EP1966511A2

EP1966511A2 - Method for producing a rocker pressure piece and embossing device

Info

Publication number: EP1966511A2
Application number: EP06828584A
Authority: EP
Inventors: Martin Vornehm; Andreas Triller; Werner Gruca; Felix Schmitz
Original assignee: LuK Lamellen und Kupplungsbau Beteiligungs KG; LuK Lamellen und Kupplungsbau GmbH
Current assignee: Schaeffler Buehl Verwaltungs GmbH; LuK Lamellen und Kupplungsbau GmbH
Priority date: 2005-12-21
Filing date: 2006-12-01
Publication date: 2008-09-10
Also published as: DE112006003207A5; JP2009520602A; WO2007076751A2; WO2007076751A3; KR20080077999A; CN101341352A

Abstract

The invention relates to a method of producing a rocker pressure piece for a flat link chain, especially a CVT chain, according to which a shaped wire is cambered along at least one defined section in the longitudinal direction and is then separated in this section. The invention also relates to an embossing device for producing a rocker pressure piece of a chain rocker joint from a shaped wire. Said device comprises a housing having a lower housing half as the female mold and an upper housing half for guiding at least one coining die for embossing the shaped wire. The invention also relates to a rocker pressure piece of a chain rocker joint for a flat-link chain, especially a CVT chain, which extends through a recess of a link of the flat link chain, back surfaces of the rocker pressure pieces of a pair of rocker pressure pieces facing away from each other having contact surfaces for contacting the inner edge of the recess and rolling surfaces being provided on the faces of the rocker pressure pieces of a pair of rocker pressure pieces facing each other. According to the invention, at least the rolling surfaces of every rocker pressure piece are cambered.

Description

Method for producing a weighing pressure piece and embossing device

The present invention relates to a method for producing a rocker-type pressure piece of a chain-type rocker joint, in particular for a CVT chain. Furthermore, the present invention relates to an embossing device for producing a rocker pressure piece and moreover to a rocker pressure piece for a chain-type rocker joint, in particular for a CVT chain.

For example, from vehicle technology, a link chain for a conical-pulley transmission is known. The link chain is also referred to as a CVT chain and serves as a means for belt torque transmission for a CVT transmission. Such a link chain comprises tabs which are arranged in a plurality of rows arranged next to one another in a predetermined pattern in succession with respect to the length direction of the link chain. Each tab has a recess, which are penetrated by two pairs of rocker we almost as bolts or pins. In this case, two adjacent tabs are each hinged together by a pair of Wiegedruckstückpaar as a chain-swing joint. Each rocker pair has two rocker links. The cradles are based in the longitudinal direction of the link chain each with their sides facing away from each other on the inner edge of the recess of the respective tab on contact surfaces. A bending of the link chain is made possible by the fact that the cradles of a chain-type cradle pivot each other. In the process, the rocker pressure plates roll against one another on the rolling surfaces located on mutually facing sides.

The present invention has for its object to provide a method for producing a rocker pressure piece and an embossing device for producing a rocker pressure piece and a rocker pressure piece itself, with a relief of the tabs of a plate chain is made possible in the torque transmission.

Accordingly, there is proposed a method for manufacturing a cradle of a chain cradle hinge for a link chain, particularly for a CVT link chain or the like, in which a tread wire or the like is cambered along at least a predetermined portion in the longitudinal direction and then separated at that portion. The profiling, and thus the thickness, of the weighing element or of the subsequent weighing pressure piece according to the invention can be achieved by the bowing or deformation of the profile wire. change pressure piece along a predetermined section. By this deformation, in the use of the produced rocker pressure piece as a chain-weighing joint in a link chain advantageously relief in particular at the edge regions of each tab, z. B. in a CVT link chain, realized. In particular, a greater elongation, in particular of the edge flap of a plate-link chain, which advantageously contributes to an increase in the strength, can be made possible by the weighing pressure pieces produced according to the invention. The method according to the invention thus produces particularly process-reliable and inexpensive rocker pressure pieces for a link chain.

In addition to the inventively provided crowning of the formed as a rocker pressure piece profile wire other deformation possibilities are used, such. B. by strong stretching a predetermined portion of the profile wire could also be deformed, but encounters this type of deformation limits of process capability. In particular, the tabs of the tab chains can flow and tear. Furthermore, the production in such a deformation is relatively complex and labor intensive. Thus, the crowning of the profile wire is particularly advantageous in every respect.

In an advantageous embodiment of the method according to the invention can be provided that each separated profile wire is formed as a rocker pressure piece with at least one cambered rolling surface for rolling on a corresponding rolling surface of a rocker pressure piece. By the crowning of the corresponding rolling surfaces of two rocker pressure pieces of a rocker pressure piece pair for the articulated connection of two lugs of a link chain, a particularly favorable force curve, in particular at an edge lug of the link chain, can be achieved.

According to a next development of the invention can also be provided that each separated profile wire is formed as a rocker pressure piece with at least one cambered contact surface for engagement with an inner edge of a recess of a tab. In addition to the crowning of the rolling surfaces, it is also conceivable that the contact surfaces are also or exclusively cambered. The cambered contact surfaces are used for optimal concerns on the inner edge of the recess of a tab. Again, preferred radii can be realized by the inventive crowning of these sections of the rocker element.

In the method according to the invention, it is particularly advantageous if a deformation or crowning is performed on an uncured material, so that only the cambered rocker pressure piece is cured after separation. In this way, the wire Profile be taken as a continuous wire from a roll and initially the crowning carried out to perform the cure only after knocking off a certain area of the profile wire. Thus, an additional manipulation of the parts can be saved because the forming has already been done on the endless wire.

The bombing or forming according to the invention is such that a very high precision of the degree of deformation is made possible by a force control. This is in contrast to the usual way controls by stops on forming tools. In addition, in the forming according to the invention, residual stresses are generated in the rocker pressure piece or in the profile wire, which further increases the breaking strength of the rocker pressure piece, similar to how the tab strength increases when the warp is stretched.

The object according to the invention is also achieved by a stamping device for producing a rocker pressure piece of a chain-type rocker joint from a profile wire. Accordingly, an embossing device, in particular for carrying out the aforementioned method is proposed, which comprises a housing having a lower housing half as a die and an upper housing half for guiding a stamping die for crowning the profile wire. Preferably, with the embossing device according to the invention, a previously described rocker pressure piece can be embossed or cambered.

In order to enable the inventive deformation with the proposed embossing means, the lower half of the embossing device according to the invention may comprise a channel or the like, in which the profile wire, for. B. as an endless wire, and can be performed.

An advantageous embodiment provides in this context that the channel of the lower half of the housing has at least one recess for forming at least one contact surface on the profile wire. Preferably, however, a plurality of recesses may be provided for bearing surfaces with a fit for guiding the profile wire in the channel. Further, the channel may include a clearance or the like for receiving the material displaced by the embossment. The clearance may preferably be opposite to the rolling surface to be embossed. There are also other possible arrangements of the clearance and the recesses for the contact surfaces possible.

In a further embodiment of the invention, the upper half of the housing embossing device according to the invention z. B. is aligned approximately perpendicular to the channel Having guide or the like for the die. As a result, optimum guidance of the embossing punch is achieved when it is pressed down onto the rolling surface to be embossed. The embossing stamp itself can have a raised stamp surface with an approximately rectangular basic shape. There are also other structural forms of the stamp surface conceivable.

According to one embodiment of the invention, the raised punch surface may have a predetermined slope to realize a preferred shape of the surface to be embossed or the rolling surface on the rocker pressure piece. In the case of an embossing punch having a mirror-symmetrical stamping surface for embossing two rolling surfaces, the slope may in each case have a gradient from the central mirror axis to the respective edge in only one embossing process, in which the central region is approximately 0.05 to 0.01 mm higher than the one respective edge is arranged. There are also other gradients of the gradient conceivable.

The embossing device according to the invention, in addition to the continuous feeding of an endless wire profile after embossing comprise a separating device with which a predetermined length of the embossed profile wire as a cradle z. B. is knocked off, so that the individual cradles can be collected in a receptacle. These individual cradles can then be cured together in a particularly simple manner.

Preferably, the separation of the profile wire is carried out in each case on the embossed sections. In particular, in the case of an embossing stamp having a double stamping surface, with which two embossed sections are formed during an embossing process, the separation or knocking off can take place approximately in the middle, so that an embossed section or a rolling surface is provided at one end of each stamped printing piece.

