Method for producing a disc component, in particular a primary disc of a vibration damper device, disc component, in particular primary disc of a vibration damper device, and vibration damper device

Abstract

The invention relates to a method for producing a metal disc component (3), in particular a primary disc (4) of a vibration damper device (2), wherein, using an embossing tool (15), an axial depression (13) used to receive an alignment pin is formed in a first surface (12) of a disc body, wherein the depression (13) is formed by means of a female die (16) of the embossing tool (15) and at the same time metal material (20) axially displaced from a second surface (14) opposite the first surface (12) is shaped by means of a male die (18) of the embossing tool (15), forming a blind closing head (21) with an annular rim (22) resting against the second surface (14).

Description

[0001] Method for producing a disc component, in particular a primary disc of a vibration damper device, disc component, in particular a primary disc of a vibration damper device, and vibration damper device

[0002] The invention relates to a method for producing a metal disc component, in particular a primary disc of a vibration damper device, wherein an axial recess serving to receive a dowel pin is introduced into a first surface of a disc body using an embossing tool.

[0003] Such a metal disc component is used, for example, as the primary disc of a primary mass of a vibration damper device. Such a vibration damper device is frequently used in the automotive sector as part of a torque transmission device. The vibration damper device serves to compensate for rotational irregularities introduced by an internal combustion engine coupled to the primary mass via a damper spring arrangement, so that these rotational irregularities, introduced, for example, via a crankshaft journal, are not transmitted to an output shaft leading to a downstream transmission, which is connected to a secondary mass of the torque transmission device. The basic structure of such a torque transmission device is known; an example of such a torque transmission device can be found in DE 41 17 582 A1.

[0004] Such a disc component or primary disc is usually made from a metal sheet material and has a C-shaped cross-section at the edge to form an annular receiving space for the coil springs used for damping. Appropriate fastening options for connection to an output shaft of the internal combustion engine are provided in the area of ​​the inner circumference. In order to precisely align or center the primary disc with respect to the drive side during assembly, an axial depression, i.e. running parallel to the axis of rotation of the disc component or primary disc, is embossed into a first surface of the disc body using a embossing tool. This embossing leads to a displacement of the axially displaced metal material, which protrudes axially as a pin from the opposite second surface.Since, due to the continuously increasing compaction and use of installation space, a neighboring assembly is regularly arranged directly adjacent to the disk component or the primary disk in the fully assembled torque transmission device, i.e. components that still belong to the primary or secondary mass, the axially projecting pin must be reduced in height while simultaneously ensuring that the recess remains axially closed. This is done in a post-processing step using machining, i.e. the pin is milled off and its height reduced again so that the required installation space is provided and not restricted by the pin. This is disadvantageous in that it requires a complex additional process step that includes reclamping the disk component in a cutting tool as well as the cutting step.

[0005] The invention is based on the problem of providing a method for the simplified production of such a disc component, in particular a primary disc of a vibration damping device.

[0006] To solve the problem, in a method of the type mentioned at the outset, the invention provides that the recess is introduced by means of a die of the stamping tool and, at the same time, metallic material which is axially displaced from a second surface opposite the first surface is formed by means of a male die of the stamping tool to form a blind closing head with an annular rim which rests against the second surface.

[0007] The method according to the invention provides for the formation of the depression to be made on the first surface and the axial flattening of the peg or material pressed out on the opposite second side of the disc in a single work step. Here, an embossing tool with a die and a patrix is ​​used. The die is used to emboss the surface on the first surface, i.e. on one side of the disc, using a suitable embossing punch, while the disc component is supported on the other side of the disc via the patrix. The patrix is ​​designed in such a way that it limits the axial exit height of the material axially pressed out on this second surface and, at the same time, is deformed laterally due to the geometry of the patrix or the geometry of the mold cavity of the patrix, so that when the embossing process is completed, it rests against the second surface as a circumferential rim.Consequently, a blind closing head is formed via the male part, which on the one hand closes the axial recess towards the second surface and on the other hand builds up with a minimal height on the second surface, since the material is displaced laterally into the rim, i.e., is formed. The rim is essentially ring-shaped, i.e., formed on all sides, so that all of the axially pushed-through material can be easily formed while maintaining a minimum height of the blind closing head. Viewed from the first disc side, i.e., the first surface into which the recess is embossed, the rim essentially runs completely around the recess, but on the opposite, second disc side.

