Wheel-mounted brake disc

Abstract

The wheel-mounted brake disc comprises two disc bodies, the two disc bodies are symmetrically arranged on the two sides of a wheel spoke plate and connected with the wheel spoke plate through a plurality of connecting structures, and a heat dissipation cavity is formed between the inner disc face of each disc body and the wheel spoke plate; wherein a plurality of radiating ribs and a plurality of mounting bosses for mounting connecting structures are distributed on the inner disc surface of the disc body along the circumferential direction of the disc body; the distance between the inner disc face and the outer disc face of the disc body is H1, the protruding heights of the installation bosses and the radiating ribs relative to the inner disc face of the disc body are H2, and H1 / H2 is larger than or equal to 1.5 and smaller than or equal to 1.6. According to the wheel-mounted brake disc, the proportional relation between the distance H1 and the height H1 is reasonably set, so that the heat capacity of the disc body is increased while it is guaranteed that the structural strength meets the requirement, product failure caused by high temperature in the application process of the disc body is avoided, and the brake power can meet the application requirement of an urban motor train unit with the running speed reaching 160 km / h.

Description

Technical Field

[0001] The invention relates to the technical field of rail vehicle braking, and in particular to a wheel-mounted brake disc. Background Art

[0002] As a form of transportation that transitions and integrates urban rail transit and trunk railways, urban rail has been vigorously developed in urban areas. The operating speed of urban EMUs has gradually increased from 120km / h to 160km / h, which has put forward higher requirements on the braking power of the braking system. At the same time, the lightweighting of the braking system has also received widespread attention. In particular, the brake disc, as a rotating component, has a more obvious weight reduction and energy saving effect after being replaced with new materials than other components.

[0003] SiC particle reinforced aluminum-based materials have the characteristics of low density, high specific stiffness and specific strength, low thermal expansion coefficient, good plastic processing properties, etc., and are the preferred materials for preparing lightweight wheel-mounted brake discs. However, the braking power and lightweight of brake discs are an irreconcilable contradiction. The brake power of wheel-mounted brake discs made of SiC particle reinforced aluminum-based materials in the prior art is only suitable for urban rail trains and fast freight cars running at speeds below 140km / h, but cannot meet the operating requirements of urban EMUs running at speeds of 160km / h, especially the friction surface temperature is likely to exceed the performance limit of the material.

[0004] Therefore, in order to increase the maximum applicable operating speed of the brake disc, the structural design of the brake disc needs to be further improved. Summary of the invention

[0005] The purpose of the present invention is to provide a wheel-mounted brake disc to solve the technical problem that the braking power of the existing lightweight wheel-mounted brake disc cannot meet the operating requirements of an urban EMU with a running speed of 160 km / h.

[0006] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0007] The present invention provides a wheel-mounted brake disc, comprising two disc bodies, which are symmetrically arranged on both sides of a wheel spoke plate and connected to the wheel spoke plate through a plurality of connecting structures, and a heat dissipation cavity is formed between the inner disc surface of the disc body and the wheel spoke plate; wherein, a plurality of heat dissipation ribs and a plurality of mounting bosses for mounting the connecting structures are distributed on the inner disc surface of the disc body along the circumference of the disc body; the spacing between the inner disc surface and the outer disc surface of the disc body is H1, and the heights of the mounting bosses and the heat dissipation ribs protruding relative to the inner disc surface of the disc body are both H2, and have the relationship: 1.5≤H1 / H2≤1.6.

[0008] In an embodiment of the present invention, the material of the disk body is SiC particle reinforced aluminum alloy material.

[0009] In an embodiment of the present invention, the outer contour of the mounting boss is a rhombus with rounded corners, the rhombus has a first diagonal and a second diagonal perpendicular to each other, and the first diagonal of the rhombus extends radially along the disk body.

[0010] In an embodiment of the present invention, the length of the first diagonal line is L1, and the length of the second diagonal line is L2, and they have the relationship: 0.15≤L1 / L2≤0.2.

[0011] In an embodiment of the present invention, the radius of the two first rounded corners connected by the first diagonal line is R1, and the radius of the two second rounded corners connected by the second diagonal line is R2, and they have the relationship: 0.2≤R1 / R2≤0.4.

