CN218367746U - Brake cooling device - Google Patents

Abstract

The utility model provides a brake cooling device, include: the supporting shaft is internally provided with a cavity; the brake disc is rotatably sleeved at one end of the supporting shaft, and a circulating channel is arranged in the brake disc; the rotating shaft is arranged in the cavity and comprises a fixed section rotating shaft and a moving section rotating shaft, a fixed liquid inlet channel and a fixed liquid outlet channel are formed in the fixed section rotating shaft, a liquid inlet connecting groove and a liquid outlet connecting groove are formed in the end part of the fixed section rotating shaft, the inner diameter of the liquid inlet connecting groove is larger than that of the fixed liquid inlet channel, the inner diameter of the liquid outlet connecting groove is larger than that of the fixed liquid outlet channel, and a moving liquid inlet channel and a moving liquid outlet channel are formed in the moving section rotating shaft in a penetrating mode; the air cylinder is arranged in the cavity and is used for driving the rotating shaft of the moving section to be close to or far away from the rotating shaft of the fixed section; and the fluid box forms a closed cooling passage with the rotating shaft and the brake disc through the fluid pipeline. The utility model discloses there is the deviation slightly when can not aim at because of removing section pivot and canned paragraph pivot, just lead to the cooling channel not unblocked and influence the cooling effect.

Description

Brake cooling device

Technical Field

The utility model relates to a brake equipment technical field, concretely relates to brake cooling device.

Background

The brake disc is an important part of a motor vehicle during braking, and the braking performance of the brake disc directly influences the driving safety. The existing brake disc is provided with a heat dissipation channel, a plurality of heat dissipation holes are formed in the surface of the brake disc, but the air flow in the channel is small, the air inflow of air holes formed in the surface of the brake disc is insufficient, the heat dissipation area is limited, and the heat dissipation efficiency is limited. Especially, when a large-sized load-carrying vehicle or an automobile runs at a high speed for a long time, the inertia of the vehicle is large, the temperature of the edge of the brake disc can rise rapidly due to severe friction between the brake pad or the brake combination piece and the steel disc, so that the temperature of the whole brake system can rise dramatically, when the brake disc turns red due to overhigh temperature, the brake pad or the brake combination piece of the brake system can be burnt, the brake effect can be greatly reduced, and the running safety is influenced.

In order to improve the braking effect, the temperature of the braking system is reduced by spraying cooling water to the braking system. Although this method can provide a certain effect, it brings a series of new problems, for example, because of the long-time water spraying, the excessive water spraying spreads over the road where the car runs, which causes a hidden trouble to other vehicles, and if the road surface is ice and snow, the serious degree of the slip phenomenon is increased, and the environment is polluted.

The conventional brake cooling system is provided with a fluid box, and a closed brake disc water-cooling passage is formed by an inlet fluid pipeline, an outlet fluid pipeline, a rotating shaft and a brake disc, so that the mode of spraying cooling water can be replaced to reduce the temperature of the brake disc, and the potential safety hazard caused by spraying the cooling water to other vehicles can be avoided. However, in the communication process of the water-cooling passage of the brake disc, the two ends of the originally separated passage need to be aligned with each other in the communication operation between the passages, the requirement on the alignment precision is high, and once deviation occurs, the water-cooling passage of the brake disc can not be smooth, so that the cooling effect of the brake disc is influenced. Accordingly, there is a need to provide a brake cooling device that solves the above-mentioned problems of the prior art.

Disclosure of Invention

In view of this, the present invention provides a brake cooling device to solve the problems existing in the background art.

In order to solve the technical problem, the utility model provides a brake cooling device, include:

the supporting shaft is internally provided with a cavity;

the brake disc is rotatably sleeved at one end of the supporting shaft, and a circulating channel is arranged in the brake disc;

