DE102018113337A1 - Pressure plate unit for a friction clutch of a motor vehicle drive train and clutch device - Google Patents

Abstract

The invention relates to a pressure plate unit and a coupling device. The pressure plate unit (1) comprises a pressure plate (2), which is essentially annularly formed from a plurality of pressure plate segments (10) arranged successively in the circumferential direction (30), at least one first and one second pressure plate segment (11, 12) facing end faces (16 ) and extending from one end face (16) of the first pressure plate segment (11) substantially in the circumferential direction (30) a projection (20) and the adjacent second pressure plate segment (12) has a shape and size of the projection (20) complementarily configured recess (21), in which the projection (20) is arranged, and wherein the pressure plate unit (1) further on the friction side (4) of the pressure plate (2) facing away from side (5) has a ring element (3) and the ring element (3) in the circumferential direction (30) at least the first pressure plate segment (11) and the second pressure plate segment (12) integrally connects to each other, where at least one cohesive connection (15) between the first Anpressplattensegment (11) and the ring member (3) on or on the projection (20) is executed.With the pressure plate according to the invention is reliably a radial stability of the pressure plate with low installation costs and long life of Pressure plate unit combined.

Description

The invention relates to a pressure plate unit for a friction clutch of a motor vehicle drive train, comprising a pressure plate and a ring member, and a coupling device for a motor vehicle for coupling an internal combustion engine and a transmission.

Pressure plates are known from the prior art, which are divided into a plurality of Anpressplattensegmenten.

The WO 2017/045 678 A1 describes several in the circumferential direction of the pressure plate successively arranged and with respect to each other at least partially displaceable Anpressplattensegmente, wherein the circumferential direction is in a normal plane relative to the axial direction. A pressure plate segment is in each case connected by means of a connecting device with an adjacent pressure plate segment, wherein the connecting device substantially has a contour which is receivable in a recess formed by the adjacent pressure plate segment.

Furthermore, coupling devices, in particular friction clutches are known, comprising the contact elements to which a plate spring can be applied at least indirectly, wherein the contact elements are non-positively or positively connected to the pressure plate.

The DE 10 2014 218 534 A1 describes to a pressure plate for a friction clutch, also a cast-iron Anpresskörper a pressure plate, and a connected to the Anpresskörper cam body. The contact body comprises a friction surface for engagement with a clutch disc. The cam body comprises Anpressnocken for abutment on a, in particular designed as a plate spring, actuating element for displacing the pressure plate. The cam body is in the circumferential direction relative to the Anpresskörper after overcoming a, in particular frictionally applied, holding force rotatably connected to the pressing body via retaining and retaining lugs or connected captively.

The DE 10 031 598 A1 discloses a pressure plate for a friction clutch, wherein the pressure plate is divided into a plurality of circumferentially successive and with respect to each other at least partially displaceable Anpressplattensegmenten, which are held together by a cohesion arrangement. The cohesion arrangement is arranged on the side facing away from a friction surface of the pressure plate on the pressure plate, in particular riveted to this, wherein the cohesion arrangement is designed such that individual Anpressplattensegmente are elastically interconnected or become.

The WO 2015/127 929 A1 describes a coupling device for a drive train of a motor vehicle. The coupling device comprises inter alia a pressure plate which has at least one annular, formed sheet metal plate with a substantially L-shaped or U-shaped cross-section. On the metal plate or on legs of the metal plate, a plate spring can be applied, wherein the metal plate is connected by means of a rivet connections with an additional plate covered by the pressure plate, which forms the friction surface.

Furthermore, coupling devices, in particular friction clutches are known which comprise at least one contact element, to which a plate spring can be applied at least indirectly, wherein the contact element is integrally connected to the pressure plate.

The WO 2014/032 919 A1 describes a pressure plate for a friction clutch, wherein the pressure plate comprises a holding element and a plurality of Reibplattensegmenten. The holding element has a contact side and a contact side opposite the opposite side, wherein the Reibplattensegmente are connected to the contact side of the support member materially connected thereto.

In addition, the describes DE 10 2015 226 320 A1 a pressure plate assembly for a wear-adjusting friction clutch of a motor vehicle drive train. In this case, the Anpressplattenzusammenbau comprises a one-piece or multi-part formed plate member. On the plate component, a ramp ring consisting of a sheet metal plate is non-rotatably mounted on an axial end face, wherein the ramp ring has a plurality of circumferentially increasing single ramp areas. The ramp ring is rotatably mounted or secured in one or more joining areas with cohesive connection on Plattenbau.

In the teachings of the documents WO 2014/032 919 A1 and DE 10 2015 226 320 A1 the respective cohesive connections are designed essentially for the purpose of realizing a rotationally fixed attachment.

It is furthermore known that segmented pressure plates, which form a puzzle-like configuration, comprising a contour and a counter-contour receiving this, form the connection of the individual plate segments, especially in radially outer regions of the mating contour and at high Speed and thus large forces acting on the components centrifugal forces allow an impermissible deformation of the entire pressure plate unit.

Proceeding from this, the object of the present invention is to provide a pressure plate unit which combines a cost-effective design with a long service life.

The object is achieved by the pressure plate unit according to the invention according to claim 1. Advantageous embodiments of the pressure plate unit are specified in the subclaims 2 to 9. In addition, a coupling device for a motor vehicle for coupling an internal combustion engine and a transmission according to claim 10 is provided.

The features of the claims may be combined in any technically meaningful manner, for which purpose the explanations of the following description as well as features of the figures may be consulted which comprise additional embodiments of the invention.

The terms "radial", "axial" and "circumferential direction" in the context of the present invention always refer to the axis of rotation of the pressure plate unit or a friction clutch equipped therewith.

The invention relates to a pressure plate unit for a friction clutch of a motor vehicle drive train. The pressure plate unit comprises a pressure plate with a friction side for frictional pressing against a clutch disc or to a clutch plate for the purpose of transmitting torque, and a ring member on the side facing away from the friction side of the pressure plate for at least indirectly supporting at least one component of a plate spring a friction clutch.

The pressure plate is substantially annularly formed from a plurality of circumferentially successively arranged Anpressplattensegmenten, wherein at least a first and a second pressure plate segment, which are arranged adjacent to each other in the circumferential direction, facing each other end faces. From a front side of the first Anpressplattensegments extends substantially in the circumferential direction, a projection, wherein the adjacent second Anpressplattensegment has a shape and size of the projection complementarily configured recess in which the projection is arranged. It is inventively provided that the ring member in the circumferential direction, at least the first Anpressplattensegment and the second Anpressplattensegment integrally connects to each other, wherein at least one cohesive connection between the first Anpressplattensegment and the ring member is executed on or on the projection.

The circumferential direction extends in a plane which is substantially perpendicular to the axis of rotation of the pressure plate unit or a friction clutch equipped therewith.

Due to the projection and the complementary recess, the first pressure plate segment and the second pressure plate segment, preferably in such a way all pressure plate segments of the pressure plate, are interconnected in one plane.

The Anpressplattensegmente can be the same and / or different structure, but must be able to form the pressure plate in their entirety.

However, the invention is not limited to the fact that the cohesive connections are realized only in the region of projection and recess, but in addition to the cohesive connections in these connection areas further connections, in particular cohesive connections, be realized with the Anpressplattensegmenten outside of projection and recess ,

According to one embodiment of the invention, a gap is formed between the projection and the recess forming material. The cohesive connection is limited to or on the first pressure plate segment and the second pressure plate segment along the circumferential direction through the gap.

This means that the cohesive connection, preferably designed as a welded connection, is brought up on both sides of the gap up to this. As a result, the stability in the region of the projection and the recess in their mutual engagement is substantially increased, in particular under the action of centrifugal forces on the realized by projection and recess positive connection.

According to a simple and stable embodiment, the cohesive connection is designed as a welded connection, in particular as a fillet weld.

In addition, the object according to the invention is preferably realized in such a way that at least one of the two pressure plate segments extends on the front side additional material that realizes the cohesive connection is arranged between the respective pressure plate segment and the ring member.

This means that in the preferred embodiment of the cohesive connection as a weld with the use of additional material a welded connection is realized at least partially within a gap between two adjacent Anpressplattensegmenten. Thus, the width of the gap is reduced in the connecting region between the Anpressplattensegmenten and thus delivered a contribution to the radial stability of the pressure plate.

Furthermore, an embodiment according to the invention provides that the cohesive connection between ring element and projection is executed at least in regions on at least one radial boundary edge of the substantially circumferentially extending projection.

In particular, it may be provided that in the axial direction the ring element substantially overlaps the projection such that the radial inner side of the ring element terminates with the inner radial boundary edge of the projection, and / or terminates the radial outer side of the ring element with the outer radial boundary edge of the projection, wherein a cohesive connection, in particular designed as a welded connection, between the radial inner side of the ring member and the inner radial boundary edge of the projection is realized, or a material connection, in particular designed as a welded connection, between the radially outer side of the ring member and the outer radial boundary edge of the projection is realized.

