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This paper highlights several aspects regarding energetic and functional advantages of hydraulic transmissions based on adjustable volumetric machines, located in their primary and secondary sectors. To this end, numerical simulations were performed upon hypothetic hydraulic transmissions of primary or secondary adjustment, as well as numerical simulations and experimental research on MOOG radial piston pump type RKP-D. This servo pump, which can operate either in closed loop of flow or in closed loop of pressure,...

The paper presents a hydraulic system used for the recovery kinetic energy from the road motor vehicle in the braking phases and using it, in the acceleration phases, in order to energy saving of the motor vehicles. All the system is conceived like a mechatronics system, for the medium and heavy motor vehicles. The hydraulic system allows the extrapolation to different sizes of vehicles and can be mounted on new motor vehicles, as well as old cars, in the framework of rehabilitation actions. The energy recovery hy...