Power drive unit for aircraft cargo handling systems
First Claim
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1. A power drive unit for aircraft cargo handling systems comprising:
- an electric motor responsive to application of electrical power for rotating a motor output shaft,a drive roller mounted for rotation about an axis parallel to said motor output shaft and carried for engagement with cargo to be driven by said unit,gear means coupling said motor output shaft to said drive roller for rotating said drive roller responsive to application of electrical power to said motor, andscrub sensing means for modulating application of electrical power to said motor when said drive roller is scrubbing against cargo engaged by said scrub sensing means.
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Abstract
A power drive unit for aircraft cargo handling systems that includes an electric motor and a drive roller mounted on for rotation about an axis parallel to the motor output shaft for engagement with cargo to be driven by the unit. A planetary gear differential and a torque control arrangement couple the motor output shaft to a self-erecting mechanism for lifting the unit into engagement with cargo, and to the drive roller for propelling the cargo. A scrub sensor is coupled to the drive roller for modulating application of electrical power to the motor when the drive roller is scrubbing against cargo engaged by the roller.
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Citations
21 Claims
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1. A power drive unit for aircraft cargo handling systems comprising:
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an electric motor responsive to application of electrical power for rotating a motor output shaft, a drive roller mounted for rotation about an axis parallel to said motor output shaft and carried for engagement with cargo to be driven by said unit, gear means coupling said motor output shaft to said drive roller for rotating said drive roller responsive to application of electrical power to said motor, and scrub sensing means for modulating application of electrical power to said motor when said drive roller is scrubbing against cargo engaged by said scrub sensing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A self-erecting power drive unit for aircraft cargo handling systems comprising:
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an electric motor responsive to application of electrical power for rotating a motor output shaft, a drive roller mounted for rotation about an axis parallel to said motor output shaft and carried for engagement with cargo to be driven by said unit, means for erecting said unit from a retracted position to an erected position in which said drive roller is positioned to engage cargo, a power-splitting planetary gear differential having an input coupled to said motor output shaft, a first output coupled to said erecting means and a second output coupled to said drive roller, and torque control means coupled to said differential for first coupling drive torque from said motor to said erecting means and then coupling drive torque from said motor to said drive roller when said unit is erect, said torque control means comprising first magnetic means rotatably coupled to said differential between said input and said second output and second magnetic means disposed in fixed position adjacent to said first magnetic means, magnetic forces between said first and second magnetic means inhibiting rotation of said first magnetic means until overcome by torque applied to said first magnetic means after said unit is erect. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification