HONING TOOL AND METHOD FOR MACHINING A BEARING PART

Abstract

A honing tool includes a honing stone holder and a branching lubricant duct arranged in the honing stone holder. The branching lubricant duct has a straight section, first and second diagonal sections connected to and positioned diagonally to the straight section, and first and second transition sections that adjoin the first and second diagonal sections, respectively, and are arranged in a first plane parallel to and spaced from the straight section. The duct also has first and second open end sections continuing from the first and second transition sections, respectively, and directed towards a second plane arranged parallel to the first plane and in which the straight section is situated. In an example embodiment, the honing tool includes a honing stone fixed in the honing stone holder between the first and second transition sections.

Claims

1-8. (canceled)

9. A honing tool comprising: a honing stone holder; and a branching lubricant duct arranged in the honing stone holder, the branching lubricant duct comprising: a straight section; a first diagonal section connected to and positioned diagonally to the straight section; a second diagonal section connected to and positioned diagonally to the straight section; a first transition section that adjoins the first diagonal section and is arranged in a first plane parallel to and spaced from the straight section; a second transition section that adjoins the second diagonal section and is arranged in the first plane; a first open end section continuing from the first transition section and directed towards a second plane arranged parallel to the first plane and in which the straight section is situated; and a second open end section continuing from the second transition section and directed towards the second plane.

10. The honing tool of claim 9, further comprising a honing stone fixed in the honing stone holder between the first transition section and the second transition section.

11. The honing tool of claim 10, wherein: the honing stone comprises a longitudinal direction; and the first open end section and the second open end section are oriented in the longitudinal direction.

12. The honing tool of claim 9, wherein: the straight section is longer than all other sections of the branching lubricant duct; and the first open end section and the second open end section are shorter than all other sections of the branching lubricant duct.

13. The honing tool of claim 9, wherein: the branching lubricant duct further comprises a transverse section oriented orthogonally to the straight section; and each of the first diagonal section and the second diagonal section is connected to the straight section via the transverse section.

14. The honing tool of claim 13, wherein each of the transverse section, the first diagonal section and the second diagonal section is closed on one side by a respective screw.

15. A method for machining a bearing part comprising: providing the bearing part comprising a first raceway and a second raceway for rolling elements; providing a honing tool formed from a cranked holder and a honing stone fixed therein, wherein: the cranked holder comprises: a shaft; a longitudinal direction extending along the shaft; and a branching lubricant duct with outlet openings arranged next to the honing stone; the honing stone is designed as an elongate cuboid that forms a right angle with the longitudinal direction; and machining the first raceway with the honing tool, wherein a cooling lubricant is passed through the branching lubricant duct and directed in the longitudinal direction onto the first raceway; and machining the second raceway with the honing tool, wherein the cooling lubricant is passed through the branching lubricant duct and directed in the longitudinal direction onto the second raceway.

16. The method of claim 15 wherein the bearing part is for a wheel bearing.

17. The method of claim 15 wherein the bearing part is an outer ring for a wheel bearing.

18. The method of claim 15, wherein: during the machining of the first raceway with the honing tool, the honing tool engages in the bearing part from a first end face; and during the machining of the second raceway with the honing tool, the honing tool engages in the bearing part from the first end face.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the following, an exemplary embodiment of the disclosure is explained in more detail by means of a drawing. In the figures:

[0022] FIG. 1 shows a honing stone holder of a honing tool in a perspective view,

[0023] FIG. 2 shows the honing stone holder in a sectional view,

[0024] FIG. 3 shows the machining of a wheel bearing outer ring with the honing tool in a first machining phase, and

[0025] FIG. 4 shows the machining of the wheel bearing outer ring by the honing tool in a second machining phase.

DETAILED DESCRIPTION

[0026] A honing tool, identified as a whole by reference sign 3, is provided for machining a workpiece 2, namely the wheel bearing outer ring. The arrangement sketched in FIGS. 3 and 4, which comprises the workpiece 2, i.e., the wheel bearing part, and the honing tool 3, is referred to as a whole as a machining arrangement 1. In FIG. 3, a pressure roller 6 can also be seen, which absorbs radial forces.

