Oil pressure disc brake upper pump system

Abstract

The present application relates to a kind of connecting brake line rocker arm push rod;Hydraulic cylinder with internal piston, hydraulic cylinder includes the oil outlet hole being communicated with brake lower pump;Rocking arm push rod is connected with the piston, and the piston is moved in hydraulic cylinder when rocking arm push rod is pulled by brake line, and the hydraulic oil in hydraulic cylinder is discharged to lower pump by oil outlet hole;Through the sub-tank being communicated with the hydraulic cylinder by exchange hole;The sub-tank includes pressure balance hole, and the pressure balance hole is used to allow sub-tank to discharge or inhale air when balancing pressure, relative to prior art, the present application can reduce the brake force loss caused by pulling line.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of bicycle brake, particularly relates to the improvement of the oil pressure system of bicycle brake. BACKGROUND

[0002] As a riding tool, the brake system is an essential structure of bicycle, and the disc brake is one of the most common brake systems. Compared with the wire-pull disc brake, the oil pressure disc brake has strong braking force, small required braking force, and low maintenance frequency. Therefore, many road bikes are upgraded from the wire-pull disc brake to the wire-pull oil disc brake. The wire-pull structure from the upper pump to the lower pump of the upgraded wire-pull oil disc brake is still a wire and an outer tube friction structure, and the smoothness of the wire is poor, which greatly increases the friction. At this time, more force needs to be applied to the brake handle to get the desired braking force. Especially when downhill, more braking force is needed, and the hands will be tired for a long time, which has a safety risk. SUMMARY

[0003] The purpose of the present application is to solve the problem of brake deficiency caused by the length, elasticity of the wire, and outer tube friction of the existing wire-pull disc brake bicycle.

[0004] The oil pressure disc brake upper pump system comprises:

[0005] A rocker push rod connected to the brake wire;

[0006] A hydraulic cylinder with a piston arranged inside, the hydraulic cylinder comprising an oil outlet hole in communication with the brake lower pump;

[0007] The rocker push rod is connected to the piston, and when the rocker push rod is pulled by the brake wire, the piston is pushed to move in the hydraulic cylinder, and the hydraulic oil in the hydraulic cylinder is discharged to the lower pump through the oil outlet hole;

[0008] A sub-oil tank in communication with the hydraulic cylinder through an exchange hole;

[0009] The sub-oil tank comprises a pressure balance hole for allowing the sub-oil tank to discharge or suck air when balancing pressure.

[0010] In a preferred embodiment of the present application, an elastic oil bladder is arranged in the sub-oil tank, and the oil bladder is in sealed connection with the sub-oil tank to form a volume-expandable hydraulic oil cavity.

[0011] In a preferred embodiment of the present application, the oil bladder comprises a first end in sealed connection with an opening of the sub-oil tank, and a second end extending into the interior of the sub-oil tank, and a continuous space for elastic compression of the oil bladder is formed from the first end to the second end.

[0012] In a preferred embodiment of the present application, the second end of the oil bladder is a double concentric semi-circular wall, the middle of the concentric semi-circular wall comprising a portion of the continuous space.

[0013] In a preferred embodiment of the present application, the hydraulic oil bladder in the auxiliary oil tank comprises a deformation stop device, and a vent hole is arranged on the deformation stop device and connected with the pressure balance hole.

[0014] In a preferred embodiment of the present application, the exchange hole is arranged at a first distance in the direction of the piston movement, and the exchange hole is sealed after the piston moves the first distance.

[0015] In a preferred embodiment of the present application, a lubrication hole is further arranged to communicate the auxiliary oil tank and the piston wall, the lubrication hole keeps the hydraulic oil in the auxiliary oil tank in contact with the piston wall, and the piston wall comprises an annular lubrication groove for accommodating the hydraulic oil.

[0016] In a preferred embodiment of the present application, a reset spring is arranged in the hydraulic cylinder, and the reset spring resets the piston to the position where the exchange hole is not sealed after the brake is released.

[0017] In a preferred embodiment of the present application, the rocker arm push rod comprises a rotatable rocker arm and a push rod for pushing the piston, the push rod is pivotally connected with the rocker arm, and the rocker arm comprises a stay wire fixer and a rotating shaft.

[0018] In a preferred embodiment of the present application, the hydraulic cylinder and the auxiliary oil tank are arranged in a bracket, and the rocker arm is pivotally connected with the bracket.

