WO2008077378A1

WO2008077378A1 - Power transmission device and bearing disk, especially axial plain bearing washer

Info

Publication number: WO2008077378A1
Application number: PCT/DE2007/002256
Authority: WO
Inventors: Stephan Maienschein; Bruno MÜLLER
Original assignee: Luk Lamellen Und Kupplungsbau Beteiligungs Kg
Priority date: 2006-12-27
Filing date: 2007-12-13
Publication date: 2008-07-03
Also published as: DE112007002931A5

Abstract

The invention relates to a power transmission device (1) to be arranged in a drive train between a driving engine and a transmission, comprising an input (E) and an output (A), a hydrodynamic component (2) interposed between the input and the output and comprising a turbine wheel that can at least be indirectly coupled to the output, and a bearing assembly (19) for bearing the output on the input and further a bearing washer (22). The invention is characterized in that the bearing assembly comprises an axial plain bearing (20) which comprises a disk-shaped element that is interposed between the input and the output in the axial direction, that is non-rotatably connected to the input and that configures a bearing washer.

Description

Kraftübertragungsvorrichtunq and bearing plate, in particular thrust washer

The invention relates to a power transmission device, in detail with the features of the preamble of claim 1; Further, a bearing disc for a power transmission device.

Power transmission devices for arrangement in a drive train between an engine and a transmission with a hydrodynamic and a mechanical power branch are known in a variety of embodiments of the prior art, being distinguished between versions in two- and three-channel design. These include an input which can be coupled at least indirectly with a drive machine and at least one output which is connected to an output and designed as a transmission input shaft. The power transmission device comprises at least one hydrodynamic component and a device for the at least partial bridging of the hydrodynamic power branch, which is generally designed as a so-called lock-up clutch in the form of a switchable and friction-based coupling. The hydrodynamic component is designed either as a hydrodynamic speed / torque converter or hydrodynamic clutch. This comprises at least one impeller and a turbine wheel, wherein the impeller is at least indirectly rotatably coupled to the input of the power transmission device, while the turbine wheel is at least indirectly rotatably connected to the output of the power transmission device. At least indirectly always means either directly or via further connection or transmission elements. The lock-up clutch comprises at least a first coupling part, which is non-rotatably coupled to the input, and with a second non-rotatably coupled to the output coupling part can be brought into operative connection by means of a pressurizable piston element. If the pressurizable chamber pressure chamber formed by the interior of the power transmission device, the piston position is adjusted by controlling the pressure difference between the converter internal pressure and the interior. Such a design in two-channel construction is described, for example, in DE 10 2004 010 262 A1, which is flowed through centripetally or centrifugally, depending on the direction of flow. In this embodiment, the piston element is guided displaceably on the turbine wheel in the axial direction. In order to avoid an undesired accumulation of operating medium in the area of the return bores, means are provided in all embodiments which approximate the radiusspecific rotational flow velocity of the operating means to the radiusspecific peripheral speed of the converter housing. These are provided in an embodiment in a thrust washer for the turbine wheel on the housing, wherein the thrust washer is arranged on the non-rotatably coupled to the turbine wheel and the transmission input shaft hub member. The corresponding channels are formed on the facing the inner circumference of the housing end face of the thrust washer. The thrust washer is displaceably mounted in the axial direction and serves to support the inner circumference of the housing, which is formed by the impeller shell and a cover element coupled thereto.

When running in three-channel design, the pressurization of the piston element via a targeted with a pressure or control means, usually acted upon oil chamber, wherein the pressure is independent of the pressure in the other two pressure chambers of the power transmission device is adjustable. The acted upon with pressure medium chamber is thereby formed by the housing and the piston member by the pressure and liquid-tight guide on the housing. The output, in particular the transmission input shaft of a downstream transmission unit, is supported via a bearing arrangement on the housing part forming the input and connected to the impeller, in particular a hub element connected in a rotationally fixed manner to the latter, the bearing arrangement comprising a radial bearing for this purpose. The piston element is guided on the housing, in particular in the region of its inner circumference on the hub member displaceable in the axial direction. In order to prevent rotation of the piston element relative to the cover due to its inertial forces in motor excitation and thus a possible wear of the piston seals, the piston element is secured in the lid hub positively against rotation. In addition to the provision of the cover hub, this necessitates the provision of corresponding connection channels for the supply of the pressure chamber by the hub element as well as complementarily designed anti-twist elements on the piston element and the hub. The production and assembly is carried out as accurately as possible, in order to achieve any tensions and to ensure safe guidance of the piston element.

