阅读说明：本技术 一种内通风式制动盘 (Interior ventilation formula brake disc ) 是由 文震 刘著 尹东阳 于 2019-09-04 设计创作，主要内容包括：本发明提供了一种内通风式制动盘,包括安装盘、环状摩擦盘以及支撑架,环状摩擦盘包括同轴设置的第一摩擦盘和第二摩擦盘,第一摩擦盘与第二摩擦盘之间设置有若干个沿圆周径向设置的连接部,相邻的连接部之间形成由环状摩擦盘的中心连通至环状摩擦盘外侧的主风道,连接部包括至少两个在圆周径向上间隔设置的加强筋,相邻的加强筋之间形成与主风道连通的侧风道。本发明所提供的一种内通风式制动盘,在环状摩擦盘内部设置有主风道,连接部由多个加强筋间隔设置形成侧风道,侧风道与主风道连通,形成较大流量以及利于对流换热的冷却空气,增加冷却空气在环状摩擦盘内停留的时间,可以大幅提高环状摩擦盘内部的散热性能和散热效率。(The invention provides an internal ventilation type brake disc which comprises a mounting disc, annular friction discs and a support frame, wherein each annular friction disc comprises a first friction disc and a second friction disc which are coaxially arranged, a plurality of connecting parts which are radially arranged along the circumference are arranged between the first friction disc and the second friction disc, a main air duct communicated to the outer side of each annular friction disc from the center of each annular friction disc is formed between every two adjacent connecting parts, each connecting part comprises at least two reinforcing ribs which are radially arranged at intervals in the circumference, and a side air duct communicated with the main air duct is formed between every two adjacent reinforcing ribs. According to the internal ventilation type brake disc provided by the invention, the main air channel is arranged in the annular friction disc, the connecting part is provided with the side air channels at intervals by the plurality of reinforcing ribs, the side air channels are communicated with the main air channel, so that cooling air with larger flow and favorable for heat convection is formed, the staying time of the cooling air in the annular friction disc is prolonged, and the heat radiation performance and the heat radiation efficiency in the annular friction disc can be greatly improved.)

1. An internal ventilation type brake disc comprises a mounting disc, annular friction discs and a support frame used for connecting the mounting disc and the annular friction discs, wherein the annular friction discs comprise a first friction disc and a second friction disc which are coaxially arranged, a plurality of connecting parts which are arranged along the circumferential radial direction are arranged between the first friction disc and the second friction disc, a main air duct which is communicated from the center of the annular friction discs to the outer side of the annular friction discs is formed between the adjacent connecting parts, each connecting part comprises at least two reinforcing ribs which are arranged at intervals in the circumferential radial direction, and a side air duct communicated with the main air duct is formed between the adjacent reinforcing ribs.

2. An internally ventilated brake disc according to claim 1, wherein the width of the connecting portion in the circumferential direction gradually increases from the center of the circumference outward.

3. An internally ventilated brake disc according to claim 1, wherein a first friction disc of said annular friction discs is fixedly connected to said mounting disc by said support frame, said first friction disc having a thickness greater than a thickness of said second friction disc.

4. The internally ventilated brake disc of claim 1, wherein said annular friction disc further includes heat dissipating portions on said primary air channel, said heat dissipating portions including at least one circumferentially radially disposed first heat dissipating projection on said first friction disc.

5. The internally ventilated brake disc of claim 4, wherein said heat sink portion further comprises at least one second heat sink protrusion disposed radially along the circumference of said second friction disc.

6. An internally ventilated brake disc as set forth in claim 5, wherein said first and second friction discs each have oppositely disposed ventilation faces and oppositely disposed friction faces, and said first and second heat dissipating projections are each disposed on said ventilation faces.

7. The internally ventilated brake disc of claim 6, wherein the first and second heat dissipating projections each have a circular arc shaped heat dissipating surface projecting from the ventilation surface.

