Transmission arrangement and drive train for a hybrid vehicle, and hybrid vehicle

Patent metadata

Field	Value
Publication number	US-9340101-B2
Application number	US-201514597836-A
Country	US
Kind code	B2
Filing date	Jan 15, 2015
Priority date	Jan 23, 2014
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A transmission arrangement for a hybrid vehicle includes an electric machine having a stator and a rotor. An electric-motor input shaft is connected to the rotor. A Ravigneaux gear set has a carrier, a set of long planets, a set of short planets, a ring gear, a first sun, and a second sun. The short planets mesh with the long planets. The ring gear meshes with the short planets and is connected to an output shaft. The first sun meshes with the short planets and is connected to the electric-motor input shaft. The second sun meshes with the long planets. The carrier is fixable on a transmission housing by a brake. The carrier, the second sun and an internal-combustion-engine input shaft are selectively couplable to one another in a torque-transmitting manner by a shiftable clutch arrangement. A hybrid vehicle and a drive train for a hybrid vehicle are also provided.

First claim

What is claimed is:

1. A transmission arrangement for a hybrid vehicle, comprising:
a transmission housing;
an electric machine provided in said transmission housing, said electric machine having a stator fixed relative to said transmission housing and a rotatably mounted rotor;
an electric-motor input shaft connected to said rotor;
an internal-combustion-engine input shaft;
an output shaft;
a Ravigneaux gear set having a carrier, a set of long planets, a set of short planets, a ring gear, a first sun, and a second sun, said set of long planets and said set of short planets being mounted rotatably on said carrier, said short planets meshing with said long planets, said ring gear meshing with said short planets and being connected to said output shaft, said first sun meshing with said short planets and being connected to said electric-motor input shaft, said second sun meshing with said long planets;
a brake, said carrier being fixable on said transmission housing by said brake; and
a shiftable clutch arrangement, said carrier, said second sun and said internal-combustion-engine input shaft being selectively couplable to one another in a torque-transmitting manner by said shiftable clutch arrangement.

2. The transmission arrangement according to claim 1 , including an auxiliary shaft, said carrier being connected to said auxiliary shaft, said brake and said shiftable clutch arrangement engaging on said auxiliary shaft.

3. The transmission arrangement according to claim 1 , wherein:
said shiftable clutch arrangement includes a first clutch, a second clutch, and a third clutch;
said carrier and said second sun are couplable to one another for conjoint rotation by said first clutch;
said carrier and said internal-combustion-engine input shaft are couplable to one another for conjoint rotation by said second clutch; and
said second sun and said internal-combustion-engine input shaft are couplable to one another for conjoint rotation by said third clutch.

4. The transmission arrangement according to claim 1 , wherein:
said shiftable clutch arrangement includes a freewheel, said freewheel connects an engine-side section of said internal-combustion-engine input shaft and a transmission-side section of said internal-combustion-engine input shaft in a directionally selective manner; and
said shiftable clutch arrangement includes two clutches, a first one of said two clutches couples said second sun and a second one of said two clutches couples said carrier, to said transmission-side section of said internal-combustion-engine input shaft in a shiftable manner.

5. The transmission arrangement according to claim 3 , including:
an auxiliary shaft, said carrier being connected to said auxiliary shaft, said brake and said shiftable clutch arrangement engaging on said auxiliary shaft;
said first, said second, and said third clutch of said shiftable clutch arrangement being combined in a shiftable clutch unit with five shifting positions for coupling three gearshift shafts for conjoint rotation;
in a first shifting position, a first one of said three gearshift shafts, namely said second sun, being coupled to a second one of said three gearshift shafts, namely said auxiliary shaft, for conjoint rotation;
in a second shifting position, said first one of said three gearshift shafts being coupled to a third one of said three gearshift shafts, namely said internal-combustion-engine input shaft, for conjoint rotation;
in a third shifting position, all three of said three gearshift shafts being coupled to one another for conjoint rotation;
in a fourth shifting position, a second one of said three gearshift shafts being coupled to said third one of said three gearshift shaft for conjoint rotation; and
in a neutral position, said three gearshift shafts being uncoupled from one another within said shiftable clutch unit.

6. The transmission arrangement according to claim 5 , wherein:
said shiftable clutch unit includes a sliding sleeve having an internal toothing with two axially spaced-apart axial regions;
said shiftable clutch unit includes toothed bodies with respective external toothings, said toothed bodies are provided fixedly on said gearshift shafts;
said first one and said third one of said three gearshift shafts are configured as hollow shafts and are spaced apart axially from one another, said second one of said three gearshift shafts passes coaxially through said first one and said third one of said three gearshift shafts; and
the five shifting positions of said shiftable clutch unit are distinguished by different axial positions of said sliding sleeve, wherein said sliding sleeve is mounted in an axially displaceable manner and so as to be rotationally decoupled with respect to said transmission housing and, depending on a respective one of the shifting positions, by a toothed engagement of said internal toothing of said sliding sleeve in said external toothings of said toothed bodies interacts in a coupling manner with said toothed bodies for conjoint rotation.

7. The transmission arrangement according to claim 1 , wherein:
said brake is a first brake; and
a second brake is provided, said first sun is fixable on said transmission housing by said second brake.

8. The transmission arrangement according to claim 7 , including:
an auxiliary shaft, said carrier being connected to said auxiliary shaft, said first brake and said shiftable clutch arrangement engaging on said auxiliary shaft;
said first and said second brake being combined in a shiftable brake unit with three shifting positions including a first shifting position, a second shifting position, and a neutral position for coupling two brake shafts to said transmission housing in a manner fixed against relative rotation;
in the first shifting position, said transmission housing being coupled, in a manner fixed against relative rotation, to a first one of said two brake shafts, namely said first sun;
in the second shifting position, said transmission housing being coupled to a second one of said two brake shafts, namely said auxiliary shaft, in a manner fixed against relative rotation; and
in the neutral position, said transmission housing being coupled to neither of said two brake shafts in a manner fixed against relative rotation.

9. The transmission arrangement according to claim 8 , including:
a hub, said two brake shafts being mounted on said hub and being disposed so as to pass through one another coaxially;
a sliding sleeve, said sliding sleeve being coupled fixed against relative rotation and in an axially displaceable manner to said transmission housing, said sliding sleeve reaching radially through said hub;
said sliding sleeve having an external toothing and an internal toothing;
said first one of said two brake shafts having an internal toothing and being configured as a hollow shaft;
said second one of said two brake shafts having an external toothing and being mounted within said first one of said two brake shafts; and
the three shifting positions of said shiftable brake unit being distinguished by different axial positions of said sliding sleeve and, depending on respective ones of the shifting positions, through a toothed engagement of said external toothing of said sliding sleeve in said internal toothing of said first one of said two brake shafts, said sliding sleeve interacting in a coupling manner with said first one of said two brake shafts in a manner fixed against relative rotation, or through a toothed engagement of said internal toothing of said sliding sleeve in said external toothing of said second one of said two brake shafts, said sliding sleeve interacting in a coupling manner with said second one of said two brake shafts

Assignees

• Volkswagen Ag

Inventors

• Meiβner Christian
• Schröder Hendrik
• Petersen Rainer
• Möckel Jörg

Classifications

• Y02T10/62

  Hybrid vehicles · CPC title

• F16H3/725

  with means to change ratio in the mechanical gearing · CPC title

• B60K6/365

  with the gears having orbital motion · CPC title

• Y02T10/6221

  Cross-Sectional Technologies · mapped topic

• B60K2006/4816

  Electric machine connected or connectable to gearbox internal shaft · CPC title