[0012] In an embodiment of the present invention, a plurality of the connecting structures include a plurality of fastening bolts, a plurality of the mounting bosses include a plurality of connecting bosses, the connecting bosses include a connecting protrusion and two first supporting protrusions, the connecting protrusion is provided with a bolt hole for installing the fastening bolts, the connecting protrusion is located between the two first supporting protrusions in the radial direction of the disk body, and two first heat dissipation grooves connected to the heat dissipation cavity are formed between the connecting protrusion and the two first supporting protrusions; wherein, the spacing between the bottom surface of the groove of the first heat dissipation groove and the inner disk surface of the disk body is H3; the spacing H3 and the height H2 have the relationship: 0.5≤H3 / H2≤0.7.

[0013] In an embodiment of the present invention, the plurality of heat dissipation ribs include a plurality of supporting heat dissipation ribs, and the supporting heat dissipation ribs include two second supporting protrusions, and the two second supporting protrusions are spaced apart in the radial direction of the disk body so that a second heat dissipation groove connected to the heat dissipation cavity is formed between the two second supporting protrusions; wherein the spacing between the groove bottom surface of the second heat dissipation groove and the inner disk surface of the disk body is H4; the spacing H4 and the height H2 have a relationship of: 0.5≤H4 / H2≤0.7.

[0014] In an embodiment of the present invention, three supporting heat dissipation ribs are distributed between one connecting boss and the connecting boss adjacent to one side thereof in the circumferential direction of the disk body.

[0015] In an embodiment of the present invention, the plurality of connecting structures include a plurality of positioning pins, the plurality of mounting bosses include a plurality of positioning bosses, and the positioning bosses are provided with positioning grooves for mounting the positioning pins; the plurality of heat dissipation ribs also include a plurality of short heat dissipation ribs, one end of the positioning boss close to the inner edge of the disk body is located between two of the short heat dissipation ribs in the circumferential direction of the disk body, and one end of the positioning boss close to the outer edge of the disk body is located between the other two short heat dissipation ribs in the circumferential direction of the disk body.

[0016] In an embodiment of the present invention, in the circumferential direction of the disk body, a positioning boss and four short heat dissipation ribs therearound are distributed between a connecting boss and the connecting boss adjacent to one side thereof.

[0017] The characteristics and advantages of the present invention are:

[0018] The wheel-mounted brake disc of the present invention increases the heat capacity of the disc body while ensuring that the structural strength meets the requirements by reasonably setting the ratio between the thickness of the friction ring of the disc body (that is, the distance between the inner disc surface and the outer disc surface of the disc body) and the height of the mounting boss and the heat dissipation ribs protruding relative to the inner disc surface of the disc body, thereby avoiding product failure of the disc body due to high temperature during use, so that the braking power of the wheel-mounted brake disc can meet the operation requirements of urban EMUs with a running speed of up to 160km / h. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the installation of the wheel-mounted brake disc in the present invention.

[0021] Figure 2 It is a schematic diagram of the distribution of the heat dissipation ribs and the mounting bosses on the inner disk surface of the disk body in the present invention.

[0022] Figure 3 for Figure 2 Radial cross-section of the connecting boss at AA.

[0023] Figure 4 for Figure 2 Radial cross-section of the heat dissipation ribs supporting the center BB.

[0024] Figure 5 for Figure 2 Radial cross-section of the heat dissipation ribs of the middle CC support.

[0025] Figure 6 The figure is a schematic diagram showing the relationship between the maximum temperature of the friction surface of the disc and the ratio H1 / H2 after two consecutive emergency braking at a running speed of 160 km / h.

[0026] Figure 7 The following is a graph showing the change in friction surface temperature of the disc over time after two consecutive emergency braking operations at a speed of 160 km / h.

[0027] Figure 8 Schematic diagram of the relationship between the disk weight and the ratio H1 / H2.

[0028] Fig. 9 It is a partial enlarged view of the connecting boss of the present invention.

