AIRCRAFT WITH A JET ENGINE

Abstract

An aircraft with a jet engine that has a radially outer engine cowling and an auxiliary gear appliance that has multiple auxiliary devices and that can be driven by a shaft that is in operative connection with an engine shaft that rotates about a central axis. The auxiliary gear appliance is arranged in the radial direction of the jet engine at least partially outside the outer engine cowling of the jet engine.

Claims

1. An aircraft with a jet engine having a radially outer engine cowling and an auxiliary gear appliance that comprises multiple auxiliary devices and that can be driven by a shaft that is in operative connection with an engine shaft that rotates about a central axis, wherein the auxiliary gear appliance is arranged in the radial direction of the jet engine at least partially outside the outer engine cowling of the jet engine, wherein the auxiliary gear appliance is linked to a frame appliance that is directly connected to an aircraft fuselage and/or an aircraft wing.

2. The aircraft according to claim 1, wherein the frame appliance is arranged at least partially inside an engine pylon that is assigned to the jet engine.

3. The aircraft according to claim 1, wherein the frame appliance has linking elements for the auxiliary devices and conduits, tubes and/or wiring harnesses that are assigned to it.

4. The aircraft according to claim 1, wherein the auxiliary gear appliance is arranged at least partially inside an aircraft fuselage and/or engine pylon and/or aircraft wing.

5. The aircraft according to claim 1, wherein the shaft that drives the auxiliary gear appliance extends through a support strut of the jet engine, with the jet engine being linked to the engine pylon, the aircraft fuselage or the aircraft wing in its area.

6. The aircraft according to claim 1, wherein the jet engine comprises a linking device for linking the jet engine at an element of the aircraft optionally in a first mounting position and at least one second mounting position, and at least one operating equipment appliance which has a first fluid area and comprises a second fluid area, wherein in the first mounting position the first fluid area is assigned to a first functionality and the second fluid area is assigned to a second functionality, and wherein the fluid areas are assigned to the respectively other functionality in the second mounting position.

7. The aircraft according to claim 6, wherein the fluid areas are assigned to re-circulation and venting as functionalities.

8. The aircraft according to claim 6, wherein the fluid areas have conduit areas that are arranged at a distance to each other in the circumferential direction of the jet engine, wherein the conduit areas are arranged so as to be substantially symmetrical to the linking device in the circumferential direction of the jet engine.

9. The aircraft according to claim 6, wherein the linking device has at least two engine attachment points, wherein the linking device is connected to a carrier structure of the jet engine in the area of the engine attachment points.

10. The aircraft according to claim 9, wherein the linking device comprises an interface device to the aircraft preferably at least approximately centrally to the two engine attachment points in the circumferential direction.

11. The aircraft according to claim 1, wherein at least two lifting points embodied for mounting the jet engine are provided in a manner distributed in the circumferential direction of the jet engine, wherein the lifting points are arranged so as to be preferably symmetrical to the interface device in the circumferential direction.

12. The aircraft according to claim 6, wherein the conduit areas are respectively arranged inside a support strut, wherein the support struts extend substantially in the radial direction through a bypass flow channel of the jet engine.

Description

[0032] Further advantages and advantageous embodiments of the aircraft according to the invention follow from the patent claims and from the exemplary embodiment that is described in principle in the following by referring to the drawing.

[0033] Herein:

[0034] FIG. 1 shows a simplified three-dimensional view of an aircraft with jet engines that are arranged in the tail area at an aircraft fuselage;

[0035] FIG. 2 shows a simplified longitudinal section view of a jet engine of the aircraft according to FIG. 1, wherein a linkage of the jet engine to the aircraft fuselage can be seen;

[0036] FIG. 3 shows a strongly schematized cross sectional rendering of a jet engine of FIG. 2 of the aircraft according to FIG. 1 in isolation;

[0037] FIG. 4 shows a further strongly schematized sectional view of a jet engine of the aircraft according to FIG. 1 in isolation;

[0038] FIG. 5 shows a schematic front view of the jet engine according to FIG. 3 and FIG. 4 in a first mounting position installed on a first side of the aircraft; and

[0039] FIG. 6 shows a view of the jet engine according to FIG. 5 in a second mounting position installed on a second side of the aircraft.

[0040] Referring to FIG. 1, what is shown is a passenger aircraft 1 that can be driven by three jet engines 2, 3, 4. The first jet engine 2 is arranged on a left side of the aircraft in the tail area of the aircraft 1 in the area of a vertical stabilizer 6 and is linked to an aircraft fuselage 8 in the area of an engine pylon 7. The second jet engine 3 is connected to the aircraft fuselage 8 in a substantially mirror-symmetrical manner on a right side of the aircraft.

