Arrangement of an axle-mounted brake disk on a hub

Abstract

The invention relates to an arrangement of an axle-mounted brake disk (1), in particular of a rail vehicle, on a hub (3) which can be rotated about an axis of rotation (AR), wherein: the axle-mounted brake disk (1) comprises a friction disk (2) having at least one friction surface plane (21, 22) with connection lugs (4) arranged on an inner circumference; the friction disk (2) is fastened to a hub flange (31) of the hub (3) by means of connection elements (5) guided through the connection lugs (4); in order to axially clamp the friction disk (2) to the hub flange (31), a neck (52) of each of the connection elements (5), said neck adjoining a collar (51), is guided through a spacing element (6) contactlessly accommodated in a bore (41) in the associated connection lug (4) of the friction disk (2) and is screwed to the hub flange (31) and, in order to clamp the friction disk (2) such that it can slide radially, the neck (52) of each of the connection elements, said neck adjoining the collar (51), extends through at least one clamping element (7) arranged between the collar (51) and the connection lug (4) of the friction disk (2), for the purpose of establishing a frictional connection between the connection lug (4) of the friction disk (2) and the hub flange (31).

Description

[0001] 2023PF00284 December 13, 2024

[0002] Knorr-Bremse Systems for Rail Vehicles GmbH

[0003] DESCRIPTION

[0004] Arrangement of a wave brake disc on a hub

[0005] The present invention relates to an arrangement of a wave brake disc, in particular of a rail vehicle, on a hub rotatable about an axis of rotation according to the preamble of claim 1.

[0006] Generic arrangements of wave brake discs on a hub, in particular of a rail vehicle, are known, for example, from DE 10 2008 033 742 A1.

[0007] Such wave brake discs for rail vehicles typically have a flange connection between the wave brake disc and the hub.

[0008] The flange connection is typically designed as a bolted connection. An axial clamping force acts on the head side of a flange on the hub and on the nut side of a clamping ring, from which it is initially transferred to a connecting tab that extends radially inwards from a friction disc of the shaft brake disc. From there, the clamping force is then transferred back to the hub flange.

[0009] Such a clamping ring acts as a positionally stable support for the nuts of the screw connections relative to the hub flange, in order to prevent the radial movements of the connecting tabs of the shaft brake disc due to thermal expansion, which occur due to the strong temperature increases during a braking process, from acting on the screws.

[0010] To achieve similarly good dimensional and diameter stability as the hub flange, such a clamping ring must have a considerable minimum axial thickness. This necessitates that the bolts used, which also extend axially (i.e., axially to the axis of rotation of the brake disc), must be very long. It is also known, for example from DE 10 2019 118 296 A1, to use so-called stretch bolts to increase the dynamic strength of the bolted connections.

[0011] The object of the present invention is to create an arrangement of a wave brake disc on a hub, with which secure fastening is possible even without the clamping ring.

[0012] The problem is solved by arranging a wave brake disc on a hub with the features of claim 1.

[0013] The arrangement according to the invention of a wave brake disc, in particular of a rail vehicle, on a hub rotatable about an axis of rotation is designed such that the wave brake disc has a friction disc with at least one friction surface plane and two flange surfaces running parallel to each other for axial attachment to a hub flange of the hub.

[0014] The friction disc is connected to the hub flange via several connecting elements with play for axial clamping.

[0015] The axial movement of the friction disc relative to the hub flange is limited by clamping elements.

[0016] This allows, on the one hand, the omission of the clamping ring and, on the other hand, the omission of the screw nuts, thus significantly reducing the axial length of the connecting elements used.

[0017] Advantageous embodiments of the invention are the subject of the dependent claims.

[0018] According to an advantageous embodiment, the friction disc has connecting tabs arranged on its inner circumference, each connecting element having a collar with a neck adjoining the collar, which is guided without contact through a bore in the respective connecting tab of the friction disc. In a preferred further development, the neck of each connecting element is guided by a spacer element that is received without contact in the bore of the respective connecting tab of the friction disc.

[0019] According to another preferred embodiment, at least one clamping element, encompassing the neck of the connecting element, is arranged between the collar and the connecting tab of the friction disc for radially sliding clamping of the friction disc with the hub flange, to create a friction-fit connection between the connecting tab of the friction disc and the hub flange.

