Hybrid module for a drive train of a motor vehicle

Abstract

A compact hybrid module includes a separating clutch with a reliably controlled actuation pressure. The hybrid module is provided with a disengagement device having a pressure pot for the transmission of force from a disengagement bearing to a pressure plate of the separating clutch or K0 separating clutch. The separating clutch itself can be actuated via the pressure pot without an additional lever ratio. Owing to a low level of hysteresis as a result of the direct actuation, the clutch can then be precisely regulated in terms of pressure.

Claims

1. A hybrid module for a drivetrain of a motor vehicle comprising: a rotor element arranged to be driven by an electric machine; a separating clutch arranged within the rotor element; a disengagement device for actuating the separating clutch; and a leaf spring, wherein: the separating clutch includes a pressure plate; the disengagement device includes a piston, a disengagement bearing and a pressure pot; the piston is for transmitting a force to the disengagement bearing; the disengagement bearing includes a roller element entirely radially inside of the piston; the pressure pot is for transmitting the force from the disengagement bearing to the pressure plate without a lever action; the rotor element includes a rotor web; and the leaf spring connects the pressure plate to the rotor web.

2. The hybrid module of claim 1, wherein a piston guide length is less than 0.4 times a mean piston diameter.

3. The hybrid module of claim 2, wherein the piston is a part of a concentric slave cylinder unit.

4. The hybrid module of claim 1, wherein the disengagement device and the separating clutch are arranged axially one behind the other.

5. The hybrid module of claim 1, wherein the pressure pot and the pressure plate are integrally connected.

6. A drivetrain for a motor vehicle comprising: the electric machine; an internal combustion engine; a transmission; and, the hybrid module of claim 1.

7. The drivetrain of claim 6, further comprising a dual clutch including at least one clutch connected downstream of the electric machine.

8. The drivetrain of claim 6, further comprising a starting clutch with a counter plate rotationally connected to the rotor element.

9. The drivetrain of claim 8 wherein the counter plate and the rotor element are directly connected.

10. The drivetrain of claim 8 wherein the counter plate and the rotor element are indirectly connected via an intermediate element.

11. A hybrid module for a drivetrain of a motor vehicle comprising: a rotor element arranged to be driven by an electric machine; a separating clutch arranged within the rotor element; and, a disengagement device for actuating the separating clutch, wherein: the separating clutch includes a pressure plate; the disengagement device includes a disengagement bearing, a piston and a pressure pot; the pressure pot is for transmitting a force from the disengagement bearing to the pressure plate without a lever action; the piston comprises a variable guide length that increases when the piston is retracted and decreases when the piston is extended, and a mean piston diameter; and the variable guide length is less than 0.4 times the mean piston diameter when the piston is retracted.

12. The hybrid module of claim 11 wherein the piston is a component of a concentric slave cylinder unit.

13. The hybrid module of claim 11 wherein the disengagement device and the separating clutch are arranged axially behind one another.

14. The hybrid module of claim 11, further comprising a leaf spring element, wherein the rotor element comprises a rotor web and the leaf spring connects the pressure plate to the rotor web.

15. The hybrid module of claim 11, wherein the pressure pot and the pressure plate are integrally connected.

16. A drivetrain for a motor vehicle comprising: the electric machine; an internal combustion engine; a transmission; and, the hybrid module of claim 11.

17. The drivetrain of claim 16, further comprising a dual clutch including at least one clutch connected downstream of the electric machine.

18. The drivetrain of claim 16, further comprising a starting clutch with a counter plate rotationally connected to the rotor element.

19. The drivetrain of claim 18 wherein the counter plate and the rotor element are directly connected.

20. The drivetrain of claim 18 wherein the counter plate and the rotor element are indirectly connected via an intermediate element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Embodiments, to which said disclosure is however not restricted and from which further features according to the disclosure can emerge, are shown in the following figures.

(2) In the figures:

(3) FIG. 1 shows a hybrid module according to a first embodiment, and

(4) FIG. 2 shows a hybrid module according to a second embodiment.

(5) FIG. 3 shows a detail view of FIG. 1.

DETAILED DESCRIPTION

(6) FIG. 1 shows a part of a drivetrain 10 of a motor vehicle in a sectional illustration. In the drivetrain 10, an electric machine 12 is arranged between an internal combustion engine (not shown) and a transmission (likewise not shown). The electric machine 12 serves as drive machine and is part of a hybrid module 14. Said hybrid module 14 has the following main components: (i) a functional unit 16 having a rotor element 18 formed as a rotor of the electric machine 12, having a separating clutch 20 arranged within the rotor element 18 and having at least one clutch part 22, which is connected rotationally conjointly to the rotor element 18, of a clutch device 24, (ii) a housing unit 28 which partially accommodates the functional unit 16 and a stator 26 of the electric machine 12, (iii) a dual-mass flywheel 30 which is connected upstream of the separating clutch 20 in the drivetrain 10, and (iv) a housing part 32, which accommodates the clutch device 24, of the transmission. The clutch device 24 is formed as a dual clutch 34. Accordingly, the transmission is formed as a dual-clutch transmission, of which only the two transmission input shafts 36, 38 are illustrated.

