Patent ID: 7941996
Filing Date: 2011-05-17
Classification: F16H

Abstract:
1. An actuation system for a servo-assisted transmission; the actuation system comprises: a hydraulic circuit comprising a reservoir containing a control fluid, a hydraulic accumulator containing the control fluid that is pressurized, and a pump which draws from the reservoir and feeds the hydraulic accumulator; at least a hydraulic actuator comprising at least one actuation chamber and a mobile piston which slides within the actuation chamber; a solenoid valve for connecting the actuation chamber of the hydraulic actuator to the hydraulic accumulator and to the reservoir; and a recirculation circuit, which departs from at least one environment bordering with the actuation chamber of the hydraulic actuator and ends in the reservoir, wherein the recirculation circuit comprises a first collection chamber, which is arranged lower than the actuation chamber of the hydraulic actuator and is hydraulically connected to the reservoir, and wherein the first collection chamber comprises at least one through hole for connecting the first collection chamber to the external environment, and wherein the reservoir is sealed and isolated from the external environment so as to generate a vacuum therein when the pump aspirates some fluid from the reservoir.