AT THE HEART OF THE ROAD TRANSPORT INDUSTRY.

Call our Sales Team on 0208 912 2120

A Two-dutch Transmission System

19th November 1948
Page 52
Page 52, 19th November 1948 — A Two-dutch Transmission System
Close
Noticed an error?
If you've noticed an error in this article please click here to report it so we can fix it.

Which of the following most accurately describes the problem?

A Résumé of Recently Published Patent Specifications.

THE double clutch, as a means for obtaining a larger number of gear ratios without adding to the complexity of the gearbox, appears to be growing in favour, and patent No. 604,178 shows an example. The patentees are C. Kegresse and others, Paris.

The arrangement described provides five speeds, one being a direct drive. In the drawing, one clutch disc (1) is attached to the central shaft which drives, via a pair of spur-gears (2), a layshaft (3). The right-hand clutch (4) drives gears (5) which rotate a second layshaft (6). The various ratios, are obtained by selective dog-clutching in the conventional manner; this mechanism forms no part of the patent.

The box is of compact outline; the layout shown is a developed view, as in the actual shape the three shafts are disposed at the corners of a triangle.

A DIFFERENTIAL THROTTLE COUPLING

A CCORDING to patent No. 603,956, 1-1 when two carburetters feed the same engine, it is an advantage that only one shall deal with the slowrunning, the second instrument remaining inoperative. As the former is opened, however, the closed one should

start to open at a faster rate until at full throttle, both are wide open. A linkage giving this action forms the subject of the patent, which comes from the Ford Motor Co., Ltd., 88, Regent Street. London, W.1.

The drawing shows the proposed linkage in diagrammatic form. The driver's pedal moves a lever (1) about a fixed point (2); this action moves the • right-hand throttle rod (3) towards the open position, but has no effect on the left-hand one, because its lever (4) simply pivots idly about point 5. When a certain angle has been reached, however. the last-named lever meets a stop (6) which arrests the upper end, and all movement thereafter is transmitted to both rods. The proportions 1118 of the levers are so arranged that the left-hand rod is moved at twice the speed of the other one, so that it can catch up and reach full-open position at the same time.

COMBUSTION SYSTEM FOR SMALL OIL ENGINES prevent rough running and high imomentary pressures are the aims of an oil-engine combustion system shown in patent No. 604,295, by H. Morris and G. Ericson, St. Louis, Missouri, U.S.A. The scheme is intended for the smaller sizes of engine having a cylinder bore of less than 5 ins, and under 7 ins. stroke.

The patentees state that in a small oil engine the fuel has to be injected in such a short time that there is a serious risk of the entire charge being present when selfsignition occurs; a state of affairs in which detonation is certain. The patent uses the term "like a charge of dynamite" in this connection. The difficulty is surmounted in this case by injecting the charge into a pre-combustion chamber from which the flame issues in a controlled stream.

The drawing shows a section of the proposed head in which the pre-combustion chamber (1) is located directly opposite the injector (2). The nozzle is aimed exactly at the central bore of the chamber, and during compression, the charge is carried into the chamber along with the compressed air. With this system, fuel injection must be complete by 10 degrees before topdead-centre. When ignition occurs, a rich flame mixture issues from the chamber and completes its combustion in the main space.

REMOTE CONTROL FOR TRACTOR GEARBOX

l

E rigorous conditions under which agricultural tractors work, render the usual car-type of .gear lever unsuitable,. and patent No. 604,409 shows an improved layout, claimed to be more resistant to rougit handling. The patentee is the Ford Motor Co., Ltd., 88, Regent Street, London, W.I.

In this scheme the gear lever is mounted just under the steering wheel, a position In which it is well protected. The action of the lever (1) is similar to that of a road vehicle; it can be moved to and fro and in an up-and-down direo lion. The end of the lever spindle is arranged to move a link (2) for operating the selector-bars (3); this gives two speeds in the same row. Up or down movement operates the other link (4) which selects another selector-bar. To restrict the lever to its operative range, its spindle is fitted with a finger which is limited by an "H" plate in the usual manner.

POWERED STEERING FOR TWO-WHEELED TRACTORS

PATENT No. 604,243 refers to two• wheeled tractors, and comes from R. G. Letourneau Incorporated, Peoria,

Illinois, U.S.A. The patent covers a power-operated steering system.

The drawing shows a general layout of the vehicle, which is steered by articulation about a large king-pin located high up behind the driver's cab. The pin is mounted about a horizontal pivot, so as to allow for differences in level between tractor and trailer.

Surrounding the pin is a tubular member (1) suitably journalled, and attached to the goose-neck drawbar (2). Carried also on the goose-neck is a box (3) containing an electric motor. This is geared down to a low speed, and drives a small pinion which meshes with a large gear attached to the tractor portion, so that when the motor is energized the tractor turns to the right or left according to the direction of rotation of the motor. The driver's control consists only of an electric switch of the reversing type; no mention is made of any alternative manual system.

Tags

Locations: Peoria, Paris, St. Louis, London

comments powered by Disqus