(7) The following path of the drivetrain is realized: Output shaft 40 of the internal combustion enginedual-mass flywheel 30separating clutch 20rotor element 18 of the electric machine 12 formed as an internal-rotor machineclutch device 24transmission input shaft 36, 38. Here, the corresponding shafts 36, 38, 40 lie on a common axis 42, which forms the main axis of the hybrid module 14.

(8) The clutch device 24, which is formed as a dual clutch 34, has two clutches 44, 46 with corresponding pressure plates, counterplates, clutch disks and actuation devices.

(9) The rotor element 18 has, in its interior, a rotor bearing arrangement 48 which serves as central bearing device 50, by means of which the entire functional unit 16 is rotatably mounted in the housing unit 28.

(10) FIG. 3 shows a detail view of FIG. 1. The following description makes reference to FIGS. 1 and 3. The separating clutch 20 is hydraulically actuable. It has a pressure plate 52 and a counterplate 54 and is actuated by means of a disengagement device 56 via a pressure connector 58. The disengagement device 56 has a disengagement bearing 60, a central disengagement means unit with a piston 62 for transmitting force to the disengagement bearing 60, and a pressure pot 64 for transmitting force from the disengagement bearing 60 to the pressure plate 52 of the separating clutch 20. Piston 62 includes mean piston diameter 63 and guide length 65. The transmission of force by means of said pressure pot 64 is a transmission of force without a lever action.

(11) The following function is realized:

(12) The piston 62 of the central disengagement means acts on the disengagement bearing 60, which in turn acts directly on the pressure pot 64, which is connected to a pressure plate 52 of the separating clutch 20, without a lever mechanism between disengagement bearing 60 and separating clutch 20.

(13) FIG. 2 shows another embodiment of the hybrid module 14. This substantially corresponds to the embodiment of the hybrid module 14 from FIG. 1, such that only the differences will be discussed here. In this embodiment, the pressure pot 64 and the pressure plate 52 are integrally connected, that is to say form an integral unit 66.

(14) If said unit 66, which combines the functionality of the pressure pot 64 and the pressure plate 52, is used, a leaf spring connection 53 of the pressure plate 52 to a rotor web 55 is provided radially outside the disengagement bearing 60 and the central disengagement means (piston 62) in order to thereby reduce the required structural space.

(15) The piston 62 of the central disengagement means acts on the disengagement bearing 60, which in turn acts directly on the unit 66, which combines the functionality of the pressure pot 64 and of the pressure plate 52 without a lever mechanism between disengagement bearing 60 and separating clutch 20.

(16) Owing to the axially short extension through the inside of the rotor web, with a leaf spring connection simultaneously arranged radially outside the engagement bearing 60 and the CSC piston 62, the available structural space can be optimally utilized.

(17) The directly actuated separating clutch 20 is characterized, owing to the absence of friction points of an absent lever actuation means, by a very small degree of actuation hysteresis. Said small degree of force hysteresis permits torque regulation at the separating clutch 20 by means of the direct regulation of the pressure in the CSC.

(18) Owing to the use of a short-piston CSC with possible tilting of the piston 62, it is furthermore possible to compensate actuation oblique positions such as may arise owing to geometrical oblique position errors of the pressure pot 64 of the pressure plate 52 and counterplate 54 and of the disk. Without said tilting compensation, torque excitations may arise which are dependent on the rotational speed difference.

LIST OF REFERENCE DESIGNATIONS

(19) 10 Drivetrain 12 Machine, electric 14 Hybrid module 16 Functional unit 18 Rotor element 20 Separating clutch 22 Clutch part 24 Clutch device 26 Stator, electric machine 28 Housing unit 30 Dual-mass flywheel 32 Housing part (transmission) 34 Dual clutch 36 Transmission input shaft, first 38 Transmission input shaft, second 40 Output shaft 42 Axis 44 Clutch, first 46 Clutch, second 48 Rotor bearing arrangement 50 Bearing device, central (functional unit) 52 Pressure plate (separating clutch) 53 Leaf spring connection 54 Counterplate (separating clutch) 55 Rotor web 56 Disengagement device 58 Pressure connector 60 Disengagement bearing 62 Piston 63 Piston mean diameter 64 Pressure pot 65 Piston guide length 66 Unit, integral