An actuator assembly configured to control the movement of a stabilizer includes a ball screw having a longitudinal axis and configured to be rotated by a drive assembly, a primary nut assembly coupled to the stabilizer and received on the ball screw such that rotation of the ball screw causes movem
An actuator assembly configured to control the movement of a stabilizer includes a ball screw having a longitudinal axis and configured to be rotated by a drive assembly, a primary nut assembly coupled to the stabilizer and received on the ball screw such that rotation of the ball screw causes movement of the primary nut assembly along the longitudinal axis of the ball screw, the ball screw and primary nut defining a primary load path between the between the drive means and the stabilizer, and a secondary nut assembly coupled to the primary nut assembly and configured to engage the ball screw upon failure of the primary load path. The secondary nut assembly comprising a split nut assembly having opposing halves extending about the ball screw, the split nut having at least one outer cam surface along the outer surface of one of the halves; and a secondary nut housing extending about the split nut; wherein upon failure of the primary load path, rotation of the outer cam surface is configured to move the split nut into locking engagement with the ball screw.
대표청구항▼
1. An actuator assembly configured to control the movement of a stabilizer, the actuator assembly comprising: a ball screw having a longitudinal axis and configured to be rotated by a drive assembly;a primary nut assembly coupled to the stabilizer and received on the ball screw such that rotation of
1. An actuator assembly configured to control the movement of a stabilizer, the actuator assembly comprising: a ball screw having a longitudinal axis and configured to be rotated by a drive assembly;a primary nut assembly coupled to the stabilizer and received on the ball screw such that rotation of the ball screw causes movement of the primary nut assembly along the longitudinal axis of the ball screw, the ball screw and the primary nut assembly defining a primary load path between the between the drive assembly and the stabilizer; anda secondary nut assembly coupled to the primary nut assembly and configured to engage the ball screw upon failure of the primary load path; the secondary nut assembly comprising: a split nut assembly having opposing halves extending about the ball screw, the split nut assembly having at least one outer cam surface along an outer surface of each one of the halves; anda secondary nut housing extending about the split nut assembly;wherein upon failure of the primary load path, further rotation of the ball screw causes rotation of the at least one outer cam surface relative to the secondary nut housing, thereby moving the opposing halves of the split nut assembly toward each other and the ball screw, and subsequently moving the split nut assembly into locking engagement with the ball screw. 2. The actuator assembly of claim 1, further comprising at least one first shear member configured to prevent rotation of the split nut assembly relative to the secondary nut housing prior to failure of the primary load path and to shear upon failure of the primary load path, and at least one second shear member configured to prevent relative axial movement between the primary nut assembly and the secondary nut assembly prior to failure of the primary load path and to shear upon failure of the primary load path. 3. The actuator assembly of claim 2, wherein the halves of the split nut assembly each includes an inner engagement surface configured to frictionally engage an outer surface of the ball screw upon failure of the primary load path. 4. The actuator assembly of claim 3, further comprising at least one rolling member provided between the at least one outer cam surface and the secondary nut housing, wherein application of a rotational force to the ball screw via the drive assembly tends to move the split nut assembly into locking engagement with the ball screw. 5. The actuator assembly of claim 4, wherein application of the rotational force to the ball screw tends to move the split nut assembly into locking engagement with the ball screw independent from the direction of rotation of the ball screw. 6. The actuator assembly of claim 5, wherein a locking force between the split nut assembly and the ball screw increases as the ball screw rotates. 7. The actuator of claim 1, wherein the primary nut assembly is coupled to the secondary nut assembly via a plurality of splines. 8. The actuator assembly of claim 1, wherein a roller is provided between the at least one outer cam surface and the secondary nut housing. 9. The actuator assembly of claim 8, wherein the at least one outer cam surface comprises generally flat surfaces provided on the exterior surface of the split nut halves. 10. The actuator assembly of claim 1, further comprising a plurality of spring members configured to maintain separation between the split nut assembly and the ball screw prior to failure of the primary load path. 11. An actuator assembly comprising: a drive assembly;a ball screw configured to be rotated by the drive assembly,a primary nut assembly configured to engage the ball screw and move along the ball screw when the ball screw rotates, the primary nut assembly providing a primary load path to between the ball screw and a stabilizer; anda secondary nut assembly configured to engage the ball screw upon failure of the primary load path, the secondary nut assembly comprising: a secondary nut housing;a split nut assembly having first and second opposing portions;a plurality of spring members provided between the first and second portions and tending to separate the first and second opposing portions; anda plurality of rollers provided between each of the first and second opposing portions and the secondary nut housing;wherein upon failure of the primary load path, application of a rotational force to the ball screw causes the first and second opposing portions to rotate within the secondary nut housing and toward each other to a locked position. 12. The actuator assembly of claim 11, further comprising a plurality of shear pins that prevent rotation of the split nut relative to the secondary nut housing, wherein the shear pins are configured to shear upon failure of the primary load path and application of a rotational force to the ball screw. 13. The actuator assembly of claim 12, further comprising a second shear pin that prevents axial movement between the primary nut assembly relative to the secondary nut assembly, wherein the second shear pin is configured to shear upon application of an axial load. 14. The actuator assembly of claim 11, wherein the first and second portions each includes a cam surface that engages one of the plurality of rollers. 15. The actuator assembly of claim 14, wherein each of the cam surfaces is a substantially flat surface. 16. The actuator assembly of claim 11, wherein upon failure of the primary load path and application of a rotational force, the split nut rotates within the secondary nut housing to a locked position when the rotational force is in a first rotational direction or when the rotational force is in a second rotational direction opposite the first rotational direction.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (2)
Shaheen, Milad A.; Dreher, Robert V., Actuator for aircraft stabilizers with a failure responsive lock control mechanism.
Antunes, Bruno; Gouard, Christian; Gorecki, Hervé; Mehez, Jérôme; Humanes, Jesus-Angel, Actuator for controlling a horizontal stabilizer of an aircraft.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.