A ventilated brake disc with heat dissipation structure

Abstract

The present invention belongs to the technical field of disc brakes, and specifically relates to a ventilated brake disc with a heat dissipation structure, comprising two outer discs and a heat dissipation structure arranged between the two outer discs. The specific heat dissipation structure comprises a plurality of heat dissipation ribs, which are distributed in a circular array between the two outer discs, the lower side of the heat dissipation ribs is fixedly connected to one outer disc, the upper side is in contact with the other outer disc, and a ventilation channel is formed between two adjacent heat dissipation ribs; the cross-sectional outer contour of the heat dissipation ribs comprises an upper arc, a lower arc, an inner arc and an outer arc; the concave portions of the upper arc and the lower arc are in the same direction, the inner arc is located on the side of the lower arc and the upper arc close to the center of the outer disc, the outer arc is located on the side of the lower arc and the upper arc away from the center of the outer disc, and the width of the inner arc is smaller than the width of the outer arc. Thus, by setting a plurality of heat dissipation ribs, the effective heat dissipation area of ​​the brake disc is increased, the efficiency of convective heat exchange is promoted, the heat dissipation effect is significantly improved, and heat accumulation is suppressed.

Description

Technical Field

[0001] The invention belongs to the technical field of disc brakes, and in particular relates to a ventilated brake disc with a heat dissipation structure. Background Art

[0002] The design of the ventilated brake disc heat dissipation ribs plays a vital role in improving the thermal management performance of the brake system, especially under high-frequency braking conditions, where its heat dissipation performance is crucial to the overall stability of the system. During the braking process, if the large amount of heat generated by friction cannot be dissipated in time, it may cause the brake disc to overheat, which in turn causes thermal decay, significantly affecting braking performance and safety.

[0003] At present, the common types of brake disc cooling ribs on the market include straight rib type, curved surface type and column type. Straight rib cooling ribs will produce an air recirculation area on one side of the flow channel, making it difficult for hot air to be discharged in time in the flow channel. Although the curved surface type can ensure the best air flow performance, its structure is consistent with the air flow direction, resulting in the inability of boundary layer fluid to flow separation, and heat accumulates in the boundary layer. Due to the long fluid outflow path of the curved flow channel structure, the heat dissipation performance cannot reach the optimal level. Although the columnar cooling ribs can cause fluid disturbance, its air pumping efficiency is far lower than the previous two, and the heat dissipation effect is not good. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a ventilated brake disc with a heat dissipation structure. Through the structural design of multiple heat dissipation ribs, the effective heat dissipation area of ​​the brake disc is increased, the air flow channel is optimized, and the efficiency of convective heat exchange is promoted, thereby significantly improving the heat dissipation effect and inhibiting heat accumulation.

[0005] The technical solution of the present invention is:

[0006] A ventilated brake disc with a heat dissipation structure comprises two disc-shaped outer discs and a heat dissipation structure arranged between the two outer discs, wherein the heat dissipation structure comprises:

[0007] A plurality of heat dissipation ribs are distributed in a circular array between the two outer disks, the lower side of the heat dissipation rib is fixedly connected to one outer disk, the upper side is in contact with the other outer disk, and a ventilation channel is formed between two adjacent heat dissipation ribs;

[0008] The outer contour of the cross section of the heat dissipation rib includes an upper arc, a lower arc, an inner arc and an outer arc; the upper arc is in the same direction as the concave portion of the lower arc, the inner arc is located on the side of the lower arc and the upper arc close to the center of the outer disk, the outer arc is located on the side of the lower arc and the upper arc away from the center of the outer disk, and the width of the inner arc is smaller than the width of the outer arc.

[0009] Preferably, the number of the heat dissipation ribs is 64-72.

