Hydrostatic Transmission Design for Buses
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riA COMPLETE detail design for a hydrostatic transmission intended for use in a motor bus has been completed and the basic units constructed, according to the annual report of the National Engineering Laboratory (D.S.I.R.) at East Kilbride, Glasgow. This development was foreshadowed in the October 13, 1961, issue of The Commercial Motor, when it was reported that Bristol Commercial Vehicles Ltd. was experimenting with such a transmission in association with the National Engineering Laboratory. At that time
no actual parts had been made, although it was understood that a prototype transmission would soon be manufactured and be installed in a Bristol Lodekka double-decker bus.
The annual report also reveals that a lightweight version of the transmission has been fitted to a Triumph Herald 1200 car for test-bed purposes. Following initial trials, modifications are being made to the final drive ratio and to the circuit to reduce the weight and to improve the performance of components ancillary to the transmission.