Method for producing a bearing outer ring, bearing outer ring and rolling bearing

Abstract

The present invention relates to a method for producing a bearing outer ring (1) for a rolling bearing (2) for a motor vehicle. The method comprises: - forming a blank (3) to form a round bowl (4) with a flange (5), - creating a central clearance (6) in a bowl bottom (7) of the bowl (4), - forming the cup base (7) onto an inner side of a cup side wall (8) of the cup (4) to produce a bearing outer wall (9), and - Inserting a raceway (10) for rolling elements (11) of the rolling bearing (2) onto an inner side of the bearing outer wall (9). Furthermore, the invention relates to a bearing outer ring (1) for a rolling bearing (2) for a motor vehicle and a rolling bearing (2) for a motor vehicle.

Description

The present invention relates to a method for producing an outer bearing ring for a rolling bearing for a motor vehicle. The invention further relates to a bearing outer ring for a rolling bearing for a motor vehicle and to a rolling bearing for a motor vehicle.Rolling bearings for motor vehicles are known in which an outer bearing ring is held on a bearing seat via an additional component, such as a threaded ring, a snap ring, an adjusting screw, a clamping disk or the like. It is also known to integrate a flange into a bearing outer ring in order to be able to fix it to the bearing seat better. In this case, the bearing outer ring with flange as a turned part was produced from a blank.From document EP 2 336 589 A1 a rolling bearing is known in which an outer bearing ring is held via a formed metal sheet on a flange for fixing the rolling bearing on a bearing seat. The document DE 10 2012 216 435 A1 discloses a rolling bearing arrangement in which a rolling bearing is axially secured via a formed metal sheet which is fixed directly to a housing. A tapered ball bearing, in which an outer bearing ring is held via a housing ring, is known from the document DE 10 2005 008 007 A1.Known rolling bearings have the disadvantage that the production is very complicated and cost-intensive. Machining production methods have a high material loss and relatively long process times. Moreover, the installation of rolling bearings, in which the bearing outer ring is secured by additional securing components, is particularly time-consuming and requires the availability of a multiplicity of components.It is therefore the object of the present invention to eliminate or at least partially eliminate the above-described disadvantages in a rolling bearing. In particular, it is the object of the present invention to provide a method for producing an outer bearing ring for a rolling bearing for a motor vehicle, an outer bearing ring for a rolling bearing for a motor vehicle and a rolling bearing for a motor vehicle, which reduce material outlay and / or have improved assembly in a simple and cost-effective manner.The above object is achieved by the claims. Accordingly, the object is achieved by a method for producing an outer bearing ring for a rolling bearing for a motor vehicle having the features of independent claim 1, a outer bearing ring for a rolling bearing for a motor vehicle having the features of subordinate claim 7 and by a rolling bearing for a motor vehicle having the features of subordinate claim 10. Further features and details of the invention are evident from the dependent claims, the description and the drawings. Features and details which are described in connection with the method according to the invention naturally also apply in connection with the bearing outer ring according to the invention and the rolling bearing according to the invention and vice versa, so that with regard to the disclosure reference is or can always be made reciprocally to the individual aspects of the invention.According to a first aspect of the invention, the object is achieved by a method for producing an outer bearing ring for a rolling bearing for a motor vehicle. The method comprises:forming a blank to form a round cup with a flange,creating a central clearance in a cup bottom of the cup,forming the cup base onto an inner side of a cup side wall of the cup to produce an outer bearing wall, andintroducing a raceway for rolling bodies of the rolling bearing onto an inner side of the bearing outer wall.First, a blank is provided. The blank is preferably formed from a material which can be formed mechanically well, such as metal, sheet metal or the like. Further preferably, the blank is formed from a hardenable material in which a raceway with as little wear as possible can be produced. Preferably, the blank has a circular or square base. A width and a length of the blank are preferably many times greater than a thickness of the blank. By means of the forming process, a round cup is produced in the blank, preferably centrally. A round cup is understood within the scope of the invention to mean a depression with a round cup bottom and an annular cup side wall. On an upper side, the cup is open.The cup is formed by the forming of the blank in such a way that the flange is formed on the upper side of the cup. The flange is preferably designed in the form of an annular disk. More preferably, the flange extends in the radial direction, preferably at right angles to the cup side wall. Thus, the flange and the cup sidewall are monolithically formed with each other.The central clearance is produced in the cup bottom. Preferably, the central clearance is round. Further preferably, the central clearance is produced coaxially with the cup base. The central clearance can be produced, for example, by drilling, milling, cutting, sawing or the like. The central clearance is designed as a through-opening, so that the cup is opened outwards via the cup base by the central clearance. According to the invention, the central clearance can be produced before or after the production of the cup.The cup base is then shaped in such a way that the cup base covers the inner side of the cup side wall or at least partially covers it. Thus, the bearing outer wall is formed from the cup base and the cup side wall. The bearing outer wall is preferably annular or hollow cylindrical. The cup base preferably forms an inner ring and the cup side wall an outer ring. The bearing outer wall is therefore preferably formed in two layers from the inner ring and the outer ring. On a side facing away from the flange, the outer ring is formed monolithically with the inner ring.Finally, the raceway for the rolling bodies of the rolling bearing is introduced onto the inner side of the bearing outer wall, for example by means of pressing, milling, turning or the like. In this frame, it can be provided that the raceway is additionally treated, such as hardened, coated or the like, in order to reduce wear of the raceway. The raceway is preferably introduced into the bearing outer wall in such a way that the raceway is formed only on the inner side of the inner ring and no change of the outer ring is effected.A method according to the invention for producing an outer bearing ring for a rolling bearing for a motor vehicle has the advantage over conventional methods that an outer bearing ring can be produced with simple means and in a cost-effective manner, which outer bearing ring has a flange and a raceway for rolling bodies. A complicated machining of the flange is not necessary, so that material outlay or material loss is significantly reduced compared to conventional methods. Moreover, the bearing outer ring can be produced particularly quickly and suitable for mass production using the method according to the invention.According to a preferred development of the invention, it can be provided in a method that the forming of the blank to form the round cup with the flange is effected by deep drawing and / or the creation of the central clearance in the cup base is effected by punching. For the deep-drawing, a corresponding deep-drawing tool with a die, a deep-drawing punch and a hold-down device is used. The holding-down device is designed to hold the flange against a bearing surface of the blank, while the deep-drawing punch is designed to press a central region of the blank into the die and thus to form the cup. For punching, a corresponding punching tool with a punch and a die is used. A hold-down device can likewise be provided. The punch is configured to be moved into the die and thus to punch the central blank into the blank. Preferably, the forming is effected by deep drawing and the creation of the central clearance is effected by punching. This has the advantage that the bearing outer ring can be produced with simple means and in a cost-effective manner. In addition, these process variants are particularly suitable for automated mass production.It is preferred according to the invention that the blank is provided together with a plurality of blanks in a sheet metal strip. The sheet metal strip thus has a plurality of regions, each of which corresponds to a blank. The regions for the blanks are preferably arranged in a row next to one another. More preferably, the regions may be arranged in multiple rows side by side. In this way, the individual working actions can be more efficiently parallelized and clocked. First, the sheet metal strip is provided and fed to a forming device for forming the round cup with flange. In this case, for example, an outer contour of the flange can already be produced or at least predominantly produced. Preferably, the flange is further connected to the sheet metal strip, so that the latter can be conveyed further with the sheet metal strip. By continuing the feeding of the sheet metal strip, the region with the cup is movable to the device for generating the central clearance and an adjacent region is movable to the forming device. During the production of the central clearance, the cup can be produced in the adjacent region. Preferably, the finished bearing outer ring is separated from the sheet metal strip after the introduction of the raceway. This has the advantage that the production of the bearing outer ring is improved with simple means and in a cost-effective manner. Such sheet metal strips are particularly advantageous for automated mass production.Further preferably, the forming of the cup base takes place in such a way that an inner side of the cup base faces the inner side of the cup side wall. Preferably, the cup base is pressed together with the cup side wall. Moreover, it is preferred that the entire inner side of the cup bottom faces the inner side of the cup side wall. In this case, the entire inner side of the cup base extends at least over a subsection, in particular over a predominant subsection, of the cup side wall or over the entire cup side wall. Alternatively, the inner side of the cup bottom faces the entire inner side of the cup side wall. In this case, the entire inner side of the cup base extends over the entire cup side wall and beyond it. A free end face of the cup base is then preferably formed towards the flange. In order to achieve a flange surface which is as smooth as possible and extends in the radial direction and faces away from the bearing outer wall, a recess is preferably produced beforehand in the flange for receiving the material of the free end side of the bearing outer wall. This has the advantage that a bearing outer wall can be produced with simple means and in a cost-effective manner, which outer wall has a double wall thickness compared to the flange and a sufficient load-bearing force for the rolling bodies.In a particularly preferred embodiment of the invention, it can be provided in a method that the forming of the cup base is carried out in such a way that a clearance edge of the central clearance faces a flange inner edge of the flange. A release edge is understood to mean an edge which arises around the central release when the central release is produced. This preferably relates to the clearance edge which is formed between the inner side of the cup base and the central clearance. Particularly preferably, the clearing edge is placed against the flange in such a way that only one parting line is formed between the clearing edge and the flange. This has the advantage that a particularly compact and robust bearing outer ring can be produced with simple means and in a cost-effective manner.The