CN220706279U

CN220706279U - Brake disc assembly

Info

Publication number: CN220706279U
Application number: CN202322276477.XU
Authority: CN
Inventors: 谢维庭
Original assignee: Hong Zhan HPP Su Zhou co Ltd
Current assignee: Hong Zhan HPP Su Zhou co Ltd
Priority date: 2023-08-23
Filing date: 2023-08-23
Publication date: 2024-04-02
Anticipated expiration: 2033-08-23

Abstract

The utility model relates to a brake disc assembly, which comprises an inner ring and an outer ring coaxial with the inner ring, wherein the inner ring comprises a central mounting part, radiating fins coaxially arranged at the periphery, a supporting arm connected between the mounting part and the radiating fins, and a first connecting part arranged on the radiating fins, the outer ring of each radiating fin is provided with a plurality of arc-shaped air inlets which are concave inwards and distributed in a circumferential array, the outer ring comprises a brake ring with the inner ring diameter smaller than the outer ring of each radiating fin and larger than the inner ring diameter of the outer ring of each radiating fin and the outer ring of each brake ring, and a second connecting part arranged on the brake ring and correspondingly connected with the first connecting part, the side surfaces of the first connecting part and the second connecting part are attached, the radiating fins are attached to the side surfaces of the brake ring, and the air inlets and the side surfaces of the outer ring form air guide grooves for interfering air flow. The utility model has simple structure, convenient processing, low processing cost and difficulty, high heat dissipation efficiency and high structural strength and heat dissipation performance, and can be suitable for vehicles or equipment with high travelling speed and high braking requirement.

Description

Brake disc assembly

Technical Field

The utility model relates to a brake disc assembly, which is suitable for the technical field of vehicle braking.

Background

The brake disc is a braking device arranged on a wheel axle of a wheel, and can rotate along with the wheel axle when a vehicle runs, and when the vehicle needs to be braked, the brake disc is clamped by the brake caliper to generate braking force so as to play a role in decelerating or stopping.

The existing brake disc is of an integrated structure, such as the brake disc disclosed in the patent with publication number CN2621146Y, and the brake disc is low in manufacturing cost, but in order to ensure the strength of the product, the brake disc is required to be made of high-strength steel such as stainless steel, and the characteristics of the materials such as stainless steel determine that the brake disc cannot rapidly dissipate heat, so that the brake disc is easy to overheat and generate bad results.

Besides the integral structure, in the prior art, a plurality of brake discs can also adopt a sandwich structure, namely, a heat conducting disc is clamped between the left steel brake disc and the right steel brake disc, for example, the brake discs disclosed in the patent with the publication number of CN111306223A are riveted together through rivets, the heat of the brake discs at the left side and the right side is conducted to the heat conducting disc made of middle aluminum, and the heat is dissipated by the aluminum heat conducting disc. Although the heat radiation performance of the structure is improved, the processing cost and the processing difficulty are improved due to the fact that the structure is more complex, and the whole weight of the brake disc is increased due to the two steel discs; and, the heat conduction dish both sides in this kind of structure are all covered by brake steel disc, and heat radiating area is less, and vehicle travel speed is faster, and when the heat dissipation demand is great, this kind of brake dish just can not satisfy the user demand.

Disclosure of Invention

In order to solve the above-mentioned drawbacks of the prior art, the present utility model provides a brake disc assembly.

The technical scheme adopted by the utility model is as follows: the utility model provides a brake disc subassembly, including being used for installing in epaxial inner ring of shaft, with the outer loop of inner ring coaxial arrangement, the inner ring is including the installation department that is located the central part, coaxial setting is in the peripheral fin of installation department, connect a plurality of support arms between installation department and fin, at least two first connecting portion that set up on the fin, the outer lane of fin has a plurality of air inlets that form towards the axial lead direction of inner ring sunken, and a plurality of air inlets are circumference array distribution around the axial lead of inner ring. The outer ring comprises a brake ring with the inner ring diameter smaller than the outer ring diameter of the radiating fins and larger than the inner ring diameter of the radiating fins and the outer ring diameter larger than the outer ring diameter of the radiating fins, and second connecting parts which are arranged on the brake ring and are connected with the first connecting parts in one-to-one correspondence, the side faces of the first connecting parts are attached to the side faces of the corresponding second connecting parts, the side faces of the radiating fins are attached to the side faces of the brake ring, and the inner wall of the air port and the side faces of the outer ring jointly form an air guide groove for guiding air flow.

Through setting up the brake disc subassembly into outer loop and the structure that the inner ring combined, simplified brake disc structure, not only reduced processing cost, also reduced the processing degree of difficulty, alleviateed product weight, still be convenient for set up the material of outer loop into high strength material, and the inner ring material sets up to easy heat dissipation material to compromise the structural strength and the heat dispersion of brake disc subassembly. The inner ring is composed of the mounting part, the radiating fins, the supporting arm and the first connecting part, the structure is simplified, the weight of the inner ring is reduced on the basis of ensuring the structural strength, the obstruction of the inner ring structure to the air flow is reduced, the air flow can flow through the surface of the inner ring rapidly and smoothly, and the heat dissipation performance of the inner ring is improved; when the inner ring and the outer ring are assembled, the radiating fins are attached to the brake ring, so that the contact surface between the inner ring and the outer ring is improved, and the heat generated by friction between the brake ring and the brake caliper is quickly transferred to the inner ring, thereby facilitating heat dissipation; the inner ring and the outer ring are connected in a mode that the side face of the first connecting part is attached to the side face of the second connecting part, so that the outer ring is arranged on one side of the inner ring, the connection precision requirement of the inner ring and the outer ring is reduced, and the processing difficulty of the brake disc assembly is further reduced; and the wind gap that the fin outer lane set up can increase the air current flux of outer loop both sides on the one hand, and on the other hand wind-guiding groove that forms between wind gap and the outer loop side can interfere the air current around the brake ring through the rotation of brake dish subassembly and the marcing of vehicle for the air velocity of flow around the brake ring is faster, and the flow direction is more unordered, and the heat of brake ring is taken away to the air of being convenient for, and then improves the radiating efficiency of brake dish subassembly.

Further, the first connecting portions are convexly arranged on the other side, opposite to the side, attached to the brake ring, of the radiating fin, the first connecting portions are arranged at the inner ring of the radiating fin, the number of the air openings is the same as that of the first connecting portions, the air openings correspond to the first connecting portions one by one, and the air openings are located on the outer sides of the corresponding first connecting portions. The first connecting part which is arranged in a protruding mode is matched with the air port and the air guide groove, the interference effect of air flow flowing through the brake ring is improved by means of rotation of the brake disc assembly, turbulent flow is formed on the air flow around the brake ring, meanwhile, the air flow speed is improved, and the heat dissipation efficiency of the outer ring is further improved.

Further, the plurality of support arms are distributed in a circumferential array around the axial lead of the inner ring, so that the structural stability of the inner ring is improved, and the brake disc assembly is ensured to rotate stably along with the wheel shaft. Further, the number of the supporting arms is the same as that of the first connecting parts and corresponds to the first connecting parts one by one, the outer ends of the supporting arms are connected with the corresponding first connecting parts, and the structural stability and firmness of the assembled inner ring and outer ring can be improved, so that the structural strength of the brake disc assembly is better. Each supporting arm inclines from the inner end to the outer end towards the rotation direction of the wheel shaft, and the inclination angles of the supporting arms are the same, so that the extending direction of the supporting arms is parallel to the direction of friction force between the brake calipers and the brake ring, the supporting effect of the supporting arms is improved, and the structural strength of the brake disc assembly is further improved.

Further, the projection of each air port on the plane perpendicular to the axial lead of the inner ring is arc-shaped, the size of the air port is increased, and then the interference effect of the air guide groove on air flow is improved.

Further, the outer ring is made of stainless steel, the inner ring is made of aluminum alloy, the wear resistance and the structural strength of the brake disc assembly can be guaranteed by the stainless steel of the outer ring, and the heat dissipation performance can be improved while the structural strength of the inner ring is guaranteed by the aluminum alloy of the inner ring.

