A disc brake

Abstract

The embodiment of the application provides a disc brake, and relates to the technical field of brakes. The disc brake comprises a disc part, an air guide part and a brake caliper part. A first disc and a second disc are fixedly sleeved outside a shaft sleeve, and a ring shell is arranged between the first disc and the second disc. The first disc is provided with an air outlet hole in a side surface, and the second disc is provided with an air inlet hole in a side surface. An outer sleeve ring is rotatably sleeved outside the shaft sleeve, a plurality of groups of leaf plates are arranged in an annular array and are arranged in an inclined manner outside the outer sleeve ring, and a counterweight is fixed to the outer sleeve ring. The brake caliper part is located outside the disc part and brakes the first disc and the second disc. The air in a cavity formed by the first disc, the second disc and the ring shell flows rapidly due to the relative rotation of the leaf plates, that is, the air flows rapidly through the air outlet hole and the air inlet hole, the temperature on the first disc and the second disc can be rapidly taken out, and the first disc and the second disc are rapidly cooled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brake, in particular to a disc brake. BACKGROUND

[0002] The disc brake, also known as the disc brake, is a widely used brake system for vehicles, machines or equipment. The disc brake mainly consists of a brake caliper and a disc (brake pad) for mechanical equipment braking.

[0003] During frequent braking, the friction plate on the inner side of the caliper and the disc are rubbed for a long time, and the heat energy generated during friction cannot be quickly released, which easily causes the brake to appear heat recession phenomenon, affecting the braking quality and service life of the brake. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a disc brake to solve the problem that the disc brake in the related art is prone to heat recession phenomenon during frequent braking, which affects the braking quality and service life of the brake.

[0005] According to the disc brake of the present application, the disc brake comprises a disc portion, an air flow guiding portion and a brake caliper portion.

[0006] The disc portion comprises a shaft sleeve, a first disc, a second disc and a ring shell, the first disc and the second disc are fixedly sleeved on the outer side of the shaft sleeve, and the ring shell is arranged at the outer edge between the first disc and the second disc, the first disc side is provided with a plurality of air outlet holes, and the second disc side is provided with a plurality of air inlet holes;

[0007] The air flow guiding portion comprises a sleeve ring, a leaf plate and a counterweight, the sleeve ring is located between the first disc and the second disc, and the sleeve ring is rotatably sleeved on the outside of the shaft sleeve, a plurality of groups of the leaf plate are arranged in an annular array and inclined on the outer circle of the sleeve ring, and the counterweight is fixed on the outer circle of the sleeve ring;

[0008] The brake caliper portion is located outside the disc portion to brake the first disc and the second disc.

[0009] In some embodiments of the present application, the brake caliper part comprises a first caliper, a second caliper, a friction plate and an elastic support, the first caliper and the second caliper have the same structure, the second caliper is provided with an oil pressurizing cavity inside, the friction plate is slidably arranged inside the oil pressurizing cavity, and the elastic support elastically supports two groups of friction plates, the second caliper is provided with an oil inlet opening in communication with the oil pressurizing cavity outside, and a sealing member is arranged between the oil pressurizing cavity and the friction plate.

[0010] In some embodiments of the present application, the elastic support comprises a positioning bolt and a spring, the positioning bolt connects the first caliper and the second caliper, and the positioning bolt penetrates the friction plate, and the spring is sleeved outside the screw rod of the positioning bolt between the two friction plates.

[0011] In some embodiments of the present application, the brake caliper part further comprises a fixing bolt, the fixing bolt connects the first caliper and the second caliper.

[0012] In some embodiments of the present application, the first caliper and the second caliper are both provided with mounting holes matched with the fixing bolt and the positioning bolt outside.

[0013] In some embodiments of the present application, the first caliper and the second caliper are both provided with an arc-shaped avoiding slot for avoiding the shaft sleeve in the middle part.

[0014] In some embodiments of the present application, the air guiding part further comprises a plurality of groups of rolling balls, the rolling balls are rollingly arranged between the sleeve ring and the shaft sleeve.

[0015] In some embodiments of the present application, the shaft sleeve is provided with a groove outside, and the rolling balls are rollingly arranged inside the groove.

[0016] In some embodiments of the present application, the inner wall of the sleeve ring is provided with a ring groove, and the rolling balls roll inside the ring groove.

[0017] In some embodiments of the present application, the plurality of groups of air outlet holes are obliquely arranged outside the first disc, and the plurality of groups of air inlet holes are obliquely arranged outside the second disc.

