EP2750826A1

EP2750826A1 - Method and device for inserting a bearing bush

Info

Publication number: EP2750826A1
Application number: EP12790815.0A
Authority: EP
Inventors: Wolfgang RÖMPP; Siegfried Gruhler; Joachim Klein
Original assignee: Mauser Werke Oberndorf Maschinenbau GmbH
Current assignee: Mauser Werke Oberndorf Maschinenbau GmbH
Priority date: 2011-11-02
Filing date: 2012-11-02
Publication date: 2014-07-09
Also published as: CN103906599A; BR112014010596A2; WO2013064655A4; KR20140088598A; WO2013064655A1; DE202012013324U1; MX2014004970A; CN103906599B

Abstract

The invention relates to a method and to a device for inserting a bearing bush (8) into a bearing eye (6), and to a workpiece produced according to such a method or by means of such a device. According to the invention, the bearing bush (8) is rolled into the bearing eye (6).

Description

Method and device for introducing a bearing bush

description

The invention relates to a method for introducing a bearing bush in a bearing eye according to the preamble of patent claim 1, a device for

Implementation of this method and a workpiece produced by this method and / or with this device.

From the prior art, it is known to press a bearing bush in a bearing eye, for example in a small connecting rod eye. For calibrating the bushing inner diameter calibration segments can be provided, which are arranged offset on a rod along its longitudinal axis and viewed in the pressing direction have a slightly increasing diameter.

The problem is the use of such calibration tools, for example in so-called Henkelkorbpleueln, in which the peripheral wall of the connecting rod is designed with different axial length.

In the subsequently published DE 10 201 1 001 492.6 discloses a method in which two Kalibriersegmente axially spaced are provided, said axial distance is selected so that a Kalibriersegment in contact with the peripheral region with a larger axial length and the other Kalibriersegment in contact with the peripheral region can be brought with a smaller axial length.

A disadvantage of the above-described solutions that the calibration is associated with comparatively great effort and that beyond the bushing must be made with high precision, so that they can be used on the one hand with the required interference fit in the bearing eye and on the other hand with the

Calibration tools is calibrated.

In contrast, the invention has the object, a method for introducing a bearing bush in a bearing eye, a device for carrying out the To provide method and a manufactured according to such a method or such a workpiece, which allows easy insertion of a bearing bush in a bearing eye.

This object is achieved with regard to the method by the features of claim 1, in terms of the device by the features of the independent claim 13 and by a workpiece after the sibling

Claim 20 solved.

Advantageous developments of the invention are the subject of the dependent claims.

According to the method of the invention, a bushing is first inserted into a bearing eye, this insertion can be done either with clearance or with a small interference fit, this surface compression is significantly lower than a press fit, which would be required to the bushing in operation against rotation secure in the bearing eye. In a next step, the "loose" used bearing bush is processed by plastic forming, so that their

Outer circumference with the required in the intended use press fit against a peripheral wall of the bearing eye, while the inner circumference is brought to a predetermined level. That is, unlike the conventional one

Method, the interference fit is produced by a forming step, which is carried out after inserting the bearing bush in the bearing eye. This has the

significant advantage that the bushing can be prefabricated with much lower dimensional accuracy than in the conventional method, with lower requirements than in the prior art are also made in terms of surface finish and surface coating and on the bearing bush material. As I said, the inner circumference is brought to a predetermined level, which still does not have to be the final nominal size of the bearing bush inner diameter.

In a preferred embodiment, the plastic forming by means of a rotating rolling tool, so that the bearing bush is rolled into the bearing eye. The rolling tool preferably has a plurality of circumferentially distributed rollers which are adjustably mounted in the radial direction. The security against rotation is further increased if a structuring is formed on the inner circumference of the bearing eye, as described, for example, in DE 103 25 910 B4 of the Applicant.

The roughness of this structure is preferably in the range between 3 to 10 μιτι, preferably between 5 to 7 μιτι.

