Transmission having a torque vectoring superposition unit

Patent metadata

Field	Value
Publication number	US-11618318-B2
Application number	US-202017621364-A
Country	US
Kind code	B2
Filing date	Mar 5, 2020
Priority date	Jun 28, 2019
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

A transmission having an input and first and second output shafts and first and second planetary gear sets. Torque introduced via the input shaft is distributed to the two output shafts in a defined ratio. An element of the first planetary gear set is connected to another element of the second planetary gear set and an element of the second planetary gear set is secured to a rotationally fixed component. A torque vectoring superposition unit has a third planetary gear set. A first element of the third planetary gear set is rotationally fixed to a linking shaft. A second element of the third planetary gear set is connected to a machine rotor. A third element of the third planetary gear set is rotationally fixed to an element of the second planetary gear set, which is fixed to the first output shaft.

First claim

The invention claimed is:

1. A transmission having a torque vectoring superposition unit, comprising:
an input shaft;
a first output shaft;
a second output shaft;
a first planetary gear set; and
a second planetary gear set connected to the first planetary gear set,
wherein the first planetary gear set and the second planetary gear set each comprise multiple elements,
wherein the input shaft, the first and second output shafts, the planetary gear sets, and elements thereof are arranged and are configured such that:
a torque introduced via the input shaft is converted and divided between the two output shafts in a defined ratio, and a generation of a sum torque is prevented,
wherein at least one element of the first planetary gear set is connected rotationally conjointly to another element of the second planetary gear set via a connecting shaft; and
a further element of the second planetary gear set is fixed to a non-rotatable structural element;

the torque vectoring superposition unit comprising a third planetary gear set and an actuator, wherein:
a first element of the third planetary gear set is connected rotationally conjointly to the connecting shaft, a second element of the third planetary gear set is connected to the actuator, and a third element of the third planetary gear set is connected rotationally conjointly to a second element of the first planetary gear set, which in turn is connected rotationally conjointly to the first output shaft.

2. The transmission as claimed in claim 1 , wherein the actuator is an electric motor or a hydraulic motor.

3. The transmission as claimed in claim 1 , wherein the third planetary gear set is arranged axially adjacent to the first planetary gear set.

4. The transmission as claimed in claim 1 , wherein the third planetary gear set is arranged radially outside the first planetary gear set.

5. The transmission as claimed in claim 1 , wherein the third planetary gear set is a minus planetary gear set.

6. The transmission as claimed in claim 1 , wherein the third planetary gear set is a plus planetary gear set.

7. The transmission as claimed in claim 1 , wherein the third planetary gear set is a stepped-planet construction.

8. The transmission as claimed in claim 1 , wherein, to apply a speed ratio to a rotational speed of the actuator, at least one transmission gearing is arranged between the second element of the third planetary gear set and the actuator.

9. The transmission as claimed in claim 8 , wherein, to apply a speed ratio to an actuator rotational speed, two transmission gearings are arranged between the second element of the third planetary gear set and the actuator.

10. A drivetrain having a transmission having a torque vectoring superposition unit, comprising:
an input shaft;
a first output shaft;
a second output shaft;
a first planetary gear set; and
a second planetary gear set connected to the first planetary gear set,
wherein the first planetary gear set and the second planetary gear set each comprise multiple elements,
wherein the input shaft, the first and second output shafts, the planetary gear sets, and elements thereof are arranged and are configured such that:
a torque introduced via the input shaft is converted and divided between the two output shafts in a defined ratio, and a generation of a sum torque is prevented,
wherein at least one element of the first planetary gear set is connected rotationally conjointly to another element of the second planetary gear set via a connecting shaft; and
a further element of the second planetary gear set is fixed to a non-rotatable structural element;

the torque vectoring superposition unit comprising a third planetary gear set and an actuator, wherein:
a first element of the third planetary gear set is connected rotationally conjointly to the connecting shaft, a second element of the third planetary gear set is connected to the actuator, and a third element of the third planetary gear set is connected rotationally conjointly to a second element of the first planetary gear set, which in turn is connected rotationally conjointly to the first output shaft.

11. A vehicle having a transmission having a torque vectoring superposition unit, comprising:
an input shaft;
a first output shaft;
a second output shaft;
a first planetary gear set; and
a second planetary gear set connected to the first planetary gear set,
wherein the first planetary gear set and the second planetary gear set each comprise multiple elements,
wherein the input shaft, the first and second output shafts, the planetary gear sets, and elements thereof are arranged and are configured such that:
a torque introduced via the input shaft is converted and divided between the two output shafts in a defined ratio, and a generation of a sum torque is prevented,
wherein at least one element of the first planetary gear set is connected rotationally conjointly to another element of the second planetary gear set via a connecting shaft; and
a further element of the second planetary gear set is fixed to a non-rotatable structural element;

the torque vectoring superposition unit comprising a third planetary gear set and an actuator, wherein:
a first element of the third planetary gear set is connected rotationally conjointly to the connecting shaft, a second element of the third planetary gear set is connected to the actuator, and a third element of the third planetary gear set is connected rotationally conjointly to a second element of the first planetary gear set, which in turn is connected rotationally conjointly to the first output shaft.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Beck Stefan
• Reisch Matthias

Classifications

• B60K2023/043

  Control means for varying left-right torque distribution, e.g. torque vectoring · CPC title

• F16H48/10 Primary

  with orbital spur gears · CPC title

• B60K2001/001

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

• B60Y2400/73

  Planetary gearings · CPC title

• F16H2048/364

  using electric or hydraulic motors · CPC title