[0010] Preferably, the contour curve equation of the upper arc is:

[0011] S.R. 1 sin(θ 1 +5n)=a 0 +a 1 cos(w 1 S.R. 1 cos(θ 1 +5n))+b 1 sin(w 1 S.R. 1 cos(θ 1 +5n))

[0012] +a 2 cos(2w 1 S.R. 1 cos(θ 1 +5n))+b 2 sin(2w 1 S.R. 1 cos(θ 1 +5n))

[0013] The contour curve equation of the lower arc is:

[0014] S.R. 2 sin(θ 2 +5n)=a 3 +a 4 cos(w 2 S.R. 2 cos(θ 2 +5n))+b 3 sin(S·R 2 cos(θ 2 +5n)w 2 )

[0015] +a 5 cos(2w 2 S.R. 2 cos(θ 2 +5n))+b 3 sin(2w 2 S.R. 2 cos(θ 2 +5n))

[0016] +a 6 cos(3w 2 S.R. 2 cos(θ 2 +5n))+b 4sin(3w 2 S.R. 2 cos(θ 2 +5n))

[0017] Where: S is the scaling factor, and the calculation formula is R 0 is the reference radius of the inner annular surface of the outer disk; R is the inner annular surface radius of the outer disk design structure; R 1 , R 2 are the distances from a point on the upper arc and the lower arc to the pole respectively; θ 1 ,θ 2 are the angles formed by the polar axis and the lines connecting a point on the upper arc and a point on the lower arc; a i , i=0,1,2…,6;b j , j = 1, 2…, 5; a i and b j are the Fourier coefficients corresponding to the Fourier series fitting curve; w 1 , w 2 is the coefficient value corresponding to the Fourier series fitting curve; n is the number of heat dissipation ribs.

[0018] Preferably, the ratio of the width of the inner arc to the width of the outer arc of the heat dissipation rib is in the range of 1:1.5-1:3.

[0019] Preferably, the width of the ventilation channel between two adjacent heat dissipation ribs is equal at any position along the length direction.

[0020] Preferably, the number of the heat dissipation ribs is 64-72.

[0021] Preferably, a claw structure is further provided between the two outer disks, and the claw structure is located inside the circular ring formed by the plurality of heat dissipation ribs, and is used to provide a stable heat dissipation space for the heat dissipation ribs, and the claw structure includes:

[0022] A fixing ring, detachably connected to the two outer disks, and the axes of the fixing ring and the outer disks coincide with each other;

[0023] A plurality of connecting claws are fixed in a circular array on the outer circumferential surface of the fixing ring, and a spacing is provided between the side of the connecting claw away from the fixing ring and the inner arc of the heat dissipation rib.

[0024] Preferably, the side of the connecting claw facing the inner arc is an arc surface, the distance between the center of the arc surface and the outer disk is 176mm-180mm, and the radius of the arc surface is 16.5mm-17mm.

[0025] Preferably, the value range of the angle α between the line connecting the two adjacent sides of two adjacent connecting claws and the center of the center hole is 15.6° to 16°.

[0026] Preferably, the width b of the bottom surface of the connecting claw ranges from 56.5 mm to 57.8 mm.

[0027] Preferably, the number n of the connecting claws is calculated as follows:

[0028]

[0029] Wherein: N is the number of connecting claws 7; β is the arc length corresponding to the specified angle α on the inner annular surface of the design structure of the outer disk 5; b is the bottom width of the connecting claw 7; and R is the radius of the inner annular surface of the design structure of the outer disk 5.

[0030] Compared with the prior art, the ventilated brake disc with a heat dissipation structure of the present invention has the following features:

[0031] Beneficial effects:

[0032] 1. The device uses a plurality of heat dissipation ribs arranged in an array on the inner circumference of the outer disc to increase the effective heat dissipation area of ​​the brake disc. At the same time, the outer arc of the heat dissipation rib is larger than the width of the inner arc, and the structural design of the ventilation channel with equal width between two adjacent heat dissipation ribs can ensure uniform heat dissipation. During the braking process, the heat on the outer side of the outer disc is quickly transferred to the ventilation channel. Since the curved surface structure of the outer arc area has a large contact area with the air, the heat can be dissipated into the air more effectively, the air flow channel is optimized, and the efficiency of convective heat exchange is promoted, thereby significantly improving the heat dissipation effect, inhibiting heat accumulation, and achieving better heat dissipation effect.

[0033] 2. The device forms multiple ventilation channels of equal width between multiple heat dissipation ribs arranged in a circular array. The equal-width ventilation channel structure greatly reduces the air recirculation area, thereby improving the heat dissipation performance near the outer area;

[0034] 3. This device utilizes the geometric structure design of the heat dissipation ribs to further help reduce the risk of thermal fatigue and thermal deformation and extend the service life of the heat dissipation ribs. Its application provides important guarantees for improving the thermal stability and overall safety of the braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a cross-sectional view of a heat dissipation rib in an embodiment of the present invention;

[0036] Figure 2 It is a cross-sectional view of a connecting claw in an embodiment of the present invention;

[0037] Figure 3It is a schematic diagram of the overall structure of a ventilated brake disc with a heat dissipation structure in an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Upper arc; 2. Lower arc; 3. Inner arc; 4. Outer arc; 5. Outer disk; 6. Heat dissipation ribs; 7. Connecting claws; 8. Center hole. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0042] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] See also Figures 1 to 3 As shown, in order to increase the effective heat dissipation area of ​​the brake disc, optimize the air flow channel, promote the efficiency of convective heat exchange, significantly improve the heat dissipation effect, inhibit heat accumulation, and thus increase the service life of the brake disc. This embodiment provides a ventilated brake disc with a heat dissipation structure, including two disc-shaped outer discs 5 and a heat dissipation structure arranged between the two outer discs 5. Specifically, the present application further optimizes the heat dissipation structure, and the optimized heat dissipation structure includes a plurality of heat dissipation ribs 6, and the plurality of heat dissipation ribs 6 are distributed in a circumferential array between the two outer discs 5. The lower side of the heat dissipation rib 6 is fixedly connected to one outer disc 5, and the upper side is in contact with the other outer disc 5, and a ventilation channel is formed between two adjacent heat dissipation ribs 6; the cross-sectional outer contour of the heat dissipation rib 6 of the preferred design includes an upper arc 1, a lower arc 2, an inner arc 3 and an outer arc 4; the concave portions of the upper arc 1 and the lower arc 2 are in the same direction, the inner arc 3 is located on the side of the lower arc 2 and the upper arc 1 close to the center of the outer disc 5, and the outer arc 4 is located on the side of the lower arc 2 and the upper arc 1 away from the center of the outer disc 5, and the width of the inner arc 3 is less than the width of the outer arc 4.

[0044] See also Figure 1As shown, further, in order to improve the heat dissipation effect of the heat dissipation rib 6, the size structure of the heat dissipation rib 6 between the two outer disks 5 needs to be optimized. Specifically, a center hole 8 is opened on the outer disk 5, and the side wall of the center hole 8 is the inner annular surface of the outer disk 5. The reference radius of the inner annular surface of the outer disk 5 is R 0 , the inner annular radius of the outer disk 5 design structure is R, then the dimensional parameters of the heat dissipation rib 6 are calculated as follows:

[0045] The polar coordinate equation is established with the center of the inner annular surface of the outer disk 5 as the origin, and the contour curves of the upper arc 1 and the lower arc 2 are fitted by Fourier series to obtain:

[0046] The contour curve equation of the upper arc 1 is:

[0047] S.R. 1 sin(θ 1 +5n)=a 0 +a 1 cos(w 1 S.R. 1 cos(θ 1 +5n))+b 1 sin(w 1 S.R. 1 cos(θ 1 +5n))

[0048] +a 2 cos(2w 1 S.R. 1 cos(θ 1 +5n))+b 2 sin(2w 1 S.R. 1 cos(θ 1 +5n))

[0049] The contour curve equation of the lower arc 2 is:

[0050] S.R. 2 sin(θ 2 +5n)=a 3 +a 4 cos(w 2 S.R. 2 cos(θ 2 +5n))+b 3 sin(S·R 2 cos(θ 2 +5n)w 2 )

[0051] +a 5 cos(2w 2 S.R.2 cos(θ 2 +5n))+b 3 sin(2w 2 S.R. 2 cos(θ 2 +5n))

[0052] +a 6 cos(3w 2 S.R. 2 cos(θ 2 +5n))+b 4 sin(3w 2 S.R. 2 cos(θ 2 +5n))

