摘要:
A pump assembly (1), in particular for lubrication in helicopters (16), has a casing (2), the lateral wall (8) of which defines an intake port (38) and a delivery port (40); and the casing (2) houses two rotary pumps (34) powered by a drive shaft (3) via a motion-splitting transmission (66).
摘要:
A system (7) for cooling a transmission (6) of a hover-capable aircraft (1), the system having : a stator (3); a heat exchanger (8) connectable thermally to the transmission (6); a fan (9) for creating a current (P) of a first heat-carrying fluid from the heat exchanger (8) to the fan (9) itself, to remove heat from the heat exchanger (8); a rotary member (10), which rotates about an axis (A) to rotate an impeller (20a) of the fan (9) about the axis (A); and a bearing (16) supporting the rotary member (10) for rotation about the axis (A); the system (7) also having cooling means for cooling the bearing (16), and in turn having conducting means (40; 42, 41, 30, 29) for conducting a current (Q) of a second heat-carrying fluid along a path from an outside environment (50), external to the bearing (16), to and to cool the bearing (16) itself.
摘要:
A hover-capable aircraft (1) having propulsion means (6); at least one rotor (3); transmission means (5) for transmitting power from the propulsion means (6) to the rotor (3) and lubricated with a lubricant; a heat exchanger (9), which receives the heated lubricant from the transmission means (5) and feeds the cooled lubricant back to the transmission means (5); and a fan (10) for producing airflow through the heat exchanger (9) to cool the lubricant, and which has an impeller (16) with blades (21), and an exhaust pipe (18) for expelling the hot air produced by cooling the lubricant; at least one portion (23) of the wall (22) of the exhaust pipe (18) has dissipating means (25) designed to selectively absorb pressure waves in a given frequency band related to the rotation speed (V) of the impeller (16) and to the number (N) of blades (21) of the impeller (16).