[0008] The method according to the invention thus allows the formation of the recess while simultaneously ensuring the required maximum disc thickness in the region of the recess due to the simultaneous deformation of the pressed-through material into the blind closure head provided by the invention. A post-processing step, as in the prior art for machining the pin formed there, is advantageously not required with the method according to the invention; rather, a single machining operation in one setup using only one tool is sufficient.

[0009] The axially pushed through, i.e. emerging, material is preferably formed in such a way that the height of the rim corresponds at most to half the depth of the recess. It should preferably be at most equal to or less than approximately 1 / 3 of the depth of the recess. The geometry of the male mold or the mold cavity of the male mold, which defines the geometry of the blind closing head or rim, makes it easy to adjust the height of the rim of the blind closing head by which it protrudes from the second surface. This height should be as small as possible to maximize the installation space available on the second side of the disc. To ensure sufficient material flow during this forming process, the axially emerging material should be formed in such a way that the width of the rim corresponds at most to the depth of the recess. The width of the rim should therefore not be too wide, so that the material does not have to be formed too far to the side.

[0010] Preferably, the peripheral shape of the rim corresponds to the peripheral shape of the recess. The cross-sectional shape of the male mold or the mold cavity therein is thus adapted to the cross-sectional shape of the female mold or die, but is significantly larger in diameter. This ensures a uniform material distribution across the rim.

[0011] Preferably, a slot-like recess is formed using the stamping tool. The longitudinal axis of the slot-like recess is preferably radial and perpendicular to the central axis or rotational axis of the disk component or the primary disk. Accordingly, the rim also preferably has a corresponding circumferential shape with a shorter transverse extent and a longer longitudinal extent. A corresponding locating pin, which is to be inserted into the recess for centering purposes, then preferably also has a corresponding cross-sectional shape adapted to the slot-like geometry. Alternatively, it is also conceivable for a circular recess to be formed using the stamping tool. In this case, the rim would preferably also have a round circumferential shape, just as the locating pin would have a round pin cross-section.

[0012] In addition to the method, the invention further relates to a metal disc component, in particular a primary disc of a vibration damper device, in particular manufactured according to the method described above, wherein an axial recess serving to receive a dowel pin is introduced into a first surface of a disc body. Such a disc component is characterized in that the recess is closed by a blind closing head formed by deforming the metal material axially displaced from a second surface opposite the first surface during the stamping of the recess, with an annular rim resting on the second surface. The height of the rim should correspond to a maximum of half the depth of the recess and preferably be less than half the depth of the recess. Furthermore, the width of the rim should correspond to a maximum of the depth of the recess and preferably be less than the depth of the recess.

[0013] Furthermore, the circumferential shape of the rim should correspond to the circumferential shape of the recess.

[0014] The recess can be designed as a slot-like recess or a circular recess.

[0015] In addition to the disc component itself, the invention further relates to a vibration damper device, in particular for a drive train of a motor vehicle, comprising a disc component, in particular a primary disc of the type described above.

[0016] The invention is explained below using exemplary embodiments with reference to the drawings. The drawings are schematic representations and show:

[0017] Figure 1 is a schematic diagram, in section, of a torque transmission device with a vibration damper device according to the invention comprising a disc component according to the invention in the form of a primary disc,

[0018] Figure 2 is a plan view of the torque transmission device from Figure 1,

[0019] Figures 3-5 Schematic diagrams to explain the manufacturing process of the

[0020] Recess with simultaneous formation of the blind closing head, and Figure 6 is a plan view of the first surface into which the recess is embossed, showing the course of the rim formed on the opposite 2nd surface.