[0041] The third jet engine 4 is positioned at the rear end of aircraft fuselage 8 and attached at an inner fuselage strut that is arranged below the vertical stabilizer 6 of the aircraft 1. For supplying air to the third jet engine 4, an air inlet 10 is provided that is arranged in the flight direction in front of the vertical stabilizer 6 on a top side of the aircraft fuselage 8 and is connected to the third jet engine 4 inside the aircraft fuselage 8.

[0042] In general, a variety of arrangements of jet engines at an aircraft is possible, wherein, in addition to the shown positions, a jet engine can for example also be arranged in the area of an aircraft wing, below or above the same.

[0043] In FIG. 2, the jet engine 2 is shown in a longitudinal section view and formed with a bypass channel 12 and an inflow area 13, wherein a fan 14 connects to the inflow area 13 downstream in a per se known manner. Downstream of the fan 14, the fluid flow is in turn divided inside the jet engine 2 into a bypass flow and a core flow, wherein the bypass flow flows through the bypass flow channel 12 and the core flow flows into an engine core 15 or core flow channel, which is in turn embodied in a per se known manner with a compressor appliance 16, a burner 17 and a turbine appliance 18. In the present case, the turbine appliance 18 has three rotor devices 19, 20 and 21 that are mounted so as to be rotatable about a central axis 22.

[0044] As shown particularly clearly in FIG. 2, in the aircraft 1 with the jet engine 2 an auxiliary gear appliance 23 or auxiliary unit gear appliance is arranged in the radial direction of the jet engine 2 outside of a nacelle installation space 26 forming an outer engine cowling. In the present case, the auxiliary gear appliance 23 can be driven via a drive shaft 24 that extends substantially in the radial direction of the jet engine 2 and that presently is connected to an engine shaft, here a high-pressure shaft 54, of the jet engine 2 rotating about a central axis 22. Thus, the auxiliary gear appliance 23 that comprises different auxiliary units 27, such as for example a starter, a generator, an oil separator or the like, is driven or supplied with a torque by the high-pressure shaft 54 during operation of the jet engine 2.

[0045] As can further be seen from FIG. 2, the auxiliary gear appliance 23 is arranged inside the engine pylon 7, wherein the conduits 29 by means of which the auxiliary units 27 are connected to the jet engine 2 can also be seen.

[0046] Arranged inside the engine pylon 7 is a frame appliance 30, a so-called space frame to which, besides the auxiliary units 27 of the auxiliary gear appliance 23, also conduits, tubes and wiring harnesses can be linked by means of schematically shown linking elements 31. The frame appliance 30 is in particular embodied with a grid structure that can be adjusted depending on the elements to be arranged.

[0047] As can further be seen from FIG. 2, in the present case three connection appliances 33 are provided, by means of which the frame appliance 30 is linked to the aircraft fuselage 8 or optionally to an aircraft wing. In further embodiments, also two or more than three connection appliances can be provided.

[0048] By arranging the auxiliary gear appliance 23 with the auxiliary units 27 substantially outside the nacelle installation space 26, the latter can be reduced to a cross section as shown by the dashed line 26 in contrast to a cross section that is shown by the solid line 26, as it would have to be provided if the auxiliary gear appliance was arranged inside the nacelle installation space 26.

[0049] By arranging the auxiliary gear appliance 23 outside the nacelle installation space 26, a length of the jet engine 2 can also be reduced, so that an aerodynamic resistance of the jet engine 2 and thus also of the aircraft 1 is advantageously low, and the aircraft 1 has an advantageously low fuel consumption. In addition, in this manner the auxiliary gear appliance 23 is subjected to more favorable temperature and vibration conditions, so that the auxiliary gear appliance 23 has a long service life.

[0050] FIG. 3 to FIG. 6 show strongly simplified cross-sectional renderings of the jet engine 2 in the area of the engine pylon 7 with the auxiliary gear appliance 23.

[0051] FIG. 3 shows a schematic rendering of linking device 36 which, in the present case, has two engine attachment points 37, 38 by means of which, in the present case, the linking device 36 is connected to a fan housing 55. Further, the linking device 36 has an interface device 40 by means of which, in the present case, the linking device 36 is connected to the frame appliance 30 and thus to the aircraft fuselage 8. Alternatively, the interface can also be provided at the pylon or directly at the aircraft fuselage.

[0052] As can be seen in FIG. 4, in which the jet engine 2 is shown in a neutral position, i.e. not in installation position, here the interface device 40 as well as the engine attachment points 37, 38 are arranged in the circumferential direction U of the jet engine 2 respectively in the area of a support strut 42, wherein the support struts 42 extend in the radial direction R of the jet engine 2 through the bypass channel 12 and connect the fan housing 55 to an intermediate housing 43. In the present case, ten support struts 42 are provided in a manner evenly distributed in the circumferential direction U. However, the number can also be more or less than that, and can for example vary between 4 and 28 or more.

