HK40006494B - Method for manufacturing disc carrier - Google Patents

Description

Method for manufacturing disc carrier

Technical Field

The invention relates to a disk carrier with

A cylindrical peripheral wall having a first peripheral wall section with a first diameter and a second peripheral section with a second diameter axially coupled thereto, wherein the second diameter is larger than the first diameter and the first and second peripheral sections are connected to each other via a radial annular shoulder,

a web-like axial disk which is molded on the inside of the first peripheral section and/or the second peripheral section, and

an annular groove which is formed on the inner side of the annular shoulder and between the second circumferential section and a radially inner, axially projecting groove wall which has a radial recess.

Background

The disk carrier (also referred to as clutch disk carrier) is a component part which is used in a clutch of a vehicle transmission. The disk carrier is of substantially pot-shaped design and has a radially extending hub region and an axially extending cylindrical peripheral wall region. Axially extending webs (Stege), which are referred to as disks and serve to hold and guide the clutch disk, are arranged along the inner side of the circumferential wall.

In particular, disk carriers with cylindrical peripheral walls are known for dual clutch transmissions, which have a first peripheral wall section with a first diameter and a second peripheral section with a second, larger diameter, which is axially coupled to the first peripheral wall section. It is known to weld disc carriers of this type from two or more components.

The soldered connections are production-technically costly.

It is also known to produce simple disc carriers from a starting workpiece by means of roll pressing (Druckwalzen). However, in the case of a disk carrier with two peripheral sections of the peripheral wall which are offset from one another, there is the problem that an annular groove can be provided for conveying oil between the two peripheral sections in the radial shoulder region. In this case, the annular groove is formed between the second circumferential wall section and a radially inner, axially projecting, annular groove wall. The groove walls are provided with radial notches in order to convey the oil flow in a desired manner.

In the case of a disk carrier shaped by rolling, such a specially shaped radial shoulder region cannot be shaped in the desired manner, or at least cannot be shaped precisely. It is therefore known to provide a cutting rework in the case of such disk carriers for the formation of the annular groove and the groove wall with the radial recess. However, a further machining of such cuts in the can-shaped disk carrier is costly in terms of production technology and can only be carried out to a limited extent.

Disclosure of Invention

The object of the invention is to provide a disk carrier which can be produced in a simple manner and is accurate in shape.

The object is achieved according to the invention by a method for producing a disk carrier having a disk carrier

A cylindrical peripheral wall having a first peripheral section with a first diameter and a second peripheral section with a second diameter coupled axially to the first peripheral section, wherein the second diameter is larger than the first diameter and the first and second peripheral sections are connected to each other via a radial annular shoulder,

-a web-like axial disc molded at the inner side of the first and/or second peripheral section, and

an annular groove which is formed on the inside of the annular shoulder and between the second circumferential section and a radially inner, axially projecting groove wall which has a radial recess,

wherein the content of the first and second substances,

the disc carrier is formed in one piece from an initial workpiece by a stamping roll having the first peripheral section, the second peripheral section and the peripheral wall of the axial disc, and

-the annular shoulder with the annular groove and the groove wall with the radial indentation is preformed or finish-formed before the press-rolling. Preferred embodiments are described in other embodiments of the present invention.

The disk carrier according to the invention is characterized in that the disk carrier is formed in one piece from a starting workpiece by means of a pressing roll (absterckwafen) with the first circumferential section, the second circumferential section and the circumferential wall of the axial disk, in which starting workpiece an annular shoulder with the annular groove and the groove wall with the radial recess is formed before the pressing roll.

The basic idea of the invention is to produce the disk carrier in one piece by means of a punching and rolling operation from a starting tool in which an annular shoulder region with the groove wall and the recess has been preformed and/or finished. Here, the initial workpiece likewise has a first peripheral section and a second peripheral section, which are however axially smaller than the peripheral section of the finished disk carrier, but are thicker in terms of wall thickness.

The invention is based on the recognition that such a preformed radial region is not deformed, in any case not significantly deformed, during the stamping and rolling of the peripheral section. This makes it possible to produce a disk carrier which, in its peripheral section, has a structure (Gef ugestruktur) which is cold-hardened by the press-rolling, while the structure of the initial workpiece is hardly changed in the region of the annular shoulder.

This makes it possible to produce disk carriers which have precisely produced annular shoulder regions and which are nevertheless effectively produced in one piece by means of roll pressing or stamp rolling.

In principle, the initial workpiece can be produced at will, for example by casting, reshaping or machining. It is particularly advantageous according to an embodiment variant of the invention if the initial workpiece is a forged workpiece. The entire workpiece can thereby be produced particularly efficiently and with high strength.

A further preferred embodiment of the invention provides that the annular shoulder with the annular groove and the groove wall with the radial recess is formed in a cutting manner. This enables an initial workpiece with a relatively small axial length to be machined efficiently and with high precision, for example by means of a lathe or a milling machine. In particular, the annular groove and the radial recess can thereby be produced efficiently.

The development according to the invention advantageously provides that the axial disks at the first circumferential section and/or the second circumferential section are arranged uniformly distributed over the circumference and extend at least along an axial partial section of the circumferential wall. Preferably, the axial disk (which can also be referred to as a web) extends substantially over the entire axial length of the first and/or second peripheral section. The disks can be shaped in a press-rolling process, in which the material is shaped into corresponding profiled sections at a press chuck (druckfuser).

A further advantageous embodiment of the invention provides that the axial disk at the second circumferential section extends axially from the annular shoulder to a free end of the circumferential wall. The second circumferential section can thereby be used, for example, for holding and guiding the clutch disk over its entire axial length.

In principle, the circumferential wall of the pot-shaped disc carrier can be closed. For a certain operating principle, it is advantageous according to an embodiment variant of the invention to introduce openings in the peripheral wall. The openings can be introduced after the rolling by a corresponding material-removing process.

In order to effectively connect the disk carrier to the drive shaft, according to a development of the invention, a sleeve-shaped hub is arranged in the radial hub region. The hub can preferably be provided with a wedge-shaped groove profile (keilnutprofile) in order to produce a form-fitting hub connection.

In principle, the invention is not limited to disc carriers. The invention also comprises a method for manufacturing a disc carrier with

A cylindrical peripheral wall having a first peripheral wall section with a first diameter and a second peripheral section with a second diameter axially coupled thereto, wherein the second diameter is larger than the first diameter and the first and second peripheral sections are connected to each other via a radial annular shoulder,

a web-like axial disk which is molded on the inside of the first peripheral section and/or the second peripheral section, and

an annular groove which is formed on the inside of the annular shoulder and between the second peripheral section and a radially inner, axially projecting groove wall which has a radial recess, wherein it is provided that the disk carrier is formed in one piece from an initial workpiece by means of a stamping roll with the first peripheral section, the second peripheral section and a peripheral wall of the axial disk, in which initial workpiece the annular shoulder with the annular groove and the groove wall with the radial recess is formed before the stamping roll.

The method is preferably used for producing the disk carrier described above and the embodiment variants described thereof.

Drawings

The invention will be further described hereinafter with the aid of preferred embodiments which are schematically shown in the drawings. In the drawings:

FIG. 1 shows a partial cross-sectional view of a disc carrier according to the present invention;

fig. 2 shows a front view of the disc carrier of fig. 1 on a reduced scale;

FIG. 3 shows a detailed cross-sectional view of the disc carrier of FIG. 1;

FIG. 4 shows a perspective view of an initial workpiece; and

fig. 5 shows a further perspective view of the initial workpiece of fig. 4.

Detailed Description

The construction of the disc carrier 10 according to the invention is described in connection with fig. 1 to 3. The pot-shaped disk carrier 10 has a stepped cylindrical peripheral wall 20 and a disk-shaped hub region 12, in the middle of which a sleeve-shaped hub 14 is formed. The peripheral wall 20 comprises a first peripheral section 21 with a first diameter and a second peripheral section 22 with a second diameter. The second diameter of the second peripheral section 22 is greater than the first diameter of the first peripheral section 21.

