Oil brake and bicycle

Abstract

This invention discloses a hydraulic brake caliper, comprising: a brake caliper body, a brake seat, a brake caliper, a first piston, a second piston, a first brake pad, a second brake pad, and a fixing pin. The brake seat has a cavity extending from a first end to a second end, and the cavity also has an oil inlet. The first piston is sealed and movably connected to the first end, and the second piston is sealed and movably connected to the second end. The fixing pin is connected to the brake seat and located on the bottom side of the brake seat. The first brake pad and the second brake pad are arranged alternately and are both movably connected to the fixing pin. The first brake pad is connected to the first piston, and the brake caliper is movably sleeved on the fixing pin, with one end connected to the second piston and the other end connected to the second brake pad. This invention connects the first brake pad to the first piston, and the second piston is then connected to the second brake pad via the brake caliper, so that the brake disc only has a piston on one side, reducing the thickness of the hydraulic brake caliper and allowing it to be used on bicycles where brake caliper thickness is required.

Description

Technical Field

[0001] This invention relates to the field of braking equipment technology, and more particularly to a hydraulic brake caliper and a bicycle. Background Technology

[0002] Disc brakes consist of a rotor mounted on a hub and a caliper installed on the frame and fork. Braking is achieved by clamping the rotor with brake pads inside the caliper. Disc brakes are divided into mechanical disc brakes and hydraulic disc brakes. Currently, mechanical disc brakes are unsuitable for folding bicycles due to their complex structure and the high stiffness of the brake cable. Hydraulic disc brakes, on the other hand, require pistons on both sides of the brake disc, resulting in a very thick caliper, which hinders the miniaturization of folding bicycles. Summary of the Invention

[0003] In view of this, the present invention provides a hydraulic brake caliper and a bicycle to solve the problem that the hydraulic disc brake in the prior art requires pistons to be arranged on both sides of the brake disc, resulting in a large thickness of the entire hydraulic brake caliper.

[0004] To achieve one or more of the above objectives or other objectives, the present invention provides a hydraulic brake caliper, comprising: a brake seat, a brake caliper, a first piston, a second piston, a first brake pad, a second brake pad, and a retaining pin;

[0005] The brake seat has a cavity extending from a first end to a second end, and the cavity is also provided with an oil inlet. The first piston is sealed and movably connected to the first end, and the second piston is sealed and movably connected to the second end.

[0006] The fixing pin is connected to the brake seat and is located on the bottom side of the brake seat; the first brake pad and the second brake pad are arranged alternately and are both movably connected to the fixing pin; the reset spring is engaged with the fixing pin, one end of the reset spring abuts against the first brake pad and the other end abuts against the second brake pad;

[0007] The first brake pad abuts against the first piston, and the brake caliper is movably sleeved on the fixing pin, with one end abutting against the second piston and the other end abutting against the second brake pad.

[0008] Furthermore, the brake seat also has a bottom-through groove, and the first end is connected to the inside of the groove by one side wall of the groove; the first brake pad and the second brake pad are both disposed in the groove, and both are movably connected to the fixing pin through the bottom of the groove;

[0009] The sidewall of the groove has an opening at the extension of the space between the first brake pad and the second brake pad, forming a space to accommodate the brake pad.

[0010] Furthermore, the reset spring has two connecting holes in the middle, and the fixing pin passes through the two connecting holes in sequence. Both ends of the reset spring are U-shaped.

[0011] Furthermore, the hydraulic brake caliper also includes a seal, and the cavity is provided with an oil outlet, the seal being detachably connected to the oil outlet.

[0012] Furthermore, the brake seat has a limiting through hole on the lower side of the second end to limit the movement distance of the brake caliper, and one end of the brake caliper passes through the limiting through hole to connect to the second piston.

[0013] Furthermore, the groove has a clearance groove on the side wall opposite to the first end, and one end of the brake caliper connected to the second brake pad is located in the clearance groove.

[0014] Furthermore, the brake caliper includes: a first connecting piece, a second connecting piece, and a U-shaped connecting piece;

[0015] The first connecting piece has a screw hole at the top for connecting the second piston, the outer side wall of the second connecting piece is provided with a protruding rib, and the bottom of both the first connecting piece and the bottom of the second connecting piece are provided with a fixing pin connecting hole. The U-shaped connecting piece is a U-shaped through groove structure.