The holding force can be further increased if at least one micro-recess is provided on the inner circumference of the bearing eye, in which material of the bearing bush is rolled during plastic forming.

The bearing bush can - as indicated above - be used either with play or with a relatively small interference fit.

The procedural effort is particularly low when the insertion of the bearing bush takes place by means of the rolling tool described.

The method may include the following steps. In a first step, the rolling tool dips into a bearing bush to be processed, wherein the enveloping circle diameter of the rolling tool is less than the inner diameter of the bearing bush. In a next step, the rolling tool is adjusted radially, so that the bearing bush is held on the rolling tool. In a further step then moves the rolling tool with the bearing bush held in the bearing eye. After an axial and possibly radial positioning of the bearing bush within the bearing eye, the rolling tool is radially adjusted to first produce a Reibhaftung between the bearing bush and the bearing eye and then einwalzen the bearing bush by a plastic deformation in a further radial adjustment. After rolling, the rolling tool is returned in the radial direction and moved out of the bearing eye out.

As mentioned, the bearing bush and accordingly also the bearing eye can be designed with axially longer and shorter peripheral portions. It can be advantageous, the rolling tool in the region of the shorter in the axial direction

Support peripheral sections to achieve a uniform surface pressure.

After rolling the bearing bush in the bearing eye can still one

Finishing of the bearing bush, done for example by spindling or smooth rolling.

This finishing can be done on the same processing station or an additional processing station. For this finishing, for example for unwinding a centering of the bearing eye is required. In conventional solutions, this centering was carried out by means of a precision boring machine, so that the relevant workpiece is aligned with the fine boring spindles. In a solution according to the invention, this centering takes place without an external station by means of the

Rolling tool. In the case where another bearing eye, such as a connecting rod, is present, the centering of this area over a

Centering mandrel done, which dips during the rolling process in the other bearing eye, for example, the large bearing eye of the connecting rod.

The centering can be done after rolling, for example. In the case in which the workpiece with a second bearing eye, for example in a connecting rod, the large bearing eye is executed, can then be centered in the large connecting rod

Centering be introduced with a 2-point centering, which fixes the connecting rod transversely to the connecting rod direction. For centering in the connecting rod longitudinal direction, the rolling tool is inserted into the small connecting rod eye. Since the rolling tool rests along the inner circumference, there is also a centering of the small bearing eye in the direction of the connecting rod. The 2-point centering also fixes the workpiece during rolling.

After this centering, the workpiece is clamped and processed further.

This further processing can be done in all the described embodiments on a processing station, for example an inverse machine, on the example, bushingless connecting rods and connecting rods provided with bushings in small Connecting rod eye can be edited. When machining a bushless connecting rod, smoothing / rolling in the inverse concept takes place via a multi-spindle rolling head. In the alternative processing of a connecting rod with bush, a multi-spindle rolling unit is then used instead of the multi-spindle rolling head.

In the above-described machining with a 2-point centering in the large connecting rod and in the formation of the small connecting rod as Henkelkorbpleuelauge it can happen that the narrow side of the small connecting rod eye is significantly more compressed than the axially wider side in the rolling, so that the

Socket wall thickness on the narrower side is slightly smaller than that on the wider side of the small connecting rod eye. This leads to the fact that the entire connecting rod is asymmetrical in the longitudinal direction. This asymmetry is then compensated in the above-described post-processing. To avoid this disadvantage, instead of the described two-point centering, a four-point centering can be used, by means of which the large connecting rod eye is fixed in position both in the connecting rod direction and transversely thereto. The centering of the small connecting rod eye is similar to the previous one

described solution on the rolling tool. After this centering, the workpiece is clamped and the bush rolled. Due to the 4-point centering of the large connecting rod eye, the above-described asymmetry can be avoided or at least greatly reduced, so that after rolling a uniform

Socket wall thickness is present.

