METHOD FOR PRODUCING A ROLLER BEARING

Abstract

A method for producing a roller bearing may include threading a cam roller onto a bearing sleeve until the cam roller abuts a first axial flange of the bearing sleeve and inserting a counter holder into the bearing sleeve until the first axial flange of the bearing sleeve abuts a stop of the counter holder. The method may also include heating the bearing sleeve and forming an opposite second axial flange via inserting a forming punch into the bearing sleeve after heating the bearing sleeve. The second axial flange may be formed such that the cam roller is held in the bearing sleeve with radial play and axial play after the bearing sleeve cools down. The method may further include removing the forming punch and the counter holder from within the bearing sleeve.

Claims

1. A method for producing a roller bearing, comprising: threading a cam roller onto a bearing sleeve until the cam roller abuts a first axial flange of the bearing sleeve; inserting a counter holder into the bearing sleeve until the first axial flange of the bearing sleeve abuts a stop of the counter holder; forming an opposite second axial flange via inserting a forming punch into the bearing sleeve after heating the bearing sleeve, wherein the second axial flange is formed such that the cam roller is held in the bearing sleeve with radial play and axial play after the bearing sleeve cools down; and removing the forming punch and the counter holder from within the bearing sleeve.

2. The method according to claim 1, further comprising securing the bearing sleeve on a bearing bolt via at least one of a thermal manner and a force fit manner.

3. The method according to claim 1, wherein the cam roller is composed of a 100Cr6 steel.

4. The method according to claim 1, wherein the bearing sleeve is composed of a non-ferrous metal.

5. A roller bearing comprising a cam roller disposed on a bearing sleeve such that the cam roller has radial play and axial play, the bearing sleeve including a first axial flange and an axially opposite second axial flange formed via inserting a forming punch into the bearing sleeve after heating the bearing sleeve.

6. The roller bearing according to claim 5, wherein the cam roller is composed of a 100Cr6 steel.

7. The roller bearing according to claim 6, wherein the bearing sleeve is composed of a non-ferrous metal.

8. A valve drive of an internal combustion engine comprising a roller bearing including a cam roller disposed within and held in a bearing sleeve such that the cam roller has radial play and axial play, the bearing sleeve including a first axial flange and an axially opposite second axial flange formed via inserting a forming punch into the bearing sleeve after heating the bearing sleeve.

9. The valve drive according to claim 8, further comprising a bearing bolt, wherein the roller bearing is secured to the bearing bolt in at least one of a thermal manner and a force fit manner.

10. The valve drive according to claim 8, wherein the bearing sleeve includes a collar disposed on a radially outside of the bearing sleeve at a longitudinal end region, the collar defining the first axial flange.

11. The valve drive according to claim 9, wherein the bearing sleeve is secured to the bearing bolt in a rotatably fixed manner.

12. The method according to claim 1, wherein threading the cam roller onto the bearing sleeve includes guiding the bearing sleeve through a bearing opening of the cam roller.

13. The method according to claim 1, wherein forming the second axial flange via inserting the forming punch includes inserting the forming into an axial side of the bearing sleeve opposite the counter holder.

14. The method according to claim 2, wherein securing the bearing sleeve on the bearing bolt via at least one of a thermal manner and a force fit manner includes: at least one of heating the bearing sleeve and cooling down the bearing bolt; threading the bearing sleeve onto the bearing bolt; and at least one of cooling the bearing sleeve and heating the bearing bolt.

15. The method according to claim 2, wherein securing the bearing sleeve on the bearing bolt via at least one of a thermal manner and a force fit manner includes securing the bearing sleeve on the bearing bolt in a rotatably fixed manner.

16. The method according to claim 2, wherein the cam roller is composed of a 100Cr6 steel.

17. The method according to claim 16, wherein the bearing sleeve is composed of a non-ferrous metal.

18. The roller bearing according to claim 5, wherein the bearing sleeve includes a collar disposed on a radially outside of the bearing sleeve at a longitudinal end region, the collar defining the first axial flange.

19. The roller bearing according to claim 5, wherein the bearing sleeve is secured to a bearing bolt via at least one of a thermal connection and a force fit connection.