8. An internally ventilated brake disc according to claim 6, wherein said heat dissipation surface is spaced from said ventilation surface by a distance equal to or less than 1/4 of the spacing between said ventilation surfaces.

9. An internally ventilated brake disc according to claim 6, wherein adjacent ones of said first heat dissipating projections are circumferentially spaced apart and adjacent ones of said second heat dissipating projections are circumferentially spaced apart.

10. The internally ventilated brake disc of claim 1, wherein the support bracket includes a first support portion disposed perpendicular to the outer circumference of the mounting disc and a second support portion extending from an end of the first support portion to the inner circumference of the annular friction disc, the first support portion and the second support portion forming an acute angle therebetween.

Technical Field

The invention relates to the technical field of automobile braking systems, in particular to an internal ventilation type brake disc.

Background

A brake disc is a rotating element of a vehicle, and braking is performed by using surface friction between a fixed element such as a brake pad and a rotating element to generate braking force, so as to block the vehicle or slow down the movement tendency of the vehicle. The vehicle is decelerated, stopped, or kept in a stationary state by a frictional force generated inside the brake disc. Based on the principle, when the vehicle runs, kinetic energy of the vehicle is converted into heat energy through braking, and the braking effect is achieved. In the braking process, the temperature of the brake disc is increased by heat generated by friction, and the brake disc is easy to deform and has hidden troubles of brake shaking. Therefore, the heat dissipation efficiency of the brake disc is not high, and cracks can be generated prematurely under the condition of frequent braking, thereby affecting the safety and comfort of the vehicle.

In order to improve the temperature rise condition of the brake disc in the using process, the heat dissipation efficiency of the brake disc is improved, and the stable braking performance of the brake is ensured. Many existing brake discs are provided with mutually independent ventilation ducts inside to improve the ventilation effect of the brake discs. However, the adjacent air channels arranged inside the brake disc are mutually independent, cooling air can only circulate along a single channel, and the adjacent channels cannot be communicated with each other, so that air flow with larger flow and favorable for convective heat transfer is difficult to form. And the mutually independent air channels enable the staying time of cooling air in the air channels to be short, so that the heat exchange efficiency is low, and the heat dissipation effect is not ideal. Meanwhile, in the existing air channel structure arranged in the brake disc, the requirement of lightweight of the brake disc is not considered in order to ensure the connection strength, so that the problem that the connection strength is excessive and the mass of the brake disc is increased is caused.

Disclosure of Invention

The invention aims to solve the defects that ventilation channels in the existing brake disc are arranged independently, so that the heat exchange efficiency is low, the heat dissipation effect is not ideal, and the connection strength is excessive without considering the requirement of lightweight of the brake disc, and provides an internal ventilation type brake disc.

The technical scheme adopted by the invention for solving the technical problems is as follows: an internal ventilation type brake disc comprises a mounting disc, annular friction discs and a support frame used for connecting the mounting disc and the annular friction discs, wherein the annular friction discs comprise a first friction disc and a second friction disc which are coaxially arranged, a plurality of connecting parts which are radially arranged along the circumference are arranged between the first friction disc and the second friction disc, a main air duct which is communicated to the outer side of the annular friction discs from the centers of the annular friction discs is formed between the adjacent connecting parts, each connecting part comprises at least two reinforcing ribs which are radially arranged at intervals in the circumference, and a side air duct communicated with the main air duct is formed between the adjacent reinforcing ribs.

Further, the width of the connecting portion in the circumferential direction gradually increases from the center of the circumference outward.

Further, a first friction disc of the annular friction disc is fixedly connected with the mounting disc through the support frame, and the thickness of the first friction disc is larger than that of the second friction disc.

Furthermore, the annular friction disc is further provided with a heat dissipation part on the main air duct, and the heat dissipation part comprises at least one first heat dissipation protrusion arranged on the first friction disc along the circumferential radial direction.

Specifically, the heat radiating part further comprises at least one second heat radiating protrusion arranged on the second friction disc along the radial direction of the circumference.

Specifically, the first friction disk and the second friction disk both have ventilation surfaces arranged oppositely and friction surfaces arranged oppositely, and the first heat dissipation protrusions and the second heat dissipation protrusions are arranged on the ventilation surfaces.

Specifically, the first heat dissipation protrusion and the second heat dissipation protrusion each have a circular arc-shaped heat dissipation surface protruding from the ventilation surface.

Specifically, the height of the heat dissipation surface from the ventilation surface is less than or equal to 1/4 of the distance between the two ventilation surfaces.

Specifically, the adjacent first heat dissipation protrusions are arranged at intervals in the circumferential radial direction, and the adjacent second heat dissipation protrusions are arranged at intervals in the circumferential radial direction.

Further, the support frame comprises a first support part arranged perpendicular to the outer circumference of the mounting plate and a second support part extending from the end of the first support part to the inner circumference of the annular friction plate, and an included angle formed between the first support part and the second support part is an acute angle.

The internal ventilation type brake disc provided by the invention has the beneficial effects that: the annular friction disc is internally provided with connecting parts which are mutually spaced, a main air duct communicated from the center of the annular friction disc to the outer side is formed by the spaced connecting parts, the connecting parts are arranged at intervals by a plurality of reinforcing ribs to form side air ducts, the arrangement of the side air ducts not only can realize the communication between the adjacent main air ducts, but also can reduce the whole weight of the annular friction disc while meeting the connection and support strength of the first friction disc and the second friction disc, meets the requirement of the whole lightweight design of the brake disc, and the side air ducts arranged on the connecting parts are communicated with the main air duct to form cooling air with larger flow and beneficial to convection heat exchange, increases the stay time of the cooling air in the annular friction disc, can greatly improve the heat dissipation performance and the heat dissipation efficiency in the annular friction disc, and can dissipate heat generated by the external friction of the annular friction disc even through the heat convection between the main air duct and, therefore, the temperature rise of the brake disc during vehicle braking can be effectively improved.

Drawings

Fig. 1 is a schematic perspective view of an internally ventilated brake disc according to the present invention;

FIG. 2 is an axial, full sectional view of an internally ventilated brake rotor according to the present invention;

FIG. 3 is a side view of an internally ventilated brake rotor provided by the present invention;

fig. 4 is a schematic perspective view of an internally ventilated brake disc according to the present invention, with a portion of the second friction disc removed to reveal the internal structure of the first friction disc;

fig. 5 is a schematic perspective view of an internally ventilated brake disc according to the present invention, with a portion of the first friction disc removed to reveal the internal structure of the second friction disc.

In the figure: 100-inner ventilated brake disc, 10-mounting disc, 11-mounting hole, 12-fixing hole, 13-positioning hole, 20-annular friction disc, 21-first friction disc, 211-ventilation surface of first friction disc, 212-friction surface of first friction disc, 22-second friction disc, 221-ventilation surface of second friction disc, 222-friction surface of second friction disc, 23-connecting part, 231-reinforcing rib, 2311-strip rib, 2312-column rib, 24-main air duct, 25-side air duct, 26-heat dissipation part, 261-first heat dissipation protrusion, 2611-heat dissipation surface of first heat dissipation protrusion, 262-second heat dissipation protrusion, 2621-heat dissipation surface of second heat dissipation protrusion, 30-support frame, 31-first support part, 32-second support part, The thickness of the H-ring friction disk, the thickness of the H1-first friction disk, the thickness of the H2-second friction disk, the height of the H3-heat dissipation surface from the ventilation surface, the distance between the H4-two ventilation surfaces, the width of the L1-connecting part near the center of the circumference, and the width of the L2-connecting part far from the center of the circumference.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-5, an internally ventilated brake rotor 100 according to the present invention is provided. The brake disc 100 of the present invention is mounted on a retaining hub (not shown) together with a wheel, and a brake caliper is disposed on the wheel to contact friction surfaces (212, 222) on both sides of the brake disc 100, thereby achieving a braking effect of the wheel. As shown in fig. 1, the brake disc 100 of the present invention includes a mounting disc 10, an annular friction disc 20, and a support frame 30 for connecting the mounting disc 10 and the annular friction disc 20. The brake disc 100 of the inner ventilation type provided in this embodiment is made of cast iron, and the mounting disc 10, the annular friction disc 20, and the support frame 30 are all integrally cast. The mounting plate 10 is provided coaxially with the annular friction plate 20, and a mounting hole 11 is provided at the center of the mounting plate 10, through which mounting hole 11 a vehicle hub bearing (not shown) is connected. The mounting plate 10 is further provided with a positioning hole 13, and the positioning hole 13 is arranged to fix the inner vented brake disc 100 to the flange surface of the hub bearing in advance when the inner vented brake disc 100 is assembled with the hub bearing. Meanwhile, five fixing holes 12 are uniformly distributed on the outer circumferential surface of the mounting disc 10 surrounding the mounting hole 11, a pentagonal structure is formed among the five fixing holes 12, and the mounting disc 10 is fixedly connected with a hub bearing of a vehicle through the fixing holes 12 and the mounting hole 11, so that the internal ventilation type brake disc 100 provided by the invention is fixed on the hub bearing.

As shown in fig. 1 and 3, the annular friction disk 20 includes a first friction disk 21 and a second friction disk 22 which are coaxially disposed. The first friction disc 21 and the second friction disc 22 are coaxially and oppositely arranged, wherein the first friction disc 21 is fixedly connected with the mounting disc 10 through the support frame 30. The first friction disk 21 and the second friction disk 22 each have ventilation surfaces (211, 221) disposed opposite to each other and friction surfaces (212, 222) disposed opposite to each other. The ventilation surface (211, 221) is located between the first friction disk 21 and the second friction disk 22, and the friction surface (212, 222) is located outside the first friction disk 21 and the second friction disk 22, the friction surface (212, 222) is used for contacting with a brake pad on the brake caliper, and braking of the vehicle is achieved through friction. When the brake disk abuts against the annular friction disk 20, heat generated by friction is transmitted to the first friction disk 21 and the second friction disk 22, which increases the temperature of the entire annular friction disk 20, and the heat needs to be efficiently dissipated through the first friction disk 21 and the second friction disk 22, thereby achieving the braking performance of the brake disk 100 and achieving efficient heat transfer.

Specifically, as shown in fig. 1 to 5, in the brake disc 100 of the internally ventilated type according to the present invention, a plurality of connecting portions 23 are disposed between a first friction disc 21 and a second friction disc 22 in the annular friction disc 20, and a main air duct 24 is formed between adjacent connecting portions 23 and is communicated from the center of the annular friction disc 20 to the outer side of the annular friction disc 20. As shown in fig. 4 and 5, the upper and lower end surfaces of the connecting portion 23 are respectively provided on the ventilation surface 211 of the first friction disk 21 and the ventilation surface 221 of the second friction disk 22, and the connecting portion 23 serves to connect and point out the first friction disk 21 and the second friction disk 22. Meanwhile, the connecting portions 23 are radially arranged along the circumference, and each connecting portion 23 is arranged in a manner of diverging from a position close to the center of the first friction disc 21 to a side far from the center of the first friction disc, so that a plurality of main air ducts 25 are formed between the adjacent connecting portions 23 on the first friction disc 21 and the second friction disc 22. The main air duct 25 realizes air circulation between the inside of the circle center and the outside of the circumference of the annular friction disc 20, and cold air enters the main air duct 25 from the center of the annular friction disc 20, passes through the inside of the annular friction disc 20, and is discharged from the outside of the annular friction disc 20, so that the heat exchange process between the cold air and the annular friction disc 20 is realized, and the heat convection of the air inside the first friction disc 21 and the second friction disc 22 is ensured. In the brake disc 100 of the internal ventilation type according to the present invention, the connecting portion 23 includes at least two ribs 231 spaced apart from each other in a circumferential radial direction, and a side air passage 25 communicating with the main air passage 24 is formed between adjacent ribs 231. As shown in fig. 4 and 5, in the present embodiment, the rib 231 of each connecting portion 23 includes a rib 2311 near the center of the annular friction disk 20 and a rib 2312 spaced apart from the rib 2311 in the circumferential radial direction. The purpose of this design is that the connection portion 23 on the circle center side is subjected to a large connection stress, requiring a more stable connection, while the connection portion 23 on the outer side of the circumference is subjected to a relatively small stress, and thus may be provided in a columnar structure. The strip ribs 2311 and the columnar ribs 2312 form side air ducts 25 for air to flow through. Of course, in the internal ventilation brake disc 100 provided by the present invention, the connecting portion 23 may also be provided with a plurality of strip-shaped reinforcing ribs arranged at intervals along the axial direction, and the intervals between adjacent strip-shaped reinforcing ribs form side air ducts through which air can pass. Each of the connecting portions 23 has a side air duct 25 thereon, so that the adjacent main air ducts 24 are communicated with each other through the side air ducts 25. In the brake disc 100 of the internal ventilation type provided by the invention, the adjacent main air ducts 24 are communicated with each other through the side air ducts 25 arranged on the connecting part 23. Through the arrangement of the side air duct 25, the space through which air can flow between the first friction disc 21 and the second friction disc 22 is increased, so that the air flow rate in the annular friction disc 20 is increased, convection heat exchange is facilitated, the staying time of cooling air in the first friction disc 21 and the second friction disc 22 can be increased, and the heat radiation effect and the heat exchange efficiency of the annular friction disc 20 are greatly improved.

In the internally ventilated brake disc 100 provided by the invention, the natural frequency and the vibration mode of the brake disc are analyzed through a mode before the brake disc is manufactured, and the size or the number of the strip-shaped reinforcing ribs 2311 and the columnar reinforcing ribs 2312 can be adjusted after the analysis, so that the natural frequency of the brake disc 100 is changed, the design requirement is met, and the frequency of brake noise generation is reduced. The internally ventilated brake disc 100 produced in this manner is simpler, more efficient and less costly than prior art methods of changing the natural frequency of the brake disc by changing the material composition content. Meanwhile, in the internally ventilated brake disc 100 provided by the invention, the connecting part 23 is provided with the spaced reinforcing ribs 231, so that the heat dissipation efficiency can be improved, the connection strength and the support strength of the first friction disc 21 and the second friction disc 22 can be ensured, and the quality of the reinforcing ribs 231 can be reduced. On the premise of ensuring the connection stability of the annular friction disc 20, a plurality of gaps may be provided, that is, a plurality of side air ducts 25 are provided on the connection portion 23, so that the weight of the entire annular friction disc 20 may be reduced, and the requirement of lightweight design of the brake disc 100 is further facilitated.

Further, as shown in fig. 4, the present invention provides an internally ventilated brake disc 100 in which the width of the connecting portion 23 in the circumferential direction is gradually increased from the center of the circumference outward. In this embodiment, the strip-shaped ribs 2311 are designed with different widths, so that the main air duct 24 in the annular friction disc 20 is in a trumpet shape, wherein the cross-sectional area of the main air duct 24 on the side close to the center of the circle is larger, and the cross-sectional area of the main air duct 24 on the side far from the center of the circle is smaller. Correspondingly, in the present embodiment, the width L2 of the bar-shaped rib 2311 on the side away from the circumferential center is greater than the width L1 on the side close to the circumferential center. The purpose of this design is to increase the contact area of air and to facilitate the wind guiding, so that the cool air can flow from the center of the annular friction disk 20 to the outside. Also, in this embodiment, the width L2 of the connecting portion 23 away from the circumferential center is 1-2mm larger than the width L1 near the circumferential center. The unequal width design of the connecting part 23 can increase the heat dissipation area at the main air duct 24 and the side air duct 25, and the effect of improving the heat dissipation efficiency is achieved by improving the contact area between the cold air and the inside of the annular friction disc 20.

