Torque transmission device

Abstract

A torque transmission device is disclosed that comprises a torque converter and a vibration damping device arranged outside the torque converter housing. The torque converter includes an impeller, a turbine wheel, and a stator. The torque transmission device further includes a power split device disposed inside the torque converter housing and connected to a lock-up clutch and the turbine wheel.

Claims

1. A torque transmission device, comprising: a torque converter including a housing and an impeller, a turbine wheel, and a stator disposed within the housing of the torque converter; a power split device disposed within the housing of the torque converter and connected to a lock-up clutch and the turbine wheel, wherein the power split device is configured as a planetary gear mechanism; and a vibration damping device arranged outside the housing of the torque converter, wherein a stator stub of the torque converter is connected to a sun gear of the planetary gear mechanism and the vibration damping device.

2. The torque transmission device of claim 1, wherein the vibration damping device is arranged on a transmission side of the torque transmission device.

3. The torque transmission device of claim 1, wherein the vibration damping device is supported on a transmission housing.

4. The torque transmission device of claim 3, wherein the vibration damping device is configured to have a spring rate that can be changed.

5. The torque transmission device of claim 4, wherein the spring rate of the vibration damping device is configured to be set in such a way that vibrations of a first power branch of the power split device interfere with vibrations of a second power branch in a destructive manner.

6. The torque transmission device of claim 1, wherein the sun gear or the vibration damping device is connected directly to the stator stub or to a stator freewheel inner ring.

7. The torque transmission device of claim 1, wherein a planetary carrier of the planetary gear mechanism is connected to a transmission input shaft.

8. The torque transmission device of claim 1, wherein an internal gear of the planetary gear mechanism is connected to an output of the lock-up clutch.

9. The torque transmission device of claim 8, wherein the turbine wheel and an input of the lock-up clutch is connected to a drive.

10. A torque transmission device, comprising: a torque converter including a housing and an impeller, a turbine wheel, and a stator disposed within the housing of the torque converter; a power split device disposed within the housing of the torque converter and connected to a lock-up clutch and the turbine wheel, wherein the power split device is configured to split a torque into a first power branch and second power branch; and a vibration damping device arranged outside the housing of the torque converter, the vibration damping device being coupled to the first power branch and configured to dampen vibrations in the first power branch, wherein a spring rate of the vibration damping device is changed such that a superimposition of vibrations damped in the first power branch with vibrations in the second power branch results in an elimination of vibrations forwarded into a transmission input shaft.

11. The torque transmission device of claim 10, wherein the power split device is configured as a planetary gear mechanism, the first power branch is arranged to run through the stator and a sun gear of the planetary gear mechanism, and the second power branch is arranged to run through the impeller or lock-up clutch via an internal gear of the planetary gear mechanism.

12. The torque transmission device of claim 10, wherein the vibration damping device is supported on and connected to a transmission housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a torque transmission device according to the present disclosure.

DETAILED DESCRIPTION

(2) The single FIGURE shows a torque transmission device 1, comprising a vibration damping device 2 and a torque converter 3 with an impeller 4, a turbine wheel 5 and a stator 6. Furthermore, the torque transmission device 1 is assigned a transmission input shaft 7 and a power split device 8.

(3) The power split device 8 comprises an internal gear 9 which is coupled or connected to a lock-up clutch 10 and the turbine wheel 5. Furthermore, the power split device 8 has a plurality of planets 12 which are supported by a planetary carrier 11 and mesh firstly with the internal gear 9 and secondly with a sun gear 13. The planetary carrier 11 is connected to the transmission input shaft 7. The sun gear 13 is arranged at one end of a stator shaft 14, the stator shaft 14 being coupled at its end which lies opposite the sun gear 13 to the vibration damping device 2. The vibration damping device 2 is configured, for example, as a torsional damper. It can be seen that the vibration damping device 2 is connected by way of one side 15 to the stator shaft 14 and by way of the other side 16 to a transmission housing 17. The vibration damping device 2 is accordingly arranged outside a housing 18 of the torque converter 3.

(4) A torque which is introduced via a drive 19 into the torque transmission device 1 is transmitted via the impeller 4 to the turbine wheel 5. By way of the power split, the torque in the first power branch is transmitted to the internal gear 9 via the turbine wheel 5 which is coupled to the internal gear 9, and the torque in the other power branch is transmitted to the stator shaft 14 via the stator 6, via a stator stub 20. The two power branches are accordingly combined in the power split device 8 which, as can be seen, is configured as a planetary gear mechanism, since the planets 12 mesh both with the internal gear 9 and with the sun gear 13. If the lock-up clutch 10 is closed, the torque which is introduced by the drive 19 is introduced via the lock-up clutch 10 into the internal gear 9.

(5) As a consequence, this results in two power branches, the one power branch which leads via the stator 6 or the stator stub 20 being damped by means of the vibration damping device 2. The two power branches are combined in the power split device 8, with the result that the vibrations which occur in the individual power branches are superimposed. Accordingly, a suitable selection or design of the vibration damping device 2 can achieve a situation, in particular, where the vibrations which occur in the one power branch can be superimposed in a destructive manner with the vibrations which occur in the other power branch. To this end, the vibration damping device 2 can be changed, in particular, by means of an actuator (not shown) in such a way that the spring rate or the characteristic can be set, with the result that the vibrations which occur in the damped power branch vibrate with anti-resonance with respect to the vibrations of the non-damped power branch and can therefore be superimposed in a destructive manner with the latter. As a result, the vibrations which are ultimately introduced into the transmission input shaft 7 can be virtually equalized on account of the anti-resonance.

LIST OF REFERENCE NUMBERS

(6) 1 Torque transmission device

(7) 2 Vibration damping device

(8) 3 Torque converter

(9) 4 Impeller

(10) 5 Turbine wheel

(11) 6 Stator

(12) 7 Transmission input shaft

(13) 8 Power split device

(14) 9 Internal gear

(15) 10 Lock-up clutch

(16) 11 Planetary carrier

(17) 12 Planets

(18) 13 Sun gear

(19) 14 Stator shaft

(20) 15 Side

(21) 16 Side

(22) 17 Transmission housing

(23) 18 Housing

(24) 19 Drive

(25) 20 Stator stub