The invention is therefore based on the object, a power transmission device, in particular an embodiment in three-channel design further such that the manufacturing and assembly effort is reduced, the structure overall while ensuring safe operation, in particular rotation of the piston member against the inner wall of the housing should be simplified.

The solution according to the invention is characterized by the features of claims 1 and 23. Advantageous embodiments are described in the subclaims. A power transmission device for arrangement in a drive train between a prime mover and a transmission, comprising an input and an output, a hydrodynamic component arranged between input and output with a turbine wheel which can be indirectly coupled to the output and a bearing arrangement for supporting the output at the input, is according to the invention Characterized in that the bearing arrangement has an axial sliding bearing, comprising a between the input and output in the axial direction and with the input rotatably connected, a bearing disc forming disk-shaped element. As a result, a cost and production technology very simple and space-saving design of a bearing assembly for axial support of the output, in particular a hub part, which is rotatably connected to the output, realized to the input, in particular coupled to this housing.

The input of the power transmission device is preferably formed by a housing part of a rotatably coupled to a pump impeller of the hydrodynamic component, the turbine wheel in the radial and axial direction to form an interior enclosing housing. The disc-shaped element is arranged rotationally fixed on a surface facing the hydrodynamic component in the axial direction surface area on the inner wall of the housing. The housing part can be manufactured as a cup-shaped element in a simple manner as a deep-drawn part, wherein the surface area to be provided as a contact surface for the disk-shaped element does not have to meet any special requirements, since there is no relative movement in the circumferential direction between it and the disk-shaped element.

The connection between the bearing disk and the housing, in particular deckeiförmigem element can be made detachable or insoluble. The first option offers the advantage of a simple exchange. The non-rotatable connection of the input with the disk-shaped element takes place positively or positively. When choosing the connecting elements and their arrangement, however, it should be noted that they do not enforce the support surface if possible. For this purpose, preferably projections are provided on the outer circumference of the disk-shaped element in the radial direction and form fastening regions, in the region of which fastening takes place, wherein the individual fastening region lies outside the support region for the output. The attachment areas are preferably designed flange-like and preferably allow the passage of fasteners. The possibility of a permanent connection includes a material bond, in which case no additional measures are to be taken on the bearing disk, since the material connection does not affect the support area depending on the design.

The non-rotatable coupling of the turbine wheel takes place with the output via a non-rotatably connected to the output, in a particular embodiment, however, in the axial direction relative to this displaceable hub member, wherein the disc-shaped element between the input and the hub member is arranged. The turbine wheel is either directly connected via the turbine hub with the transmission input shaft or another hub element arranged between a turbine and output device for damping vibrations comprising a non-rotatably coupled to the turbine wheel acting as an input part primary part and a non-rotatably connected to the output as the output part functioning Secondary part, which are rotatable in the circumferential direction limited relative to each other and are connected to each other via means for spring and / or damping coupling, wherein the secondary part is connected via the hub member to the output. The hub member is then preferably designed as a one-piece hub member and also serves to guide an adjusting device of a switchable coupling device in the axial direction.

The power transmission device further comprises at least one switchable coupling device with a pressurizable means having a piston element having actuating device, wherein the piston member at the outlet pressure and liquid-tight and slidably guided in the axial direction and free of a rotationally fixed connection with this. The piston element is thereby displaceable in the axial direction on the housing in the region of its outer circumference and in the region of its inner circumference at the exit or a member rotatably coupled thereto in the axial direction and pressure and liquid tight guided to form a pressurizable medium. The pressure space thus formed between the housing and the piston element is pressureless and fluid-tight to the free impact with pressure medium relative to the interior of the power transmission device and a hydrodynamic component. Between the piston member and the input an anti-rotation is provided to speed differences, caused by the inertia of excitation by the prime mover between the piston member and acting as an input of the power transmission device rotatable and co-rotating housing, and thus to be acted upon to seal the pressurized medium with respect to the Interior of the power transmission device required to conserve sealing devices. However, the rotation allows a relative movement in the axial direction. The rotation can be realized in different ways. Are conceivable separate from the bearing disc independent solutions or with this a structural unit forming solutions. Both have in common that they produce at least one rotationally fixed connection between the disk-shaped element and the piston element.