[0018] The application has the beneficial effects that: the disc brake obtained by the above design can have good cooling effect on the first disc and the second disc in the air guiding part when the air flow circulates during braking of the brake caliper part and after braking and when the first disc and the second disc rotate again, the air in the cavity enclosed by the first disc, the second disc and the ring shell flows quickly due to the relative rotation of the leaf plates, that is, the air flows quickly through the air outlet hole and the air inlet hole, the temperature on the first disc and the second disc can be quickly taken out to realize quick cooling of the first disc and the second disc. When the air outside the first disc and the second disc flows through the air outlet hole and the air inlet hole, the air in the inside part of the brake caliper part also flows quickly, which has good cooling protection effect on the brake caliper part, that is, the disc brake has better cooling protection effect, so that the disc brake has a longer service life.

[0019] Additional aspects and advantages of the application will be set forth in part in the following description, will become apparent from the following description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments of the application. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 is a disc brake structure schematic diagram according to the embodiment of the application;

[0022] Figure 2 is a disc brake structure schematic diagram according to the embodiment of the application;

[0023] Figure 3 is a shaft sleeve, second disc, ring shell and air guiding part structure schematic diagram according to the embodiment of the application;

[0024] Figure 4 is a shaft sleeve structure schematic diagram according to the embodiment of the application;

[0025] Figure 5 is a sleeve ring and ball structure schematic diagram according to the embodiment of the application;

[0026] Figure 6 is a brake caliper part structure schematic diagram according to the embodiment of the application;

[0027] Figure 7 is a second caliper, elastic support, sealing element, oil pipe and heat dissipation fin structure schematic diagram according to the embodiment of the application;

[0028] Figure 8 is a schematic view of a second caliper and oil pipe mounting structure according to an embodiment of the present application;

[0029] Figure 9 is a schematic view of a seal structure according to an embodiment of the present application;

[0030] Figure 10 is a schematic view of a seal cross-sectional structure according to an embodiment of the present application.

[0031] Figure:

[0032] 10 - disc portion; 110 - shaft sleeve; 120 - first disc; 130 - second disc; 140 - ring shell; 150 - air outlet hole; 160 - air inlet hole; 170 - groove; 20 - air guide portion; 210 - outer sleeve ring; 220 - blade plate; 230 - counterweight; 240 - ball; 250 - ring groove; 30 - brake caliper portion; 310 - first caliper; 311 - fixing bolt; 320 - second caliper; 321 - oil liquid pressurizing cavity; 322 - oil liquid return cavity; 323 - flow-through groove; 330 - friction plate; 340 - elastic support; 341 - positioning bolt; 342 - spring; 350 - seal; 351 - sealing ring; 352 - middle flange; 353 - side flange; 354 - first groove; 355 - second groove; 360 - oil injection port; 370 - oil pipe; 380 - heat dissipation blade; 391 - first oil port; 392 - second oil port. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0036] A disc brake according to an embodiment of the present application will be described below with reference to the drawings.

[0037] Referring to Figures 1-10 The disc brake according to the embodiment of the application comprises a disc part 10, an air flow guiding part 20 and a brake caliper part 30.

[0038] The brake caliper part 30 cooperates with the disc part 10 to complete braking, and the cooperation of the air flow guiding part 20 and the disc part 10 can realize rapid cooling of the brake, that is, the heat generated by friction is rapidly diffused outward, the occurrence of heat fading is reduced, the brake is better protected, and the brake can have a longer service life in long-term use.

[0039] Referring to Figures 1-3 The disc part 10 comprises a shaft sleeve 110, a first disc 120, a second disc 130 and a ring shell 140. The first disc 120 and the second disc 130 are fixedly sleeved outside the shaft sleeve 110, and the shaft sleeve 110, the first disc 120 and the second disc 130 are fixed by welding. The ring shell 140 is arranged at an outer edge between the first disc 120 and the second disc 130, and the ring shell 140 is fixedly arranged between the first disc 120 and the second disc 130 by bolts or welding. The first disc 120 is provided with a plurality of air outlet holes 150 on a side surface, and the second disc 130 is provided with a plurality of air inlet holes 160 on a side surface. The air flow guiding part 20 comprises a sleeve ring 210, a leaf plate 220 and a counterweight 230. The sleeve ring 210 is located between the first disc 120 and the second disc 130, and the sleeve ring 210 is rotatably sleeved outside the shaft sleeve 110. A plurality of groups of leaf plates 220 are arranged in an annular array and inclined outside the sleeve ring 210, and the counterweight 230 is fixed outside the sleeve ring 210. The brake caliper part 30 is located outside the disc part 10 and brakes the first disc 120 and the second disc 130.

