CN118088602A

CN118088602A - Brake pad, disc brake device and rail vehicle

Info

Publication number: CN118088602A
Application number: CN202211433039.3A
Authority: CN
Inventors: 高思远; 朱松; 刘晓军; 翟财周; 谢鑫林
Original assignee: CRRC Qishuyan Institute Co Ltd; CRRC Changzhou Tech Mark Industrial Co Ltd
Current assignee: CRRC Qishuyan Institute Co Ltd; CRRC Changzhou Tech Mark Industrial Co Ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2024-05-28

Abstract

The application provides a brake pad, a disc brake device and a railway vehicle. The brake pad includes: a brake pad substrate provided with a plurality of mounting holes arranged at intervals; a plurality of friction bodies floatably mounted to the shutter base plate at intervals via a plurality of mounting holes, respectively; the gaps between the friction bodies form one or more first channels for removing dust and/or dissipating heat along the braking friction direction of the braking pads and the braking disc of the rail vehicle, and form one or more second channels for removing dust and/or dissipating heat along the longitudinal direction of the rail vehicle. According to the technical scheme, through the arrangement of the staggered and through chip removal and heat dissipation network, the chip removal and heat dissipation performance is remarkably improved, the friction and heat loss of the brake pads are reduced, the attenuation of the braking friction coefficient is slowed down, the friction braking effect between the brake pads and the brake disc is further ensured, and the running safety of the rail train is ensured.

Description

Brake pad, disc brake device and rail vehicle

Technical Field

The application relates to the field of railway vehicle braking, and relates to a brake pad, a disc brake device comprising the brake pad and a railway vehicle comprising the disc brake device.

Background

The existing rail vehicles mostly adopt a disc brake technology, and a disc brake device mainly comprises a brake disc, a brake pad and a brake caliper. The brake pad is one of key parts of disc brake, and when the railway vehicle brakes, the brake pad is contacted with the brake disc through braking force transmitted by the calipers, and kinetic energy is absorbed through relative friction, so that the railway vehicle is decelerated and stopped. A large amount of frictional heat and wear debris are generated during braking. The existing braking device has the problems of eccentric wear, metal mosaic, high local temperature and the like in the braking process, and the defects of abrasion blocks of the braking pad, poor braking effect, short service life and the like caused by the problems.

Disclosure of Invention

The present application aims to provide a brake pad, a disc brake device comprising said brake pad and a railway vehicle comprising said disc brake device, to solve or alleviate at least part of the problems mentioned in the background art.

To achieve one of the foregoing objects, according to one aspect of the present application, there is provided a brake pad for a railway vehicle, comprising: a brake pad substrate provided with a plurality of mounting holes arranged at intervals; a plurality of friction bodies floatably mounted to the shutter base plate at intervals via the plurality of mounting holes, respectively; the gaps between the friction bodies form one or more first channels for removing dust and/or radiating heat along the braking friction direction of the braking brake pad and the braking disc of the railway vehicle, and form one or more second channels for removing dust and/or radiating heat along the longitudinal direction of the railway vehicle.

In addition to, or as an alternative to, one or more of the features described above, in further embodiments the first channel is configured as an arcuate channel and the second channel is configured as a "in-line" channel.

In addition to or as an alternative to one or more of the above features, in further embodiments the friction body includes a mounting pin body floatably mounted into the mounting hole and a friction block fixedly connected to the mounting pin body.

In addition to or as an alternative to one or more of the above features, in a further embodiment the mounting pin body comprises a connecting plate for connecting the friction blocks, a curved transition protruding from the connecting plate in a direction away from the friction blocks, and a pin protruding from the transition in a direction away from the friction blocks.

In addition to or as an alternative to one or more of the above features, in a further embodiment, the mounting hole includes a first mounting groove provided at a side of the shutter base plate facing the plurality of friction bodies, a second mounting groove provided at a side of the shutter base plate facing away from the plurality of friction bodies, and a transition hole provided between and communicating the first and second mounting grooves.

In addition to or as an alternative to one or more of the above features, in a further embodiment the first mounting groove is configured cylindrically, the transition portion being floatably connected to the first mounting groove via a first elastic element.

In addition to or as an alternative to one or more of the above features, in a further embodiment the first resilient element is a belleville spring arranged in the first mounting groove, the transition portion being provided with a clamping portion near the connecting plate, the belleville spring being clamped to the clamping portion.

