CN105864310B

CN105864310B - Modular pressure plate with cam structure for friction clutch

Info

Publication number: CN105864310B
Application number: CN201510037113.3A
Authority: CN
Inventors: 克里斯蒂安·阿萨尔
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2015-01-23
Filing date: 2015-01-23
Publication date: 2020-07-28
Anticipated expiration: 2035-01-23
Also published as: CN105864310A; DE102015225616A1

Abstract

The invention relates to a pressure plate for a friction clutch, comprising a base plate having a flat pressing side and a flat rear side opposite the pressing side, and an annular cam arrangement having a contact surface for an actuating device of the friction clutch; the one cam structure is arranged on the rear side of the base plate and forms the entire contact surface for the friction clutch actuating device, the base plate and the annular cam structure being able to be produced as a single part and being connected to one another for forming the pressure plate.

Description

Modular pressure plate with cam structure for friction clutch

Technical Field

The invention relates to a pressure plate for a friction clutch of a motor vehicle.

Background

Friction clutches are used for the releasable, frictional transmission of torque from a drive unit to a driven system, for example in a motor vehicle, for transmitting torque from the drive unit, for example an internal combustion engine, to a drive train. The friction clutches are to be designed individually, in particular with regard to the required size of the friction surfaces, depending on the torque to be transmitted and the installation space. Due to the basically rotationally symmetrical design about the axis of rotation, this results in particular in the diameter of the friction clutch having to be changed and thus in the pressure plate and the contact surface for the friction clutch actuating device also having to be changed. Press plates made by casting methods and by forming methods are known. High mold costs are to be considered in the production by casting methods. In the production of press plates by molding methods, it is difficult to set precise positions and heights for the projections provided as contact surfaces of the actuating device. For both methods, it is suitable to produce only pressure plates with a relatively large radius in the transition between the friction surface and the side surface. Furthermore, a separate mold set is required for a platen of a predetermined size. With these die sets, it is not possible to manufacture press plates having other dimensions which differ only to a small extent. Therefore, high mold costs are incurred for the press plates to be manufactured in small batches, respectively.

Furthermore, a friction clutch and a pressure plate are known from WO 2012/019585 a2, wherein the pressure plate consists of a flat steel ring and an annular cam ring. The cam ring has driving cams which engage in complementarily formed bores of the flat steel ring, whereby the cam ring is received on the steel ring in a rotationally fixed and axially floating manner. Thus, WO 2012/019585 a2 is incorporated in its entirety by reference into the general applicable and well known friction clutch construction described therein.

Disclosure of Invention

Starting from this, the object of the invention is to overcome at least partially the disadvantages known from the prior art. In particular, it is desirable to be able to produce the pressure plate in a cost-effective manner. The pressure plate should furthermore have as little weight as possible.

The invention relates to a pressure plate for a friction clutch, comprising a base plate having a flat pressing side and a flat rear side opposite the pressing side, and an annular cam arrangement having a contact surface for a friction clutch actuating device; the one cam structure is arranged on the rear side of the base plate and forms the entire contact surface for the friction clutch actuating device, wherein the base plate and the annular cam structure can be produced in a single piece and are connected to one another for forming the pressure plate. The annular projection arrangement is here a ring which is open in the circumferential direction.

That is to say that the lug structure has in particular two ends. Whereby the annular projection arrangement can be broken open or closed (i.e. the two ends are moved away from or towards each other). The diameter of the annular projection arrangement can thus be adapted as required to a diameter predetermined in the design of the arrangement. In this way, a lug structure which is otherwise identical can be used for friction clutches of different sizes.

It is in contrast to WO 2012/019585 a2 described at the outset that the open-construction lug structures proposed here enable identical lug structures to be combined with bottom plates of different sizes.

In particular, the base plate is thus a disk with mutually parallel end faces (pressing side and rear side) which are oriented transversely to the central axis of rotation of the pressure plate. The pressing side and the back side are connected to each other by an outer circumferential surface and an inner circumferential surface. These end faces are in particular flat, that is to say in particular have no elevations. But may in particular be provided with channels or recesses.

