Friction ring with fixing elements for a truck wheel - Patents.com

Abstract

In order to provide a truck wheel, in particular a friction ring for a truck wheel, which allows for effective cooling of the brake device of the truck wheel, a friction ring (100) for a track vehicle track wheel is proposed, which comprises a friction face having a friction surface and a rear face (10) facing away from said friction face, and it is provided that fixing elements (11) protruding from the rear face (10) are arranged on the rear face (10), the fixing elements (11) have a substantially triangular shape when viewed from above, each of the fixing elements (11) has a radial length R, and the friction ring (100) has an inner radius R i and outer diameter R a and R = 0.30-0.90 (R a -R i ).

Description

[Technical field]

[0001] The present invention relates to a friction ring for a track wheel of a track vehicle, to a track wheel equipped with said friction ring, and to a track vehicle equipped with said track wheel. [Background technology]

[0002] The braking equipment of track vehicles usually comprises a brake disc having at least one friction ring with a friction surface. The friction ring is attached to one side of the track wheel, in particular to the web of the track wheel. By actuating the brake cylinder, brake pads are applied to the friction surface of the friction ring, thereby generating a braking force.

[0003] It is often a problem that the heat generated during the braking process must be dissipated to prevent the brake system from overheating. For this purpose, various cooling concepts are known from the prior art, which comprise cooling elements, for example, by means of which the heat generated during the braking process can be dissipated into the environment.

[0004] Although a certain cooling effect can be achieved with the cooling concepts known from the prior art, this is often insufficient and an optimized cooling concept is required, which dissipates the heat more effectively.

[0005] The invention is therefore based on the object of providing a truck wheel, in particular a friction ring for a truck wheel, which allows an effective cooling of the braking device of the truck wheel. Summary of the Invention

[0006] The problem according to the invention is solved by a friction ring for a track wheel of a rail vehicle, which has a friction face with a friction surface and a rear face facing away from said friction face, on which a fixing element protruding from the rear face is arranged, the fixing element having an essentially triangular shape when viewed from above, where a view of the fixing element from above means a top view of the rear face of the friction ring or of the abutment face of the fixing element for the abutment of the friction ring against the wheel web.

[0007] The friction ring can be attached to the wheel web of the truck wheel by means of the fastening elements. In the fastened state, the rear face of the friction ring faces the wheel web. As a result of the fastening elements arranged on the rear face forming a gap between the rear face of the friction ring and the wheel web, cooling air, in particular ambient air, can advantageously circulate in this gap. As a result, heat can advantageously be dissipated from the friction ring, in particular from the friction surface, via the rear face.

[0008] In order to optimize the flow of cooling air between the rear faces of the friction rings with regard to improving heat dissipation, the fixing element has an essentially triangular shape when viewed in a cross section parallel to the rear faces, it being shown that with this shape of the fixing element a particularly effective circulation of cooling air between the rear faces of the friction rings and the wheel web can be achieved.

[0009] The term "essentially triangular" should be understood such that the anchoring element does not necessarily have a strict triangular shape in the mathematical geometric sense, for example the corners of the anchoring element do not necessarily have to be pointed or have sharp edges, and the sides of the anchoring element do not necessarily have to be flat or straight.

[0010] Preferably, the fixing elements are arranged in a circumferential direction of the friction ring, in particular equally spaced, in particular the fixing elements have the same angular spacing along the circumference.

[0011] Preferably, an even number of fixing elements is provided, for example 4, 6 or 8. Alternatively, an odd number of fixing elements may be provided, for example 3, 5 or 7 fixing elements.

[0012] Preferably, each of the fixing elements comprises three flanks, the flanks protruding from the rear face of the friction ring. The flanks may be arranged substantially perpendicular to the rear face or may include an angle with a surface normal of the rear face. This angle may be provided, for example, by manufacture, and may be between 6° and 10°, preferably between 7° and 9°, most preferably 8°.