[0021] Figure 1 shows a torque transmission device 1, via which an output shaft or a crankshaft journal of an internal combustion engine (not shown) can be coupled to an input shaft of a transmission (not shown). The torque transmission device 1 has a vibration damper device 2 according to the invention, comprising a disk component 3 in the form of a primary disk 4, which has a series of openings 5 ​​in the region of its inner circumference, via which it is connected to an output shaft or a crankshaft journal by means of screw connections. The primary disk 4 further has a receiving channel 6 with a C-shaped cross-section, in which a plurality of coil springs 7 are arranged, distributed around the circumference. The primary disk 4 and the coil springs 7 are part of a primary mass.The coil springs 7 are coupled to a secondary disk 8, which in turn is part of a secondary mass, which in turn is to be coupled via a toothing 9 to an input shaft (not shown in detail) of a downstream gearbox or the like. Also shown is a gear 10, which is connected to the primary disk 4. Via this gear 10, a torque generated by an electric machine, for example, can be input. Also shown is a neighboring assembly 11, which is arranged directly adjacent to the primary disk 4 and is, for example, part of the secondary mass. This neighboring assembly 11 can be, for example, a flywheel, comprising a disk on which individual mass segments are arranged or the like. The basic structure and function of such a torque transmission device 1 is known.

[0022] Figure 1, but also Figure 2, show a recess 13 introduced into a first surface 12 of the primary pulley 4, which recess is designed in the shape of an elongated hole, as shown in Figure 2. This recess 13 serves to position and center the primary pulley 4 or the torque transmission device 1 towards the drive side, i.e. towards the crankshaft side, wherein it serves to receive a correspondingly shape-compatible dowel pin which defines the positioning or centering. As already shown in Figure 1, the recess 13 is embossed on the first surface 12, but is closed towards the second, opposite surface 14. There is no appreciable overhang in this area, which will be discussed below, so that, as Figure 1 shows, the maximum installation space is available there, which allows the neighboring assembly 11 to be integrated and arranged directly adjacent to the second surface 14 of the primary pulley 4.

[0023] Figures 3 - 5 show the essential process steps of the process according to the invention, which simultaneously allows the formation of the recess 13 on the first surface 12 and at the same time the formation of a blind closing head on the opposite second surface 14, wherein this blind closing head has a minimal height, i.e. protrudes minimally into the installation space there and consequently does not adversely affect it.

[0024] Figure 3 shows a schematic diagram of the metal primary disk 4, made from sheet metal, which is clamped in a stamping tool 15. The stamping tool 15 has a die 16 with a stamping punch 17 and a male die 18 with a mold cavity 19. To form the recess, the stamping punch 17 is pressed against the first surface 12 of the disk body and pressed into it. This pressing in simultaneously leads to the axial displacement of the metal material 20. This protrudes axially at the second surface 14, on which the male die 18 is located. The material 20 is increasingly pressed out further as the stamping punch 17 continues to emboss, whereby the axial movement of the material 20 is limited by the male die 18 and the material flow is diverted to the side, as shown in Figure 4.There, the stamping die 17 is pressed in almost to its maximum depth, the material 20 has clearly been pressed into the mold cavity 19 and fills it almost completely. Once the maximum stamping depth has been reached, i.e. once the stamping die 17 has been retracted far enough to achieve the required depth of the recess 13, the stamping tool 15 is opened. Figure 5 shows the finished stamped primary disc 4 with the recess 13, which is slightly undercut here. Towards the second surface 14, the recess 13 is closed by a blind closing head 21 having a circumferential rim 22, which is formed by the deformation of the material 20 into the...

[0025] mold cavity 19 and which rests almost flat on the second upper side 14. The height H of the blind closing head 21 or the rim 22 is significantly smaller than the depth T of the recess, it is preferably smaller than 1 / 3 of the depth T.