In particular, such flat base plates do not have large casting or forming radii, which reduce the friction surfaces on the press side of the base plate, which friction surfaces are predetermined for the design. Such a large casting radius or forming radius occurs on the pressure plate which is integrally produced by the casting method or the forming method as described above. In contrast, the flat base plate proposed here can be designed with a small radius or even sharp edges on the outer circumferential surface and on the inner circumferential surface in the transition between the pressing side and the circumferential surface and in the transition between the back side and the circumferential surface, so that the friction surface extends in particular up to the maximum diameter of the outer circumferential surface or up to the minimum diameter of the inner circumferential surface (wherein, of course, outwardly or inwardly directed attachment surfaces for the leaf springs are not considered here).

The projection arrangement extends concentrically with the axis of rotation in the circumferential direction.

The base plate has in particular an attachment surface directed outward in the radial direction from the outer circumferential surface, which attachment surface is used for the attachment of the leaf spring. The leaf springs are connected at one end to the base plate and at their other end to the cover of the friction clutch. By these leaf springs, the base plate is connected with the cover.

In particular, the base plate and the bump structure are connected to each other by a welding method.

Alternatively (or additionally if necessary), the base plate and the projection arrangement are connected to one another by a plurality of connecting elements.

Rivets are used in particular as connecting elements. But screws can also be used as connecting elements.

Preferably, the base plate has a plurality of channels extending from the squeeze side to the back side. The projection arrangement has in particular at least one flange with at least one hole. The channels and the holes are arranged in alignment with each other and each connecting element extends through one channel and one hole aligned therewith. In particular, recesses are provided on the pressing side and/or on the rear side, in which screw heads or rivet heads of the connecting element are received, whereby at least one of the pressing side and the rear side has a flat surface (without elevations).

The invention also proposes a method for producing a press plate according to the invention, comprising at least the following steps:

i. preparing a bottom plate;

preparing a ring-shaped bump structure;

connecting the base plate with the bump structure to form a platen.

In particular, the annular projection arrangement is a ring which is open in the circumferential direction and has two ends which are spaced apart from one another, wherein the diameter of the open ring is adjusted to the contact surface diameter required for the pressure plate before step iii.

Furthermore, a friction clutch is proposed for the releasable frictional transmission of a torque from an input shaft to an output shaft, which friction clutch comprises a pressure plate described here.

Other elements are, for example, friction disks, counterplates, disk springs, actuating devices and the like, which are used to actuate the friction clutch, i.e. to engage or disengage, and to transmit torque from the input shaft to the output shaft.

According to a further aspect, a motor vehicle is proposed, which has a drive unit with a driven shaft, having a drive train and a friction clutch as described in this document for releasably connecting the driven shaft to the drive train. The drive unit is preferably arranged in the motor vehicle in front of the cab and transversely to the longitudinal axis of the motor vehicle.

The features listed individually in the claims can be combined with one another in any desired, technically meaningful manner and can be supplemented by explanatory contents in the description and by details of the drawing, in which an embodiment of the invention is shown. The embodiments for the platen apply equally to the method and vice versa.

Drawings

The invention and the technical field are explained in detail below with the aid of the figures. The figures show particularly preferred embodiments, to which however the invention is not limited. It is to be noted in particular that the drawings, in particular the dimensional proportions shown, are purely schematic. Like reference numerals refer to like objects. The figures show:

FIG. 1 is a side cross-sectional view of the friction clutch;

FIG. 2 is a perspective view of a platen known from the prior art;

FIG. 3 is a side sectional view of the platen and base plate of FIG. 2 in a common view;

FIG. 4 is a perspective view of a first embodiment of the base plate with the back side visible;

FIG. 5 is the bottom plate of FIG. 4, with the crush side visible;

fig. 6 is a perspective view of a first embodiment of a bump structure;

FIG. 7 is a perspective view of a first embodiment of a platen;

FIG. 8 is a perspective view of a second embodiment of the base plate with the back side visible;

FIG. 9 is the bottom plate of FIG. 8 with the crush side visible;

fig. 10 is a perspective view of a second embodiment of a bump structure;

FIG. 11 is a perspective view of a second embodiment of a platen;

FIG. 12 is a perspective view of a third embodiment of a platen; and

FIG. 13 is a perspective view of a fourth embodiment of a platen.

