SPUR TOOTHING SYSTEM FOR WHEEL BEARING ARRANGEMENT

Abstract

A spur toothing system for a wheel bearing arrangement includes a plurality of radially extending teeth configured to axially engage mating teeth of a counter-toothing system. Each one of the radially extending teeth includes a tooth base plane, a pair of tooth flanks and a tooth tip. The tooth base is plane defined at a radial height where a width of the one of the radially extending teeth is equal to a gap between the one of the radially extending teeth and an adjacent one of the radially extending teeth. The pair of tooth flanks has a common tooth flank height measured radially from the tooth base plane and the tooth tip has a tooth tip height measured radially from the tooth base plane. The tooth tip merges tangentially into each of the pair of tooth flanks and is formed from at least two tangential radii.

Claims

1. A spur toothing system for a wheel bearing arrangement, having: a plurality of teeth which are arranged on the spur side, extend radially, and are configured to engage axially into teeth of a counter-toothing system, wherein each of the teeth has tooth flanks and a tooth tip which have a predefined tooth flank height (h5) and a predefined tooth tip height (h6) in relation to a tooth base plane, wherein the tooth flanks and the tooth tip merge tangentially into one another, and wherein the tooth tip is formed from at least two radii which are coupled substantially tangentially to one another.

2. The spur toothing system according to claim 1, wherein the tooth tip is formed from two flank radii and a tip radius, wherein the two flank radii and the tip radius are each smaller than a single tangential connecting radius which is configured to form the tooth tip and laterally merges substantially tangentially into the tooth flanks.

3. The spur toothing system according to claim 2, wherein the flank radii and the tip radius are coupled substantially tangentially to one another via connecting geometries.

4. The spur toothing system according to claim 3, wherein the connecting geometries are formed as connecting straight lines or connecting radii or free-form connecting lines.

5. The spur toothing system according to claim 4, wherein the connecting straight lines are formed as connecting tangents which tangentially connect the flank radii and the tip radius to one another.

6. The spur toothing system according to claim 1, wherein the tooth tip is formed from two flank radii and a tip radius, wherein the two flank radii are each smaller than a single tangential connecting radius which is configured to form the tooth tip and laterally merges tangentially into the tooth flanks, and wherein the tip radius is greater than the single tangential connecting radius.

7. The spur toothing system according to claim 6, wherein the two flank radii and the tip radius merge tangentially into one another.

8. The spur toothing system according to claim 2, wherein at a predefined equal tooth flank height (h5, h5), the tooth tip height (h6) of the tooth with the tooth tip from the two flank radii and the tip radius is smaller than a tooth tip height (h6) of the tooth with the tooth tip from the single tangential connecting radius.

9. The spur toothing system according to claim 2, wherein at a predefined equal tooth tip height (h6, h6), the tooth flank height (h5) of the tooth with the tooth tip from the two flank radii and the tip radius is greater than a tooth flank height (h5) of the tooth with the tooth tip from the single tangential connecting radius.

10. The spur toothing system according to claim 2, wherein the tooth tip height (h6) of the tooth with the tooth tip from the two flank radii and the tip radius is smaller than the tooth tip height (h6) of the tooth with the tooth tip from the single tangential connecting radius, if the tooth flank height (h5) of the tooth with the tooth tip from the two flank radii and the tip radius is smaller or greater than the tooth flank height (h5) of the tooth with the tooth tip from the single tangential connecting radius.

11. A spur toothing system for a wheel bearing arrangement, comprising a plurality of radially extending teeth configured to axially engage mating teeth of a counter-toothing system, each one of the plurality of radially extending teeth comprising: a tooth base plane defined at a radial height where a width of the one of the plurality of radially extending teeth is equal to a gap between the one of the plurality of radially extending teeth and an adjacent one of the plurality of radially extending teeth; a pair of tooth flanks comprising a common tooth flank height measured radially from the tooth base plane; and a tooth tip comprising a tooth tip height measured radially from the tooth base plane, the tooth tip merging tangentially into each of the pair of tooth flanks and formed from at least two tangential radii.