the rotating shaft is arranged in the cavity and comprises a fixed section rotating shaft and a moving section rotating shaft, one end of the fixed section rotating shaft is sleeved in the brake disc, the moving section rotating shaft is positioned on one side, away from the brake disc, of the fixed section rotating shaft, a fixed liquid inlet channel and a fixed liquid outlet channel are formed in the fixed section rotating shaft and are respectively communicated with two ends of the circulating channel, a liquid inlet connecting groove communicated with the fixed liquid inlet channel and a liquid outlet connecting groove communicated with the fixed liquid outlet channel are formed in the end portion of the fixed section rotating shaft, the inner diameter of the liquid inlet connecting groove is larger than that of the fixed liquid inlet channel, the inner diameter of the liquid outlet connecting groove is larger than that of the fixed liquid outlet channel, and a moving liquid inlet channel matched with the liquid inlet connecting groove and a moving liquid outlet channel matched with the liquid outlet connecting groove are formed in the moving section rotating shaft in a penetrating manner;

the air cylinder is arranged in the cavity and used for driving the rotating shaft of the moving section to be close to or far away from the rotating shaft of the fixed section;

the fluid tank is used for containing cooling fluid, and a closed cooling passage is formed by the fluid tank and the movable liquid inlet channel, the movable liquid inlet connecting groove, the fixed liquid inlet channel, the circulating channel, the fixed liquid outlet channel, the liquid outlet connecting groove and the movable liquid outlet channel through a fluid pipeline.

Further, the cylinder includes one end and back shaft fixed connection's piston rod, forms reciprocating motion's cylinder body with the piston rod, the one end embedding of fixed section pivot is kept away from in the removal section pivot the inside seal structure that forms of cylinder body, be equipped with the jar water seal piece of three interval arrangement between the inner wall of removal section pivot and cylinder body, be equipped with the open end that removes into liquid pore and remove liquid pore on the lateral wall of the removal section pivot that corresponds between two liang of jar water seal pieces respectively, the open end that removes into liquid pore and remove liquid pore passes through fluid pipeline and is connected with the fluid tank.

Furthermore, three brake water sealing parts which are arranged at intervals are arranged between the fixed section rotating shaft and the inner wall of the brake disc, and the outer side wall of the fixed section rotating shaft corresponding to every two brake water sealing parts is respectively provided with an opening end for fixing a liquid inlet channel and an opening end for fixing a liquid outlet channel.

Further, the cylinder body of the air cylinder is connected with the electromagnetic air valve to control the reciprocating movement of the cylinder body.

Furthermore, an electromagnetic valve for controlling cooling fluid to flow out is arranged on the fluid pipeline, the electromagnetic valve is electrically connected with the electromagnetic air valve, and a delay relay is arranged on the fluid pipeline between the fluid tank and the electromagnetic valve.

Furthermore, the brake disc comprises a disc body, a central hole penetrates through the disc body, a spiral radiating duct which surrounds the central hole is arranged in the disc body, an annular groove is respectively arranged on the peripheral surface of the central hole corresponding to the inlet end and the outlet end of the radiating duct, and the radiating duct is communicated with the two annular grooves.

Furthermore, the spiral diameter of the heat dissipation pore canal is increased and then reduced along the axial direction of the disc body, the diameters of the two annular grooves are the same, and the spiral distances of the heat dissipation pore canal are the same.

The above technical scheme of the utility model at least include following beneficial effect:

1. the cylinder is used for driving the movable section rotating shaft to be close to or far away from the fixed section rotating shaft, so that the purpose of controlling whether the fluid tank forms a closed cooling passage with the movable liquid inlet duct, the liquid inlet connecting groove, the fixed liquid inlet duct, the circulating channel, the fixed liquid outlet duct, the liquid outlet connecting groove and the movable liquid outlet duct through the fluid pipeline is achieved, the mode of spraying cooling water can be replaced to reduce the temperature of the brake disc, and potential safety hazards caused by spraying cooling water to other vehicles can be avoided; the end part of the fixed section rotating shaft is provided with a liquid inlet connecting groove communicated with the fixed liquid inlet pore passage and a liquid outlet connecting groove communicated with the fixed liquid outlet pore passage, and the moving section rotating shaft is provided with a moving liquid inlet pore passage matched with the liquid inlet connecting groove and a moving liquid outlet pore passage matched with the liquid outlet connecting groove in a penetrating way, so that the moving liquid inlet pore passage can be communicated with the fixed liquid inlet connecting groove only by communicating with the liquid outlet connecting groove only (the moving liquid outlet pore passage only needs to be communicated with the liquid outlet connecting groove), the aim of communicating the moving liquid inlet pore passage with the fixed liquid inlet pore passage (the moving liquid outlet pore passage and the fixed liquid outlet pore passage) can be achieved, and the cooling effect on the brake disc cannot be influenced because the cooling passage cannot be smooth because the inner diameter of the liquid inlet connecting groove is larger than the inner diameter of the fixed liquid outlet pore passage, the requirement on alignment accuracy is reduced, and a small deviation is avoided when the brake disc is aligned;