[0040] The working principle of the disc brake is that when the brake caliper part 30 brakes the first disc 120 and the second disc 130 on both sides of the disc part 10, the shaft sleeve 110, the first disc 120 and the second disc 130 are synchronously changed from a rotating state to a stationary state, and when the brake caliper part 30 no longer brakes the first disc 120 and the second disc 130, the shaft sleeve 110, the first disc 120 and the second disc 130 are again in a rotating state. During the rotation of the shaft sleeve 110, the first disc 120 and the second disc 130, the leaf plate 220 outside the outer sleeve ring 210 and the counterweight 230 are in a stationary state or a relatively slow rotating state due to the rotating arrangement between the outer sleeve ring 210 in the air guide part 20 and the shaft sleeve 110. That is, the first disc 120 and the second disc 130 outside the shaft sleeve 110 rotate relative to the leaf plate 220 outside the outer sleeve ring 210. Under the guidance of the inclined leaf plate 220 outside the outer sleeve ring 210, the outside air enters the cavity enclosed by the first disc 120, the second disc 130 and the ring shell 140 through the air inlet hole 160 on the side of the second disc 130, and the gas inside the cavity flows out through the air outlet hole 150 on the outside of the first disc 120. This air flow can effectively cool the first disc 120 and the second disc 130 in the air guide part 20 when the brake caliper part 30 brakes and when the first disc 120 and the second disc 130 rotate after braking. The relative rotation of the leaf plate 220 causes the air in the cavity enclosed by the first disc 120, the second disc 130 and the ring shell 140 to flow rapidly, i.e. the air flows rapidly through the air outlet hole 150 and the air inlet hole 160, and the temperature on the first disc 120 and the second disc 130 can be quickly taken out to achieve rapid cooling of the first disc 120 and the second disc 130. The first disc 120 and the second disc 130 are effectively cooled and protected.

[0041] When the air outside the first disc 120 and the second disc 130 flows through the air outlet hole 150 and the air inlet hole 160, it will also cause the air in the inner part of the brake caliper part 30 to flow rapidly, which effectively cools and protects the brake caliper part 30, i.e. the brake itself is better cooled and protected, and the disc brake has a longer service life.

[0042] In the above specific embodiments, please refer to Figures 6-8The brake caliper part 30 comprises a first caliper 310, a second caliper 320, a friction plate 330 and an elastic support 340, and the first caliper 310 and the second caliper 320 have the same structure specification. That is, the first caliper 310 and the second caliper 320 have the same specification, and the brake caliper part 30 is divided into left and right parts. The second caliper 320 is provided with an oil pressurizing cavity 321 on the inner side, the friction plate 330 is slidably arranged in the oil pressurizing cavity 321, and the elastic support 340 elastically supports the two groups of friction plates 330. The second caliper 320 is provided with an oil inlet 360 which is in communication with the oil pressurizing cavity 321, and the oil pressurizing cavity 321 and the friction plate 330 are provided with a sealing element 350.

[0043] In this embodiment, oil is pressurized into the oil pressurizing cavity 321 in the second caliper 320 through the oil inlet 360, the oil in the oil pressurizing cavity 321 is pressurized, and the pressurized oil in the oil pressurizing cavity 321 presses the friction plate 330 close to the first disc 120 and the second disc 130 in the disc part 10, until the friction plate 330 contacts the first disc 120 and the second disc 130, thereby achieving the function of friction braking. When the two friction plates 330 press the first disc 120 and the second disc 130 close to each other, the elastic support 340 is also pressed. When the oil pressure in the oil pressurizing cavity 321 decreases, the two friction plates 330 move away from each other under the elastic support of the elastic support 340, that is, a gap is re-established between the friction plate 330 and the first disc 120 and the second disc 130, and the shaft sleeve 110, the first disc 120 and the second disc 130 can rotate normally again.

[0044] Further, the elastic support 340 comprises a positioning bolt 341 and a spring 342. The positioning bolt 341 connects the first caliper 310 and the second caliper 320, and the positioning bolt 341 penetrates the friction plate 330, and the spring 342 is sleeved on the outer portion of the screw rod of the positioning bolt 341 between the two friction plates 330. The positioning bolt 341 is used for connecting the first caliper 310 and the second caliper 320, and at the same time, the positioning bolt 341 is also used for limiting the two friction plates 330. The spring 342 on the outer portion of the positioning bolt 341 is used for elastically supporting the two friction plates 330, that is, for elastic support and reset of the friction plate 330.

