A method and system for imparting a linear motion to a flexible shaft is disclosed. The system includes a bellcrank having a first arm, a second arm, and a first pivot pin therebetween. The system further includes an actuating device coupled to the first arm and configured to apply a force to cause
A method and system for imparting a linear motion to a flexible shaft is disclosed. The system includes a bellcrank having a first arm, a second arm, and a first pivot pin therebetween. The system further includes an actuating device coupled to the first arm and configured to apply a force to cause the bellcrank to rotate about the first pivot pin. Still further, the system includes a second pivot pin coupled to a rod-end of the flexible shaft and further coupled to a slotted hole on the second arm. Yet still further, the system includes a follower surface on the rod-end of the flexible shaft and configured to slide on a cam surface machined on the second arm. Upon application of the force to the first arm, the flexible shaft moves in a substantially linear motion.
대표청구항▼
1. A system for imparting a linear motion to a flexible shaft, the system comprising: a bellcrank having a first arm, a second arm, and a first pivot pin therebetween;an actuating device coupled to the first arm and configured to apply a force thereto to cause the bellcrank to rotate about the first
1. A system for imparting a linear motion to a flexible shaft, the system comprising: a bellcrank having a first arm, a second arm, and a first pivot pin therebetween;an actuating device coupled to the first arm and configured to apply a force thereto to cause the bellcrank to rotate about the first pivot pin;a second pivot pin coupled to a rod-end of the flexible shaft and further coupled to a slotted hole on the second arm;a follower surface on the rod-end of the flexible shaft and configured to slide on a cam surface machined on the second arm; andwherein upon application of the force to the first arm, the flexible shaft moves in a substantially linear motion such that a path of the flexible shaft follows a linear path and does not deviate from the linear path more than a threshold amount, wherein the threshold amount is between +/−0.001 and 0.010 inches. 2. The system of claim 1, wherein a shape of the follower surface and a shape of the cam surface are selected based at least in part on (i) a degree of rotation imparted on the bellcrank by the actuating device and (ii) a length of the first arm and a length of the second arm. 3. The system of claim 1, wherein, when the follower surface slides on the cam surface, an interaction of the follower surface on the cam surface produces a cam reaction that counters a reaction of the second pivot pin, such that the second pivot pin moves in the substantially linear motion. 4. The system of claim 1, wherein the slotted hole has (i) a width that substantially corresponds to a diameter of the second pivot pin and (ii) a length that is greater than the diameter of the second pivot pin. 5. The system of claim 4, wherein the slotted hole moves laterally relative to the second pivot pin when the flexible shaft moves in the substantially linear motion. 6. The system of claim 1, wherein the follower surface comprises a first curved shape, and wherein the cam surface comprises a second curved shape different from the first curved shape. 7. The system of claim 1, further comprising a second follower surface on the rod-end of the flexible shaft and configured to slide on a second cam surface machined on the second arm. 8. The system of claim 1, wherein the flexible shaft is a flexible shaft of a variable area fan nozzle (VAFN). 9. The system of claim 8, wherein the bellcrank is configured to rotate at least between 0 and 10 degrees about the first pivot pin. 10. The system of claim 1, wherein the flexible shaft comprises a metal or fiber-reinforced plastic material. 11. A system for imparting a linear motion to a flexible shaft, the system comprising: a bellcrank having a first arm, a second arm, and a first pivot pin therebetween;an actuating device coupled to the first arm and configured to apply a force thereto to cause the bellcrank to rotate about the first pivot pin;a second pivot pin coupled to a rod-end of the flexible shaft and further coupled to a slotted hole on the second arm;a first follower surface on the rod-end of the flexible shaft and configured to slide on a first cam surface machined on the second arm;a second follower surface on the rod-end of the flexible shaft and configured to slide on a second cam surface machined on the second arm, wherein the second follower surface is located on an opposite side of the rod-end of the flexible shaft as the first follower surface; andwherein upon application of the force to the first arm, the flexible shaft moves in a substantially linear motion such that a path of the flexible shaft follows a linear path and does not deviate from the linear path more than a threshold amount, wherein the threshold amount is between +/−0.001 and 0.010 inches. 12. The system of claim 11, wherein a shape of the first follower surface, a shape of the first cam surface, a shape of the second follower surface, and a shape of the second cam surface are selected based at least in part on (i) a degree of rotation imparted on the bellcrank by the actuating device and (ii) a length of the first arm and a length of the second arm. 13. The system of claim 12, wherein the bellcrank is configured to rotate at least between 0 and 10 degrees about the first pivot pin. 14. A method comprising: manufacturing the system of claim 1, wherein manufacturing the system of claim 1 comprises: selecting (i) a shape of the cam surface and (ii) a shape of the follower surface, wherein the shape of the follower surface and the shape of the cam surface are selected such that upon application of the force to the first arm, the flexible shaft will move in the substantially linear motion such that the path of the flexible shaft follows the linear path and does not deviate from the linear path more than the threshold amount, wherein the threshold amount is between +/−0.001 and 0.010 inches;machining the cam surface on the second arm of the bellcrank; andmachining the follower surface on the rod-end of the flexible shaft. 15. The method of claim 14, wherein the shape of the cam surface and the shape of the follower surface are determined based at least in part on (a) a degree of rotation to be imparted on the bellcrank by the actuating device and (b) a length of the first arm and the second arm. 16. The method of claim 14, further comprising providing the first pivot pin in a pivot between the first arm and the second arm. 17. The method of claim 16, further comprising: providing the slotted hole on the second arm; andcoupling the second pivot pin to the rod-end of the flexible shaft and to the slotted hole. 18. The method of claim 14, further comprising: selecting (i) a shape of a second cam surface for the second arm of the bellcrank and (ii) a shape of a second follower surface for the rod-end of the flexible shaft;machining the second follower surface on the rod-end of the flexible shaft; andmachining the second cam surface on the second arm. 19. The method of claim 14, wherein the flexible shaft is a flexible shaft of a variable area fan nozzle (VAFN).
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (4)
McHugh Donald P. (Wyoming Goshen OH) Cook Donald F. (Goshen OH), Actuation system for a gas turbine engine exhaust device.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.