DE102007050235A1 - Drive system for a vehicle - Google Patents

Abstract

A drive system for a vehicle comprises a wet-running multi-disc clutch (18) for selectively producing a torque transmission connection between a drive member (14) and a driven member (16), the wet-running multi-disc clutch (18) having an input portion (20) with a drive-side plate pack (60) and an output portion (22) having a driven side plate pack (52), a rotor assembly (38) of an electric machine (36) coupled to the output portion (22) of the wet running multi - disc clutch (18), an interrupt clutch assembly (26) having one with the Drive member (14) to be coupled input region (32) and one with the input region (20) of the wet-running multi-disc clutch (18) coupled output region (34).

Description

The The present invention relates to a drive system for a vehicle, in which by a wet-running multi-plate clutch torque between a drive unit, for example an internal combustion engine, and the wider range of a powertrain, so for example a Transmission, transmitted becomes. The output range of the wet-running multi-disc clutch is further coupled to a rotor assembly of an electric machine, which supportive or can provide torque in the single drive.

In a state in which the internal combustion engine is not operated and a drive torque is supplied from the electric machine is generally the wet-running multi-plate clutch in one disengaged Status. This creates a problem in that by the in the field the disk packs of this clutch fluid is present, which due to its viscosity and by that also by the small distance between the individual ones Slats resulting shear forces leads to a drag torque, which binds the overall efficiency of such a system.

It The object of the present invention is a drive system for a vehicle to provide, with which when using a wet-running multi-plate clutch as a starting clutch or to perform switching operations the in particular by interaction with the fluid in this wet-running Multi-plate clutch generated efficiency losses reduced or eliminated can be.

According to the invention this Task solved by a drive system for a vehicle comprising a wet-running multi-plate clutch for optional Production of a torque transmission connection between a drive member and a drive member, wherein the wet-running multi-plate clutch an input area with a drive-side Disc pack and an output area with a driven side Disc pack, a rotor assembly of an electric machine, which coupled to the output range of the wet-running multi-plate clutch is an interruption clutch assembly with one with the drive member to be coupled input area and one with the input area the wet-running multi-plate clutch coupled output range.

at the drive system according to the invention So is the possibility by the interrupt clutch arrangement created, the torque flow between the drive member, ie For example, a crankshaft of an internal combustion engine, and the Interrupt entry area of wet-running multi-plate clutch.

In a state in which a drive torque substantially is provided only by the electric machine and thus the Wet-running multi-plate clutch is also disengaged, can be transmitted through fluidic interaction drag torques thus not on the then, for example, non-rotating drive member be supported and therefore not contribute to efficiency losses. Is a drive torque from the drive member via passed the wet-running multi-plate clutch in the drive train or vice versa, the braking torque of a drive unit, ie For example, an internal combustion engine to be used, so is the interruption clutch arrangement is engaged, so that a coupling between the input area of the wet-running multi-disc clutch and the drive member.

at a particularly simple and low-wear to be realized design variant It is proposed that the interruption clutch arrangement a Positive lock comprises. This positive coupling can basically in Direction canceling the positive connection to be biased.

Around realize a positive connection between the input area and the output area to be able to It is suggested that these each in Drehkopplungseingriff Include engageable gears. The cancellation and production of the positive connection can then, for example, by an axially displaceable toothing element of the output area.

Around thereby realize a normal-open type of positive coupling to be able to It is proposed that the toothed element in the direction of picking up is biased by the Drehkopplungseingriffs. The production of the Drehkopplungseingriffs, ie the form-locking state of the form-locking coupling For example, by a the toothed element against his Preload acting on admission member done.

There through the positive coupling in a process of manufacture of the positive connection generally two modules together Coupling are, at least with slightly different speeds Rotate, it is further proposed that the positive coupling a synchronization arrangement is assigned.

These Synchronization arrangement can, for example, at the entrance area and the output region of the form-locking coupling comprise synchronizing friction surfaces, which when adjusting the form-locking coupling in the direction of manufacture the positive connection before making the positive connection in frictional engagement reach.

Also the wet-running multi-plate clutch can be used to produce the friction engagement between the two disk sets of the same one these disk packs frictionally engaging urging member.

Around basically design the wet-running multi-plate clutch as a normal-open clutch, It is also proposed that the host institution of the wet-running multi-plate clutch is biased towards disengagement.