The rotationally fixed connection can be executed as a positive or non-positive connection. Preferably, to increase the functional concentration and reduce the number of components, the anti-rotation device or at least a part of this is formed on the disk-shaped element. For this purpose, this comprises at least one, preferably a plurality of projections aligned in the axial direction and forming an anti-rotation region, which engage in complementary recesses on the piston element, in particular in the region of the radially inner region of the piston element forming a hub region.

The anti-rotation device may further comprise at least one protrusion oriented on the disk-shaped element in the axial direction and forming an anti-rotation area, which has a planar area forming a partial area, which is operatively connected to a flat on an outer periphery forming portion of the piston element complementarily executed planar surface area , In this case, the disk-shaped element in the radial direction surrounds the hub part of the piston element over a partial area in the circumferential direction. For this purpose, complementary contact surfaces are to be provided on the piston element, via which the piston element is defined in its position in the installation position in the circumferential direction relative to the housing.

The anti-rotation portions are formed on projections which are outside the support surface for the output. To avoid imbalances, the disk-shaped element is arranged symmetrically with respect to the axis of rotation of the power transmission device in the installation position, which corresponds to the center axis, preferably also symmetrically with respect to a further second axis extending perpendicular to the center axis. The protrusions forming the anti-rotation portions are alternately arranged circumferentially on the disk-shaped member with protrusions forming the attachment portions.

Since the disc-shaped element in the cooperating with the output area, the support area and the output forms a sliding pair, the surface is formed in this area accordingly wear resistant. The surface is produced by a coating, surface treatment or surface treatment.

Furthermore, the choice of material can be made according to the requirements of the sliding pair and / or the entire component can be cured. The bearing disc used and used according to the invention, in particular axial plain bearing disc for use in power transmission devices between rotating at relative speed connection elements, characterized in that this as a disk-shaped element with a contact surface for rotationally fixed connection with a connection element on a first axial end face and a support surface forming sliding bearing surface area the other end face is executed, comprising means for preventing rotation. The anti-rotation means comprise projections aligned in the axial direction and extending from the face surface forming the slide bearing surface, which projections can be made as desired depending on the configuration of the recesses into which they engage. The single projection can, according to a further embodiment, also describe a flat surface area in the circumferential direction.

The bearing disk itself thus has at least one support region for an end face of the hub element or of the output. In this case, in a corresponding embodiment of the cover element and the hub in the axial direction of a space-optimized arrangement with simultaneous support effect done. The bearing disk itself is not necessarily adapted to a circular contour in terms of their outer contour. Preferably, however, this is designed to avoid any imbalances such that it is symmetrical, the formation of different areas is symmetrical so that the center of gravity is preferably in the region of the axis of rotation when installed in a power transmission device, which corresponds to the center axis of the bearing disc.

The bearing disk has, in addition to the actual support region areas for attachment to the connection element, in particular for rotationally fixed attachment to a cover element of a housing for a power transmission device and according to a very particularly advantageous embodiment also means for realizing a rotation of a piston member relative to the rotatably coupled to the bearing member element. As already stated, these areas are preferably designed symmetrically with respect to the center axis. The regions are preferably arranged alternately viewed in the circumferential direction.

The regions for realizing an anti-twist with the piston element are preferably designed in the axial direction by protrusions extending away from the end face forming the support region. These projections form contact or engagement surfaces for interaction with correspondingly complementary surfaces on the piston element. decision dend is that the areas for realizing the rotation and the rotationally fixed coupling are arranged outside the support area. The support region in this case represents a surface region on the end face. Preferably, the entire end face can be designed as a theoretically possible support region, so that here a bearing disk can also be used for a plurality of different hub designs.

The bearing plate can be designed according to high-strength and wear resistant at least on the effective surface as a sliding surface. This can be done by appropriate surface treatment and / or coating. According to a particularly advantageous embodiment, the entire end faces are also designed with the corresponding surfaces which form the means for preventing rotation in this way. This has the advantage that the bearing disc can be made from a suitably pretreated semifinished product in the form of a sheet metal or the like and produced by forming, is formed according to a particularly advantageous embodiment in a simple manner as a stamped part.