The second circumferential section 22 is connected to the first circumferential section 21 via an annular shoulder 30. A first web-like disk 23 projecting radially inward is formed on the cylindrical inner side of the first circumferential section 21. In a similar manner, a tab-shaped second disk 24 is formed on the inside of the second peripheral section 22, which extends from the annular shoulder 30 to a free end of the peripheral wall 20. Between the second disks 24 of the second circumferential section 22, two openings 28 are formed in each intermediate space.

An annular groove 32 is formed on the inside of the annular shoulder 30 between the second circumferential section 22 and an annular groove wall 34 arranged radially inside. The recesses or indentations 34 are introduced at regular intervals into the groove wall 34, wherein axial projections 38 are formed between the recesses or indentations. The axial projection 38 serves as an axial stop surface for a clutch disk which can be arranged inside the second peripheral section 22. Via the annular groove 32 and the recess 36, lubricant and/or air can be exchanged between these two regions of the clutch that are present at the first circumferential section 21 and the second circumferential section 22 during operation of the disk carrier 10. The inner side 25 of the first circumferential section 21 merges smoothly into the inner side at the annular groove wall 34.

The disc carrier 10 is produced from an initial workpiece 50, which is preferably formed as a forged part and is shown visually in fig. 4 and 5. The rotationally symmetrical starting workpiece 50 has a hub region 12 with a sleeve-shaped hub 14, which are preferably shaped in correspondence with the hub region 12 and the hub 14 of the produced disk carrier 10.

At the sleeve-shaped starting workpiece 50, a circumferential wall is arranged with a first wall region 51 and a second wall region 52 which is connected thereto. The wall thickness of the two wall regions 51, 52 of the initial workpiece 50 is greater than the wall thickness of the first and second peripheral sections 21, 22 of the finished disc carrier 10. These two wall regions 51, 52 are thinned and elongated by press rolling and finally formed into the first peripheral section 21 or the second peripheral section 22.

A radial shoulder 30 with the annular groove 32 and the groove wall 34 is formed between the first wall region 51 and the second wall region 52 on the initial workpiece 50. The recess 36 and the projection 38 are formed in a corresponding manner on the groove wall 34. The final shaping of the groove walls 34 can be carried out directly in the forging or preferably by a machining by cutting, which is preceded by the pressing and rolling.

Claims (7)

1. Method for producing a disc carrier having

-a cylindrical peripheral wall (20) having a first peripheral section (21) with a first diameter and a second peripheral section (22) with a second diameter coupled axially thereto, wherein the second diameter is larger than the first diameter and the first peripheral section (21) and the second peripheral section are connected to each other via a radial annular shoulder (30),

-a web-like axial disc (23, 24) moulded at the inner side of the first peripheral section (21) and/or the second peripheral section (22), and

-an annular groove (32) which is formed at the inner side of the annular shoulder (30) and between the second peripheral section (22) and a radially inner, axially projecting groove wall (34) which has a radial recess (36),

it is characterized in that the preparation method is characterized in that,

-the disc carrier (10) is formed in one piece from an initial workpiece (50) by a stamping roll having the first peripheral section (21), the second peripheral section (22) and a peripheral wall (20) of the axial discs (23, 24), and

-preforming or finishing the annular shoulder (30) with the annular groove (32) and the groove wall (34) with the radial recess (36) before the press rolling.

2. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

it is characterized in that the preparation method is characterized in that,

the initial workpiece (50) is a forged workpiece.

3. The method according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the annular shoulder (30) having the annular groove (32) and the groove wall (34) having the radial recess (36) is configured to be cut.

4. The method according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the axial disks (23, 24) at the first circumferential section (21) and/or the second circumferential section (22) are arranged uniformly distributed over the circumference and extend at least along an axial partial section of the circumferential wall (20).

5. The method according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the axial disk (24) at the second peripheral portion (22) extends axially from the annular shoulder (30) to a free end of the peripheral wall (20).

6. The method according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

an opening (28) is introduced in the peripheral wall (20).

7. The method according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the disc carrier has a radial hub region (12), wherein a sleeve-shaped hub (14) is arranged at the radial hub region (12).