Hybrid module and drivetrain

Abstract

A hybrid module for coupling an internal combustion engine in a motor vehicle includes an axis of rotation, an electric machine, a space, and a clutch. The electric machine has a rotor arranged on the axis of rotation. The space is surrounded by the rotor. The clutch is for transmitting a torque from a drive assembly. The clutch is arranged in the space surrounded by the rotor and includes a rotational part fixed to the rotor and arranged on the axis of rotation. The rotational part extends further radially from the axis of rotation than the rotor such that a heat introduced into the rotational part from the rotor or the clutch can be discharged.

Claims

1. A hybrid module for coupling an internal combustion engine in a motor vehicle, comprising: an axis of rotation; an electric machine including a rotor arranged on the axis of rotation; a space surrounded by the rotor; an actuating clutch: for selectively transmitting a torque from the internal combustion engine to the rotor; and arranged in the space surrounded by the rotor; and, a first friction clutch at least partially arranged in the space surrounded by the rotor; and a rotational part fixed to the rotor and arranged on the axis of rotation, wherein: the rotational part extends further radially from the axis of rotation than the rotor such that a heat introduced into the rotational part from the rotor or the first friction clutch can be discharged; and the rotational part includes: a radially outer side; a plurality of planar component segments arranged axially adjacent to one another on the radially outer side; and a radially outer region with shaped elements radially outside of and connecting the plurality of planar component segments.

2. The hybrid module of claim 1, wherein the rotational part is at least partially arranged in the space surrounded by the rotor.

3. The hybrid module of claim 1, wherein the rotational part is a counterpressure plate for the first friction clutch.

4. The hybrid module of claim 1 further comprising a second friction clutch, wherein the rotational part is a constituent part of the first friction clutch and the second friction clutch.

5. The hybrid module of claim 1, wherein: the rotor is arranged on a rotor support; and, the rotational part is connected firmly by mechanical means to the rotor support or is an integral constituent part of the rotor support.

6. The hybrid module of claim 1, wherein the rotational part is rotationally symmetric with a diameter Dt having the following relationship to a diameter Dr of the rotor: Dt/Dr=1.1 to 2.0.

7. The hybrid module of claim 1, wherein the shaped elements are arranged to promote an air flow with a radial component when the rotational part is rotated.

8. The hybrid module of claim 1, wherein: the rotational part includes a radially inner region and a region offset between the radially inner region and the radially outer region; the radially inner region is arranged in the space surrounded by the rotor; and, the radially outer region is axially offset on one side of the rotor.

9. A drivetrain for a motor vehicle comprising: the internal combustion engine; a drive transmission; and the hybrid module of claim 1 mechanically connected to the drive transmission.

10. A hybrid module for a motor vehicle for coupling an internal combustion engine, comprising: an axis of rotation; an electrical machine comprising: a rotor arranged on the axis of rotation; and a space enclosed by the rotor; a rotary part rotationally connected to the rotor and arranged on the axis of rotation, wherein: the rotary part extends further radially from the axis of rotation than the rotor so that heat introduced into the rotary part by the rotor can be dissipated into the surroundings of the rotary part; the rotary part comprises a plurality of planar component segments: arranged axially next to one another with a continuous gap therebetween that is radially delimited by an outer circumferential surface of the plurality of component segments; and arranged in parallel with one another in a radial extension with a distance between the component segments that improves heat dissipation from the component segments and enlarges a surface of the rotary part.

11. The hybrid module of claim 10 further comprising a clutch for transmitting torque from the internal combustion engine arranged in the space enclosed by the rotor.

12. The hybrid module of claim 10, wherein the rotary part is at least partially arranged in the space enclosed by the rotor.

13. The hybrid module of claim 10 wherein the rotary part forms a counterpressure plate of a friction clutch at least partially arranged in the space enclosed by the rotor.

14. The hybrid module of claim 10 further comprising two clutches at least partially arranged in the space enclosed by the rotor, wherein the rotary part is a part of at least one of the two clutches.

15. The hybrid module of claim 10, wherein the rotor of the electrical machine is arranged on a rotor carrier and the rotary part is a component fixed to the rotor carrier or integrally formed from a same piece of material as the rotor carrier.

16. The hybrid module of claim 10, wherein: the rotary part is rotationally symmetrical; and a diameter Dt of the rotary part is related to a diameter Dr of the rotor in the following ratio: Dt/Dr=1.1 to 2.0.

17. The hybrid module of claim 10, wherein the rotary part comprises shaped elements in a radially outer region that promote a radial air flow upon rotation of the rotary part.