The bearing disk is a wear-resistant bearing element. This can be realized on the one hand by appropriate surface coating or else the entire pane consists of a corresponding selected material with a wear-resistant surface, in particular due to the material or by surface treatment or heat treatment.

The solution according to the invention is particularly suitable for power transmission devices in three-channel construction, i. with a separate piston member associated with the pressure medium and acted upon chamber, but also versions in two-channel design. The power transmission device in both cases comprises a hydrodynamic component comprising at least one impeller and a turbine wheel. Furthermore, at least one stator is provided in a particularly advantageous embodiment with hydrodynamic speed / torque converter.

The solution according to the invention is explained below with reference to figures. The following is shown in detail:

FIG. 1 illustrates, in a schematically simplified representation, a particularly advantageous connection of an axial bearing arrangement designed according to the invention in the form of an axial bearing disk in a power transmission device; Figure 2 illustrates with reference to two views of an embodiment of a bearing disc;

FIG. 3 illustrates an embodiment of a hub part on the piston element for realizing an anti-rotation lock with a bearing disk according to FIG. 2.

FIG. 1 shows in an axial section a force transmission device 1 designed according to the invention. This comprises an input E which can be coupled directly to a drive shaft of a drive unit, ie at least one output A. The output A can be coupled to an output part of a drive train and is formed by a shaft 13, in particular a transmission input shaft. Between the input E and the output A, a hydrodynamic component 2 is arranged. This includes a viewed in power flow direction from the input E to the output A acting as impeller P and connected to the input E paddle wheel and acting as a turbine wheel T and at least indirectly coupled to the output A further paddle wheel. In the case shown, the hydrodynamic component 2 is preferably designed as a hydrodynamic speed / torque converter 3, for which purpose it comprises at least one stator wheel L. This is based on a freewheel F on a stationary or a rotating element, here a support shaft 4 from. The hydrodynamic component 2 enables power transmission in a hydrodynamic power branch. The power transmission device 1 further comprises a device for at least partially bypassing the hydrodynamic power branch, preferably in the form of a bypass clutch 5. This is associated with an adjusting device 6, which is formed in the simplest case in the form of a pressurizable piston element 7. As the pressure medium, the operating medium of the hydrodynamic component 2 is used in the simplest case. The impeller P of the hydrodynamic component 2 is at least indirectly non-rotatably connected to the input E, here via the housing 8. The turbine wheel T is at least indirectly rotatably coupled to the output A. The power transmission device 1 comprises a rotating housing 8. This is rotatably coupled to the impeller P or at least partially formed by the so-called impeller shell 9 connected to the impeller P. The housing 8 may be made in one piece or in several parts. In the simplest case, this comprises a pot-shaped or bell-shaped cover element 10 which is connected in a rotationally fixed manner to the impeller shell 9, which is formed integrally with the impeller P. In this case, the lid member 10 forms either directly the input E or is rotatably coupled thereto. The coupling device 5 is designed as a frictional clutch. This comprises at least a first coupling part 11 and a second coupling part 12, which together for the purpose of power transmission via the adjusting device 6 can be brought into operative connection. The second coupling part 12 is at least indirectly rotatably connected to the output A. The output A is formed for example as a hollow shaft. The coupling takes place via a non-rotatably connected hub 14. The coupling of the second coupling part 12 of the clutch assembly 5 and the turbine wheel T of the hydrodynamic component 2 to the output A, in particular the hub 14, takes place here via a device 15 for damping vibrations. This acts as a flexible coupling and comprises at least one designated in the power flow from the input E to the output A as a primary part 16 input part and in this direction of force flow as a secondary part 17 designated output part, which are limited in the circumferential direction rotatable limited to each other, wherein the primary part 16 with the second coupling part The primary part 16 thus forms in the power flow between input E and output A the input part of the device 15. The secondary part 17 is rotatably connected to the output A, in particular the hub member 14, and forms in the power flow from the input to the output A the output part. Primary part 16 and secondary part 17, which may be made in several parts, are coupled to each other via means 18 for spring and / or damping coupling. Depending on the design of the device 15 for damping vibrations, this may for example be designed as a purely mechanical damper. In this case, the means 18 for spring and / or damping coupling comprise only spring elements which are supported with their two ends respectively on the primary part 16 and the secondary part 17. When designed as a hydraulic damping device, additional damping chambers which can be filled with a hydraulic fluid or a damping medium are preferably provided. Other versions are conceivable.