12. The spur toothing system of claim 11, wherein: the tooth tip is formed from two flank radii and a tip radius; and the two flank radii and the tip radius are each smaller than a single tangential connecting radius configured to form the tooth tip and tangent to each of the pair of tooth flanks.

13. The spur toothing system of claim 12, wherein the tooth tip further comprises connecting geometries extending tangentially from the tip radius to each of the two flank radii.

14. The spur toothing system of claim 13, wherein the connecting geometries are formed as: connecting straight lines; connecting radii; or free-form connecting lines.

15. The spur toothing system of claim 12, wherein: the common tooth flank height is equal to a single tangential connecting radius tooth flank height measured radially from the tooth base plane; and the tooth tip height is less than a single tangential connecting radius tooth tip height measured radially from the tooth base plane.

16. The spur toothing system of claim 12, wherein: the common tooth flank height is equal to a single tangential connecting radius tooth flank height measured radially from the tooth base plane; and the tooth tip height is greater than a single tangential connecting radius tooth tip height measured radially from the tooth base plane.

17. The spur toothing system of claim 11, wherein: the tooth tip is formed from two flank radii and a tip radius; the two flank radii are each smaller than a single tangential connecting radius configured to form the tooth tip and tangent to each of the pair of tooth flanks; and the tip radius is greater than the single tangential connecting radius.

18. The spur toothing system of claim 17, wherein the tip radius is tangent to each of the two flank radii.

19. The spur toothing system of claim 17, wherein: the common tooth flank height is equal to a single tangential connecting radius tooth flank height measured radially from the tooth base plane; and the tooth tip height is less than a single tangential connecting radius tooth tip height measured radially from the tooth base plane.

20. The spur toothing system of claim 17, wherein: the common tooth flank height is equal to a single tangential connecting radius tooth flank height measured radially from the tooth base plane; and the tooth tip height is greater than a single tangential connecting radius tooth tip height measured radially from the tooth base plane.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present disclosure is described in more detail below together with the description of an exemplary embodiment based on the figures. In the figures:

[0027] FIG. 1 shows a schematic representation of a spur toothing system,

[0028] FIG. 2 shows a schematic representation of a tooth tip shape of a tooth of the spur toothing system according to one embodiment;

[0029] FIG. 3 shows a schematic representation of a further tooth tip shape of a tooth of the spur toothing system according to one embodiment;

[0030] FIG. 4 shows a schematic representation of a further tooth tip shape of a tooth of the spur toothing system according to one embodiment; and

[0031] FIG. 5 shows a schematic representation of a further tooth tip shape of a tooth of the spur toothing system according to one embodiment.

DETAILED DESCRIPTION

[0032] FIG. 1 shows an exemplary schematic representation of a spur toothing system 1 in a perspective view. The spur toothing system 1 has a plurality of teeth 2, which are separated in the circumferential direction by tooth gaps 3 and are arranged on a surface, for example an end face of a shaft. A tooth profile 4 of the teeth 2 is formed in the axial direction A, in this case the direction of the axis of rotation X. The direction of extension of the teeth 2 corresponds to the radial direction R.

[0033] Each of the teeth 2 has tooth flanks 5 and a tooth tip 6. The tooth flanks 5 are formed on lateral surfaces of the tooth 2 and merge tangentially into the tooth tip 6, which forms the tip of the tooth 2 substantially centrally and comprises the highest point of a tooth 2 as viewed in the axial direction A.

[0034] The spur toothing system 1 can also be referred to as a Hirth toothing system and is an axially effective toothing that can be used as a form-fitting coupling of rotating elements, for example to couple driven wheel bearings to the drive shaft, for torque transmission. For this purpose, the spur toothing system 1 engages in the axial direction A in a correspondingly designed counter-toothing system (not shown). In such a connection, the teeth 2 lie statically and flat against the teeth of the counter-toothing system.