Furthermore, the present invention also proposes a rocker pressure piece of a chain-type rocker joint for a link chain, in particular for a CVT link chain. The weighing pressure piece according to the invention may be provided as a chain-type pivot joint in a recess of a tab of the plate-link chain or penetrate this recess. Two cradles form a cradle pair as chain cradles. The opposite back sides of the rocker pressure pieces of the rocker pressure piece pair form the bearing surfaces for abutment with the inner edge of the recess, wherein on the mutually facing sides of the rocker pressure pieces of the rocker pressure pair additionally rolling surfaces are provided for mutual rolling. According to the invention, at least one of these rolling surfaces of each weighing pressure piece is cambered in order to achieve the advantages described above. As a result of this proposed crowning of at least the rolling surfaces, the relative thickness between the cambered rolling surface and a contact surface of the rocker pressure piece is changed or reduced in the longitudinal direction.

Hereinafter, the present invention will be explained in more detail with reference to the drawings. Show it:

Figure 1 is a schematic view of a possible embodiment of an embossing device according to the invention for carrying out a method for producing a weighing pressure piece.

FIG. 2 shows a three-dimensional partial view of the embossing device for producing the weighing-pressure piece; FIG.

3 is an enlarged partial view of a lower half of the embossing device;

4 shows a three-dimensional view of an embossing stamp of the embossing device; and

5 is an enlarged partial view of two inventive rocker pressure pieces as Wiegedruckstückpaar in a recess of a tab of a link chain.

In Fig. 1 is a schematic view of a possible embodiment of an embossing device for producing a cradle piece of a profiled wire 2 is shown, with which the individual steps of the method also proposed for producing the cradle piece 1 are performed.

In the method according to the invention for producing a weighing pressure piece 1, a profiled wire 2 whose direction of movement is indicated by an arrow is fed to the embossing device 3 in order to be embossed by the embossing device 3 at a predetermined section 21. After the profile wire 2 has been bowed, the profile wire 2 is severed centrally at the embossed sections 21 by means of a separating device 4, so that the individual weighing pressure pieces 1 can be collected in a receptacle 22 as blanks in the form of bulk material. The separator 4 is shown in Fig. 1 only schematically two knives 23, 23 'which can be moved toward one another are indicated, the directions of movement being indicated by arrows. There are also other separation or stripping tool used.

In Fig. 2 is a detailed view of a possible embodiment of the embossing device 3 is shown. The embossing device 3 according to the invention comprises a housing with a lower housing half 5 and an upper housing half 6. The lower housing half 5 serves as a die, wherein the upper housing half 6 serves to guide an embossing stamp 7, with which the profile wire 2 is cambered for producing a rocker pressure piece 1 , The lower housing half 5 comprises a channel 8, which is approximately semicircular in the upper half of the housing 6 facing upper side of the lower housing half 5 is inserted. In the channel 8 formed as endless material profile wire 2 is received and is supplied to the die 7.

The channel 8 is shown in detail in FIG. From this view, it can be seen that the channel 8 at its lateral areas in each case opposite recesses 9, 9 ', which are provided for forming bearing surfaces 10, 10' on the rocker pressure piece 1. These contact surfaces 10, 10 'are used in the weighing pressure piece 1 to rest on an inner edge 11 of a recess 12 a tab 13 a plate chain 19. Further, the channel 8 comprises at its lower portion approximately centrally aligned a clearance 14 for receiving the in the embossing or Cambered displaced material of the profiled wire 2 to provide corresponding rolling surfaces 15 on the rocker pressure piece 1 of a Wiegedruckstückpaares to ensure a rolling of the rocker pressure pieces 1, 1 'of a Wiegedruckstückpaares on facing rolling surfaces 15, 15'.

For embossing the rolling surface 15, 15 'according to the invention of each rocker pressure piece 1, 1', the embossing device 3 has the embossing stamp 7, which is received in a guide 16 of the upper housing half 6 approximately perpendicular to the channel 8. To adjust the profile wire 2 or the embossing punch 7 in the crowning, the lower half of the housing 5 has an auxiliary channel 17 which is perpendicular to the channel 8.

FIG. 4 shows a possible embodiment of the embossing punch 7 of the embossing device 3 with a halved stamp surface 18. Since the stamp surface 18 is mirror-symmetrical, only one half of the stamp surface 18 is shown in FIG. 4. In this embodiment, the raised stamp surface 18 has an approximately rectangular basic shape. The raised punch surface 18 is formed with a slope in order to obtain the desired shape of the rolling surfaces 15, 15 'on the rocker pressure pieces 1, 1'. The gradient is like this formed so that the center is formed so the axis of symmetry relative to the respective edge about 0.05 to 0.01 mm higher than the edge. There are also other structural forms of the stamp surface 18 possible.