Further, a plurality of heat dissipation holes are formed in the brake ring, on one hand, the blocking of air flow can be reduced through the heat dissipation holes, and the heat dissipation performance of the brake ring can be improved by being matched with the air port in the inner ring; on the other hand, the weight of the brake ring can be reduced by the heat dissipation holes, so that the brake disc assembly is lighter, and adverse effects on vehicle braking caused by the inertia of the brake disc are reduced; meanwhile, the friction force between the brake ring and the brake caliper can be increased through the heat dissipation holes, so that the braking efficiency is improved.

Furthermore, each heat dissipation hole is inclined from the inner ring of the brake ring to the outer ring of the brake ring towards the rotating direction of the wheel shaft, so that on one hand, the air flow flowing through the heat dissipation holes can be guided towards the inner ring, and the air flow speed and the turbulence degree of the air flow around the brake ring can be conveniently improved by matching the air guide groove with the first connecting part; on the other hand, the moving direction of the brake caliper relative to the brake ring is opposite to the inclination direction of the heat dissipation holes when the brake caliper brakes, and the friction force between the brake caliper and the brake ring is further improved.

Further, the connecting holes are formed in the first connecting portion and the second connecting portion, the brake disc assembly further comprises connecting pieces used for connecting the first connecting portion and the second connecting portion through the connecting holes in the first connecting portion and the second connecting portion, at least two connecting holes in each of the first connecting portion and the second connecting portion are formed in the connecting holes, the connecting pieces are set to be bolts, and connection firmness between the inner ring and the outer ring is guaranteed through the connecting holes and the connecting pieces.

Further, the second connecting portion protrudes from the inner ring of the brake ring towards the axial line direction of the brake ring, in the projection on the plane perpendicular to the axial line of the inner ring, the side face of the second connecting portion and the inner wall of the air port jointly form an air guide groove, and the heat dissipation hole on the brake ring, which is located near the second connecting portion, extends inwards to the second connecting portion. The second connecting portion protrudes inwards and covers one side of the air port, an air guide groove is formed between the second connecting portion and the air port, meanwhile, the radiating holes in the portion extend inwards, the blocking of air flow is reduced while the outer ring and the inner ring are connected, the air guide groove and the first connecting portion are convenient to guide and interfere the air flow, and radiating efficiency is improved.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the brake disc assembly is simple in structure and convenient to process, is assembled by the inner ring and the outer ring, reduces processing cost, reduces processing difficulty, reduces product weight, and is convenient to achieve the effect of considering the structural strength and heat dissipation performance of the brake disc by respectively arranging the materials of the inner ring and the outer ring, the connecting structure between the structure of the inner ring and the connecting structure between the structure of the outer ring and the connecting structure of the outer ring can improve the flow speed of air flowing through the brake disc, and the air flow flux and the interference effect on the air flow can be increased through the air port and the air guide groove, so that the air flow speed around the outer ring is faster, the flow direction is disordered, the heat dissipation efficiency and the heat dissipation performance of the brake disc are improved, and the brake disc assembly can be suitable for vehicles or equipment with higher running speed and higher braking requirements.

Drawings

Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like components or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic view of the structure of one embodiment of the present utility model 1;

FIG. 2 is a schematic view of the structure of the embodiment of FIG. 1;

FIG. 3 is a schematic view of the embodiment of FIG. 1, illustrating the construction of FIG. 3;

FIG. 4 is a schematic view of the inner ring structure of the embodiment of FIG. 1;

FIG. 5 is a schematic view of the outer ring structure of the embodiment of FIG. 1;

the reference numerals are explained as follows:

