EP3953594A1

EP3953594A1 - Disc for a multi-disc clutch, multi-disc clutch having the disc, and method for producing the disc

Info

Publication number: EP3953594A1
Application number: EP20718581.0A
Authority: EP
Inventors: Martin Kaufmann; Frank Siepermann; Thomas Schupp
Original assignee: ZF Friedrichshafen AG
Current assignee: ZF Friedrichshafen AG
Priority date: 2019-04-08
Filing date: 2020-04-01
Publication date: 2022-02-16
Also published as: US20220163069A1; CN113646553A; DE102019204988A1; WO2020207878A1

Abstract

Multi-disc clutches are known which usually have a first clutch pack consisting of steel discs and a second clutch pack consisting of friction discs. An object of the invention is to create a disc which has a particularly cost-effective design. To this end, a disc (1) for a multi-disc clutch is proposed, which has a disc body (2), the disc body (2) being in the form of an annular disc, and the disc body (2) having a driver contour (5) on its inner circumference (4) and/or outer circumference (3) for mounting the disc (1) in a rotationally fixed manner, wherein the disc body (2) is formed by edgewise rolling on the inner circumference (4) thereof.

Description

Disk for a disk clutch, disk clutch with the disk as well

Method of manufacturing the lamella

The invention relates to a disk for a disk clutch with the features of the preamble of claim 1. Furthermore, the invention relates to a disk clutch with a plurality of the disks and a method for producing the disk.

There are known multi-disk clutches which usually have a first disk pack made of steel disks and a second disk pack made of friction disks. The lamellae of the two lamella packs are arranged in alternating order, the lamellae being able to be brought into contact with one another to form a frictional connection, for example between two shafts. The steel and friction disks are usually made as closed rings by punching from sheet metal.

The document DE 10 2015 114 673 A1, which probably forms the closest prior art, discloses a friction plate for a friction clutch, with an annular plate body made of steel, which is provided on one of its peripheral edges with a driver geometry, the friction surfaces made of the material the lamellar body consists.

The invention has set itself the task of creating a lamella of the type mentioned, which is characterized by a particularly inexpensive design. It is also an object of the invention to propose a corresponding multi-disc clutch and a method for producing the disc.

According to the invention, this object is achieved by a disk having the features of claim 1, a disk clutch having the features of claim 9 and a method having the features of claim 10. Advantageous embodiments result from the subclaims, the drawings and the description. The invention relates to a disk which is designed and / or suitable for a disk clutch. In particular, the lamella is used to form a frictional connection and / or a force fit in a circumferential direction with at least or precisely one adjacent lamella. The lamella can be designed as an intermediate lamella or as a friction lamella.

The lamella has a lamella body which is designed as an annular disk, in particular an annular disk that encircles a central axis. The lamellar body preferably has a rectangular or at least approximately rectangular cross-sectional profile, with an axial dimension of the cross-sectional profile being smaller than a radial dimension of the cross-sectional profile with respect to the central axis. Thus, the cross-sectional profile of the lamella body is oriented upright in the radial direction with respect to the central axis. The lamellar body is preferably made of a metallic material, preferably steel.

The lamellar body has a driving contour on its inner circumference. Alternatively or optionally in addition, the lamellar body has the entrainment contour or another entrainment contour on its radial outer circumference. In particular, the inner circumference is defined by a radial inner edge curved around the central axis and the outer circumference by a radial outer edge of the annular disk curved around the central axis. The entrainment contour is designed and / or suitable for the non-rotatable assembly of the lamella. The entrainment contour is preferably used for the rotationally fixed mounting of the lamella on a lamella carrier and / or a shaft with a corresponding mating contour. In principle, the entrainment contour can be designed as a feather connection. Preferably, however, the driving contour is designed as a driving profile encircling the central axis.

In the context of the invention it is proposed that the lamellar body is formed by upright rollers on its inner circumference. In particular, when Hochkantrol len a linear or preformed, for example curved, strip of material, upright with means of a rolling tool around a bending axis to the annular disc plastically deformed, in particular rolled, the central axis corresponding to the bending axis. "On edge" is to be understood to mean that the material strip in relation to the The bending axis is deformed in a radial plane, the strip of material with its rectangular cross-sectional profile being aligned upright in the radial plane.

In particular, the rolling tool, e.g. a roll or a roller, unrolled on egg ner longitudinal edge of the strip of material so that the strip of material experiences a constant bend about the central axis. The material strip is particularly preferably reshaped by at least approximately 360 degrees around the central axis, so that the two end faces of the material strip are opposite one another in the circumferential direction. The annular disk is thus preferably shaped as a ring that is interrupted in the circumferential direction, in particular an open, disk-shaped ring.

The advantage of the invention is, in particular, that the upright rolling of the scrap, which arises in particular in the punching process known from the prior art, is significantly reduced or does not arise at all. The lamellas can thus be produced in a particularly material-saving and thus inexpensive manner. In addition, a manufacturing process that is gentle on the material and tools is proposed, so that the tool costs can also be reduced.

In a preferred embodiment of the invention it is provided that the lamella steering body has two opposite end sections in the circumferential direction. In particular, the two end sections are defined as the two end faces of the material strip. The two end sections can bear against one another in the circumferential direction. In particular, the two end sections are in direct contact with one another, so that the two end sections make linear contact with one another in the circumferential direction and / or are in flat contact with one another. Alternatively, however, the two end sections can also rest indirectly against one another, wherein, for example, an intermediate layer, for example an adhesive layer, can be arranged between the two end sections. Alternatively, the two end sections are slightly spaced from one another in the circumferential direction. In particular, “slightly spaced” is to be understood as meaning that the two end sections are separated from one another by an air gap. In particular, the two end sections are arranged at a distance of less than 1 mm, preferably less than 0.5 mm, especially less than 0.1 mm, from one another. In a preferred embodiment of the invention it is provided that the two end sections are connected to one another in the circumferential direction by means of a joining process. The joining process is preferably selected from one of the process groups according to DIN 8593. In particular, the end sections are positively and / or cohesively and / or non-positively connected to one another in the circumferential direction. The two end sections are preferably connected to one another in a non-detachable manner or at least to a limited extent.

It is particularly preferably provided that the two end sections are connected to one another by welding, in particular joint welding. For example, the two end sections can be materially connected to one another by laser welding. Alternatively or optionally, the two end sections are connected to one another by forming. The two end sections are preferably connected to one another in a form-fitting and / or force-fitting manner by clinching, also known as “clinching”.

In a further preferred specification of the invention, it is provided that the entrainment contour is introduced into the lamellar body by means of a cutting process. The entrainment contour is preferably introduced into the lamellar body by non-cutting cutting. In particular, the driving contour is introduced into the lamellar body by dividing it, preferably in accordance with DIN 8588. Particularly preferably, the entrainment contour is introduced into the lamellar body after the upright rolling, in particular after the joining of the end sections.

It is particularly preferably provided that the entrainment contour is introduced into the lamella body by fine cutting. Alternatively or optionally, the entrainment contour is introduced into the lamellar body by punching. The lamellar body is preferably processed in a punch press, the entrainment contour being introduced into the lamellar body by means of a stamp. In particular, the lamellar body is held in place by what is known as a ring spike during fine blanking.

In a preferred development it is provided that the entrainment contour, in particular special with respect to the central axis, a plurality of uniformly in the circumferential direction direction of distributed and aligned in the radial direction projections and / or recesses ments. In particular, the projections and / or recesses can have a round and / or angular and / or pointed, in particular tooth-like, contour. In particular, the entrainment contour extends in the circumferential direction over the entire inner circumference or outer circumference. The projections and / or recesses are preferably arranged distributed in the circumferential direction in such a way that, in particular, the two end sections together, in particular in equal parts, form a projection and / or a recess. In particular, the entrainment contour is designed as a spline.