[0019] The progress of the present application over the prior art is that a full hydraulic system is used between the upper pump and the lower pump system of the line-pull disc brake, thereby avoiding the problem of brake force loss caused by the use of line-pull between the upper pump and the lower pump system. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the upper pump system.

[0021] Figure 2 is an exploded structural schematic diagram of the upper pump system.

[0022] Figure 3 is a local exploded structural schematic diagram of the upper pump system.

[0023] Figure 4 is another local exploded structural schematic diagram of the upper pump system.

[0024] Figure 5 is still another local exploded structural schematic diagram of the upper pump system.

[0025] Figure 6 is a structural schematic diagram of a first sealing plug of the upper pump system.

[0026] Figure 7 is a schematic view of the upper pump system along the section plane A-A.

[0027] Figure 8 is a schematic view of the upper pump system along the section plane A-A.

[0028] Figure 9 is a schematic view of the upper pump system along the section plane A-A.

[0029] Figure 10 is a schematic view of the upper pump system along the section plane A-A. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described in further detail below with reference to the accompanying drawings. The embodiments described in the present application are preferred embodiments and do not represent all embodiments of the present application. Modifications made by those skilled in the art within the scope of the technical solutions of the present application are within the scope of protection of the present application. It should be noted that the scope of protection of the present application should be based on the description in the claims.

[0031] Please refer to Figure 1 , Figure 2 and Figure 7 , the overall pump system 100 includes: a rocker arm push rod 400 connected to the brake cable 401; a hydraulic cylinder 701 internally provided with a piston 500, the hydraulic cylinder 701 includes an oil outlet hole 702 in communication with the lower pump of the brake; the rocker arm push rod 400 is connected to the piston 500, and when the rocker arm push rod 400 is pulled by the brake cable 401, the piston 500 is pushed to move in the hydraulic cylinder 701, and the hydraulic oil in the hydraulic cylinder 701 is discharged to the lower pump system (not shown in the figure) through the oil outlet hole 702; a sub-tank 720 in communication with the hydraulic cylinder 701 through an exchange hole 703; the sub-tank 720 includes a pressure balance hole 921, and the pressure balance hole 921 is used to allow the sub-tank 720 to discharge or suck air when balancing the pressure.

[0032] Through the above system, the brake force transmitted by the pull cable 401 is converted into reciprocating motion of the piston 500 by the rocker arm push rod 400, and the hydraulic oil is pushed into the lower pump system by the piston 500, forming the brake force of the lower pump system. The upper pump system 100 is connected with the lower pump system through the hydraulic oil pipeline, and the connection between the upper pump system 100 and the lower pump system is completely connected by the hydraulic oil pipeline, which eliminates the traditional pull cable connection system and avoids the problem of brake force loss caused by pulling the cable.

[0033] Please refer to Figure 1 , Figure 3 and Figure 10As shown, the oil hydraulic disc brake upper pump system 100 is used to fix on the tube of the front fork or the rear fork near the wheel of the bicycle. The upper pump system 100 is provided with a fixing clamp 300 connected with the bracket 700, the fixing clamp 300 includes a first semicircular clamp 301 and a second semicircular clamp 302, the two clamps are fixed together through a screw fixing device 303, the second semicircular clamp is connected with the bracket 700 of the upper pump system 100 through a connecting plate 304, when it is needed to fix the upper pump system 100 on the bicycle, the first semicircular clamp 301 and the second semicircular clamp 302 need to be opened, the bicycle frame tube is placed between the first semicircular clamp 301 and the second semicircular clamp 302, and then the screw fixing device 303 is locked.

[0034] In the preferred embodiment of the present application, the lower pump system can be pre-connected with the upper pump system 100 or connected with the lower pump system after the upper pump system 100 is installed on the bicycle frame.

[0035] In the preferred embodiment of the present application, the lower pump system of the present application uses the lower pump system known to those skilled in the art.

[0036] Referring to Figure 1 and Figure 4 for easy observation Figure 4 Only the rocker arm push rod 400 device is exploded.

