In the dual-clutch transmission, friction in the gear sets produces high transmission oil temperatures, particularly in the area of the clutches. The oil pump in the dual-clutch transmission ensures continuous circulation of the transmission oil so that the heat produced can be dissipated via the transmission oil cooling system.
In dual-clutch transmissions with electrohydraulic actuation of the shift forks, the primary tasks of the oil pump is to provide the appropriate oil pressure for operating the valves.
In dual-clutch transmissions with electromechanically actuated shift forks, the primary task of the oil pump is heat dissipation.