Transmission assembly for a motor vehicle and motor vehicle

Patent metadata

Field	Value
Publication number	US-2016010728-A1
Application number	US-201514795110-A
Country	US
Kind code	A1
Filing date	Jul 9, 2015
Priority date	Jul 9, 2014
Publication date	Jan 14, 2016
Grant date	—

Abstract

The invention relates to a 9-speed transmission made up of two simple planetary gear sets including a drive group and an output group designed as a Ravigneaux set having six shift elements, namely three clutches and three brakes, certain specific embodiments being expandable to form an 11-speed transmission by adding a fourth brake.

First claim

1 . A transmission system for a motor vehicle, comprising:
a drive stage configured to be coupled to a drive assembly of the motor vehicle via an input shaft ( 1 ), an output stage connected to the drive stage via a first connecting shaft (CON 1 ) and a second connecting shaft (CON 2 ) and configured to be coupled to an output of the motor vehicle via an output shaft, and a transmission housing surrounding the drive stage and the output stage, the drive stage comprising:
a first planetary gear set ( 10 ) having a first sun gear ( 101 ), a first ring gear ( 102 ) and a first planet carrier ( 103 ) on which a set of first planet gears is rotatably mounted, said set of first planet gears being configured to mesh with the first sun gear ( 101 ) on a first side of the first planet carrier and with the first ring gear ( 102 ) on a second side of the first planet carrier,
a second planetary gear set ( 20 ) having a second sun gear ( 201 ), a second ring gear ( 202 ) and a second planet carrier ( 203 ) on which a set of second planet gears is rotatably mounted, said set of second planet gears being configured to mesh with the second sun gear ( 201 ) on a first side of the second planet carrier and with the second ring gear ( 202 ) on a second side of the second planet carrier, and
a first clutch (K 1 ) and a second clutch K 2 ), each configured to shiftably couple one element of each of the first and second planetary gear sets ( 10 , 20 ) of the drive stage to each other, and a first brake (B 1 ) and a second brake (B 2 ), each configured to shiftably couple one element of each of the first and second planetary gear sets ( 10 , 20 ) of the drive stage to the housing,
wherein the output stage comprises:
a Ravigneaux planetary gear set ( 30 ) having a first Ravigneaux sun gear ( 311 ), a second Ravigneaux sun gear ( 312 ), a Ravigneaux ring gear ( 302 ) and a Ravigneaux planet carrier ( 303 ) on which two sets of Ravigneaux planet gears are rotatably mounted, namely one set of short planet gears ( 331 ) and one set of stepped long planet gears ( 332 ) having one larger and one smaller long planet stage, wherein one long planet stage meshes with the short planet gears ( 331 ), one of the first or second Ravigneaux sun gears ( 311 , 312 ) meshes with the set of short planet gears ( 331 ), and the Ravigneaux ring gear ( 302 ) meshes with one of the sets of Ravigneaux planet gears ( 331 , 332 ), and the other of the Ravigneaux sun gears ( 312 , 311 ) meshes with the long planet stage that is not meshing with the short planet gears ( 331 ),
a third clutch (K 3 ) configured to shiftably couple one element of the Ravigneaux planetary gear set ( 30 ) to the second connecting shaft (CON 2 ), and
a third brake (B 3 ) configured to shiftably couple the first Ravigneaux sun gear ( 311 ) to the housing.

2 . The transmission system as recited in claim 1 , wherein the input shaft ( 1 ) is connected to the second sun gear ( 201 ) and the second connecting shaft (CON 2 ).

3 . The transmission system as recited in claim 1 , wherein:
the first connecting shaft (CON 1 ) is connected to the first ring gear ( 102 ), and the first planet carrier ( 103 ) is connected to the second ring gear ( 202 ); the second sun gear ( 201 ) is shiftably coupled to the second planet carrier ( 203 ) via the first clutch (K 1 ); the first ring gear ( 102 ) is shiftably coupled to the second planet carrier ( 203 ) via the second clutch (K 2 ); the second planet carrier ( 203 ) is shiftably coupled to the housing via the first brake (B 1 ); and the first sun gear ( 101 ) is shiftably coupled to the housing via the second brake.

4 . The transmission system as recited in claim 1 , wherein:
the first connecting shaft (CON 1 ) is connected to the second ring gear ( 202 ), and the second planet carrier ( 203 ) is connected to the first ring gear ( 102 ); the first planet carrier ( 103 ) is shiftably coupled to the second sun gear ( 201 ) via the first clutch (K 1 ); the first planet carrier ( 103 ) is shiftably coupled to the second ring gear ( 202 ) via the second clutch (K 2 ); the first planet carrier ( 103 ) is shiftably coupled to the housing via the first brake (B 1 ); and the first sun gear ( 101 ) is shiftably coupled to the housing via the second brake (B 2 ).

5 . The transmission system as recited in claim 1 , wherein the first connecting shaft (CON 1 ) is connected to the second Ravigneaux sun gear ( 312 ).

6 . The transmission system as recited in claim 1 , wherein: the Ravigneaux planet carrier ( 303 ) is shiftably coupled to the second connecting shaft (CON 2 ) via the third clutch (K 3 ); and
the output shaft ( 2 ) is connected to the Ravigneaux ring gear ( 302 ).

7 . The transmission system as recited in claim 1 , wherein:
the Ravigneaux ring gear ( 302 ) is shiftably coupled to the second connecting shaft (CON 2 ) via the third clutch (K 3 ); and the output shaft ( 2 ) is connected to the Ravigneaux planet carrier ( 303 ).

8 . The transmission system as recited in claim 1 , wherein the drive group includes a fourth brake shiftably coupled to the housing via the first planet carrier ( 103 ).

9 . A motor vehicle comprising a drive train comprising:
the transmission system according to claim 1 , which, on the input side, is coupled via an input shaft ( 1 ) to the drive assembly, and, on the output side, is coupled via the output shaft ( 2 ) to the output, wherein the input shaft ( 1 ) is connected to the first planet carrier and the output shaft ( 2 ) is connected to the fourth planet carrier.

Assignees

• Volkswagen Ag

Inventors

• Scholz Norbert

Classifications

• F16H2200/2023

  using a Ravigneaux set with 4 connections · CPC title

• F16H2200/2048

  with seven engaging means · CPC title

• F16H2200/2046

  with six engaging means · CPC title

• F16H2200/0073

  the gear ratios comprising eleven forward speeds · CPC title

• F16H2200/0065

  the gear ratios comprising nine forward speeds · CPC title