1. an inner ring; 11. a mounting part; 12. a heat sink; 13. a support arm; 14. a first connection portion; 141. a connection hole; 142. a connecting piece; 15. an air port; 151. an air guide groove; 2. an outer ring; 21. a brake ring; 211. a heat radiation hole; 22. and a second connecting part.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "inner" and "outer" in the description of the direction are defined according to the installation direction of the brake disc assembly, specifically, the direction toward the wheel axle is "inner" when the brake disc assembly is normally installed, and is "outer" when the brake disc assembly is normally installed. The terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Referring to fig. 1-5, the brake disc assembly in this embodiment includes an inner ring 1 for being mounted on a wheel axle, an outer ring 2 coaxially mounted with the inner ring 1, the inner ring 1 includes a mounting portion 11 located at a central portion, a plurality of support arms 13 coaxially disposed at the periphery of the mounting portion 11, and connected between the mounting portion 11 and the heat sink 12, at least two first connection portions 14 disposed on the heat sink 12, an outer ring of the heat sink 12 has a plurality of air ports 15 formed by being recessed toward an axial line direction of the inner ring 1, and the plurality of air ports 15 are distributed in a circumferential array around the axial line of the inner ring 1; the outer ring 2 comprises a brake ring 21 with the diameter of an inner ring a smaller than the diameter of an outer ring d of the radiating fins 12 and larger than the diameter of an inner ring c of the radiating fins 12 and the diameter of an outer ring b larger than the diameter of the outer ring d of the radiating fins 12, and second connecting parts 22 which are arranged on the brake ring 21 and are connected with the first connecting parts 14 in a one-to-one correspondence manner, wherein the side surfaces of the first connecting parts 14 are attached to the side surfaces of the corresponding second connecting parts 22, the side surfaces of the radiating fins 12 are attached to the side surfaces of the brake ring 21, and the inner wall of the air port 15 and the side surfaces of the outer ring 2 jointly form an air guide groove 151 for guiding air flow. Through setting up the brake disc subassembly into the structure that outer loop 2 and inner loop 1 combined together, simplified brake disc structure, not only reduced the processing cost, also reduced the processing degree of difficulty, alleviateed product weight, still be convenient for set up the material of outer loop 2 as high strength material, and inner loop 1 material sets up to easily heat dissipation material to compromise the structural strength and the heat dispersion of brake disc subassembly. The inner ring 1 is composed of the mounting part 11, the radiating fins 12, the supporting arms 13 and the first connecting part 14, so that the structure is simplified, the weight of the inner ring 1 is reduced on the basis of ensuring the structural strength, the obstruction of the inner ring 1 structure to the air flow is reduced, the air flow can quickly and smoothly flow through the surface of the inner ring 1, and the heat dissipation performance of the inner ring 1 is improved; when the inner ring 1 and the outer ring 2 are assembled, the radiating fins 12 are attached to the brake ring 21, so that the contact surface between the inner ring 1 and the outer ring 2 is improved, and the heat generated by friction between the brake ring 21 and the brake caliper is quickly transferred to the inner ring 1, thereby facilitating heat dissipation; the inner ring 1 and the outer ring 2 are connected in a mode that the side face of the first connecting part 14 is attached to the side face of the second connecting part 22, so that the outer ring 2 is installed on one side of the inner ring 1, the connection precision requirement of the inner ring 1 and the outer ring 2 is reduced, the processing difficulty of the brake disc assembly is further reduced, on one hand, the air flow flux of two sides of the outer ring 2 can be increased through the air inlets 15 arranged on the outer ring 12, on the other hand, the air guide grooves 151 formed between the air inlets 15 and the side face of the outer ring 2 can interfere the air flow around the brake ring 21 through the rotation of the brake disc assembly and the advancing of a vehicle, the air flow speed around the brake ring 21 is faster, the flow direction is more disordered, the air is convenient to take away the heat of the brake ring 21, and the heat dissipation efficiency of the brake disc assembly is further improved.

In a more preferred embodiment, the first connecting portions 14 are convexly disposed on the other side of the heat sink 12 opposite to the side where the brake ring 21 is attached, and the first connecting portions 14 are disposed at the inner ring of the heat sink 12, the air openings 15 are the same as the first connecting portions 14 in number and one-to-one correspondence, the air openings 15 are located at the outer sides of the corresponding first connecting portions 14, and the air openings 15 and the air guide grooves 151 cooperate with each other through the convexly disposed first connecting portions 14, so that the interference effect of the air flow flowing through the brake ring 21 is improved by the rotation of the brake disc assembly, the air flow around the brake ring 21 forms turbulence, the air flow velocity is improved, and the heat dissipation efficiency of the outer ring 2 is further improved.