The above-described 2-point or 4-point support can of course also be made in other workpieces, which are designed with a provided with a bushing bearing eye and with another, effective as a centering recess.

Among other things, the following strategies for centering and rolling are possible according to the inventive concept:

The insertion of the bearing bush and rolling is done with different tools; The insertion and rolling in by means of a tool, in

present case of the rolling tool;

Rolling and centering are carried out on a processing unit, for example an inverse machine, on which the subsequent processing, for example, the unwinding is then carried out;

If the unit is designed so that it can also be centered, a separate centering unit can be dispensed with - in the case of an inverse machine this is then designed with a multi-spindle rolling head and a centering multi-spindle head;

By a 4-point centering of another bearing eye, for example, the large connecting rod eye, the workpiece is supported, so that when

Einwalzen a uniform socket wall thickness is achievable.

The smooth rolling can be carried out by means of a tool, as described for example in DE 10 201 1 000 618 of the applicant.

The device for carrying out the method has at least one station for inserting a bearing bush into a bearing eye and for plastic deformation of the bearing bush, so that it is received in the bearing eye with a predetermined interference fit.

This insertion and reshaping can be done in a single station. In an alternative solution, the insertion of the bearing bush in the bearing eye can be done in a station of a first processing unit, which also has a break separation station. The plastic forming / rolling of the bearing bush in the bearing eye is then carried out with a further processing unit.

The centering of the workpiece to be machined can, as explained, take place via its own centering unit or else via the rolling tool itself. In addition, further centering means may be present, which dive into a further bearing eye or a corresponding recess of the workpiece in order to center the workpiece and to secure against rotation even during rolling of the bearing bush. This

Centering can be done with 2-point centering or 4-point centering be. Preferably, the Zentriernnittel is designed so that it allows centering and clamping.

The plastic forming / rolling can be carried out by means of a rotating rolling tool having a plurality of circumferentially distributed rollers which are adjustably mounted in the radial direction.

In order to avoid twisting of the bearing eye or the workpiece in which the bearing eye is formed during the forming, the device may be designed with a torque support. In a connecting rod then preferably a connecting rod is supported against rotation.

The workpiece according to the invention is preferably a connecting rod of an internal combustion engine.

The bearing bush can be made from a sheet metal blank. Since a pressing in with high pressing forces in the bearing eye is not required, the bearing bush can be made uncoated. In conventional solutions, a coating, for example a zinc layer, has been provided to prevent damage to the bearing bush during the pressing.

Conventionally, the term "bearing bush" can be understood to mean a component which is suitable for absorbing the radial and axial forces occurring in the bearing and is furthermore optimized with regard to optimum lubrication / tribology The term "bearing bush" and components are construed, which are designed only with a view to reducing friction and the optimization of lubrication properties - the absorption of forces can in such bushings - also called bearing sleeves - done by the device in which these bushings used are. That is, the "bearing bushing" is then optimized in terms of tribology - the actual bearing forces are essentially absorbed by the peripheral wall supporting the bearing bush. A preferred embodiment is explained in more detail below with reference to schematic drawings. Show it:

Figure 1 is a partial view of a connecting rod with a bearing bush according to the invention;

Figure 2 shows the bearing bush according to Figure 1 in a sectional view and a plan view;

Figure 3 shows the bearing bush of Figure 1 in its Blechabwicklung;

FIG. 4 shows a head of a rolling tool for rolling in the bearing bush according to FIGS. 2 and 3;

Figure 5 is a schematic diagram of a method with 2-point centering and

Figure 6 is a schematic diagram of a method with 4-point centering;

7a to 7e a schematic representation of the method steps during rolling of the bearing bush in the bearing eye of the connecting rod according to FIG. 1

Figure 1 shows a sectioned partial view of a connecting rod 1 of an internal combustion engine, wherein only a small connecting rod 2 and a part of a rod 4 are shown. The connecting rod 2 is designed as a Henkel basket connecting rod, in which the piston rod side peripheral portion of the connecting rod 2 is designed with a larger axial length L than the peripheral portion removed therefrom, which has an axial length I (see Figures 1 and 2). According to the sectional illustration in FIG. 1, the transition between the regions with an axial length L and I takes place continuously. In a bearing eye 6 of the small connecting rod 2, a bearing bush 8 is inserted, the contour of the

Henkelkorbgeometrie the connecting rod 2 is adjusted.