2. the delay relay is arranged on the fluid pipeline between the fluid tank and the electromagnetic valve, the cooling passage is started when the vehicle treads the brake for a certain time, and the brake cooling device cannot be started due to the brake during normal running, so that the cooling effect when the vehicle needs to be braked for a long time is ensured.

Drawings

FIG. 1 is a schematic structural diagram of a brake cooling device according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of another state of the brake cooling device according to the embodiment of the present invention;

FIG. 3 is a schematic structural view of a brake disc according to an embodiment of the present invention;

FIG. 4 isbase:Sub>A schematic cross-sectional view taken along the line A-A in FIG. 3;

FIG. 5 is a perspective view of a brake disc according to an embodiment of the present invention;

FIG. 6 is an exploded view of the brake disc and the fixed section rotating shaft in the embodiment of the present invention;

fig. 7 is a schematic structural view of a fixed-section rotating shaft in the embodiment of the present invention;

fig. 8 is a schematic sectional view along the direction F-F in fig. 7.

In the figure:

1. and a brake disc; 11. a heat dissipation pore channel; 12. an annular groove; 13. a tray body;

2. a rotating shaft; 21. a moving section rotating shaft; 22. the fixed section rotating shaft; 23. fixing the liquid inlet pore channel; 24. fixing the liquid outlet channel; 25. a seal ring; 26. a liquid inlet connection groove; 27. a liquid outlet connecting groove;

3. a cylinder; 31. a cylinder body; 32. a piston rod;

4. an electromagnetic gas valve; 5. an electromagnetic valve;

6. a fluid tank; 7. a support shaft; 8. a fluid conduit.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings 1 to 8 of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the present invention, belong to the protection scope of the present invention.

A brake cooling apparatus, comprising:

the supporting shaft 7 is provided with a cavity inside;

the brake disc 1 is rotatably sleeved at one end of the supporting shaft 7, and a circulating channel is arranged in the brake disc 1;

the rotating shaft 2 is arranged in the cavity, the rotating shaft 2 comprises a fixed section rotating shaft 22 and a moving section rotating shaft 21, one end of the fixed section rotating shaft 22 is sleeved in the brake disc 1, the moving section rotating shaft 21 is located on one side, far away from the brake disc 1, of the fixed section rotating shaft 22, a fixed liquid inlet channel 23 and a fixed liquid outlet channel 24 are formed in the fixed section rotating shaft 22 and are respectively communicated with two ends of the circulating channel, a liquid inlet connecting groove 26 communicated with the fixed liquid inlet channel 23 and a liquid outlet connecting groove 27 communicated with the fixed liquid outlet channel 24 are formed in the end portion of the fixed section rotating shaft 22, the inner diameter of the liquid inlet connecting groove 26 is larger than the inner diameter of the fixed liquid inlet channel 23, the inner diameter of the liquid outlet connecting groove 27 is larger than the inner diameter of the fixed liquid outlet channel 24, and a moving liquid inlet channel matched with the liquid inlet connecting groove 26 and a moving liquid outlet channel matched with the liquid outlet connecting groove 27 penetrate through the moving section rotating shaft 21;

the cylinder 3 is arranged in the cavity, and the cylinder 3 is used for driving the moving section rotating shaft 21 to be close to or far away from the fixed section rotating shaft 22;

the fluid tank 6 is used for containing cooling fluid, and the fluid tank 6 forms a closed cooling passage with the movable liquid inlet channel, the liquid inlet connecting groove 26, the fixed liquid inlet channel 23, the circulating channel, the fixed liquid outlet channel 24, the liquid outlet connecting groove 27 and the movable liquid outlet channel through the fluid pipeline 8.