Between the input E and the output A, a bearing arrangement 19 is provided, which according to the invention comprises at least one thrust bearing 20. This serves to support the output A at least indirectly at the input E, in particular the housing 8 in the axial direction. The thrust bearing 20 is designed as a sliding bearing 21 and comprises at least one disc-shaped element in the form of a bearing plate 22 which is non-rotatably connected to the input E or a rotatably coupled thereto element or a forming element, here the housing 8. There is no possibility of relative movement in the circumferential direction and in the axial direction between the bearing disk 22 and the housing 8 in the form of the cover element 10. The bearing plate 22 and the hub 14 thus form a pairing 23, in particular between a support surface 26 provided on the side facing away from the cover element 10 end face 24 surface area of the bearing plate 22 and a facing this end face 25 at the output A, here the hub 14. Die individual elements of the sliding pair 23 are matched to one another. The load gerscheibe 22 is designed as a highly wear-resistant component and is preferably made of aluminum or bronze, other designs are conceivable. In this case, the area acting as a sliding surface of the sliding pair 23 or support surface 26 or the surface area on the end face 24 may also be provided with a coating or be surface treated accordingly. The embodiment of the invention has the advantage that no additional hub for support on the cover element 10 must be provided and this can thus be made relatively simple in terms of structural design, especially as a simple thermoforming component or by another type of sheet metal forming can be produced. The assignment of the bearing plate 22 takes place here for the cover element 10 and this is interchangeable in a simple manner.

At the other end face 47, the disk-shaped element in the form of the bearing disk 22 has at least one contact surface 48 for engagement with the input E, in particular an inner wall region of the housing 8, in particular of the cover element 10. The non-rotatable attachment is preferably in attachment areas 49th

This is used in training the power transmission device 1 in three-channel design with guided at the output piston element 7 simultaneously as part of a rotation 27 to prevent rotation of the piston member relative to the housing 8, in particular the cover member 10th For this purpose, the bearing disk 22 has means which are designated by 28 and are part of an anti-rotation device 27 in cooperation with means 29 on the piston element 7. In the simplest case, the means 28 comprise means for realizing a positive connection between the piston element 7 and the bearing plate 22. In the illustrated case, these comprise at least one, preferably two, projections 30.1 and 30.2 formed in the axial direction, which cooperate with the piston element 7 to form a positive connection , wherein the piston member 7 relative to this is displaceable in the axial direction. In the illustrated case, the projections 30.1 and 30.2 each form a contact surface 31.1, 31.2 which is characterized at least by a directional component at an angle to the circumferential direction. This cooperates with a mounting position for this facing surface 32.1 or 32.2 on the piston element 7. As a result, a positive connection is ensured in the circumferential direction or in the radial direction, in the axial direction a displacement is possible, since the surface areas 32.1, 32.2 and the contact surfaces 31.1 and 31.2 are each performed parallel to each other and form a sliding pair 33.1 and 33.2. 2 illustrates a particularly advantageous embodiment of the bearing plate 22. This is shown in two views.

The left-hand illustration in FIG. 2 illustrates a view I of a bearing disk 22 according to FIG. 1. The right-hand illustration clarifies the sectional view according to FIG. 1. It can be seen from this that the bearing disk 22 does not necessarily have to be formed as an annular structure, but only a corresponding one Storage area in the form of the support surface 26 for support in the axial direction for the end face 25 must form. The rest of the configuration, in particular in the region of its outer periphery 34, can be arbitrary. However, it is desirable to choose a symmetrical design to avoid imbalances.