In a further specification, it is provided that the lamella is designed as a friction lamella, the lamella body having a friction surface at least or precisely on one side, but preferably on both sides. In particular, he stretches the friction surface in a radial plane with respect to the central axis. The friction surface is preferably defined by an annular surface of the annular disk. The friction surface can extend over the entire surface of the circular ring surface. Alternatively, however, the friction surface can also extend in sections and / or circumferentially, interrupted, over the circular ring surface. In particular, the friction surface can be integrated directly into the disk body. For example, the friction surface can be implemented by structuring, in particular corrugation, introduced into the lamellar body. Alternatively, the friction surface is formed by a friction lining which is applied to the at least one side of the lamellar body. For example, the friction lining can be designed as a paper friction lining.

Another object of the invention relates to a multi-disc clutch, in particular for a vehicle, with several of the discs as already described above. The multi-disc clutch is preferably designed as a drive clutch or as a brake clutch. In particular, the multi-plate clutch formed as a drive clutch serves to interrupt a torque between two shafts. In particular, the multi-plate clutch designed as a brake clutch is used to generate a braking torque between a shaft and a stationary component, for example a housing. The multi-disc clutch can be used as a switchable clutch, such as that used in a manual transmission of a motor vehicle. will be trained. Alternatively, the multi-plate clutch can, however, also be designed as a non-switchable multi-plate clutch, as these are used for example as a differential lock in a differential gear of a motor vehicle.

According to the invention, the multi-disk clutch comprises a first disk pack with disks which have the driving contour on their inner circumference and a second disk pack with disks which have the driving contour on their outer circumference. In particular, the lamellae of the first lamella set are designed as inner lamellae which, for example, are non-rotatably but axially displaceably connected and / or connectable to a shaft or an inner disk carrier. In particular, the disks of the second disk pack are designed as outer disks, which are connected and / or connectable, for example, in a rotationally fixed but axially displaceable manner to a hollow shaft or an outer disk carrier. The lamellae of the first and / or the second lamellae pack are preferably designed as the friction lamellas. The lamellas of the first and second lamella packs are arranged alternately one behind the other. Particularly preferably, the lamellae of the first and / or the second lamella pack are formed into the annular disk by rolling the respective lamella body upright on its inner circumference.

Another object of the invention relates to a method for producing a lamella as already described above. The process comprises the following steps:

- providing an elongated strip of material with a first and a second longitudinal edge;

- Forming the material strip around a bending axis by rolling it upright on one of the two longitudinal edges, so that the annular lamellar body is formed,

- The inner circumference being defined by the longitudinal edge machined by edgewise rollers and the outer circumference being defined by the other longitudinal edge. The strip of material is particularly preferably linear and / or strip-shaped. In particular, the material strip is designed as a metal strip, preferably as a sheet metal strip, especially as a sheet steel strip. The two longitudinal edges are preferably designed as two parallel, in particular rectangular, longitudinal sides of the material strip with respect to a longitudinal axis, which are spaced apart from one another by a width. In addition, the material strip has two parallel, in particular rectangular, sides, preferably a front side and a rear side, which are spaced apart from one another by a thickness. Particularly preferred is “elongated” to the effect that an axial longitudinal extension of the material strip in relation to the longitudinal axis is many times greater than the width of the material strip. The width of the material strip is preferably many times greater than the thickness of the material strip. In particular, the material strip is set up on edge during the forming process, so that the front or rear side of the material strip is arranged in a radial plane of the bending axis and / or the first and / or second longitudinal edge is perpendicular to the radial plane.

In a further process step, the two end sections are connected to one another after the edgewise rolling by joining, in particular by welding or by forming. In an alternative or optional additional process step, the entrainment contour is introduced into the lamellar body after rolling upright by cutting, in particular by fine cutting and / or punching.

The present invention is further explained below with reference to the drawing, further advantages, features and effects of the description of the figures being to be taken. Show it:

Figure 1 is an axial view of a disk for a disk clutch as an Ausfüh approximately example of the invention;

FIGS. 2a, b show a schematic representation of a blank of the lamella and a method for producing the lamella from FIG. FIG. 1 shows, in an axial view with respect to a central axis MA, a lamella 1, which is designed and / or suitable, for example, for a lamella clutch of a vehicle. The lamella 1 has a lamella body 2 which is designed as an annular disk. For example, the lamellar body 2 is made of a metallic material, in particular steel.

