초록 ▼

An aircraft secondary power system having a selectively operable power source for drive of accessories and for starting of a jet engine. The system includes a clutch which is engaged when the power source is to start the engine. At a predetermined engine speed, the engine takes over the drive of the

An aircraft secondary power system having a selectively operable power source for drive of accessories and for starting of a jet engine. The system includes a clutch which is engaged when the power source is to start the engine. At a predetermined engine speed, the engine takes over the drive of the accessories through the clutch and, at a selected higher speed of the engine, the clutch is disengaged to cause the drive of the accessories from the engine at a lower drive ratio whereby the accessories are driven at a lower speed relative to the speed of the engine.

대표청구항 ▼

1. A combined engine-starter and accessory drive system comprising, a power source with an output shaft, an accessory drive shaft, a series of meshing gears and an overrunning clutch interconnecting said shafts whereby rotation of said output shaft rotates said accessory drive shaft, an engine drive

1. A combined engine-starter and accessory drive system comprising, a power source with an output shaft, an accessory drive shaft, a series of meshing gears and an overrunning clutch interconnecting said shafts whereby rotation of said output shaft rotates said accessory drive shaft, an engine drive shaft, intermeshing gears one of which is connected to said engine drive shaft, a drive connection between the other of said intermeshing gears and one of said series of meshing gears and including a disengageable slip clutch, and another drive connection between the engine drive shaft and said series of meshing gears in parallel drive relation with the first-mentioned drive connection and including an overrunning clutch operable to transmit rotation only from the engine drive shaft to said series of meshing gears. 2. A combined engine-starter and accessory drive system as defined in claim 1 wherein said drive connection between the other of said intermeshing gears and one of said series of meshing gears includes a torque converter for amplifying the torque of the power source. 3. A combined engine-starter and accessory drive system as defined in claim 2 including a drive connection from the engine drive shaft to the input side of the torque converter and including an overrunning clutch to lock up the torque converter when the engine speed attempts to go above the torque converter input speed. 4. A combined engine-starter and accessory drive system comprising, a power source with an output shaft, an accessory drive shaft, a drive train including a series of meshing gears and an overrunning clutch interconnecting said shafts whereby rotation of said output shaft rotates said accessory drive shaft, an engine drive shaft, intermeshing gears one of which is connected to said engine drive shaft, a drive connection between the other of said intermeshing gears and one of said series of meshing gears and including a disengageable clutch and a torque converter for drive of the engine drive shaft from the power source when the disengageable clutch is engaged, and another drive connection between the engine drive shaft and said series of meshing gears in parallel drive relation with the first-mentioned drive connection and including an overrunning clutch operable to transmit rotation only from the engine drive shaft to said series of meshing gears. 5. A combined engine-starter and accessory drive system comprising, a power source with an output shaft, an accessory drive shaft, a drive train including a series of meshing gears and an overrunning clutch interconnecting said shafts whereby rotation of said output shaft rotates said accessory drive shaft, an engine drive shaft, intermeshing gears one of which is connected to said engine drive shaft, a drive connection between the other of said intermeshing gears and one of said series of meshing gears and including a disengageable clutch and a torque converter for drive of the engine drive shaft from the power source when the disengageable clutch is engaged, a second drive connection between the engine drive shaft and said meshing gears through said disengageable clutch and including an overrunning clutch and operable to transmit rotation to the accessory drive shaft, and a further drive connection between the engine drive shaft and said series of meshing gears including an overrunning clutch operable to transmit rotation only from the engine drive shaft to said series of meshing gears when said disengageable clutch is disengaged. 6. A combined engine-starter and accessory drive system comprising: a power source with an output shaft; an accessory drive shaft; a first drive train including gears and an overrunning clutch connecting said output shaft and the accessory drive shaft, an engine having an engine drive shaft; means for transmitting the drive from the output shaft to the engine drive shaft to start the engine including a disengageable slip clutch connected to the first drive train and connected to drive transmission components including a torque converter and an overrunning clutch which transmits a drive from the torque converter to the engine drive shaft; means including an overrunning clutch connecting the engine drive shaft to said first drive train through said slip clutch and to the input side of the torque converter for driving the accessory drive shaft from the engine drive shaft at a certain drive ratio when the engine reaches a predetermined speed; and means including an overrunning clutch connecting the engine drive shaft to said first drive train for driving the accessory drive shaft from the engine drive shaft at a lower drive ratio when the engine reaches a speed higher than said predetermined speed and the slip clutch is disengaged. 7. An aircraft secondary power system providing for engine start and accessory drive comprising, an engine drive shaft, an accessory drive shaft, a power drive shaft connectable to a power source, first gear means interconnecting said power drive shaft and said accessory drive shaft for driving of accessories from said power drive shaft and including an overrunning clutch to prevent a reverse drive to the power drive shaft, second gear means interconnecting said first gear means with the engine drive shaft and including a disengageable slip clutch, third gear means interconnecting said engine drive shaft with the first gear means in parallel drive relation with the second gear means and including an overrunning clutch to transmit a drive only from the engine drive shaft and permit drive of the accessories from the engine drive shaft by the second gear means when the slip clutch is engaged, and said third gear means having a different drive ratio than the second gear means to achieve a lower ratio between the engine drive shaft and the accessory drive shaft when the slip clutch is disengaged.