Specifically, as shown in fig. 1 to 8, the brake cooling device includes a support shaft 7 arranged in a horizontal direction, and a cavity is opened in the support shaft 7 to penetrate through the support shaft 7 in the horizontal direction. The right end of the supporting shaft 7 is rotatably sleeved with a brake disc 1, and a circulating channel is formed in the brake disc 1. The rotating shaft 2 is installed in the cavity of the supporting shaft 7 along the horizontal direction, the rotating shaft 2 comprises a fixed section rotating shaft 22 with the right end sleeved in the brake disc 1 and a moving section rotating shaft 21 positioned on the left side of the fixed section rotating shaft 22, the fixed section rotating shaft 22 is provided with a fixed liquid inlet hole channel 23 and a fixed liquid outlet hole channel 24 which are respectively communicated with two ends of the circulating channel, the left end surface of the fixed section rotating shaft 22 is provided with a liquid inlet connecting groove 26 communicated with the fixed liquid inlet hole channel 23 and a liquid outlet connecting groove 27 communicated with the fixed liquid outlet hole channel 24, the inner diameter of the liquid inlet connecting groove 26 is larger than that of the fixed liquid inlet hole channel 23, the inner diameter of the liquid outlet connecting groove 27 is larger than that of the fixed liquid outlet hole channel 24, and the moving section rotating shaft 21 is provided with a moving liquid inlet hole channel matched with the liquid inlet connecting groove 26 and a moving liquid outlet hole channel matched with the liquid outlet connecting groove 27 in a penetrating manner. The air cylinder 3 is further arranged in the cavity of the supporting shaft 7, the rod fixing plate is arranged in the cavity of the supporting shaft 7, the air cylinder 3 is arranged between the fixing plate and the moving section rotating shaft 21, and the air cylinder 3 is used for driving the moving section rotating shaft 21 to be close to or far away from the fixing section rotating shaft 22. The cooling device also comprises a fluid tank 6, wherein the fluid tank 6 is used for containing cooling fluid, and the fluid tank 6 forms a closed cooling passage with the movable liquid inlet pore channel, the liquid inlet joint groove 26, the fixed liquid inlet pore channel 23, the circulating channel, the fixed liquid outlet pore channel 24, the liquid outlet joint groove 27 and the movable liquid outlet pore channel through two fluid pipelines 8.

The utility model discloses simple structure, convenient to use, cylinder 3 are used for driving removal section pivot 21 to be close to or keep away from fixed section pivot 22 to reach the purpose that whether control fluid case 6 constitutes closed cooling circuit through fluid pipeline 8 and removal income liquid pore, income liquid linkage groove 26, fixed income liquid pore 23, circulation channel, fixed liquid pore 24, play liquid linkage groove 27, removal liquid pore, can replace the mode that adopts spray cooling water to reduce brake disc 1 temperature, can avoid the potential safety hazard that causes for other vehicles because of spray cooling water; the end of the fixed section rotating shaft 22 is provided with a liquid inlet connecting groove 26 communicated with the fixed liquid inlet channel 23 and a liquid outlet connecting groove 27 communicated with the fixed liquid outlet channel 24, and the moving section rotating shaft 21 is provided with a moving liquid inlet channel matched with the liquid inlet connecting groove 26 and a moving liquid outlet channel matched with the liquid outlet connecting groove 27 in a penetrating way, so that the moving liquid inlet channel can be communicated with the fixed liquid inlet channel 23 (the moving liquid outlet channel only needs to be communicated with the liquid outlet connecting groove 27) only by communicating with the liquid inlet connecting groove 26. And because the inner diameter of the liquid inlet connecting groove 26 is larger than that of the fixed liquid inlet channel 23, and the inner diameter of the liquid outlet connecting groove 27 is larger than that of the fixed liquid outlet channel 24, the requirement on alignment accuracy is lowered, and the influence on the cooling effect of the brake disc 1 caused by the fact that the cooling passage of the brake disc 1 is not smooth due to slight deviation in alignment is avoided.

