Leyland

8th November 1935, Page 179

8th November 1935

Page 179

Page 179, 8th November 1935 — Leyland

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The Cheetah 32-36-seater. New Leyland Power Units. Much-improved Torque Converter on Double-decker

Stand 73

Ooutstanding interest on the Leyland stand is the new Cheetah, model L.Z,2. It is equipped with a Leyland six-cylindered oil engine of 4.7 litres capacity, the bore and stroke being $+ ins. and 5 ins. This unit develops 71 b.h.p. at 2,200 r.p.m., the governed speed. It employs the antechamber combustion system, and the installation arrangements are so designed that it is interchangeable with the petrol unit.

Details of interest in this engine are the seven-bearing case-hardened crankshaft, which incorporates an oscillation damper and has 21-in, diameter journals, the use of aluminium-alloy tophalt big-end bearings and the fact that screwed-in Valve seats are employed, the exhausts being SteHite faced.

The transmission system is of orthodox construction) incorporating in the underslung worm-type axle, 11-in. diameter nickel-chrome steel shafts with forged star ends..

The wheelbase of this chassis is 17 ft, 7 ins„ and it _weighs 3 tons 21 cwt., whilst the complete vehicle laden scales under 7 tons.

Another interesting exhibit is the recently introduced Cub 4-ton goods chassis, model S.K.Z.3. This is shown with a Leyland six-cylindered petrol

engine installed. The dimensions in• this case are 3+ ins, bore and 5 ins. stroke. It develops 85 b.h.p. at '2,500' r.p.m., and, as in the case of the Cheetah, is interchangeable• with the corresponding Leyland oil engine:

This petrol power unit being of comparatively recent introduction should be investigated. It has a cast-iron onepiece crankcase and cylinder block, with a detachable head. The valves are of the overhead type, operated by push rods, and, as in the oil engine, the valve seatings are screwed in.

A 12-in, diameter single-plate clutch transmits the torque to a four-speed unit-built gearbox with silent third.

Another interesting passenger chassis on this stand is the model T.D.4—a double-decker with the Leyland allnietaL body of the 'llybridge type. It is equiplvd with an 8.6-litre six-cylindered oil engine; which develops 01 b.h.p. at 1,900 r.p.m.

Of this vehicle the special feature is undoubtedly the Leyland hydraulic torque converter. A number of minor improvements has been effected to this unit during . the past year, and its efficiency has been considerably enhanced. Being the only hydraulic device which actually takes the place of the gearbox, that is marketed on commercial vehicles in this country, it deserves to be regarded as of special interest. Among the improvements are the new design of blade, which is claimed to increase the range of I efficiency of the apparatus.

A direct drive, for running at normal speed, is employed. The device now has metallic oil seals of a new, type, the free wheel is immersed in oil and the reverse gear is engaged by means of a dog clutch. A special Still tube radiator is employed for cooling the converter fluid.

An example of the Octopus rigid eight-wheeler is also to be seen. It isexhibited as a tilt van, and is equipped with the same Leyland 8.6-litre oil engine as the T.D.4 double-decker. This machine is, of course, steered by means of the four front-bogie wheels, whilst the drive' is by the four rearbogie wheels, overhead worms being used. The weight of this chassis is just under 6 tons.

Finally, visitors should inspect the Beaver 4 6s8-ton goods vehicle, model T.S.C.11. In this is mounted a Leyland 5.7-litre oil engine having four s cylinders and developing 70 b.h.p. at 1,900 r.p.m. It is of the direct-injec-: tion ,type and interchangeable with a corresponding petrol engine. In general layout it resembles the oil engines already described, and the chassis is of conventional design.—Leyland Motors, Ltd., Leyland, Lancs.

Leyland

Page 179

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