The bearing disk 22 has, in addition to the support region, means 28 for realizing an anti-twist device for the piston element 7. Furthermore, corresponding possibilities for connection to the connection elements, in particular for the rotationally fixed connection to the cover element 10, are provided. In the case shown, the bearing disk is for this purpose formed with two projections 36, 37 which extend in the radial direction and form fastening regions 49, through which fastening elements can be guided. In the embodiment shown in FIG. 2, passage openings 35 are provided by way of example for this purpose. The arrangement of the projections 36, 37 is symmetrical. These are designed flange and serve the rotationally fixed connection with the cover element 10. This can be brought about in various ways. Preferably, non-releasable compounds are selected. The connection is then made, for example, by riveting or by material connection. In terms of a possible interchangeability, however, a riveted connection is preferred. Also conceivable are threaded connections, but here the appropriate space must be considered and therefore riveted joints are preferred in terms of the available space. In the case shown, in addition to the center axis M coinciding in the installation position with the axis of rotation, two center axes arranged perpendicular thereto are shown, an Mx and a My axis. It can be seen that the projections 36 and 37 and the means 28 each face each other on an axis. The design of the bearing plate 22 takes place symmetrically with respect to these two axes. Other versions are also conceivable. Preferably, however, a configuration which is as uniform as possible with regard to the weight distribution and the center of gravity in the circumferential direction is selected, so that the center of gravity still lies on a center axis M which corresponds to the theoretical axis of rotation R of the power transmission device 1. Also indicated in FIG. 2 is the bearing area formed by the support surface 26 for the hub 14.

In the right-hand illustration in FIG. 2, the means 28 for preventing a rotation of the piston element 25 in the form of the two projections 30.1 and 30.2 can be seen. These are designed such that they extend away in the axial direction from the end face 24 of the bearing disc. In the case shown, the bearing plate 22 is made in one piece. The corresponding outer contour, in particular for the means for realizing the non-rotatable connection and the means 28 for realizing an anti-rotation device are preferably incorporated in one operation. The bearing disc 22 itself can be produced for example in one operation by punching and punching or drilling or in several operations by a corresponding separation process with subsequent forming process. The two projections 30.1 and 30.2 form corresponding contact surfaces 31.1 and 31.2. The contact surfaces 31.1 and 31.2 are both facing each other and each formed to the correspondingly complementary contact surfaces 32.1 and 32.2 on the piston element 7. It is crucial that the projections 30.1, 30.2 are located substantially outside the support surface 26 for the hub 14, depending on the design of the coupling between the bearing disk 22 and the piston element 7.

1 shows the configuration of a piston element 7 for realizing the positive connection with the bearing plate 22. The inner circumference diι <for the piston element 7 and the outer contour or the outer circumference 38 of the piston element 7 in FIG Area of connection or in the radially inner region and the two contact surfaces 32.1 and 32.2, which interact with the contact surfaces 31.1 and 31.2.

The solution according to the invention is mainly suitable for embodiments of power transmission devices 1 in three-channel design, in which the piston element 7 with a separate pressure, in particular control pressure, can be acted upon. In these, the piston member 7 is mostly pressure and liquid-tight both on the cover member 10 and a rotatably connected to the output A connected element in the form of the hub member 14 out. The guide is slidable in the axial direction. Preferably, however, it is desired that, to avoid relative movements, the piston element 7 rotates synchronously with the input E or the cover element 10 coupled thereto. The embodiment according to the invention with a bearing disk 22 with corresponding projections 30.1, 30.2 for realizing a positive connection offers the possibility of a particularly Fachen cost-effective implementation of a bearing assembly with additional rotation. Thus, a high functional concentration can be ensured via the individual bearing disk 22.

The three-channel design is essentially characterized by at least three connections, a first connection 39 being at least indirectly coupled to the working space 50 of the hydrodynamic component 2, the second connection 40 being connected to the interior 41, which is the rotating housing 8, in particular the impeller shell 9 and the cover element 10 coupled thereto and the outer circumference 42 of the hydrodynamic component 2 is formed. The third connection is denoted by 43 and connected to a pressurizable medium space 44, which is formed by the piston member 7 and the inner periphery 45 of the cover member 10 and the rotating housing 8. By way of the first and the second connection 39, 40, the resource management is realized essentially in the individual functional states of the hydrodynamic component. Here, a distinction is made between centrifugal and centripetal resource management. In hydrodynamic power transmission while the power transmission device 1 is flowed centripetally. This means that the operating medium is guided via the second connection 40, the intermediate space or inner space 41 along the outer circumference 42 of the hydrodynamic component 2 and is introduced into the working space 50 via the radially outer gap 46 between impeller P and turbine wheel T. There, the operating medium is circulated by the drive of the impeller P. A part passes out of the working space 50 in the radially inner region via the first connection 39. Outside the working space A, the equipment can then be guided in an external circuit. This can be provided structurally after or outside the power transmission device. In bridged operation, that is, in the case of non-successive power transmission via the hydrodynamic component, it is preferably flowed through centrifugally. This means a flow through the first port 39 in the working space A and from this via the gap 46 in the interior 41 and the second port 40 to the outside of the hydrodynamic component, preferably outside of the power transmission device 1. The connections are for this purpose with a here in coupled to each not shown here Betriebsmittelversorgungs- and leadership system. This can include open or closed circuits.

