HYDRAULICALLY ACTUATED CONTINUOUSLY VARIABLE TRANSMISSION FOR A VEHICULAR DRIVE LINE PROVIDED WITH AN INTERNAL COMBUSTION ENGINE

摘要

A hydraulically actuated continuously variable transmission (1) is provided with a hydraulic system (TH) for the control of the torque transmissible by the transmission (1) as well as the speed ratio provided by the transmission (1). The hydraulic system (TH) is provided with a mechanically driven hydraulic pump (PM) and with an electrically driven hydraulic pump (PE) for generating a pressurised flow of hydraulic medium for the actuation of the transmission. The electrically driven pump (PE) can be switched either downstream of, or in parallel with the mechanically driven pump (PM).