suction-operated aux1 iliaries, such as brakes, on an oilengined vehicle, it is necessary (unless a separate exhauster be fitted) to use some form of throttle4alve in the air intake. An improved design of this unit forms the subject of patent No. 491,018, by T. Swinney, 40, Sheen Lane, London, S.W.14.

The aim of the invention is to provide two separate nassages in the air intake, one of which is controlled by a throttle-valve, whilst the other is, at all times, unobstructed. In the drawing, the intake is shown as a pair of concentric tubes, the inner one being formed with a spherical bulge (2). The outer tube contains a throttle-valve (3) fitting closely around the spherical portion; this creates a partial vacuum which is transmitted to the brakes, via passage 1. The unobstructed central portion prevents the possibility of the engine stopping through overthrottling, and so destroying the braking force at, perhaps, an urgent moment.

Camshaft-driven Injection Pump.

PATENT No. 486,191 refers to injection pumps of the single-unit type, and discloses a method of actuating the plungers directly from the camshaft of the engine. The patentee is S.A. Des Automobiles Peugeot, 68-104, Quai de Pay, Paris.

The drawing shows a general section of the engine, and this, in itself, is informative in that it features the present trend of Continental design. The pump-driving mechanism comprises a rocker (2) operated by an inlet-valve cam (3) at one end and moving the pump piston (1) at the other. The rocker oscillates on an eccentrically mounted pivot; this mounting provides the means for varying the timing of the fuel charge. Quantitative regulation is obtained in the orthodox manner by rotation of the plunger of the pump.

A Ball-bearing " Thread " Steering Gear.

EASE of operation and enhanced 1.4wairing properties are the chief advantages claimed for a design of steering gear shown in patent No. 490,938, by J. Douglas, Dirgarve, Aber

feldy, Perthshire. The outstanding feature of the design lies in the use of a screw-thread employing ball-bearing working faces.

The drawing shows a section of the nut with the screw in position. It is proposed to use but one turn for the ball-bearing portion, although the screw is, of course, many pitches in length. The balls roll as the screw is turned, and are successively expelled from the working space into a transfer groove (shown at the top), whence they are fed into the ingoing side of the helix. Several forms of construction are shown, the same principle, however, applying in all cases. Reference is made to an earlier patent. No. 361,204.

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People: T. Swinney
Locations: Paris, London

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