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With a two-shaft engine, the accessory drive gearbox (5) for the operation of a generator and other auxiliaries (6) is connected to the high-pressure shaft (1) via a high-pressure shaft gearbox (3), which is coupled to a low-pressure shaft gearbox (8) connecting to the low-pressure shaft (7), via an

With a two-shaft engine, the accessory drive gearbox (5) for the operation of a generator and other auxiliaries (6) is connected to the high-pressure shaft (1) via a high-pressure shaft gearbox (3), which is coupled to a low-pressure shaft gearbox (8) connecting to the low-pressure shaft (7), via an overrunning clutch (11), a conical-pulley variable transmission (10) settable on the basis of the shaft speed on both sides, and a first switchable clutch (9). Under certain operating conditions with low speed of the high-pressure shaft or in case of engine failure, the power of the low-pressure shaft, with the clutch (9) engaged, is transferred to the high-pressure shaft gearbox and hence to the accessory drive gearbox via the conical-pulley variable transmission, which compensates for shaft speed difference, and the overrunning clutch, in order to reliably further operate the generator and other accessories with low fuel consumption or by windmilling only.

대표청구항 ▼

What is claimed is: 1. An arrangement for power take-off on a two-shaft engine having a low-pressure shaft and a high-pressure shaft connected to a generator via an accessory drive gearbox, comprising: a high-pressure shaft gearbox arranged between the high-pressure shaft and the accessory drive ge

What is claimed is: 1. An arrangement for power take-off on a two-shaft engine having a low-pressure shaft and a high-pressure shaft connected to a generator via an accessory drive gearbox, comprising: a high-pressure shaft gearbox arranged between the high-pressure shaft and the accessory drive gearbox; and a low-pressure shaft gearbox coupled to the low-pressure shaft; a first switchable clutch connecting the low-pressure shaft gearbox to the high-pressure shaft gearbox for power transmission from the low-pressure shaft gearbox to the high-pressure shaft gearbox, the clutch being actuatable under certain operating conditions, when a speed of the high-pressure shaft is reduced, a conical-pulley variable transmission connecting the low-pressure and high-pressure shaft gearboxes for speed adaptation and setting power transmission between the high-pressure and low-pressure shaft gearboxes; and an overrunning clutch connected between the low-pressure and high-pressure shaft gearboxes to allow energy transmission from the low-pressure shaft to the high-pressure shaft and prevent energy transmission from the high-pressure shaft to the low-pressure shaft. 2. An arrangement in accordance with claim 1, wherein the low-pressure shaft gearbox increases an output speed of the low-pressure shaft, with maximum power transfer, to run within a working range of the conical pulley variable transmission, and the high-pressure shaft gearbox reduces an output speed of the low-pressure shaft, to run within a working range of the conical-pulley variable transmission. 3. An arrangement in accordance with claim 2, wherein the conical-pulley variable transmission comprises two conical pulley pairs connected by a wrapping medium, with a distance between the two conical pulleys of at least one pair being adjustable for speed adaptation by at least one actuator, depending on speeds of the high-pressure and the low-pressure shafts, when the first switchable clutch is engaged. 4. An arrangement in accordance with claim 3, and further comprising: a torque sensor connected to an electronic engine control and positioned downstream of the conical-pulley variable transmission, for setting the conical-pulley variable transmission on the basis of a measured torque. 5. An arrangement in accordance with claim 3, wherein the setting of the conical-pulley variable transmission is effected on a basis of speed measurements of the high-pressure shaft and the low-pressure shaft. 6. An arrangement in accordance with claim 3, and further comprising a second switchable clutch positioned between the high-pressure shaft and the high-pressure shaft gearbox, which is disengaged in case of engine failure, and which separates the high-pressure shaft from the high-pressure shaft gearbox if the first switchable clutch is engaged. 7. An arrangement in accordance with claim 1, wherein the conical-pulley variable transmission comprises two conical pulley pairs connected by a wrapping medium, with a distance between the two conical pulleys of at least one pair being adjustable for speed adaptation by at least one actuator, depending on speeds of the high-pressure and the low-pressure shafts, when the first switchable clutch is engaged. 8. An arrangement in accordance with claim 7, and further comprising: a torque sensor connected to an electronic engine control and positioned downstream of the conical-pulley variable transmission, for setting the conical-pulley variable transmission on the basis of a measured torque. 9. An arrangement in accordance with claim 7, wherein the setting of the conical-pulley variable transmission is effected on a basis of speed measurements of the high-pressure shaft and the low-pressure shaft. 10. An arrangement in accordance with claim 7, and further comprising a second switchable clutch positioned between the high-pressure shaft and the high-pressure shaft gearbox, which is disengaged in case of engine failure, and which separates the high-pressure shaft from the high-pressure shaft gearbox if the first switchable clutch is engaged. 11. An arrangement in accordance with claim 1, and further comprising: a torque sensor connected to an electronic engine control and positioned downstream of the conical-pulley variable transmission, for setting the conical-pulley variable transmission on the basis of a measured torque. 12. An arrangement in accordance with claim 1, wherein the setting of the conical-pulley variable transmission is effected on a basis of speed measurements of the high-pressure shaft and the low-pressure shaft. 13. An arrangement in accordance with claim 1, and further comprising a second switchable clutch positioned between the high-pressure shaft and the high-pressure shaft gearbox, which is disengaged in case of engine failure, and which separates the high-pressure shaft from the high-pressure shaft gearbox if the first switchable clutch is engaged.