FRICTION RING WITH SECURING ELEMENTS FOR A TRACK WHEEL

Abstract

In order to provide a track wheel, in particular a friction ring for a track wheel, which allows for effective cooling of a braking device of the track wheel, a friction ring (100) for a track wheel of a rail vehicle is proposed, comprising a friction side with a friction surface and a rear side (10) facing away from the friction side, wherein securing elements (11) are arranged on the rear side (10) protruding from the rear side (10), wherein the securing elements (11) have a substantially triangular shape when viewed from above, wherein it is provided that each of the securing elements (11) comprises a radial length R, wherein the friction ring (100) comprises an inner diameter Ri and an outer diameter Ra, and wherein R=0.30-0.90 (Ra-Ri).

Claims

1. Friction ring for a track wheel of a rail vehicle, comprising a friction side with a friction surface and a rear side facing away from the friction side, wherein securing elements projecting from the rear side are arranged on the rear side (10), wherein the securing elements have a substantially triangular shape when viewed from above, wherein each of the securing elements comprises a radial length R, wherein the friction ring comprises an inner diameter R.sub.i and an outer diameter R.sub.a, and wherein R=0.30-0.90 (R.sub.a-R.sub.i).

2. Friction ring according to claim 1, wherein the securing elements are arranged evenly spaced along a circumferential direction of the friction ring, in particular evenly spaced.

3. Friction ring according to claim 1, wherein each of the securing elements comprises three flank sides wherein the three flank sides are connected to one another by three corner portions, wherein all of the corner portions are formed round.

4. (canceled)

5. Friction ring according to claim 3, wherein at least two inner flank sides, are formed convex.

6. Friction ring according to claim 3, wherein a first, outer flank side is oriented along the circumference of the friction ring and perpendicular to a radial direction.

7. Friction ring according to claim 6, wherein the first, outer flank side is formed flat.

8. Friction ring according to claim 1, wherein R=0.50-0.70 (R.sub.a-R.sub.i), or wherein R=0.55-0.65 (R.sub.a-R.sub.i).

9. Friction ring according to claim 6, wherein the first flank side has a length l.sub.1 as viewed in the circumferential direction of the friction ring, wherein |1=0.40-0.60-R or l.sub.1=0.45-0.55-R, or l.sub.1=0.40-0.50-R.

10. Friction ring according to claim 3, wherein for a radius of curvature r.sub.2 of a first and a second corner portion respectively between a first, outer flank side on the one hand and a second, inner flank side and a third, inner flank side on the other hand the following applies: r.sub.2=0.15-0.29-R, or r.sub.2=0.17-0.27-R, or r.sub.2=0.20-0.24-R.

11. Friction ring according to claim 3, wherein for a radius of curvature r.sub.4 of a third corner portion between a second, inner and a third, inner flank side the following applies: r.sub.4=0.10-0.28-R, or r.sub.4=0.14-0.24-R, or r.sub.4=0.18-0.20-R.

12. Friction ring according to claim 5, wherein for a radius of curvature r.sub.3 of each of the convex flank sides the following applies: r.sub.3=0.5-1.00-R, or r.sub.3=0.7-0.8 R, or r.sub.3=0.72-0.75-R.

13. Friction ring according to claim 1, wherein at least three, radial centering grooves are arranged in the rear side.

14. Friction ring according to claim 1, wherein at least one cooling fin extending radially outwards is arranged on the rear side and/or wherein at least one circulation element, which is formed round, is arranged on the rear side.

15. (canceled)

16. Friction ring according to claim 1, wherein the at least one cooling element and/or the at least one circulation element, is associated with each securing element.

17. Friction ring according to claim 1, wherein the friction ring comprises several friction ring segments.

18. Friction ring according to claim 17, wherein the friction ring segments are connected to one another by means of connecting bolts.

19. Friction ring according to claim 1, wherein at least one of the securing elements comprises a through hole through the friction ring or a blind hole.

20. Friction ring according to claim 19, wherein each of the securing elements comprises a through hole through the friction ring or a blind hole (19), and wherein securing elements with a through hole (18) and a blind hole (19) alternate as viewed in the circumferential direction of the friction ring.

21. Track wheel of a rail vehicle, having at least two friction rings according to claim 1.

22. Rail vehicle having at least one track wheel according to claim 21.

Description

[0042] The invention is explained in more detail below with reference to examples of embodiments. The figures show the following:

[0043] FIG. 1 shows a top view of a friction ring with securing elements,

[0044] FIG. 2 shows a perspective view of the friction ring,

[0045] FIG. 3a shows a sectional top view of a securing element,

[0046] FIG. 4 shows a sectional top view of two securing elements as well as a cooling fin and circulation elements,

[0047] FIG. 5 shows a cross-sectional view through a circulation element, and

[0048] FIG. 6 shows a cross-sectional view through the cooling fin.

[0049] FIG. 1 shows a friction ring 100 in a plan view. The friction ring 100 has a friction side not shown here and a rear side 10 facing away from the friction side. Furthermore, the friction ring has an inner diameter R.sub.i and an outer diameter R.sub.a. Eight securing elements 11 are arranged on the rear side 10, wherein the securing elements arranged evenly spaced along the circumference of the friction ring 100. The securing elements 11 have a triangular basic shape. In particular, an abutment surface, which is formed as a plateau, has a triangular basic shape.

[0050] The securing elements 11 are each formed of the same design. Each securing element 11 has a flank surface 12 which extends along a circumference of the securing element 11. Furthermore, the securing element 11 has a first flank side 13a, a second flank side 13b, and a third flank side 13c. The first flank portion 13a is substantially planar in shape and is oriented along an outer periphery of the friction ring 100. Thus, a surface normal of the first flank side 13a extends along a radial extent of the friction ring 100.