Further, as shown in fig. 2, in the internally ventilated brake disc 100 according to the present invention, the annular friction disc 20 has a thickness H1 of the first friction disc 21 greater than a thickness H2 of the second friction disc 22. The annular friction disc 20 has a thickness H1 of the first friction disc 21 greater than a thickness H2 of the second friction disc 22 while ensuring a constant overall thickness H, so that the distance H4 between the ventilation surface 211 of the first friction disc 21 and the ventilation surface 212 of the second friction disc 22 is reduced. Specifically, the difference in thickness between the thickness H1 of the first friction disk 21 and the thickness H2 of the second friction disk 22 is 1mm or less. That is, the thickness H1 of the first friction disc 21 is slightly larger than the thickness H2 of the second friction disc 22, so that the design can not only effectively increase the strength and rigidity of the entire brake disc 100, but also effectively suppress the problem of thermal deformation caused by expansion and contraction.

Further, in the internally ventilated brake disc 100 according to the present invention, the ring-shaped friction disc 20 is further provided with a heat dissipating portion 26 on the main air duct 24, and the heat dissipating portion 26 includes at least one first heat dissipating protrusion 261 arranged radially along the circumference and arranged on the first friction disc 21. The heat dissipation portion 26 is disposed on the main air duct 24, and can effectively increase the contact area between the annular friction disk 20 and the cold air at the main air duct 24, thereby improving the heat dissipation efficiency. Also, the number of the first heat dissipating protrusions 261 may be increased or decreased according to the actual heat dissipation requirement. As shown in fig. 4, adjacent first heat dissipation protrusions 261 are arranged at intervals in the circumferential radial direction. In this embodiment, the main air duct 24 of the first friction disc 21 is provided with a first heat dissipating protrusion 261, and two first heat dissipating protrusions 261 are radially arranged along the circumference. The number of the first heat dissipating protrusions 261 is related to the heat dissipating requirement, and if the heat dissipating requirement generated by braking is large, the number of the first heat dissipating protrusions 261 arranged at intervals along the circumferential radial direction can be increased adaptively, and the purpose of heat exchange is achieved mainly by increasing the contact area of the increased first heat dissipating protrusions 261.

Specifically, as shown in fig. 5, the heat dissipating portion 26 further includes at least one second heat dissipating protrusion 262 disposed radially along the circumference on the second friction disk 22. And the adjacent second heat dissipation protrusions 262 are spaced apart in the circumferential radial direction. The second heat dissipating protrusions 262 are opposite to the first heat dissipating protrusions 261, and the number and the structure are completely the same. The second heat dissipating protrusions 262 are provided for the same purpose as the first heat dissipating protrusions 261, and are provided on the ventilation surfaces (211, 221) of the first and second friction disks 21, 22, respectively, which are disposed opposite to each other.

Specifically, in order to increase the contact area as much as possible, each of the first heat dissipation projection 261 and the second heat dissipation projection 262 has an arc-shaped heat dissipation surface (2611, 2621) that is projected by the ventilation surface (211, 221). The heat dissipating surfaces (2611, 2621) of the first heat dissipating protrusion 261 and the second heat dissipating protrusion 262 are both arc-shaped structures formed by the protrusions of the ventilation surfaces (211, 221), so that the area of the heat dissipating part 26 can be increased as much as possible on the premise that the number of the protrusions is increased, and the heat exchanging efficiency is improved.

