Toroidal transmission

• US 20070149342A1
• Filed: 10/27/2006
• Published: 06/28/2007
• Est. Priority Date: 04/30/2004
• Status: Active Grant

• Current Assignee: Getrag Getriebe- und Zahnradfabrik Hermann Hagenmeyer GmbH & CIE KG
• Original Assignee: Getrag Getriebe- und Zahnradfabrik Hermann Hagenmeyer GmbH & CIE KG
• Inventors: Wolf, Walter, Guenter, Ruehle
• Granted Patent: US 7,347,801 B2
• Time in Patent Office: Days
• US Class Current: 475/214
• CPC Class Codes: B60K 17/348 having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed B60K17/346 takes precedence
• CPC Class Codes: F16H 2037/0886 with switching means, e.g. to change ranges
• CPC Class Codes: F16H 37/0813 with only one input shaft differentials for four wheel drive vehicles B60K17/346
• CPC Class Codes: F16H 37/086 CVT using two coaxial friction members cooperating with at least one intermediate friction member

Abstract

A toroidal transmission, especially for motor vehicles, comprising an input shaft which can be connected to an engine, a first toroidal variator and a second toroidal variator which are connected to the input shaft on the input side. A first output shaft can be connected to the output of the first toroidal variator, and a second output shaft can be connected to the output of the second toroidal variator. The toroidal transmission comprises a first power range shifting means for the first toroidal variator and a second power range shifting means for the second toroidal variator. The first power range shifting means and the second power range shifting means have a common clutch.

Claims

1. A toroidal transmission, especially for motor vehicles, comprising an input shaft which can be connected to an engine, a first toroidal variator and a second toroidal variator which are connected to the input shaft on the input side, a first output shaft which can be connected to the output of the first toroidal variator, and a second output shaft which can be connected to the output of the second toroidal variator, wherein the toroidal transmission comprises a first power range shifting means for the first toroidal variator and a second power range shifting means for the second toroidal variator, wherein the first power range shifting means and the second power range shifting means have a common clutch.

2. The toroidal transmission as claimed in claim 1, wherein the common clutch is a low-range clutch, which is capable of connecting the input shaft to an input of a first summing gear set of the first power range shifting means and to an input of a second summing gear set of the second power range shifting means, or separating it therefrom.

3. The toroidal transmission as claimed in claim 2, wherein an output of the first summing gear set is or can be connected to the first output shaft and wherein an output of the second summing gear set is or can be connected to the second output shaft.

4. The toroidal transmission as claimed in claim 2, wherein the first summing gear set and the second summing gear set each have a planetary gear train.

5. The toroidal transmission as claimed in claim 4, wherein the planetary gear trains are coupled together by a common element.

6. The toroidal transmission as claimed in claim 5, wherein the common element is a common planet carrier.

7. The toroidal transmission as claimed in claim 4, wherein the outputs of the first toroidal variator and the second toroidal variator are connected to the sun gear of the first planetary gear train and the second planetary gear train, respectively.

8. The toroidal transmission as claimed in claim 4, wherein the internal gears of the planetary gear trains are or can be connected to the first output shaft and the second output shaft, respectively.

9. The toroidal transmission as claimed in claim 1, wherein the first power range shifting means and the second power range shifting means each have a high-range clutch, which is capable of connecting the output of the first toroidal variator and the second toroidal variator respectively to the associated output shaft or separating it therefrom.

10. The toroidal transmission as claimed in claim 1, wherein variator bypass means are provided, which bypass the toroidal variators.

11. The toroidal transmission as claimed in claim 1, wherein a locking clutch is provided between the outputs of the first toroidal variator and the second toroidal variator.