Shaft assembly and aircraft engine with a shaft assembly

Patent metadata

Field	Value
Publication number	US-2019277342-A1
Application number	US-201916291565-A
Country	US
Kind code	A1
Filing date	Mar 4, 2019
Priority date	Mar 7, 2018
Publication date	Sep 12, 2019
Grant date	—

Abstract

A shaft arrangement with two concentrically arranged shafts, in particular two concentric hollow shafts that are coupled to the drive side or the output side of an engine, wherein the shafts respectively have envelope elements that are connected to at least one elastically bending connection element, wherein the torque transmission between the concentric shafts is effected by tensile forces in the elastically bending envelope elements. The invention also relates to an aircraft engine with such a shaft arrangement.

First claim

1 . A shaft arrangement with two concentrically arranged shafts, in particular two concentric hollow shafts that are coupled to the drive side or output side of an engine, wherein the shafts respectively have envelope elements that are connected with at least one elastically bending connection element, wherein the torque transmission between the concentric shafts is effected by tensile forces in the elastically bending envelope elements.

2 . The shaft arrangement according to claim 1 , wherein the at least one elastically bending connection element is formed as a rope, in particular a wire rope, as a chain or as a strap.

3 . The shaft arrangement according to claim 1 , wherein the at least one elastically bending connection element is formed in a ring-shaped, that is, infinite manner.

4 . The shaft arrangement according to claim 1 , wherein the at least one elastically bending connection element is guided around and/or wound around the envelope elements for connecting the shafts.

5 . The shaft arrangement according to claim 1 , wherein the at least one elastically bending connection element is arranged around the envelope elements without being crossed with itself or with other elastically bending connection elements.

6 . The shaft arrangement according to claim 1 , wherein, for connecting the concentric shafts, the at least one elastically bending connection element, in particular in the loaded state, is arranged in a plane that is located perpendicular to the rotational axis of the two concentric shafts.

7 . The shaft arrangement according to claim 1 , wherein the at least one connection element is affixed at an envelope element at maximally one position.

8 . The shaft arrangement according to claim 1 , wherein the envelope elements are arranged at the concentric shafts in such a manner that the at least one elastically bending connection element connected thereto is arranged in a plane that is perpendicular to the rotational axis of the two concentric shafts.

9 . The shaft arrangement according to claim 1 , wherein the envelope elements are arranged as projections at least at one of the concentric shafts in the axial direction, wherein the projections are in particular formed in one piece at the shaft ends.

10 . The shaft arrangement according to claim 1 , wherein the envelope elements of the at least one concentric shaft are formed at least partially by openings, in particular by pairs of openings, in particular by openings in concentric hollow shafts.

11 . The shaft arrangement according to claim 1 , wherein the at least one elastically bending connection element is formed as a mechanical securing device against overloading in order to protect the gear against blocking.

12 . The shaft arrangement according to claim 1 , wherein at least two elastically bending connection elements are arranged so as to be axially offset with respect to one another, wherein the at least two elastically bending connection elements in particular have different tensile strains.

13 . The shaft arrangement according to claim 1 , wherein between 5 and 30 envelope elements, in particular 10 envelope elements, are arranged at the concentric shafts at the circumference or at the shaft end.

14 . The shaft arrangement according to claim 1 , wherein the shaft arrangement mechanically connects two concentric shafts on the output side of an engine, in particular of a planetary gear, of a turbofan drive.

15 . The shaft arrangement according to claim 1 , wherein the shaft arrangement mechanically connects two concentric shafts on the drive side of an engine, in particular of a planetary gear, of a turbofan drive.

16 . The shaft arrangement according to claim 1 , wherein the envelope elements have a means for axially affixing the at least one elastically bending connection element.

17 . The shaft arrangement according to claim 1 , wherein the at least one elastically bending connection element and/or the envelope elements have a low-friction coating.

18 . The shaft arrangement according to claim 1 , wherein the envelope elements have at least one slide bearing.

19 . The shaft arrangement according to claim 1 , wherein the at least one elastically bending connecting means is formed as a wire rope, wherein the wire rope has a diameter of between 5 and 25 mm, in particular of between 10 and 20 mm.

20 . An aircraft engine with
a core engine, comprising a turbine, a compressor and a core engine shaft for connecting the turbine to the compressor, a fan upstream of the core engine, wherein the fan has a plurality of blades, and a planetary gear that is connected to the core engine shaft on the entry side, and is connected to the fan on the exit side to the drive in such a manner that the rotational speed of the fan is lower than the rotational speed of the core engine shaft, and with a shaft arrangement having the features of claim 1 .

Assignees

• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• Petersen Bjoern

Classifications

• F16D9/04

  by tensile breaking · CPC title

• F16D3/52 Primary

  comprising a continuous strip, spring, or the like engaging the coupling parts at a number of places · CPC title

• F16D3/10

  Couplings with means for varying the angular relationship of two coaxial shafts during motion · CPC title

• F16D3/54 Primary

  Couplings comprising a chain or strip surrounding two wheels arranged side by side and provided with teeth or the equivalent · CPC title

• F16D49/02

  shaped as a helical band or coil with more than one turn, with or without intensification of the braking force by the tension of the band or contracting member (similar clutches F16D13/08) · CPC title