Motor vehicle drive device

Patent metadata

Field	Value
Publication number	US-11198358-B2
Application number	US-201917260651-A
Country	US
Kind code	B2
Filing date	Sep 24, 2019
Priority date	Oct 4, 2018
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

A motor vehicle drive apparatus includes a device configured to connect an internal combustion engine to an electromechanical energy converter, and first and second drive trains. The second drivetrain is arranged parallel to the first drivetrain in relation to torque transmission between the electromechanical energy converter and the internal combustion engine. The first drivetrain has a one-way clutch which is set up in such a manner that torque is transmittable via the first drivetrain from the electromechanical energy converter to the internal combustion engine during starting of the internal combustion engine. The second drivetrain has a speed-sensitive clutch which in a first state is open until a first speed threshold is reached, so that in the first state no torque is transmittable with the second drivetrain from the internal combustion engine to the electromechanical energy converter. The speed-sensitive clutch is closed from the crossing of this first speed threshold.

First claim

What is claimed is:

1. A motor vehicle drive apparatus comprising:
a device configured to connect an internal combustion engine to an electromechanical energy converter, wherein the electromechanical energy converter is configured to start the internal combustion engine, and to a starter generator transmission having a first drivetrain which is configured to conduct torque from the electromechanical energy converter to the internal combustion engine during starting of the internal combustion engine, and wherein the starter generator transmission has a step-down ratio in the direction from the electromechanical energy converter to the internal combustion engine and the starter generator transmission also has a second drivetrain which is configured to at least temporary conduct a torque in a direction from the internal combustion engine to the electromechanical energy converter, wherein
the second drivetrain is arranged parallel to the first drivetrain in relation to torque transmission between the electromechanical energy converter and the internal combustion engine,
the first drivetrain has a one-way clutch which is set up in such a manner that torque is transmittable via the first drivetrain from the electromechanical energy converter to the internal combustion engine during starting of the internal combustion engine,

the second drivetrain has a speed-sensitive clutch which in a first state is open until a first speed threshold is reached, so that in the first state no torque is transmittable with the second drivetrain from the internal combustion engine to the electromechanical energy converter, and
the speed-sensitive clutch is closed from the crossing of this first speed threshold.

2. The motor vehicle drive apparatus according to claim 1 , wherein the speed-sensitive clutch is a centrifugal clutch.

3. The motor vehicle drive apparatus according to claim 2 , wherein the one-way clutch is a freewheel clutch.

4. The motor vehicle drive apparatus according to claim 3 , wherein the starter generator transmission has a ratio in a direction from the electromechanical energy converter to the internal combustion engine of between 1:6 and 1:2.

5. The motor vehicle drive apparatus according to claim 4 , wherein the first speed threshold is greater than 0.75 times an idle speed of the internal combustion engine and smaller than 1.05 times the idle speed.

6. The motor vehicle drive apparatus according to claim 5 , wherein the starter generator transmission has an epicyclic gear train or is formed from an epicyclic gear train.

7. A motor vehicle drive system comprising:
the motor vehicle drive apparatus according to claim 6 , wherein the internal combustion engine and the electromechanical energy converter are connected to the motor vehicle drive apparatus.

8. The motor vehicle drive system according to claim 7 , wherein the starter generator transmission and at least the internal combustion engine or the starter generator transmission and at least the electromechanical energy converter share a common oil supply.

9. A motor vehicle having a motor vehicle drive system according to claim 8 .

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Koetzinger Georg

Classifications

• B60K2006/268

  Electric drive motor starts the engine, i.e. used as starter motor · CPC title

• B60K6/26

  characterised by the motors or the generators · CPC title

• B60K6/48

  Parallel type · CPC title

• B60K6/485 Primary

  Motor-assist type · CPC title

• F16D45/00

  Freewheels or freewheel clutches combined with automatic clutches · CPC title