Also, the third port 43 may be fed from the same resource supply and guidance system. This can also be performed in the storage area through the hub 14, so that here always a pressure and liquid-tight chamber is realized and fer- ner this can be applied arbitrarily and selectively with a control medium with the appropriate parameters.

Figures 1 to 3 illustrate a particularly advantageous embodiment. Other possibilities, in particular the realization of the rotation, are also conceivable. Reference should preferably be made to non-positive embodiments, which, however, under certain circumstances, an increased manufacturing cost of the affected elements, in particular the bearing plate and the piston member 7, cause.

LIST OF REFERENCE NUMERALS

1 power transmission device

2 hydrodynamic component

3 hydrodynamic speed / torque converter

4 support shaft

5 coupling arrangement

6 adjusting device

7 piston element

8 rotatable housing

9 impeller shell

10 cover element

11 first coupling part

12 second coupling part

13 hollow shaft

14 hub

15 Device for damping vibrations

16 primary part

17 secondary part

18 means for spring and / or damping coupling

19 bearing arrangement

20 thrust bearings

21 plain bearings

22 bearing disc

23 sliding pair

24 front side

25 front side

26 surface area

27 means for securing against rotation of the piston element

28 funds

29 means for realizing a positive connection

30.1 lead

30.2 projection 31.1 contact surface 31.2 contact area

32.1 area

32.2 area

33.1 sliding pair

33.2 sliding pair

34 outer circumference

35 passage openings

36 advantage

37 advantage

38 outer circumference

39 connection

40 second connection

41 interior

42 outer circumference

43 third connection

44 space

45 inner circumference

46 gap

47 front side

48 contact surface

49 mounting area

50 working space

E entrance

A output

P impeller

T turbine wheel

M center axis

R rotation axis

L stator

F freewheel

Claims

claims

A power transmission device (1) for arrangement in a drive train between a prime mover and a transmission, comprising an input (E) and an output (A), a hydrodynamic component (2) disposed between input (E) and output (A) at least indirectly connectable with the output (A) turbine wheel (T) and a bearing assembly (19) for supporting the output (A) at the input (E), characterized in that the bearing assembly (19) comprises a thrust bearing (20) comprising between the input (E) and output (A) arranged in the axial direction and with the input (E) rotatably connected, a bearing disc (22) forming disc-shaped element.

2. Power transmission device (1) according to claim 1, characterized in that the input (E) of a housing part of a rotationally fixed to a pump impeller (P) of the hydrodynamic component (2) coupled to the turbine wheel (T) in the radial and axial direction to form an interior (41) enclosing the housing (8) or the housing (8) is formed and the disc-shaped element on one of the hydrodynamic component (2) pointing away in the axial direction surface area (48) on the inner circumference (45) of the housing (8 ) is arranged rotationally fixed.

3. Power transmission device (1) according to one of claims 1 or 2, characterized in that the rotationally fixed connection between the bearing disc (22) and input (E) is releasable.

4. Power transmission device (1) according to one of claims 1 to 3, characterized in that the non-rotatable connection of the input (E) with the bearing disc (22) force - or positively takes place.

5. Power transmission device (1) according to claim 4, characterized in that the connection between the bearing disc (22) and input (E) is effected by a riveted joint.

6. Power transmission device (1) according to any one of claims 1 or 2, characterized in that the rotationally fixed connection of the input (E) with the bearing disc (22) takes place cohesively.

7. Power transmission device (1) according to one of claims 1 to 6, characterized in that the bearing disc (22) on the outer circumference (34) aligned in the radial direction and mounting portions (49) forming projections (36, 37).

8. Power transmission device (1) according to one of claims 1 to 7, characterized in that the rotationally fixed connection of the bearing disc (22) with the input (E) in a region of the bearing disc (22) takes place outside of a support surface (26). for the output (A) forming area.