Specifically, as shown in fig. 2, in the present embodiment, the height H3 of the heat dissipating surface 2621 from the ventilation surface 221 is less than or equal to 1/4 of the distance H4 between the two ventilation surfaces (211, 221). If the height H3 of the heat dissipating surface 2621 is too high, the cooling air circulation effect of the entire main duct 24 will be adversely affected, and the heat exchange effect inside the annular friction disk 20 will be adversely affected. If the height H3 of the heat dissipating surface 2621 is too small, the technical effect of increasing the contact area cannot be achieved, and the purpose of improving the heat exchange efficiency cannot be achieved. Therefore, when the height H3 between the heat dissipating surface 2621 and the ventilation surface 221 is 1/4 of the height H4 of the two ventilation surfaces (211, 221), the first heat dissipating protrusion 261 and the second heat dissipating protrusion 262 can achieve the best effect of increasing heat dissipation by taking both weight and heat dissipation efficiency into consideration.

In the present embodiment, the first heat dissipating projections 261 and the second heat dissipating projections 262 in the heat dissipating portion 26 are provided on the first friction disk 21 and the second friction disk 22, respectively, but both are the same in terms of the number of the arrangement, the direction of the arrangement, and the arrangement structure. And the intervals of the first heat dissipation projection 261 and the second heat dissipation projection 262 in the circumferential radial direction are also equal in width and interval. The heat dissipation portions 26 can be uniformly distributed along the ventilation surfaces (211, 221) throughout the annular friction disk 20, and the dynamic balance of the entire internally ventilated brake disk 100 is ensured. In addition, the arc-shaped structures of the first heat dissipating protrusion 261 and the second heat dissipating protrusion 262 are designed to increase the surface area of the first friction disk 21 and the second friction disk 22 contacting with the cold air in the main air duct 24 to the maximum, thereby effectively increasing the heat exchange rate and increasing the heat dissipating speed.

Further, as shown in fig. 2, in the brake disc 100 of the internally ventilated type according to the present invention, the support bracket 30 is used to connect the mounting disc 10 and the annular friction disc 20. Specifically, the support bracket 30 is used to connect the mounting plate 10 with the first friction plate 21 of the annular friction plate 20. The support bracket 30 includes a first support portion 31 disposed perpendicular to the outer circumference of the mounting plate 10 and a second support portion 32 extending from an end of the first support portion 31 to the inner circumference of the annular friction plate 20, and an included angle α formed between the first support portion 31 and the second support portion 32 is acute. In the present embodiment, the second support portion 32 extends from the end of the first support portion 31 to the inner circumference of the first friction disk 21. Preferably, the included angle α between the first supporting portion 31 and the second supporting portion 32 is 30 ° to 70 °. Thus, the included angle α can be used to offset the thermal deformation of the first friction disc 21 caused by thermal expansion and contraction during braking, so as to effectively suppress the deformation of the brake disc 100 caused by brake temperature increase.

The invention provides an internal ventilation type brake disc 100, wherein connecting parts 23 which are mutually spaced are arranged in an annular friction disc 20, a main air duct 24 which is communicated from the center of the annular friction disc 20 to the outer side is formed through the spaced connecting parts 23, the connecting parts 23 are arranged at intervals by a plurality of reinforcing ribs 231 to form side air ducts 25, the arrangement of the side air ducts 25 not only can realize the communication between the adjacent main air ducts 24, but also can reduce the whole weight of the annular friction disc 20 while meeting the connecting and supporting strength of a first friction disc 21 and a second friction disc 22, meet the requirement of the whole light weight design of the brake disc 100, and form cooling air which has larger flow and is beneficial to convection heat exchange through the communication between the side air ducts 25 arranged on the connecting parts 23 and the main air duct 24, increase the staying time of the cooling air in the annular friction disc 20, and greatly improve the heat radiation performance and the heat radiation efficiency in the, the heat generated by the external friction of the annular friction disc 20 can be dissipated by heat convection between the main air duct 24 and the side air duct 25, so that the temperature rise of the brake disc during the braking of the vehicle can be effectively improved.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.