Gearbox with a PTO clutch with integrated shaft brake

Patent metadata

Field	Value
Publication number	US-10315514-B2
Application number	US-201515527959-A
Country	US
Kind code	B2
Filing date	Dec 1, 2015
Priority date	Dec 10, 2014
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

The present invention relates to a device for a gearbox which comprises a main shaft, a counter shaft, a plurality of gearwheel pairs each comprises a primary gearwheel arranged on the counter shaft and a secondary gearwheel arranged on the main shaft and a PTO shaft. The device comprises a switch mechanism movably arranged to a first position in which the PTO shaft is disconnected from the counter shaft in a non-rotatable state, to a second position in which the PTO shaft is rotationally fixedly connected to the counter shaft, and to a neutral position in which the PTO shaft is in a rotatable state and disconnected from the counter shaft. The device comprises further a clutch mechanism able to provide a clutching connection between the counter shaft and the PTO shaft when the switch mechanism is in the first position and in the neutral position.

First claim

The invention claimed is:

1. A device for a gearbox, where the gearbox comprises a main shaft, a counter shaft, a plurality of gearwheel pairs which each comprises a primary gearwheel arranged on the counter shaft and a secondary gearwheel arranged on the main shaft and a PTO shaft, wherein the device comprises:
a switch mechanism movably arranged to a first position in which the PTO shaft is disconnected from the counter shaft in a non-rotatable state and to a second position in which the PTO shaft is rotationally fixedly connected to the counter shaft, wherein the that switch mechanism is movably arranged to a neutral position in which the PTO shaft is disconnected from the counter shaft in a rotatable state; and
a clutch mechanism able to provide a clutching connection between the counter shaft and the PTO shaft when the switch mechanism is in the first position and in the neutral position.

2. A device according to claim 1 , wherein the device is arranged in an area in the vicinity of an end portion of the counter shaft and an end portion of the PTO shaft.

3. A device according to claim 1 , wherein the device is arranged in an area in the vicinity of the end portions of a counter shaft and a PTO shaft which are coaxially arranged in the gearbox.

4. A device according to claim 1 , wherein the clutch mechanism comprises:
at least one primary friction disc rotationally fixedly connected to the counter shaft;
at least one secondary friction disc rotationally fixedly connected to the PTO shaft; and
a clutch actuator configured to move the primary friction disc and the secondary friction disc against each other in order to establish a clutching connection between the counter shaft and the PTO shaft.

5. A device according to claim 4 , wherein a coupling disc is arranged between the friction discs and the clutch actuator.

6. A device according to claim 4 , wherein the primary friction disc and/or the second friction disc are movably arranged in an axial direction in relation to their respective axes.

7. A device according to claim 1 , wherein the switch mechanism comprises a coupling sleeve which is movably arranged to the first position, the second position and the neutral position.

8. A device according to claim 7 , wherein said coupling sleeve is, in the neutral position, rotationally fixedly connected to the PTO shaft and disconnected from the counter shaft and the stationary component.

9. A device according to claim 7 , wherein said coupling sleeve is rotationally fixedly connected to the PTO shaft via a first component.

10. A device according to claim 9 , wherein said first component is a coupling disc rotationally fixedly connected to the PTO shaft and provided with a teeth portion at an outer periphery to be in constant engagement with a teeth portion of the coupling sleeve.

11. A device according to claim 9 , wherein the coupling sleeve is configured to establish a rotationally fixed connection between said first component and a second stationary component in the gearbox in the first position.

12. A device according to claim 9 , wherein said coupling sleeve is configured to establish a rotationally fixed connection between said first component and a third component which is rotationally fixedly connected to the counter shaft in the second position.

13. A device according to claim 12 , wherein the third component is a support member for the primary friction disc, wherein the support member is provided with a teeth portion at an outer periphery to be engageable with a teeth portion of the coupling sleeve.

14. A gearbox comprising
a main shaft;
a counter shaft;
a plurality of gearwheel pairs which each comprises a primary gearwheel arranged on the counter shaft and a secondary gearwheel arranged on the main shaft and a PTO shaft; and
a device comprising:
a switch mechanism movably arranged to a first position in which the PTO shaft is disconnected from the counter shaft in a non-rotatable state and to a second position in which the PTO shaft is rotationally fixedly connected to the counter shaft, wherein the that switch mechanism is movably arranged to a neutral position in which the PTO shaft is disconnected from the counter shaft in a rotatable state; and
a clutch mechanism able to provide a clutching connection between the counter shaft and the PTO shaft when the switch mechanism is in the first position and in the neutral position.

15. A gearbox according to claim 14 , wherein the device is arranged in an area in the vicinity of an end portion of the counter shaft and an end portion of the PTO shaft.

16. A gearbox according to claim 14 , wherein the device is arranged in an area in the vicinity of the end portions of a counter shaft and a PTO shaft which are coaxially arranged in the gearbox.

17. A gearbox according to claim 14 , wherein the clutch mechanism comprises:
at least one primary friction disc rotationally fixedly connected to the counter shaft;
at least one secondary friction disc rotationally fixedly connected to the PTO shaft; and
a clutch actuator configured to move the primary friction disc and the secondary friction disc against each other in order to establish a clutching connection between the counter shaft and the PTO shaft.

18. A vehicle comprising:
a gearbox comprising:
a main shaft;
a counter shaft;
a plurality of gearwheel pairs which each comprises a primary gearwheel arranged on the counter shaft and a secondary gearwheel arranged on the main shaft and a PTO shaft; and

a device comprising:
a switch mechanism movably arranged to a first position in which the PTO shaft is disconnected from the counter shaft in a non-rotatable state and to a second position in which the PTO shaft is rotationally fixedly connected to the counter shaft, wherein the that switch mechanism is movably arranged to a neutral position in which the PTO shaft is disconnected from the counter shaft in a rotatable state; and
a clutch mechanism able to provide a clutching connection between the counter shaft and the PTO shaft when the switch mechanism is in the first position and in the neutral position.

19. A vehicle according to claim 18 , wherein the device is arranged in an area in the vicinity of an end portion of the counter shaft and an end portion of the PTO shaft.

20. A vehicle according to claim 18 , wherein the device is arranged in an area in the vicinity of the end portions of a counter shaft and a PTO shaft which are coaxially arranged in the gearbox.

Assignees

• Scania Cv Ab

Inventors

• Häggström Daniel
• Norberg Peer

Classifications

• F16H3/091

  including a single countershaft · CPC title

• F16H2200/2005

  with one sets of orbital gears · CPC title

• F16H2200/006

  the gear ratios comprising eight forward speeds · CPC title

• B60K17/28 Primary

  characterised by arrangement, location, or type of power take-off · CPC title

• F16H37/046

  with an additional planetary gear train, e.g. creep gear, overdrive · CPC title