The structure of the bearing bush 8 will be explained with reference to Figures 2 and 3. Figure 2a shows a section through the bearing bush 8 and Figure 2b is a plan view of the Bushing in Figure 1. FIG. 3 shows a development of the bearing bush 8. According to the sectional view in FIG. 2a, the bearing bush 8 is likewise designed with a section of maximum axial length L and a section of minimum axial length I corresponding to the geometry of the small connecting-rod eye 2, the "axial length" being in the direction of the axis 10 of the small connecting rod 2 is indicated.

In the plan view (Figure 2b), the bearing bush 8 is cylindrical. In the illustrated embodiment, the bearing bush is rolled out of a sheet metal blank with the geometry shown in Figure 3a and then inserted into the bearing eye 6 (connecting rod bore). This insertion or pressing takes place in a variant of the invention with a comparatively low interference fit, wherein the press-fit produced at the given operating conditions is not sufficient to secure the bushing 8 sufficiently against rotation.

The development of the bearing bush 8 according to FIG. 3 shows the long region 12 of the bearing bush 8, which is designed with the larger axial length L, and the two regions 14, 16 which are designed with a small axial length I. The latter expire in each case in an end edge 18 and 20, respectively. As mentioned, the bushing 8 is made of a sheet metal blank having the thickness d (Figure 3b) and then rolled around, the two end edges 18, 20, as indicated in Figure 2, along a joint 21 (Figure 2a) are flush with each other - a welding or cohesive bonding does not take place. The sheet metal blank is preferably not provided with a protective layer, such as a zinc layer - as explained above, conventional bushings must be protected by a suitable surface finish against damage due to the large effective during pressing forces. This is not required in the bushing 8 according to the invention - of course, but this can also be used with a

Surface layer are provided or the surface to be tempered accordingly.

In one embodiment of the invention, as described above rolled round bushing 8 is inserted with a slight press fit into the small connecting rod 6 and then rolled by means of a rolling tool 22 shown in Figure 4 in the bearing eye 6. This only partially illustrated rolling tool 22 has a tool head with a stop 24, which during the rolling process on an end face portion 26 of the Pleuelauges 2 shown schematically in Figure 4 is seated and rotatably supported. An unillustrated shaft of the rolling tool 22 may be selected depending on the clamping systems of the respective processing unit. Between the

shown tool head and the shaft, not shown, there is a control and circuit for setting and limiting the effective diameter

(Envelope circle diameter) of a rolling head 28, which passes through the bearing eye 2. This rolling head 28 has a plurality of rollers 30 distributed around its circumference, which are held in position in a roller cage 32. The rollers 30 are tapered and are supported in the radial direction inside (not shown in Figure 4) on a cone located in the axis of the tool, which is in communication with the tool shank. The roller cage 32 with the rollers 30 is rotatable relative to the cone and axially displaceable by a limited amount. The rollers 30 and the cone are coordinated so that the rollers 30 form a cylindrical enveloping circle, so that the tool diameter measured over the rollers 30 over the entire length of the roller is the same. With a displacement of the roller cage 32 upwards, the rollers 30 are displaced on the axial cone, the diameter of which increases in an upward direction, so that correspondingly the enveloping circle diameter of the rolling head is increased. A spring housed in the above-mentioned circuit pushes down the roller cage 32, so that the enveloping circle diameter is minimum in the rest position of the rolling tool 22. The stop 24 can either with the plane end face portion 26 of the connecting rod 2 or even with a reference surface of a workpiece clamping device

work together.

In the first variant of the method according to the invention, the rotating rolling tool 22 is inserted into the bearing bush 8 already used. The stop 24 is adjusted so that the rolling head 28 over the entire length of the rollers 30 in the collapsed state, d. h., Is retracted at the smallest Hüllkreisdurchmesser in the connecting rod 2 when the stop 24 rests on the end face portion 26. Further displacement of the roller cage 32 in the axial direction is then no longer possible. The further

Spindle feed leads to the displacement of the cone relative to the rollers 30 and thus to an enlargement of the enveloping circle diameter. D. h., The rollers 30 are pressed against the inner circumference of the bearing bush 8, so that their transformation begins. The stop of the tool feed also increases the envelope diameter and thus the transformation of the bearing bush 2 ends. This means that the degree of deformation and thus the inner diameter of the bushing can be controlled after being rolled in by the machine feed. Preferably after the stop of the feed still some tool revolutions are performed and then the

Rolling tool 22 retracted at rapid traverse. In a first phase of the retraction, the rolling tool 22 collapses again to the smallest diameter (enveloping circle diameter minimum) and can then be pulled out of the bearing bush.

By forming compressive stresses in the circumferential direction in the

Bearing bush 8 introduced, which lead to a plastic strain in the circumferential direction. If the above shock 21 is executed without play, d. h. if the two

End edges 18, 20 are flush with each other, tangential compressive residual stresses are built up in the order of the yield strength of the bushing material. These lead to the technically maximum possible joint pressure between bush and connecting rod.

During the forming process, the entire bushing cross-section is subject to a compressive stress above the yield strength. In this state is also the

Outer diameter of the bearing bush 8 plastically deformable. The socket can assume the negative shape of the opposite surface roughness profile in the peripheral surface of the bearing eye 6 in this state. Depending on the characteristics of this profile, this can result in a micro-form fit, which significantly increases the static friction under the above-described joint pressure. By a suitable choice of the roughness profile in the

Pleuelauge there is the possibility to optimize the adhesive force or the adhesive torque.

The adhesive force can for example be increased by the fact that in the

Lagerauge predetermined structures, for example by mechanical processing (honing, spindles) or by laser energy are introduced. Another or additional possibility is to form a micro-groove or the like in the circumferential wall of the bearing eye 6.

A problem with the Henkel basket connecting rod described is that due to the different axial lengths of the bearing bushing 8, the rolling tool 22 in its entirety rests with its rollers 30 on the bearing bush 8 in some areas, while at the shorter peripheral portions of length I carries only a portion of the rollers 30. This can lead to the bushing 8 being deformed more strongly in the narrower region than in the wider region, since the surface pressure in the narrower region is correspondingly greater. If such non-uniform deformation is problematic, support elements can be provided which radially supports the rolling tool 22 or more precisely its rollers 30 in the narrower regions. This support is indicated in Figure 4 with the two arrows F.

Due to the uneven surface pressure, it may happen, as stated above, in Henkel basket connecting rods that the jack wall thickness in the narrower area I is less than the jack wall thickness in the wider area L.

These different socket wall thicknesses are shown in the illustration according to FIG. 5 with S1 and S2, in which case S2 <S1 accordingly. In a method strategy shown in Figure 5, this unbalanced configuration of the connecting rod is expected and then compensated for the subsequent processing.

Figure 5 shows a side view and a plan view of a connecting rod 1 with a large connecting rod 34 and the small connecting rod 2, in the bearing eye 6 the

Bearing bush 8 is to be rolled. The small connecting rod 2 is designed as Henkelkorb- connecting rod with a narrow side and a wider side. Before the

Rolling the bearing bush 8, a 2-point centering 36 is first introduced into the large connecting rod 34, so that this is position-centered in the X direction.

