Gas turbine engine comprising a starter engaged with a low-pressure body
A multi-body gas turbine engine, especially an aircraft engine, comprising at least one low-pressure rotating body, a high-pressure rotating body, and a starter designed to rotate the high-pressure body in order to start the engine, wherein the starter is coupled to the low-pressure body and the engine comprises a first disengageable coupling device disposed between the low-pressure body and the high-pressure body, for rotatably connecting the high-pressure body to the low-pressure body so as to allow the starting of the engine by means of the starter.
1. A multi-spool gas turbine engine comprising:
at least one rotating low-pressure body;
a rotating high-pressure body;
a starter motor being coupled to the low-pressure body;
a first disengageable coupling device interposed between the low-pressure body and the high-pressure body in order to rotatably connect the high-pressure body to the low-pressure body in order allow start up of the engine by the starter motor, wherein the first disengageable coupling device is designed so as to be movable between:
a first position, in which the first disengageable coupling device is engaged so that the low-pressure body drives the high-pressure body, and
a second position, in which the first disengageable coupling device is disengaged once a speed of the low-pressure body falls below that of the high-pressure body; and
a gearbox for driving accessory equipment of the engine, the gearbox being coupled to the low-pressure body by a shaft that is arranged substantially radially with respect to the low-pressure body, wherein a second disengageable coupling device is mechanically interposed between the starter motor and said shaft.
2. The turbine engine according to claim 1 , wherein the first disengageable coupling device is a freewheel.
3. The turbine engine according to claim 2 , wherein the low-pressure body comprises a shaft that is mounted coaxially in or on a shaft of the high-pressure body, the first freewheel being mounted between the shafts of the low-pressure and high-pressure bodies.
4. The turbine engine according to claim 2 , wherein the first disengageable coupling device comprises a free wheel having jamming elements.
5. The turbine engine according to claim 4 , wherein the jamming elements of the free wheel are selected from the group consisting of rollers, balls, rolls and jacks.
6. The turbine engine according to claim 1 , wherein the starter motor is a pneumatic starter motor.
7. The turbine engine according to claim 6 , wherein the second disengageable coupling device is a second free wheel which is interposed between said pneumatic starter motor and the gearbox.
8. The turbine engine according to claim 1 , wherein the starter motor is a reversible electrical machine that forms the starter and a generator.