Static analysis and parameters synthesis of planetary-layshaft transmissions with three power flows

Abstract

The increase in the number of transmission ratios in the vehicles gearboxes leads to an increase in the number of mechanisms used and their complication. One way to obtain simple designs of multi-speed transmissions with smaller number of gears, clutches, brakes and synchronizers is to use combinations of planetary differential gears and gears with fixed axes (planetary-layshaft transmissions). The article presents a static analysis of a planetary-layshaft transmissions with three parallel power flows for obtaining the dependencies between the gear ratios of the internal mechanisms and the speed ratios of the transmission. A technique for determination the gear ratios of the internal mechanisms for providing a close to a given series of transmission ratios is described.

Gear ratios calculation for planetary-layshaft transmissions with three power-flows

“…A double reduction in the loads acting on the internal parts of the transmission is achieved with parallel power pass along two branches [4]. Planetarylayshaft transmissions contain two differentials and three sets of gears with fixed axles, it allows to get 2.5-4 times more speeds compared to the transmissions with two power flows [5] and the loads reduction acting on the internal links is achieved by more than 65 % on three stream mode [6].…”