[0037] The rocker arm push rod 400 includes a rotatable rocker arm 402 and a push rod 403 for pushing the piston 500, the push rod 403 is pivotally connected with the rocker arm 402, the rocker arm 402 includes a pull wire fixer and a rotating shaft. The rocker arm 402 includes a first pivot fixer 408 and a second pivot fixer 409. The first pivot fixer 408 is used to pivotally fix the rocker arm 402 on the bracket 700, the bracket 700 includes a pivot seat 705 extending forward, the pivot seat 705 includes a shaft hole 706, the first pivot fixer 408 includes a shaft hole 416. The first rotating shaft 414 passes through the shaft hole 706 on the pivot seat 705 and the shaft hole 416 of the first pivot fixer 408, the first rotating shaft 414 is fixed by a half-head screw 417, when fixed, the internal thread in the first rotating shaft 414 is matched with the external thread at the front end of the half-head screw 417.

[0038] The second rotating shaft 413 fixer comprises a cavity 411 formed by two parallel shaft fixing pieces 410. The shaft of the second rotating shaft fixer 409 is inserted into the shaft hole 412 on the two parallel shaft fixing pieces 410, and the second rotating shaft 413 of the second rotating shaft fixer 409 is connected with the two parallel shaft fixing pieces 410 through riveting or other conventional fixing process. The second rotating shaft 413 is provided with a push rod 403 fixing hole 415, the push rod 403 is inserted into the push rod 403 fixing hole 415, and when the rocker arm 402 rotates around the first rotating shaft 414, the second rotating shaft 413 drives the fixed end of the push rod 403 to rotate, and at the same time converts the rotating motion of the second rotating shaft fixer 409 into the translational motion required by the movement of the piston 500.

[0039] The front end of the rocker arm 402 further comprises a stay fixer 405, which is provided with a stay fixing screw 406 and a stay pressing plate 407. Through the fixer, the pulling force of the stay is transmitted to the front end of the rocker arm 402, and the rocker arm 402 is driven to rotate.

[0040] Referring to Figure 5 , the other end of the push rod 403 opposite to the front end comprises a ball head structure 404, which cooperates with the ball groove 508 structure at the end of the piston 500. The ball head structure 404 ensures that the push rod 403 can rotate in the vertical direction when the rocker arm 402 rotates, and at the same time the ball head structure 404 pushes the piston 500 to move along the horizontal direction. Through the cooperation of the second rotating shaft 413 of the rocker arm 402 and the ball head structure 404, the conversion of the rocker arm 402 from rotating movement to horizontal movement is completed.

[0041] Referring to Figure 5 and Figure 7 , the ball head of the push rod 403 is fixed in the hydraulic cylinder 701 by a stop washer 509 and a snap spring 510. The hydraulic cylinder 701 is provided with a clamping groove structure 707 for stopping the snap spring 510, and the diameter of the clamping groove structure 707 is larger than the diameters of its two sides in the axial direction, so that the snap spring 510 cannot be taken out when it is clamped into the clamping groove structure 707. The stop washer 509 is stopped on the surface of the snap spring 510, and the other side of the stop washer 509 is stopped on the step 708 with a diameter larger than that of the hydraulic cylinder 701. The stop washer 509 is provided with a stop hole 511 for inserting the push rod 403, and the diameter of the stop hole 511 is larger than that of the push rod 403 but smaller than that of the ball head structure 404, so that the push rod 403 and the piston 500 are limited in the hydraulic cylinder 701.

[0042] Referring to Figure 5A schematic view of the piston 500 and its mating structure. The center of the piston 500 includes a first step 501 and a second step 502, which includes a lubrication groove 503 that retains hydraulic fluid to lubricate the sliding interface between the seal plug and the first step 501 and the second step 502 and the hydraulic cylinder 701. The front of the first step 501 includes a head 504 that has a smaller diameter than the first step 501, and the head 504 includes a stop third step 506 that also has a smaller diameter than the first step 501. In front of the third step 506 is a spring 507 retaining post 505 that is inserted into the hollow core of the spring 507 when the spring 507 is retained. A first seal plug 520 is mounted on the piston 500 behind the third step 506 of the head 504, and the first step 501 and the third step 506 define the axial position of the first seal plug 520.

[0043] On the other end of the piston 500 opposite the head 504 is a second seal plug 513 retaining groove 512 that is used to mount the second seal plug 513, which is a ring-shaped O-ring seal plug. Adjacent to the end of the retaining groove 512 is a circular truncated cone 514 that forms the spherical groove, and the diameter of the circular truncated cone 514 is smaller than the diameter of the first step 501 and the second step 502. The first step 501, the second step 502, the first seal plug 520, and the second seal plug 513 directly contact the inner wall of the hydraulic cylinder 701 when the piston 500 moves within the hydraulic cylinder 701.