In addition to or as an alternative to one or more of the above features, in a further embodiment the transition hole comprises a curved recess recessed from the first mounting groove towards the second mounting groove, the curved recess having a contour matching a contour of the transition portion, a portion of the transition portion adjacent to the pin being floatably received in the curved recess.

In addition to or as an alternative to one or more of the above features, in a further embodiment the transition aperture further comprises a cylindrical portion disposed between the curved recess and the second mounting groove, a portion of the pin proximate the transition portion being floatably received in the cylindrical portion.

In addition to or as an alternative to one or more of the above features, in a further embodiment the pin is floatably retained to the second mounting groove via a second resilient element.

In addition to one or more of the above features, or as an alternative, in a further embodiment, the pin includes an annular groove provided along a circumferential side thereof, and the second elastic member is configured as an annular clip that is snapped into the annular groove and clamps the pin along at least a portion of its circumference, the annular clip abutting against a surface of the second mounting groove in a thickness direction of the shutter base plate to floatably limit the pin to the second mounting groove.

In addition to or as an alternative to one or more of the above features, in a further embodiment, the brake lining base plate is provided with a limit bump located between two adjacent friction bodies, the limit bump having a gap with the two adjacent friction bodies.

In addition to or as an alternative to one or more of the above features, in further embodiments the outer contour of the friction block is configured as a polygon with a transition contour.

In addition to or as an alternative to one or more of the above features, in a further embodiment the outer contour of the friction block is configured as a quadrilateral having a transition contour comprising a transition edge connecting two adjacent edges of the quadrilateral, the transition edge comprising a straight section and an arcuate section located between the straight section and the two adjacent edges.

To achieve one of the foregoing objects, according to another aspect of the present application, there is provided a disc brake device comprising: a brake pad as claimed in any one of the preceding aspects, and a brake disc with which the brake pad can be brought into contact for friction braking.

To achieve one of the foregoing objects, according to another aspect of the present application, there is provided a railway vehicle comprising a disc brake device as described above.

According to the brake pad, the disc brake device comprising the brake pad and the railway vehicle comprising the disc brake device, through the arrangement of the staggered and through chip removal and heat dissipation network formed by the one or more first channels and the one or more second channels, the efficiency of discharging friction fragments of the brake pad and the timeliness and effectiveness of heat dissipation are remarkably improved, the friction and heat loss of the brake pad are reduced, the attenuation of a braking friction coefficient is slowed down, the service life of the brake pad is prolonged, the friction braking effect between the brake pad and a brake disc is further ensured, and the running safety of a railway train is ensured.

Drawings

The present disclosure will be more readily understood with reference to the accompanying drawings. It is to be understood that these drawings are solely for purposes of illustration and are not intended as a definition of the limits of the application. In the figure:

Fig. 1 is a schematic front view of a brake pad 1 according to an embodiment of the present application;

Fig. 2 is a schematic rear view of the brake pad 1 in fig. 1;

FIG. 3 shows a schematic structural view of a friction body according to an embodiment of the present application;

FIG. 4 illustrates a schematic cross-sectional view of a brake pad substrate according to one embodiment of the present application;

FIG. 5 shows a cross-sectional view at A-A in FIG. 1;

FIG. 6 shows a cross-sectional view at B-B in FIG. 1; and

Fig. 7 shows a schematic view of the outer contour of the friction block in fig. 1.

Detailed Description

The application will be described in detail hereinafter with reference to exemplary embodiments in the accompanying drawings. It should be understood, however, that this application may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the application to those skilled in the art.

Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the drawings, it is easy for a person skilled in the art to proceed with appropriate combination or deletion between these technical features (or equivalents thereof), thereby obtaining still further embodiments of the application that may not be directly mentioned herein, without departing from the technical scope of the application.

Fig. 1 is a schematic front view of a brake pad 1 according to an embodiment of the present application, and fig. 2 is a schematic rear view of the brake pad 1 in fig. 1. The brake pad 1 is used for a brake device mounted on a railway vehicle, and brakes the railway vehicle by friction against a brake disc. As can be seen from fig. 1 and 2, the brake pad 1 includes: a shutter base plate 100 on which a plurality of mounting holes 110 are provided to be arranged at intervals; and a plurality of friction bodies 200, the plurality of friction bodies 200 being mounted to the brake pad substrate 100 via the plurality of mounting holes 110, respectively, at intervals. The friction body 200 is in floating connection with the mounting hole 110 through an elastic element, so that the friction body can elastically float relative to the brake pad substrate 100 along the thickness direction of the brake pad substrate 100 (i.e. the direction perpendicular to the paper surface in fig. 1 or 2), thereby realizing self-adaptive adjustment of the brake pad 1, ensuring effective friction between the friction body 200 and the brake disc, and reducing eccentric wear.

Based on the spaced arrangement of the plurality of friction bodies 200, the gaps between the plurality of friction bodies 200 form one or more first passages 10 for removing chips and/or heat along the braking friction direction of the brake pad 1 and the brake disc of the railway vehicle, for example, in the embodiment shown in fig. 1, two substantially arc-shaped first passages 10 (schematically shown in dotted lines) are formed along the bending direction of the pad substrate 100, so that chips of the friction bodies 200 which are rubbed down along the braking friction direction can be smoothly discharged, and timely heat dissipation is facilitated. In addition, the gaps between the plurality of friction bodies 200 also form one or more second passages 20 (three of which are schematically indicated by dash-dot lines in fig. 1 for clarity of indication) for removing chips and/or radiating heat along the longitudinal direction of the rail vehicle (i.e., up-down direction in the drawing), i.e., when the brake pad 1 is mounted on the rail vehicle, the second passages 20 are aligned with the running direction of the rail vehicle, and air flows through the second passages 20 to blow out chips and remove friction heat during running of the vehicle, thereby effectively improving chip removal and heat radiation effects of the brake pad 1. In other embodiments, more or less first and second channels than in fig. 1 may be formed depending on the number and manner of arrangement of the friction blocks.

With this arrangement, the brake pad described herein realizes a network of staggered through chip removal and heat dissipation formed by one or more first channels and one or more second channels, thereby effectively improving the chip removal and heat dissipation performance of the brake pad, reducing the friction and heat loss of the brake pad, slowing down the attenuation of the braking friction coefficient, ensuring the friction braking effect between the brake pad and the brake disc, and prolonging the service life of the brake pad.

Further implementations or refinements, improvements relating to the brake pads will be described below by way of exemplary illustration in order to further improve their operating efficiency, reliability or other improvements.

Fig. 3 shows a schematic structural view of a friction body 200 according to an embodiment of the present application. As shown in fig. 3, the friction body 200 includes a mounting pin body 210 and a friction block 220 fixedly coupled to the mounting pin body 210, the mounting pin body 210 being floatably mounted in the mounting hole 110. Specifically, the mounting pin body 210 includes a connection plate for connecting the friction block 220, a curved transition portion 212 protruding from the connection plate in a direction away from the friction block 220 (i.e., downward in the drawing), and a pin 213 protruding from the transition portion 212 in a direction away from the friction block 220. The friction block 220 may be composed of powder metallurgy friction particles and fixedly connected to the connection plate by sintering.

Fig. 4 shows a schematic cross-sectional view of the shim substrate 100 according to an embodiment of the present application, and it can be seen that the mounting hole 110 on the shim substrate 100 includes a first mounting groove 111 provided at a side (upward side in the drawing) of the shim substrate 100 facing the plurality of friction bodies 200, a second mounting groove 112 provided at a side of the shim substrate 100 facing away from the plurality of friction bodies 200, and a transition hole 113 provided between and communicating the first and second mounting grooves 111 and 112.

In the embodiment of fig. 4, the first and second mounting grooves 111 and 112 may be configured as cylindrical grooves; the transition hole 113 includes a curved concave portion 1131 recessed from the first mounting groove 111 toward the second mounting groove 112, the contour of the curved concave portion 1131 matching the contour of the transition 212 of the mounting pin body 210, and a portion of the transition 212 near the pin 213 (i.e., a lower portion in the drawing) is floatably accommodated in the curved concave portion 1131 at the time of mounting. In the embodiment shown in fig. 3 and 4, the transition portion 212 is configured as a segment, the curved recess 1131 is configured as a mating segment recess, so that when the friction body 200 floats up and down along the thickness direction of the brake pad substrate 100, the transition portion 212 is in smooth contact with the curved recess 1131, impact damage is reduced, the mounting pin body 210 and the mounting hole 110 are effectively protected, and further, the service life of the brake pad 1 is prolonged. In addition, the transition hole 113 may further include a cylindrical portion 1132 disposed between the curved recess 1131 and the second mounting groove 112, thereby avoiding a sharp transition formed when the curved recess 1131 is directly connected to the second mounting groove 112, reducing stress concentration, and increasing structural strength, and a portion of the pin 213 adjacent to the transition portion 212 is floatably accommodated in the cylindrical portion 1132.

Fig. 5 shows a cross-sectional view at A-A in fig. 1, fig. 6 shows a cross-sectional view at B-B in fig. 1, and the connection and mating relationship between the friction body 200 and the brake shoe 100 can be seen in more detail in connection with fig. 5 and 6. For example, the first mounting groove 111 may be configured cylindrically, the transition 212 of the mounting pin body 210 being floatably connected to the first mounting groove 111 via a first elastic element. In the embodiment shown in fig. 5, a portion of the transition portion 212 near the connection plate may be provided with a catching portion 2121 having a stepped cross section, and the first elastic member may be a belleville spring 410 provided in the first mounting groove 111, and the belleville spring 410 is caught to the catching portion 2121 so that the friction body 200 may elastically float in the thickness direction of the shim substrate 100.

On this basis, the pin 213 is floatably retained to the second mounting groove 112 via the second elastic member. Specifically, the pin 213 may include an annular groove 2131 provided along a circumferential side portion thereof, the second elastic member is configured to have an open annular snap spring 420 (see fig. 2), the annular snap spring 420 is snapped into the annular groove 2131 and clamps at least part of the pin 213 along a circumferential direction thereof, and the annular snap spring 420 abuts against a surface of the second mounting groove 112 in a thickness direction of the shim substrate 100 to floatably restrain the pin 213 to the second mounting groove 112.

In other embodiments, the first and second mounting slots may be provided as slots of other suitable geometries, and the first and second resilient elements may be provided as other elements for resilient floating connections.

On this basis, as shown in fig. 1 and 6, the brake pad substrate 100 may be further provided with a limit bump 300 between two adjacent friction bodies 200, and according to the arrangement of the friction bodies 200 at both sides of the limit bump 300, the limit bump 300 may be provided with a trapezoid, triangle or rectangle outer contour as shown in fig. 1, wherein the side contour of the limit bump 300 near the friction body 200 is identical to (or parallel to) the side contour of the friction body 200. Therefore, when the friction body 200 deflects at a small angle, the limit bump 300 can stop the mounting pin body 210 (such as the connecting plate 211) of the friction body 200, thereby limiting the further deflection of the friction body 200, ensuring the action angle of the friction body 200 and reducing fatigue failure caused by torsion of the elastic element. In addition, as shown in fig. 6, a gap is provided between the stopper projection 300 and the adjacent two friction bodies 200 so as not to interfere with the floating of the friction bodies 200 in the thickness direction of the brake pad 1.

Fig. 7 shows a schematic view of the outer contour of the friction block 220 of fig. 1. The outer contour of the friction block 220 may be configured as a polygon having a transition contour. For example, the outer profile of the friction block 220 may be configured as a quadrilateral having a transition profile including a transition edge 221 connecting two adjacent edges of the quadrilateral, the transition edge 221 including a straight section 2211 and an arcuate section 2212 located between the straight section 2211 and the two adjacent edges. The arrangement of the transition profile can effectively reduce stress concentration on the friction block 220, reduce falling of scraps, and promote uniform heat dissipation on the friction block 220, thereby effectively improving the action effect of the friction block 220 and prolonging the service life of the friction block. In other embodiments, the transition edges may also be designed as contours of smooth transitions of other shapes.

Furthermore, although not shown in the drawings, the present application also provides a disc brake device for a railway vehicle. The disc brake device comprises a brake disc and brake pads as described in any of the embodiments described above or in any combination thereof, and thus has corresponding technical effects, which will not be described here.

Furthermore, although not shown in the drawings, the present application also provides a railway vehicle. The rail vehicle comprises the aforementioned disc brake device and thus has corresponding technical effects, which are not described here. More specifically, the rail vehicle may be a high-speed rail vehicle of 400 km/h or more. The brake pad disclosed by the application has stable braking performance and reliability in a high-speed application scene, so that the problems of damping of friction coefficient, rapid abrasion and the like of the brake pad during braking at a speed of 400 km/h or more are solved, and the phenomena of slag and block falling and the like are improved.

The above examples mainly illustrate the brake pad of the present application, the disc brake device including the brake pad, and the railway vehicle including the disc brake device. Although only a few embodiments of the present application have been described, those skilled in the art will appreciate that the present application can be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the illustrated examples and embodiments are to be considered as illustrative and not restrictive, and the application is intended to cover various modifications and substitutions without departing from the spirit and scope of the technical solutions of the application.