[0016] The first connecting piece is connected to one end of the U-shaped connecting piece, and the second connecting piece is connected to the other end of the U-shaped connecting piece to form a U-shaped structure.

[0017] Furthermore, the hydraulic brake caliper also includes a first sealing ring and a second sealing ring. The first end has a first sealing groove inside, and the second end has a second sealing groove. The first sealing ring is sleeved on the first piston and seals the first sealing groove, and the second sealing ring is sleeved on the second piston and seals the second sealing groove.

[0018] To achieve one or more of the above objectives or other objectives, the present invention also provides a hydraulic brake caliper, comprising: a brake seat, a plurality of brake calipers, a plurality of first pistons, a plurality of second pistons, a plurality of first brake pads, a plurality of second brake pads, a plurality of reset springs, and a plurality of fixing pins.

[0019] The brake seat has multiple cavities extending from a first end to a second end, and the cavities are internally connected. The brake seat is also provided with an oil inlet and an oil outlet that connect the cavities. Each first end is sealed by a corresponding first piston, and each second end is sealed by a corresponding second piston.

[0020] Multiple fixing pins are respectively connected to the brake seat and are arranged corresponding to the cavity; the first brake pad and the second brake pad are arranged in pairs and are respectively movably connected to the corresponding fixing pins; any one of the reset springs is respectively snapped onto the fixing pin corresponding to it; one end of any one of the reset springs abuts against the first brake pad corresponding to it, and the other end abuts against the second brake pad corresponding to it.

[0021] The first brake pad abuts against the first piston corresponding to it, and each of the brake calipers is movably sleeved on the corresponding fixing pin, with one end abutting against the corresponding second piston and the other end abutting against the corresponding second brake pad.

[0022] To achieve one or more of the above objectives or other objectives, the present invention also provides a bicycle comprising the hydraulic brake calipers described in any of the preceding claims.

[0023] Implementing the embodiments of the present invention will have the following beneficial effects:

[0024] With the above-mentioned hydraulic brake caliper, since the brake housing only has a piston on one side of the brake disc, that is, the first piston connects to the first brake pad, and the second piston connects to the second brake pad through the brake caliper, the brake disc only has a piston on one side, which reduces the thickness of the hydraulic brake caliper and can be used on some bicycles with high requirements for brake caliper thickness. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] in:

[0027] Figure 1 This is an exploded view of the hydraulic brake caliper in one embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of a hydraulic brake caliper in one embodiment of the present invention;

[0029] Figure 3 This is a cross-sectional schematic diagram of a hydraulic brake caliper in one embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the brake seat in one embodiment of the present invention;

[0031] Figure 5This is another perspective of the structural schematic diagram of the brake seat in one embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the brake caliper structure in one embodiment of the present invention;

[0033] Figure 7 This is an exploded view of the hydraulic brake caliper in another embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the brake caliper structure in another embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the structure of the hydraulic brake caliper and brake disc combined in one embodiment of the present invention;

[0036] Figure 10 for Figure 9 Schematic diagram of section AA.

[0037] Figure label:

[0038] 1. Brake seat; 11. Cavity; 111. Oil inlet; 112. First sealing groove; 113. Second sealing groove; 114. Oil outlet; 12. Groove; 121. Opening; 122. Relief groove; 13. Limiting through hole; 1a. Bolt;

[0039] 2. Brake caliper; 21. First connecting piece; 22. Second connecting piece; 221. Rib; 23. U-shaped connecting piece; 231. Mudguard;

[0040] 3. First piston; 3a. First sealing ring;

[0041] 4. Second piston; 4a. Second sealing ring; 4b. Torx screw;

[0042] 5. First call card;

[0043] 6. The second ring;

[0044] 7. Fixing pin; 7a. Snap ring;

[0045] 8. Reset spring;

[0046] 9. Sealing components;

[0047] 10. Brake pads. Detailed Implementation

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0051] Reference Figures 1 to 6 The present invention provides a hydraulic brake caliper, comprising: a brake seat 1, a brake caliper 2, a first piston 3, a second piston 4, a first brake pad 5, a second brake pad 6, and a fixing pin 7;

[0052] The brake seat 1 has a cavity 11 extending from a first end to a second end. The cavity 11 is also provided with an oil inlet 111. The first piston 3 is sealed and movably connected to the first end, and the second piston 4 is sealed and movably connected to the second end.