[0044] Referring to Figure 6 the other side of the first seal plug 520 is shown.

[0045] The first sealing plug 520 comprises two parts, the first part 723 is a sealing base 521, and the second part 724 is a sealing lip 522 arranged on the sealing base 521, the diameter of the sealing lip 522 is greater than that of the sealing base 521, and an annular deformation groove 523 is formed between the sealing lip 522 and the sealing base 521, the sealing lip 522 is compressed when entering the hydraulic cylinder 701, and the deformation groove 523 can accommodate the compressed sealing lip 522. The deformation groove 523 has many advantages, one of which is to reserve a compression space for the sealing lip 522 to maintain the elasticity of the sealing lip 522; the second is to reduce the stress of the second sealing device to avoid excessive internal stress leading to accelerated aging. The third aspect is that the deformed sealing lip 522 can reduce the sliding friction of the piston 500; the fourth aspect is that the reverse force of the oil pressure on the sealing lip 522 through the deformation groove 523 is applied to the sealing lip 522, so that the sealing effect of the sealing lip 522 and the inner wall of the hydraulic cylinder 701 is enhanced.

[0046] In the assembly process of the above-mentioned components, the rocker arm push rod 400 is assembled first, the stop washer 509 is installed in advance on the push rod 403. Then the first sealing plug 520 and the second sealing plug 513 on the piston 500 are assembled, the reset spring 507 is connected with the fixed column 505, the piston 500 and the reset spring are sent into the hydraulic cylinder 701, and then the rocker arm push rod 400 that has been assembled is sent in. At this time, the position of the rocker arm push rod 400 can be fixed by using an external tool to place the reset spring 507 to rebound, and finally the snap spring 510 is assembled into the clamping groove 707, and the fixing tool outside the rocker arm push rod 400 is released to complete the assembly.

[0047] Continuing to refer to Figure 7 , the bracket 700 is arranged in the hydraulic cylinder 701, the hydraulic cylinder 701 comprises a small oil outlet hole 702, the oil outlet hole 702 is connected with an oil outlet chamber 722 for connecting a lower pump system, an oil pipe or an oil way (not shown in the figure) of the lower pump system is connected with the oil outlet chamber 722, and the oil outlet chamber 722 is selectively provided with a threaded structure or other commonly used connection mode to connect the oil pipe or the oil way.

[0048] The bracket 700 is provided with a sub-oil tank 720, which is arranged in the bracket 700 and is used to balance the pressure in the main oil cylinder. The sub-oil tank 720 comprises a first part 723 extending in a vertical direction and a second part 724 extending in a horizontal direction and communicating with the first part 723. An opening 725 is arranged above the first part 723, and a sealing cover 726 for sealing the opening is arranged on the opening, the sealing cover 726 comprises a sealing gasket 727, and the sealing cover 726 and the opening can be connected by using a threaded structure. When the sub-oil tank 720 is out of oil, the sealing cover 726 can be opened to supplement hydraulic oil into the oil tank. The second part 724 is provided with another sealing cover 728, and the two sealing covers 726 have the same structure. The two sealing covers are used to open different sealing covers 726 to observe the oil level.

[0049] The sub-oil tank 720 and the hydraulic cylinder 701 are connected through a hydraulic oil exchange hole 703 and a lubricating hole 704. The exchange hole 703 is arranged at a first distance in the direction of movement of the piston 500, and the exchange hole 703 is sealed after the piston 500 moves the first distance. Due to the friction of the brake pad during braking, heat generated by friction is conducted to the brake oil, causing the brake oil to expand due to heating. If the volume of the brake oil expanded after the expansion has no space to release, the high pressure inside the upper pump and lower pump systems is still maintained, which can cause the oil pressure piston 500 of the brake pad to fail to reset, resulting in a dangerous situation. Therefore, after the brake is released, the first sealing plug 520 is reset to the rear of the exchange hole 703, so that the exchange hole 703 communicates with the hydraulic cylinder 701 and the sub-oil tank 720, and the hydraulic oil expanded due to heating flows back into the sub-oil tank 720. Since the piston 500 resets each time the brake is released, at this time the hydraulic cylinder 701 and the sub-oil tank 720 are communicated, so that the oil pressure in the hydraulic cylinder 701 is released, and the brake will not be elevated due to heating and will not be elevated. When the temperature decreases, the pressure in the hydraulic cylinder decreases, and the oil in the sub-oil tank 720 can automatically flow back into the hydraulic cylinder 701.