[0029] In the figure:

[0030] 1. Wheel; 11. Wheel spoke plate;

[0031] 2. disk body; 21. friction ring; 211. inner disk surface; 212. outer disk surface; 213. mounting groove; 22. mounting boss; 221. connecting boss; 2211. connecting convex portion; 2212. first supporting convex portion; 2213. first heat dissipation groove; 2214. bolt hole; 222. positioning boss; 2221. positioning groove; 223. first diagonal line; 224. second diagonal line; 225. first fillet; 226. second fillet; 23. heat dissipation rib; 231. supporting heat dissipation rib; 2311. second supporting convex portion; 2312. second heat dissipation groove; 232. short heat dissipation rib; 24. first combined structure; 25. second combined structure;

[0032] 3. Tighten the bolts;

[0033] 4. Bolt sleeve;

[0034] 5. Nut. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1 As shown, the present invention provides a wheel-mounted brake disc, comprising two disc bodies 2, which are symmetrically arranged on both sides of a wheel spoke plate 11 and connected to the wheel spoke plate 11 through a plurality of connecting structures, and a heat dissipation cavity is formed between an inner disc surface 211 of the disc body 2 and the wheel spoke plate 11; wherein, as Figure 2 As shown, a plurality of heat dissipation ribs 23 and a plurality of mounting bosses 22 for mounting the connection structure are distributed on the inner disk surface 211 of the disk body 2 along the circumference of the disk body 2; Figures 3 to 5 As shown, the distance between the inner disk surface 211 and the outer disk surface 212 of the disk body 2 is H1, and the heights of the mounting boss 22 and the heat dissipation ribs 23 relative to the inner disk surface 211 of the disk body 2 are both H2, and the relationship is: 1.5≤H1 / H2≤1.6.

[0037] Specifically, the outer disk surface 212 of the disk body 2 is the friction surface of the disk body 2 contacting the brake pad. The portion between the outer disk surface 212 of the disk body 2 and the inner disk surface 211 of the disk body 2 can also be defined as the friction ring 21 of the disk body 2, so the spacing H1 is the thickness of the friction ring 21. The overall thickness H of the disk body 2 is equal to the sum of the spacing H1 and the height H2. Due to the limitation of the mechanical installation interface of the wheel-mounted brake disc, the overall thickness H of the disk body 2 cannot be adjusted, so it is equal to the overall thickness of the disk body 2 of the wheel-mounted brake disc in the prior art. The inner diameter and outer diameter of the disk body 2 are not specifically limited. As in a specific embodiment of the present invention, the inner diameter of the disk body 2 can be 390 mm and the outer diameter of the disk body 2 can be 680 mm; it can also be equal to the inner diameter and outer diameter of the disk body 2 of the wheel-mounted brake disc in the prior art.

[0038] The wheel-mounted brake disc of the present invention increases the heat capacity of the disc body 2 while ensuring that the structural strength meets the requirements by reasonably setting the ratio between the thickness of the friction ring 21 of the disc body 2 (that is, the distance H1 between the inner disc surface 211 and the outer disc surface 212 of the disc body 2) and the height H2 of the mounting boss 22 and the heat dissipation ribs 23 relative to the inner disc surface 211 of the disc body 2, thereby avoiding product failure of the disc body 2 due to high temperature during use, so that the braking power of the wheel-mounted brake disc can meet the operation requirements of urban EMUs with a running speed of 160km / h.

[0039] In the embodiment of the present invention, in order to achieve lightweight wheel-mounted brake disc, the material of the disc body 2 is SiC particle reinforced aluminum alloy material, and its allowable operating temperature is 300°C. When the friction surface temperature exceeds 300°C, the braking friction coefficient and material strength will change significantly and fail.

[0040] Specifically, from Figure 6 It can be seen from the figure that when H1 / H2 is less than 1.5, after two consecutive emergency brakings at a running speed of 160 km / h, the maximum temperature of the friction surface will exceed 300°C, so it is not suitable for the operating conditions of SiC particle-reinforced aluminum alloy materials at a speed of 160 km / h.

[0041] like Figure 7 As shown, in the specific embodiment of H1 / H2=1.5, using FEM analysis software, it can be obtained that after two consecutive emergency brakings at an operating speed of 160km / h, the maximum temperature of the disk surface is lower than 300 degrees Celsius, which meets the application requirements.