[0013] Preferably, the transition areas between the three flanks and the surface of the rear face of the friction ring are rounded or concavely configured and preferably completely surround the fixing element, which advantageously improves the circulation of the cooling air flow.

[0014] Preferably, the three flank portions are interconnected by three corner portions, at least one of the corner portions, preferably two of the corner portions and very preferably all of the corner portions being rounded. A rounded design of the corner portions advantageously further optimizes the circulation of the cooling air.

[0015] Preferably, at least one of the flanks, preferably two, in particular the two inner flanks, is formed convexly. The inner flanks are preferably flanks that are not aligned along the circumference of the friction ring and do not face the outer region of the friction ring. The convex shape preferably exclusively refers to the substantially radial or oblique radial direction of extension of the respective flank. Preferably, the two flanks have the same convex shape. The convex shape of the flanks also ensures optimized cooling air circulation.

[0016] Preferably, the first outer flank is oriented along the circumference of the friction ring and perpendicular to the radial direction of the friction ring. Preferably, the first outer flank is flat or not curved. Preferably, the fixing element is arranged and oriented on the rear face of the friction ring such that the fixing element has only one outer flank and the other two flanks face substantially inward. In this configuration, one of the corners of the triangular fixing element faces towards the common intersection, which does not have to be located at the centre of the friction ring.

[0017] Preferably, each of the fixing elements has a radial length R. The radial length R is preferably the shortest distance measured on the upper or abutment surface of the fixing element, in particular between the outer flank at its centre, and the corner area between the two inner flanks.

[0018] Preferably, the fixing element has on its upper side a flat abutment surface for abutting against the wheel web of the track wheel, which abutment surface is also preferably essentially triangular in shape.

[0019] Preferably, the friction ring has an inner diameter R i and outer diameter R a and R = 0.30-0.90 (R a -R i ), preferably R = 0.50-0.70 (R a -R i ), particularly preferably R=0.55-0.65 (R a -R i ) These values ​​correspond to the optimum size of the fastening elements in relation to the friction ring, so that on the one hand a secure fastening is provided by a sufficiently large abutment surface between the wheel web and each fastening element, and at the same time sufficient space is provided for the circulation of cooling air.

[0020] Furthermore, any combination of the above lower limit values ​​and upper limit values ​​may be applied to the radial length R.

[0021] In particular, R = 0.50-0.90 (R a -R i ), R = 0.55-0.90 (Ra -R i ), R = 0.65-0.90 (R a -R i ) or R = 0.70-0.90 (R a -R i ) can be applied. Similarly, R = 0.55-0.70 (R a -R i ), R = 0.65-0.70 (R a -R i ) or R = 0.50-0.65(R a -R i ) may be applied.

[0022] Preferably, R is 70 mm to 110 mm, more preferably 80 mm to 100 mm, and most preferably 85 mm to 95 mm. For example, R can be 90 mm.

[0023] Preferably, the first flank has a length l1, as viewed in the circumferential direction of the friction ring, l1=0.40-0.60·R, preferably l1=0.45-0.55·R, particularly preferably l1=0.40-0.50·R. The length l1 of the first flank is preferably the maximum length of a straight or flat line segment of the first flank.

[0024] Preferably, l1 is 30 mm to 60 mm, more preferably 35 mm to 55 mm, and most preferably 40 mm to 50 mm. For example, l1 can be 45 mm.

[0025] Preferably, the radius of curvature r2 of the first and second corner portions between the first outer flank surface on the one hand and the second inner flank surface and the third inner flank surface on the other hand is r2=0.15-0.29·R, preferably r2=0.17-0.27·R and particularly preferably r2=0.20-0.24·R as a whole.

[0026] Preferably, r2 is from 10 mm to 35 mm, more preferably from 12 mm to 30 mm, and most preferably from 15 mm to 25 mm. For example, r2 may be 20 mm.