[0053] Where: S is the scaling factor, and the calculation formula is R 0 is the reference radius of the inner annular surface of the outer disk; R is the inner annular surface radius of the outer disk design structure; a 0 =(297.56~298.43); a 1 =(349.98~356.74); a 2 =(72.53~73.64); a 3 =(1.319e10~1.321e10); a 4 =(1.957e10~1.959e10); a 5 =(7.532e9~7.534e9); a 6 =(1.173e9~1.175e9); b 1 =(135.74~137.42); b 2 =(62.17~63.21); b 3 =(3.161e9~3.163e9); b 4 =(2.467e9~2.469e9); b 5 =(6.116e8~6.118e8); w 1 =0.01021; w 2 =0.0006467,θ 1 =(3.795~6.209);θ 2 =(5.997~6.964); n=i(i=1,2,3...,72);

[0054] Where: R 1 , R 2 are the distances from a point on the upper arc 1 and the lower arc 2 to the pole, θ 1 ,θ2 are the angles formed by the polar axis and the line connecting a point on the upper arc 1 and a point on the lower arc 2, respectively. i (i=0,1,2……,6) and b j (j=1,2……,5 are the Fourier coefficients corresponding to the Fourier series fitting curve, w 1 , w 2 is the value of the coefficient corresponding to the Fourier series fitting curve, and n is the number of heat dissipation ribs. Thus, by optimizing the design of the upper arc 1 and the lower arc 2 of the heat dissipation rib, a structure of the heat dissipation rib 6 that is more in line with the size of the outer disk 5 can be designed, which is convenient for improving the heat dissipation effect of the heat dissipation rib 6 during the application process.

[0055] Furthermore, in order to improve the heat dissipation effect, the number of heat dissipation ribs 6 between the two outer plates 5 is recommended to be 64-72, so as to better control the width of the ventilation channel between two adjacent heat dissipation ribs 6 and achieve the best heat dissipation effect.

[0056] Furthermore, in order to improve the heat dissipation effect, in the process of calculating the contour curves of the upper arc 1 and the lower arc 2, the width ratio of the inner arc 3 of the heat dissipation rib 6 to the outer arc 4 is controlled in the range of 1:1.5-1:3.

[0057] See also Figure 1 and Figure 3 As shown, further, in order to improve the heat dissipation effect, the width of the ventilation channel between two adjacent heat dissipation ribs 6 is equal at any position along the length direction, thereby ensuring the uniformity of heat dissipation on the outer disk 5, which can better disperse the heat and flow more evenly, and achieve better heat dissipation effect.

[0058] See also Figure 2 and Figure 3 As shown, further, in order to improve the heat dissipation effect, a claw structure is also provided between the two outer disks 5. The claw structure is located on the inner side of the circular ring formed by a plurality of heat dissipation ribs 6. On the one hand, it is used to support the two outer disks 5, and on the other hand, it is used to provide a stable heat dissipation space for the heat dissipation ribs 6, so that the internal heat can be better diffused and the internal heat accumulation is avoided. Specifically, the claw structure includes a fixed ring and a plurality of connecting claws 7. The fixed ring is detachably connected to the two outer disks 5, and the axis of the fixed ring coincides with the axis of the outer disk 5; a plurality of connecting claws 7 are fixed in a circular array on the outer circumferential surface of the fixed ring, and a spacing is provided between the side of the connecting claw 7 away from the fixed ring and the inner arc 3 of the heat dissipation rib 6. The design of the connecting claw 7 can make the internal heat more evenly dispersed during the rotation of the outer disk 5.

[0059] Furthermore, in order to improve the heat dissipation effect, the side of the connecting claw 7 facing the inner arc 3 is an arc surface, the distance between the arc surface and the outer disk 5 is 176mm-180mm, and the radius of the arc surface is 16.5mm-17mm. In addition, in the design, the radius from the inner arc 3 of the heat dissipation rib 6 to the center of the center hole 8 is controlled to be 189-252mm, and the radius from the outer arc 4 to the center of the center hole 8 is controlled to be 283.5-378mm, so as to maintain a certain distance between the arc of the connecting claw 7 and the inner arc 3 of the heat dissipation rib 6, which not only avoids the friction between the heat dissipation rib 6 and the connecting claw 7, but also ensures that the internal heat can flow stably.

[0060] Furthermore, in order to improve the heat dissipation effect, the angle between the adjacent sides of two adjacent connecting claws 7 and the center of the center hole 8 is ɑ, and the value range of ɑ is controlled to be 15.6° to 16°. The value range of the bottom width b of the connecting claw 7 is set to be 56.5mm to 57.8mm.

[0061] See also Figure 2 and Figure 3 As shown, further, based on the reference of the above numerical values, the number n of the connecting claws 7 is calculated as follows: Assuming the number of the connecting claws 7 is N, the arc length corresponding to the angle α on the inner ring surface of the outer disk 5 design structure is β and the sum of the bottom width b of the connecting claw 7 is the width of the upper single heat dissipation rib 6 of the outer disk 5 design structure and its adjacent ventilation channel, and the inner ring surface radius of the outer disk 5 design structure is R, then

[0062]

[0063] Specifically, the present invention provides a method for using a ventilated brake disc with a heat dissipation structure in practical applications. First, a corresponding center hole 8 and surrounding bolt holes are opened in the center of the two outer discs 5 to install the entire ventilated brake disc with a heat dissipation structure on the shaft or wheel hub. During the braking process, the brake caliper needs to apply pressure to the surface of the outer disc 5 to generate friction, that is, the brake caliper and the outer disc 5 are rubbed to achieve the braking effect. In order to reduce the friction heat generated during the braking process that affects the braking efficiency and safety performance. By utilizing the curved surface structure of the heat dissipation rib 6 at the inner arc 3, the pump air inlet (i.e., the area of ​​the ventilation channel close to the center hole 8) guides the airflow into the ventilation channel, and by utilizing the parallel inclined structure of the middle and rear ends (the middle and rear ends, i.e., the structure of the heat dissipation rib 6 extends along the inner diameter to the outer diameter direction of the center hole 8, and its radial length interval is between 1 / 3 of the total radial length and the outermost end) to slightly deflect the rotating airflow in the rotating direction, the mass flow rate of the airflow in the ventilation channel can be increased compared with the traditional straight rib structure, and the flow channel structure formed by the equal width spacing of the two heat dissipation ribs 6 in this ventilation channel greatly reduces the air recirculation area, and the heat dissipation performance is improved near the outer area. In addition, due to the structural characteristics of the outer disk 5, the linear velocity near the outer arc 4 of the outer disk 5 is higher than that of the inner arc, and the high-temperature area of ​​the annular temperature zone generated by the friction temperature rise is close to the outer side. Therefore, in order to ensure uniform heat dissipation, the inner section of the design structure (i.e., the structure of the heat dissipation rib 6 extends along the inner radial direction of the center hole 8 to the outer radial direction, and its radial length interval is between the innermost end and 1 / 3 of the total radial length) and the outer section (i.e., the structure of the heat dissipation rib 6 extends along the inner radial direction of the center hole 8 to the outer radial direction, and its radial length interval is between 2 / 3 of the total radial length to the outermost end) are designed.

[0064] The mass flow rate of the airflow is increased in the ventilation channel, and then the air recirculation area is greatly reduced by using the ventilation channel structure with equal width compared with the traditional straight rib structure, so that the heat dissipation performance is improved in the area close to the outside. In addition, due to the circular structural characteristics of the outer disc 5, the linear velocity of the part close to the outside is higher than that of the inside, and the high temperature area of ​​the annular temperature zone generated by the friction temperature rise is close to the outside. At this time, the width structure design of the outer arc 4 of the heat dissipation rib 6 is greater than that of the inner arc 3, which can ensure the uniformity of heat dissipation. During the braking process, the heat in the outer part of the outer disc 5 is quickly transferred to the ventilation channel. Since the curved surface structure of the outer arc 4 area has a large contact area with the air, the heat can be more effectively dissipated into the air. In order to ensure the strength and rigidity requirements of the connection between the outer disc 5 and the shaft end structure while being able to pump more air into the ventilation channel, a claw structure with multiple connecting claws 7 is further adopted inside the ventilated brake disc with a heat dissipation structure. This can not only disperse the internal heat more evenly during the rotation of the outer disc 5, but also support and connect the two outer discs 5 to ensure the rationality of the internal space. At the same time, this design ensures the structural strength and rigidity requirements of the disc body while achieving lightweight brake discs.