[0020] According to one design variant, the connecting elements are designed as stud bolts.

[0021] To fix the connecting elements to the hub flange, they can be riveted, welded, glued, soldered, especially hard-soldered, or screwed into a threaded hole in the hub flange.

[0022] According to an advantageous further development, a spacer ring is arranged between the collar and the at least one clamping element, wherein a surface of the spacer ring facing away from the collar rests against an end face of the spacer element.

[0023] The use of such a spacer ring has the advantage that the force distribution is reliably distributed from the collar to the spacer element and at least one clamping element.

[0024] According to a further advantageous embodiment, the spacer element is passed through an opening in the at least one clamping element, which provides for a partial decoupling of the axial movement of the connecting element from the at least one clamping element, so that the clamping effect of the at least one clamping element only takes effect from an axial position of the connecting element shortly before reaching the end position in the hub flange.

[0025] In the case of a connecting element secured to the hub flange by bolting, the clamping effect of the at least one clamping element only takes effect when the connecting element is in an axial position shortly before reaching its maximum screw-in depth into the hub flange. According to an advantageous embodiment, the spacer element is designed as a sleeve.

[0026] The neck is preferably guided by several clamping elements.

[0027] Furthermore, at least one clamping element is preferably designed as a clamping disc ring.

[0028] According to a further preferred embodiment, the clamping force of the at least one clamping element is designed such that, in a state of tension on the friction disc at the hub flange by the connecting elements, between 50% and 95% of the preload force acts on the spacer element and the remainder acts via the at least one clamping element on the connecting tabs of the friction disc for a friction-fit connection of the connecting tabs of the friction disc with the hub flange.

[0029] According to another advantageous embodiment, the ends of the connecting elements, viewed axially from the connecting tabs to the direction of the axis of rotation, do not protrude beyond at least one friction surface plane in the assembled state.

[0030] Such an arrangement has the particular advantage that the shorter connecting elements avoid protruding ends above the friction surface planes of the friction disc, in order to further maximize axle movements in the bogie of a rail vehicle.

[0031] Following a further advantageous development, the spacer element is formed as a single piece with the connecting element to simplify assembly.

[0032] Preferred embodiments are explained in more detail below with reference to the accompanying drawings.

[0033] They show:

[0034] Figure 1 shows a schematic isometric view of an embodiment of a wave brake disc according to the invention, Figure 2 shows an isometric sectional view of a connection area between hub and friction disc to illustrate the connection between hub flange and connecting tab of the friction disc,

[0035] Figure 3 is a cutaway top view of the section shown in Figure 2.

[0036] Figure 4 shows a top view corresponding to Figure 3 of an alternative variant of the connection between the hub flange and the connecting tab of the friction disc with a connecting and spacer element combined into one component.

[0037] Figure 5 shows an isometric sectional view of another embodiment of the connection between the hub flange and the connecting tab of the friction disc with a connecting element screwed into the hub flange, and

[0038] Figure 6 shows a top view corresponding to Figure 3 of another variant of the connection between hub flange and connecting tab of the friction disc with a connecting element screwed into the spacer element.

[0039] In the following figure descriptions, terms such as top, bottom, left, right, front, back, etc., refer exclusively to the exemplary representation and position of the wave brake disc, friction disc, connecting tab, hub, hub flange, connecting element, and the like as chosen in the respective figures. These terms are not to be understood as restrictive; that is, these references may change due to different working positions, mirror-symmetrical design, or similar factors.

[0040] In Figure 1, reference numeral 1 denotes one embodiment of a wave brake disc according to the invention. Wave brake disc 1 is particularly suitable for rail vehicles.

[0041] The wave brake disc 1 has a friction disc 2 with at least one friction surface 21, 22, and in the illustrated embodiment with two friction surface 21, 22. Connecting lugs 4 are arranged on an inner circumference of the friction disc 2, in particular integrally formed, and are attached to a hub flange 31 of a hub 3 by means of connecting elements 5 guided through the connecting lugs 4. As can be clearly seen in Figures 2 to 6, the ends of the connecting elements 5, viewed axially from the connecting lugs 4 to the direction of a rotation axis AR of the hub 3, are dimensioned in length such that they do not protrude beyond the at least one friction surface 21, 22 in the assembled state.

