Hybrid module for a drive train of a hybrid vehicle and such a drive train

Abstract

A hybrid module for a drive train of a vehicle includes an intermediate shaft configured for torque transmission from an internal combustion engine and/or an electric machine to a transmission. The shaft is mounted on a dividing wall by two bearings, wherein a securing element is provided on a transmission side of the dividing wall to fix an axial position of a torque transmission component that can be mounted on the intermediate shaft on a motor/engine side of the dividing wall.

Claims

1. A hybrid module for a drive train of a vehicle, comprising: an intermediate shaft configured for torque transmission from an internal combustion engine and/or an electric machine to a transmission, the shaft being mounted on a dividing wall by two bearings, wherein a securing element provided on a transmission side of the dividing wall fixes an axial position of a flywheel mounted on the intermediate shaft, wherein the flywheel includes a flange section arranged between the intermediate shaft and a flange section of the dividing wall.

2. The hybrid module as claim 1, wherein the flange section of the flywheel is arranged between one of the two bearings and the intermediate shaft.

3. The hybrid module as claimed in claim 2, wherein the flange section of the flywheel is arranged between an inner ring of the one bearing and an outer side of the intermediate shaft.

4. The hybrid module as claimed in claim 3, wherein an end face, situated on a motor/engine side of the dividing wall, of the flange section of the flywheel is in contact with a side face of an inner ring of the other bearing.

5. The hybrid module as claimed in claim 1, wherein an outside diameter of the intermediate shaft decreases from a motor/engine side of the dividing wall toward the transmission side.

6. The hybrid module as claimed in claim 1, wherein the intermediate shaft has, on a motor/engine side of the dividing wall, a flange-type radial projection, which is formed integrally with the intermediate shaft.

7. The hybrid module as claimed in claim 6, wherein the projection is used as a connection to a separating clutch.

8. A drive train for a vehicle, having an internal combustion engine, a transmission, and a hybrid module as claimed in claim 1, arranged between the internal combustion engine and the transmission.

9. A hybrid module for a vehicle, comprising: a shaft configured to transmit torque from an engine and/or an electric machine to a transmission, wherein the shaft is mounted on a dividing wall via a first bearing and a second bearing; a separating clutch mounted on the shaft on a motor/engine side of the dividing wall; a securing element disposed on a transmission side of the dividing wall; and a flywheel arranged on the transmission side of the dividing wall and connected to the shaft by the securing element, wherein the flywheel includes a flange section arranged between the first bearing and the shaft, wherein an axial position of the flywheel is fixed by the securing element.

10. The hybrid module of claim 9, wherein the flange section of the flywheel is disposed between an inner ring of the first bearing and the shaft.

11. The hybrid module of claim 9, wherein the first bearing is axially closer to the transmission side of the dividing wall than the second bearing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present disclosure is explained in greater detail below with the aid of figures, in which different embodiments are illustrated. Of the figures:

(2) FIG. 1 shows a section through a hybrid module according to the present disclosure with a partial illustration of the motor/engine and transmission attachment;

(3) FIG. 2 shows a construction according to the present disclosure of a hybrid module in section;

(4) FIG. 3 shows a multi-part embodiment of an inner plate carrier having a carrier plate with a belt track for P2 hybrid systems;

(5) FIG. 4 shows the carrier element from FIG. 3 in the assembled state;

(6) FIG. 5 shows the carrier element from FIG. 3 and FIG. 4 in the fitted state;

(7) FIG. 6 shows a detail of area VI from FIG. 5;

(8) FIG. 7 shows a perspective view of the inner plate carrier in a different embodiment; and

(9) FIG. 8 shows a section through the embodiment of the inner plate carrier shown in FIG. 7.

(10) The figures are of a purely schematic nature and serve only to aid understanding of the present disclosure. Identical elements are provided with the same reference signs.

(11) Features of the individual illustrative embodiments can also be implemented in other illustrative embodiments. They are therefore interchangeable.

DETAILED DESCRIPTION

(12) FIG. 1 shows a section through a hybrid module 1, which is designed as a “P2 hybrid module”. A P2 hybrid module is taken to mean a hybrid module which is arranged in a drive train for a vehicle, between an internal combustion engine (on the left in FIG. 1) and a transmission (on the right in FIG. 1).

(13) The hybrid module 1 has an intermediate shaft 2, which is mounted on a dividing wall 5 by means of two (support) bearings 3, 4. In relation to the dividing wall, a distinction is drawn between a transmission side 6 (on the right of the dividing wall 5 in FIG. 1) and a motor/engine side 7 (on the left of the dividing wall 5 in FIG. 1) of the intermediate shaft 2.

(14) Arranged on the motor/engine side of the dividing wall 5 is a separating clutch (K0 clutch) 9, which serves to connect either an internal combustion engine or an electric machine in a torque-transmitting manner to the intermediate shaft 2. Arranged on the transmission side is a starting clutch (K1 clutch) 10, which is connected in a torque-transmitting manner to the intermediate shaft 2 via a flywheel 11. The components arranged on the intermediate shaft 2, including the starting clutch 10 or the flywheel 11, are positioned axially from the transmission side 6 by means of a securing element 8.