[0042] Since different thickness ratios will affect the weight of the wheel-mounted brake disc, the weight of the wheel-mounted brake disc is the unsprung mass of the rail vehicle, and therefore is also the design focus of the wheel-mounted brake disc. The wheel-mounted brake disc made of SiC particle reinforced aluminum alloy material in the present invention is dimensionless processed based on the weight of the wheel-mounted brake disc made of cast steel material under the same structural design. Figure 8 As shown, as the proportion of the spacing H1 increases, H1 / H2 gradually increases, and the weight of the wheel-mounted brake disc also gradually increases, which is not conducive to the lightweight design of the wheel-mounted brake disc.

[0043] Therefore, combined with Figures 6 to 8 As shown, the present invention is directed to a wheel-mounted brake disc made of SiC particle-reinforced aluminum alloy material, and optimizes the ratio between the distance H1 between the inner disc surface 211 and the outer disc surface 212 of the disc body 2 and the height H2 of the mounting boss 22 and the heat dissipation rib 23 relative to the inner disc surface 211 of the disc body 2 to: 1.5≤H1 / H2≤1.6, thereby achieving lightweight and meeting the requirements of structural strength while also increasing the heat capacity of the disc body 2, so that after two consecutive emergency brakings, the maximum temperature of the friction surface is lower than 300°C.

[0044] Preferably, H1 / H2=1.54, which can not only meet the operating requirements of rail vehicles at a speed of 160 kilometers per hour, but also ensure a good weight reduction effect. Compared with cast iron materials with the same structure, the weight can be reduced by 51.6%.

[0045] like Figure 1 and Figure 3 As shown, in the embodiment of the present invention, the plurality of connection structures include a plurality of fastening bolts 3, the plurality of mounting bosses 22 include a plurality of connecting bosses 221, and the connecting bosses 221 are provided with bolt holes 2214 for installing the fastening bolts 3. Specifically, the fastening bolts 3 are inserted into the bolt holes 2214 corresponding to the two disc bodies 2, two bolt sleeves 4 are sleeved on the fastening bolts 3, and the outer disc surfaces of the two disc bodies 2 are provided with mounting grooves 213 for accommodating the bolt sleeves 4. One end of the fastening bolt 3 is connected to the nut 5, so that the two disc bodies 2 are fastened to the two sides of the wheel spoke plate 11 of the wheel 1.

[0046] like Figure 1 , Figure 2 as well as Figure 3As shown, the connecting boss 221 includes a connecting protrusion 2211 and two first supporting protrusions 2212. The connecting protrusion 2211 is provided with a bolt hole 2214 for installing the fastening bolt 3. The connecting protrusion 2211 is located between the two first supporting protrusions 2212 in the radial direction of the disk body 2. Two first heat dissipation grooves 2213 connected to the heat dissipation cavity are formed between the connecting protrusion 2211 and the two first supporting protrusions 2212; thereby, the first heat dissipation grooves 2213 are connected to the heat dissipation cavity, so that the heat dissipation airflow can flow through the first heat dissipation grooves 2213 during braking and take away the heat of the connecting boss 221, thereby improving the thermal structure strength of the connecting boss 221 and enhancing the heat dissipation capacity of the disk body 2.

[0047] Furthermore, if Figure 2 and Figure 4 As shown, the plurality of heat dissipation ribs 23 include a plurality of supporting heat dissipation ribs 231, and the supporting heat dissipation rib 231 includes two second supporting protrusions 2311, and the two second supporting protrusions 2311 are spaced apart in the radial direction of the disk body 2 so that a second heat dissipation groove 2312 connected to the heat dissipation cavity is formed between the two second supporting protrusions 2311; thereby, the second heat dissipation groove 2312 is connected to the heat dissipation cavity, so that the heat dissipation airflow can flow through the second heat dissipation groove 2312 during braking and take away the heat of the supporting heat dissipation rib 231, thereby improving the thermal structural strength of the supporting heat dissipation rib 231 and enhancing the heat dissipation capacity of the disk body 2.