In a more preferred embodiment, the plurality of support arms 13 are distributed in a circumferential array around the axis of the inner ring 1, which improves the structural stability of the inner ring 1 and ensures smooth rotation of the brake disc assembly with the wheel shaft. Further, the number of the supporting arms 13 is the same as that of the first connecting parts 14 and corresponds to each other one by one, and the outer ends of the supporting arms 13 are connected with the corresponding first connecting parts 14, so that the structural stability and firmness of the assembled inner ring 1 and outer ring 2 can be improved, and the structural strength of the brake disc assembly is better; each supporting arm 13 inclines from the inner end to the outer end towards the rotation direction of the wheel shaft, and the inclination angles of each supporting arm 13 are the same, so that the extending direction of the supporting arm 13 is parallel to the direction of the friction force between the brake caliper and the brake ring 21, the supporting effect of the supporting arm 13 is improved, and the structural strength of the brake disc assembly is further improved.

In a more preferred embodiment, the projection of each tuyere 15 on a plane perpendicular to the axis of the inner ring 1 is arc-shaped, increasing the size of the tuyere 15 and thus the interference of the air guide groove 151 with the air flow.

In a more preferred embodiment, the outer ring 2 is made of stainless steel, the inner ring 1 is made of aluminum alloy, the stainless steel of the outer ring 2 can ensure the wear resistance and the structural strength of the brake disc assembly, and the aluminum alloy of the inner ring 1 can improve the heat dissipation performance while ensuring the structural strength.

In a more preferred embodiment, the brake ring 21 is provided with a plurality of heat dissipation holes 211, on the one hand, the blocking of air flow can be reduced through the heat dissipation holes 211, so that the heat dissipation performance of the brake ring 21 can be improved by matching with the air ports 15 in the inner ring 1; on the other hand, the heat dissipation holes 211 can also lighten the weight of the brake ring 21, so that the brake disc assembly is lighter, and adverse effects on vehicle braking caused by the inertia of the brake disc are reduced; meanwhile, the heat dissipation holes 211 can also increase the friction force between the brake ring 21 and the brake caliper, thereby improving the braking efficiency.

In a more preferred embodiment, each heat dissipation hole 211 is inclined from the inner ring of the brake ring 21 to the outer ring thereof towards the rotation direction of the wheel axle, so that on one hand, the air flowing through the heat dissipation holes 211 can be guided towards the inner ring 1, and the air flow speed and the turbulence degree of the air flow around the brake ring 21 can be improved by matching the air guide groove 151 with the first connecting part 14; on the other hand, the moving direction of the brake caliper relative to the brake ring 21 is opposite to the inclination direction of the heat dissipation holes 211, so that the friction force between the brake caliper and the brake ring 21 is further improved.

In a more preferred embodiment, the first and second connection portions 14 and 22 are each provided with a connection hole 141, and the brake disc assembly further includes a connection member 142 for connecting the first and second connection portions 14 and 22 through the connection holes 141 of the first and second connection portions 14 and 22. At least two connecting holes 141 are formed in each of the first connecting portion 14 and the second connecting portion 22, the connecting piece 142 is provided as a bolt, and the connection firmness between the inner ring 1 and the outer ring 2 is ensured through the connecting holes 141 and the connecting piece 142.

In a more preferred embodiment, the second connecting portion 22 is formed by protruding from the inner ring of the brake ring 21 toward the axial line of the brake ring 21, and in the projection on the plane perpendicular to the axial line of the inner ring 1, the side surface of the second connecting portion 22 and the inner wall of the tuyere 15 together form the air guiding groove 151, and the heat dissipating holes 211 on the brake ring 21 located near the second connecting portion 22 extend inward to the second connecting portion 22. The second connecting portion 22 protrudes inwards and covers one side of the air port 15, forms an air guide groove 151 with the air port 15, simultaneously extends the heat dissipation hole 211 of the part inwards, reduces blocking of air flow while realizing connection between the outer ring 2 and the inner ring 1, and facilitates guiding and interference of the air flow by the air guide groove 151 and the first connecting portion 14, so that heat dissipation efficiency is improved.

the brake disc assembly is simple in structure and convenient to process, is assembled by the inner ring and the outer ring, reduces processing cost, reduces processing difficulty, reduces product weight, and is convenient to achieve the effect of taking the structural strength and the heat dissipation performance of the brake disc into consideration by respectively arranging the materials of the inner ring and the outer ring, the flow speed of air flowing through the brake disc can be improved by the connecting structure between the structure of the inner ring and the inner ring, the air flow speed and the interference effect on the air flow can be increased by the air port and the air guide groove, the air flow speed around the outer ring is faster, the flow direction is more disordered, and the heat dissipation efficiency and the heat dissipation performance of the brake disc are improved, so that the brake disc assembly can be suitable for vehicles or equipment with higher running speed and higher braking requirements.

