Device for actuating mobile cowls equipping a thrust reverser
A device that is capable of actuating at least two cowls of a thrust reverser. The device includes for each cowl, (a) at least two actuators suitable for opening and closing the cowl, (b) at least one slave flexible transmission shaft establishing mechanical connection between the two actuators of the cowl and (c) at least one mechanical coupling device associated to the at least one slave flexible transmission shaft. The device is further comprised of one motor, and at least two master flexible transmission shafts, each master flexible transmission shaft establishing mechanical connection between the motor and one respective mechanical coupling device. Upon rotation of the electrical motor, the master flexible transmission shafts are actuated, which causes actuation of the mechanical coupling devices, which causes actuation of the slave flexible transmission shafts and thereby the extension or retraction of the actuators.
1. A device for actuating at least two cowls equipping a thrust reverser, comprising:
for each of the cowls, at least two actuators that are capable of opening and closing the cowl,
for each of the cowls, at least one slave flexible transmission shaft establishing a mechanical connection between the at least two actuators of the cowl,
for each of the cowls, at least one mechanical coupling device to connected to at least one slave flexible transmission shaft,
a single motor, and
at least two master flexible transmission shafts, each master flexible transmission shaft establishing a mechanical connection between the single motor and each of the least two cowls by one of the least one mechanical coupling device,
wherein the single motor is directly connected to the at least two master flexible transmission shafts,
wherein rotation of the single motor causes actuation of the master flexible transmission shafts, which causes actuation of the mechanical coupling devices, which causes actuation the slave flexible transmission shafts and thereby extends or retracts the actuators.
2. A device according to claim 1 , comprising:
for each of the cowls, the at least two actuators include two extreme actuators and one central actuator,
for each of the cowls, two slave flexible transmission shafts, each flexible transmission shaft establishing a mechanical connection between the central actuator and one respective extreme actuator of the two extreme actuators, and
for each of the cowls, one mechanical coupling device connected to one of the two slave flexible transmission shafts.
3. A device according to claim 1 , wherein the single motor is an electrical motor.
4. A device according to claim 3 , wherein the electrical motor is an automatically controlled synchronous motor.
5. A device according to claim 1 , further comprising a device for limiting a speed of the cowls at a beginning of the opening of the cowl.
6. A device according to claim 5 , wherein the speed limiting device comprises a control interface and a counting device to count a number of revolutions made by one of the master flexible transmission shafts.
7. A device according to claim 6 , wherein the counting device comprises a resolver or a sensor.
8. A device according to claim 1 , wherein the at least two actuators are ball screw actuators.
9. A device according to claim 2 , wherein the single motor is an electrical motor.
10. A device according to claim 2 , further comprising a device for limiting a speed of the cowls at a beginning of the opening of the cowl.
11. A device according to claim 3 , further comprising a device for limiting a speed of the cowls at a beginning of the opening of the cowl.
12. A device according to claim 4 , further comprising a device for limiting a speed of the cowls at a beginning of the opening of the cowl.
13. A device according to claim 9 , further comprising a device for limiting a speed of the cowls at a beginning of the opening of the cowl.