High lift surface actuation system
First Claim
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1. A drive system for a high-lift device on an aircraft consisting of at least two independent segments comprising:
- a torque tube;
a first power drive unit connected to the first end of said torque tube;
a second power drive unit located remote from said first power drive unit and connected to the second end of said torque tube so as to form an open loop drive driven from both ends and connected so that the force output of said first and second power drive units sum;
means connected between said torque tube and said high-lift device segments for extending and retracting said high-lift device segments as a result of rotation of said torque tube;
at least one power source connected to each of said first and second power drive units;
means to control said power source;
means to measure asymmetry between said at least two independent segments and produce a responsive asymmetrical signal;
means to lock said segments in their current position in the event asymmetry exceeds a pre-determined amount; and
means to lock said segments in their current position in the event there is an interruption of said asymmetrical signal.
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Accused Products
Abstract
A drive system for high-lift devices on aircraft having two power drive units, one at each end of the connecting torque tube system, so as to force sum the outputs. A one-way brake always insures against inadvertent retraction of the device but allows extension. An asymmetrical protective device prevents the high-lift device from an asymmetrical condition even after a combined power loss and mechanical failure of the torque tube. The power drive units consist of hydraulic motors driving through a gear box and a no-back brake combination and are controlled by a servo valve.
111 Citations
12 Claims
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1. A drive system for a high-lift device on an aircraft consisting of at least two independent segments comprising:
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a torque tube; a first power drive unit connected to the first end of said torque tube; a second power drive unit located remote from said first power drive unit and connected to the second end of said torque tube so as to form an open loop drive driven from both ends and connected so that the force output of said first and second power drive units sum; means connected between said torque tube and said high-lift device segments for extending and retracting said high-lift device segments as a result of rotation of said torque tube; at least one power source connected to each of said first and second power drive units; means to control said power source; means to measure asymmetry between said at least two independent segments and produce a responsive asymmetrical signal; means to lock said segments in their current position in the event asymmetry exceeds a pre-determined amount; and means to lock said segments in their current position in the event there is an interruption of said asymmetrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A drive system for a high-lift device on an aircraft consisting of at least two independent segments comprising:
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first and second motors having first and second brakes releasable with the application of power; a first differential gear box which sums both the force and speed of two inputs connected to the output of said first and second motors having first and second brakes to form a first drive unit; third and fourth motors having third and fourth brakes releasable with the application of power; a second differential gear box which sums both force and speed of two inputs located remote from said first differential gearbox and connected to the output of said third and fourth motors having third and fourth brakes to form a second drive unit; a torque tube connected between the outputs of said first and second drive units so as to form an open loop drive, driven from each end; means connected between said torque tube and said high-lift device segments for extending and retracting said high-lift device segments as a result of rotation of said torque tube; at least one power source connected to said first and second drive units; and means to control said power source. - View Dependent Claims (10)
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11. A drive system for a segmented control surface on an aircraft consisting of at least two independent segments comprising:
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a torque tube; first and second power drive units, located remote from each other and connected one at each end of said torque tube so as to form an open loop drive driven from both ends and said first and second power drive units further comprise; a motor having an output shaft and supported on fixed structure; a no-back device, having a rotating member and a fixed member with said rotating member attached to said motor output shaft; a brake attached between said fixed structure and said fixed member of said no-back device with said brake biased to engage and having means to disengage upon application of power to said motor whereby said power drive unit can drive in only one direction with said brake engaged and in both directions with said brake disengaged; means connected between said torque tube and said control surface segments for extending and retracting said control surface segments as a result of rotation of said torque tube; at least one power source connected to said first and second power drive units; means to control said power source; and means to measure asymmetry between said at least two independent segments and produce a responsive asymmetrical signal applied to said means to control said power source so as to apply said brake and stop said motors. - View Dependent Claims (12)
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Specification