The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the present utility model and to implement the same, but are not intended to limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.

Claims

1. A brake disc assembly comprising an inner ring (1) for mounting on a wheel axle, an outer ring (2) coaxially mounted with the inner ring (1), characterized in that: the inner ring (1) comprises a mounting part (11) positioned at the central part, radiating fins (12) coaxially arranged at the periphery of the mounting part (11), a plurality of supporting arms (13) connected between the mounting part (11) and the radiating fins (12), at least two first connecting parts (14) arranged on the radiating fins (12), wherein the outer ring of the radiating fins (12) is provided with a plurality of air openings (15) formed by sinking towards the axial line direction of the inner ring (1), and the air openings (15) are distributed in a circumferential array around the axial line of the inner ring (1);

the outer ring (2) comprises a brake ring (21) with the inner ring diameter smaller than the outer ring diameter of the radiating fins (12) and larger than the inner ring diameter of the radiating fins (12), and second connecting portions (22) which are arranged on the brake ring (21) and are connected with the first connecting portions (14) in one-to-one correspondence, the side faces of the first connecting portions (14) are attached to the corresponding side faces of the second connecting portions (22), the side faces of the radiating fins (12) are attached to the side faces of the brake ring (21), and the inner wall of the air port (15) and the side faces of the outer ring (2) jointly form an air guide groove (151) for interfering air flow.

2. A brake disc assembly according to claim 1, wherein: the first connecting portions (14) are convexly arranged on the other side, opposite to the side, attached to the brake ring (21), of the radiating fins (12), the first connecting portions (14) are arranged at the inner ring of the radiating fins (12), the number of the air openings (15) is the same as that of the first connecting portions (14) and corresponds to the number of the air openings one by one, and the air openings (15) are located on the outer side of the corresponding first connecting portions (14).

3. A brake disc assembly according to claim 1, wherein: the support arms (13) are distributed in a circumferential array around the axial lead of the inner ring (1), each support arm (13) is inclined from the inner end to the outer end towards the rotation direction of the wheel shaft, and the inclination angles of the support arms (13) are the same.

4. A brake disc assembly according to claim 1, wherein: the projections of each tuyere (15) on a plane perpendicular to the axial line of the inner ring (1) are arc-shaped.

5. A brake disc assembly according to claim 1, wherein: the outer ring (2) is made of stainless steel, and the inner ring (1) is made of aluminum alloy.

6. A brake disc assembly according to claim 1, wherein: the brake ring (21) is provided with a plurality of heat dissipation holes (211).

7. The brake disc assembly of claim 6, wherein: each of the heat dissipation holes (211) is inclined from the inner ring of the brake ring (21) to the outer ring thereof toward the rotation direction of the wheel shaft.

8. A brake disc assembly according to claim 1, wherein: the brake disc assembly comprises a first connecting part (14) and a second connecting part (22), wherein the first connecting part (14) and the second connecting part (22) are respectively provided with a connecting hole (141), and the brake disc assembly further comprises a connecting piece (142) used for connecting the first connecting part (14) and the second connecting part (22) through the connecting holes (141) on the first connecting part (14) and the second connecting part (22).

9. The brake disc assembly of claim 8, wherein: at least two connecting holes (141) are formed in each of the first connecting portion (14) and the second connecting portion (22), and the connecting piece (142) is a bolt.

10. The brake disc assembly of claim 6, wherein: the second connecting portion (22) protrudes from the inner ring of the brake ring (21) towards the axial line direction of the brake ring (21), in the projection on the plane perpendicular to the axial line of the inner ring (1), the side surface of the second connecting portion (22) and the inner wall of the air port (15) jointly form the air guide groove (151), and the heat dissipation hole (211) on the brake ring (21) located near the second connecting portion (22) extends inwards to the second connecting portion (22).