In a further embodiment, the projection on the first pressure plate segment comprises a radially extending extension, wherein in the second pressure plate segment, a correspondingly complementarily formed, radially extending recess part is formed.

This embodiment further increases the stability of the pressure plate in the radial direction under the action of centrifugal forces, by the positive engagement of the thus angled designed projection in a correspondingly shaped recess.

According to a further embodiment, the cohesive connection is formed on or on the radially extending extension of the projection.

This means that in the preferred embodiment of the cohesive connection as a weld, this extends over the radially extending extension and is preferably realized on the other side of the gap on or on which the radially extending recess part forming material.

According to a preferred embodiment, the ring element has a plurality of axially extending cams, wherein the cams are connected by means of material-locking connections with the Anpressplattensegmenten.

According to a preferred embodiment, the ring element has, as an alternative to the aforementioned embodiment, a plurality of ramp elements by which it is suitable for acting as a counter-ramp ring of a wear-adjusting friction clutch.

In a further alternative embodiment, it is provided that the ring element is made essentially flat on the side opposite the pressure plate segments, so that a plate spring can come to rest there in one plane.

Furthermore, according to the invention, a coupling device, in particular a friction clutch, is provided for a motor vehicle for coupling an internal combustion engine and a transmission, which has a pressure plate unit according to the invention and a clutch disc, wherein the clutch disc can be acted upon by the pressure plate unit with an axial contact force to generate a frictional force on the clutch disc for the purpose of frictional transmission of torque.

In this case, the coupling device can be designed as a self-adjusting coupling device, wherein the ring element may have ramps on which the ramps of a Gegenrampenrings can slide so that, depending on the relative angular position of the two rings to each other, these may have different axial distances to each other. Accordingly, the distance between the pressure plate unit and other elements of the coupling device, in particular an axial force applying disc spring, which is at least indirectly supported by the ring element, set.

• 1: die Anpressplatteneinheit in Draufsicht.
• 2: ein Ausschnitt der Anpressplatte,
• 3: eine Schnittansicht zum Schnitt A-A aus der 2,
• 4: ein Ausschnitt der Anpressplatte mit Ringelement,
• 5: eine Schnittansicht zum Schnitt A-A aus der 4,
• 6: ein Ausschnitt der Anpressplatte mit Ringelement und stoffschlüssiger Verbindung, und
• 7: eine Schnittansicht zum Schnitt A-A aus der 6.

The above-described invention will be explained in detail in the background of the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is not limited by the purely schematic drawings in any way, it being noted that the embodiments shown in the drawings are not limited to the dimensions shown. It is shown in

• 1 : the pressure plate unit in plan view.
• 2 a section of the pressure plate,
• 3 : a sectional view to the section AA from the 2 .
• 4 : a section of the pressure plate with ring element,
• 5 : a sectional view to the section AA from the 4 .
• 6 a section of the pressure plate with ring element and cohesive connection, and
• 7 : a sectional view to the section AA from the 6 ,

In 1 is an embodiment of the pressure plate unit 1 shown in plan view. The pressure plate unit 1 includes a pressure plate 2 and in the axial direction next to a ring element 3 , The pressure plate 2 as well as the ring element 3 are substantially annular, wherein the pressure plate 2 in the embodiment illustrated here, six along a circumferential direction 30 the pressure plate 2 arranged pressure plate segments 10 includes. A respective pressure plate segment 10 points to one of its faces 16 a lead 20 and at the opposite end in the circumferential direction 16 a recess 21 on. The lead 20 and the recess 21 are in the embodiment shown here substantially centrally on a respective end face 16 arranged. A respective lead 20 is in a recess 21 , forming a gap 22 , placed. This has a projection 20 a contour and a recess 21 In the embodiment shown here, a respective contour or mating contour extends substantially T-shaped, so it has one in the circumferential direction 30 extending portion, which by a radially inner and outer boundary edge 23 . 24 is limited, and at the end of this section a radially extending extension 25 or radially extending recess parts 26 each radially inward and radially outward. A respective lead 20 a pressure plate segment 10 engages in a recess 21 a neighboring pressure plate segment 10 on. Several interlocking pressure plate segments 10 thus form the pressure plate in a closed ring arrangement 2 ,

The ring element 3 is by means of several cohesive connections 15 on the friction side of the pressure plate 2 opposite side 5 arranged. At least some of these cohesive connections 15 thereby run on a pressure plate segment 10 up to its circumferential boundary to the gap 22 and be beyond the gap 22 immediately thereafter at the opposite circumferential boundary of the adjacent pressure plate segment 10 continued. Here is the ring element 3 arranged such that it is substantially centered over a respective projection 20 runs.