[0050] Referring to Figure 7 and Figure 8When the piston 500 is in the first position PI, the exchange hole 703 is sealed by the piston 500, and the brake oil in the hydraulic cylinder 701 will not flow back to the auxiliary oil tank 720. When the piston 500 is in the second position P2, the exchange hole 703 is opened, and the brake oil in the hydraulic cylinder 701 will flow back to the auxiliary oil tank 720. When the piston 500 is in the second position P2, the lubrication hole 704 is sealed by the piston 500, and the lubrication oil in the auxiliary oil tank 720 will not flow out. When the piston 500 is in the first position PI, the lubrication hole 704 is opened, and the lubrication oil in the auxiliary oil tank 720 will flow into the lubrication groove 503. The ring groove is lubricated by the hydraulic oil in the hydraulic cylinder 701 during the movement of the piston 500. The reset spring 507 is arranged in the hydraulic cylinder 701, and the reset spring 507 resets the piston 500 to the first position PI when the brake is released.

[0051] With reference to Figure 8 and Figure 9 The elastic oil bag 900 is arranged in the auxiliary oil tank 720, and the elastic oil bag 900 is in sealed connection with the auxiliary oil tank 720 to form a cavity 902 with an expandable volume. The elastic oil bag 900 includes a first end 909 in sealed connection with an opening of the auxiliary oil tank 720, and a second end 910 extending into the interior of the auxiliary oil tank 720, and a sealed cavity 902 for expansion and contraction of the elastic oil bag 900 is formed from the first end 909 to the second end 910. The first end 909 of the elastic oil bag 900 includes an annular sealing gasket 913 connected with the sealing step 709 of the opening of the auxiliary oil tank 720.

[0052] The cross section of the elastic oil bag 900 is funnel-shaped, and the first end 909 of the elastic oil bag 900 includes an inclined surface 901, which gradually reduces the thickness of the cross section of the elastic oil bag 900 to form a low compressible cavity 902. The first end 909 of the elastic oil bag 900 is provided with a stopper 903 matched with the inclined surface 901, and the support surface 904 of the stopper 903 has the same slope as the first end 909 of the elastic oil bag 900. The stopper 903 is made of rigid material, and the inclined surface can prevent the elastic oil bag 900 from over-expanding. The stopper 903 includes a vertical surface 905, and the vertical surface 905 is provided with a vent hole 906 at the junction with the inclined surface, which is used to communicate the compressible cavity 902 of the elastic oil bag 900 with the atmosphere to balance the pressure.

[0053] The second end 910 of the oil tank 900 is a double-layer tongue structure, the middle of which comprises a continuous space forming the compressible cavity 902. The main part of the second end 910 of the oil tank 900 comprises two sealed concentric semicircular walls 911, which define a continuous sealed duckbill-shaped compressible cavity 902. The duckbill-shaped oil tank 900 has multiple advantages. On the one hand, due to its wide and flat shape, the concentric semicircular outer wall 911 is supported by the inner wall of the auxiliary oil tank 720, and it has good elasticity and can maintain good elasticity after repeated and long-term compression and reduction, so it has good durability. On the other hand, due to its wide shape, it has a large radial area, the same expansion volume of the material has a small radial travel, which can reduce the stress wear of the material and prolong the service life.

[0054] The stopper 903 further comprises a pressing edge 907 for sealing the gasket of the first end 909 of the oil tank 900, and a positioning protrusion 908 radially protruding from the pressing edge 907 around the pressing edge 907, which is arranged in the accommodation groove 729 at the threaded opening of the auxiliary oil tank 720. The auxiliary oil tank 720 further comprises a positioning screw 920 for fixing the stopper 903, the center of the positioning screw 920 is a spline vent hole 921, which is in communication with the atmosphere, and the air flowing out of the pressure balance hole 921 on the stopper 903 flows out to the atmosphere through the vent hole. The spline vent hole 921 also serves as a part that can be matched with a tightening wrench to facilitate rotation and installation.

[0055] The working process of each component during braking will be described below.