[0051] The two other flank sides 13b and 13c are formed convex. The flank sides 13b and 13c are arranged to extend substantially from an outer periphery to an inner periphery of the friction ring 100. The securing element 11 further has a first corner portion 14a, a second corner portion 14b, and a third corner portion 14c. The corner portions 14a, 14b, 14c are formed rounded. The first corner portion 14a and the second corner portion 14b have the same radius of curvature r.sub.2 and are arranged facing the outer circumferential surface of the friction ring 100. The third corner portion 14c has a radius of curvature r.sub.4 that is different, in particular smaller, than the radius of curvature r.sub.2 of the first corner portion and the second corner portion, respectively. The third corner portion 14c is arranged facing an inner circumferential surface of the friction ring 100 and is oriented toward a center of the friction ring 100.

[0052] Furthermore, the friction ring 100 has cooling elements 16 in the form of cooling fins as well as circulation elements 17, which will be described in more detail below.

[0053] Each of the securing elements 11 has either a through hole 18 or a blind hole 19. As shown in FIGS. 1 and 2, securing elements 11 with a blind hole 19 and securing elements 11 with a through hole 18 alternate. As a result, two friction rings 100 on a track wheel can advantageously be arranged opposite each other on two sides of the wheel web and alternately fastened in such a way that a securing element 11 with a through hole 18 of a first friction ring 100 is opposite a securing element 11 with a blind hole 19 of a second friction ring 100 in order to guide a securing element through the through hole 18 into the blind hole 19.

[0054] FIG. 2 shows the friction ring 100 in a perspective view. In particular, the flank sides 13a, 13b, 13c can be seen. It can also be seen that a transition portion 15 between the flank surface or flank sides 13a, 13b,13c and the corner portions 14a, 14b, 14c on the one hand and the rear side 10 of the friction ring 100 on the other hand is formed rounded or concave along a circumference of the securing element 11.

[0055] In FIG. 2, it can further be seen that the friction ring 100 is composed of friction ring segments. In the embodiment shown here, the friction ring 100 is composed of four friction ring segments 20a, 20b, 20c, 20d. The friction ring segments 20a, 20b, 20c, 20d are connected to each other by means of connecting bolts not shown here. The friction ring segments 20a, 20b, 20c, 20d are formed substantially in the same way. Each of the friction ring segments 20a, 20b, 20c, 20d has two securing elements 11.

[0056] FIG. 3 shows a detailed view of a securing element 11. The three flank sides 13a, 13b, 13c and the three corner portions 14a, 14b, 14c, which connect the flank sides 13a, 13b, 13c to one another, can be seen. The flank sides 13a, 13b, 13c have a flat or a convex shape, each of which merges into the rounded shape of the corner portions 14a, 14b, 14c.

[0057] The securing element has a radial length R, which may be 90 mm, for example. The radii of curvature r.sub.2 of the outer, first and second corner portions 14, 14b can be 20 mm, for example. The radius of curvature r.sub.4 of the inner, third corner portion 14c can be 17 mm, for example.

[0058] The first flank side 13a is formed flat and has a length l.sub.1, which can be 45 mm, for example. The length l.sub.1 is the section of the first flank side 13a between the first and second corner portions 14a, 14b, which is straight or flat, respectively. The two remaining flank sides 13b, 13c are each formed convex with the same radius of curvature r.sub.3, where r.sub.3 can be 67 mm, for example. The flank sides 13a, 13b, 13c run obliquely and include an angle with the surface normal of the rear side 11 of the friction ring 100. This angle may be 8, for example.

[0059] In FIG. 4, a sectional top view of two securing elements 11 of the friction ring 100 is shown. A cooling element 16 is arranged between the two securing elements 11. The cooling element 16 is configured as a cooling fin which extends in a radial direction. The cooling fin has a height which does not exceed the height of the securing elements 11. The cooling fin has a substantially trapezoidal shape. Circulation elements 17 are arranged laterally next to the cooling element 16. In each case, two circulation elements 17 are arranged between the cooling element 16 and one of the securing elements 11. In each case, circulation elements 17 are arranged in a portion of the outer circumference 22 and in a portion of the inner circumference 23 of the friction ring 100.

[0060] FIG. 5 shows a cross-section through a circulation element 17. The circulation element 17 has the shape of a round pin, the upper side of which has a rounded, circumferential edge or crest. FIG. 6 shows a cross-section through the cooling element 16. The cooling element 16 has obliquely extending flanks and also an upper side with rounded, radially extending edges. Both the circulation element 17 and the cooling element 16 have a rounded or concave transition region between the flank surfaces of the respective elements and the rear side 12 of the friction ring 100.

LIST OF REFERENCE SIGNS

[0061] 100 friction ring [0062] 10 rear side of the friction ring [0063] 11 securing element [0064] 12 flank surface [0065] 13a first flank side [0066] 13b second flank side [0067] 13c third flank side [0068] 14a first corner portion [0069] 14b second corner portion [0070] 14c third corner portion [0071] l.sub.1 length of the first flank portion [0072] r.sub.2 radius of curvature of the first and second corner portion [0073] r.sub.3 radius of curvature of the first and/or the second flank portions [0074] r.sub.4 radius of curvature of the third corner portion [0075] R radial length of the securing element [0076] R.sub.i inner diameter of the friction ring [0077] R.sub.a outer diameter of the friction ring [0078] 15 transition portion [0079] 16 cooling element [0080] 17 circulation element [0081] 18 through hole [0082] 19 blind hole [0083] 20a, 20b, [0084] 20c, 20d friction ring segments