(15) A dual mass flywheel 12, which serves to damp the oscillations and vibrations from the internal combustion engine, is furthermore illustrated on the left-hand side of the intermediate shaft 2. The starting clutch 10, which has the flywheel 11 and, inter alia, a clutch disk 13 and a clutch pressure plate 14, is illustrated on the right-hand side of the intermediate shaft 2. The starting clutch 10 serves to transmit torque or to interrupt torque transmission from the intermediate shaft 2 to the transmission (not illustrated).

(16) The separating clutch 9 is arranged on the intermediate shaft 2 and is fastened on a flange-type radial projection 16 of the intermediate shaft 2 via an inner plate carrier 15. In the embodiment illustrated here, the inner plate carrier 15 is embodied as a carrier plate 17 having a belt track 18, which transmits the torque of the electric machine, e.g. an electric motor (not shown here), to the intermediate shaft 2 via the separating clutch 9 when appropriate.

(17) Such an embodiment is preferred especially for axially parallel hybrid arrangements. As an alternative, the fastening of a rotor carrier for the rotor of the electric machine is also conceivable instead of the belt track 18. This embodiment is preferred especially for coaxial hybrid systems.

(18) Here, the separating clutch 9 is illustrated as a “normally closed” clutch, which means that the separating clutch is closed in the unactuated state and is thus connected to the internal combustion engine in a torque-transmitting manner. Actuation of a release mechanism 19 opens the separating clutch 9 and thus connects it to the electric motor in a torque-transmitting manner.

(19) The exact arrangement and positioning of the components on the intermediate shaft 2 is described in detail below with reference to FIG. 2.

(20) FIG. 2 shows the hybrid module 1, which in FIG. 1 is arranged between the internal combustion engine (on the left in FIG. 1, not illustrated) and the transmission (on the right in FIG. 1, not illustrated). In order to simplify the illustration of the components essential to the present disclosure, the separating clutch 9 and the starting clutch 10 are not illustrated in FIG. 2, with the exception of the flywheel 11. Only the inner plate carrier 15 of the separating clutch 9, in the form of the carrier plate 17 with belt track 18, is depicted.

(21) The intermediate shaft 2 has an outside diameter which decreases substantially from the motor/engine side 7 to the transmission side 6, with the exception of the flange-type radially outward-projecting projection 16, which is arranged on the motor/engine side of the intermediate shaft 2, in relation to the dividing wall 5. In this arrangement, the intermediate shaft 2 and the projection 16 are of integral design. The flange-type projection 16 serves, on the one hand, for the fastening of or connection to the inner plate carrier 15, which is fastened to the projection 16 with the aid of a rivet 20 in the illustrative embodiment shown here. As an alternative, some other connecting element, e.g. a screw etc., is also conceivable instead of the rivet 20. On the other hand, the flange-type projection 16 serves as a stop surface for an inner ring 21 of the bearing 4 closer to the motor/engine, which limits the movement in the axial direction of the inner ring 21 in one direction (to the left in FIG. 2) as it is pushed onto the intermediate shaft 2.

(22) Here, the bearings 3, 4 are designed as rolling bearings, to be more precise as ball bearings. However, other types of rolling bearing, e.g. roller bearings etc., are also conceivable. The two bearings 3, 4 support the intermediate shaft 2 on the dividing wall 5 or provide a mounting for the intermediate shaft 2 on/in the dividing wall 5. Here, the (support) bearing 3 is designed as an angular contact bearing and is in contact, by means of its outer ring 22, laterally with (a projection) of the dividing wall 5. An inner ring 23 of the bearing 3 closer to the transmission is arranged on or pushed onto a flange section 24 of the flywheel 11. In this case, a side face of the inner ring 23 rests against the flywheel 11.

(23) The flange section 24 of the flywheel 11 extends to the left in the axial direction in FIG. 2 from the flywheel 11 (away from the starting clutch 10) and, on its inside diameter, has an interface or connection 25, by means of which the flywheel 11 is connected in a torque-transmitting manner to the intermediate shaft 2. The interface 25 is in the form of a shaft-hub connection, for example. As a result, the intermediate shaft 2—with the flange section 24 inserted/arranged in between—is supported in/on the dividing wall 5 via the bearing 3.

(24) Moreover, the flange section 24 serves for the axial fixing or positioning of the inner ring 21 of the bearing 4 closer to the motor/engine in that a motor/engine-side end face 26 of the flange section 24 rests against a transmission-side side face 27 of the inner ring 21.

(25) The components arranged on the intermediate shaft 2, including the bearings 3, 4, the separating clutch 9 (see FIG. 1) and the flywheel 11, are positioned in an axially determinate way on the transmission side by means of the securing element 8, in this case in the form of a screw 28.

(26) As an alternative, a nut, a retaining ring or similar securing elements and a combination of a plurality of elements, referred to as a “securing element combination”, are also conceivable as securing elements.