According to the utility model discloses an embodiment, as shown in fig. 1-8, cylinder 3 includes left end and fixed plate fixed connection's piston rod 32, be connected with the right-hand member of piston rod 32 and form reciprocating motion's cylinder body 31, the left end embedding cylinder body 31 of removal section pivot 21 is inside and form seal structure, install three interval arrangement's jar water seal between the inner wall of removal section pivot 21 and cylinder body 31, set up the open end that removes income liquid pore and remove liquid pore on the lateral wall of removal section pivot 21 that corresponds between two liang of jar water seals respectively, the open end that removes income liquid pore and removes liquid pore is connected with fluid tank 6 through a fluid pipeline 8 respectively. Three brake water sealing parts which are arranged at intervals are arranged between the fixed section rotating shaft 22 and the inner wall of the brake disc 1, and the outer side wall of the fixed section rotating shaft 22 corresponding to every two brake water sealing parts is respectively provided with an opening end for fixing a liquid inlet channel 23 and an opening end for fixing a liquid outlet channel 24. The brake disc 1 comprises a disc body 13, a central hole penetrates through the disc body 13, a spiral radiating duct 11 arranged around the central hole is arranged in the disc body 13, annular grooves 12 are respectively formed in the peripheral surfaces of the central hole corresponding to the inlet end and the outlet end of the radiating duct 11, and the radiating duct 11 is communicated with the two annular grooves 12. A sealing ring 25 is installed on the circumferential wall of the shaft body corresponding to the annular groove 12 to prevent fluid from flowing out from the matching part of the disc body 13 and the fixed section rotating shaft 22. The spiral diameter of the heat dissipation duct 11 increases and then decreases along the axial direction of the disc body 13, the diameters of the two annular grooves 12 are the same, and the spiral distances of the heat dissipation duct 11 are the same. Under the condition of unchanging pitch, the contact surface of the spiral radiating pore canal 11 can be enlarged, the heat conduction efficiency is high, and the cooling effect on the disk body 13 is greatly improved.

According to another embodiment of the present invention, as shown in fig. 1-2, the cylinder 31 of the cylinder 3 is connected with the solenoid valve 4 to control the reciprocating movement of the cylinder 31. The fluid pipeline 8 is provided with an electromagnetic valve 5 for controlling the cooling fluid to flow out, the electromagnetic valve 5 is electrically connected with the electromagnetic air valve 4, and the fluid pipeline 8 between the fluid box 6 and the electromagnetic valve 5 is provided with a delay relay. The cooling channel is started only when the vehicle treads the brake for a certain time, and the brake cooling device can not be started due to the brake during normal running, so that the cooling effect when the vehicle needs to brake for a long time is ensured.

The utility model discloses a theory of operation: when the brake is needed, the brake pedal is stepped on, and at this time, the electromagnetic gas valve 4 and the delay relay are opened, so that the air is inflated in the air cylinder 3, and the cylinder 31 is pushed by the gas to move rightwards until the moving section rotating shaft 21 is contacted with the fixed section rotating shaft 22. The purpose of communicating the movable liquid inlet duct with the fixed liquid inlet duct 23 (the movable liquid outlet duct with the fixed liquid outlet duct 24) can be achieved only by communicating the movable liquid inlet duct with the liquid inlet joining groove 26 (the movable liquid outlet duct with the liquid outlet joining groove 27), because the inner diameter of the movable liquid inlet duct with the fixed liquid inlet duct 23 is larger than that of the fixed liquid inlet duct 23, and the inner diameter of the liquid outlet joining groove 27 is larger than that of the fixed liquid outlet duct 24, the requirement on alignment accuracy is reduced, and the influence on the cooling effect of the brake disc 1 due to the fact that the brake disc 1 is not unblocked due to slight deviation in alignment is avoided. After a few seconds the solenoid valve 5 is opened and the fluid in the fluid reservoir 6 flows through the fluid conduit 8 into the moving section rotating shaft 21, the fixed section rotating shaft 22 and the brake disc 1 and forms a circulation loop. When the brake is released, the electromagnetic gas valve 4 and the electromagnetic valve 5 are closed, and the cylinder 31 moves left under the pushing of the gas until the moving section rotating shaft 21 is separated from (not contacted with) the fixed section rotating shaft 22.