[0045] Specifically, the brake caliper part 30 further comprises a fixing bolt 311, and the fixing bolt 311 connects the first caliper 310 and the second caliper 320. The outer sides of the first caliper 310 and the second caliper 320 are provided with mounting holes matched with the fixing bolt 311 and the positioning bolt 341. The fixing bolt 311 penetrates the mounting holes on the first caliper 310 and the second caliper 320 to fixedly connect the first caliper 310 and the second caliper 320, that is, to achieve detachable fixed installation of the first caliper 310 and the second caliper 320.

[0046] In the specific setting, the first caliper 310 and the second caliper 320 are provided with arc-shaped avoiding grooves for avoiding the shaft sleeve 110. The end of the shaft sleeve 110 is located inside the arc-shaped avoiding grooves.

[0047] In the above specific embodiments, please refer to Figure 4 and Figure 5 The air guiding part 20 further comprises a plurality of balls 240, which are arranged in a rolling manner between the outer sleeve ring 210 and the shaft sleeve 110. A plurality of elastic supports 340 are arranged in a ring array outside the shaft sleeve 110, which reduces the friction generated by the rotation between the outer sleeve ring 210 and the shaft sleeve 110, so that the rotation between the outer sleeve ring 210 and the shaft sleeve 110 is more lubricated.

[0048] Further, the shaft sleeve 110 is provided with a groove 170 on the outside, and the balls 240 are arranged in a rolling manner inside the groove 170. The inner wall of the outer sleeve ring 210 is provided with a ring groove 250, and the balls 240 roll inside the ring groove 250. The arrangement of the groove 170 and the ring groove 250 can improve the stability of the balls 240 when rolling, that is, the balls 240 can roll more stably between the outer sleeve ring 210 and the shaft sleeve 110.

[0049] Specifically, a plurality of air outlet holes 150 are arranged on the outside of the first disc 120, and a plurality of air inlet holes 160 are arranged on the outside of the second disc 130. The arrangement of the plurality of air outlet holes 150 and the plurality of air inlet holes 160 can make the air flow more easily along the air outlet holes 150 and the air inlet holes 160 when rotating.

[0050] The above-mentioned disc brake can improve the overall cooling effect of the brake by improving the air flow performance under the cooperation of rotating the outer sleeve ring 210 and the leaf plate 220. If the cooling effect of the disc brake can be further improved, the disc brake will have better cooling protection effect.

[0051] In the above specific embodiments, please refer to Figures 6-8 The brake caliper part 30 further comprises an oil pipe 370 and a heat dissipation fin 380. The second caliper 320 is provided with an oil return cavity 322 inside the lower section, and the second caliper 320 is provided with a first oil port 391 and a second oil port 392 which are in communication with the oil return cavity 322. The second caliper 320 is provided with a plurality of heat dissipation fins 380 which are distributed radially along the shaft sleeve 110 inside the lower section. The heat dissipation fins 380 inside the first caliper 310 and the second caliper 320 are integrally formed. The heat dissipation fins 380 are provided with a flow channel 323 which is in communication with the oil return cavity 322, and the oil pipe 370 is in communication with the oil inlet 360 and the second oil port 392 at both ends.

[0052] In this embodiment, the oil return cavity 322 in the first caliper 310 and the second caliper 320 is located below after the brake is installed. The externally pressurized oil enters the oil return cavity 322 through the first oil port 391, and the overpressure oil in the oil return cavity 322 enters the oil pressurizing cavity 321 through the oil pipe 370 and the oil injection port 360. The oil pressure in the oil pressurizing cavity 321 is raised to press the friction plate 330 on one side, and the friction plate 330 pressed will be in contact with the first disc 120 and the second disc 130 to generate friction to achieve the effect of braking.