[0056] When braking is needed, the user squeezes the hand brake, the hand brake drives the brake pull wire 401, and the brake pull wire transmits the braking force to the wire pressing plate 407 at the front end of the rocker arm 402. The rocker arm 402 is driven to rotate by the wire pressing plate 407, and the rocker arm 402 converts the rotating motion of the rocker arm 402 into the forward and backward motion of the push rod 403 through the push rod 403 on the second rotating shaft 413. The piston 500 moves forward with the push rod 403, and during the movement of the piston 500 to the first distance d1, the lubricating oil in the oil cylinder is squeezed to flow back to the auxiliary oil tank 720 through the exchange hole 703, and when the piston 500 passes the exchange hole 703, the exchange hole 703 is sealed, and the oil in the auxiliary oil tank 720 and the hydraulic cylinder 701 no longer flows. During the continuous movement of the piston 500 to the most front end (position P2), the hydraulic oil enters the lower pump system from the oil outlet hole 702 in the oil cylinder, and at this time the oil pressure in the lower pump system drives the piston 500 to act, and the brake pad is tightened to form a braking force. After a period of friction, the bicycle (electric bicycle, etc.) is stopped by braking.

[0057] When the user releases the hand brake, the piston 500 resets to the initial position of the non-sealing exchange hole 703 under the action of the reset spring. After repeated braking, the part of the brake oil after resetting is heated and expanded due to the friction between the cam and the brake pad, flows to the initial position (position P1) through the exchange hole 703, and flows to the auxiliary oil tank 720. The volume of the auxiliary oil tank 720 expands, causing the oil bladder 900 of the auxiliary oil tank 720 to stretch and deform to a certain extent. The compressible cavity 902 in the oil bladder 900 is compressed, and the air therein is discharged to the atmosphere through the air hole 906 of the stop piece 903 and the pressure balance hole 921 of the fixing screw 920.

[0058] When the oil temperature drops, the brake oil in the auxiliary oil tank 720 automatically flows back into the hydraulic cylinder 701.

[0059] As described above, the present application converts the user's brake force into oil pressure by setting an oil pressure up pump, realizes braking through oil pressure, cancels the hydraulic cylinder between the up pump and the down pump, converts the user's brake force into oil pressure brake force, and solves the problem of friction of the wire in the pipeline in the prior art.

Claims

1. An oil pressure disc brake upper pump system, characterized by, The utility model relates to a brake system, comprising: a rocker arm push rod connected to a brake cable; a hydraulic cylinder with a piston inside, the hydraulic cylinder comprising an outlet hole communicating with a lower brake pump; the rocker arm push rod is connected to the piston, and when the rocker arm push rod is pulled by the brake cable, the piston is pushed to move in the hydraulic cylinder, and the hydraulic oil in the hydraulic cylinder is discharged to the lower brake pump through the outlet hole; a sub-tank communicating with the hydraulic cylinder through an exchange hole; the sub-tank is provided with an elastic oil bag, and the oil bag is in sealed connection with the sub-tank to form a volume-expandable hydraulic oil cavity; the oil bag comprises a first end in sealed connection with an opening of the sub-tank and a second end extending into the sub-tank, and a continuous space for elastic compression of the oil bag is formed from the first end to the second end; the sub-tank comprises a pressure balance hole for allowing the sub-tank to discharge or suck air when balancing pressure; the sub-tank comprises a hydraulic oil bag deformation stop device, and the deformation stop device is provided with an air hole connected with the pressure balance hole, and the exchange hole is arranged at a first distance in the piston travel direction, and the exchange hole is sealed after the piston travels the first distance.

2. The oil hydraulic disc brake in-pump system according to claim 1, characterized by The second end of the oil bag is a double-layer concentric semicircular wall, and the middle of the concentric semicircular wall comprises a part of the continuous space.

3. The oil hydraulic disc brake in-pump system according to claim 1, characterized by The utility model also comprises a lubricating hole communicating the sub-tank and the piston wall, the lubricating hole keeps the hydraulic oil in the sub-tank in contact with the piston wall, and the piston wall comprises an annular lubricating groove for accommodating the hydraulic oil.

4. The oil hydraulic disc brake in-pump system according to claim 3, characterized by The hydraulic cylinder is provided with a reset spring, and the reset spring resets the piston to a position where the exchange hole is not sealed after the brake is released.

5. The oil hydraulic disc brake in-pump system according to claim 1, wherein The rocker arm push rod comprises a rotatable rocker arm and a push rod for pushing the piston, the push rod is pivotally connected to the rocker arm, the rocker arm comprises a cable fixing device and a rotating shaft.

6. The oil hydraulic disc brake in-pump system according to claim 5, characterized by The hydraulic cylinder and the sub-tank are arranged in a bracket, and the rocker arm is pivotally connected to the bracket.

Images