Transmission for the powertrain of a rail vehicle

Patent metadata

Field	Value
Publication number	US-10428903-B2
Application number	US-201515320400-A
Country	US
Kind code	B2
Filing date	Jun 2, 2015
Priority date	Jul 4, 2014
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A transmission for the power-train of a rail vehicle, in which the transmission ( 3 ) includes an input shaft ( 4 ), an intermediate shaft ( 5 ) and a drive output shaft ( 6 ). The input shaft ( 4 ) can be connected so as to be driven by a drive motor ( 2 ), and the drive output shaft ( 6 ) forms a wheelset shaft of the rail vehicle. The transmission ( 3 ) has at least two selectively shiftable transmission stages with different transmission ratios for the same travel direction, and a shifting device ( 7 ) for engaging the transmission stages. Furthermore, a power-train for a rail vehicle having a transmission of such type is proposed.

First claim

The invention claimed is:

1. A wheelset transmission for a power-train of a rail vehicle, the wheelset transmission comprising:
an input shaft,
an intermediate shaft,
a drive output shaft,
the input shaft being connectable so as to be driven by a drive motor,
the wheelset transmission having at least two selectively engagable transmission stages with different transmission ratios for a same travel direction, and a shifting device for selectively engaging the two transmission stages independent of each other,
the two transmission stages being formed of a first spur gear pair, including a first spur gear and a third spur gear, and a second spur gear pair, including a second spur gear and a fourth spur gear,
the first and the second spur gears each being arranged in a rotationally fixed manner on the input shaft whereas the third and the fourth spur gears each being arranged so as to rotate about an intermediate shaft axis, and
the third and the fourth spur gears being mounted to rotate in a housing of the wheelset transmission in each case on a bearing support stud fixed to the housing.

2. The wheelset transmission according to claim 1 , wherein the shifting device comprises a shifting member being mounted rotationally fixed and axially movable relative to the intermediate shaf, the shifting member is axially movable by an actuator of the shifting device such that only one of the third spur gear and the fourth spur gear is selectively connectable to the intermediate shaft in a rotationally fixed manner at a time.

3. The wheelset transmission according to claim 2 , wherein the intermediate shaft is a hollow shaft with an axial bore, and the shifting member is actuatable through the bore.

4. The wheelset transmission according to claim 3 , wherein the actuator is fixed to the housing and is connected to the shifting member via an axially movable shift-rod that passes through the bored.

5. The wheelset transmission according to claim 4 , wherein the actuator is a cylinder-piston unit which has a movable piston that is connected to the shift-rod.

6. The wheelset transmission according to claim 3 , wherein the actuator is solidly connected to the intermediate shaft and is arranged at least partially inside the bore of the intermediate shaft.

7. The wheelset transmission according to claim 1 , wherein the shifting device is shiftable to a neutral position in which the third and the fourth spur gears are freely rotatable relative to the intermediate shaft so that a force flow, between the input shaft and the drive output shaft, is interrupted.

8. The wheelset transmission according to claim 1 , wherein a drive output stage forms a third spur gear pair which has a fifth spur gear arranged rotationally fixed on the intermediate shaft and a sixth spur gear arranged rotationally fixed on the drive output shaft, and the third spur gear pair is arranged, relative to the first and the second spur gear pairs, on a side of the transmission facing toward the drive motor.

9. The wheelset transmission according to claim 1 , wherein the shifting device being axially movable to selectively engage only one of the two transmission stages at a time into a flow of force from the input shaft to the output shaft.

10. The wheelset transmission according to claim 1 , wherein the shifting device being axially movable between at least first and second positions such that:
in the first position, the shifting device rotationally couples the third spur gear to the intermediate shaft and the fourth spur gear is disengaged from the intermediate shaft, and
in the second position, the shifting device rotationally couples the fourth spur gear to the intermediate shaft and the third spur gear is disengaged from the intermediate shaft.

11. The wheelset transmission according to claim 1 , wherein the third and the fourth spur gears in each case being mounted, via a bearing, on the bearing support studs independent of the intermediate shaft.

12. The wheelset transmission according to claim 1 , wherein the third and the fourth spur gears being rotatable about the intermediate shaft axis relative to the intermediate shaft.

13. A power-train for a rail vehicle, having an electric drive motor connected by a shaft coupling so as to drive an input shaft of a wheelset transmission,
wherein the wheelset transmission comprises the input shaft, an intermediate shaft and a drive output shaft,
the drive output shaft is either formed as a wheelset shaft or is connected, via a sprung component, to the wheelset shaft,
the wheelset transmission comprises at least two selectively shiftable transmission stages with different transmission ratios for a same travel direction, and a shifting device for engaging the transmission stages,
an actuator of the shifting device is arranged close to the shaft coupling in such a manner so that, during operation, the rotating shaft coupling produces an airflow in an area of the actuator such that the actuator is cooled by the airflow, and
the sprung component comprises a cardan coupling.

14. The power-train according to claim 13 , wherein a wheel-disk brake is arranged in an area of a wheel disk and is arranged in an axial and a radial direction at least partially in an area of a maximum projected dimension of a housing of the transmission.

15. A wheelset transmission for a power-train of a rail vehicle, the wheelset transmission comprising:
an input shaft,
a hollow intermediate shaft having an axial bore,
a drive output shaft,
the input shaft being drivably connectable to a drive motor;
at least first and second spur gear pairs having different transmission ratios for a common travel direction, and a shifting device for selectively engaging the first and the second spur gear pairs;
the first spur gear pair having a first spur gear and a third spur gear;
the second spur gear pair having a second spur gear and a fourth spur gear;
the first and the second spur gears being connected to the input shaft in a rotationally fixed manner so as to rotate with the input shaft;
the third and the fourth spur gears being rotatably supported on a respective bearing support stud which being fixed to a housing of the wheelset transmission such that the third and the fourth spur gears are rotatable about an intermediate shaft axis;
the shifting device comprises a shifting member which is rotationally fixedly mounted and axially movably relative to the intermediate shaft, and the shifting member is axially movable by an actuator of the shifting device such that either the third spur gear or the fourth spur gear is selectively connectable to the intermediate shaft in a rotationally fixed manner; and
the shifting member is actuatable by the actuator through the axial bore in the intermediate shaft.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Sacher Christoph

Classifications

• B61C9/12 Primary

  with change-speed gearing · CPC title

• F16H61/30

  Hydraulic {or pneumatic} motors {or related fluid control means} therefor · CPC title

• F16H3/089 Primary

  all of the meshing gears being supported by a pair of parallel shafts, one being the input shaft and the other the output shaft, there being no countershaft involved · CPC title

• F16H2200/0034

  the gear ratios comprising two forward speeds · CPC title

• B61C3/00

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