[0027] Preferably, the radius of curvature r4 of the third corner portion between the second inner flank surface and the third inner flank surface is r4=0.10-0.28·R, preferably r4=0.14-0.24·R, most preferably r4=0.18-0.20·R.

[0028] Preferably, r4 is between 10 mm and 30 mm, more preferably between 12 mm and 25 mm, and most preferably between 15 mm and 20 mm. For example, r4 may be 17 mm. Preferably, the radius of curvature r3 of each of the convex flank surfaces is r3=0.5-1.00·R, preferably r3=0.7-0.8·R, most preferably r3=0.72-0.75·R.

[0029] Preferably, r3 is 55 mm to 80 mm, more preferably 60 mm to 75 mm, and most preferably 65 mm to 70 mm. For example, r3 can be 67 mm.

[0030] The above mentioned parameters result in a geometry of the fastening elements which allows a particularly effective circulation of cooling air, which advantageously improves the heat dissipation.

[0031] Advantageously, the fixing element itself may also contribute to the cooling of the friction ring due to its shape, by dissipating heat through the fixing element.

[0032] Preferably, at least one, preferably two, most preferably three, preferably radial centering grooves are arranged on the rear face. Preferably, a sliding block may be inserted into the centering groove, the centering groove acting to guide the sliding block. The sliding block acts to center the friction ring during thermal expansion. Preferably, the centering grooves are equally spaced along the circumference of the friction ring.

[0033] Preferably, at least one cooling element, particularly preferably a radially outwardly extending cooling fin, is arranged on the rear face. Preferably, one cooling element in each case is arranged between two fixed elements. Preferably, the height of the at least one cooling element is equal to or less than the height of the fixed element relative to the surface of the rear face of the friction ring. Preferably, the at least one cooling element, in particular in the embodiment as a cooling fin, may have a linear or curved shape in top view.

[0034] Preferably, at least one circulation element, in particular of rounded design, is arranged on the rear face. The circulation element serves to further improve the cooling performance by optimizing the path of the cooling air flow between the rear face of the friction ring and the wheel web. Preferably, a plurality of circulation elements are arranged symmetrically on the friction ring. Preferably, a first row of circulation elements is arranged along the outer edge portion of the rear face and a second row of circulation elements is arranged along the inner edge portion of the rear face. Preferably, the circulation elements are arranged respectively between the fixed elements. Preferably, the circulation elements are arranged respectively adjacent, in particular adjacently on both sides, one cooling element. The at least one circulation element can be, for example, a round pin protruding from the surface of the rear face of the friction ring. Preferably, the height of the at least one circulation element is equal to or less than the height of the fixed element relative to the surface of the rear face of the friction ring.

[0035] Preferably, each stationary element is associated with at least one cooling element and / or at least one circulating element. Preferably, the stationary element, the at least one cooling element and / or the at least one circulating element result in a group of elements, such group being arranged repeatedly around the circumference of the friction ring.

[0036] Preferably, the friction ring comprises a plurality of friction ring segments. Preferably, the friction ring segments have the same size. Preferably, the fixing elements are evenly distributed over the friction ring segments. Preferably, the friction ring segments are connected to one another by connecting elements, in particular by connecting bolts.

[0037] Preferably, at least one of the fastening elements comprises a through hole or a blind hole passing through the friction ring, which is used for fastening the friction ring to the wheel web, in particular for a screwed engagement.

[0038] Preferably, each of the fixing elements comprises a through hole or a blind hole through the friction ring, so that, when viewed in the circumferential direction of the friction ring, the fixing elements with through holes and the fixing elements with blind holes alternate. Preferably, two friction rings can be arranged on opposite sides of the track wheel, preferably such that the fixing elements with blind holes face the fixing elements with through holes. This allows the fixing elements, for example screws, to be advantageously guided through the through holes of the first friction disc into the blind holes of the second friction ring and fixed or screwed there.

[0039] The problem according to the invention is further solved by a track wheel having at least one, preferably two, friction rings having the above mentioned characteristics.