The bushing 8 is then according to one of the strategies described either via its own Einpresswerkzeug or via the rolling tool 22 in the small

Connecting rod eye 2 pressed or inserted. Depending on the strategy then the centering of the small connecting rod 2 in the X and Y direction (see coordinate system in Figure 5) by the rolling tool 22. After this centering takes place the tensioning of the connecting rod 1 and the rolling of the bearing bush 8 in the manner described above, wherein the connecting rod 1 is then supported via the 2-point centering 36 against rotation. Due to the above-described different surface pressures and the associated greater compression of the material in the region of the narrow part of the small Pleuelauges is corresponding to the wall thickness S2 smaller than the wall thickness S1 in the axial direction wider part of the small connecting rod eye.

In the subsequent processing, such as spindling or smoothing this asymmetry is then compensated, wherein prior to machining, a centering takes place in which the rolling element dips into the small bearing eye 2 and this centered in the X and Y direction, while the 2-point Centering 36 in the large bearing eye 34 determines the orientation X direction. After this centering then the further processing of the connecting rod 1.

A method is explained with reference to FIG. 6, in which the asymmetry of the connecting rod 1 or more precisely, the unequal socket wall thickness is prevented or at least reduced.

In this variant, the connecting rod 1 is first centered, in which in the large connecting rod 34, a 4-point centering 38 is inserted, which then at the

Peripheral wall of the large connecting rod eye 34 is lightly applied. Similar to the embodiment described above, after the press-fitting or insertion of the bearing bush 8, the small connecting rod eye 2 is centered by means of the rolling tool 22, which also easily on the inner peripheral wall of the not yet rolled

Bearing bush 8 is present.

For rolling, the large connecting rod eye 34 is then tensioned via the 4-point centering 38 and the bearing bush 8 is rolled over the rolling tool 22. After the rolling operation, the rolling tool 22 returns to its receiving position for receiving a new bearing bush 8 and the 4-point centering 38 is relaxed, so that the still centered connecting rod 1 can be fed to a next processing step.

In the case of an inverse machine, for example, a workpiece holder holding a plurality of connecting rods travels to the next machining tool. In separate

Machining units, the workpiece holder is moved out with the applied and centered connecting rods and guided to the next processing station. The above-described system causes with respect to the centering of the connecting rod 1 in the Y direction over-centering, which due to the exact support in Pleuellängsrichtung the bushing wall thicknesses S1 and S2 after rolling in

Essentially the same as far as possible.

The loading of the rolling unit can be done by its own loading device or, in the inverse concept via a tensioning device, which is in principle also formed by the rolling tool 22 and the 4-point centering described, wherein, as mentioned above, for receiving the unprocessed connecting rods, the rolling tool can be moved in a receiving position.

In the previously described method, the bearing bush 8 is first pressed in a station "loose" and rolled in a further station in the bearing eye 6.

In principle, however, a single station of a processing unit could be provided to perform the pressing and rolling.

As explained, the centering, rolling in and also further processing can take place on a single processing unit, for example an inverse machine, on which also busheless connecting rods can be processed. The centering is then carried out via a Zentriermehrspindel köpf, while the rolling is done for the processing of several connecting rods via a multi-spindle roller unit. This is preferably located at that position of the inverse machine to which a multi-spindle rolling head is seated in a busheless connecting rod. As mentioned, however, can also centering on its own

Centering done.

The above-described 4-point centering can be used in all embodiments described in the present application.

In an alternative variant, the rolling-in process could take place on a subsequent processing unit, for example an inverse processing unit with four spindles, so that correspondingly four connecting rods are processed simultaneously. With the above-described rolling tool 22 and such a processing unit can be in principle, also use connecting rods without bushes, in which case via the rolling tool 22, a smoothing or rolling of the small bearing eye takes place.

With reference to Figure 7, a preferred variant of the method according to the invention is explained.