[0053] When the friction plate 330 is in contact with the first disc 120 and the second disc 130 to generate friction and brake, the heat generated can be quickly absorbed by the oil in the flow-through groove 323 inside the heat dissipation fin 380, and finally the oil in the flow-through groove 323 mixes with the oil in the oil return cavity 322, that is, the heat absorbed by the heat dissipation fin 380 can be quickly conducted to the oil in the oil return cavity 322 to achieve the effect of rapid cooling. When the oil pressure in the oil pressurizing cavity 321 decreases, the oil in the oil pressurizing cavity 321 enters the oil return cavity 322 through the oil injection port 360 and the oil pipe 370, and the oil in the oil return cavity 322 is replaced by oil at a lower temperature, which can quickly conduct the heat absorbed by the heat dissipation fin 380, that is, it can further improve the cooling effect. When the oil in the oil pressurizing cavity 321 enters the oil return cavity 322 through the oil injection port 360 and the oil pipe 370, the oil in the oil return cavity 322 that has absorbed heat is discharged through the first oil port 391 to the oil pump system for cooling, and when the oil in the oil pump system is pumped into the oil return cavity 322 after cooling, it will have a lower temperature, which can make the heat dissipation fin 380 have a better absorption and cooling effect, and even in frequent braking, the disc brake also has a better cooling and braking effect. While the heat dissipation fin 380 quickly absorbs heat with the oil in the oil return cavity 322, the subsequently rotating shaft sleeve 110, first disc 120 and second disc 130 will also drive the inner sleeve ring 210 and leaf plate 220 to rotate, and the rotating leaf plate 220 generates a rapid air flow, which can further improve the cooling efficiency of the brake by cooperating with the heat dissipation fin 380 and the oil in the oil return cavity 322 to cool the brake. Even if the brake is frequently braked to generate more heat, the disc brake can also be quickly cooled.

[0054] In addition to the rotating sleeve ring 210, the leaf plate 220 can conduct heat with the circulating air and the oil liquid in the oil liquid return cavity 322 to reduce the temperature. The rotating leaf plate 220 also makes the air flow quickly around the air outlet hole 150 and the air inlet hole 160 on the side of the first disc 120 and the second disc 130. At this time, the quickly flowing air will contact the heat dissipation blades 380 inside the first caliper 310 and the second caliper 320. The air flows quickly around the heat dissipation blades 380, which also quickly disperses the heat in the heat dissipation blades 380, that is, quickly cools the heat in the heat dissipation blades 380 and the oil liquid in the oil liquid return cavity 322, improves the cooling speed of the heat dissipation blades 380 and the oil liquid return cavity 322, and realizes further improvement of the cooling effect of the disc brake, so that the disc brake has a better service life.

[0055] The sealing element 350 provided in the oil liquid pressurizing cavity 321 in the first caliper 310 and the second caliper 320 in the above-mentioned disc brake is a common sealing gasket. In the long-term use of the brake, the sealing effect between the second caliper 320 and the friction plate 330 is poor, and the oil liquid is prone to leak from the gap between the sealing gasket and the friction plate 330 and the first caliper 310 and the second caliper 320.

[0056] In the specific setting, please refer to Figure 7 , Figure 9 and Figure 10 The sealing element 350 includes a sealing ring 351, a middle flange 352 is provided in the middle part of the outer ring of the sealing ring 351, and a side flange 353 is provided on both sides of the outer ring of the sealing ring 351. Among them, the sealing ring 351, the middle flange 352 and the side flange 353 are integrally formed. The first groove 354 is provided in the inside of the sealing ring 351, and the second groove 355 is provided in the inner wall of the middle flange 352 and is connected with the first groove 354.

[0057] This embodiment is: compared with the traditional sealing gasket, the sealing ring 351 is provided with the side flange 353 and the middle flange 352 in an alternating manner, so that the peripheral area of the sealing ring 351 has a better sealing effect. After the oil liquid enters the oil liquid pressurizing cavity 321 through the oil inlet 360, the oil liquid in the oil liquid pressurizing cavity 321 is tightly pressed in the first groove 354 and the second groove 355, and the oil pressure at the side wall of the first groove 354 and the oil pressure at the side wall and the bottom wall of the second groove 355 make the outer wall of the sealing ring 351 more tightly contact with the contact surface, that is, the oil liquid in the oil liquid pressurizing cavity 321 is pressurized, and the sealing effect of the sealing element 350 is improved, so that the sealing element 350 can have a better sealing effect.

[0058] The side flange 353 is a pyramid-shaped structure that protrudes outward, and multiple groups of side flanges 353 are arranged to further improve the sealing effect of the sealing element 350, so that the oil in the disc brake has a better sealing effect when pressurized.

