Clutch to disconnect loads during turbine start-up
First Claim
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1. A starting system for an aircraft auxiliary power unit having a turbine used for producing auxiliary power in an aircraft comprising:
- a starter motor system rated only to drive a load of starting equipment used during starting of the turbine and not to drive power producing equipment used only after starting is completed during operation of the auxiliary power unit in producing the auxiliary power;
a gearbox mechanically connecting the starter motor to the turbine and to the starting equipment used during starting the turbine with power being connected from the starter motor to the starting equipment and to the turbine on a non-interruptible basis during starting of the auxiliary power unit;
a clutch having an input connected by the gearbox to an output of the turbine and a clutch output which is driven only during engagement of the input with the output of the clutch with the clutch being disengaged during starting of the auxiliary power unit and engaged during operation of the auxiliary power unit in producing auxiliary power; and
whereinthe power producing equipment is driven from the output of the clutch by the gearbox and produces the auxiliary power during operation of the auxiliary power unit and is not driven from the output of the clutch during starting of the auxiliary power unit.
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Abstract
An aircraft auxiliary power system using a turbine to provide rotational power to a gearbox having coupled to it electric generators and pumps. Between the gearbox and turbine a clutch is provided. The clutch is disengaged when the turbine is started, thus reducing drag on the turbine shaft during starting, and the clutch is engaged after the turbine is started to provide rotational power to the coupled electric generators and pumps.
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Citations
26 Claims
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1. A starting system for an aircraft auxiliary power unit having a turbine used for producing auxiliary power in an aircraft comprising:
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a starter motor system rated only to drive a load of starting equipment used during starting of the turbine and not to drive power producing equipment used only after starting is completed during operation of the auxiliary power unit in producing the auxiliary power; a gearbox mechanically connecting the starter motor to the turbine and to the starting equipment used during starting the turbine with power being connected from the starter motor to the starting equipment and to the turbine on a non-interruptible basis during starting of the auxiliary power unit; a clutch having an input connected by the gearbox to an output of the turbine and a clutch output which is driven only during engagement of the input with the output of the clutch with the clutch being disengaged during starting of the auxiliary power unit and engaged during operation of the auxiliary power unit in producing auxiliary power; and
whereinthe power producing equipment is driven from the output of the clutch by the gearbox and produces the auxiliary power during operation of the auxiliary power unit and is not driven from the output of the clutch during starting of the auxiliary power unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification