Hydraulic disc brake

Abstract

The utility model belongs to the technical field of hydraulic disc brakes, and particularly relates to a hydraulic disc brake which comprises a brake body, a hydraulic cylinder is assembled in the middle of the side wall of the brake body, the output end of the hydraulic cylinder is fixedly connected with a first piston plate, and a brake master cylinder is arranged between the hydraulic cylinder and the brake body. The first piston plate slides in the brake master cylinder, a plurality of first air vents are formed in the middle of the side wall of the brake body, and the wheel cylinder can be fixed in the brake body through the step, so that a brake disc in the wheel cylinder is not prone to falling off from the brake body in the braking process; by means of the technical scheme, the situation that the brake effect is reduced due to shaking or instability of the wheel cylinders is reduced, the stable wheel cylinders can enable the brake friction blocks to be pressed on the brake disc at constant pressure, hydraulic signals or mechanical force can be transmitted more effectively, it is guaranteed that the brake disc can respond to brake instructions rapidly, and the brake stability and reliability are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of hydraulic disc brake, specifically a kind of hydraulic disc brake. BACKGROUND

[0002] Hydraulic disc brake is a kind of high-performance brake device, widely used in automobile, motorcycle, electric two-wheeled vehicle, all-terrain vehicle and large and medium-sized mechanical equipment such as belt conveyor, large inclination angle on the transport equipment field.

[0003] Hydraulic disc brake is also known as electric hydraulic arm disc brake, and its working principle is based on hydraulic transmission, when driver steps on brake pedal, the oil in brake master cylinder generates pressure, and this pressure is transmitted to wheel cylinder through brake oil pipe, wheel cylinder will push piston to move, so that piston drives brake disc to brake wheel.

[0004] In long time use and observation, it is found that in the process of using hydraulic disc brake to brake wheel, brake disc is not fixed in brake and shakes or deviates, thereby reducing driving safety.

[0005] Therefore, the utility model provides a kind of hydraulic disc brake. UTILITY MODEL CONTENTS

[0006] In order to make up for the deficiency of prior art, solve at least one problem raised in the background art, a kind of hydraulic disc brake is proposed.

[0007] The utility model discloses a hydraulic disc brake, including the brake body, the brake body lateral wall middle part is equipped with the hydraulic cylinder, the hydraulic cylinder output is fixedly connected with the first piston board, be equipped with brake master cylinder between the hydraulic cylinder and brake body, the first piston board slides in brake master cylinder inside, a plurality of first air vents are seted up in the brake body lateral wall middle part, the brake body inner lateral wall middle part is seted up with the first brake oil pipe, the brake body inner lateral wall middle part is equipped with the clamping subassembly, the clamping subassembly is located in the first brake oil pipe inside, the brake body lateral wall middle part is slidably connected with a pair of wheel cylinder, the wheel cylinder lateral wall middle part is seted up with the second air vent, the wheel cylinder lateral wall middle part is seted up with the second brake oil pipe, brake master cylinder, first air vent, first brake oil pipe, second air vent and second brake oil pipe are hollow and are communicated, a plurality of first springs are fixedly connected with in the wheel cylinder inner lateral wall middle part, the first spring is located in the second brake oil pipe inside, the other end of first spring is fixedly connected with the second piston board, the second piston board slides in the second brake oil pipe inside, the second piston board lateral wall middle part is fixedly connected with the brake disc, the wheel cylinder inner lateral wall middle part is equipped with the positioning subassembly, the brake body inner lateral wall middle part is equipped with the limiting subassembly, the brake body lateral wall middle part is equipped with the cleaning subassembly, the clamping subassembly includes a pair of movable rod, the movable rod slides on the brake body lateral wall, the movable rod end is fixedly connected with the limiting board, the limiting board is located in the brake body outside, the brake body inner lateral wall middle part is fixedly connected with a pair of second springs, the second spring and movable rod are correspondingly seted up, the second spring and movable rod end are all assembled with the first fixed block, one side first fixed block and brake body between fixedly connected with third spring, the first fixed block lateral wall middle part is rotatably connected with a plurality of second fixed blocks, the second fixed block lateral wall middle part is rotatably connected with a plurality of third fixed blocks, the third fixed block lateral wall middle part is rotatably connected with a plurality of fourth fixed blocks, through this step can wheel cylinder be fixed in brake body inside, make the brake disc in the wheel cylinder inside not easily fall off from brake body in the braking process, reduce the brake effect drop condition due to the wheel cylinder's sway or instability, and the stable wheel cylinder can make brake friction block press on the brake disc with constant pressure, thereby can more effectively transmit hydraulic signal or mechanical force, thereby guarantee brake disc can respond brake instruction quickly, improve the stability and reliability of braking.

[0008] Preferably, the limiting assembly comprises a plurality of fixing protrusions fixed on the wheel cylinder side wall, a plurality of first grooves are formed in the middle part of the inner side wall of the brake body, the first grooves and the fixing protrusions are correspondingly arranged, a second groove is formed in the middle part of the inner side wall of the brake body, the first groove and the second groove are communicated, the fixing protrusion slides in the first groove, and the fixing protrusion slides in the second groove. By arranging the fixing protrusion, the first groove and the second groove, the wheel cylinder can be prevented from being accidentally detached from the brake body during driving or braking, thereby reducing brake failure or accidents caused thereby. The wheel cylinder is further limited in the brake body, which helps to keep the brake efficiency constant, so that the brake can quickly slow down and stop in an emergency braking situation, and the stability and reliability of the brake are further improved.

[0009] Preferably, the positioning assembly comprises a third groove, the third groove is a pair of and symmetrically formed on the inner wall of the wheel cylinder, a limiting rod is fixedly connected to the middle part of the inner side wall of the third groove, a pair of connecting blocks are fixed to the middle part of the side wall of the second piston plate, the connecting blocks and the third grooves are correspondingly arranged, and the connecting blocks slide on the limiting rod. By arranging the third groove, the limiting rod and the connecting block, the movement track of the second piston plate in the second brake oil pipe can be limited, so that the second piston plate always keeps straight line movement, which helps to reduce the deviation or shaking of the second piston plate during movement due to lateral force, and the straight line movement of the second piston plate can keep the contact area and contact pressure between the brake friction block and the brake disc constant, thereby making the brake effect more consistent and reliable.

[0010] Preferably, the cleaning assembly comprises a liquid inlet pipe fixedly connected to the side wall of the brake body, and a liquid outlet pipe fixedly connected to the middle part of the side wall of the brake body. The brake body, the liquid inlet pipe and the liquid outlet pipe are all hollow and communicated. By arranging the liquid inlet pipe and the liquid outlet pipe, the residual oil stains, dust and other impurities in the brake body can be removed, the flexibility and smoothness of the brake body are restored, and the brake response speed is improved.

[0011] Preferably, a self-lubricating block is arranged in the middle part of the inner side wall of the third groove and arranged in the second brake oil pipe. By arranging the self-lubricating block, the friction coefficient between the third groove and the connecting block can be reduced, the service life of the connecting block can be prolonged, and the good movement performance and precision of the connecting block can be maintained.

[0012] Preferably, an elastic pad is fixedly connected to the middle part of the side wall of the fourth fixing block, and the elastic pad is made of elastic material. By arranging the elastic pad, the wheel cylinder can be protected from direct impact and damage during clamping, and the clamping process can be more stable and reliable.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1.The hydraulic disc brake, through the step, can fix the wheel cylinder in the brake body, so that the brake disc in the wheel cylinder will not easily fall off the brake body during braking, reduces the situation of brake effect decline caused by the shaking or instability of the wheel cylinder, and the stable wheel cylinder can make the brake friction block press on the brake disc with constant pressure, so that the hydraulic signal or mechanical force can be transmitted more effectively, so as to ensure that the brake disc can quickly respond to the brake instruction, and improve the stability and reliability of braking.

[0015] 2.The hydraulic disc brake, by setting the fixing protrusion, the first channel and the second channel, the wheel cylinder can be prevented from accidentally falling off from the brake body during driving or braking, so as to reduce the brake failure or accident caused thereby, the setting can further limit the wheel cylinder in the brake body, helps to keep the constant brake efficiency, so that it can quickly slow down and stop in the case of emergency braking, and further improves the stability and reliability of braking. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described below in combination with the drawings.

[0017] Figure 1 is the perspective view of the utility model;

[0018] Figure 2 is the sectional view of the brake body in the utility model;

[0019] Figure 3 is the cooperation structure schematic view of the piston plate and the limiting rod in the utility model;

[0020] Figure 4 is the cooperation structure schematic view of the fixing protrusion and the channel in the utility model.

[0021] LEGEND:

[0022] 1, brake body;11, hydraulic cylinder;12, first piston plate;13, brake master cylinder;14, first air vent;15, first brake oil pipe;16, wheel cylinder;17, second air vent;18, second brake oil pipe;19, first spring;110, second piston plate;111, brake disc;2, movable rod;21, limiting plate;22, second spring;23, first fixed block;24, second fixed block;25, third fixed block;26, fourth fixed block;27, third spring;3, fixing protrusion;31, first channel;32, second channel;4, third channel;41, limiting rod;42, connecting block;5, liquid inlet pipe;51, liquid outlet pipe;6, self-lubricating block;7, elastic pad. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described 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. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0024] Specific embodiments are given below.

[0025] As Figures 1 to 4As shown, the utility model discloses a hydraulic disc brake, including brake body 1, brake body 1 side wall middle part is equipped with hydraulic cylinder 11, and the output end of hydraulic cylinder 11 is fixed with first piston plate 12, and hydraulic cylinder 11 and brake body 1 are equipped with brake master cylinder 13 between, and first piston plate 12 slides in brake master cylinder 13 inside, brake body 1 side wall middle part is equipped with a plurality of first air vent 14, and brake body 1 inner side wall middle part is equipped with first brake oil pipe 15, and brake body 1 inner side wall middle part is equipped with clamping assembly, and clamping assembly is arranged in first brake oil pipe 15 inside, and brake body 1 side wall middle part is slidably fitted with a pair of wheel cylinder 16, and wheel cylinder 16 side wall middle part is equipped with second air vent 17, and wheel cylinder 16 side wall middle part is equipped with second brake oil pipe 18, and brake master cylinder 13, first air vent 14, first brake oil pipe 15, second air vent 17 and second brake oil pipe 18 are hollow and are communicated, and the inner side wall middle part of wheel cylinder 16 is fixed with a plurality of first spring 19, and first spring 19 is arranged in second brake oil pipe 18 inside, and the other end of first spring 19 is fixed with second piston plate 110, and second piston plate 110 slides in second brake oil pipe 18 inside, and the side wall middle part of second piston plate 110 is fixedly connected with brake disc 111, and the inner side wall middle part of brake body 1 is equipped with limiting assembly, and the side wall middle part of brake body 1 is equipped with cleaning assembly, when working, staff inserts a pair of wheel cylinder 16 into brake body 1 inside under the action of limiting assembly, then uses clamping assembly to fix wheel cylinder 16 in brake body 1 inside, then starts hydraulic cylinder 11, and hydraulic cylinder 11 drives first piston plate 12 to slide in brake master cylinder 13 inside, and first piston plate 12 will extrude the airflow in brake master cylinder 13 inside in the sliding process, because brake master cylinder 13, first air vent 14, first brake oil pipe 15, second air vent 17 and second brake oil pipe 18 are communicated, the airflow in brake master cylinder 13 inside will enter first brake oil pipe 15 inside through a plurality of first air vent 14, and enter second brake oil pipe 18 inside through second air vent 17, and the airflow will extrude second piston plate 110 in second brake oil pipe 18 inside, and second piston plate 110 will slide in second brake oil pipe 18 inside under the limitation of limiting assembly when being extruded, and second piston plate 110 will move with brake disc 111 simultaneously, and a pair of brake disc 111 moves towards simultaneously at this time, and the effect of braking to wheel is carried out, when brake disc 111 does not move smoothly, cleaning assembly is used to inject cleaning fluid into brake body 1 inside, and brake body 1 is cleaned.

