Patent ID: 8122713

Claim:
A hydraulic circuit of a servo-assisted mechanical transmission, which is provided with a number of hydraulic actuators provided with corresponding actuation chambers adapted to be filled with pressurized oil; the hydraulic circuit comprises: a number of solenoid valves, each of which is coupled to a corresponding actuation chamber of a hydraulic actuator; a tank, which contains the oil at atmospheric pressure and is provided with an upper loading aperture; a cap, which closes the loading aperture of the tank and is provided with a through venting hole which puts the tank into communication with the external environment; a hydraulic accumulator containing the pressurized oil; an electric pump which draws from the tank and feeds the hydraulic accumulator; a filtering element, which is coupled to the cap and is arranged under the venting hole; and an anti-splash bowl, which is coupled to the cap and is arranged under the filtering element so as to protrude inside the tank from the filtering element, wherein the anti-splash bowl has an inverted frustum-conical shape, including a wider part that faces upwards to be connected to the filtering element and a narrower part that faces downwards inside the tank, and is centrally hollow to define a passage for the air to and/or from the venting hole.