raceway is preferably introduced by grinding the inner side of the bearing outer wall. For this purpose, a conventional grinding tool is preferably used for producing a raceway for rolling bearings. A material thickness of the blank is preferably selected such that during grinding only the inner side of the inner ring, i.e. of the part of the bearing outer wall which is formed from the cup base, is machined. A track free of parting lines is thus produced. This has the advantage that a particularly low-friction and low-wear raceway can be produced with simple means and in a cost-effective manner.According to a second aspect of the invention, the object is achieved by an outer bearing ring for a rolling bearing for a motor vehicle. The bearing outer ring has a flange extending in the radial direction, a bearing outer wall connected to the flange and extending in the axial direction, and a raceway, arranged on an inner side of the bearing outer wall, for rolling bodies of the rolling bearing. According to the invention, the bearing outer wall has an outer ring and an inner ring, wherein the outer ring is formed monolithically with the inner ring on a side facing away from the flange, wherein the outer ring is formed monolithically with the flange and wherein a free end side of the inner ring is arranged adjacent to the flange.The bearing outer ring is preferably made of a formable material, such as metal. According to the invention, the material has the suitability for an outer bearing ring for a rolling bearing for a motor vehicle. The flange is formed monolithically with the bearing outer wall. Thus, the flange is monolithically formed with the outer ring and the inner ring of the bearing outer wall, the outer ring being arranged between the flange and the inner ring. The outer ring preferably completely surrounds the inner ring. The raceway is arranged on the inner side of the bearing outer ring. Preferably, the raceway is arranged on a side of the inner ring facing away from the outer ring. The free end face of the inner ring is arranged adjacent to the flange, for example in the radial direction next to the flange or in a recess of the flange.The bearing outer ring according to the invention has all the advantages which have already been described with respect to a method for producing a bearing outer ring for a rolling bearing for a motor vehicle according to the first aspect of the invention. Accordingly, the bearing outer ring according to the invention has the advantage over conventional bearing outer rings that a bearing outer ring is provided with simple means and in a cost-effective manner, which bearing outer ring has a flange and a raceway for rolling bodies. A complicated machining of the flange is not necessary, so that material outlay or material loss is significantly reduced compared to conventional bearing outer rings. Moreover, the bearing outer ring can be produced particularly quickly and in a mass-production-compatible manner.According to a preferred embodiment of the invention, it can be provided in the case of an outer bearing ring that a parting line is formed between the free end face of the inner ring and the flange. Further preferably, a parting line is formed between the inner ring and the outer ring, such that an inner surface of the outer ring contacts an outer surface of the inner ring or is arranged directly adjacent thereto. This has the advantage that the bearing outer ring can be produced by forming a cup previously formed from a blank using simple means and in a cost-effective manner.Particularly preferably, the bearing outer ring is produced by a method according to the invention according to the first aspect of the invention. This has the advantage that a bearing outer ring is provided with simple means and in a cost-effective manner, which bearing outer ring has a flange and a raceway for rolling bodies. A complicated machining of the flange is not necessary, so that material outlay or material loss is significantly reduced compared to conventional bearing outer rings. Moreover, the bearing outer ring can be produced particularly quickly and in a mass-production-compatible manner.According to a third aspect of the invention, the object is achieved by a rolling bearing for a motor vehicle. The rolling bearing has a bearing inner ring with a raceway, a bearing outer ring surrounding the bearing inner ring with a raceway and a plurality of rolling bodies arranged on the raceways. According to the invention, the bearing outer ring is designed as a bearing outer ring according to the second aspect of the invention.The rolling bodies are preferably held in a rolling body cage or the like. The bearing outer ring surrounds the bearing inner ring in such a way that the raceway of the bearing outer ring and the raceway of the bearing inner ring face one another and form a rolling space for the rolling bodies. The rolling bodies are arranged in the rolling space and roll off in each case on the two raceways, with the result that a relative rotation between the bearing outer ring and the bearing inner ring is ensured. Via the flange of the bearing outer ring, the rolling bearing can be arranged on a bearing receptacle and can be secured against falling out of the bearing receptacle.In the rolling bearing according to the invention, all advantages result which have already been described with respect to a method for producing an outer bearing ring for a rolling bearing for a motor vehicle according to the first aspect of the invention and with respect to an outer bearing ring for a rolling bearing for a motor vehicle according to the second aspect of the invention. Accordingly, the rolling bearing according to the invention has the advantage over conventional rolling bearings that an outer bearing ring is provided with simple means and in a cost-effective manner, which outer bearing ring has a flange and a raceway for rolling bodies. A complicated machining of the flange is not necessary, so that material outlay or material loss is significantly reduced compared to conventional bearing outer rings. Moreover, the bearing outer ring can be produced particularly quickly and in