9. Power transmission device (1) according to one of claims 1 to 8, characterized in that the rotationally fixed connection of the turbine wheel (T) with the output (A) via a with the output (A) non-rotatably connected but in the axial direction relative to this displaceable Hub (14) takes place and the bearing disc (22) between the input (E) and the hub (14) is arranged.

10. A power transmission device (1) according to claim 9, characterized in that between the turbine wheel (T) and output (A), a device (15) for damping vibrations is arranged, comprising a with the turbine wheel (T) rotatably coupled primary part (16) and a secondary part (17) connected in a rotationally fixed manner to the output (A) and rotatable relative to one another in the circumferential direction and being connected to one another via means (18) for spring and / or damping coupling, the secondary part (17) being connected via the hub (17). 14) is connected to the output (A).

11. Power transmission device (1) according to one of claims 1 to 10, characterized in that it comprises a switchable coupling device (5) with a pressurizable piston element (7) having actuating device (6), the piston element (7) at the output ( A) pressure and liquid-tight and displaceable in the axial direction and is guided free of a rotationally fixed connection with this and between the piston element (7) and input (E) an anti-rotation (27) is provided.

12. Power transmission device (1) according to claim 11, characterized in that the rotation (27) at least one non-rotatable, but in the axial direction of a Relative movement permitting connection between the bearing disc (22) and the piston element (7).

13. Power transmission device (1) according to claim 12, characterized in that the rotationally fixed connection is designed as a positive or non-positive connection.

14. Power transmission device (1) according to claim 13, characterized in that the anti-rotation device (27) comprises at least one bearing disc (22) aligned in the axial direction and a Verdrehsicherungsbereich forming projection (30.1, 30.2), which in complementarily executed recesses on Piston element (7) engages.

15, power transmission device (1) according to claim 13, characterized in that the rotation (27) at least one on the bearing disc (22) aligned in the axial direction and a Verdrehsicherungsbereich forming projection (30.1, 30.2), which in the circumferential direction considered a flat Having contact surface (31.1, 31.2) forming portion which can be brought into operative connection with a forming on an outer circumference portion of the piston member (7) complementary planar surface area (32.1, 32.2).

16. Power transmission device (1) according to any one of claims 14 or 15, characterized in that the Verdrehsicherungsbereiche forming projections (30.1, 30.2) with the mounting portions (49) forming projections (36, 37) alternately in the circumferential direction of the bearing disc (22) are arranged.

17. Power transmission device (1) according to claim 16, characterized in that the bearing disc (22) is designed symmetrically.

18. Power transmission device (1) according to one of claims 1 to 17, characterized in that the bearing disc (22) on the output (A) cooperating support surface (26) has a wear-resistant surface.

19. Power transmission device (1) according to claim 18, characterized in that the surface is produced by a coating or surface treatment or surface treatment.

20. Power transmission device (1) according to one of claims 1 to 19, characterized in that the bearing disc (22) is designed wear-resistant.

21. Power transmission device (1) according to one of claims 1 to 20, characterized in that the bearing disc (22) is hardened.

22. Power transmission device (1) according to one of claims 1 to 21, characterized in that it is designed as a three-channel unit comprising a first connection (39) for connection to the working space (50) of the hydrodynamic component, a second connection (40) Connection with the housing (41) enclosed by the housing (41) and a third connection (43) for connection to an intermediate space (44) formed between the piston element (7) and the housing (8).

23 bearing disc (22), in particular axial plain bearing disc for use in power transmission devices (1) between rotating at relative speed connection elements, characterized in that this as a disc-shaped element with a contact surface (48) for abutment against a connecting element on a first axial end face (47) , a sliding bearing surface area as a support surface (26) on the other end face (24) is executed, comprising mounting portions (49) for non-rotatable connection with the connection element and means (28) for preventing rotation.

24. bearing disc (22) according to claim 23, characterized in that the means (28) for preventing rotation in the axial direction and aligned by the support surface (26), in particular sliding bearing surface forming end face (24) extending projections (30.1, 30.2) ,

25 bearing disc according to claim 24, characterized in that the single projection (30.1, 30.2) viewed in the circumferential direction describes a plane a contact surface (31.2, 31.2) forming surface area.