engleski

Reversible Planetary Gearsets Controlled by Two Brakes, for Internal Combustion Railway Vehicle Transmission Applications

Internal combustion powered railway vehicles require extremely rugged and reliable transmissions. While high-powered applications use electric or complex hydrodynamic transmissions, in the low to medium power range of railway vehicles, transmissions derived from ordinary highway truck or bus automatic transmissions and hydromechanical transmissions, are used. Modern railway vehicles must be able to operate in both directions at the same speed, which is particularly important when units from the same series are connected in a multiple unit lash-up. Simple hydrodynamic and mechanical transmissions are commonly used in such vehicles, but planetary gear trains are also suitable for the application, either as an output gearbox or as the main transmission gearbox in the case of simpler vehicles. This planetary gearbox is designed to provide two equal transmission ratios, however with the output shaft rotating in different directions. Design priority should be given to clutch-type brakes for compactness and reliability, however band brakes should have priority for ease of maintenance is a priority. Additionally, the gearbox design should give priority to boxes that do not experience power circulation, and do not require hollow shafts or complex planet carrier arrangements. The application of planetary gearbox designed according to the guidelines laid out in this paper would simplify the design and manufacture of hydrodynamic, hydromechanical and mechanical transmissions for railway vehicles.

Railway vehicle ; mechanical power transmission ; reversible planetary gearbox

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