18. The hybrid module of claim 10 wherein the rotary part comprises: a radially inner region; a radially outer region; and a region disposed between the radially inner region and the radially outer region, wherein: the radially inner region is arranged in the space enclosed by the rotor; and the radially outer region extends on an axial side of the rotor axially offset from the radially inner region.

19. A drivetrain for a motor vehicle comprising: an internal combustion engine; a drive transmission; and the hybrid module of claim 10 mechanically connected to the internal combustion engine and to the drive transmission by at least one clutch.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The disclosure described above is explained in detail below in relation to the relevant technical background, with reference to the associated drawings, which show example embodiments. The disclosure is not in any way restricted by the purely schematic drawings, and it should be noted that the illustrative embodiments shown in the drawings are not restricted to the dimensions illustrated. In the drawings:

(2) FIG. 1 shows a first embodiment of a hybrid module according to the disclosure in a sectional view,

(3) FIG. 2 shows a rotational part of the hybrid module according to the disclosure in a partially sectioned perspective view,

(4) FIG. 3 shows the rotational part of the hybrid module according to the disclosure in a perspective view,

(5) FIG. 4 shows a second embodiment of the hybrid module according to the disclosure in a sectional view.

DETAILED DESCRIPTION

(6) FIGS. 1 and 4 show two different embodiments of the rotational part and, accordingly, also of the overall hybrid module according to the disclosure, and FIGS. 2 and 3 show the same rotational part in a different view.

(7) First of all, the general structure of the hybrid module according to the disclosure will be explained with reference to FIG. 1. The hybrid module 1 has an axis of rotation 2, on which, in the embodiment illustrated here, a dual mass oscillator 3, a drive shaft 4 for the connection of a drive assembly (not illustrated here), e.g. an internal combustion engine, a first output shaft 5 of a double clutch transmission and a second output shaft 6 of the double clutch transmission are jointly arranged. An electric machine 10, the rotor 11 of which rotates around the axis of rotation 2 in a stator 13, is likewise arranged on the axis of rotation 2. In this case, the rotor 11 is arranged on a rotor support 12.

(8) The hybrid module 1 furthermore includes a first clutch 30, which is mechanically coupled to the first output shaft 5, and a second clutch 40, which is coupled to the second output shaft 6. In this arrangement, the first clutch 30 and the second clutch 40 form a clutch unit 20 of the double clutch transmission (not illustrated here). The clutches arranged here, at least the first clutch 30 and the second clutch 40, may be embodied as dry clutches.

(9) Moreover, the hybrid module 1 includes a separating clutch 50, by which the drive shaft 4 can be mechanically connected to the rotor 11 via the rotor support 12. To actuate the sub-clutches, the first clutch 30 is assigned a first actuating system 33 and the second clutch 40 is assigned a second actuating system 43. The separating clutch 50 is assigned a separating clutch actuating system 54. By the actuating systems 33, 43, 54, the respective clutches 30, 40, 50 can be opened and closed and, in this way, torques can be transmitted.

(10) Actuation of the separating clutch actuating system 54 causes the pressure plate 52 of the separating clutch 50 to be moved axially, thus enabling it to fix a clutch disk 51 between itself and the counterpressure plate 53 of the separating clutch 50 by frictional engagement and, in this way, enabling it to transmit torque from the drive shaft 4 to the rotor support 12, which is connected to the clutch disk 51 of the separating clutch 50. Depending on the actuation of the first clutch 30 or of the second clutch 40 by means of the first actuating system 33 or of the second actuating system 43, the respective pressure plate, namely the first pressure plate 32 or the second pressure plate 42, is moved axially in such a way that the first clutch disk 31 or the second clutch disk 41 is fixed between the respective pressure plate 32, 42 and a counterpressure plate 71 by frictional engagement. This enables torque to be transmitted from the rotor support 12 connected in a fixed manner to the counterpressure plate 71, via the respective clutch disk, namely via the first clutch disk 31 or via the second clutch disk 41, to the first output shaft 5 or the second output shaft 6.

(11) The counterpressure plate 71, which is used for the first clutch 30 and also for the second clutch 40, is here embodied as a rotational part 70, which extends radially outward axially adjacent to the rotor 11 and also adjacent to the stator 13 of the electric machine 10. This rotational part 70 is connected in a fixed manner to the rotor support 12 by a fasteners 60, in this case by the screw illustrated. By means of the rotor 11 of the electric machine 10, it is thus possible in a simple manner, by heat conduction, for heat from the electric machine 10 to be introduced via the rotor support 12 into the rotational part 70 and, from there, dissipated to the environment of the rotational part, in this case the bell air 80. By convection, the heat of this bell air 80 can be discharged to the surrounding housing 7, only partially illustrated here, and, from there, to the ambient air of the hybrid module 1.

