An electromechanical actuator (“EMA”) is provided with redundant load paths for driving the actuator stroke. The EMA includes a rotatable screw, a nut mated with the screw and having an external toothed surface, and a rotatable spline member having a splined surface engaging the external toothed sur
An electromechanical actuator (“EMA”) is provided with redundant load paths for driving the actuator stroke. The EMA includes a rotatable screw, a nut mated with the screw and having an external toothed surface, and a rotatable spline member having a splined surface engaging the external toothed surface of the nut. An actuator rod is coupled to the nut for linear movement with the nut. A first motor is operable to rotate the screw relative to the nut to cause the nut to travel linearly along the screw, and a second motor is operable to rotate the spline member and nut such that the nut travels linearly along the screw. Consequently, the actuator rod moves linearly by operation of the first motor alone, by operation of the second motor alone, and by simultaneous operation of the first and second motors. A no-back device may be incorporated into each load path.
대표청구항▼
1. An electromechanical actuator comprising: a screw rotatable about a screw axis;a nut mounted on the screw, the nut having an external toothed surface;a spline member rotatable about a spline member axis, the spline member including a splined surface engaging the external toothed surface of the nu
1. An electromechanical actuator comprising: a screw rotatable about a screw axis;a nut mounted on the screw, the nut having an external toothed surface;a spline member rotatable about a spline member axis, the spline member including a splined surface engaging the external toothed surface of the nut;an actuator rod coupled to the nut for linear movement with the nut;a first motor connected to the screw, the first motor being operable to rotate the screw about the screw axis relative to the nut to cause the nut to travel linearly along the screw relative to the spline member;a second motor connected to the spline member, the second motor being operable to rotate the spline member about the spline member axis to cause the nut to rotate about the screw axis relative to the screw such that the nut travels linearly along the screw relative to the spline member; anda first no-back mechanism, wherein the first motor is connected to the screw by way of the first no-back mechanism;wherein the actuator rod moves linearly by operation of the first motor alone, by operation of the second motor alone, and by simultaneous operation of the first motor and the second motor. 2. The electromechanical actuator according to claim 1, wherein the first motor is operable to rotate the screw in a first rotational direction and the second motor is operable to rotate the nut in a second rotational direction opposite the first rotational direction, whereby the angular speed of the screw relative to the nut is the sum of the angular speed of the screw and the angular speed of the nut. 3. The electromechanical actuator according to claim 1, further comprising a second no-back mechanism, wherein the second motor is connected to the spline member by way of the second no-back mechanism. 4. The electromechanical actuator according to claim 1, wherein the spline member is arranged coaxially about the nut and the splined surface is an internal splined surface. 5. An electromechanical actuator comprising: a screw rotatable about an axis, the screw including a first portion having a left-handed thread and a second portion having a right-handed thread;a first nut mounted on the first portion of the screw and a second nut mounted on the second portion of the screw, each of the first and second nuts having an external toothed surface;a first spline member rotatable about the axis, the first spline member being arranged about the first nut and including an internal splined surface engaging the external toothed surface of the first nut;a second spline member rotatable about the axis, the second spline member being arranged about the second nut and including an internal splined surface engaging the external toothed surface of the second nut;a first actuator rod coupled to the first nut for linear movement with the first nut, and a second actuator rod coupled to the second nut for linear movement with the second nut;a first motor connected to the screw, the first motor being operable to rotate the screw about the axis relative to the first nut and the second nut to cause the first and second nuts to travel linearly along the first and second portions of the screw, respectively;a second motor connected to the first spline member, the second motor being operable to rotate the first spline member and the first nut about the axis relative to the screw to cause the first nut to travel linearly along the first portion of the screw; anda third motor connected to the second spline member, the third motor being operable to rotate the second spline member and the second nut about the axis relative to the screw to cause the second nut to travel linearly along the second portion of the screw;wherein the first actuator rod moves linearly by operation of the first motor alone, by operation of the second motor alone, and by simultaneous operation of the first motor and the second motor; andwherein the second actuator rod moves linearly by operation of the first motor alone, by operation of the third motor alone, and by simultaneous operation of the first motor and the third motor. 6. The electromechanical actuator according to claim 5, wherein the first motor is operable to rotate the screw in a first rotational direction;the second motor is operable to rotate the first spline member and the first nut in a second rotational direction opposite the first rotational direction, whereby the angular speed of the screw relative to the first nut is the sum of the angular speed of the screw and the angular speed of the first nut; andthe third motor is operable to rotate the second spline member and the second nut in the second rotational direction, whereby the angular speed of the screw relative to the second nut is the sum of the angular speed of the screw and the angular speed of the second nut.
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이 특허에 인용된 특허 (18)
David J. Manzanares ; Scott A. Lee, Ball screw actuator locking mechanism.
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