Arrangement for a rail vehicle

Patent metadata

Field	Value
Publication number	US-11845474-B2
Application number	US-202118013027-A
Country	US
Kind code	B2
Filing date	Aug 6, 2021
Priority date	Aug 12, 2020
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

An arrangement for a rail vehicle has an electric hollow-shaft motor with a hollow rotor and a wheelset shaft that runs through the hollow rotor. The rotor is separated from the wheelset shaft at least in certain sections by a radial air gap which ensures a mechanical clearance between the wheelset shaft and the rotor. A protective material is arranged in the region of the radial air gap between the rotor and the wheelset shaft. The protective material, in the event of failure of a motor fastening of the hollow-shaft motor and subsequent support of the rotor on the wheelset shaft, separates the rotor from the wheelset shaft. The protective material is softer than the material of the wheelset shaft and softer than at least one material of the rotor.

First claim

The invention claimed is:

1. An arrangement for a rail vehicle, comprising:
an electric hollow-shaft motor having a hollow rotor;
a wheelset shaft extending coaxially through said hollow rotor, said rotor being separated from said wheelset shaft at least in part by a radial air gap formed to ensure a mechanical play between said wheelset shaft and said rotor;
protective material disposed in said radial air gap between said rotor and said wheelset shaft and configured, in an event of a failure of a motor fastening of said hollow-shaft motor and a subsequent support of said rotor on said wheelset shaft, to separate said rotor from said wheelset shaft, said protective material being softer than a material of said wheelset shaft and softer than at least one material of the rotor.

2. The arrangement according to claim 1 , wherein said protective material forms at least one protective ring, and
said at least one protective ring is disposed on an interior of said hollow rotor and has a smaller internal diameter than said rotor, wherein said at least one protective ring rests on said wheelset shaft in the event of a failure of the motor fastening; or
said at least one protective ring is disposed on an exterior of said wheelset shaft, has a larger external diameter than said wheelset shaft, and in the event of a failure of the motor fastening supports said rotor.

3. The arrangement according to claim 2 , wherein said at least one protective ring is mounted as a separate part on an interior face of said rotor or on an exterior face of said wheelset shaft or is formed by a coating process.

4. The arrangement according to claim 1 , wherein said protective material forms at least one protective tube, and
said at least one protective tube is disposed on an interior of said hollow rotor and has a smaller internal diameter than said rotor, wherein said at least one protective tube rests on said wheelset shaft in the event of a failure of the motor fastening; or
said at least one protective tube is disposed on an exterior of said wheelset shaft, has a larger external diameter than said wheelset shaft, and in the event of a failure of the motor fastening supports said rotor.

5. The arrangement according to claim 4 , wherein said protective tube is mounted as a separate part on an interior face of said rotor or on an exterior face of said wheelset shaft or is formed by a coating process.

6. The arrangement according to claim 1 , wherein:
said protective material forms at least two protective rings, each being disposed on an interior of said hollow rotor and having a smaller internal diameter than an internal diameter of said rotor, and said at least two protective rings being axially spaced apart from one another; and
one of said at least two protective rings being arranged in a region of one axial end of said rotor and another one of said at least two protective rings being arranged in a region of an opposite axial end of said rotor.

7. The arrangement according to claim 6 , wherein said axially spaced-apart protective rings consist of materials of different hardness.

8. The arrangement according to claim 6 , further comprising a radially interior rotor tube disposed between said axially spaced-apart protective rings and axially fixed by at least one of said protective rings.

9. The arrangement according to claim 1 , wherein said rotor comprises ferrous laminated cores, and said protective material is softer than a material of said ferrous laminated cores.

10. The arrangement according to claim 1 , wherein said protective material is a non-ferrous material.

11. The arrangement according to claim 1 , wherein at least one of the following is true:
said protective material contains, or consists of, at least one of aluminum or copper;
said protective material contains, or consists of, rubber or natural rubber;
said protective material has a maximum elastic limit of 200 N/mm 2 .

12. The arrangement according to claim 1 , wherein:
said hollow-shaft motor is mounted to a chassis or a frame of a vehicle; and
said wheelset shaft is rotatably mounted by way of bearings attached to the chassis or the frame of the vehicle.

13. The arrangement according to claim 1 , further comprising:
a connection device disposed to non-rotatably connect said rotor to said wheelset shaft at one of two rotor ends;
said connection device being at least one of axially or radially movable; and
said connection device enabling at least one of an axial or radial movement between the said rotor end and said wheelset shaft.

14. The arrangement according to claim 13 , wherein:
said protective material forms at least two protective rings that are axially spaced apart from one another; and
said protective ring close to said connection device being softer than said protective ring remote from said connection device.

15. The arrangement according to claim 1 , wherein:
said protective material forms at least two protective rings, each arranged on an exterior of said wheelset shaft, having a larger external diameter than said wheelset shaft and being axially spaced apart from one another; and
one of said protective rings is attached to said wheelset shaft in a region of one axial end of said rotor and another protective ring is attached in a region of another axial end of said rotor.

16. A hollow-shaft motor for a rail vehicle, comprising an arrangement according to claim 1 .

17. A rail vehicle, comprising at least one arrangement according to claim 1 .

18. A rail vehicle, comprising at least one hollow-shaft motor with an arrangement according to claim 1 .

Assignees

• Siemens Mobility GmbH

Inventors

• Adam Christoph
• Seitz Peter

Classifications

• B61C3/00 Primary

  Electric locomotives or railcars (characterised by power transmission B61C9/00; electrical features B60L; H02) · CPC title

• B61C9/44

  with hollow transmission shaft concentric with wheel axis · CPC title