(27) By virtue of the embodiment shown here of the intermediate shaft 2 and of the arrangement of the components, it is possible to axially secure or position both the components on the motor/engine side 7 (i.e. on the left of the dividing wall 5) and on the transmission side 6 (i.e. on the right of the dividing wall 5) from the direction of the transmission side 6, using just one securing element 8.

(28) FIG. 3 to FIG. 8 show various embodiments of the inner plate carrier 15.

(29) The inner plate carrier 15 serves, inter alia, to center and guide the plates (not illustrated), to transmit the torque of the internal combustion engine, to transmit the torque of the electric machine, and to provide an interface with the intermediate shaft and with the electric machine, e.g. an electric motor.

(30) In FIGS. 3 to 8, the inner plate carrier 15 is of multi-part design. By virtue of this multi-part design, it is possible to produce the complex geometry of the inner plate carrier 15 with a small number of forming steps. Moreover, degrees of freedom in respect of differences in material thickness, selection of material and heat treatment of the individual components become possible.

(31) The inner plate carrier 15 in the illustrative embodiment shown here has an inner cage 29, the carrier plate 17 with the belt track 18, and a connecting element 30 to the intermediate shaft 2, which is here in the form of a hub 31. In particular, it is possible to dispense with the connecting element 30 if the inner plate carrier 15 is connected to the intermediate shaft 2 in some other way, as shown in FIG. 2 for example.

(32) The inner cage 29 has a plurality of fingers 32, which extend along the circumferential direction of the inner cage 29 in an axial direction A in FIG. 3. The carrier plate 17 has windows/apertures/openings 33 corresponding thereto and arranged along the circumferential direction, into which the fingers 32 engage during assembly (see FIG. 4). The hub 31 is fastened on the inner cage 29 with the aid of a plurality of screws 34 (see FIG. 4) arranged along the circumferential direction of the hub 31, for example.

(33) After the fingers 32 have been pushed through the respective windows 33 (see FIG. 4) corresponding thereto, the fingers 32 protrude from the windows 33 in the axial direction and are formed in such a way by means of a forming process, e.g. roller forming or stamping, that the inner cage 29 and the carrier plate 17 are inseparably connected. As shown in FIG. 5 such a forming process can form the ends of the fingers 32, which extend through the windows 33, into closing heads 35. This gives rise to a positive joint, similar to a riveted joint, although additional connecting elements, e.g. rivets, are dispensed with.

(34) FIG. 6 shows the positive joint with the aid of the closing heads 35 once again in an enlarged illustration. By means of this type of joint between the inner cage 29 and the carrier plate 17, it is possible to dispense with overlapping geometries of the kind required for screwed or riveted joints, thereby allowing compact embodiment and thus a reduction in installation space. As compared with a welded joint, a positive joint of this kind does not have any welding distortion or any restriction in respect of the material.

(35) Staked joints of the kind that are already known, for example, for connecting the hub and the hub flange in the case of clutch disks are also conceivable as an alternative type of joint.

(36) FIG. 7 and FIG. 8 show a different further embodiment of the inner plate carrier 15, in which the connecting element 30 is embodied integrally in the form of the hub 31 and the inner cage 29. Here, the region of the hub 31 is embodied in a manner similar to a forged hub and is deep-drawn from the inner cage 29.

(37) By virtue of the multi-part embodiment of the inner plate carrier 15, the individual components can be produced from different materials and/or from various material thicknesses. The following arrangement represents an advantageous combination in this context: the torque introduction element is produced in the form of a hub 31 made from forged steel or cast material, for example. The inner cage 29 is produced from sheet metal with a tooth system for the plates, and the carrier plate 17 with the belt track 18 (as a kind of belt pulley) is likewise produced from sheet metal but with a different sheet thickness. The joint between the hub 31 and the inner cage 29 is formed by means of rivets, whereas the joint between the inner cage 29 and the carrier plate 17 is implemented by means of the forming method described, e.g. in the form of roller forming.

LIST OF REFERENCE SIGNS

(38) 1 hybrid module

(39) 2 intermediate shaft

(40) 3 (support) bearing

(41) 4 (support) bearing

(42) 5 dividing wall

(43) 6 transmission side

(44) 7 motor/engine side

(45) 8 securing element

(46) 9 separating clutch (K0 clutch)

(47) 10 starting clutch (K1 clutch)

(48) 11 flywheel

(49) 12 dual mass flywheel (DMF)

(50) 13 clutch disk

(51) 14 clutch pressure plate

(52) 15 inner plate carrier

(53) 16 flange-type radial projection

(54) 17 carrier plate

(55) 18 belt track

(56) 19 release mechanism

(57) 20 rivet

(58) 21 inner ring

(59) 22 outer ring

(60) 23 inner ring

(61) 24 flange section

(62) 25 interface/connection

(63) 26 end face

(64) 27 side face

(65) 28 screw

(66) 29 inner cage

(67) 30 connecting element

(68) 31 hub

(69) 32 finger

(70) 33 window/aperture/opening

(71) 34 screw

(72) 35 closing head

(73) A axial direction