Power shift transmission

Patent metadata

Field	Value
Publication number	US-9109665-B2
Application number	US-201214355205-A
Country	US
Kind code	B2
Filing date	Oct 17, 2012
Priority date	Oct 31, 2011
Publication date	Aug 18, 2015
Grant date	Aug 18, 2015

Abstract

A power shift transmission has an input shaft, a first output shaft coaxial to the input shaft, a planetary transmission with a planet carrier, which is connected to the input shaft, and at least three shift elements. To minimize drag from open shift elements and to optimize shift times of a connectable synchromesh transmission, the planetary transmission has at least two stepped planetary sets, which may be mounted on a common planet carrier. Each stepped planetary set meshes on input and output sides with at least one sun gear. The first output shaft is connected to an output side sun associated with one stepped planetary set by a first shift element, the first output shaft is connected to an output side sun associated with another stepped planetary set by a second shift element, and input side sun gears are blocked relative to the transmission housing by a third shift element.

First claim

The invention claimed is:

1. A power shift transmission, comprising:
an input shaft;
a first output shaft arranged coaxially to the input shaft;
at least three shift elements; and
a planetary transmission having a planet carrier, at least two stepped planetary gear sets, and at least two sun gear sets, wherein the planet carrier carries the at least two stepped planetary gear sets and is coupled to the input shaft;
wherein a first of the at least two stepped planetary gear sets includes a first input side planet gear and a first output side planet gear, and a second of the at least two stepped planetary gear sets includes a second input side planet gear and a second output side planet gear, and wherein a first of the at least two sun gear sets includes a first input side sun gear and a first output side sun gear, and a second of the at least two sun gear sets includes a second input side sun gear and a second output side sun gear, whereby the first and second input side planet gears mesh with the associated first and second input side sun gears, and the first and second output side planet gears mesh with the associated first and second output side sun gears; and
wherein in a first operating condition the first output shaft is connected to the first output side sun gear by a first of the at least three shift elements, wherein in a second operating condition the first output shaft is connected to the second output side sun gear by a second of the at least three shift elements, and in a third operating condition the first and second input side sun gears are blocked by a third of the at least three shift elements.

2. The power shift transmission of claim 1 , wherein for each operating condition of the power shift transmission, two of the at least three shift elements are closed.

3. The power shift transmission of claim 2 , wherein in the first operating condition the first and the second of the at least three shift elements are closed and the third of the at least three shift elements is open, whereby in the first operating condition the direction of rotation and the rotational speed of the input shaft and the first output shaft are the same.

4. The power shift transmission of claim 3 , wherein in the second operating condition the first and third of the at least three shift elements are closed and the second of the at least three shift elements is open, whereby in the second operating condition the direction of rotation of the input shaft and the first output shaft are the same and their rotational speeds are different.

5. The power shift transmission of claim 4 , wherein in the third operating condition the second and third of the at least three shift elements are closed and the first of the at least three shift elements is open, whereby in the third operating condition the direction of rotation and the rotational speed of the input shaft and the first output shaft are different.

6. The power shift transmission of claim 1 , wherein the first and second input side sun gears are mounted in a torque-proof manner on a hollow shaft mounted coaxially to the input shaft, whereby the first and second input side sun gears are blocked by engaging the hollow shaft with the third of the at least three shift elements.

7. The power shift transmission of claim 6 , wherein the third of the at least three shift elements is configured as a brake, whereby the brake is connected in a torque-proof manner on an input side to the hollow shaft and on an output side to a housing component of the power shift transmission.

8. The power shift transmission of claim 1 , wherein the first output shaft is configured as a hollow shaft through which extends a second output shaft that is connected to the input shaft.

9. The power shift transmission of claim 1 , wherein the first and second of the at least three shift elements are configured as clutches, whereby the clutches are connected in a torque-proof manner on an input side with one of the output side sun gears and on an output side with the first output shaft.

Assignees

• Deere & Co

Inventors

• Otten Ulrich
• Schaller Martin

Classifications

• F16H2200/0034

  the gear ratios comprising two forward speeds · CPC title

• F16H2200/0004

  comprising a power take off shaft · CPC title

• F16H37/046

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

• F16H2200/2007

  with two sets of orbital gears · CPC title

• F16H3/46 Primary

  Gearings having only two central gears, connected by orbital gears (F16H3/68 - F16H3/78 take precedence) · CPC title