[0040] Furthermore, the object of the present invention is achieved by a track vehicle having a track wheel as described above. [Brief description of the drawings]

[0041] [Figure 1] FIG. 2 shows a top view of a friction ring with a fixing element. [Diagram 2] FIG. [Diagram 3] 1 shows a top cross-sectional view of a fixation element. [Figure 4] A top cross-sectional view of two stationary elements as well as cooling fins and circulation elements is shown. [Diagram 5] A cross section through a circulation element is shown. [Figure 6] A cross section through the cooling fins is shown. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0042] In the following, the invention will be explained in more detail with reference to examples of embodiment.

[0043] 1 shows in plan view a friction ring 100. The friction ring 100 has a friction surface, not shown here, and a rear surface 10 facing away from the friction surface. i and outer diameter R a Eight fixing elements 11 are arranged on the rear face 10, the fixing elements being equally spaced along the circumference of the friction ring 100. The fixing elements 11 have a triangular basic shape. In particular, the abutment surface, which is formed as a plateau, has a triangular basic shape.

[0044] The fixing elements 11 are each formed with the same design. Each fixing element 11 has a flank surface 12 extending along the circumference of the fixing element 11. Furthermore, the fixing element 11 has a first flank surface 13a, a second flank surface 13b and a third flank surface 13c. The first flank surface 13a is substantially planar in shape and oriented along the outer circumference of the friction ring 100. Thus, the surface normal of the first flank surface 13a extends along the radial extent of the friction ring 100.

[0045] The two other flank surfaces 13b and 13c are formed convexly. The flank surfaces 13b and 13c are arranged to extend substantially from the outer periphery to the inner periphery of the friction ring 100. The fixing element 11 further comprises 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 r2 and are arranged facing the outer periphery of the friction ring 100. The third corner portion 14c has a radius of curvature r4 different from the respective radii of curvature r2 of the first corner portion and the second corner portion, in particular a smaller radius of curvature r4. The third corner portion 14c is arranged facing the inner periphery of the friction ring 100 and is oriented towards the center of the friction ring 100.

[0046] Furthermore, the friction ring 100 also has cooling elements 16 in the form of cooling fins as well as circulation elements 17 which will be described in more detail below.

[0047] Each of the fixing elements 11 has either a through hole 18 or a blind hole 19. As shown in Figures 1 and 2, the fixing elements 11 with blind holes 19 and the fixing elements 11 with through holes 18 alternate. As a result, two friction rings 100 on a truck wheel can be advantageously arranged opposite each other on two faces of the wheel web and fastened alternately such that the fixing element 11 with the through hole 18 of the first friction ring 100 faces the fixing element 11 with the blind hole 19 of the second friction ring 100 in order to guide the fixing element through the through hole 18 into the blind hole 19.

[0048] 2 shows the friction ring 100 in a perspective view. In particular, the flank surfaces 13a, 13b, 13c can be seen. It can also be seen that the transition 15 between the flank surfaces, i.e. the flank surfaces 13a, 13b, 13c and the corner portions 14a, 14b, 14c on the one hand, and the rear face 10 of the friction ring 100 on the other hand, is rounded or concavely formed along the circumference of the fixing element 11.

[0049] In Fig. 2 it can also be seen that the friction ring 100 consists of friction ring segments. In the embodiment shown, the friction ring 100 consists of four friction ring segments 20a, 20b, 20c, 20d. The friction ring segments 20a, 20b, 20c, 20d are connected to one another by connecting bolts, not shown here. The friction ring segments 20a, 20b, 20c, 20d are formed in substantially the same manner. Each of the friction ring segments 20a, 20b, 20c, 20d has two fixing elements 11.

[0050] Figure 3 shows a detailed view of the fastening element 11. It is possible to see the three flank surfaces 13a, 13b, 13c and the three corner portions 14a, 14b, 14c which interconnect the flank surfaces 13a, 13b, 13c. The flank surfaces 13a, 13b, 13c have a flat or convex shape, each of which merges with the rounded shape of the corner portion 14a, 14b, 14c.

