An electromechanical actuator (EMA) is provided. The EMA may comprise a ball nut having an annular geometry centered about an axis. A dual ball screw may be disposed radially inward from the ball nut and configured to rotate about the axis. The dual ball screw may also be mechanically coupled to the
An electromechanical actuator (EMA) is provided. The EMA may comprise a ball nut having an annular geometry centered about an axis. A dual ball screw may be disposed radially inward from the ball nut and configured to rotate about the axis. The dual ball screw may also be mechanically coupled to the ball nut. A ball screw may be disposed radially inward from the ball nut and configured to rotate about the axis. The ball screw may also be mechanically coupled to the dual ball screw.
대표청구항▼
1. An electromechanical actuator (EMA), comprising: a ball nut having an annular geometry centered about an axis;a dual ball screw disposed radially inward from the ball nut and configured to rotate about the axis in a first direction, the dual ball screw mechanically coupled to the ball nut;a ball
1. An electromechanical actuator (EMA), comprising: a ball nut having an annular geometry centered about an axis;a dual ball screw disposed radially inward from the ball nut and configured to rotate about the axis in a first direction, the dual ball screw mechanically coupled to the ball nut;a ball screw disposed radially inward from the ball nut, wherein the ball screw rotates about the axis in the first direction, and is mechanically coupled to the dual ball screw; anda puck coupled to the ball screw, wherein the ball screw ceases rotation in response to the puck contacting a mechanical load member, and wherein the dual ball screw continues rotation in the first direction and translates towards the puck in response to the ball screw ceasing to rotate in the first direction,further comprising a spring coupled to the ball screw configured to position the ball screw relative to the ball nut and configured to apply force to a brake stack through the puck. 2. The EMA of claim 1, wherein the ball nut has a first lead constant and the ball screw has a second lead constant less than the first lead constant. 3. The EMA of claim 1, wherein an effective lead constant of the EMA is equal to a difference between the first lead constant and the second lead constant in response to the ball screw ceasing to rotate. 4. The EMA of claim 3, wherein the second lead constant is within 5% of the first lead constant. 5. The EMA of claim 3, further comprising: a rotor comprising a magnet configured to rotate about the axis; anda stator electromagnetically coupled to the magnet, the rotor configured to move axially relative to the stator. 6. The EMA of claim 1, wherein the dual ball screw comprises a threaded outer diameter and a threaded inner diameter. 7. A brake system, comprising: a brake stack;an electromechanical actuator (EMA) configured to apply force to the brake stack through a puck, wherein the EMA comprises: a rotor configured to rotate about an axis;a dual ball screw mechanically coupled to the rotor and comprising an annular geometry, the dual ball screw comprising a threaded outer diameter and a threaded inner diameter;a ball nut disposed radially outward from the dual ball screw, the ball nut comprising a first threaded surface mechanically coupled to the threaded outer diameter of the dual ball screw;an inner ball screw disposed radially inward from the dual ball screw, the inner ball screw comprising a second threaded surface mechanically coupled to the threaded inner diameter of the dual ball screw, wherein the dual ball screw is configured to continue rotation in response to the inner ball screw ceasing rotation; anda spring coupled to the inner ball screw and configured to position the inner ball screw relative to the ball nut. 8. The brake system of claim 7, wherein the ball nut has a first lead constant and the inner ball screw has a second lead constant less than the first lead constant. 9. The brake system of claim 8, wherein the inner ball screw is configured to stop rotating in response to the puck contacting the brake stack. 10. The brake system of claim 9, wherein an effective lead constant of the EMA is equal to a difference between the first lead constant and the second lead constant in response to the inner ball screw ceasing to rotate. 11. The brake system of claim 10, wherein the second lead constant is within 5% of the first lead constant. 12. The brake system of claim 10, further comprising: a magnet coupled to the rotor; anda stator electromagnetically coupled to the magnet with the magnet configured to move axially relative to the stator. 13. The brake system of claim 7, further comprising a housing encasing the inner ball screw, the dual ball screw, and the ball nut with the ball nut fixedly coupled to the housing. 14. An actuation device, comprising: a first threaded member having an annular geometry and fixed about an axis;a second threaded member disposed radially inward from the first threaded member, wherein the second threaded member rotates about the axis, and is mechanically coupled to the first threaded member; anda third threaded member disposed inward from the second threaded member, wherein the third threaded member rotates about the axis in a first direction, and is mechanically coupled to the second threaded member, wherein the second threaded member continues rotation in the first direction in response to toe third threaded member screw ceasing rotation the first direction,further comprising a spring coupled to the third threaded member and configured to position the third threaded member relative to the first threaded member and configured to apply force to a brake stack through a puck coupled to the third threaded member. 15. The actuation device of claim 14, wherein the first threaded member has a first lead constant and the third threaded member has a second lead constant less than the first lead constant. 16. The actuation device of claim 15, wherein the third threaded member is configured to stop rotating in response to contacting a mechanical load member. 17. The actuation device of claim 15, wherein an effective lead constant of the actuation device is equal to a difference between the first lead constant and the second lead constant.
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이 특허에 인용된 특허 (13)
Brundrett Robert L. ; Mascarella Stephen A. ; Corio Lawrence F. ; Christ Franklin C., Aircraft brake and method with electromechanical actuator modules.
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