Electric axle drive device for a motor vehicle, and associated utility vehicle

Patent metadata

Field	Value
Publication number	US-11331992-B2
Application number	US-201816634417-A
Country	US
Kind code	B2
Filing date	Jun 25, 2018
Priority date	Jul 27, 2017
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

An electrical axle drive device includes at least one first electrical machine, which has a stator and a rotor rotatable around a machine axis of rotation relative to the stator. A gear unit is drivable by the first electrical machine having at least one first planetary gear stage drivable by the first electrical machine and at least one first spur gear stage drivable by the first electrical machine. The device also includes at least one drive wheel of the motor vehicle being able to be rotated around a wheel axis of rotation running parallel to the machine axis of rotation and being drivable by the first electrical machine via the gear unit. The first electrical machine is arranged at least partially on a first side of the longitudinal central plane with respect to a longitudinal central plane of the vehicle that is spanned by the vehicle vertical direction and the vehicle longitudinal direction and the first spur gear stage is arranged on a second side of the longitudinal central plane opposite the first side in the vehicle transverse direction.

First claim

The invention claimed is:

1. An electrical axle drive device for a motor vehicle, the electrical axle drive device comprising:
at least one first electrical machine, which has a stator and a rotor, wherein the rotor is rotatable around a machine axis of rotation relative to the stator;
a gear unit configured to be driven by the first electrical machine, the gear unit comprising
exactly two planetary gear stages configured to be driven by the at least one first electrical machine, wherein the exactly two planetary gear stages comprises a first planetary gear stage and a second planetary gear stage; and
exactly two spur gear stages, wherein the exactly two spur gear stages comprises a first spur gear stage and a second spur gear stage, wherein the first spur gear stage is configured to be driven by the at least one first electrical machine, wherein first spur gear stage includes a first spur gear and a second spur gear meshing with the first spur gear;

at least one drive wheel of the motor vehicle, the at least one drive wheel is rotatable around a wheel axis of rotation running parallel to the machine axis of rotation and is configured to be driven by the at least one first electrical machine via the gear unit;
an axle drive configured to be driven by the at least one first electrical machine via the gear unit, wherein the at least one drive wheel is configured to be driven by the at least one first electrical machine via the axle drive; and
a braking element, configured so that a gear element of the first planetary gear stage or a gear element of the second planetary gear stage is fixable to a housing of the gear unit, wherein the braking element has an internal gear that is displaceable in a axial direction of the secondary planetary gear stage relative to the housing,
wherein the at least one first electrical machine is arranged at least partially on a first side of a longitudinal central plane of the motor vehicle, wherein the longitudinal central plane is spanned by a vehicle vertical direction and a vehicle longitudinal direction,
wherein the first spur gear stage is arranged on a second side of the longitudinal central plane opposite the first side in a vehicle transverse direction, and
wherein, in relation to a torque flow from the at least one first electrical machine to the at least one drive wheel, the first planetary gear stage is arranged after the at least one first electrical machine and before the at least one drive wheel, the first spur gear stage is arranged after the first planetary gear stage and before the at least one drive wheel, the second planetary gear stage is arranged after the first spur gear stage and before the at least one drive wheel, and the second spur gear stage is arranged after the second planetary gear stage and before the at least one drive wheel.

2. The electrical axle drive device of claim 1 , further comprising:
at least one locking element configured to lock at least two gear elements of the second planetary gear stage with one another.

3. The electrical axle drive device of claim 1 , wherein the second planetary gear stage is predominantly arranged on the second side.

4. The electrical axle drive device of claim 1 , wherein the second gear stage is arranged substantially on the longitudinal central plane.

5. The electrical axle drive device of claim 1 , wherein the at least one electrical machine is arranged with at least two thirds of its volume on the first side.

6. The electrical axle drive device of claim 1 , further comprising:
a second electrical machine; and
a further spur gear, wherein the further spur gear is drivable by the second electrical machine and meshes with the second spur gear.

7. The electrical axle drive device of claim 6 , wherein the second electrical machine is arranged on a third side of a further plane of the motor vehicle, wherein the further plane of the motor vehicle is spanned by the vehicle transverse direction and the vehicle longitudinal direction, wherein the at least one first electrical machine is arranged on a fourth side of the further plane opposite the third side in the vehicle vertical direction.

8. The electrical axle drive device of claim 6 , wherein the second electrical machine is aligned with the at least one first electrical machine along a direction running perpendicular to the vehicle transverse direction.

9. The electrical axle drive device of claim 1 , wherein the first planetary gear stage, the at least one first electrical machine, and the first spur gear stage are arranged in a common housing, wherein the common housing is arranged so that it equally spans the first side and the second side.

10. The electrical axle drive device of claim 1 , wherein an oil cooler and power electronics are arranged on a side of the at least one first electrical machine facing away from the axle drive.

11. The electrical axle drive device of claim 1 , further comprising:
a second drive wheel;
a rigid axle device, wherein the at least one drive wheel and the second drive wheel are connected to one another via the rigid axle device; and
a partial housing configured to accommodate the gear unit, wherein the partial housing has a flange connected or contactable with a second flange of the axle drive.

12. A commercial motor vehicle, comprising:
an electrical axle drive, which comprises
at least one first electrical machine, which has a stator and a rotor, wherein the rotor is rotatable around a machine axis of rotation relative to the stator;
a gear unit configured to be driven by the first electrical machine, the gear unit comprising
exactly two planetary gear stages configured to be driven by the at least one first electrical machine, wherein the exactly two planetary gear stages comprises a first planetary gear stage and a second planetary gear stage; and
exactly two spur gear stages, wherein the exactly two spur gear stages comprises a first spur gear stage and a second spur gear stage, wherein the first spur gear stage is configured to be driven by the at least one first electrical machine, wherein first spur gear stage includes a first spur gear and a second spur gear meshing with the first spur gear;

at least one drive wheel of the motor vehicle, the at least one drive wheel is rotatable around a wheel axis of rotation running parallel to the machine axis of rotation and is configured to be driven by the at least one first electrical machine via the gear unit;
an axle drive configured to be driven by the at least one first electrical machine via the gear unit, wherein the at least one drive wheel is drivable by the at least one first electrical machine via the axle drive; and
a braking element, configured so that a gear element of the first planetary gear stage or a gear element of the second planetary gear stage is fixable to a housing of the gear unit, wherein the braking element has an internal gear that is displaceable in a axial direction of the secondary planetary gear stage relative to the housing,
wherein the at least one first electrical machine is arranged at least partially on a first side of a longitudinal central plane with respect to a longitudinal central plane of the motor vehicle that is spanned by a vehicle vertical direction and a vehicle longitudinal direction,
wherein the first spur gear stage is arranged on a second side of the longitudinal central plane opposite the first side in a vehicle transverse direction, and
wherein, in relation to a torque flow from the at least one first electrical machine to the at least one drive wheel, the first planetary gear stage is arranged after the at least one first electrical machine and before the at least one dri

Assignees

• Daimler Ag

Inventors

• Krajewski Christian
• Niebauer Guenter
• Vincon Florian

Classifications

• B60K17/12

  of electric gearing · CPC title

• B60K2001/001

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

• B60K2023/046

  Axle differential locking means · CPC title

• B60Y2400/73

  Planetary gearings · CPC title

• B60K17/16

  of differential gearing · CPC title