[0026] As Figure 1 And Figure 2As shown, the clamping assembly comprises a pair of movable rods 2 sliding on the side wall of the brake body 1, the end of the movable rod 2 is fixedly connected with a limiting plate 21 arranged outside the brake body 1, a pair of second springs 22 corresponding to the movable rod 2 are fixedly arranged in the middle of the inner side wall of the brake body 1, the end of the second spring 22 and the movable rod 2 are both equipped with a first fixed block 23, a third spring 27 is fixed between the first fixed block 23 on one side and the brake body 1, a plurality of second fixed blocks 24 are rotatably connected to the middle of the side wall of the first fixed block 23, a plurality of third fixed blocks 25 are rotatably connected to the middle of the side wall of the second fixed block 24, a plurality of fourth fixed blocks 26 are rotatably connected to the middle of the side wall of the third fixed block 25, during operation, the worker pulls the limiting plate 21 outward, at this time the limiting plate 21 will drive the connected movable rod 2, first fixed block 23, second fixed block 24, third fixed block 25, fourth fixed block 26 and third spring 27 to move outward, then insert the wheel cylinder 16 into the brake body 1, and then release the limiting plate 21, at this time the limiting plate 21 will move towards the side wall of the brake body 1 under the rebounding action of the third spring 27, so that the first fixed block 23, the second fixed block 24, the third fixed block 25 and the fourth fixed block 26 connected with the limiting plate 21 are pressed on the surface of the wheel cylinder 16, at the same time the first fixed block 23, the second fixed block 24, the third fixed block 25 and the fourth fixed block 26 connected with the second spring 22 will be extruded by the wheel cylinder 16 and pressed on the surface of the wheel cylinder 16 under the action of the second spring 22, because the first fixed block 23, the second fixed block 24, the third fixed block 25 and the fourth fixed block 26 are all rotatably connected, at this time the clamping assembly will fix the wheel cylinder 16 of different shapes and sizes inside the brake body 1 from both sides, through this step the wheel cylinder 16 can be fixed inside the brake body 1, so that the brake disc 111 inside the wheel cylinder 16 will not easily fall off the brake body 1 during braking, reducing the situation that the braking effect is reduced due to the shaking or instability of the wheel cylinder 16, and the stable wheel cylinder 16 can make the brake friction block press on the brake disc 111 with constant pressure, so that the hydraulic signal or mechanical force can be transmitted more effectively, thereby ensuring that the brake disc 111 can quickly respond to the brake instruction, improving the stability and reliability of braking.

[0027] As Figures 2 to 4As shown, the limiting assembly includes a plurality of fixed protrusions 3 fixed on the side wall of the wheel cylinder 16, a plurality of first grooves 31 are arranged in the middle of the inner side wall of the brake body 1, the first grooves 31 and the fixed protrusions 3 are correspondingly arranged, a second groove 32 is arranged in the middle of the inner side wall of the brake body 1, the first groove 31 and the second groove 32 are communicated, the fixed protrusions 3 slide in the first groove 31, and the fixed protrusions 3 slide in the second groove 32. During operation, the workers align the plurality of fixed protrusions 3 on the side wall of the wheel cylinder 16 with the first grooves 31, and then insert the wheel cylinder 16 into the brake body 1, at this time the fixed protrusions 3 will slide along the first grooves 31, because the first grooves 31 and the second grooves 32 are communicated, the fixed protrusions 3 will slide into the second grooves 32, and then rotate the wheel cylinder 16 to make the fixed protrusions 3 and the first grooves 31 disengage, at this time the wheel cylinder 16 will be limited in the brake body 1, this step can prevent the wheel cylinder 16 from accidentally falling out of the brake body 1 during driving or braking, thereby reducing the brake failure or accidents caused thereby, this setting can further limit the wheel cylinder 16 in the brake body 1, which helps to keep the braking efficiency constant, so that it can quickly slow down and stop in an emergency braking situation, further improving the stability and reliability of braking.

[0028] As shown in the Figure 3 The positioning assembly includes a third groove 4, the third groove 4 is a pair of and symmetrically arranged on the inner wall of the wheel cylinder 16, a limiting rod 41 is fixedly connected to the middle of the inner side wall of the third groove 4, a pair of connecting blocks 42 are fixed to the middle of the side wall of the second piston plate 110, the connecting blocks 42 and the third grooves 4 are correspondingly arranged, and the connecting blocks 42 slide on the limiting rod 41. During operation, when the second piston plate 110 moves under the extrusion of airflow in the second brake oil pipe 18, the connecting blocks 42 fixed on both sides of the second piston plate 110 will slide along the limiting rod 41, so that the brake disc 111 fixed to the side wall of the second piston plate 110 always keeps straight movement. This step can limit the movement track of the second piston plate 110 in the second brake oil pipe 18, so that it always keeps straight movement, which helps to reduce the deviation or shaking of the second piston plate 110 during movement due to lateral force, and the straight movement of the second piston plate 110 can keep the contact area and contact pressure between the brake friction block and the brake disc 111 constant, thereby making the braking effect more consistent and reliable.

[0029] As shown in the Figure 1As shown, the cleaning assembly comprises a liquid inlet pipe 5 fixed on the side wall of the brake body 1, and a liquid outlet pipe 51 fixed on the middle part of the side wall of the brake body 1. The brake body 1, the liquid inlet pipe 5 and the liquid outlet pipe 51 are all hollow and communicate with each other. When the brake disc 111 moves not smoothly, the worker stops the brake and maintains and cleans the brake body 1. At this time, the cleaning liquid is injected into the brake body 1 through the liquid inlet pipe 5, and the cleaned sewage is led out from the liquid outlet pipe 51. This step can remove the residual oil stains, dust and other impurities in the brake body 1, restore the flexibility and smoothness of the brake body 1, and thus improve the brake response speed.