2 to 7 show an alternative embodiment to that in 1 illustrated pressure plate unit 1 , in contrast to the in 1 illustrated embodiment of the projection 20 only a radially inward extension 25 having. Correspondingly, the respective adjacent adjacent in the circumferential direction pressure plate segment 10 only with a complementary designed, radially inwardly extending recess part 26 educated.

2 shows a section of a pressure plate 2 , wherein a first pressure plate segment 11 comprising a projection 20 and a second pressure plate segment 12 comprising a recess 21 is shown. You can see the pressure plate segment e 102 doing so in the axial direction, in which case the friction side of the pressure plate 2 opposite side 5 is apparent. The two pressure plate segments 11 . 12 each have an end face 16 on, with which they to the other pressure plate segment 12 . 11 in the circumferential direction 30 are arranged adjacent. Equivalent to the projections 20 out 1 , extends into 2 the lead 20 first from the front 16 in the circumferential direction 30 and has a radially inner boundary edge 23 and a radially outer boundary edge 24 on. At the end of this section has the lead 20 a radially extending extension 25 on, which runs radially inward here, whereby the projection 20 essentially forms an L-shaped contour. As a counterpart to the projection 20 forms the second pressure plate segment 12 the recess 21 also initially in the circumferential direction 30 extending and then with a radially extending recess part 26 extending radially inwards. Such is the advantage 20 inside the recess 21 , under formation of a gap 22 , to be placed. In addition, this configuration already provides a positive connection of the pressure plate segments 10 reached.

Furthermore, in 2 the course of a cut AA marked. The sectional view of this section AA in 2 is in 3 shown.

3 shows the in 2 illustrated state along the cut AA , It can be seen here that the two pressure plate segments 10 a rubbing side 4 and one of the friction side 4 opposite side 5 the pressure plate 2 form. The cut AA runs in 2 in the portion of the extension of the projection 20 as well as the recess 21 in the circumferential direction 30 , It is thus by the radial inside as well as through the outer boundary edge 23 . 24 cut. 3 shows accordingly the positioning of the projection 20 in the radial direction between material of the second pressure plate segment 12 , It is also apparent here that a gap 22 between the projection 20 and the material of the second pressure plate segment 12 also exists in the radial direction.

4 shows a section of a pressure plate 2 as he is in 2 is shown, in 4 also a section of the ring element 3 is shown. The ring element 3 lies on the friction side 4 opposite side 5 the pressure plate 2 on which is in the circumferential direction 30 extending portion of the projection 20 , The radially inner boundary edge 23 of the projection 20 in its circumferentially extending portion is here congruent with the radial inner side of the ring member 3 , wherein also the radially outer boundary edge 24 of the projection 20 congruent with the radial outer side of the ring member 3 is.

Furthermore, in 4 the course of a cut AA marked. The sectional view of this section AA in 4 is in 5 shown.

5 shows the sectional view along the section AA in 4 , In addition to 3 shows 5 a cut portion of the arranged ring element 3 , The ring element 3 is like in 4 shown on the rubbing side 4 opposite side 5 the pressure plate 2 or their pressure plate segments 10 on. The radially inner boundary edge 23 of the projection 20 and the radial inside of the ring member 3 and the radially outer boundary edge 24 and the radial outside of the ring element 3 are here congruently positioned.

6 shows a section of a pressure plate 2 as he is in 4 is shown, in which case the ring element 3 by means of cohesive connections 15 firmly with the pressure plate segments 10 connected is. Accordingly, shows 6 a section of a pressure plate according to the invention 1 , Essentially two cohesive connections can be seen 15 , respectively on the radial inside and outside of the ring member 3 , A respective cohesive connection 15 covers at least partially the gap 22 , this through the use of additional material 18 in which the cohesive connection producing process, which is preferably a weld realized.

Furthermore, in 6 the course of a cut AA marked. The sectional view of this section AA in 6 is in 7 shown.

7 provides 5 extended by cohesive connections 15 Shown are two cohesive connections 15 , respectively on the radial inside and outside of the ring element 3 , A respective cohesive connection 15 connects the ring element 3 with the lead 20 as well as with the recess 21 realizing material. Consequently, in an angular position, the ring element 3 simultaneously with the first pressure plate segment 11 and the second pressure plate segment 12 connected. The cohesive connection 15 is doing so using additional material 18 on the rubbing side 4 the pressure plate 2 opposite side 5 essentially with this site 5 radially limiting, the gap 22 facing edge with a respective pressure plate segment 12 connected. The cohesive connection 15 forms as a welded joint executed at least between the second pressure plate segment 12 and the ring element 3 a fillet weld 17 out.

