EP3649361A1

EP3649361A1 - Flywheel starting clutch assembly, torsional damper assembly and motor vehicle

Info

Publication number: EP3649361A1
Application number: EP18735187.9A
Authority: EP
Inventors: Monika Rössner; Gerald Viernekes; Alessio Paone; Axel Rohm; Alexander Bartha; Michael KUNTH; Guido Schmitt; Wolfgang Kundermann; Stephan Stroph; Thomas Riedisser
Original assignee: ZF Friedrichshafen AG
Current assignee: ZF Friedrichshafen AG
Priority date: 2017-07-03
Filing date: 2018-06-06
Publication date: 2020-05-13
Also published as: WO2019007619A1; DE102017211260B4; DE102017211260A1

Abstract

The invention relates to a flywheel starting clutch assembly (3) for a motor vehicle, comprising at least a dog clutch (10), wherein the dog clutch (10) can be actuated with an actuating piston (30), characterized in that the actuating piston (30) is formed as a dog element of the dog clutch (10). The invention also relates to a torsional damper assembly. The invention further relates to a motor vehicle.

Description

Flywheel clutch assembly, torsion damper assembly and motor vehicle

The invention relates to a flywheel start clutch arrangement for a motor vehicle with at least one dog clutch, wherein the dog clutch can be actuated with an actuating piston.

Torsionsdämpferanordnungen, for example, dual-mass flywheels, found in the drive train of a motor vehicle for damping torsional vibrations. These can be combined with centrifugal pendulums, it can also be used several torsion damper in a drive train.

In hybrid powertrains, there is a problem that a torsional damper assembly connected to the engine is to be accelerated in an electric motor operation for starting the engine with the engine. Accordingly, the electric motor must maintain a corresponding power reserve.

Therefore, it is known to provide a flywheel starting clutch in front of the torsion damper arrangement, so that the internal combustion engine can be decoupled from the drive train during electromotive operation, but the torsion damper arrangement can be used as flywheel mass and energy store.

In such structures, however, a lot of space in axial length is claimed.

Proceeding from this, it is an object of the present invention to provide a flywheel starting arrangement, with which in a hybridized drive train in the axial direction space can be saved.

To solve this problem, it is proposed that the actuating piston is designed as a claw element of the dog clutch. This allows a component and thus space can be saved in the axial direction. Preferably, the torsion damper assembly can receive the flystart clutch assembly. As a result, for example, saved from the outset at least a portion of the housing of the flywheel clutch assembly and thus axial space can be obtained.

Preferably, the torsion damper assembly may be formed as a dual mass flywheel. A dual-mass flywheel differs from other torsion damper arrangements in particular in the ratio of the masses of primary and secondary side.

Advantageously, the flywheel start clutch assembly may include a friction clutch and a dog clutch. In this case, the friction clutch may be designed so that it can lift only a part of these negative moments, and thus allows a smooth edge change of the dog teeth. Alternatively, the friction clutch can advantageously be designed so that it alone can transmit the entire negative torque in the pulling direction and the dog clutch can take over the remaining torque in the pulling direction. For example, with negative torques in the direction of pull of 600 Nm, the friction clutch can lift it alone or be designed, for example, to 700 Nm, so that a safety reserve is available. If the maximum torque in the pulling direction is 2,000 Nm, the dog clutch is designed so that it can transfer 1,400 Nm. The positive torque in the pulling direction is therefore transmitted together when the 700 Nm is exceeded by both clutches, while the negative torques can be taken over by the friction clutch alone. As a result, in particular rattling noises on the dog clutch can be avoided.

If the friction clutch is designed with negative torque of 600 Nm to 400 Nm or 500 Nm, the dog clutch must take over the remaining negative moments, but then rattle noise of the dog clutch are excluded here, because the edge change of the claw, damped by the parallel friction clutch becomes. Advantageously, the flywheel clutch assembly may include an actuator having at least two actuating pistons. The flywheel clutch assembly accordingly has a wet-running operation. Since the clutch or clutches of the flywheel clutch assembly are arranged in the wet space of the torsion damper assembly, the clutches are accordingly also wet running.

As a piston are basically understood all parts of the operation that follow the pressure chamber. An actuating piston can therefore be designed in several parts. Preferably, however, it is designed in one piece.

Quite generally, the flywheel clutch assembly comprises at least one clutch, which may be basically wet or dry running. The use of two pistons results only when using at least two clutches. Even then, the embodiment or combination of a friction clutch and a dog clutch is a preferred embodiment, for example, a friction clutch and a freewheel or other variations are conceivable.

Advantageously, a jaw member of a dog clutch may be formed on one of the pistons. Accordingly, one of the clutches is designed as a dog clutch. Due to the design of the claw element on the piston, two functions can be combined on one component, whereby a compact design can be realized.

Furthermore, a friction surface of the friction clutch may be formed on one of the pistons. Then, the other piston is formed as part of the coupling, which in turn a plurality of functions are formed on a single component. As a result, the number of components can already be reduced at these points. This can be done independently of the design of the other piston.

Preferably, the actuating device may have a single supply line. This is also the case when the flywheel clutch assembly has several Couplings has. These are namely not independent of each other to operate, but yes, the clutches are indeed transmitted together the positive torques in the pulling direction. Accordingly, the actuation takes place, with normally-opened clutches the engagement and with normally-closed clutches the disengagement, according to a predeterminable pattern. Accordingly, the pressurized areas of the actuating pistons may have a predetermined ratio that is selected in dependence on at least one biasing element. In normally-opened couplings, biasing elements may be present to bring the couplings into a defined home position. When engaging, this biasing force is overcome. This can be designed differently for the individual clutches. By selecting the pressurized surfaces then quite defined engagement conditions can be selected in which the respective other clutch is engaged. For example, the friction clutch may be engaged first. If it then already transmits a defined torque in slip mode, the dog clutch is engaged. This moment can be precisely defined by the selection of the pressure surfaces. Thus, therefore, the dog clutch can be engaged depending on the engagement state of the friction clutch.

Upon disengagement, in this example, the friction clutch is the one that remains closed longer. This is advantageous because it allows a jerk-free disengagement.

This always applies if the friction clutch is engaged first regardless of whether the clutches are designed as normally-opened clutches or normally-closed clutches. In a mixed training of the couplings can be achieved the same procedure, even if a clutch to engage and the other to operate to disengage.

Advantageously, the friction surface may be formed as a friction cone. This piston may preferably be used or arranged on the output side of the friction clutch. On the input side of the friction clutch may advantageously be arranged a friction element that is connected to one or the input hub. In particular, the friction element may be a lamella. The friction clutch preferably has a single lamella. Then the friction clutch is formed as a kind of single-disc friction clutch, the clutch disc is extremely simple.

Advantageously, the friction surface on the piston is cone-shaped. Accordingly, the friction element, in particular the lamella, is then arranged obliquely.

Advantageously, a part of the housing of the torsion damper assembly is a friction surface of the friction clutch. In particular, this part of the housing can be located on the output side of the friction clutch and at the same time belong to the primary side of the Torsionsdämpferanordnung.

Advantageously, the actuating device can have a single supply line. This makes it possible that the actuator is charged via the transmission input shaft with oil. As a result, expensive lines for the oil of the actuator can be avoided.

Advantageously, the pistons can be mounted on an intermediate wall of the torsion damper arrangement. In a further development, the oil supply can also be formed on this intermediate wall. In contrast to the usual procedure, namely to arrange the pressure chamber and the piston on existing components of the clutch, it is advantageous in a flywheel clutch assembly, if this has a larger flywheel. Accordingly, the additional partition is connected to the Torsionsdämpferanordnung. Conversely, connecting to the hub or hubs on the input side would only increase the weight of the flywheel clutch assembly. But so the flywheel can be increased. At the same speed while a larger rotational energy can be stored. Preferably, the intermediate wall between the primary side and the secondary side may be arranged. At this point, the most space-saving installation is possible.

Advantageously, the intermediate wall can be supported on an input hub. The support can be done via two sealing elements, in particular radial shaft seals or rectangular sealing rings. Then, at this point, the supply of oil in the partition can be done.

The intermediate wall may have at least one passage opening for oil. Then cooling oil of the couplings can be forwarded. The at least one passage opening is preferably arranged radially outside the clutch or couplings of the fly-starting clutch arrangement. Then the oil is guided by the prevailing centrifugal forces to the openings.

The pistons can be arranged on the same side of the torsion damper arrangement, in particular on the same side of the intermediate wall. The engagement movement can take place towards the housing or towards the interior of the torsion damper arrangement. Preferably, a movement towards the housing. This results in an extremely space-saving design.

Alternatively, the pistons may be arranged on different sides of the intermediate wall. In this structure, it is possible to design the input hub in two parts, whereby the friction clutch and the dog clutch can be decoupled. This is possible with an arrangement of both pistons on the same side with less effort.

As described, the intermediate wall is preferably connected to the primary side of the torsion damper arrangement. More preferably, the fly-starting clutch arrangement is preferably arranged between the primary side and the secondary side of the torsion damper arrangement. In this case, the primary side of the torsion damper assembly form part of the housing of the torsion damper assembly. Advantageously, the actuating device can have a single pressure chamber. As already described, the engagement of the clutches can be designed via the design of the pressurized surfaces. Then a single pressure chamber is sufficient, so valves for controlling the pressure chambers can be omitted.

Preferably, the torsion damper assembly may have two input hubs. As already described, the couplings can thereby be decoupled.

Advantageously, all of the torque can be transmitted via the flywheel clutch assembly. Of course, this is only possible if the torsion damper assembly is installed and transmits torque. Accordingly, the structure is such that all the torque is transferable via the fly-starting clutch assembly.

Advantageously, the actuator assembly of the flywheel clutch assembly may form part of the flywheel assembly of the torsion damper assembly.

As a result, as described, the storable rotational energy can be increased. This results, for example, when the intermediate wall of the primary side of the torsion damper assembly is connected and the actuating arrangement is formed in the intermediate wall.

Preferably, the primary side of the torsion damper assembly may be supported on an input hub of the flywheel clutch assembly. In this case, the primary side forms part of the housing of the torsion damper assembly, which again space is saved in the axial direction.

Advantageously, the dog clutch may be formed as a radial claw clutch. This means that the teeth of the dog clutch point in the radial direction.

Preferably, at least one clutch of the flywheel clutch assembly may be formed as a normally-opened clutch. Preferably, both clutches of the flywheel clutch assembly may be normally-opened clutches be educated. This is advantageous when the motor vehicle is approached via the electric motor and accordingly emits no moment at the start of the motor vehicle, the engine. Then there is no actuating pressure available to open the clutches. Thus, an additional pumping device can be avoided.

In addition, the invention relates to a motor vehicle with a Torsionsdämpferanordnung. The motor vehicle is characterized in that the torsion damper arrangement is designed as described.

Further advantages, features and details of the invention will become apparent from the following description of exemplary embodiments and figures. Show.

1 shows a drive train;

2 shows a torsion damper arrangement in a first embodiment, and FIG. 3 shows a torsion damper arrangement in a second embodiment.

FIG. 1 shows a drive train 1 with an internal combustion engine 2, a

Flywheel clutch assembly 3, a flywheel device 4, a clutch 5, an electric motor 6 and a transmission 7. The electric motor 6 can be configured as a single electric motor or as series-connected electric motors, it is essential here that the electric motor 6 in front of the transmission 7 on the drive train attacks.

The flywheel clutch assembly 3 is characterized by its position in front of the flywheel device 4. This is due to the particular function of the flywheel clutch assembly 3, which only serves for the high travel of the internal combustion engine 2 and otherwise transmits the torque of the internal combustion engine 2. By providing the swing start clutch assembly 3, it is possible to design the electric motor 6 with lower power reserves, thereby this is cheaper to produce. In this case, the flywheel clutch assembly 3 separates the engine 2 from the remainder of the drive train in purely electronic operation, the electric motor 6 thus drives the flywheel device 4 as an energy store in purely electric motor operation. The additional power which the electric motor 6 has to apply for this purpose in purely electromotive operation, however, is less than the power reserve that would be required if the electric motor 6 had to accelerate not only this but also the flywheel device 4 for starting the internal combustion engine.

Overall, therefore, to provide slightly more power during operation of the electric motor 6 to keep the flywheel device 4 running. For the electric motor 6 but can be designed to be weaker overall, since the energy stored in the flywheel device 4 can then be used to start the engine 2.

In particular, the fly-starting clutch assembly 3 is not a starting clutch since it is not used to move the motor vehicle. Regardless of whether or not the motor vehicle is already in motion, the fly-starting clutch assembly 3 merely serves to start the engine 2. It is therefore interpreted by the interpretation forth, for example, in relation to the removal of heat differently interpretable as a starting clutch. In this respect, the different function, for example, in the amount of material of the pressure plate noticeable.

FIG. 2 shows a torsion damper arrangement 8 as a flywheel device 4. The flywheel start coupling arrangement 3 is arranged inside the torsion damper arrangement 8 and therefore also inside the flywheel device 4.

The swing start clutch arrangement 3 comprises a friction clutch 9 and a dog clutch 10. Through the structure explained in more detail below, most of the parts of the swing start clutch arrangement 3 form part of the flywheel device 4. This therefore consists of the torsion damper arrangement 8 and parts of the swing start clutch arrangement 3. Beginning on the input side of the flywheel clutch assembly 3 are in the embodiment of Figure 2, two input hubs 12 and 14. By the input hubs 12 and 14, the torque can be divided and thus the dog clutch 10 are protected against torque changes. The input hubs 12 and 14 can be screwed to the crankshaft 16 as shown in FIG. 2, but they can also be positively connected to the crankshaft via a serration. Still alternatively, the input hubs 12 and 14 may be connected to the crankshaft via a plate assembly. In this case, the crankshaft can be screwed to a first plate and this with a second, which in turn is connected to the two input hubs. This results in an axially elastic connection between the crankshaft and the input hubs 12 and 14.

With the input hub 12 is connected as a friction member 18, a blade. This is attached to a hub shield of the input hub 12. The input side of the friction clutch 9 accordingly includes the input hub 12 with hub shield and the blade 18th

To actuate the friction clutch 9 and the dog clutch 10, the Torsionsdämpferanordnung 8 an actuator 19.

The output side of the friction clutch 9, in addition to the actuating piston 20 as part of the actuator 19 and the housing part 22 on. The housing part 22 is at the same time the primary part of the torsion damper arrangement 8. Advantageously, the friction surface 24 can be arranged on the housing part 22 in the oblique part, in particular on a crank 26.

Saving the component, the actuating piston 20 comprises a friction cone 28, which is also arranged on the output side. The friction clutch 9 is accordingly designed as a single-disc friction clutch, wherein the clutch disc is formed as a lamella and the output-side friction partners are formed on the one hand on the actuating piston 20 and the other on the housing part 22. Accordingly the output side of the friction clutch 9 is realized exclusively by already existing on the torsion damper or on the actuator components.

The input hub 14 forms the input of the dog clutch 10, wherein the actuating piston 30 is also the jaw member of the dog clutch 10. The jaw clutch 10 is designed as a radial claw clutch, which is why the teeth 32 and 34 are formed in the radial direction. The counter teeth 36 and 38 are on the one hand on the input hub 14 and on the output hub on the intermediate wall 40. The intermediate wall 40 supports the actuating piston 20 and 30, while it is connected to the housing part 22.

In addition, a portion of the supply line 42 passes through the intermediate wall 40, wherein both pistons 20 and 30 are actuated by the single supply line 42. The pressurized surfaces 44 and 46 are selected as a function of the biasing elements 48 and 50, so that the engagement of the dog clutch 10 can be done for example in a defined engagement state of the friction clutch 9. For this, the actuating surface 44 of the friction clutch 9 is larger and, for example, the force of the biasing member 48 is smaller, so that the friction clutch 9 is first engaged. Only when a defined engagement state of the friction clutch 9, the force of the biasing member 50 is then overcome, so that the dog clutch 10 is engaged. The biasing elements 48 and 50 are preferably designed as tension springs, so that the friction clutch 9 and the dog clutch 10 are formed as normally-opened couplings.

In the embodiment shown, the intermediate wall 40 and the actuating piston 20 and 30 form part of the flywheel device 4. So they belong to the rotational energy storing mass, which is held rotating by the electric motor 6, while the engine is decoupled.

Only the input hubs 12 and 14 and the friction element 18 are connected to the crankshaft 16 and thus to the engine 2. Only these parts are therefore not part of the flywheel device 4. On the secondary side, the torsion damper arrangement 8 has a secondary element 52 which also forms the output of the torsion damper arrangement 8. This is enclosed by the housing part 54, which is connected to the housing part 22. The housing part 22 is supported by means of a bearing 56 on the input hub 12. Further thrust bearings 58 separate the intermediate wall 40 from the input hubs 12 and 14.

The housing parts 22 and 54 enclose a wet space, wherein the torsion damper assembly 8 and the friction clutch 9 and the dog clutch 1 0 are designed to run wet.

At the output of the torsion damper assembly 8, a centrifugal pendulum is arranged. A second torsion damper arrangement also follows before the separating clutch 5. These are therefore arranged in the diagram according to FIG. 1 between the flywheel mass device 4 and the separating clutch 5.

FIG. 3 shows a further embodiment of the torsion damper arrangement 8. In contrast to FIG. 2, the actuating pistons 20 and 30 are arranged on the same side of the intermediate wall 40, which is why only a single input hub 16 is present. But the intermediate wall 40 is still connected to the housing part 22 and thus to the primary side and a part of the friction clutch 9 is formed by the housing part 22 and by the actuating piston 20 as already described for Figure 2.

Apart from the equilateral arrangement of the actuating piston 20 and 30 and the reduction of the number of input hubs, the statements on FIG. 2 can otherwise be transferred to FIG. The same reference numerals designate functionally the same components. Bezuaszeichen drive train

internal combustion engine

Flywheel clutch assembly Flywheel device

separating clutch

electric motor

transmission

torsional damper

friction clutch

claw clutch

input hub

crankshaft

friction

actuator

actuating piston

housing part

friction surface

cranking

friction cone

actuating piston

gearing

counter teeth

partition

supply

surface

biasing member

biasing member Secondary element housing part bearing

Thrust bearing input hub

Claims

claims

1 . Flywheel clutch assembly (3) for a motor vehicle having at least one dog clutch (10), wherein the dog clutch (10) with an actuating piston (30) is actuated, characterized in that the actuating piston (30) is formed as a claw member of the dog clutch (10).

Second flywheel clutch assembly according to claim 1, characterized in that the fly start clutch assembly (3) comprises a friction clutch (9) and a dog clutch (10).

Third flywheel clutch assembly according to claim 2, characterized in that the friction clutch (9) with an actuating piston (20) is actuated and on the actuating piston (20) of the friction clutch, a friction surface, in particular a friction cone (28) is formed.

4. flywheel clutch assembly according to one of the preceding claims, characterized in that the fly-starting clutch assembly (3) comprises an actuating device (19) with at least two actuating pistons (20, 30).

5. flywheel clutch assembly according to claim 4, characterized in that the actuating piston (20, 30) are sealed with two sealing rings.

6. flywheel clutch assembly according to one of claims 4 to 5, characterized in that the actuating device has a single supply line (42).

7. flywheel clutch assembly according to one of claims 4 to 6, characterized in that the pistons (20, 30) are mounted on an intermediate wall (40) in the Torsionsdämpferanordnung (8).

8. flywheel clutch assembly according to one of claims 4 to 7, characterized in that the pistons (20, 30) on the same side of Torsionsdämp- feranordnung (8), in particular on the same side of the intermediate wall (40) are arranged.

9. fly-start clutch assembly according to one of claims 4 to 7, characterized in that the pistons (20, 30) on opposite sides of the intermediate wall (40) are arranged.

10. flywheel clutch assembly according to one of claims 4 to 9, characterized in that the intermediate wall (40) with the primary side of the torsion damper assembly (8) is connected.

1 1. Flywheel clutch assembly according to one of claims 4 to 10, characterized in that the pressurized surfaces (44, 46) of the pistons (20, 30) have a predetermined ratio, which are selected in dependence on at least one biasing member (48, 50).

12. Flywheel clutch assembly according to one of claims 3 to 1 1, characterized in that the actuating device (19) has a single pressure chamber (42).

13. Flywheel clutch assembly according to one of the preceding claims, characterized in that the flywheel clutch assembly (3) within a flywheel device, in particular a Torsionsdämpferanordnung (8) is arranged.

14. Flywheel clutch assembly according to claim 13, characterized in that a part of the housing (22) of the torsion damper assembly (8) is a friction surface (24) of a friction clutch (9) of the flywheel clutch assembly (3).

15, flywheel clutch assembly according to one of claims 13 or 14, characterized in that the actuating device (19) of the fly starting clutch assembly (3) forms part of the flywheel of the torsion damper assembly (8).

16. Flywheel clutch assembly according to one of claims 13 to 15, characterized in that the fly start clutch assembly within the housing (22, 54) of the torsion damper assembly (8) is arranged.

17. Flywheel clutch assembly according to one of claims 13 to 16, characterized in that the Torsionsdämpferanordnung (8) includes a wet space.

18. Flywheel clutch assembly according to one of the preceding claims, characterized in that the fly-starting clutch assembly (3) has two input hubs (12, 14).

19. Flywheel clutch assembly according to one of claims 1 to 17, characterized in that the fly start clutch assembly (3) has exactly one input hub (60).

20. Flywheel clutch assembly according to one of the preceding claims, characterized in that the entire torque via the flywheel clutch assembly (3) is transferable.

21. Flywheel clutch assembly according to one of the preceding claims, characterized in that a friction element (18) of a friction clutch (9) of the flywheel clutch assembly (3) rotatably connected to an input hub (12, 14, 60) is connected.

22. Flywheel clutch assembly according to claim 17, characterized in that the friction element (18) is designed as a friction plate.

A torsional damper assembly having a flywheel starting clutch assembly (3), characterized in that the flywheel starting clutch assembly (3) is arranged according to any one of the preceding claims.

24. Motor vehicle with a Torsionsdämpferanordnung (8), characterized in that the Torsionsdämpferanordnung (8) is designed according to claim 23.