The activity the two clutches, so the wet-running multi-plate clutch and the form-locking coupling can, in a structurally simple way be realized that the admission bodies by fluid pressure can be acted upon against the respective bias voltage. It can be provided be that the wet-running multi-plate clutch and the positive clutch in each case a pressure fluid space for receiving the respective Beaufschlagungsorgan have pressurizing fluid acted upon.

Around make the structure very easy and also the operation with preferably to realize a low tax expense is further proposed, that the pressure fluid space of the wet-running multi-plate clutch and the Pressure fluid space of the form-locking coupling with each other stand and over a common pressure fluid feed line can be fed with pressurized fluid are.

If in such a design for it is taken care that on the one hand the on the admission of the wet-running multi-plate clutch acting bias and the on this loading member acting pressure fluid force on each other on the one hand, and on the other hand, those on the enforcement body the positive coupling acting bias and the on this Beaufschlagungsorgan acting pressure fluid force coordinated so that at increase the fluid pressure first the form-locking coupling in a state with established positive connection between their input area and output area is brought and at further increasing fluid pressure, the wet-running multi-plate clutch is brought into an at least partially engaged state, then it becomes possible first by increasing the pressure to activate the form-locking coupling, ie the coupling of the input area the wet-running multi-plate clutch to produce the drive member, and then at further elevated Pressure the wet-running multi-plate clutch with retained positive locking to actuate the form-locking coupling, d. H. between a disengagement state and a state of engagement to adjust.

at the drive system according to the invention can for suppression be provided by torsional vibrations that the entrance area of Interrupt clutch arrangement with a secondary side one torsional vibration damper is coupled and that a primary page the torsional vibration damper assembly is to be coupled to the drive member.

A very space-saving arrangement can continue to be realized be that the rotor assembly of the electric machine and a stator assembly the electric machine, the wet-running multi-plate clutch and the interrupt clutch assembly radially outside are arranged surrounding.

The The present invention will be described below with reference to the accompanying drawings Figures detailed. It shows:

1 a principle-like longitudinal sectional view of a drive system constructed according to the invention;

2 this in 1 illustrated drive system in a state in which a drive torque is supplied from an electric machine;

3 this in 1 shown drive system in a state in which a drive torque is supplied from an internal combustion engine;

4 this in 1 shown drive system in a state in which a braking torque of an internal combustion engine is used;

5 a partial longitudinal sectional view of a design variant of the in 1 illustrated drive system;

6 a partial cross-sectional view taken along a line VI-VI in 5 ,

In 1 is a drive system constructed according to the invention, which can also be used as a hybrid module in a drive train of a vehicle, in general with 10 designated. This drive system 10 can also be used to torque between a example as an internal combustion engine 12 trained drive unit or a drive shaft 14 the same and one as a drive member 16 effective wave, such as a transmission input shaft to transmit.

The drive system 10 comprises as a central assembly a wet-running multi-plate clutch described in more detail below 18 with an entrance area 20 and an exit area 22 , The exit area 22 is with the output drive 16 rotatably coupled and thus rotatable with this about a rotation axis A.

In the torque flow between the internal combustion engine 12 and the wet-running multi-disc clutch 18 are also a Torsionsschwingungsdämpferanordnung 24 and an interruption clutch 26 , A primary page 28 the torsional vibration damper assembly 24 is with the drive shaft 14 coupled while a secondary side 30 the torsional vibration damper assembly 24 , which may be constructed, for example, as a dual mass flywheel or gas spring dual mass flywheel, with an input area 32 the disconnect clutch assembly 26 is coupled. An exit area 34 the disconnect clutch assembly 26 is with the entrance area 20 the wet-running multi-disc clutch 18 coupled.

As explained in more detail below, this is an interrupt clutch arrangement 26 Preferably designed as a form-locking coupling, so it can be switched between a state in which the torque transmission connection between the drive shaft 14 and the entrance area 20 the wet-running multi-disc clutch 18 is basically interrupted, so no torque can be transmitted, and a state in which a rotationally fixed coupling is made and thus a torque flow between the drive shaft 14 and the entrance area 20 the wet-running multi-disc clutch 18 is guaranteed.

