Transmission for a Vehicle

Patent metadata

Field	Value
Publication number	US-2016333985-A1
Application number	US-201615149718-A
Country	US
Kind code	A1
Filing date	May 9, 2016
Priority date	May 11, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

A transmission for a motor vehicle includes a drive shaft, an upstream gear set and a main gear set. A shaft of the upstream gear set is configured to make available reduced rotational speed and is a component of a first power path at a first shaft of the main gear set. The drive shaft is a component of a second power path at a second shaft of the main gear set.

First claim

1 - 15 . (canceled)

16 . A transmission for a motor vehicle, comprising
a drive shaft; an output shaft; an upstream gear set having one shaft configured to rotate at an increased rotational speed relative to a rotational speed of the drive shaft, the upstream gear set having an additional shaft configured to rotate at a reduced rotational speed relative to the rotational speed of the drive shaft, the upstream gear set configured such that a fixed transmission ratio is defined between the increased rotational speed of the one shaft, the reduced rotational speed of the additional shaft and the rotational speed of the drive shaft; a main gear set comprising a first planetary gear set and a second planetary gear set, the first and second planetary gear sets collectively having a first shaft, a second shaft, a third shaft and a fourth shaft, the additional shaft of the upstream gear set is connectable in a first power path to the first shaft of the main gear set, the drive shaft is connectable in a second power path to the second shaft of the main gear set; an electric motor with a rotatable rotor and a torque-proof stator, the rotor of the electric motor constantly connected to the one shaft of the upstream gear set; and at least three shift elements, selective meshing of two of the at least three shift elements determining a rotational speed relationship between the first, second, third and fourth shafts of the main gear set and producing a plurality of forward gears between the drive shaft and the output shaft.

17 . The transmission of claim 16 , wherein:
the at least three shift elements has a total of five shift elements; the first shaft of the main gear set is fixable in a torque-proof manner by a third shift element of the five shift elements; the first shaft of the main gear set connectable to the additional shaft of the upstream gear set by a second shift element of the five shift elements; the second shaft of the main gear set fixable in a torque-proof manner by a fourth shift element of the five shift elements; the second shaft of the main gear set connectable to the drive shaft by a fifth shift element of the five shift elements; the third shaft of the main gear set constantly connected to the output shaft; and the fourth shaft of the main gear set connectable to either the drive shaft or to additional shaft of the upstream gear set by a first shift element of the five shift elements.

18 . The transmission of claim 17 , wherein:
the first shift element and the fourth shift element are closed in a first forward gear of the plurality of forward gears; the first shift element and the third shift element are closed in a second forward gear of the plurality of forward gears; the first shift element and the second shift element are closed in a third forward gear of the plurality of forward gears; the first shift element and the fifth shift element are closed in a fourth forward gear of the plurality of forward gears; the second shift element and the fifth shift element are closed in a fifth forward gear of the plurality of forward gears; and the third shift element and the fifth shift element are closed in a six forward gear of the plurality of forward gears.

19 . The transmission of claim 17 , wherein the second shift element and the fourth shift element are closed in a reverse gear.

20 . The transmission of claim 17 , wherein the first shift element is a positive-locking shift element.

21 . The transmission of claim 17 , wherein the fourth shift element is a positive-locking shift element.

22 . The transmission of claim 16 , wherein:
the upstream gear set comprises a third planetary gear set and a fourth planetary gear set, the third and fourth planetary gear sets forming a Ravigneaux gear set with a combined ring gear; a sun gear of the fourth planetary gear is fixed in a torque-proof manner; a common carrier of the third and fourth planetary gear sets is constantly connected to the drive shaft; a sun gear of the third planetary gear set is constantly connected to the rotor; and the combined ring gear of the third and fourth planetary gear sets is a component of the additional shaft of the upstream gear set.

23 . The transmission of claim 16 , wherein:
the upstream gear set comprises a third planetary gear set and a fourth planetary gear set, the third and fourth planetary gear sets forming a Ravigneaux gear set with a combined sun gear; the combined sun gear of the third and fourth planetary gear sets constantly fixed in a torque-proof manner; a ring gear of the fourth planetary gear set is a component of the additional shaft of the upstream gear set; a common bar of the third and fourth planetary gear set constantly is connected to the drive shaft; and a ring gear of the third planetary gear set is constantly connected to the rotor.

24 . The transmission of claim 16 , wherein:
the upstream gear set comprises a third planetary gear set and a fourth planetary gear set, the third and fourth planetary gear sets each formed as negative gear sets; a combined ring gear of the third and fourth planetary gear sets is constantly fixed in a torque-proof manner; a carrier of the third planetary gear set and a carrier of the fourth planetary gear set are connected to each other and are components of the additional shaft of the upstream gear set; a sun gear of the fourth planetary gear set is constantly connected to the drive shaft; and a sun gear of the third planetary gear set is constantly connected to the rotor.

25 . The transmission of claim 16 , wherein:
the upstream gear set comprises a third planetary gear set and a fourth planetary gear set, the third and fourth planetary gear sets formed as negative gear sets; the fourth planetary gear set is positioned radially within the third planetary gear set; a sun gear of the third planetary gear set is formed on an outside diameter of a ring gear of the fourth planetary gear set; a ring gear of the third planetary gear set is constantly connected to the drive shaft; a carrier of the third planetary gear set and a carrier of the fourth planetary gear set are components of the additional shaft of the upstream gear set; a sun gear of the fourth planetary gear set is constantly connected to the rotor; and the ring gear of the fourth planetary gear set is constantly fixed in a torque-proof manner.

26 . The transmission of claim 16 , wherein:
the main gear set is a Ravigneaux gear set with a combined ring gear; a sun gear of the first planetary gear set forming a component of the first shaft; a common carrier of the first and second planetary gear sets is a component of the second shaft; a combined ring gear of the first and second planetary gear sets is a component of the third shaft; and a sun gear of the second planetary gear set is a component of the fourth shaft.

27 . The transmission of claim 16 ; wherein:
the first and second planetary gear sets of the main gear set are formed as negative gear sets; a sun gear of the first planetary gear set is a component of the first shaft; a carrier of the first planetary gear set and a ring gear of the second planetary gear set are components of the second shaft; a ring gear of the first planetary gear set and a carrier of the second planetary gear set are components of the third shaft; and a sun gear of the second planetary gear set is a component of the fourth shaft.

28 . The transmission of claim 16 , wherein:
the first and second planetary gear sets of the main gear set are formed as negative gear sets; the second planetary gear set is positioned radially wit

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Ziemer Peter
• Beck Stefan
• Brehmer Martin
• Horn Matthias
• Kaltenbach Johannes
• King Julian
• Moraw Jens
• Münch Eckehard
• Pawlakowitsch Juri
• Scharr Stephan
• Warth Viktor
• Wechs Michael
• Griesmeier Uwe
• Kuberczyk Raffael

Classifications

• F16H2200/2023

  using a Ravigneaux set with 4 connections · CPC title

• B60K6/365 Primary

  with the gears having orbital motion · CPC title

• F16H2200/2012

  with four sets of orbital gears · CPC title

• B60K6/547

  the transmission being a stepped gearing · CPC title

• F16H2200/2007

  with two sets of orbital gears · CPC title