Cvt drive train

Patent metadata

Field	Value
Publication number	US-2016347165-A1
Application number	US-201415112961-A
Country	US
Kind code	A1
Filing date	Dec 15, 2014
Priority date	Jan 21, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

A CVT drive train including a continuously adjustable variator and having a transmission input shaft situated on a primary drive side of the drive train and operatively connected with a primary drive source that is an internal combustion engine. A start-up device and a secondary drive source that includes an electrical machine are disposed co-axially. A first additional clutch serves to couple the secondary drive source to a direct drive stage, and a second additional clutch serves to couple the secondary drive to the variator input.

First claim

What is claimed is:

1 . A CVT drive train, said drive train comprising:
a primary drive source. a continuously adjustable variator having a variator input and a variator output, and operatively connected to the primary drive source and to a transmission input shaft, a start-up device including a startup clutch connected between the primary drive source and the variator, a secondary drive source disposed coaxially with the transmission input shaft and arranged between the primary drive source and the variator, a first additional clutch for coupling the secondary drive source to a direct drive stage, and a second additional clutch for coupling the secondary drive source to a variator input.

2 . A CVT drive train according to claim 1 , wherein the first and second additional clutches are situated upstream of the variator input.

3 . A CVT drive train according to claim 1 , wherein the first and second additional clutches are positive-lock clutches.

4 . A CVT drive train according to claim 1 , wherein the start-up device is positioned on a primary drive side between the second additional clutch and a torsional vibration damper.

5 . A CVT drive train according to claim 1 , wherein the second additional clutch is positioned radially inside the secondary drive.

6 . A CVT drive train according to claim 1 , wherein a third additional clutch is positioned on an output side and is connected to the variator output.

7 . A CVT drive train according to claim 1 , wherein a direct drive stage of the drive train includes a changeover gear for a dual-range CVT that operates through the secondary drive.

8 . A CVT drive train according to claim 1 , wherein the secondary drive is coupled directly to an auxiliary power takeoff.

9 . A method for operating a CVT drive train having the components claimed in claim 1 , said method comprising the steps of:
a. providing propulsive power to an output drive from the primary drive source through the variator with the variator operating in a first variator operating range, b. adjusting the variator to operate in a second operating range different from the first operating range, and c. disconnecting the primary power source from the drive train and providing propulsive power to the output drive through the variator from the secondary power source.

10 . A method according to claim 9 , including the step of utilizing the secondary drive for propulsion during a direct drive stage shift when changing over between different operating ranges of a multi-range variator to avoid an unwanted interruption of propulsive power.

Assignees

• Schaeffler Technologies Ag

Inventors

• Walter Bernhard

Classifications

• F16H37/022

  the toothed gearing having orbital motion · CPC title

• Y10S903/918

  Continuously variable · CPC title

• B60K2006/4808

  Electric machine connected or connectable to gearbox output shaft · CPC title

• B60K6/48

  Parallel type · CPC title

• B60K6/543 Primary

  the transmission being a continuously variable transmission · CPC title