The lamellar body 2 has an inner and an outer circumference 4, 3, the lamellar body 2 having an entrainment contour 5 on its inner circumference 4 for the non-rotatable connection of the lamella 1. Thus, the lamella 1 is designed as an inner lamella, wherein the lamella 1 can be connected non-rotatably via the entrainment contour 5, for example with a shaft with a corresponding counter-contour or with an inner lamella carrier. The entrainment contour 5 is formed by a large number of recesses 6, which are introduced into the lamellar body 2 in the circumferential direction about the central axis MA at a uniform distance from one another. Thus, a fitting toothing is formed which has teeth directed radially inward. For example, the recesses 6 are made in the lamellar body 2 by fine cutting or punching.

The lamellar body 2 is designed to be interrupted in the circumferential direction around the central axis MA, so that a first and a second end section 7a, b are formed. The two end sections 7a, b are arranged opposite one another and together form a tooth of the entrainment contour 5. For example, the two end sections 7a, b rest against one another in the direction of rotation or are arranged slightly spaced from one another. For example, the two end sections 7a, b can be firmly connected to one another in a materially bonded manner, for example by welding or gluing, or positively and / or non-positively, for example by clinching.

For example, the lamella 1 is designed as a friction lamella, wherein the lamella steering body 2 has a friction surface 9 on its side 8, in particular on the front and / or rear side. The friction surface 9 is defined by an annular surface of the annular disk-shaped lamellar body 2 and / or is arranged on this.

The friction surface 9 thus extends in relation to the central axis MA in a radius a level. For example, the friction surface 9 can be integrated into the lamellar body 2, with a grid-like structure being introduced into the side 8 of the lamellar body 2, for example. Alternatively, however, the friction surface 9 can also be formed by a friction lining, not shown, with the friction lining 9 being applied to the side 8 of the lamellar body 2, in particular its circular ring surface. For example, the friction lining 9 can be formed by a coating.

The lamellar body 2 is machined on its inner circumference 4 by edgewise rolling, so that the lamellar body 2 is shaped about the central axis MA to form the ring disk. The method for producing the lamella body 2 by upright rolling is described in greater detail below with reference to FIGS. 2a, b.

FIG. 2a shows schematically in a perspective representation an elongated strip of material 10 which forms a blank of the lamella 1 from FIG. For example, the strip of material 10 is formed as a band-shaped flat steel strip which has an elongated shape with respect to a longitudinal axis LA. The material strip 10 has a first and a second axial end face 11a, b in relation to the longitudinal axis LA, the first end face 11a having the first end section 7a, as shown in FIG. 1, and the second end face 11b the second end section 7b , as shown in Figure 1, forms. The two end faces 11 a, b are spaced apart from one another by a length L in relation to the longitudinal axis LA and are designed as a rectangular surface. The material strip 10 also has a first and a second longitudinal edge 12a, b, the two longitudinal edges 12a, b being arranged parallel to one another with respect to the longitudinal axis LA and being spaced apart from one another by a width B. The length L of the material strip 10 is many times greater than the width B of the material strip 10. The material strip 10 has a front side 13a and a rear side 13b, the front side 13a and the rear side 13b being spaced from one another by a thickness D. The width B is many times greater than the thickness D of the material strip 10.

As shown in Figure 2b, the material strip 10 is set up on edge with respect to a bending axis BA, the material strip 10 for this purpose with its sides 13a, b each extends in a radial plane of the bending axis BA. For reshaping in the annular disc-shaped lamellar body 2, the material strip 10 is, for example, rolled upright on its second longitudinal edge 12b by a rolling tool 14, so that the two longitudinal edges 12a, b are reshaped with a uniform curvature around the bending axis BA, as shown schematically by a dashed illustration is indicated. The first longitudinal edge 12a defines the outer circumference 3 and the second longitudinal edge 12b defines the inner circumference 4, as shown in FIG. The strip of material 10 is processed by the rolling tool 14 until the two end faces 11 a, b or the two end sections 7a, b are reshaped by at least approximately 360 degrees around the bending axis BA, so that the annular disc forms ge and the bending axis BA Central axis MA of the lamellar body 2 is defined.