[0053] The interface device towards the aircraft 1 is arranged in the area of a support strut 42A. The engine attachment points 37 and 38 are provided at the support struts 42B and 42C adjacent on both sides, thus arranged substantially symmetrical to the interface device 40, wherein in the present case an angle between the engine attachment points 37, 38 is 72, as viewed in the circumferential direction U. In addition, in FIG. 4 to FIG. 6, the drive shaft 24 of the auxiliary gear appliance 23, which is not shown here in any more detail, can respectively be seen in the area of the support strut 42A leading to the interface device 40.

[0054] Further, FIG. 4 to FIG. 6 show, in sections, an operating equipment appliance that is embodied as a hydraulic appliance 45, wherein the hydraulic appliance 45 has two fluid areas 46, 47. Here, each of the mirror-inverted fluid areas 46, 47 is designed in such a manner that it can optionally be used for venting (vent) as well as for oil draining and oil recirculation (drain/scavenge). The conduit areas 48, 49 of the fluid areas 46, 47 respectively extend through support struts 42D and 42E from the intermediate housing 43 in the direction of the fan housing 55, with a further conduit area 50, 51 respectively connecting thereto, extending in the circumferential direction U towards the interface device 40 inside the nacelle installation space 26.

[0055] The support struts 42D and 42E that receive the conduit areas 48, 49 are in turn arranged to be symmetrical to the support strut 42A that is assigned to the interface device 40 and thus to the interface device 40, wherein in the present case an angle between the conduit areas 48, 49 is 144, as viewed in the circumferential direction U.

[0056] Further, in the area of further support struts 42F and 42G, lifting points 52, 53 are arranged, which are formed with corresponding attachment means and at which the jet engine 2 can be supported for being mounted at the aircraft 1. Here, the support struts 42F and 42G again extend symmetrically to the interface device 40 and in a mirror-inverted manner to the support struts 42B, 42C of the engine attachment points 37, 38.

[0057] Of course, the distance between the support struts, in which the engine attachment points, the conduits of the fluid areas and lifting points are received, varies with the total number of support struts. Thus, in the embodiment according to FIG. 4, an angle between the lifting points 52, 53, as viewed in the circumferential direction U, is for example 72, whereas the angle in the embodiment according to FIG. 5 and FIG. 6 is 144.

[0058] FIG. 5 and FIG. 6 show the jet engine 2 in a first mounting position and in a differing second mounting position at the aircraft 1, wherein in FIG. 5 the jet engine 2 is shown in a mounting position on the right side of the aircraft, and in FIG. 6 is shown pivoted by 144 in a mounting position on the left side of the aircraft. The fluid area 46 that serves for venting when the jet engine 2 is mounted on the right side according to FIG. 5 becomes an oil return line in case of a mounting on the left side according to FIG. 6, while the fluid area 47 that serves for oil recirculation with a mounting on the right side serves for venting with a mounting on the left side.

[0059] As follows from a comparison of FIG. 4 and FIG. 5, the arrangement of the jet engine 2 on the right side of the aircraft is substantially mirror-inverted to the arrangement of the jet engine 2 on the left side of the aircraft with respect to an aircraft median longitudinal plane, wherein the lifting points 52, 53, the conduit areas 47, 48 and the engine attachment points 37, 38 respectively take a position that is switched with respect to one another, and the functionalities of the fluid areas 46, 47 are switched.

[0060] Thus, it is principally possible to use jet engines of identical design to link these at the aircraft 1 on different sides of the aircraft 1 with differing linking angles.

LIST OF REFERENCE SIGNS

[0061] 1 aircraft [0062] 2, 3, 4 jet engine [0063] 6 vertical stabilizer [0064] 7 engine pylon [0065] 8 aircraft fuselage [0066] 10 air inlet [0067] 12 bypass flow channel [0068] 13 inflow area [0069] 14 fan [0070] 15 engine core flow channel [0071] 16 compressor appliance [0072] 17 burner [0073] 18 turbine appliance [0074] 19, 20, 21 rotor device [0075] 22 central axis [0076] 23 auxiliary gear appliance [0077] 24 drive shaft [0078] 25 bevel gear [0079] 26 nacelle installation space [0080] 27 auxiliary units [0081] 28 engine shaft, low-pressure shaft [0082] 29 conduits [0083] 30 frame appliance [0084] 31 linking elements [0085] 33 connection appliance [0086] 36 linking device [0087] 37, 38 engine attachment point [0088] 40 interface device [0089] 42, 42A to G support strut [0090] 43 intermediate housing [0091] 45 operating equipment appliance; hydraulic appliance [0092] 46, 47 fluid area [0093] 48, 49 conduit area [0094] 50, 51 further conduit area [0095] 52, 53 lifting point [0096] 54 engine shaft, high-pressure shaft [0097] 55 carrier structure, fan housing [0098] R radial direction of the jet engine [0099] U circumferential direction of the jet engine