[0035] FIGS. 2 to 5 show schematic representations of a tooth profile 4 of a tooth 2 of the spur toothing system 1 for forming the tooth flanks 5 and the tooth tip 6 according to various embodiments of the present disclosure. Here, the tooth tip 6 is formed by several radii, each of which is tangentially connected to the other and merges tangentially into the tooth flanks 5.

[0036] FIG. 2 shows a front view of the tooth profile 4 to illustrate a possible tooth tip shape according to one embodiment of the present disclosure, in which the tooth tip 6 is formed by a total of three radii, two flank radii 7 and a tip radius 8. In FIG. 2, the two flank radii 7 and the tip radius 8 are equal in size, and the two flank radii 7 are arranged so as to merge tangentially into the tooth flanks 5 on the sides of the tooth profile 4. The tip radius 8 is arranged higher than the flank radii 7 when viewed in the axial direction A, and the flank radii 7 and the tip radius 8 are tangentially connected via connecting tangents 9 to form the tooth tip 6.

[0037] In addition, FIG. 2 shows a single tangential connecting radius 10, which merges tangentially into tooth flanks 5 on both sides. The single tangential connecting radius describes the possibility of forming the shape of a tooth tip 6 with only one radius. Therefore, the single tangential connecting radius can also be referred to as a single tangential tooth tip radius 11. Both the flank radii 7 and the tip radius 8 are smaller than the single tangential connecting radius 10.

[0038] It can be seen that a tooth tip height h6 of the tooth tip 6 formed by the two flank radii 7 and the tip radius 8 tangentially connected to one another by the connecting tangents 9 is smaller than a tooth tip height h6 of the tooth tip 6 formed by the single tangential connecting radius 10, if a tooth flank height h5 of the tooth 2 with the tooth tip 6 is equal to a tooth flank height h5 of a tooth 2 with the tooth tip 6. The tooth flank height h5, h5 and the tooth tip height h6, h6 are measured in relation to a tooth base plane 12. The tooth base plane 12 corresponds to the plane in which the tooth 2 and an adjacent tooth gap 3 are of equal width.

[0039] Due to the lower tooth tip height h6, the degree of forming required to produce the shape of the tooth tip 6 is lower than that required to produce the shape of the tooth tip 6. In addition, the tooth tip 6 is more pointed than the tooth tip 6, which improves the ease of assembly. The term ease of assembly refers to the assembly, i.e., the joining, of the spur toothing system 1 with a correspondingly designed counter-toothing system. A more pointed shape of the tooth tip 6 reduces the risk of a tooth-on-tooth positioning during assembly of the spur toothing system 1 with the correspondingly designed counter-toothing system.

[0040] FIG. 3 shows a front view of the tooth profile 4 to illustrate a possible tooth tip shape according to one embodiment, in which the tooth tip 6 is formed from the two flank radii 7 and the tip radius 8, as in FIG. 2. The embodiment shown in FIG. 3 is similar to the embodiment shown in FIG. 2, so only the differences will be discussed below.

[0041] In FIG. 3, the tooth tip height h6 of tooth 2 with the tooth tip 6 is equal to the tooth tip height h6 of the tooth 2 with the tooth tip 6. It can be seen that for the same tooth tip height, the tooth flank height h5 of the tooth flank 5 of the tooth 2 with the tooth tip 6 is greater than the tooth flank height h5 of a tooth flank 5 of the tooth 2 with the tooth tip 6. The increased tooth flank height h5 provides a larger contact area for torque transmission when engaging with a correspondingly designed counter-toothing system. This enables improved torque transmission during operation. In addition, the tooth tip 6 is more pointed than the tooth tip 6, which improves the ease of assembly.

[0042] In FIGS. 2 and 3, the flank radii 7 are equal in size to the tip radius 8. However, it is also conceivable that the flank radii 7 and the tip radius 8 are different, and both the flank radii 7 and the tip radius 8 are smaller than the single tangential connecting radius 10. The two flank radii 7 may be equal in size to obtain a substantially symmetrical tooth profile 4.