Claims

1. Brake pad (1) for a railway vehicle, characterized in that it comprises:

A shutter base plate (100) provided with a plurality of mounting holes (110) arranged at intervals;

a plurality of friction bodies (200), wherein the plurality of friction bodies (200) are respectively and intermittently and floatably mounted to the brake pad base plate (100) through the plurality of mounting holes (110);

The gaps between the friction bodies (200) form one or more first channels (10) for removing dust and/or dissipating heat along the braking friction direction of the braking pad (1) and the braking disc of the railway vehicle, and one or more second channels (20) for removing dust and/or dissipating heat along the longitudinal direction of the railway vehicle.

2. Brake pad (1) according to claim 1, characterized in that the first channel (10) is configured as an arcuate channel in the braking friction direction of the brake pad (1) with the brake disc of the rail vehicle, and the second channel (20) is configured as a "in-line" channel in the longitudinal direction of the rail vehicle.

3. The brake pad (1) according to claim 1, characterized in that the friction body (200) comprises a mounting pin body (210) and a friction block (220) fixedly connected to the mounting pin body (210), the mounting pin body (210) being floatably mounted into the mounting hole (110).

4. A brake pad (1) according to claim 3, characterized in that the mounting pin body (210) comprises a connection plate (211) for connecting the friction block (220), a curved transition (212) protruding from the connection plate (211) in a direction away from the friction block (220), and a pin (213) protruding from the transition (212) in a direction away from the friction block (220).

5. The brake pad (1) according to claim 4, wherein the mounting hole (110) includes a first mounting groove (111) provided at a side of the pad substrate (100) facing the plurality of friction bodies (200), a second mounting groove (112) provided at a side of the pad substrate (100) facing away from the plurality of friction bodies (200), and a transition hole (113) provided between and communicating the first mounting groove (111) and the second mounting groove (112).

6. Brake pad (1) according to claim 5, characterized in that the first mounting groove (111) is configured cylindrically, the transition portion (212) being floatably connected to the first mounting groove (111) via a first elastic element.

7. The brake pad (1) according to claim 6, characterized in that the first elastic element is a disc spring (410) provided in the first mounting groove (111), a portion of the transition portion (212) near the connecting plate (211) is provided with a clamping portion (2121), and the disc spring (410) is clamped to the clamping portion (2121).

8. Brake pad (1) according to claim 5, characterized in that the transition hole (113) comprises a curved recess (1131) recessed from the first mounting groove (111) towards the second mounting groove (112), the contour of the curved recess (1131) matching the contour of the transition (212), the portion of the transition (212) close to the pin (213) being floatably accommodated in the curved recess (1131).

9. Brake pad (1) according to claim 8, wherein the transition hole (113) further comprises a cylindrical portion (1132) provided between the curved recess (1131) and the second mounting groove (112), a portion of the pin (213) close to the transition portion (212) being floatably accommodated in the cylindrical portion (1132).

10. Brake pad (1) according to claim 9, characterized in that the pin (213) is floatably limited to the second mounting groove (112) via a second elastic element.

11. The brake pad (1) according to claim 10, characterized in that the pin (213) comprises an annular groove (2131) provided along a circumferential side thereof, the second elastic element is configured as an annular snap spring (420), the annular snap spring (420) is snapped into the annular groove (2131) and clamps at least part of the pin (213) along a circumferential direction thereof, the annular snap spring (420) abuts against a surface of the second mounting groove (112) in a thickness direction of the pad substrate (100) to floatably limit the pin (213) to the second mounting groove (112).

12. A brake pad (1) according to claim 3, characterized in that the brake pad substrate (100) is provided with a limit bump (300) located between two adjacent friction bodies (200), and a gap is provided between the limit bump (300) and the two adjacent friction bodies (200).

13. A brake pad (1) according to claim 3, characterized in that the outer contour of the friction block (220) is configured as a polygon with a transitional contour.

14. The brake pad (1) according to claim 13, characterized in that the outer contour of the friction block (220) is configured as a quadrilateral with a transition contour, the transition contour comprising a transition edge (221) connecting two adjacent edges of the quadrilateral, the transition edge (221) comprising a straight section (2211) and an arc section (2212) located between the straight section (2211) and the two adjacent edges.

15. A disc brake device, comprising: brake pad (1) according to any one of claims 1-14, and a brake disc with which the brake pad (1) can be brought into contact for friction braking.

16. A rail vehicle, characterized by comprising a disc brake device according to claim 15.