In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate medium, and may be used for communicating the inside of two elements or for interacting with each other, unless otherwise specifically defined, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to the specific circumstances.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (7)

1. A brake cooling apparatus, comprising:

the supporting shaft (7), wherein a cavity is arranged inside the supporting shaft (7);

the brake disc (1) is rotatably sleeved at one end of the supporting shaft (7), and a circulating channel is arranged in the brake disc (1);

the rotating shaft (2) is arranged in the cavity, the rotating shaft (2) comprises a fixed section rotating shaft (22) and a moving section rotating shaft (21), one end of the fixed section rotating shaft (22) is sleeved in the brake disc (1), the moving section rotating shaft (21) is located on one side, far away from the brake disc (1), of the fixed section rotating shaft (22), a fixed liquid inlet channel (23) and a fixed liquid outlet channel (24) which are communicated with two ends of the circulating channel respectively are formed in the fixed section rotating shaft (22), a liquid inlet connecting groove (26) communicated with the fixed liquid inlet channel (23) and a liquid outlet connecting groove (27) communicated with the fixed liquid outlet channel (24) are formed in the end portion of the fixed section rotating shaft (22), the inner diameter of the liquid inlet connecting groove (26) is larger than that of the fixed liquid inlet channel (23), the inner diameter of the liquid outlet connecting groove (27) is larger than that of the fixed liquid outlet channel (24), and a moving liquid inlet channel matched with the liquid inlet connecting groove (26) and a moving channel matched with the liquid outlet connecting groove (27) are formed in the moving section rotating shaft (21) in a penetrating manner;

the air cylinder (3), the air cylinder (3) is arranged in the cavity, and the air cylinder (3) is used for driving the rotating shaft (21) of the moving section to be close to or far away from the rotating shaft (22) of the fixed section;

the fluid tank (6) is used for containing cooling fluid, and the fluid tank (6) forms a closed cooling passage with the movable liquid inlet channel, the liquid inlet connecting groove (26), the fixed liquid inlet channel (23), the circulating channel, the fixed liquid outlet channel (24), the liquid outlet connecting groove (27) and the movable liquid outlet channel through the fluid pipeline (8).

2. The brake cooling device according to claim 1, wherein the cylinder (3) comprises a piston rod (32) with one end fixedly connected with the support shaft (7) and a cylinder body (31) forming reciprocating motion with the piston rod (32), one end of the moving section rotating shaft (21) far away from the fixed section rotating shaft (22) is embedded into the cylinder body (31) to form a sealing structure, three cylinder water sealing members arranged at intervals are arranged between the moving section rotating shaft (21) and the inner wall of the cylinder body (31), the outer side wall of the moving section rotating shaft (21) corresponding to every two cylinder water sealing members is respectively provided with an opening end of a moving liquid inlet channel and an opening end of a moving liquid outlet channel, and the opening ends of the moving liquid inlet channel and the moving liquid outlet channel are connected with the fluid tank (6) through a fluid pipeline (8).

3. The brake cooling device according to claim 1, wherein three brake water sealing members arranged at intervals are arranged between the fixed section rotating shaft (22) and the inner wall of the brake disc (1), and the outer side wall of the fixed section rotating shaft (22) corresponding to every two brake water sealing members is respectively provided with an opening end for fixing the liquid inlet channel (23) and an opening end for fixing the liquid outlet channel (24).

4. Brake cooling arrangement according to claim 1, characterized in that the cylinder (31) of the cylinder (3) is connected to an electromagnetic gas valve (4) for controlling the reciprocating movement of the cylinder (31).

5. The brake cooling device according to claim 4, characterized in that the fluid pipeline (8) is provided with an electromagnetic valve (5) for controlling the outflow of cooling fluid, the electromagnetic valve (5) is electrically connected with the electromagnetic air valve (4), and the fluid pipeline (8) between the fluid tank (6) and the electromagnetic valve (5) is provided with a delay relay.

6. The brake cooling device according to claim 1, wherein the brake disc (1) comprises a disc body (13), a central hole is formed in the disc body (13) in a penetrating manner, a spiral heat dissipation duct (11) is arranged in the disc body (13) and surrounds the central hole, an annular groove (12) is respectively formed in the peripheral surface of the central hole corresponding to the inlet end and the outlet end of the heat dissipation duct (11), and the heat dissipation duct (11) is communicated with the two annular grooves (12).

7. Brake cooling arrangement according to claim 6, characterised in that the diameter of the spiral of the heat dissipating duct (11) increases first and then decreases in the axial direction of the disc (13), the diameter of the two annular grooves (12) being the same and the pitch of the spiral of the heat dissipating duct (11) being the same.

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