Reservoir for a hydraulic circuit

(canceled)

(canceled)

(canceled)

(canceled)

The hydraulic tank according to claim 10, characterised in that a radially-outer end of the channels (45,45′) is formed by the inner wall of the grip (11) of the cap (9).

The hydraulic tank according to claim 10, characterised in that the pitch (p) of the screw thread ranges from 3 mm to 4 mm.

The hydraulic tank according to claim 10 for use in a master cylinder, actuated by an actuating rod connected with a brake pedal and for delivering pressure brake fluid to brakes disposed at the wheels of a vehicle.

A hydraulic-fluid tank, comprising a casing, defining an inner space (3), a filling port (5) extending, on the outside of said tank, into a filling neck (7), which is provided with a screw thread having a pitch (p) that cooperates with an inner surface of the cap (9) to close filling port (5), at least one outlet port for the hydraulic-fluid flow towards a hydraulic circuit, means (43) for the connecting the inner space (3) of the tank with ambient air to sustain a fluid pressure therein a substantially atmospheric pressure, characterised in that said means (43) comprise first and second radially opposite vertical channels (45,45′) extending from a first lengthwise end (47) of the filling neck (7) to a second lengthwise end (49) of the filling neck (7), in the opposite direction to the first end (47) between the filling neck (7) and the cap (9), said channels (45,45′) being located in the filling neck (7) and intercept each trhred of the screw thread (26) of the filling neck (7) to provide a first flow path for ambient air and a helical passage (41) defined in part by a side (33) of the screw thread (26) that is perpendicular to the filling neck (7) and by a face (39) on an internal thread (32) of the cap (9) to provide a second flow path for amient air to avoid the development of negative pressure in the tank.