Detailed Description

Fig. 1 shows a side sectional view of a friction clutch 2. The friction clutch comprises a pressure plate 1 and a cover 20. The pressure plate comprises a base plate 3 with a flat pressing side 4 and a flat rear side 5 opposite the pressing side 4, and an annular cam structure 6 with an abutment surface 7 for an actuating device 8 (disk spring 19) of the friction clutch 2. The cam structure 6 is arranged on the rear side 5 of the base plate 3 and forms the entire contact surface for the actuating device 8 of the friction clutch 2, wherein the base plate 3 and the annular cam structure 6 can be produced as a single part and are connected to one another to form the pressure plate 1. It can be seen that the annular cam structure 6 is a ring 14 which is open in the circumferential direction 13.

Fig. 2 shows a perspective view of a press plate 1 known from the prior art, produced by casting or forming technology. The pressure plate 1 is formed in one piece and has a pressing side 4 and an opposite rear side 5. On the rear side 5, projection structures 6 are provided, each of which has an abutment surface 7. The pressure plate 1 is of annular design and has a rotational axis 26. The pressure plate 1 has outwardly directed attachment faces 25 for the attachment of the leaf springs. The leaf springs are connected at one end to the pressure plate and at the other end to the cover of the friction clutch.

Fig. 3 shows the press plate 1 from fig. 2 and the base plate 3 in a common view in a side sectional view. The pressure plate 1 is formed in one piece and has a shaped projection structure 6, which extends in the axial direction 17 from the rear side 5. On the upper end of the cam arrangement, an attachment surface 7 is provided, which serves as a pivot bearing for a disk spring arranged in the friction clutch. The disk spring and the pivot bearing are components of an actuating device 8 of the friction clutch 2. The pressure plate 1 extends annularly about the axis of rotation 26. It can be seen that, in this pressure plate 1, the radius 23 in the transition between the pressure side 3 and the outer circumferential surface 21 or in the transition between the pressure side 3 and the inner circumferential surface 22 is formed very large. Accordingly, the friction surface 27 does not extend to the maximum diameter 16 of the outer circumferential surface 21 or to the minimum diameter 16 of the inner circumferential surface 22 (see fig. 4).

In contrast, the corresponding radius 23 of the base plate 3 is of a smaller design, so that a significantly larger portion of the press side 4 can be used as the friction surface 27. The friction surface 27 extends, in particular with a pronounced extent, further outward in the radial direction 18 than in the case of a press plate 1 produced by casting or molding techniques.

Fig. 4 shows a perspective view of a first embodiment of the base plate 3, wherein the rear side 5 can be seen. The base plate 3 is of annular design and extends around the axis of rotation 26. The base plate 3 has a flat pressing side 4 and a flat rear side 5 opposite the pressing side. The base plate 3 also has attachment faces 25 directed outwards in the radial direction 18 from the outer circumferential face 21, which provide for the attachment of the leaf springs. The base plate has a maximum diameter 16 of the outer circumferential surface 21 and a minimum diameter 16 of the inner circumferential surface. The attachment face 25 is not considered here.

Fig. 5 shows the base plate of fig. 4, wherein the press side 4 can be seen.

Fig. 6 shows a perspective view of a first embodiment of a bump structure 6. The annular cam structure 6 is a ring 14 which is open in the circumferential direction 13 and has two ends 15. Thus, the annular bump structures 6 can be broken or folded (i.e., the two ends 15 move away from or approach each other). The diameter of the annular cam structure 6 can thus be adapted as required to the diameter 16 predefined in terms of design. In this way, the cam arrangements 6, which are otherwise identical in construction, can be used for friction clutches 2 of different sizes.

Fig. 7 shows a perspective view of a first embodiment of the pressure plate 1. The pressure plate 1 comprises a base plate 3 having a flat pressing side 4 and a flat rear side 5 opposite the pressing side 4, and further having an annular cam arrangement 6 having an abutment surface 7 for an actuating device 8 of the friction clutch 2, wherein one cam arrangement 6 is arranged on the rear side 5 of the base plate 3 and forms the entire abutment surface 7 for the actuating device 8 of the friction clutch 2. The base plate 3 and the annular projection arrangement 6 can be produced as parts and connected to one another in order to form the pressure plate 1. The annular cam structure 6 is a ring 14 which is open in the circumferential direction 13 and whose ends 15 are spaced apart from one another in the circumferential direction, in particular at exactly one position of the ring 14.