In the exemplary embodiment explained with reference to FIG. 7, the bearing bush 8 is also inserted into the bearing eye 6 via the rolling tool 22. Figure 7a) shows the initial state. The bushing 8 with the inner diameter dßi and the

Outer diameter D _B i is provided in a suitable magazine. The rolling tool 22 is aligned via the control of the processing unit in the axial and radial direction to the provided bearing bush 8 and the cone retracted so far that the rollers 30 of the rolling head 28 are set to the minimum enveloping circle diameter D _W E. In a next step, the rolling tool 22 according to FIG 7b) is then moved in the Z direction until the rolling head 28 enters the bearing bush 8, wherein the enveloping circle diameter D _W E smaller than the inner diameter dßi the

Bearing bush 8 is. When immersing the rolling head 28 of the indicated stop 24 runs on a front side region of the bearing bush 8. As a result, the

Envelope circle diameter slightly increased, so that a holding diameter D _W H results, which corresponds approximately to the inner diameter dßi the bearing bush 8, so that it is held on the rolling tool 22. The rolling tool 22 is then retracted with the bearing bush 8 according to Figure 7c) in the bearing eye 6 of the small connecting rod. Of the

Outside diameter D _B i of the bearing bush 8 is chosen so that it is slightly smaller or approximately equal to the diameter D _{P of} the bearing eye 6 - the bearing bush 8 sits with play in the bearing eye 2. After the complete retraction and adjustment of

Bearing bushing 8 with respect to the connecting rod 2, the rollers 30 of the rolling head 28 are slightly extended, so that according to Figure 7d) initially an enveloping circle diameter D _W K results. In this enveloping circle diameter, the outer circumference of the bearing bush 8 is frictionally pressed against the inner peripheral surface of the bearing eye 6. Subsequently, by further enlargement of the envelope circle diameter to the final dimension D _W w

Bearing bush 8 rolled in the manner described above. As already explained above, it is advantageous if after setting the maximum enveloping circle diameter D _W w, the rolling tool 22 still performs a few turns, so that the forming process is made uniform. The bearing bush 8 is then rolled into the bearing eye 2, wherein the diameter of the bearing eye D _P then corresponds approximately to the outer diameter D _B 2 of the bearing bush 8, wherein the explained

Microforming is present and the shock 21 according to Figure 7e) is completely closed.

After this rolling, the rollers 30 are retracted again, so that the minimum enveloping circle diameter D _W E results - the rolling tool 22 or more precisely whose rolling head 28 can then be moved out of the small connecting rod eye 2 without collision.

In this variant, therefore, the insertion and rolling of the bearing bush 8 takes place at a single station of a processing unit. This can for example also be designed with a break separation station and / or a laser station.

As already mentioned, in order to avoid a relative rotation of the bearing bush 8 and bearing eye 6 during the forming process, a suitable torque support can be provided in order to avoid a rotation of the bearing bush 8.

Depending on requirements, the inner diameter of the bearing bush can then be finely machined. This finishing can be done for example by smooth rolling (rolling) or spindles.

In all embodiments, the peripheral wall of the bearing eye 6 is machined with a predetermined roughness of, for example, 5 to 7 μιτι. As mentioned, a structure by honing, spindles and / or laser structuring can also be introduced to improve the adhesion by micro-toothing.

Disclosed are a method and a device for introducing a bearing bush into a bearing eye and a workpiece, which is produced by such a method or with such a device. According to the invention, the bearing bush is rolled into the bearing eye. LIST OF REFERENCES:

1 connecting rod

2 connecting rod eye

4 pole

6 bearing eye

8 bearing bush

10 connecting rod axis

12 area L

14 Area I

16 area I

18 front edge

20 front edge

21 push

22 rolling tool 24 stop

26 end face section

28 rolling head

30 roll

32 roll cage

34 big connecting eye

36 2-point centering

38 4-point centering

Claims

claims

1 . Method for introducing a bearing bush (8) into a bearing eye (6), wherein the bearing bush (8) is inserted into the bearing eye (6) and finished, with the steps:

Inserting the bearing bush (8) in the bearing eye (2) and

plastic forming the bearing bush (8) such that the outer periphery with such a press fit on the peripheral wall of the bearing eye

(6) is applied that in the intended use of a rotation of the bearing bush (8) relative to the bearing eye (6) is prevented and a

Inner circumference (d _ß 2) of the bearing bush (8) is brought to a predetermined level.