[0042] As further shown in Figures 2 and 3, each of the connecting elements 5 for axial clamping of the friction disc 2 with a neck 52 adjoining a collar 51 is guided with play by at least one clamping disc ring 7 and a spacer element 6 received in a bore 41 of the respective connecting tab 4.

[0043] A section of the connecting element 5 spaced apart from the collar 51 is attached to the hub flange 31 of the hub 3.

[0044] In the embodiment shown in Figures 2 and 3, the connecting element 5 is designed as a stud bolt which is riveted to the hub flange 31.

[0045] The connecting elements 5 can also be welded, glued, soldered, in particular hard-soldered, or, as shown in Figures 4 and 5, screwed into a threaded bore 32 in the hub flange 31.

[0046] It is also conceivable, as shown by way of example in Figure 6, that the connecting elements 5 are screwed into a threaded bore 62 in a spacer element 6 provided with a collar 61.

[0047] The introduction of such a threaded bore 32 in the hub flange 31 of the hub 3 has the advantage that the connecting element 5 does not have to be fixed via a separate screw nut and thus the screw length can be reduced at least by the thickness of such a screw nut.

[0048] As further shown in Figures 2 to 6, several such clamping disc rings 7 are preferably provided. Furthermore, a washer ring 8 is preferably arranged between the collar 51 and the at least one clamping disc 7, as shown by way of example in Figure 5.

[0049] The surface of the support ring 8 facing away from the collar 51 rests against an end face of the spacer element 6.

[0050] The spacer element 6 is preferably designed as a sleeve.

[0051] In the embodiment shown in Figures 2, 3, 5 and 6, the spacer element 6 is longer in its axial length (in the direction of the axis of rotation AR) than the axial thickness of the connecting tabs 4.

[0052] In the embodiment shown in Figure 4, the connecting element 5 and the spacer element 6 are designed as a single component, here also referred to as connecting element 5.

[0053] In this embodiment, a threadless neck 52 extends from a collar 51 of the connecting element 5, with a diameter equal to that of the otherwise separate spacer element 6, and a threaded neck 54 extends from this threadless neck 52, with a diameter smaller relative to the neck 52, which can be screwed into the threaded bore 32 in the hub flange 31.

[0054] The clamping elements 7, which are preferably designed as clamping disc rings, are, as can be clearly seen in Figures 2 to 5, placed over the end of the spacer element 6 near the collar 51.

[0055] Likewise, the neck 52, in which the spacer element 6 is received, is passed through the clamping elements 7.

[0056] In the embodiment shown in Figure 6, the clamping elements 7 are pressed axially against the connecting tabs by the collar 61. The collar 51 of the connecting elements 5 rests against the hub flange 31 of the hub 3.

[0057] After the connecting elements 5 are fastened to the hub flange 31, the clamping force acts from the collar 51 via the washer 8 or directly in such a way that the clamping disc rings 7 are pressed together between a side of the washer 8 facing away from the collar 51 and a first end face 42 of the respective connecting plane 4, until an end face of the spacer element 6 facing away from the collar 51 or the washer 8 abuts an end face 33 of the hub flange 31.

[0058] The clamping force of at least one clamping disc ring 7 or of several clamping disc rings 7 is preferably designed such that, in a state of clamping of the friction disc 2 on the hub flange 31 by the connecting elements 5, between 50% and 95% of the preload force of the connecting elements 5 acts on the spacer element 6.

[0059] The remainder of the clamping force acts via the at least one clamping disc ring 7 on the connecting tabs 4 of the friction disc 2 to create a friction-fit connection between the connecting tabs 4 of the friction disc 2 and the hub flange 31.

[0060] In order to further protect the connecting elements 5 from the effects of thermal expansion of the friction disc 2, which occurs due to the temperatures during a braking process, the bore 41 in the connecting tabs 4 is dimensioned such that a clearance remains between an outer wall of the spacer elements 6 or, in the case of the embodiment shown in Figure 4, the outer wall of the connecting elements 5 and the inner wall of the bores 41, so that the radial thermal expansion of the friction disc 2 does not affect the connecting elements 5.

[0061] Overall, the measures described above make it possible to avoid the need for a clamping ring to protect the connecting elements 5 against bending forces due to thermal expansion or movements due to accelerations of the friction disc 2.