Fig. 8 shows a perspective view of a second embodiment of the base plate 3, in which the rear side 5 can be seen. See the explanation for fig. 4 herein. In fig. 8, the base plate 3 additionally has a channel 10.

Fig. 9 shows the base plate of fig. 8, wherein the press side 4 can be seen. See the explanation for fig. 5 herein. Concentrically with the channel 10 recesses 24 are provided, which are adapted to receive the connecting elements 9. This ensures a flat friction surface 27 (without elevations) on the pressure side.

Fig. 10 shows a perspective view of a second embodiment of the bump structure 6. See the explanation for fig. 6 herein. The cam structure 6 here additionally comprises a collar 11 in which a hole 12 for the connecting element 9 is provided. It can be seen that the flange 11 extends here continuously in the circumferential direction 13 along the cam structure 6.

Fig. 11 shows a perspective view of a second embodiment of the pressure plate 1, with reference to the explanation of fig. 7. The press plate 1 is formed from a base plate 3 according to fig. 8 and 9 and from a projection arrangement 6 according to fig. 10. The holes 12 and the channels 10 are arranged in alignment with each other so that the base plate 3 and the bump structures 6 can be connected to each other by the connecting elements 9.

Fig. 12 shows a perspective view of a third embodiment of the pressure plate 1. Reference is made here to the explanations of fig. 11 and 7. It can be seen that the cam structure 6 has a plurality of flanges 11, each of which is formed with a bore 12.

Fig. 13 shows a perspective view of a fourth embodiment of the pressure plate 1. Reference is made here to the explanations of fig. 11 and 7. It can be seen that the cam structure 6 has a plurality of flanges 11, which are only partially formed with holes 12. The other flange 11 is connected to the base plate 3 by a welded connection 28 or merely forms a support (i.e. is connected to the base plate 3 neither by a welded connection 28 nor by a connecting element 9).

List of reference numerals

1. Pressing plate

2. Friction clutch

3. Base plate

4. Extruding side

5. Back side

6. Bump structure

7. Contact surface

8. Operating device

9. Connecting element

10. Channel

11. Flange

12. Hole(s)

13. In the circumferential direction

14. Ring (C)

15. End part

16. Diameter of

17. Axial direction

18. Radial direction

19. Disc spring

20. Cover

21. Peripheral surface

22. Inner peripheral surface

23. Radius of

24. Depressions

25. Attachment surface

26. Axis of rotation

27. Friction surface

28. Welded connection

Claims

1. Pressure plate (1) for a friction clutch (2), comprising:

i. a base plate (3) having a flat pressing side (3) and a flat rear side (5) opposite the pressing side (4), and

an annular cam arrangement (6) having an abutment surface (7) for an actuating device (8) of the friction clutch (2);

wherein the one cam structure (6) is arranged on the rear side (5) of the base plate (3) and forms the entire contact surface (7) for an actuating device (8) of the friction clutch (2), wherein the base plate (3) and the annular cam structure (6) can be produced as a single part and are connected to one another for forming the pressure plate (1), characterized in that the annular cam structure (6) is a ring (14) which is open in the circumferential direction (13).

2. The press plate (1) according to claim 1, wherein the base plate (3) and the bump structure (6) are interconnected by means of a welding method.

3. The press plate (1) according to claim 1, wherein the base plate (3) and the bump structure (6) are interconnected by a plurality of connecting elements (9).

4. The press plate (1) according to claim 3, wherein rivets are used as the connecting elements (9).

5. The press plate (1) according to claim 3 or 4, wherein the base plate (3) has a plurality of channels (10) which extend from the press side (4) to the back side (5), and wherein the cam structure (6) has at least one flange (11) with at least one hole (12), wherein the channels (10) and the holes (12) are arranged in alignment with one another and through which the connecting element (9) extends.

6. Method for manufacturing a press plate (1) according to any one of the preceding claims, comprising at least the following steps:

i. preparing a base plate (3);

preparing a ring-shaped bump structure (6);

connecting the base plate (3) and the bump structure (6) to form a press plate (1);

wherein the annular cam structure (6) is a ring (14) which is open in the circumferential direction (13) and has two ends (15) which are spaced apart from one another, and wherein, before step iii, the diameter (16) of the open ring (14) is adjusted to the diameter (16) of the contact surface (7) required by the pressure plate (1).