Patent ID: 7455049
Filing Date: 2008-11-25
Classification: F02M

Abstract:
1. An actuating mechanism of an hydraulically driven pump-injector for internal combustion engines, in particular for diesels, comprising: a body formed with internal working cavities, an inlet channel adapted to receive actuating fluid from an accumulator, and outlet channels adapted for exit flow of the actuating fluid from the body; a distributing device with a valve mounted in the body between said inlet and outlet channels, for providing actuating fluid to the working cavities; a leader power piston located in a first internal working cavity of the body; at least one follower power piston located in a second internal working cavity of the body such that the leader power piston is interposed between the follower power piston and the distributing device; a pumping plunger; the leader power piston, the at least one follower power piston, and the pumping plunger being adapted to move between an upper position and a lower position; the actuating mechanism being formed with at least one additional channel for connecting the second internal working cavity of the at least one follower power piston with the first internal working cavity of the leader power piston, when the at least one follower power piston is in the lower position; and a return mechanism for returning the leader power piston and the at least one follower power piston with the pumping plunger.