The drive system 10 also includes a generally with 36 designated electric machine whose rotor assembly 38 with the exit area 22 the wet-running multi-plate clutch or the output member 16 is coupled for common rotation about the axis of rotation A.

In such a constructed drive system 10 can be the following with reference to the 2 to 4 realize now explained operating states.

The 2 shows a state in which a drive torque exclusively by the electric machine 36 delivered and, as indicated by an arrow M, on the output member 16 is transmitted. The wet-running multi-disc clutch 18 is disengaged in this state, leaving essentially only its output area 22 together with the rotor assembly 38 and the output organ 16 will rotate. Also the disconnect clutch arrangement 26 is in the disengaged state, ie the torque flow between the input area 20 the wet-running multi-disc clutch 18 and the drive shaft 14 the internal combustion engine 12 is interrupted.

In this state, although due to the fluidic interaction in the wet-running multi-plate clutch 18 a drag torque can be generated, which is the entrance area 20 the wet-running multi-disc clutch 18 and thus the exit area 34 the disconnect clutch assembly 26 to rotate drives. However, this drag torque is not at the entrance 32 the disconnect clutch assembly 26 supported, since the exit area 34 from this is the torso. In the wet-running multi-disc clutch 18 Thus, drag torques that occur do not lead to losses in efficiency when a drive torque from the electric machine 36 is delivered.

In the in 3 shown state provides the internal combustion engine 12 a drive torque M. The electric machine 36 For example, it is disabled or may also provide a supporting moment. The torque is transmitted through the torsional vibration damper assembly 24 in the entrance area 32 the disconnect clutch assembly 26 directed. Since this is now engaged, so a rotary coupling between the input area 32 and the exit area 34 same is also the entrance area 20 the wet-running multi-disc clutch 18 for common rotation with the drive shaft 14 connected. The wet-running multi-disc clutch 18 can now be switched between the engagement state and a disengagement, so as to be effective as a starting clutch or to perform switching operations.

In 4 is shown a state in which the braking torque of the internal combustion engine 12 is used, so the torque flow from the output member 16 on the effective drive mechanism drive shaft 14 goes. Also in this state is the disconnect clutch assembly 26 indented, which means that a non-rotatable coupling between their input area 32 and exit area 34 is made. The wet-running multi-plate clutch 18 is engaged.

By the previously explained basic Structure of a drive system according to the invention So it will be possible both with drive of the electric machine, as well as drive an internal combustion engine to work, in which case when the internal combustion engine is not working, Energy losses generated in the wet-running multi-plate clutch Towing moments can be largely excluded.

A structural design variant of such a drive system 10 will be described below with reference to the 5 and 6 explained in detail.

One recognizes in the left part of the 5 the on drive shaft 14 the internal combustion engine 12 , which in a conventional manner with the primary side 28 the here two-stage designed torsional vibration damper assembly 24 is coupled. The secondary side 30 is essentially provided by a disc-like component 40 that is radially inward with a substantially the entrance area 32 the disconnect clutch assembly 26 providing ring-like component 42 rotatably connected. This component 42 is on a fixed disc-like support element 44 rotatably mounted. On the component 42 turn is a housing assembly 46 rotatably mounted and completed with respect to this fluid-tight. This housing assembly 46 provides both for here as a form-locking coupling 48 trained disconnect clutch assembly 26 as well as the wet-running multi-disc clutch 18 a housing ready. In particular, this housing assembly forms 46 a slat support section 50 for a driven-side plate pack 52 the wet-running multi-disc clutch 18 , This output side plate set 52 forms together with the housing assembly 46 and a hollow shaft component fixedly connected thereto 54 essentially the exit area 22 the wet-running multi-disc clutch 18 , It can be seen that radially on the outside of this housing assembly 46 the rotor assembly 38 the electric machine 36 is arranged or fixed so that they are the wet-running multi-plate clutch 18 and also the form-locking coupling 48 surrounds radially outside. A stator arrangement 56 the electric machine 36 is for example together with the support element 44 worn on a fixed assembly.

A substantially the entrance area 20 the wet-running multi-plate clutch-providing plate carrier 58 essentially carries a rotationally fixed a drive-side plate pack 60 , It can be seen that drive-side disks and output-side disks alternately alternate and thus can be brought into frictional engagement with opposing friction surfaces.