The two end sections 7a, b can then be connected to one another in a joining process and the entrainment contour 5 can be introduced into the lamellar body 2 in a separating process.

By reshaping the strip of material 10 by edgewise rolling, a lamella 1 can thus be manufactured in a particularly simple manner, with waste and thus material costs being significantly reduced compared to the punching process known from the prior art. Through the use of edgewise rolled strips of material 10, the material used can thus be used to 100% who the.

Reference symbol

1 slat

2 lamellar bodies

3 outer circumference

4 inner circumference

5 driving contour

6 recesses

7a first end section

7b second end section

8 page

9 friction surface

10 strips of material

11 a first face

11 b second face

12a first longitudinal edge

12b second longitudinal edge

13a front

13b back

14 Rolling Tool

B width

D thickness

L length

BA bending axis

LA longitudinal axis

MA central axis

Claims

1. Disk (1) for a disk clutch, with a disk body (2), wherein the disk body (2) is designed as an annular disk, and wherein the Lamellenkör by (2) on its inner circumference (4) and / or its outer circumference (3 ) has a Mitnah mekontur (5) for rotationally fixed mounting of the lamella (1), characterized in that the lamella body (2) is formed by upright rollers on its inner circumference (4).

2. lamella (1) according to claim 1, characterized in that the lamellar body (2) has two opposite end sections (7a, 7b) in the circumferential direction, the two end sections (7a, 7b) lying against one another in the circumferential direction or being slightly spaced apart .

3. Lamella (1) according to claim 1 or 2, characterized in that the two end sections (7a, 7b) are connected to one another in the circumferential direction by means of a joining process.

4. Lamella (1) according to one of the preceding claims, characterized in that the two end sections (7a, 7b) are connected to one another by forming and / or welding.

5. Lamella (1) according to one of the preceding claims, characterized in that the entrainment contour (5) is introduced into the lamella body (2) by means of a separation process.

6. lamella (1) according to one of the preceding claims, characterized in that the entrainment contour (5) formed by fine blanking and / or punching is introduced into the lamella body (2).

7. lamella (1) according to any one of the preceding claims, characterized in that the entrainment contour (5) has a plurality of uniformly ver distributed in the circumferential direction and aligned in the radial direction projections and / or recesses (6).

8. lamella (1) according to any one of the preceding claims, characterized in that the lamella (1) is designed as a friction lamella, wherein the lamella body (2) at least on one side (8) has a friction surface (9).

9. Multi-plate clutch with multiple plates (1) according to one of the preceding claims, characterized by a first plate pack with plates (1) which have the entrainment contour (5) on their inner circumference (4) and by a second plate pack with plates (1) have the entrainment contour (5) on their outer circumference (3), the lamellae (1) of the first and second lamella pack being arranged alternately one behind the other.

10. A method for producing a lamella (1) according to one of the preceding claims, in which:

- An elongated metal strip having a first and a second longitudinal edge (12a, 12b) is provided;

- the metal strip on one of the two longitudinal edges (12a, 12b) is formed by rolling upright around a bending axis (BA) so that the lamellar body (2) is formed,

- An inner circumference (4) of the lamellar body (2) is defined by the longitudinal edge (12a, 12b) machined by edgewise rollers and an outer circumference (3) of the lamellar body (2) by the other longitudinal edge (12a, 12b).

11. The method according to claim 10, characterized in that the two Endab sections (7a, 7b) are connected to each other by joining after the edgewise rolling.

12. The method according to claim 10 or 11, characterized in that the acquisition contour (5) is introduced after the edgewise rolling by separating in the annular lamellar body (2).