a mass-production-compatible manner.A method according to the invention for producing an outer bearing ring for a rolling bearing for a motor vehicle, an outer bearing ring according to the invention for a rolling bearing for a motor vehicle and a rolling bearing according to the invention for a motor vehicle are explained in more detail below with reference to drawings. They show in each case schematically: FIG. 1 shows a perspective view of a first point in time during the execution of a preferred embodiment of the method according to the invention, FIG. 2 shows a perspective view of a second point in time during the execution of a preferred embodiment of the method according to the invention, FIG. 3 is a perspective view of a third point in time during the execution of a preferred embodiment of the method according to the invention, FIG. 4 is a perspective view of an outer bearing ring according to a preferred embodiment of the invention, FIG. 5 is a perspective view of a rolling bearing according to a preferred embodiment of the invention, FIG. 6 shows a plan view of a preferred first embodiment of a blank according to the invention during the execution of a preferred embodiment of the method according to the invention, FIG. 7 shows a perspective view of a preferred second embodiment of a blank according to the invention during the execution of a preferred embodiment of the method according to the invention, and FIG. 8 shows a flow chart of a preferred embodiment of a method according to the invention.Elements with the same function and mode of operation are provided with the same reference numerals in each of FIGS. 1 to 8.FIG. 1 schematically shows a first point in time during the execution of a preferred embodiment of the method according to the invention in a perspective view. At the first time, a blank 3 (cf. FIG. 6 ) is shaped in such a way that a cup 4 is formed with an annular cup side wall 8 and a cup base 7. An opening of the cup 4 is surrounded by an annular flange 5. The flange 5 is formed monolithically with the cup side wall 8 and the cup base 7, wherein the cup side wall 8 is arranged between the flange 5 and the cup base 7.FIG. 2 shows a second point in time during the execution of a preferred embodiment of the method according to the invention schematically in a perspective view. At the second time, a central clearance 6 designed as a feedthrough is arranged in the cup bottom 7. An upper edge of the central clearance 6 is referred to as a clearance edge 13.FIG. 3 schematically shows a third point in time during the execution of a preferred embodiment of the method according to the invention in a perspective view. At the third time, the cup base 7 is shaped in such a way that a free end face 17 of the cup base 7 is arranged adjacent to the flange 5. The clearance edge 13 is thus arranged adjacent to a flange inner edge 14 of the flange 5. A parting line 18 is formed between the clearing edge 13 and the flange inner edge 14. The cup base 7 forms an inner ring 16 of the bearing outer ring 1. The cup side wall 8 forms an outer ring 15 of the bearing outer ring 1. The outer ring 15 and the inner ring 16 together form a bearing outer wall 9.FIG. 4 shows a bearing outer ring 1 according to a preferred embodiment of the invention schematically in a perspective view. The bearing outer ring 1 differs from the illustration from FIG. 3 in a raceway 10 which is ground into an inner side of the inner ring 16.FIG. 5 schematically shows a rolling bearing 2 according to a preferred embodiment of the invention in a perspective view. The rolling bearing 2 has an outer bearing ring 1 according to the invention with a raceway 10, in which an inner bearing ring 19 with a raceway 10 is arranged. A plurality of rolling bodies 11 are arranged on the raceways 10.FIG. 6 shows a preferred first embodiment of a blank 3 according to the invention during the execution of a preferred embodiment of the method according to the invention schematically in a plan view. The blank 3 is arranged with a plurality of blanks 3 in a single row on a sheet metal strip 12. The blanks 3 are processed stepwise in this view from left to right to produce an outer bearing ring 1 according to the invention.FIG. 7 shows a preferred second embodiment of a blank 3 according to the invention during the execution of a preferred embodiment of the method according to the invention schematically in a perspective view. The blank 3 is arranged with a plurality of blanks 3 in four rows on a sheet metal strip 12. The blanks 3 are processed stepwise in this view from left to right to produce an outer bearing ring 1 according to the invention.FIG. 8 schematically shows a preferred embodiment of a method according to the invention in a flow chart. In a first method action 100, a blank 3 is shaped, for example by deep drawing, in such a way that a round cup 4 with a flange 5 is formed. The flange 5 surrounds the cup 4 over the entire circumference, for example. In a second process action 200, a central clearance 6 is produced in a cup base 7 of the cup 4, for example by punching. The central clearance 6 is preferably formed coaxially with the cup base 7. The central clearance 6 is preferably round.In a third process action 300, the cup base 7 is formed onto an inner side of a cup side wall 8 of the cup 4. An inner side of the cup base 7 is thus arranged on an inner side of the cup side wall 8. In this way, a bearing outer wall 9 is produced by the cup base 7 and the cup side wall 8. In a fourth method action 400, a raceway 10 for rolling bodies 11 of the rolling bearing 2 is introduced onto an inner side of the bearing outer wall 9, for example by grinding.List of reference characters1 Bearing outer ring 2 Rolling bearing 3 Blank 4 Cup 5 Flange 6 Central clearance 7 Cup base 8 Cup side wall 9 Bearing outer wall 10 Raceway 11 Rolling bodies 12 Sheet metal strips 13 Clearance edge 14 Flange inner edge 15 Outer ring 16 Inner ring 17 Free end face 18 Parting line 19 Bearing inner ring 100 First method action 200 Second method action 300 Third method action 400 Fourth method actionReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedEP 2 336 589 A1