[0048] In addition, if Figure 2 and Figure 5 As shown, the multiple connection structures include multiple positioning pins, the multiple mounting bosses 22 include multiple positioning bosses 222, and the positioning bosses 222 are provided with positioning grooves 2221 for installing positioning pins; the multiple heat dissipation ribs 23 also include multiple short heat dissipation ribs 232, and one end of the positioning boss 222 close to the inner edge of the disc body 2 is located between two short heat dissipation ribs 232 in the circumferential direction of the disc body 2, and one end of the positioning boss 222 close to the outer edge of the disc body 2 is located between the other two short heat dissipation ribs 232 in the circumferential direction of the disc body 2. There is a heat dissipation gap connected to the heat dissipation cavity between the two ends of the positioning boss 222 close to the inner edge and the outer edge of the disc body 2 and the spoke plate of the wheel 1, and the two short heat dissipation ribs 232 located on the same side of the positioning boss 222 in the circumferential direction of the disc body 2 are spaced apart in the radial direction of the disc body 2, so that the interval between the two short heat dissipation ribs 232 is connected to the heat dissipation cavity.

[0049] Therefore, the present invention utilizes the first heat dissipation groove 2213 of each connecting boss 221, the second heat dissipation groove 2312 of each supporting heat dissipation rib 231, the spacing space between two radially opposite short heat dissipation ribs 232, and the heat dissipation gap at each positioning boss 222 to connect with the heat dissipation cavity in the circumferential direction of the disc body 2 to form a continuous air heat dissipation channel, which is beneficial to ensure the heat dissipation air flow rate, increase the convection heat transfer coefficient on the surface of the brake disc during rotation, and dissipate the heat energy generated by braking into the air faster.

[0050] like Figure 3 and Figure 4 As shown, in the embodiment of the present invention, in order to further optimize the heat dissipation effect, the depth of the first heat dissipation groove 2213 and the second heat dissipation groove 2312 is designed, and the spacing between the bottom surface of the first heat dissipation groove 2213 and the inner disk surface 211 of the disk body 2 is H3; the spacing H3 and the height H2 have a relationship of 0.5≤H3 / H2≤0.7. The spacing between the bottom surface of the second heat dissipation groove 2312 and the inner disk surface 211 of the disk body 2 is H4; the spacing H4 and the height H2 have a relationship of 0.5≤H4 / H2≤0.7. Preferably, the spacing H4 is equal to the spacing H3, and H3 / H2 and H4 / H2 are both 0.59.

[0051] Specifically, Figure 2 As shown, in the circumferential direction of the disk body 2, three supporting heat dissipation ribs 231 are distributed between a connecting boss 221 and an adjacent connecting boss 221 on one side; a positioning boss 222 and four short heat dissipation ribs 232 around it are distributed between a connecting boss 221 and an adjacent connecting boss 221 on the other side; that is, a positioning boss 222 and four short heat dissipation ribs 232 around it are combined to form a first combined structure 24, and three supporting heat dissipation ribs 231 arranged at intervals along the circumference of the disk body 2 are combined to form a second combined structure 25, and multiple first combined structures 24 and multiple second combined structures 25 are alternately arranged one by one between multiple connecting bosses 221.

[0052] like Figure 2 and Fig. 9 As shown, in the embodiment of the present invention, the outer contour of the mounting boss 22 is a rhombus with rounded corners, and the rhombus has a first diagonal line 223 and a second diagonal line 224 that are perpendicular to each other, and the first diagonal line 223 of the rhombus is arranged to extend along the radial direction of the disk body 2, so as to reduce the stress concentration problem at the mounting boss 22 on the one hand, and facilitate the airflow in the heat dissipation cavity to flow around the mounting boss 22 and take away the heat of the mounting boss 22 on the other hand, thereby improving the structural thermal strength of the mounting boss 22. Specifically, the outer contours of the connecting boss 221 and the positioning boss 222 are the same.

[0053] like Fig. 9As shown, in the embodiment of the present invention, the outer contour shape of the mounting boss 22 is further optimized. Specifically, taking the connecting boss 221 as an example, the length of the first diagonal 223 is L1, and the length of the second diagonal 224 is L2, which has the relationship: 0.15≤L1 / L2≤0.2; preferably, L1 / L2=0.17. The radius of the two first fillets 225 connected by the first diagonal 223 is R1, and the radius of the two second fillets 226 connected by the second diagonal 224 is R2, which has the relationship: 0.2≤R1 / R2≤0.4; preferably, R1 / R2=0.29.

