Hybrid powertrain and assembly method for a hybrid powertrain

Patent metadata

Field	Value
Publication number	US-11993151-B2
Application number	US-201917284564-A
Country	US
Kind code	B2
Filing date	Oct 14, 2019
Priority date	Nov 6, 2018
Publication date	May 28, 2024
Grant date	May 28, 2024

Abstract

A hybrid powertrain includes an output shaft, a combustion power section for providing a first torque, an electric power section for providing a second torque, and an output transmission for transmitting the first torque between the combustion power section and the output shaft and transmitting the second torque between the electric power section and the output shaft. The combustion power section includes an internal combustion engine with a combustion shaft for outputting the first torque, a generator with a generator shaft for converting the first torque into electric energy, and a variable belt transmission for variably translating the first torque. The belt transmission includes a combustion-side cone pulley pair with a first axially movable pulley arranged on a generator shaft side, an output-side cone pulley pair with a second axially movable pulley, and a belt for variably torque-transmittingly connecting the combustion-side cone pulley pair to the output-side cone pulley pair.

First claim

The invention claimed is:

1. A hybrid powertrain comprising:
an output shaft;
a combustion power section for providing a first torque to the output shaft, comprising:
an internal combustion engine comprising a combustion shaft for outputting the first torque;
a generator comprising a generator shaft for converting the first torque into electric energy; and
a variable belt transmission for variably translating the first torque, comprising:
a combustion-side cone pulley pair comprising a first axially movable pulley, arranged on a generator shaft side, for changing a transmission ratio of the variable belt transmission;
an output-side cone pulley pair comprising a second axially movable pulley, axially opposite the first axially movable pulley, for changing the transmission ratio of the variable belt transmission; and
a belt for variably torque-transmittingly connecting the combustion-side cone pulley pair to the output-side cone pulley pair;

an electric power section for providing a second torque to the output shaft; and
an output transmission torque transmittingly connected to the output shaft for:
transmitting the first torque between the combustion power section and the output shaft; and
transmitting the second torque between the electric power section and the output shaft, wherein:

the output transmission comprises a reduction stage; and
the reduction stage is a planetary roller gear, the planetary roller gear comprising:
a ring gear arranged as a rigid torque abutment;
a planetary carrier torque-transmittingly connected to the output shaft; and
a sun gear arranged as a torque input on a hollow shaft surrounding the output shaft.

2. The hybrid powertrain of claim 1 further comprising a rigid combustion transmission, wherein:
the combustion shaft and the generator shaft extend in a same axial direction;
the combustion shaft is torque-transmittingly connected to a first input side of the combustion-side cone pulley pair by the rigid combustion transmission; and
the generator shaft is torque-transmittingly connected to a second input side of the combustion-side cone pulley pair, axially opposite the first input side.

3. The hybrid powertrain of claim 1 further comprising:
a first separating clutch disposed between the combustion shaft and the variable belt transmission for switchably separating torque transmission between the internal combustion engine and the output shaft; or
a second separating clutch disposed between the variable belt transmission and the output shaft for switchably separating torque transmission between the combustion power section and the output shaft.

4. The hybrid powertrain of claim 1 further comprising:
a single cylinder for actuating the first axially movably pulley; and
a tandem cylinder for actuating the second axially movable pulley.

5. The hybrid powertrain of claim 1 further comprising:
a rigid generator transmission torque-transmittingly connecting the generator shaft to the combustion-side cone pulley pair, the rigid generator transmission comprising a first generator gear arranged on the generator shaft;
a generator-side support bearing for rotatably supporting a first axial side of the first generator gear;
an outer support bearing for rotatably supporting a second axial side of the first generator gear, opposite the first axial side; and
a bearing bracket holding the outer support bearing.

6. The hybrid powertrain of claim 5 , wherein:
the bearing bracket is a separate component from the generator; and
the combustion power section further comprises a housing component; and
the bearing bracket is fastened to the housing component.

7. The hybrid powertrain of claim 1 further comprising a pilot bearing for rotatably supporting the output-side cone pulley pair on the generator shaft side.

8. The hybrid powertrain of claim 7 further comprising a pin, wherein:
the pilot bearing is supported on the pin; and
the output transmission comprises an electric receiving gear.

9. The hybrid powertrain of claim 8 further comprising:
a first disk and second disk; wherein:
the pin is arranged on the first disk;
the first disk is connected to the second disk; and
the output transmission comprises a first rotary bearing received by the second disk; or
the output shaft comprises a third rotary bearing received by the second disk.

10. The hybrid powertrain of claim 1 , wherein:
the output transmission comprises a first rotary bearing and a second rotary bearing;
the output shaft comprises a third rotary bearing;
the planetary carrier is supported on a first axial side by the first rotary bearing and on a second axial side, opposite the first axial side, by the second rotary bearing;
the sun gear is supported by the third rotary bearing; and
the third rotary bearing axially overlaps a one of the first rotary bearing or the second rotary bearing.

11. The hybrid powertrain of claim 10 , wherein the third rotary bearing and the one of the first rotary bearing or the second rotary bearing are held in a common housing part.

12. The hybrid powertrain of claim 1 further comprising:
an upper machine housing comprising a combustion connection;
a combustion shaft bearing installed in the upper machine housing;
a damper housing connected to the combustion connection;
a rigid combustion transmission torque-transmittingly connecting the combustion shaft to a first input side of the combustion-side cone pulley pair;
a torsional vibration damper installed in the damper housing and connected to the combustion shaft, the rigid combustion transmission, and the first input side;
a primary stage housing that axially closes off the damper housing;
a lower machine housing, the output-side cone pulley pair being installed in the lower machine housing;
a rigid generator transmission torque-transmittingly connecting the generator shaft to the combustion-side cone pulley pair, the rigid generator transmission comprising a first generator gear arranged on the generator shaft;
a generator-side support bearing for rotatably supporting a first axial side of the first generator gear; and
a generator transmission housing, the output transmission and the generator-side support bearing being installed in the generator transmission housing.

13. The hybrid powertrain of claim 12 wherein the combustion-side cone pulley pair is installed in the upper machine housing.

14. The hybrid powertrain of claim 12 further comprising a first separating clutch connected to the torsional vibration damper.

15. The hybrid powertrain of claim 12 wherein the primary stage housing comprises a through opening for a shaft nut for the rigid combustion transmission.

16. The hybrid powertrain of claim 12 wherein the output shaft is installed in the lower machine housing.

17. The hybrid powertrain of claim 12 wherein the upper machine housing, the damper housing, the primary stage housing, the lower machine housing, and the generator transmission housing are configured as a single housing.

18. A method for assembling the hybrid powertrain of claim 12 , comprising:
preassembling the internal combustion engine to the upper machine housing and in the lower machine housing, the upper machine housing and the lower machine housing forming a housing tunnel;
mounting the variable belt transmission and the rigid combustion transmission in the damper housing, and connecting a first separating clutch to the first input side of the combustion-side cone pulley pair;
introducing the variable belt transmission

Assignees

• Schaeffler Technologies Ag

Inventors

• Köpfler Sebastian
• Walter Bernhard

Classifications

• B60K6/442 Primary

  Series-parallel switching type · CPC title

• B60K6/365

  with the gears having orbital motion · CPC title

• B60K6/387

  Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means · CPC title

• B60K6/40 Primary

  characterised by the assembly or relative disposition of components · CPC title

• B60K6/543

  the transmission being a continuously variable transmission · CPC title