[0059] The above merely provides an embodiment of the present application, and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0060] The above merely provides an embodiment of the present application, and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings. The above merely provides an embodiment of the present application, and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

Claims

1. A disc brake, characterized by The utility model relates to a disc brake, which comprises: a disc part (10) comprising a shaft sleeve (110), a first disc (120), a second disc (130) and a ring shell (140), the first disc (120) and the second disc (130) are fixedly sleeved outside the shaft sleeve (110), and the ring shell (140) is arranged at the outer edge between the first disc (120) and the second disc (130), a plurality of air outlet holes (150) are arranged on the side of the first disc (120), and a plurality of air inlet holes (160) are arranged on the side of the second disc (130); an air guide part (20) comprising a sleeve ring (210), a blade (220) and a counterweight (230), the sleeve ring (210) is located between the first disc (120) and the second disc (130), and the sleeve ring (210) is rotatably sleeved outside the shaft sleeve (110), a plurality of groups of the blades (220) are arranged in an annular array and inclined outside the sleeve ring (210), and the counterweight (230) is fixed outside the sleeve ring (210); a brake caliper part (30) located outside the disc part (10) and braking the first disc (120) and the second disc (130), the brake caliper part (30) comprises a first caliper (310), a second caliper (320), a friction plate (330) and an elastic support (340), the first caliper (310) and the second caliper (320) are the same in structure and specification, an oil pressurizing cavity (321) is arranged on the inner side of the second caliper (320), the friction plate (330) is slidably arranged on the inner side of the oil pressurizing cavity (321), the elastic support (340) elastically supports the two groups of friction plates (330), an oil inlet (360) in communication with the oil pressurizing cavity (321) is arranged on the outer side of the second caliper (320), and a sealing member (350) is arranged between the oil pressurizing cavity (321) and the friction plate (330). The brake caliper part (30) further comprises an oil pipe (370) and a heat dissipation vane (380), the second caliper (320) lower section is internally provided with an oil return cavity (322), the second caliper (320) is externally provided with a first oil port (391) and a second oil port (392) in communication with the oil return cavity (322), the second caliper (320) lower section is internally provided with a plurality of groups of heat dissipation vanes (380) distributed radially along the shaft sleeve (110), the heat dissipation vanes (380) are internally provided with a flow-through groove (323) in communication with the oil return cavity (322), the oil pipe (370) is communicatively arranged at both ends with the oil injection port (360) and the second oil port (392), the externally pressurized oil enters the oil return cavity (322) through the first oil port (391), the overpressure oil in the oil return cavity (322) enters the oil pressurizing cavity (321) through the oil pipe (370) and the oil injection port (360), the oil pressure in the oil pressurizing cavity (321) is raised to press the friction plate (330) on one side, the pressed friction plate (330) is in contact with the first disc (120) and the second disc (130) to generate friction and brake; The sealing member (350) comprises a sealing ring (351), the sealing ring (351) is provided with a middle flange (352) in the middle of the outer ring, the sealing ring (351) is provided with a side flange (353) on both sides of the outer ring, the sealing ring (351) is internally provided with a first groove (354), and the inner wall of the middle flange (352) is provided with a second groove (355) in communication with the first groove (354).

2. A disc brake according to claim 1, wherein The elastic support member (340) comprises a positioning bolt (341) and a spring (342), the positioning bolt (341) is connected with the first caliper (310) and the second caliper (320), and the positioning bolt (341) penetrates the friction plate (330), and the spring (342) is sleeved on the outer rod of the positioning bolt (341) between the two friction plates (330).

3. A disc brake according to claim 2, wherein The brake caliper part (30) further comprises a fixing bolt (311), and the fixing bolt (311) is connected with the first caliper (310) and the second caliper (320).

4. A disc brake according to claim 3, wherein The first caliper (310) and the second caliper (320) are both provided with mounting holes matched with the fixing bolt (311) and the positioning bolt (341) on the outer sides.

5. A disc brake according to claim 1, wherein The first caliper (310) and the second caliper (320) are provided with arc-shaped avoiding grooves for avoiding the shaft sleeve (110) in the middle.

6. A disc brake according to claim 1, wherein The air guiding part (20) further comprises a plurality of groups of rolling balls (240) arranged between the sleeve ring (210) and the shaft sleeve (110).

7. A disc brake according to claim 6, wherein The shaft sleeve (110) is provided with a groove (170) on the outer side, and the rolling balls (240) are arranged in the groove (170).

8. A disc brake according to claim 7, wherein The inner wall of the sleeve ring (210) is provided with a ring groove (250), and the rolling balls (240) roll in the ring groove (250).

9. A disc brake according to claim 1, wherein The plurality of groups of air outlet holes (150) are arranged obliquely on the outside of the first disc (120), and the plurality of groups of air inlet holes (160) are arranged obliquely on the outside of the second disc (130).

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