The plate carrier 58 is at an example of a multi-part insert 62 the housing assembly 46 rotatably mounted. At his from the drive disk package 60 far end is the plate carrier 58 firmly connected to a transmission ring 64 a general with 66 designated synchronization arrangement of the output area 34 the disconnect clutch assembly 26 or form-locking coupling 48 , The transmission ring 64 is on the component 42 of the entrance area 32 the disconnect clutch assembly 26 rotatably mounted. Like the sectional view of the 6 shows, closes radially outward on the transmission ring 64 a synchronizing ring 68 at. The synchronizing ring 68 and the transmission ring 64 stand with respective teeth 70 . 72 in Drehkopplungseingriff, but are axially displaceable with respect to each other.

The synchronizing ring 68 surrounding radially outside is a toothed ring 74 intended. This is about a gearing 76 in Drehkopplungseingriff with a toothing 78 of the synchronizing and thus is indeed rotatably coupled thereto, but axially displaceable with respect to this. In this way, the non-rotatable connection between the toothed ring is 74 and the transmission ring 64 and thus the plate carrier 58 produced.

The gear ring 74 and the ring-like member 42 have in their axially mutually opposite regions each axially facing each other oriented gears 80 . 82 on. By axial displacement of the toothed ring 74 on the ring-like component 42 to be able to do these gearing 80 . 82 be brought into Drehkopplungseingriff. Basically, however, is the toothed ring 74 by one or more distributed over the circumference, as biasing elements 84 effective helical compression springs in the direction of the ring-like component 42 biased away and thus its interlocking 80 not in rotary coupling engagement with the toothing 82 on the ring-like component 42 , Furthermore one recognizes in 5 one between the synchronizer ring 68 and the gear ring 74 effective latching mechanism 86 , This can, distributed over the circumference, comprise a plurality of spring-loaded ball elements in corresponding depressions on the inner circumference of the toothed ring 74 engage, so that when overcoming a predetermined cogging torque of the toothed ring 74 with respect to the synchronizer ring 78 is displaceable, but otherwise by this locking mechanism 86 coupled with this.

One recognizes in 5 further, that the synchronizer ring 68 and the ring-like member 42 Opposing truncated friction surfaces 88 . 90 exhibit. These are located in the 5 illustrated basic state in which the positive coupling 48 in the disengaged state, facing each other with a small axial distance.

On the insert element 62 are two piston-like loading organs 92 . 94 axially movable, but finished fluid-tight. Thus, between the form-locking coupling 48 associated admission member 92 and the insert element 62 a pressurized fluid space 96 educated. Between the admission organ 94 the wet-running multi-disc clutch 18 and the insert element 62 is a pressurized fluid space 98 educated.

The two pressure fluid spaces 96 . 98 stand over a connection opening 100 in each other Connection. Via a common pressure fluid feed line 102 can from a source of pressurized fluid, such as a pump arranged in a gear o. The like., Pressure fluid in the pressure fluid space 96 and over the connection opening 100 also in the pressure fluid space 98 be directed. This means that on the two piston-like Beaufschlagungsorgane 92 . 94 basically essentially the same fluid pressure will act. By this fluid pressure is the Beaufschlagungsorgan 92 against the biasing action of the biasing springs 84 acted upon and the piston-like loading member 94 against the biasing action of a trained example as a plate spring biasing spring 104 applied. This biasing element 104 charged the admission body 94 in the direction of the disk packs 52 . 60 away, leaving the wet-running multi-disc clutch 18 is basically of the normal open type and only by increasing the fluid pressure in the pressure fluid space 98 can be adjusted in the direction of engagement. Also the form-locking coupling 48 is of the normal open type and can be increased by increasing the fluid pressure in the pressure fluid space 96 in the direction of engagement, ie in the direction of establishing the positive connection between the teeth 80 . 82 be adjusted.

The supply of pressurized fluid may, for example, by the hollow-shaft-like component 54 and also at least a portion of the output member 16 take place, which with this hollow shaft-like component 54 is coupled rotationally fixed, for example, by splines o. The like ..