[0030] As shown in Figure 3 The inside wall of the third channel 4 is equipped with a self-lubricating block 6 in the middle part. The self-lubricating block 6 is arranged in the second brake oil pipe 18. This step can reduce the friction coefficient between the third channel 4 and the connecting block 42, help to prolong the service life of the connecting block 42, and also maintain its good motion performance and precision.

[0031] As shown in Figure 2 The side wall of the fourth fixed block 26 is fixed with an elastic pad 7 in the middle part. The elastic pad 7 is made of elastic material. This step can not only protect the wheel cylinder 16 from direct impact and damage during clamping, but also make the clamping process more stable and reliable.

[0032] Working principle: The worker inserts a pair of wheel cylinders 16 into the brake body 1 under the action of the limiting assembly, then fixes the wheel cylinder 16 in the brake body 1 using the clamping assembly, then starts the hydraulic cylinder 11, the hydraulic cylinder 11 drives the first piston plate 12 to slide in the brake master cylinder 13, and the first piston plate 12 will squeeze the airflow in the brake master cylinder 13 during sliding, because the brake master cylinder 13, the first air port 14, the first brake oil pipe 15, the second air port 17 and the second brake oil pipe 18 are communicated, at this time the airflow in the brake master cylinder 13 will enter the first brake oil pipe 15 inside through a plurality of first air ports 14, and enter the second brake oil pipe 18 inside through the second air port 17, the airflow will squeeze the second piston plate 110 in the second brake oil pipe 18, and the second piston plate 110 will slide in the second brake oil pipe 18 under the limitation of the positioning assembly when it is squeezed, at this time the second piston plate 110 will move with the brake disc 111, at this time a pair of brake discs 111 move towards each other to brake the wheels, when the brake disc 111 moves not smoothly, the cleaning assembly is used to inject cleaning liquid into the brake body 1 to clean the inside of the brake body 1, the worker pulls the limiting plate 21 outward, at this time the limiting plate 21 will drive the connected movable rod 2, first fixed block 23, second fixed block 24, third fixed block 25, fourth fixed block 26 and third spring 27 to move outward, then insert the wheel cylinder 16 into the brake body 1, and then release the limiting plate 21, at this time the limiting plate 21 will move towards the side wall of the brake body 1 under the rebound action of the third spring 27, so that the first fixed block 23, the second fixed block 24, the third fixed block 25 and the fourth fixed block 26 connected with the limiting plate 21 are pressed on the surface of the wheel cylinder 16, and the first fixed block 23, the second fixed block 24, the third fixed block 25 and the fourth fixed block 26 connected with the second spring 22 are squeezed by the wheel cylinder 16 and pressed on the surface of the wheel cylinder 16 under the action of the second spring 22, because the first fixed block 23, the second fixed block 24, the third fixed block 25 and the fourth fixed block 26 are all rotationally connected, at this time the clamping assembly will fix the wheel cylinder 16 of different shapes and sizes in the brake body 1 from both sides, the worker aligns a plurality of fixed lugs 3 on the side wall of the wheel cylinder 16 with the first groove 31, then inserts the wheel cylinder 16 into the brake body 1, at this time the fixed lug 3 will slide along the first groove 31, because the first groove 31 and the second groove 32 are communicated, the fixed lug 3 will slide into the second groove 32, then rotate the wheel cylinder 16 to make the fixed lug 3 and the first groove 31 disengage, at this time the wheel cylinder 16 will be limited in the brake body 1, when the second piston plate 110 is squeezed and moved in the second brake oil pipe 18, the connecting block 42 fixed on both sides of the second piston plate 110 will slide along the limiting rod 41, so that the brake disc 111 fixed on the side wall of the second piston plate 110 always keeps straight movement, when the brake disc 111 moves not smoothly, the worker stops braking,And the brake body 1 is maintained and cleaned, at this time, the cleaning liquid is injected into the brake body 1 through the liquid inlet pipe 5, and the cleaned sewage is led out from the liquid outlet pipe 51.