[0054] The above are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A wheel-mounted brake disc, characterized in that: It comprises two disc bodies, which are symmetrically arranged on both sides of the wheel spoke plate and connected to the wheel spoke plate through a plurality of connecting structures, and a heat dissipation cavity is formed between the inner disc surface of the disc body and the wheel spoke plate; Among them, a plurality of heat dissipation ribs and a plurality of mounting bosses for mounting the connecting structure are distributed on the inner disk surface of the disk body along the circumference of the disk body; the distance between the inner disk surface and the outer disk surface of the disk body is H1, and the heights of the mounting bosses and the heat dissipation ribs protruding relative to the inner disk surface of the disk body are both H2, and the relationship is: 1.5≤H1 / H2≤1.

6.

2. The wheel-mounted brake disc according to claim 1, characterized in that: The material of the disk body is SiC particle reinforced aluminum alloy material.

3. The wheel-mounted brake disc according to claim 1, characterized in that: The outer contour of the mounting boss is a rhombus with rounded corners. The rhombus has a first diagonal and a second diagonal that are perpendicular to each other. The first diagonal of the rhombus is extended along the radial direction of the disk body.

4. The wheel-mounted brake disc according to claim 3, characterized in that: The length of the first diagonal line is L1, and the length of the second diagonal line is L2, and they have the relationship: 0.15≤L1 / L2≤0.

2.

5. The wheel-mounted brake disc according to claim 3, characterized in that: The radius of the two first rounded corners connected by the first diagonal line is R1, and the radius of the two second rounded corners connected by the second diagonal line is R2, and they have the relationship: 0.2≤R1 / R2≤0.

4.

6. The wheel-mounted brake disc according to any one of claims 1 to 5, characterized in that: The plurality of connection structures include a plurality of fastening bolts, the plurality of mounting bosses include a plurality of connection bosses, the connection bosses include a connection convex portion and two first supporting convex portions, the connection convex portion is provided with a bolt hole for installing the fastening bolts, the connection convex portion is located between the two first supporting convex portions in the radial direction of the disk body, and two first heat dissipation grooves communicating with the heat dissipation cavity are formed between the connection convex portion and the two first supporting convex portions; The distance between the bottom surface of the first heat dissipation groove and the inner disk surface of the disk body is H3; the distance H3 and the height H2 have the relationship of: 0.5≤H3 / H2≤0.

7.

7. The wheel-mounted brake disc according to claim 6, characterized in that: The plurality of heat dissipation ribs include a plurality of supporting heat dissipation ribs, the supporting heat dissipation ribs include two second supporting protrusions, the two second supporting protrusions are spaced apart in the radial direction of the disk body so that a second heat dissipation slot communicating with the heat dissipation cavity is formed between the two second supporting protrusions; The distance between the bottom surface of the second heat dissipation groove and the inner disk surface of the disk body is H4; the distance H4 and the height H2 have a relationship of: 0.5≤H4 / H2≤0.

7.

8. The wheel-mounted brake disc according to claim 7, characterized in that: In the circumferential direction of the disk body, three supporting heat dissipation ribs are distributed between one connecting boss and the connecting boss adjacent to one side thereof.

9. The wheel-mounted brake disc according to claim 6, characterized in that: Multiple of the connecting structures include multiple positioning pins, and multiple of the mounting bosses include multiple positioning bosses, each of which is provided with a positioning groove for mounting the positioning pins; multiple of the heat dissipation ribs also include multiple short heat dissipation ribs, one end of the positioning boss close to the inner edge of the disk body is located between two of the short heat dissipation ribs in the circumferential direction of the disk body, and one end of the positioning boss close to the outer edge of the disk body is located between the other two short heat dissipation ribs in the circumferential direction of the disk body.

10. The wheel-mounted brake disc according to claim 9, characterized in that: In the circumferential direction of the disk body, a positioning boss and four short heat dissipation ribs around the positioning boss are distributed between the connecting boss and the connecting boss adjacent to one side of the connecting boss.

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