20. The roller bearing according to claim 19, wherein the bearing sleeve is secured to the bearing bolt in a rotatably fixed manner.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In each case schematically

[0016] FIGS. 1A, 1B, 1C, and 1D show different method steps for producing a roller bearing according to the invention and a valve drive according to the invention,

[0017] FIG. 2 shows a detailed illustration of FIG. 1D,

[0018] FIG. 3 shows an axial view onto FIG. 2.

DETAILED DESCRIPTION

[0019] According to FIG. 1, a method for producing a roller bearing 1 is illustrated, wherein a cam roller 2 and a bearing sleeve 3 comprising a first axial flange 4 are provided in a first method step. The cam roller 2 is thereby in particular made of a roller bearing steel, for example a 100Cr6 steel. The bearing sleeve 3 is made of a non-ferrous metal, for example of copper, cadmium, lead, nickel, tin, zinc or an alloy thereof. According to FIG. 1A, the cam roller 2 is thereby threaded onto the bearing sleeve 3, until it abuts on the first axial flange 4. According to FIG. 1B, a counter holder 5 is inserted into the bearing sleeve 3, until it abuts with its first axial flange 4 on a stop 6 of the counter holder 5. Beforehand, simultaneously or subsequently, the bearing sleeve 3 can be heated, so as to facilitate the forming thereof. An insertion of a forming punch 7 into the in particular heated-up bearing sleeve 3, occurs subsequently, as it is illustrated according to FIG. 1C. By compressing the forming punch 7 and the counter holder 5, the edge section, which initially still sticks out in the axial direction, is formed radially to the outside into a second axial flange 8. The forming of the bearing sleeve 3 or of the second axial flange 8, respectively, thereby occurs in such a way that the cam roller 2 is held in the bearing sleeve 3 with radial play 9 (see FIG. 2) and with axial play 10. Upon conclusion of the forming, the forming punch 7 and the counter holder 5 are pulled out of the bearing sleeve 3. The roller bearing 1 has thus been completed and is ready for a mounting on a bearing bolt 11 of a valve drive 12 of an internal combustion engine 13 (see FIGS. 1D and 2).

[0020] A securing of the roller bearing 1 on the bearing bolt 11 thereby preferably takes place by means of thermal joining, for the purpose of which the bearing bolt 11 is cooled down and/or the roller bearing 1 is heated. After threading the roller bearing 1 onto the bearing bolt 11, a temperature compensation occurs, which effects a shrinking of the bearing sleeve 3 on the bearing bolt 11 and thus secures said bearing sleeve on the bearing bolt 11 in a rotatably fixed manner The cam roller 2 is thus support so as to be rotatable with respect to the bearing sleeve 3 via the axial play 10 and the radial play 9, but is simultaneously secured by them or by their two axial flanges 4, 8, respectively, in the axial direction 14.

[0021] On its axial front sides, the cam roller 2 shown according to FIGS. 1 and 2 thereby in each case has an annular step 15, with which the respectively corresponding axial flange 4, 8 engages so as to be at least virtually surface-aligned. An additional axial space requirement, as it was required for example in the case of the snap rings, which are currently used for the axial securing, is thus eliminated.

[0022] It is a further large advantage that the bearing bolt 11 per se no longer has to be made of a slide bearing material or has to be coated with such a slide bearing material at least area by area, as a result of the slide bearing of the cam follower, that is, of the cam roller 2 on the bearing sleeve 3. This provides for a significantly more cost-efficient production of the bearing bolt 11. As a result of the elimination of the snap rings, the variety of parts and thus also the storage and logistics costs, as well as the mounting costs, can be reduced. Even a disassembly of the roller bearing 1 from the bearing bolt 11 is possible comparatively easily as a result of a corresponding temperature treatment, and in particular also without damages, as had been unavoidable with the use of traditional snap rings for the axial securing. A replacement of a possibly defective roller bearing 1 is also possible comparatively easily in the case of a thermal joint seat as a result of a corresponding temperature treatment, because the non-positive connection between the bearing sleeve 3 and the bearing bolt 11 can be eliminated by cooling down the bearing bolt 11 or by heating the bearing sleeve 3, respectively. It goes without saying that, in the alternative, a connection between the bearing sleeve 3 and the bearing bolt 11 by means of a substance-to-substance bond is also conceivable, as well as other connecting options, provided that a rotationally fixed and axially tight securing of the bearing sleeve 3 can be ensured on the bearing bolt 11.