2. The method according to claim 1, wherein the forming is carried out by rolling by means of a rotating rolling tool (22) having a plurality of circumferentially distributed rollers (30) which are adjustably mounted in the radial direction.

3. The method according to claim 1 or 2, wherein on the inner circumference of the bearing eye (6) has a structure is formed.

4. The method according to claim 3, wherein the structure has a roughness with Rz of 3 to 10 μιτι, preferably 5 to 7 μιτι.

5. The method according to any one of the preceding claims, with a micro-penetration on a peripheral surface of the bearing eye or the bearing bush.

6. The method according to any one of the preceding claims, wherein the bearing bush (8) is pressed before forming.

7. The method according to any one of claims 1 to 5, wherein the bearing bush (8) is inserted before forming with play in the bearing eye (6).

8. The method according to claim 7, wherein the bearing bush (8) by means of the rolling tool (22) is used.

9. The method according to claim 8 with the steps:

Retracting the rolling tool (22) in the bearing bush (8);

Radially adjusting the rolling tool 22, so that the bearing bush (8) is held on the rolling tool (22);

Retracting the rolling tool (22) with the bearing bush (8) in the bearing eye (6);

Radial adjustment of the rolling tool for Reibhalten and for rolling in the bearing bush (8) and

Radial resetting and moving out of the rolling tool from the bearing bush (8).

10. The method according to any one of the preceding claims, with a step for finishing the bearing bush (8).

1 1. Method according to one of the preceding claims, wherein rolling in and centering of the bearing eye (6) or the bearing bush (8) takes place in a working position by the rolling process, wherein optionally a second bearing eye centered and / or supported by means of a centering means, such as a centering mandrel and / or or being tense.

12. The method according to claim 1 1, wherein the centering means allows a 2-point centering (36) or a 4-point centering (38).

13. The method according to claim 1 1 or 12, wherein a centering of the bearing eye (6) by means of the rolling tool (22).

14. Device for carrying out the method according to one of the preceding claims, with at least one station for inserting the bearing bush (8) in a bearing eye (6) and a station for forming the bearing bush (8) such that the outer circumference press-fitted to a peripheral wall of the bearing eye (6) is applied in such a way that when used as intended twisting the

Bearing bush (8) opposite the bearing eye (6) is prevented.

15. Device according to claim 14, with a centering unit, which is preferably designed as a 2-point or 4-point centering (36, 38), the

preferably also acts as a clamping device.

16. The device according to claim 15, wherein the insertion, forming and centering takes place in a single station.

17. Device according to one of the claims 14 or 15, wherein the

Insertion of the bearing bush (8) in a station of a first processing unit which preferably also has a break separation station and with a further

Processing unit for rolling in the bearing bush (8) in the bearing eye (6).

18. Device according to one of the claims 14 to 17, with a rotating rolling tool (22) having a plurality of circumferentially distributed rollers (30) which are adjustably mounted in the radial direction.

19. Device according to one of the claims 14 to 18, with a 2-point or 4-point centering for another bearing eye or the like.

20. Workpiece produced by a method according to one of the preceding claims 1 to 12.

21. Workpiece according to claim 20, wherein the bearing bush (8) is made of a sheet metal blank.

22. Workpiece according to claim 20 or 21, wherein the bearing bush (8) is uncoated.

23. Workpiece according to claim 20, 21 or 22, wherein this is a connecting rod (1).