The foregoing with reference to the 2 to 4 shown operating conditions can be adjusted by the fact that the fluid pressure in the Druckfluidräumen 96 . 98 is waived. Is this pressure at a comparatively low value or are the two pressure fluid spaces 96 . 98 essentially unpressurized, so are the two admission organs 92 . 94 each in the in the 5 recognizable position moves and both clutches, so both the wet-running multi-plate clutch 18 , as well as the form-locking coupling 48 , are disengaged. This corresponds to the state of 2 in which a drive torque by the electric machine 36 can be generated.

Should be in the in 3 be transferred state shown, the fluid pressure is increased, resulting in that initially due to the vote of the biasing elements 84 . 104 and the respective associated, acted upon by a fluid pressure surfaces of the piston-like loading members 92 . 94 the admission organ 92 against the bias of the biasing springs 84 is shifted while the toothed ring 74 moves axially. By the locking mechanism 86 this takes the synchronizing ring 68 axially with, until the two friction surfaces 88 . 90 get in mutual contact. When making this frictional engagement are the gears 80 . 82 still out of engagement. The frictional engagement has the consequence that a possibly existing speed difference between the ring-like component 42 and the entrance area 20 the wet-running multi-disc clutch 18 is eliminated. A then continuing movement of the toothed ring 74 in the axial direction with an axially no longer displacing synchronizing ring 68 is by triggering the locking mechanism 86 possible, so that with further fluid pressure increase then the two gears 80 . 82 can be brought into Drehkopplungseingriff and the Fomrschlusskuplung 48 in the form-fitting state, that is engaged. It may be advantageous, at least one of the teeth 80 . 82 with teeth to be tapered in the axial direction to the other toothing, so that in the circumferential direction still existing overlap of the teeth of the two teeth 80 . 82 by then sliding off each other inclined surfaces a slight relative rotation between the entrance area 32 and the exit area 34 the form-locking coupling 48 can be forced.

When to engage the positive clutch 48 required fluid pressure is the wet-running multi-plate clutch 18 still in the disengaged state. Ie. This pressure is not sufficient to the piston-like actuator 94 against the biasing action of the biasing member 104 to move so that the disk packs 52 . 60 be brought into frictional interaction. Only a further increase of the fluid pressure causes this with the result that by the variation of the fluid pressure in a range which is above that value for engaging the positive clutch 48 is required, the wet-running multi-plate clutch 18 can be adjusted between an engagement state and a release state, without losing the positive connection of the form-locking coupling 48 repealed. It can thus be in the 3 and 4 shown state, in which then either a torque from the drive shaft 14 on the example designed as a transmission input shaft output member 16 is passed, or is passed in the engine braking state, ie thrust state in the other direction. In this state, in principle, a supporting torque from the electric machine 36 to be provided.

The state in which the positive coupling 48 is engaged and also the wet-running multi-plate clutch 18 can also be used, via the electric machine 36 the internal combustion engine 12 to start. For this purpose, the pressure must be raised to an area in which the wet running multi-plate clutch 18 then a torque from the rotor assembly 38 and therefore their starting area 22 on her entrance 20 and over the form-locking coupling 48 on the drive shaft 14 can transfer. For this purpose, however, it is necessary to provide a sufficient fluid pressure. This can be done, for example, by a pump arranged for example in a transmission through the electric machine 36 over the component removed as a hollow shaft 54 is driven, at first not yet existing fluid pressure and consequently not engaged wet running multi-plate clutch 18 , If there is sufficient fluid pressure, then the engagement state of the two clutches 48 . 18 be obtained and the internal combustion engine to be started. Alternatively, it is also possible to associate such a pump with a separate electromotive drive, which may be dimensioned smaller than the electric machine 36 which is especially in a starting phase 24 can contribute to a considerable relief of an on-board system.

Finally, it should be noted that the number of lamellae of the two disk packs, as shown in 5 are only examples. Of course, the two disk packs may also have more or less than the slats shown. In particular, it could also be provided that in at least one of the disk packs only one blade is present.