[0033] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A hydraulic disc brake comprising a brake body (1), characterised in that: The brake body (1) side wall middle part is equipped with a hydraulic cylinder (11), the output end of the hydraulic cylinder (11) is fixedly connected with a first piston plate (12), a brake master cylinder (13) is arranged between the hydraulic cylinder (11) and the brake body (1), the first piston plate (12) slides in the brake master cylinder (13), a plurality of first air vents (14) are arranged in the middle part of the inner side wall of the brake body (1), a first brake oil pipe (15) is arranged in the middle part of the inner side wall of the brake body (1), a clamping assembly is arranged in the middle part of the inner side wall of the brake body (1), the clamping assembly is arranged in the first brake oil pipe (15), a pair of wheel cylinders (16) are slidably connected to the middle part of the side wall of the brake body (1), a second air vent (17) is arranged in the middle part of the side wall of the wheel cylinder (16), a second brake oil pipe (18) is arranged in the middle part of the side wall of the wheel cylinder (16), the brake master cylinder (13), the first air vent (14), the first brake oil pipe (15), the second air vent (17) and the second brake oil pipe (18) are hollow and communicate with each other, a plurality of first springs (19) are fixedly connected to the middle part of the inner side wall of the wheel cylinder (16), the first springs (19) are arranged in the second brake oil pipe (18), the other end of the first spring (19) is fixedly connected with a second piston plate (110), the second piston plate (110) slides in the second brake oil pipe (18), a brake disc (111) is fixedly connected to the middle part of the side wall of the second piston plate (110), a positioning assembly is arranged in the middle part of the inner side wall of the brake body (1), a positioning assembly is arranged in the middle part of the inner side wall of the brake body (1), and a cleaning assembly is arranged in the middle part of the side wall of the brake body (1).

2. A hydraulic disc brake according to claim 1, characterized in that: The clamping assembly comprises a pair of movable rods (2), the movable rods (2) slide on the side wall of the brake body (1), limit plates (21) are fixedly connected to the ends of the movable rods (2), the limit plates (21) are arranged outside the brake body (1), a pair of second springs (22) are fixedly connected to the middle part of the inner side wall of the brake body (1), the second springs (22) and the movable rods (2) are correspondingly arranged, first fixed blocks (23) are arranged at the ends of the second springs (22) and the movable rods (2), third springs (27) are arranged between the first fixed blocks (23) and the brake body (1) on one side, a plurality of second fixed blocks (24) are rotatably connected to the middle part of the side wall of the first fixed block (23), a plurality of third fixed blocks (25) are rotatably connected to the middle part of the side wall of the second fixed block (24), and a plurality of fourth fixed blocks (26) are rotatably connected to the middle part of the side wall of the third fixed block (25).

3. A hydraulic disc brake according to claim 1, characterized in that: The limiting assembly comprises a plurality of fixing lugs (3) fixed on the side wall of the wheel cylinder (16), a plurality of first grooves (31) are formed in the middle of the inner side wall of the brake body (1), the first grooves (31) and the fixing lugs (3) are correspondingly arranged, a second groove (32) is formed in the middle of the inner side wall of the brake body (1), the first groove (31) and the second groove (32) are communicated, the fixing lugs (3) slide in the first groove (31), and the fixing lugs (3) slide in the second groove (32).

4. A hydraulic disc brake according to claim 1, characterized in that: The positioning assembly comprises a third groove (4), the third groove (4) is a pair of and symmetrically formed on the inner wall of the wheel cylinder (16), a limiting rod (41) is fixedly connected to the middle of the inner side wall of the third groove (4), a pair of connecting blocks (42) are fixed to the middle of the side wall of the second piston plate (110), the connecting blocks (42) and the third groove (4) are correspondingly arranged, and the connecting blocks (42) slide on the limiting rod (41).

5. A hydraulic disc brake according to claim 1, characterized in that: The cleaning assembly comprises a liquid inlet pipe (5), the liquid inlet pipe (5) is fixedly connected to the side wall of the brake body (1), a liquid outlet pipe (51) is fixedly connected to the middle of the side wall of the brake body (1), and the brake body (1), the liquid inlet pipe (5) and the liquid outlet pipe (51) are all hollow and communicated.

6. A hydraulic disc brake according to claim 4, characterized in that: The middle of the inner side wall of the third groove (4) is provided with a self-lubricating block (6), and the self-lubricating block (6) is arranged in the second brake oil pipe (18).

7. A hydraulic disc brake according to claim 2, characterized in that: The middle of the side wall of the fourth fixing block (26) is fixedly connected with an elastic pad (7), and the elastic pad (7) is made of elastic material.

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