CVT drive train

Patent metadata

Field	Value
Publication number	US-10995837-B2
Application number	US-201716332001-A
Country	US
Kind code	B2
Filing date	Nov 14, 2017
Priority date	Nov 21, 2016
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A CVT drive train includes a gearbox input shaft, a secondary drive, a differential, and a continuously adjustable variator. The gearbox input shaft is arranged on a motor side. The secondary drive has a starting device and an electric motor, both arranged coaxially to the gearbox input shaft. The electric motor has a stator, and a rotor arranged radially inside of the stator. The differential has a differential output gear. The continuously adjustable variator has a drive-side disc set, and an output-side disc set coupled to the differential and arranged directly adjacent to the differential output gear in a plan view. The drive-side disc set has a drive-side adjustable disc, and a drive-side fixed disc facing away from the motor side. The output-side disc set has an output-side fixed disc, and an output-side adjustable disc facing away from the motor side.

First claim

The invention claimed is:

1. A continuously variable transmission (CVT) drive train comprising:
a gearbox input shaft arranged on a motor side;
a secondary drive comprising:
a starting device arranged coaxially to the gearbox input shaft; and,
an electric motor arranged coaxially to the gearbox input shaft and comprising:
a stator; and,
a rotor arranged radially inside of the stator;

a differential comprising a differential output gear; and,
a continuously adjustable variator comprising:
a drive-side disc set comprising:
a drive-side adjustable disc; and,
a drive-side fixed disc located further away from the motor side than the drive-side adjustable disc; and,

an output-side disc set, rotatable about a rotation axis, coupled to the differential and arranged directly adjacent to the differential output gear such that a portion of the drive-side disc set at least partially overlaps the differential output gear when viewed in a direction of the rotation axis, the output-side disc set comprising:
an output-side fixed disc; and,
an output-side adjustable disc located further away from the motor side than the drive-side adjustable disc.

2. The CVT drive train of claim 1 , wherein the drive-side disc set comprises a main bearing arranged radially inside of and axially overlapping the electric motor.

3. The CVT drive train of claim 1 further comprising a rotor carrier, wherein:
the drive-side disc set comprises a variator drive shaft; and,
the rotor is supported on the variator drive shaft by the rotor carrier.

4. The CVT drive train of claim 3 wherein:
the rotor carrier is fixedly connected to the gearbox input shaft; and,
the gearbox input shaft is connected to the variator drive shaft by:
a push-fit toothing; and,
a centering seat or a press fit.

5. The CVT drive train of claim 1 further comprising:
a housing;
a variator output gear;
an intermediate shaft;
a connecting gear on the intermediate shaft between the variator output gear and the differential; and,
an intermediate shaft bearing for the intermediate shaft comprising:
a bearing plate fixed to the housing; and,
a bearing journal integrally connected to the bearing plate.

6. The CVT drive train of claim 1 , further comprising a planetary gear set for forming a reverse gear arranged radially inside of and axially overlapping the electric motor.

7. The CVT drive train of claim 6 further comprising:
a braking device for the planetary gear set; and,
a device for detecting a circumferential position or a rotation speed arranged radially inside of the electric motor between the starting device and the braking device.

8. The CVT drive train of claim 1 further comprising a clutch arranged radially inside of and axially overlapping the electric motor.

Assignees

• Schaeffler Technologies Ag

Inventors

• Walter Bernhard

Classifications

• F16H61/66259

  using electrical or electronical sensing or control means · CPC title

• F16H37/0846 Primary

  CVT using endless flexible members · CPC title

• F16H2037/088

  Power-split transmissions with summing differentials, with the input of the CVT connected or connectable to the input shaft · CPC title

• F16H2037/026

  Layouts with particular features of reversing gear, e.g. to achieve compact arrangement · CPC title

• F16H61/6625

  controlling shifting exclusively as a function of torque · CPC title