Consequently, with the welding shown here, not only is the connection of the pressure plate segments 10 in the circumferential direction via the ring element 3 realized, but also at the angular position of the respective weld in the radial direction.

With the pressure plate unit according to the invention, a radial stability of the pressure plate is reliably combined with low assembly costs and a long service life of the pressure plate unit.

LIST OF REFERENCE NUMBERS

1

Anpressplatteneinheit

2

pressure plate

3

ring element

4

friction side

5

the friction side of the pressure plate side facing away

10

Anpressplattensegment

11

first pressure plate segment

12

second pressure plate segment

15

cohesive connection

16

front

17

fillet

18

additional material

20

head Start

21

recess

22

gap

23

radially inner boundary edge

24

radially outer boundary edge

25

radially extending extension

26

radially extending recess part

30

circumferentially

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2017/045678 A1 [0003]
• DE 102014218534 A1 [0005]
• DE 10031598 A1 [0006]
• WO 2015/127929 A1 [0007]
• WO 2014/032919 A1 [0009, 0011]
• DE 102015226320 A1 [0010, 0011]

Claims (10)

Pressure plate unit (1) for a friction clutch of a motor vehicle drive train, comprising a pressure plate (2) with a friction side (4) for frictional pressing against a clutch disc or to a clutch plate for the purpose of transmitting a torque which substantially annularly from several in the circumferential direction (30) successively arranged pressure plate segments (10) is formed, wherein at least a first pressure plate segment (11) and a second pressure plate segment (12) which are arranged adjacent to each other in the circumferential direction (30), facing each other end faces (16) and from a front side (16) the first pressure plate segment (11) has a projection (20) substantially in the circumferential direction (30) and the adjacent second pressure plate segment (12) has a recess (21) which is complementary in shape and size to the projection (20) and in which the projection (11) 20), and wherein the pressure plates are (1) furthermore a side (5) facing away from the friction side (4) of the pressure plate (2) has a ring element (3) which is designed to support at least one component of a plate spring of a friction clutch at least indirectly, characterized in that Ring element (3) in the circumferential direction (30) at least the first Anpressplattensegment (11) and the second Anpressplattensegment (12) integrally connects to each other, wherein at least one cohesive connection (15) between the first Anpressplattensegment (11) and the ring element (3) on or at the projection (20) is executed. Pressure plate unit (1) after Claim 1 , characterized in that between the projection (20) and the recess (21) forming material, a gap (22) is formed, wherein the cohesive connection (15) on or on the first Anpressplattensegment (11) and the second Anpressplattensegment ( 12) along the circumferential direction (30) through the gap (22) is limited. Pressure plate unit (1) according to any one of the preceding claims, characterized in that the cohesive connection (15) as a welded joint, in particular as a fillet weld (17) is formed. Pressure plate unit (1) according to one of the preceding claims, characterized in that at least one of the two Anpressplattensegmente (11, 12) frontally extending additional, the cohesive connection (15) realisierendes material (18) between the respective Anpressplattensegment (10) and the ring element (3) is arranged. Pressure-plate unit (1) according to one of the preceding claims, characterized in that the cohesive connection (15) between ring element (3) and projection (20) at least partially on at least one radial boundary edge (23, 24) of substantially in the circumferential direction (30 ) extending projection (20) is executed. Pressure plate unit (1) according to one of the preceding claims, characterized in that the projection (20) on the first pressure plate segment (11) comprises a radially extending extension (25) and in the second pressure plate segment (12) a correspondingly complementary formed, radially extending recess part (26 ) is trained. Pressure plate unit (1) after Claim 6 , characterized in that the cohesive connection (15) on or on the radially extending extension (25) of the projection (20) is formed. Pressure plate unit (1) according to one of the preceding claims, characterized in that the ring element (3) has a plurality of axially extending cams, wherein the cams are connected by means of integral connections (15) with the Anpressplattensegmenten (1). Pressure plate unit (1) according to one of the preceding claims, characterized in that the ring element (3) has a plurality of ramp elements, by which it is adapted to act as a counter-ramp ring of a wear-adjusting friction clutch. Coupling device, in particular friction clutch, for a motor vehicle for coupling an internal combustion engine and a transmission, comprising a pressure plate unit (1) according to one of Claims 1 to 9 and a clutch disc, which can be acted upon by means of the pressure plate unit (1) with an axial contact force, for generating a friction force on the clutch disc for the purpose of frictional transmission of torque.

Images