[0065] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A ventilated brake disc with a heat dissipation structure, comprising two disc-shaped outer discs (5) and a heat dissipation structure arranged between the two outer discs (5), characterized in that: The heat dissipation structure comprises: A plurality of heat dissipation ribs (6) are distributed in a circular array between the two outer disks (5), the lower side of the heat dissipation rib (6) is fixedly connected to one outer disk (5), the upper side is in contact with the other outer disk (5), and a ventilation channel is formed between two adjacent heat dissipation ribs (6); The cross-sectional outer contour of the heat dissipation rib (6) comprises an upper arc (1), a lower arc (2), an inner arc (3) and an outer arc (4); the upper arc (1) is in the same direction as the concave portion of the lower arc (2); the inner arc (3) is located on the side of the lower arc (2) and the upper arc (1) close to the center of the outer disk (5); the outer arc (4) is located on the side of the lower arc (2) and the upper arc (1) away from the center of the outer disk (5); and the width of the inner arc (3) is smaller than the width of the outer arc (4); The contour curve equation of the upper arc (1) is: The contour curve equation of the lower arc (2) is: Where: S is the scaling factor, and the calculation formula is R0 is the reference radius of the inner annular surface of the outer disk (5); R is the inner annular surface radius of the design structure of the outer disk (5); R1 and R2 are the distances from a point on the upper arc (1) and the lower arc (2) to the pole respectively; θ1 and θ2 are the angles formed by the polar axis and the line connecting a point on the upper arc (1) and the lower arc (2); a i , i=0,1,2…,6; b j , j = 1, 2…, 5; a i and b j are the Fourier coefficients corresponding to the Fourier series fitting curve; w1 and w2 are the coefficient values ​​corresponding to the Fourier series fitting curve; n is the number of heat dissipation ribs.

2. A ventilated brake disc with a heat dissipation structure according to claim 1, characterized in that: The width ratio of the inner arc (3) and the outer arc (4) of the heat dissipation rib (6) is in the range of 1:1.5-1:

3.

3. The ventilated brake disc with heat dissipation structure according to claim 1, characterized in that: The width of the ventilation channel between two adjacent heat dissipation ribs (6) is equal at any position along the length direction.

4. The ventilated brake disc with heat dissipation structure according to claim 1, characterized in that: The number of the heat dissipation ribs (6) is 64 to 72.

5. The ventilated brake disc with heat dissipation structure according to claim 1, characterized in that: A claw structure is also provided between the two outer disks (5), and the claw structure is located inside the circular ring formed by the plurality of heat dissipation ribs (6) and is used to provide a stable heat dissipation space for the heat dissipation ribs (6). The claw structure comprises: A fixing ring, detachably connected to the two outer disks (5), wherein the axes of the fixing ring and the outer disks (5) coincide with each other; A plurality of connection claws (7) are fixed in a circular array on the outer circumferential surface of the fixing ring, and a spacing is provided between the side of the connection claws (7) away from the fixing ring and the inner arc (3) of the heat dissipation rib (6).

6. A ventilated brake disc with a heat dissipation structure according to claim 5, characterized in that: The side of the connecting claw (7) facing the inner arc (3) is an arc surface, the distance between the center of the arc surface and the outer disk (5) is 176mm-180mm, and the radius of the arc surface is 16.5mm-17mm.

7. The ventilated brake disc with a heat dissipation structure according to claim 5, characterized in that: The value range of the angle α between the line connecting the two adjacent sides of two adjacent connecting claws (7) and the center of the central hole (8) is 15.6° to 16°.

8. The ventilated brake disc with heat dissipation structure according to claim 7, characterized in that: The value range of the bottom width b of the connecting claw (7) is 56.5 mm to 57.8 mm.

9. The ventilated brake disc with heat dissipation structure according to claim 8, characterized in that: The number of the connecting claws (7) is determined by the following formula: Where: N is the number of connecting claws (7); β is the arc length corresponding to the specified angle α on the inner annular surface of the design structure of the outer disc (5), b is the bottom width of the connecting claw (7), and R is the radius of the inner annular surface of the design structure of the outer disc (5).

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