points of the teeth coinciding, as in the usual practice, these teeth are actually staggered so that all the pearly whites on one side of a wheel are opposite the spaces between your tooth belonging IC) the other half of the wheel. It is discovered that these gear wheels arc practically noiseless owing to the absence of back lash. The clutches that control the locking of the tires giving the various gear ratios are often adjusted to have up put on, without dismantling the gear-box.

they run in bushes of phosphor-bronze, and ball-bearings are interposed between the ends of the worm and the bushes. The illustration of the complete back axle shows the routine which is made for commercial cars, and the differ ential gearing, which is definitely of the bevel pinion type, is contained within the worm wheel.

THE ENERGY Plant Company also causes a speciality of a gear-box, the wheels in which are always in mesh, and are locked by way of friction clutches. The gear wheels are all of the double helical type, and the cutting of this forms the main topic of a individual patent. Rather than the central

The manufacturers claim that, by this specific system, only to per cent. of the energy is lost in friction. The most common practice is to cut the worms with a single thread, but, for reductions of speed between the worm and wheel of significantly less than 8 to 1 1, multiple threads are used. The complete unit is supplied in a dust and oil-retaining case, which includes an inspection starting at its upper part. In the standard style the worm is positioned beneath the wheel, where it revolves in a bath of oil. The worm shafts are made of mild steel, and are afterwards hardened and surface true;

The ” Globoid ” Worm Gear.
The gear can be adapted to a number of purposes, such as driving equipment tools, hoisting equipment, or in practically any case where a silent reduction of initial quickness is desirable. The makers contain turned their attention to the requirements of the motorbus and lorry builder, and so are now prepared to supply full hack axles for just about any type of car which is motivated by a cardan shaft. The worm wheel in this particular system has, instead of the usual cut tooth, revolving rollers which happen to be carried on hardened, and ground, metal pins fixed into the circumference of the nice wheel. The rollers, as may be observed in the illustration, happen to be of conical form, and the worm is lower to fit these accurately. The components for the different parts are selected in such a way that the metal used in the making of the rollers is normally softer than either the pins, on which they revolve, or the worm. As a result, if any wear should happen after long use, it is an easy matter to replace the worn rollers. This characteristic is an important one on the rating of economy, because instead of the whole of the worm and wheel having to be changed at a heavy cost, only the small parts need to be renewed.

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