Claims (17)

Drive system for a vehicle, comprising: - a wet-running multi-plate clutch ( 18 ) for selectively producing a torque transmission connection between a drive member ( 14 ) and an output member ( 16 ), wherein the wet-running multi-plate clutch ( 18 ) an entrance area ( 20 ) with a drive-side plate pack ( 60 ) and an output area ( 22 ) with a driven-side plate pack ( 52 ), - a rotor assembly ( 38 ) an electric machine ( 36 ), which coincide with the exit area ( 22 ) of the wet-running multi-plate clutch ( 18 ), - an interruption clutch arrangement ( 26 ) with one with the drive member ( 14 ) to be coupled input area ( 32 ) and one with the entrance area ( 20 ) of the wet-running multi-plate clutch ( 18 ) coupled output area ( 34 ). Drive system according to Claim 1, characterized in that the interruption clutch arrangement ( 26 ) a form-locking coupling ( 48 ). Drive system according to claim 2, characterized in that the form-locking coupling ( 48 ) is biased in the direction of canceling the positive connection. Drive system according to claim 2 or 3, characterized in that the input area ( 32 ) of the form-locking coupling ( 48 ) and the output area ( 34 ) of the form-locking coupling ( 48 ) engageable in Drehkopplungseingriff gears ( 82 . 80 ). Drive system according to claim 4, characterized in that the output region ( 34 ) of the form-locking coupling ( 48 ) an axially displaceable for producing and canceling the Drehkopplungseingriff gear element ( 74 ). Drive system according to claim 3 and claim 5, characterized in that the toothed element ( 74 ) is biased in the direction of canceling the Drehkopplungseingriffs. Drive system according to claim 6, characterized in that the toothed element ( 74 ) this against the bias in the direction of producing the Drehkopplungseingriffs acted upon loading member ( 92 ) assigned. Drive system according to one of claims 2 to 7, characterized in that the form-locking coupling ( 48 ) a synchronization arrangement ( 60 ) assigned. Drive system according to claim 4 and claim 8, characterized in that the synchronization arrangement ( 66 ) at the entrance area ( 32 ) and the exit area ( 34 ) of the form-locking coupling ( 48 ) Synchronizing friction surfaces ( 90 . 88 ), which upon adjustment of the form-locking coupling ( 48 ) in the direction of producing the positive connection before producing the positive connection frictionally engage. Drive system according to one of claims 1 to 9, characterized in that the wet-running multi-plate clutch ( 18 ) one the disk packs ( 52 . 60 ) in a frictional engagement. 94 ). Drive system according to claim 10, characterized in that the loading member ( 94 ) of the wet-running multi-plate clutch ( 18 ) is biased towards disengagement. Drive system according to claim 7 and 11, characterized in that the loading members ( 92 . 94 ) can be acted upon by fluid pressure against the respective bias voltage. Drive system according to claim 12, characterized in that the wet-running multi-plate clutch ( 18 ) and the form-locking coupling ( 48 ) each because a pressure fluid space ( 98 . 96 ) for the admission of the respective body ( 94 . 92 ) pressurizing pressurized fluid. Drive system according to claim 13, characterized in that the pressure fluid space ( 98 ) of the wet-running multi-plate clutch ( 18 ) and the pressure fluid space ( 96 ) of the form-locking coupling ( 48 ) communicate with each other and via a common pressure fluid feed line ( 102 ) can be fed with pressurized fluid. Drive system according to claim 14, characterized in that on the one hand the on the loading member ( 94 ) of the wet-running multi-plate clutch ( 18 ) acting bias and on this Beaufschlagungsorgan ( 94 ) acting pressure fluid force are matched to one another and on the other hand, the on the Beaufschlagungsorgan ( 92 ) of the form-locking coupling ( 48 ) acting bias and on this Beaufschlagungsorgan ( 92 ) acting pressure fluid force matched to one another such that when increasing the fluid pressure, first the positive coupling ( 48 ) in a state with established positive connection between the input area ( 32 ) and exit area ( 34 ) is brought and with further increasing fluid pressure, the wet-running multi-plate clutch ( 18 ) is brought into an at least partially engaged state. Drive system according to one of the preceding claims, characterized in that the input area ( 32 ) of the interruption clutch arrangement ( 26 ) with a secondary side ( 30 ) of a torsional vibration damper arrangement ( 24 ) and that a primary side ( 28 ) of the torsional vibration damper arrangement ( 24 ) to the drive member ( 14 ) is to be coupled. Drive system according to one of the preceding claims, characterized in that the rotor arrangement ( 38 ) of the electric machine ( 36 ) and a stator assembly ( 56 ) of the electric machine ( 36 ) the wet-running multi-plate clutch ( 18 ) and the interruption clutch arrangement ( 26 ) are arranged radially outside surrounding.