A NEW METHOD OF ENGINE OPERATION.
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A Résumé of Recently Published Patent Specifications.
WRANZ LOUIS MADLER, of Berl.' lin, in specification No. 225,84(5, describes a method of introducing fuel into an engine which he claims will enable" the unit to develop high efficiency with any commercial fuel, whilst
between one-quarter and full load the weight of fuel consumed per brake horsepower will be practically constant.
The valve shown on the left is the exhaust, that to the right of it is for the inlet of air only, whilst that farther to the right is to allow the charge of highly compressed non-combustible mixture to enter the cylinder at a predetermined moment.
A pipe leading from the exhaust pipe conveys a certain amount of the spent gases to a mixing valve below the carburetter, so that a mixture of partspent gases and air can enter the carburetter at a fairly high temperature. The pump shown causes a vacuum when its piston is at its lowest point, draws mixture from the carburetter and, as it rises, cuts off communication to the carburetter and compresses the mixture. A spring-loaded valve opens automatically and allows the compressed mixture to be admitted to the cylinder at the right moment by the valve provided for that purpose.
The mixture formed in the pump is of 'such a rich nature that it is noncombustible, and can only be fired when it reaches the highly compressed air in
the main cylinder. The use of this system entails many additional parts, but if it gives the results claimed such additions would be justified.
A Roller Bearing for Heavy Loads.
KARL OSKAR LEON, of Sweden, in
specification No. 244,778, describes a bearing which is claimed to withstand heavier, load s than one designed on ordinary lines.
It is well known that the convex face of a roller cermet be in contact with its races, along which it rolls, all along its curved face, as a convex foller in full contact with
a concave race WGidndt be able to roll perfectly, and frtctionwould result.
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It is, therefore, common practice to strike the curve of the roller from a slightly smaller radius than that of the race, so that contact between the roller and its race only takes place near the Centre, as shown in the accompanying drawing. It will be seen from the dirtgrammatical sketch that the inner and outer rings oi the bearing have a groove cut in the centre, so that bearing can only take place between them and their housing .qr axle near the outer .parts, and that the section of the hearing forms a bridge, the roller pressingoin the centre and the housing or axle pressing towards the edges. It is claimed that when any excessive pressure conies on the bearing, such as sudden shock, the bearing being, like all steel, slightly elastic, can yield under the load so as to decrease the curvature of the race and allow temporarily of a slightly longer line of contact with it and the roller. This is claimed as an advantage which will enable such bearings to carry heavier loads and to be subjected to severe shocks without the usual damaging results.
Two New Split-pin Inventions. A SPLIT-PIN which requires no castellatiorts in the nut is shown in the specification of H. J. Millet, No. 223,912. The pin is so formed that its head engages two of the flats in the nut and so prevents rotary movement.
The split-pin shown in specification No. 251,048, by W. Pickard, is one that requires castellations in the nut, as, on being pressed right home, the end, which is bent over on itself, -forms a barb which springs open and prevents the pin from working out.
A Spring Drive. A DRIVE which allows of a limited
amount of yield to relieve the transmission from shocks that may come from a too sudden application of the clutch is described in specification No. 251,529, G. A. Chritton, of Chicago. This device does not appear to be a coupling that will admit Of one shaft assuming an angle with another, as it is merely a
The Standard Guide to Operating Costs and to Haulage Charges is the 8-page quarto Pamphlet entitled: "'The Commercial Motor's' Tables of Operating Costs for All Types of Commercial Motor Vehicle."
A copy will be ient MEE ON REQUEST to the Editor The Commercial Motor." 7-15, Rosehery Avenue, London, E.C.I.
spring drive. Two flange are opposed and are held-apart by a rong spring, which acts in compression only.
One of these flanges is a tached to the driving shaft, whilst the other is attached to the driven shaf A number of bolts with spherical head connect the two flanges, and so long no drive is being transmitted these bol s lie parallel with the axis of the shaf s, but when torque is being transmitted they assume an angle with the axis o the shafts, which has the effect of rawing the flanges closer together anti compressing the spring, and by this me as provides a spring drive. It will be -ecu that one of the flanges is integral wi h one shaft, whilst the other is mounted on a slidahle spherical collar. A squa is provided on the end of the stub sha it, which fits loosely oil a square hole in e rotatable flanges. By this means th amount of yield is limited, and the ove straining of the spring is prevented. It is a curious fact that so little attenti n has been given to the introduction f a spring drive for heavy vehicles.
So far as we can tell, t ere is only one model on the market w ere any device of the kind is employed and we believe that in that model it has proved highly successful.
A Remedy for Roll rs that are Inclined to 1st.
ej B. MACKEY, in spec'fication No.
251,101, describes ho rollers in conical bearings are incline to twist on their axes so that they bee heavily towards their ends on the outer ring, thus causing premature iailure. He points out that by varying he itugle of the outer and inner rings nd by employing taper rollers this d fficulty has been overcome, but says that such rollers require greater accur cy and that this increases their cost. T e specification describes a bearing i which the inner and outer rings are g ound to the same angle, thus leaving a parallel space between them. This space is filled with a number of rollers, all of the same diameter.
To avoid the injury that may occur from the tendency of such rollers to twist their axes int:
relation to that of the axl , he forms a radius in the corners.'