[0026] As the top view of the first upper side 12 according to Figure 6 shows, the rim 22 runs in a quasi-annular manner; viewed from the upper side 12, it extends in a quasi-annular manner around the recess 13, which here is designed as an elongated hole. The recess 13 therefore has a longitudinal extent and a comparatively shorter transverse extent. The circumferential or edge shape of the rim 22 is correspondingly; thus, see Figure 6, it also has a longitudinal extent and a comparatively shorter transverse extent, i.e., the circumferential shape of the rim 22 corresponds to the circumferential shape of the recess 13. The width B of the rim 22 should be smaller than the depth T of the recess 13.

[0027] On the finished stamped primary disk 4, the recess 13 with the required depth and the required fit dimension is formed on the one hand by using the stamping tool 15 in a single circumferential process, and at the same time on the opposite side the blind closing head 21 with its rim 22 and the small height H, which ensures that the blind closing head 21 protrudes negligibly into the adjacent installation space.

[0028] List of reference symbols

[0029] Torque transmission device

[0030] Vibration damper device

[0031] Disc component

[0032] primary disc

[0033] breakthrough

[0034] Recording channel

[0035] coil spring

[0036] secondary disc

[0037] Gearing

[0038] gear

[0039] Neighboring assembly

[0040] surface

[0041] Deepening

[0042] surface

[0043] Embossing tool

[0044] die

[0045] Embossing stamp

[0046] male part

[0047] mold cavity

[0048] material

[0049] Blind closing head

[0050] brim

Claims

Patent claims 1. A method for producing a metal disc component (3), in particular a primary disc (4) of a vibration damper device (2), wherein an axial recess (13) serving to receive a dowel pin is introduced into a first surface (12) of a disc body using an embossing tool (15), characterized in that the recess (13) is introduced by means of a die (16) of the embossing tool (15) and, at the same time, metal material (20) which is axially displaced from a second surface (14) opposite the first surface (12) is formed by means of a male die (18) of the embossing tool (15) to form a blind closing head (21) with an annular rim (22) lying against the second surface (14).

2. Method according to claim 1, characterized in that the deformation of the material (20) takes place in such a way that the height (H) of the rim (22) corresponds at most to half the depth (T) of the recess (13).

3. Method according to claim 1 or 2, characterized in that the deformation of the material (20) takes place in such a way that the width (B) of the rim (22) corresponds at most to the depth (T) of the recess (139).

4. Method according to one of the preceding claims, characterized in that the circumferential shape of the rim (22) corresponds to the circumferential shape of the recess (13).

5. Method according to one of the preceding claims, characterized in that a slot-like recess (13) or a circular recess (13) is formed by means of the embossing tool (15).

6. Metal disc component (3), in particular primary disc (4) of a vibration damper device (2), in particular produced according to the method according to one of the preceding claims, wherein an axial recess (13) serving to receive a dowel pin is formed in a first surface (12) of a Disc body is introduced, characterized in that the recess (13) is closed by a blind closing head (21) formed by deformation of the metal material (20) which is axially displaced from a second surface (14) opposite the first surface (12) during the embossing of the recess (13), with an annular rim (22) lying against the second surface (14).

7. Metal disc component (3) according to claim 6, characterized in that the height (H) of the rim (22) corresponds at most to half the depth (T) of the recess (13), and / or that the width (B) of the rim (22) corresponds at most to the depth of the recess (13).

8. Metal disc component according to claim 6 or 7, characterized in that the peripheral shape of the rim (22) corresponds to the peripheral shape of the recess (13).

9. Metal disc component according to one of claims 5 to 8, characterized in that the recess (13) is designed as a slot-like recess (13) or a circular recess (13).

10. Vibration damper device (2), in particular for a drive train of a motor vehicle, comprising a disc component (3), in particular a primary disc (4) according to one of claims 6 to 9.

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