(12) It is apparent that the separating clutch 50 is arranged fully in the space 15 surrounded by the rotor 11, and the first clutch 30 is arranged partially therein. In this case, this space 15 surrounded by the rotor is an ideal cylinder, which is formed by the inside of the rotor 11 as it rotates.

(13) It is clearly apparent that the diameter Dr of the rotor 11 is smaller than the diameter Dt of the rotational part 70. This ensures that the area of the rotational part 70 is large and hence that a large area is available for heat dissipation to the environment. Moreover, the radially outer region of the rotational part 70 has a higher peripheral speed than the rotor 11 itself, and therefore, efficient heat dissipation to the environment is ensured, especially since the high speed causes the formation of turbulence in the bell air 80, which promotes heat dissipation.

(14) It is furthermore apparent that the rotational part 70 has a plurality of component segments 72 arranged axially adjacent to one another. In this respect, attention is drawn to FIGS. 2 and 3. From FIGS. 2 and 3, it is apparent that these component segments 72 are arranged parallel to one another in the radial direction. There is a spacing 75 or gap between them which promotes the dissipation of heat from the component segments 72 and thus increases the surface area of the rotational part 70 overall. Thus, the rotational part 70 includes an annular segment 73, which is connected by webs 76 to a flat segment 74 formed at least in the radially outer region of the rotational part 70.

(15) Here, a web 76 of this kind is of such narrow design that air present in the region of the spacing 75 between the component segments 72 can escape radially from the region between the annular segment 73 and the flat segment 74 by virtue of the rotation of the rotational part 70 and the centrifugal force acting on the air during this process. To achieve the discharge of the heat from the electric machine and/or the clutches from the space 15 surrounded by the rotor 11 or to transmit the heat from the electric machine 10 by heat conduction, the rotational part has a radially inner region 77, which also serves as the counterpressure plate 71. Adjoining this radially inner region 77 is an offset region 79, from which, in turn, the radially outer region 78 extends radially outward. This radially outer region 78 forms the flat segment 74 of the rotational part 70, to which the annular segment 73 extending parallel thereto is connected in the manner described via the webs 76.

(16) FIG. 4 illustrates an embodiment of the hybrid module according to the disclosure which is similar to that shown in FIG. 1. In the embodiment shown in FIG. 4, the difference with respect to the embodiment illustrated in FIG. 1 consists in the fact that the rotational part 70 has just one flat segment 74 as a radially outer region 78 and has no mass arranged parallel thereto, as illustrated in FIG. 1.

(17) Common to both embodiments illustrated in FIGS. 1 and 4 is the fact that the diameter Dt of the rotational part 70 is greater than the diameter Dr of the rotor 11. In other words, the radially outer region 78 of the rotational part 70 extends further out radially in relation to the axis of rotation 2 than the distance from the axis of rotation 2 of the gap 14 between the stator 13 and the rotor 11 of the electric machine 10.

(18) The hybrid module proposed here provides a compact unit having a plurality of integrated clutches, embodied as dry clutches, for example, which can be produced at low cost and has low torque losses.

REFERENCE NUMERALS

(19) 1 hybrid module

(20) 2 axis of rotation

(21) 3 dual mass oscillator

(22) 4 drive shaft

(23) 5 first output shaft

(24) 6 second output shaft

(25) 7 housing

(26) 10 electric machine

(27) 11 rotor

(28) 12 rotor support

(29) Dr diameter of the rotor

(30) 13 stator

(31) 14 gap

(32) 15 space surrounded by the rotor

(33) 20 clutch unit

(34) 30 first clutch

(35) 31 first clutch disk

(36) 32 first pressure plate

(37) 33 first actuating system

(38) 40 second clutch

(39) 41 second clutch disk

(40) 42 second pressure plate

(41) 43 second actuating system

(42) 50 separating clutch

(43) 51 clutch disk of the separating clutch

(44) 52 pressure plate of the separating clutch

(45) 53 counterpressure plate of the separating clutch

(46) 54 separating clutch actuating system

(47) 60 fastening means

(48) 70 rotational part

(49) 71 counterpressure plate

(50) Dt diameter of the rotational part

(51) 72 component segment

(52) 73 annular segment

(53) 74 flat segment

(54) 75 spacing

(55) 76 web

(56) 77 radially inner region

(57) 78 radially outer region

(58) 79 offset region

(59) 80 bell air