[0062] This makes it possible to design the axial length of these connecting elements 5 to be shorter than is the case with screws in the prior art. Reference list

[0063] 1 wave brake disc

[0064] 2 friction discs

[0065] 21 Friction surface plane

[0066] 22 Friction surface plane

[0067] 23 cooling fins

[0068] 24 spaces

[0069] 3 hub

[0070] 31 Hub flange

[0071] 32 bore

[0072] 33 Front surface

[0073] 34 Fitting opening

[0074] 4 connecting tabs

[0075] 41 bore

[0076] 42 first front surface

[0077] 43 second front face

[0078] 44 Plant area

[0079] 5 connecting elements

[0080] 51 Federal

[0081] 52 neck

[0082] 53 rivets

[0083] 54 threaded neck

[0084] 6 spacer element

[0085] 61 Federal Government

[0086] 62 Threaded hole 7 Clamping element

[0087] 8 washer

[0088] AR Rotation Axis

Claims

Claims 1. Arrangement of a wave brake disc (1), in particular of a rail vehicle, on a hub (3) rotatable about an axis of rotation (AR), wherein the wave brake disc (1) has a friction disc (2) with at least one friction surface plane (21, 22) and two flange surfaces parallel to each other for axial attachment to a hub flange (31) of the hub (3), characterized in that the friction disc (2) is connected to the hub flange (31) with play via several connecting elements (5) for axial clamping on the hub flange (31), wherein the axial mobility of the friction disc (2) relative to the hub flange (31) is limited by clamping elements (7).

2. Arrangement according to claim 1, characterized in that the friction disc (2) has connecting tabs (4) arranged on its inner circumference, wherein each of the connecting elements (5) has a collar (51) with a neck (52) adjoining the collar (51), which is guided without contact through a bore (41) of the respective connecting tab (4) of the friction disc (2).

3. Arrangement according to claim 2, characterized in that the neck (52) of each of the connecting elements (5) is guided by a spacer element (6) which is received without contact in the bore (41) of the respective connecting tab (4) of the friction disc (2).

4. Arrangement according to one of the preceding claims, characterized in that the at least one clamping element (7) encompassing the neck (52) of the connecting element (5) is arranged between the collar (51) and the connecting tab (4) of the friction disc (2) for radially sliding clamping of the friction disc (2) with the hub flange (31), to create a friction-fit connection between the connecting tab (4) of the friction disc (2) and the hub flange (31).

5. Arrangement according to one of the preceding claims, characterized in that each of the connecting elements (5) is designed as a stud bolt.

6. Arrangement according to one of the preceding claims, characterized in that each of the connecting elements (5) is riveted, welded, glued, soldered or screwed into a threaded bore (32) in the hub flange (31).

7. Arrangement according to one of the preceding claims, characterized in that a spacer ring (8) is arranged between the collar (51) and the at least one clamping element (7), wherein a surface of the spacer ring (8) facing away from the collar (51) rests against an end face of the spacer element (6).

8. Arrangement according to one of the preceding claims, characterized in that the spacer element (6) is passed through an opening of the at least one clamping element (7).

9. Arrangement according to one of the preceding claims, characterized in that the spacer element (6) is designed as a sleeve.

10. Arrangement according to one of the preceding claims, characterized in that the neck (52) is passed through several clamping elements (7).

11. Arrangement according to one of the preceding claims, characterized in that the at least one clamping element (7) is designed as a clamping disc ring.

12. Arrangement according to one of the preceding claims, characterized in that, in a state of tension of the friction disc (2) on the hub flange (31) by the connecting elements (5), between 50% and 95% of the preload force acts on the spacer element (6) and the remainder acts via the at least one clamping element (7) on the connecting tabs (4) of the friction disc (2) for a friction-fit connection of the connecting tabs (4) of the friction disc (2) with the hub flange (31).

13. Arrangement according to one of the preceding claims, characterized in that the ends of the connecting elements (5), viewed from the attachments, The end tabs (4) extend axially to the direction of the axis of rotation (AR) and, in the assembled state, do not project beyond the at least one friction surface plane (21, 22).

14. Arrangement according to one of the preceding claims, characterized in that the spacer element (6) is formed integrally with the connecting element (5).

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