In Fig. 5 is a partial view of a link chain 19 with two on a Wiegedruckstückpaar consisting of rocker pressure pieces 1, 1 'hingedly connected tabs 13, 13' shown. The two rocker pressure pieces 1, 1 'of the rocker pressure piece pair are guided in a recess 12 and rest with their contact surfaces on the inner edge 11 of the recess 12. From this view, it is clear that the mutually facing sides of the rocker pressure pieces 1, 1 'roll on one another at their rolling surfaces 15, 15' in a bending of the link chain 19. To record the force curve within the tab 13 strain gauges 20, 20 'are provided.

It has been found that by the crowning of the rolling surfaces 15, 15 'of each rocker pressure piece 1, 1', a relief, in particular at the edge of a link chain 19 is made possible. The internal stresses generated in the crowning of the rolling surfaces 15, 15 'in each rocker pressure piece 1, 1' lead to an increase in the breaking strength, whereby the overall strength of a link chain 19 with the rocker pressure pieces 1, 1 'according to the invention can be increased.

LIST OF REFERENCES

'1' cradle

profile wire

embosser

Separator lower casing half upper casing half

dies

Channel, 9 'recess 0, 10' contact surface 1 inner edge 2 recess 3, 13 'tab 4 clearance 5, 15' rolling surface 6 guide 7 auxiliary channel 8 stamp face 9 plate chain 0, 20 'strain gauges 1 predetermined section

Receptacle 3, 23 'knife

Claims

claims

1. A method for producing a rocker pressure piece of a chain-weighing joint for a link chain, in particular for a CVT chain, characterized in that a profile wire (2) along at least one predetermined portion (21) is cambered in the longitudinal direction and then at this portion (21 ) is separated.

2. The method according to claim 1, characterized in that each separated profile wire (2) as a rocker pressure piece (1) with at least one cambered rolling surface (15) for rolling on a corresponding rolling surface (15 ') of a rocker pressure piece (1') is formed.

3. The method according to claim 1 or 2, characterized in that each separated profile wire (2) as a rocker pressure piece (1, 1 ') with at least one cambered contact surface (10, 10') for resting against an inner edge (11) of a recess (12 ) is formed a tab (13).

4. The method according to any one of the preceding claims, characterized in that after the separation of each cambered rocker pressure piece (1, 1 ') is cured.

5. embossing device (3) for producing a rocker pressure piece (1, V) of a chain-weighing joint of a profiled wire (2), in particular for performing the method according to one of the preceding claims, with a housing having a lower housing half (5) as a die and an upper housing half (6) for guiding at least one embossing punch (7) for crowning the profile wire (2).

6. embossing device according to claim 5, characterized in that the lower housing half (5) has a channel (8) for receiving and performing a profile wire (2).

7. embossing device according to claim 6, characterized in that the channel (8) has at least one recess (9, 9 ') for forming at least one contact surface (10, 10') on the profile wire (2).

8. embossing device according to claim 6 or 7, characterized in that the channel (8) has at least one clearance (14) for receiving the displaced during the embossing material of the profile wire (2).

9. Embossing device according to one of claims 6 to 8, characterized in that the upper housing half (6) has an approximately perpendicular to the channel (8) aligned guide (16) for the stamper (7).

10. embossing device according to one of claims 5 to 9, characterized in that the embossing punch (7) comprises a raised punch surface (18) with an approximately rechteckförmi- gene basic shape.

11. Embossing device according to claim 10, characterized in that the raised punch surface (18) has a slope.

12. Embossing device according to claim 11, characterized in that the gradient from the center to the edge is about 0.05 to 0.01 mm.

13. Embossing device according to one of claims 5, to 12, characterized in that a separating device (4) for knocking off a rocker pressure piece (1, 1 ') on the embossed portion (21) of the profile wire (2) is provided.

14. Weighing pressure piece of a chain-type swing joint for a link chain, in particular for a CVT chain, which penetrates a recess (12) of a tab (13) of the link chain (19), wherein the rear sides of the rocker pressure pieces (1, 1 ') of a rocker pressure pair facing abutment surfaces (10, 10 ') for abutment with the inner edge (11) of the recess (12) and being provided on the mutually facing sides of the rocker pressure pieces (1, 1') of a rocker pressure pair rolling surfaces (15, 15 '), characterized that at least the rolling surfaces (15, 15 ') of each rocker pressure piece (1, 1') are cambered.

15. Weighing pressure piece according to claim 15, characterized in that the relative thickness between the rolling surface (15, 15 ') and the contact surfaces (10, 10') of each rocker pressure piece (1, 1 ') is reduced.