[0027] The workpiece 2 to be machined has a flange 4 which, when the wheel bearing is installed, is connected to a wheel carrier. Bores in the flange 4 are denoted by 5. The flange 4 is connected in one piece to a cylindrical section 12 in which a first raceway 10 and a second raceway 11 are formed, which are to be machined with the honing tool 3. In the finished state of the wheel bearing, balls roll as rolling elements on the raceways 10, 11 in a manner known per se. Overall, the wheel bearing, which comprises the wheel bearing part 2, is designed as a double-row angular contact roller bearing in an O-arrangement. With regard to the basic construction of such a wheel bearing, reference is made to the prior art cited at the outset.

[0028] The honing tool 3 comprises a honing stone holder 7, shown in isolation in FIGS. 1 and 2, which is also referred to as a holder for short. When using the honing tool 3, a honing stone 8 is fixed in the holder 7 with the aid of a pressure block 9. The honing stone holder 7 is traversed by a duct, denoted as a whole by 16, partially split into two arms, i.e., a lubricant duct, which will be discussed in more detail below.

[0029] A cooling lubricant 13, which is also referred to as lubricant for short and is used for honing, is passed through the duct 16. The lubricant 13 is introduced through a connection piece 18 into a straight, long section 17 of the duct 16. The first, straight section 17 of the duct 16 runs through a shaft 15 of the honing stone holder 7. At its end opposite the connection piece 18, the shaft 15 merges into a widened section 19. In this widened section 19 there is a transverse duct 20 which adjoins the first section 17 and is also assigned to the duct 16. The two ends of the transverse duct 20 are connected to diagonal ducts 23, 24, which are located in an intermediate section 22 which bends obliquely from the area of the holder 7 formed from the shaft 15 and the widened section 19 connected thereto.

[0030] The transverse duct 20, which is also referred to as a transverse section, is designed as a blind hole closed by a screw 21 on a side surface of the holder 7. In a corresponding manner, the two diagonal ducts 23, 24, i.e., diagonally positioned sections of the lubricant duct 16, are closed by screws 25, 26.

[0031] The diagonally positioned sections 23, 24 each merge into a straight, short section 27, 28 shortly before the screws 25, 26. The two straight, short sections 27, 28 are also referred to as transition sections and define a plane which is arranged parallel to a plane in which the first, straight section 17 of the duct 16 is situated. Each of the short sections 27, 28 is closed by a screw 29, 30 which—based on the arrangement according to FIG. 1—is arranged on the underside of the honing stone holder 7.

[0032] Above the screws 29, 30, one end section 31, 32 branches off at right angles from the straight, short sections 27, 28. The cooling lubricant 13 emerges from the end sections 31, 32 in such a way that it is fed to the machining area along the honing stone 8. The two machining areas, which are in the form of the raceways 10, 11, are separated from one another by a central inner wall area 14. Due to the cranked shape of the honing stone holder 7 including the lubricant duct 16, each raceway 10, 11 can be reached from the same end face of the workpiece 2, wherein the lubricant 13 is supplied to the respective machining area in a targeted manner in each case.

REFERENCE NUMERALS

[0033] 1 Machining arrangement

[0034] 2 Bearing part, workpiece

[0035] 3 Honing tool

[0036] 4 Flange

[0037] 5 Bore

[0038] 6 Pressure roller

[0039] 7 Holder, honing stone holder

[0040] 8 Honing stone

[0041] 9 Pressure block

[0042] 10 First raceway

[0043] 11 Second raceway

[0044] 12 Cylindrical section of the workpiece

[0045] 13 Lubricant

[0046] 14 Central inner wall area

[0047] 15 Shaft

[0048] 16 Duct, lubricant duct

[0049] 17 Straight, long section

[0050] 18 Connector

[0051] 19 Widened section

[0052] 20 Transverse duct, transverse section

[0053] 21 Screw

[0054] 77 Intermediate section

[0055] 23 Diagonally positioned section of the duct

[0056] 24 Diagonally positioned section of the duct

[0057] 25 Screw

[0058] 26 Screw

[0059] 27 Straight, short section, transition section

[0060] 28 Straight, short section, transition section

[0061] 29 Screw

[0062] 30 Screw

[0063] 31 End section

[0064] 32 End section