Electric axle drive for a motor vehicle

Patent metadata

Field	Value
Publication number	US-9855830-B2
Application number	US-201514942175-A
Country	US
Kind code	B2
Filing date	Nov 16, 2015
Priority date	Nov 25, 2014
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

An electric axle drive ( 1 ) for a motor vehicle has an electric machine ( 2 ) for driving at least one output shaft ( 15, 16 ) of the axle ( 13 ) of the motor vehicle and has a spur gear unit ( 5 ) with two spur gear stages ( 6, 7 ). The electric machine ( 2 ) can drive the spur gear stages ( 6, 7 ), which, in turn, can drive a planetary gear unit ( 14 ). The planetary gear unit ( 14 ) can be shifted between two gears. In the first gear, a transmission ratio is shifted in the planetary gear unit ( 14 ), and, in the second gear, the planetary gear unit ( 14 ) is shifted as a block.

First claim

What is claimed is:

1. An electric axle drive for a motor vehicle, comprising:
an electric machine;
a spur gear unit having two spur gear stages that can be driven by the electric machine;
a planetary gear unit that can be driven by the two spur gear stages for driving at least one output shaft of an axle of the motor vehicle, the planetary gear unit being shiftable between first and second gears, wherein in the first gear a transmission ratio is shifted in the planetary gear unit and in the second gear the planetary gear unit is shifted as a block, wherein the output of the planetary gear unit drives a planetary differential whose output is assigned two output shafts, the planetary differential having a Ravigneaux-type planetary set.

2. The electric axle drive of claim 1 , wherein a center axis of the planetary gear unit is coaxial with a center axis of the at least one output shaft.

3. The electric axle drive of claim 2 , wherein an output gear wheel of the spur gear unit is connected to a ring gear of the planetary gear unit.

4. The electric axle drive of claim 3 , wherein the planetary gear unit has a planetary carrier and planetary gears mounted in the planetary carrier, the planetary gears meshing with the ring gear and a sun gear of the planetary gear unit, the planetary carrier forming an output of the planetary gear unit and being operative to drive the at least one output shaft.

5. The electric axle drive of claim 4 , wherein in the first gear a brake for blocking the sun gear is closed, and a clutch for coupling the sun gear and ring gear is opened.

6. The electric drive of claim 5 , wherein in the second gear a brake for blocking the sun gear is opened, and a clutch for coupling the sun gear and the ring gear is closed.

7. The electric axle drive of claim 4 , wherein in the first gear a freewheel blocks the sun gear, and a clutch for coupling the sun gear and the ring gear is opened.

8. The electric axle drive of claim 4 , wherein in the second gear a freewheel releases the sun gear, and a clutch for coupling the sun gear and ring gear is closed.

9. The electric drive of claim 8 , wherein the freewheel is combined with a claw clutch for recuperation.

10. The electric axle drive of claim 8 , wherein shifting of the planetary gear unit is carried out by a single actuator.

11. The electric axle drive of claim 1 , further comprising a torque-vectoring unit.

12. An electric axle drive for a motor vehicle, comprising:
an electric machine;
a spur gear unit having two spur gear stages that can be driven by the electric machine;
a planetary gear unit that can be driven by the two spur gear stages for driving at least one output shaft of an axle of the motor vehicle, the planetary gear unit being shiftable between first and second gears, wherein in the first gear a transmission ratio is shifted in the planetary gear unit and in the second gear the planetary gear unit is shifted as a block; and
a torque-vectoring unit, wherein the torque-vectoring unit has a further electric machine and a superimposition gear unit for generating a differential torque between two output shafts.

13. The electric axle drive of claim 12 , wherein the torque-vectoring unit has a transmission stage arranged between the further electric machine and the superimposition gear unit.

14. The electric axle drive of claim 13 , wherein a center axis of the planetary gear unit is coaxial with a center axis of the planetary differential.

15. The electric axle drive of claim 14 , wherein the center axis of the planetary gear unit is coaxial with a center axis of the superimposition gear unit.

16. The electric axle drive of claim 15 , wherein the center axis of the planetary gear unit is coaxial with a center axis of the transmission stage.

17. The electric axle drive of claim 16 , wherein the center axis of the planetary gear unit is coaxial with a center axis of the further electric machine.

Assignees

• Porsche Ag
• Porsche Ag

Inventors

• Knoblauch Daniel

Classifications

• F16H2200/2079

  using freewheel type mechanisms, e.g. freewheel clutches · CPC title

• F16H2200/2005

  with one sets of orbital gears · CPC title

• F16H3/54

  one of the central gears being internally toothed and the other externally toothed · CPC title

• B60K2001/001

  one motor mounted on a propulsion axle for rotating right and left wheels of this axle · CPC title

• F16H2048/364

  using electric or hydraulic motors · CPC title