[0043] FIG. 4 shows a front view of the tooth profile 4 to illustrate a possible tooth tip shape according to one embodiment, in which the tooth tip 6 is formed by a total of three radii, two flank radii 7 and a tip radius 8. In FIG. 4, the two flank radii 7 are equal in size, wherein the two flank radii 7 are arranged so as to merge tangentially into the tooth flanks 5 on the sides of the tooth profile 4. The tip radius 8 is greater than the flank radii 7 and, viewed in the axial direction A, is arranged in such a way that the tip radius 8 merges tangentially into the flank radii 7 to form the tooth tip 6.

[0044] In addition, FIG. 4 shows the single tangential connecting radius 10, which merges tangentially into the tooth flanks 5 on both sides. The flank radii 7 according to the embodiment shown in FIG. 4 are smaller than the single tangential connecting radius 10, while the tip radius 8 is greater than the single tangential connecting radius 10.

[0045] It can be seen that the tooth tip height h6 of the tooth tip 6 formed by the two flank radii 7 and the tip radius 8 merging tangentially into one another is smaller than a tooth tip height h6 of the tooth tip 6 formed by the single tangential connecting radius 10, if the tooth flank height h5 of the tooth 2 with the tooth tip 6 is equal to the tooth flank height h5 of a tooth 2 with the tooth tip 6.

[0046] Due to the lower tooth tip height h6, the degree of forming required to produce the shape of the tooth tip 6 is lower than that required to produce the shape of the tooth tip 6. In addition, the lower tooth tip height h6 improves the ease of assembly because the lower degree of forming significantly reduces or even completely prevents a plateau formation on the tooth tip 6. This reduces the risk of a tooth-on-tooth positioning during assembly of the spur toothing system 1 with the correspondingly designed counter-toothing system.

[0047] FIG. 5 shows a front view of the tooth profile 4 to illustrate a possible tooth tip shape according to one embodiment, in which the tooth tip 6 is formed from the two flank radii 7 and the tip radius 8, as in FIG. 4. The embodiment shown in FIG. 5 is similar to the embodiment shown in FIG. 4, so only the differences will be discussed below.

[0048] In FIG. 5, the tooth tip height h6 of tooth 2 with the tooth tip 6 is equal to the tooth tip height h6 of the tooth 2 with the tooth tip 6. It can be seen that for the same tooth tip height, the tooth flank height h5 of the tooth flank 5 of the tooth 2 with the tooth tip 6 is greater than the tooth flank height h5 of a tooth flank 5 of the tooth 2 with the tooth tip 6. The increased tooth flank height h5 provides a larger contact area for torque transmission when engaging with a correspondingly designed counter-toothing system. This enables improved torque transmission during operation. In addition, the tooth tip 6 is formed flatter than the tooth tip 6, reducing the degree of forming required to produce the shape of the tooth tip 6, which improves the ease of assembly and/or reduces the risk of a tooth-on-tooth positioning during assembly of the spur toothing system 1 with the correspondingly designed counter-toothing system.

[0049] From the synopsis of the figures, it can be seen that the formation of the tooth tip 6 by a plurality of radii is significantly more flexible with regard to the design of the tooth flank height and the tooth tip height and/or the tooth tip shape than the single tangential connecting radius. This allows for the spur toothing system 1, e.g., the teeth 2, to be adapted to the respective requirements of the intended application.

REFERENCE NUMERALS

[0050] 1 Spur toothing system [0051] 2 Tooth [0052] 3 Tooth gap [0053] 4 Tooth profile [0054] 5, 5 Tooth flank [0055] 6, 6 Tooth tip [0056] 7 Flank radius [0057] 8 Tip radius [0058] 9 Connecting tangent [0059] 10 Single tangential connecting radius [0060] 11 Single tangential tooth tip radius [0061] 12 Tooth base plane [0062] A Axial direction [0063] R Radial direction [0064] X Axis of rotation [0065] h5, h5 Tooth flank height [0066] h6, h6 Tooth tip height