Compact 10-speed Fuller gearbox announced
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ANEW model Roadranger gearbox, the RT-510 10-speed twin-layshaft unit, has been announced by the Fuller division of Eaton Yale & Towne Inc., and is being handled by E.N.V. Engineering Co. Ltd.. in Great Britain and on the Continent.
The new unit is designed to operate with input torques of up to 500 lb. ft., and is generally similar in layout to the existing 900 lb. ft. RT-910 and RT-915 models. The two lay shafts divide the engine input torque equally, and thus the load on each gear is halved. The mainshaft gears "float" between the gears of the twin layshafts, giving an even bearing on all gear teeth. The gears do not actually bear on the shaft except when clutched.
Since the torque is divided, the width of the faces of the gears can be reduced by approximately 40 per cent, claims Fuller. The gears do not need long hubs or bushings, and consequently a considerable saving in overall length of the gearbox is realized. This has advantages for short-wheelbase vehicles. The gearbox weighs 425 lb.
The 10 gear ratios are progressively spaced, and are operated by a single gear lever on which is mounted an air shift button. The front or main section of the box gives five speeds; the rear portion contains a synchronized two-speed range section, preselected by the control button and automatically air shifted when the lever is moved to neutral.
Standard SAE power take-off openings are provided, one at the side, the other below: First gear ratio is 9.00 to I. The other ratios are 7.02, 5.48, 4.26, 3.43,2.62, 2.05, 1.60, 1.24 and 1 to 17.