[0051] The fixing element has a radial length R, which may be, for example, 90 mm. The radius of curvature r2 of the outer first and second portions 14a, 14b may be, for example, 20 mm. The radius of curvature r4 of the inner third corner portion 14c may be, for example, 17 mm.

[0052] The first flank surface 13a is formed flat and has a length l1, which may be, for example, 45 mm. The length l1 is the line segment of the first flank surface 13a between the first corner portion 14a and the second corner portion 14b, which are respectively straight or flat. Each of the two remaining flank surfaces 13b, 13c is formed convexly with the same radius of curvature r3, which may be, for example, 67 mm. The flank surfaces 13a, 13b, 13c extend obliquely and include a predetermined angle with the surface normal of the rear face 10 of the friction ring 100. This angle may be, for example, 8°.

[0053] In FIG. 4 a cross-sectional top view of two fixed elements 11 of a friction ring 100 is shown. A cooling element 16 is arranged between the two fixed elements 11. The cooling element 16 is configured as a radially extending cooling fin. The cooling fin has a height that does not exceed the height of the fixed elements 11. The cooling fin has a substantially trapezoidal shape. A circulation element 17 is arranged laterally adjacent to the cooling element 16. In each case, the two circulation elements 17 are arranged between the cooling element 16 and one of the fixed elements 11. In each case, the circulation elements 17 are arranged on a part of the outer circumference 22 and on a part of the inner circumference 23 of the friction ring 100.

[0054] Figure 5 shows a cross section through the circulation element 17. The circulation element 17 has the shape of a rounded pin, the upper surface of which has a rounded circumferential edge, i.e. a crest. Figure 6 shows a cross section through the cooling element 16. The cooling element 16 also has an upper surface with obliquely extending flanks and rounded radially extending edges. Both the circulation element 17 and the cooling element 16 have rounded or concave transition areas between the flank surfaces of the respective elements and the rear face 10 of the friction ring 100. [Explanation of symbols]

[0055] 100 Friction Ring 10 Rear face of friction ring 11 Fixed elements 12 Flank Surface 13a First flank surface 13b Second flank surface 13c Third flank 14a First corner 14b Second corner part 14c Third corner l1: Length of the first flank r2 Radius of curvature of the first and second corner portions r3 Radius of curvature of the first and / or second flank r4 Radius of curvature of the third corner R radial length of the fixing element R i Friction ring inner diameter R a Friction Ring Outer Diameter 15 Transition 16 Cooling Elements 17 Circulating elements 18 Through hole 19 Blind Hole 20a, 20b, 20c, 20d Friction ring segments 21 Connection bolt 22 Outer circumference 23 Inner circumference

Claims

1. A friction ring (100) for a track wheel of a rail vehicle, comprising a friction face having a friction surface and a rear face (10) facing away from said friction face, said fixing elements (11) protruding from said rear face (10) are arranged on said rear face (10), said fixing elements (11) having a substantially triangular shape when viewed from above, each of said fixing elements (11) having a radial length R, said friction ring (100) having an inner radius R ｉ and outer diameter R ａ and R = 0.30-0.90 (R ａ -R ｉ ), the friction ring (100).

2. Friction ring (100) according to claim 1, characterized in that the fixing elements (11) are arranged, in particular equidistantly, along the circumferential direction of the friction ring (100).

3. Friction ring (100) according to claim 1, wherein each of the fixing elements (11) has a flank surface (12) extending along the circumference of the fixing element (11), the flank surface (12) comprising three flank faces (13a, 13b, 13c).

4. 4. A friction ring (100) according to claim 3, wherein the three flank surfaces (13a, 13b, 13c) are interconnected by three corner portions (14a, 14b, 14c), at least one of the corner portions (14a, 14b, 14c), preferably two of the corner portions (14a, 14b, 14c), very particularly preferably all of the corner portions (14a, 14b, 14c) being formed rounded.

