The Latest Minerva Gearbox.
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In our last two issues we have devoted some space to references, by our special correspondent, to the new Minerva 2A-ton lorry chassis, which is destined for service in London amongst other places. It may, be recalled that our representative was favourably impressed by much of the design of this new machine. 'Minerva workmanship has always claimed attention, and this most recent design is noteworthy in particular because of the evidence that those who have been responsible for its production have taken care to familiarize themselves with much that is most modern in commercial-vehicle practice.
We have thought it of interest to reproduce herewith a sectional-elevation drawing of the changespeed gearbox, and, although this is a technical drawing, it will, we imagine, he readily understood by the great majority of our readers, owing to the simplicity of its arrangement. It will be seen that a special grouping of the gears, and the employment with each pair of an internal-toothed type of clutch, has resulted in the evolution of an extremely compact design. A direct drive on the top shaft is obtainable, and the various lateral movements that are necessary, in order to secure the other three forward drives, can easily be traced by an examination of the drawing. The shafts are mounted on single-row ball bearings; the free gears and the spigot end of fife top
shaft run in gunmetal bushes. The reverse layshaft is not shown in the drawing, but is assumed to be behind the plane of the picture.