[0003] DE 10 2012 216 435 A1

[0003] DE 10 2005 008 007 A1

[0003]

Claims

Method for producing an outer bearing ring (1) for a rolling bearing (2) for a motor vehicle, comprising: - forming a blank (3) to form a round cup (4) with a flange (5), - producing a central clearance (6) in a cup base (7) of the cup (4), - forming the cup base (7) onto an inner side of a cup side wall (8) of the cup (4) to produce an outer bearing wall (9), and - introducing a raceway (10) for rolling bodies (11) of the rolling bearing (2) onto an inner side of the outer bearing wall (9).Method according to claim 1, characterised in that the forming of the blank (3) to form the round cup (4) with the flange (5) is effected by deep drawing and / or the creation of the central clearance (6) in the cup base (7) is effected by punching.Method according to Claim 1 or 2, characterized in that the blank (3) is provided together with a plurality of blanks (3) in a sheet metal strip (12).Method according to one of the preceding claims, characterized in that the forming of the cup base (7) is carried out in such a way that an inner side of the cup base (7) faces the inner side of the cup side wall (8).Method according to one of the preceding claims, characterized in that the forming of the cup base (7) is carried out in such a way that a clearance edge (13) of the central clearance (6) faces a flange inner edge (14) of the flange (5).Method according to one of the preceding claims, characterized in that the raceway (10) is introduced by grinding the inner side of the bearing outer wall (9).Bearing outer ring (1) for a rolling bearing (2) for a motor vehicle, having a flange (5) extending in the radial direction, a bearing outer wall (9) which is connected to the flange (5) and extends in the axial direction, and a raceway (10), which is arranged on an inner side of the bearing outer wall (9), for rolling bodies (11) of the rolling bearing (2), characterized in that the bearing outer wall (9) has an outer ring (15) and an inner ring (16), wherein the outer ring (15) is formed monolithically with the inner ring (16) on a side facing away from the flange (5), wherein the outer ring (15) is formed monolithically with the flange (5) and wherein a free end side (17) of the inner ring (16) is arranged adjacent to the flange (5).Bearing outer ring (1) according to Claim 7, characterized in that a parting line (18) is formed between the free end face (17) of the inner ring (16) and the flange (5).Bearing outer ring (1) according to Claim 7 or 8, characterized in that the bearing outer ring (1) is produced by a method according to one of Claims 1 to 6.Rolling bearing (2) for a motor vehicle, having a bearing inner ring (19) with a raceway (10), a bearing outer ring (1) surrounding the bearing inner ring (19) with a raceway (10) and a plurality of rolling bodies (11) arranged on the raceways (10), characterized in that the bearing outer ring (1) is designed as a bearing outer ring (1) according to one of Claims 7 to 9.

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