Abstract: A jet engine (1) includes at least one emergency drive unit (10), with the jet engine (1) having at least one engine shaft (2a) coupled via at least one gear train (4) with at least one auxiliary gearbox (7), which is connected to at least one auxiliary equipment (8), especially an electric generator. The emergency drive unit (10) includes at least one rotatable component. In order to provide a jet engine with an emergency drive unit in a simple configuration, the rotatable component of the emergency drive unit (10) is attached to the gear train (4).

Abstract: A turbofan engine (1) includes at least one apparatus (30) for driving at least one generator (22, 35), with the engine including a pre-compressor (4), at least one compressor (10) and at least two engine shafts (13, 15) rotatably arranged in an engine casing. At least one first generator (22) is coupled via an auxiliary gearbox (21) with one of the engine shafts (13) and is electrically connected to at least one accessory (23). In order to generate electrical power to such an amount in a turbofan engine (1) that stable operation of the accessories (23), in particular the compressors, is maintained also in the low-energy range, the apparatus (30) includes at least one auxiliary turbine (31) arranged between the pre-compressor (4) and the compressor (10).

Abstract: A jet engine (1) includes at least one emergency drive unit (10), with the jet engine (1) having at least one engine shaft (2a) coupled via at least one gear train (4) with at least one auxiliary gearbox (7), which is connected to at least one auxiliary equipment (8), especially an electric generator. The emergency drive unit (10) includes at least one rotatable component. In order to provide a jet engine with an emergency drive unit in a simple configuration, the rotatable component of the emergency drive unit (10) is attached to the gear train (4).

Abstract: An electronic safety system for the detection of a shaft failure and for the interruption of the energy supply to the shaft includes at least one measuring light guide (13) which is firmly routed in the shaft longitudinal direction, co-rotates with the shaft (1) and is connected to a light source (18) on a light inlet side (14). In the event of a shaft failure, the measuring light guide will break to diminish light transmission therethrough, with the absence of light on a light outlet side (15) being detected by an optical sensor (19) and being used, via evaluation and control electronics (20, 21), as a signal for the shut-off of the further energy supply at a fuel shut-off valve (22). The measuring light guide is fixed to a measuring sleeve (4) attached at both ends to the shaft.

Abstract: A hydraulic seal arrangement 5 between two shafts 1, 2 rotating relatively to each other, particularly in the same sense of rotation, of especially a gas turbine engine, where the radially outer shaft 2 has an annulus 5a extending radially outwards on its circumference into which the radially inner shaft 1 projects with a fin 5b that extends radially outwards on its circumference, said annulus 5a can be filled siphon-fashion through an inlet area 5d under centrifugal effect with a hydraulic fluid in the area of the free end of the fin 5b as the shaft(s) 1, 2 rotate(s), with an opening 7 branching off from an annulus area 5e for the discharge of hydraulic fluid, the annulus 5a being formed by a first outer shell part 8 and a second outer shell part 9 situated on the shaft 2.

Abstract: An electronic safety system for the detection of a shaft failure and for the interruption of the energy supply to the shaft includes at least one measuring light guide (13) which is firmly routed in the shaft longitudinal direction, co-rotates with the shaft (1) and is connected to a light source (18) on a light inlet side (14). In the event of a shaft failure, the measuring light guide will break to diminish light transmission therethrough, with the absence of light on a light outlet side (15) being detected by an optical sensor (19) and being used, via evaluation and control electronics (20, 21), as a signal for the shut-off of the further energy supply at a fuel shut-off valve (22). The measuring light guide is fixed to a measuring sleeve (4) attached at both ends to the shaft.

Abstract: A hydraulic seal arrangement 5 between two shafts 1, 2 rotating relatively to each other, particularly in the same sense of rotation, of especially a gas turbine engine, where the radially outer shaft 2 has an annulus 5a extending radially outwards on its circumference into which the radially inner shaft 1 projects with a fin 5b that extends radially outwards on its circumference, said annulus 5a can be filled siphon-fashion through an inlet area 5d under centrifugal effect with a hydraulic fluid in the area of the free end of the fin 5b as the shaft(s) 1, 2 rotate(s), with an opening 7 branching off from an annulus area 5e for the discharge of hydraulic fluid, the annulus 5a being formed by a first outer shell part 8 and a second outer shell part 9 situated on the shaft 2.