5. Friction ring (100) according to claim 3, wherein at least one, preferably two, in particular the two inner flanks (13b, 13c) of two of the three flanks (13a, 13b, 13c) are formed convexly.

6. 4. The friction ring (100) of claim 3, wherein the first outer flank surface (13a) is oriented along a circumference of the friction ring (100) and perpendicular to a radial direction.

7. Friction ring (100) according to claim 6, wherein the first outer flank surface (13a) is formed flat.

8. R=0.50-0.70(R ａ -R ｉ ), preferably R = 0.55-0.65 (R ａ -R ｉ Friction ring (100) according to claim 1, wherein:

9. Each of the fixing elements (11) has a radial length R, and the first of the flank surfaces (13) has a length l when viewed in the circumferential direction of the friction ring (100). １ and l １ = 0.40 - 0.60 R, preferably l １ = 0.45 - 0.55 R, more preferably l １ Friction ring (100) according to claim 7, wherein R = 0.40 - 0.50 R.

10. Each of said fixing elements (11) has a radial length R and a radius of curvature r of first and second corner portions (14a, 14b) between a first outer flank surface (13a) on the one hand and a second inner flank surface (13b) and a third inner flank surface (13c) on the other hand. ２ Regarding r ２ = 0.15 - 0.29 R, preferably r ２ = 0.17 - 0.27 R, more preferably r ２ Friction ring (100) according to claim 4, wherein:

11. Each of the fixing elements (11) has a radial length R and a radius of curvature r of a third corner portion (14c) between the second inner flank surface (13b) and the third inner flank surface (13c). ４ Regarding r ４ = 0.10 - 0.28 R, preferably r ４ = 0.14 - 0.24 R, most preferably r ４ Friction ring (100) according to claim 4, wherein:

12. Each of the fixing elements (11) has a radial length R and each of the convex flank surfaces (13b, 13c) has a radius of curvature r ３ Regarding r ３ = 0.5 - 1.00 R, preferably r ３ = 0.7 - 0.8 R, most preferably r ３ Friction ring (100) according to claim 5, wherein R = 0.72 - 0.75 · R applies.

13. Friction ring (100) according to any one of claims 1 to 12, wherein at least one, preferably two and very particularly preferably three radial centering grooves are arranged in the rear face (10), said centering grooves being configured for the insertion and guiding of sliding blocks for centering the friction ring during thermal expansion.

14. Friction ring (100) according to any one of the preceding claims, wherein at least one cooling element (16), in particular a cooling fin, preferably extending radially outwardly, is arranged on the rear face (10).

15. Friction ring (100) according to any one of the preceding claims, wherein at least one recirculating element (17), in particular of rounded design, is arranged on said rear face (10).

16. Friction ring (100) according to claim 14, wherein at least one cooling element (16) and / or at least one circulation element (17) are associated with each fixed element (11).

17. Friction ring (100) according to any one of claims 1 to 12, wherein the friction ring (100) comprises a plurality of friction ring segments (20a, 20b, 20c, 20d).

18. Friction ring (100) according to claim 17, wherein the friction ring segments (20a, 20b, 20c, 20d) are connected to one another by connecting elements, in particular by connecting bolts (21).

19. Friction ring (100) according to any one of the preceding claims, wherein at least one of the fixing elements (11) comprises a through hole (18) or a blind hole (19) passing through the friction ring (100).

20. 19. The friction ring (100) of claim 18, wherein each of the fixing elements (11) comprises either a through hole (18) or a blind hole (19) passing through the friction ring (100), and when viewed in the circumferential direction of the friction ring (100), the fixing elements (11) having the through hole (18) and the fixing elements (11) having the blind hole (19) alternate.

21. A track wheel of a track vehicle, comprising at least one, preferably two, friction rings (100) according to any one of claims 1 to 12.

22. 22. A track vehicle comprising at least one track wheel according to claim 21.

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