[0053] The fixing pin 7 is connected to the brake seat 1 and is located on the bottom side of the brake seat 1; the first brake pad 5 and the second brake pad 6 are arranged alternately and are both movably connected to the fixing pin 7; the reset spring 8 is snapped onto the fixing pin 7, one end of the reset spring 8 abuts against the first brake pad 5 and the other end abuts against the second brake pad 6.

[0054] The first brake pad 5 abuts against the first piston 3, and the brake caliper 2 is movably sleeved on the fixing pin 7, with one end abutting against the second piston 4 and the other end abutting against the second brake pad 6.

[0055] In this embodiment, the first piston 3 and the second piston 4 generally have a circular outer diameter cross-section. The cavity 11 can be hollow and cylindrical, or cylindrical at its first and second ends, which facilitates the installation of the first piston 3 and the second piston 4. Two through holes can be provided on the brake seat 1 for connecting the fixing pin 7. When connecting the fixing pin 7, the fixing pin 7 can be passed through these two through holes in sequence and then fixed by the snap ring 7a. The cavity 11 can be provided with a tubular extension structure, and the oil inlet 111 is the inlet of this tubular extension structure, which facilitates the connection of the oil pipe. Since the oil is liquid, the oil pipe is easy to fold. Furthermore, the brake seat 1 only has a piston on one side of the brake disc, i.e., the first piston 3 connects to the first brake pad 5, and the second piston 4 connects to the second brake pad 6 through the brake caliper 2. This means that the brake disc only has a piston on one side, reducing the thickness of the hydraulic brake caliper, which can be used on some folding bicycles where the brake caliper thickness is required. The second piston 4 can be connected to the brake caliper 2 by a Torx screw 4b. When the aforementioned hydraulic brake caliper is in use, the brake seat can be fixed to the bicycle using bolts 1a, etc. At this time, the brake pads 10 are located between the first brake pad 5 and the second brake pad 6. Brake fluid enters from the inlet 111 of the cavity 11, pushing the pistons on the first and second ends outward to... Figure 3 For example, at this time, the first piston 3 moves to the left and pushes the first brake pad 5 to the left, while the second piston 4 moves to the right, driving the brake caliper 2 to move to the right and pushing the second brake pad 6 connected to the brake caliper 2 to the right, thus clamping the brake pad 10 and achieving braking.

[0056] In one embodiment, the brake seat 1 also has a bottom-through groove 12, with the first end connected to the inside of the groove 12 by a side wall of the groove 12; the first brake pad 5 and the second brake pad 6 are both disposed in the groove 12 and both pass through the bottom of the groove 12 to be movably connected to the fixing pin 7.

[0057] The sidewall of the groove 12 has an opening 121 at the extension position of the space between the first brake pad 5 and the second brake pad 6, forming a space to accommodate the brake pad 10.

[0058] In this embodiment, the brake seat 1 is provided with a through-hole groove 12. The first brake pad 5 and the second brake pad 6 are both disposed in the groove 12, which can limit the opening distance of the first brake pad 5 and the second brake pad 6. That is, the maximum opening distance of the first brake pad 5 and the second brake pad 6 can only be the distance between the two brake pads when they abut against the side wall of the adjacent groove 12. Limiting this distance is beneficial to controlling the braking sensitivity of the brake caliper. Even if the first brake pad 5 and the second brake pad 6 are relatively close to the brake pad 10, the distance that the first brake pad 5 and the second brake pad 6 need to be pushed during braking is relatively short, and the braking sensitivity is relatively high.

[0059] In one embodiment, the hydraulic brake caliper further includes a reset spring 8, which is snapped onto the fixing pin 7. One end of the reset spring 8 is connected to the first brake pad 5, and the other end is connected to the second brake pad 6.

[0060] Preferably, the reset spring 8 has two connecting holes in its length direction in the middle, and the fixing pin 7 passes through the two connecting holes in sequence. Both ends of the reset spring 8 are U-shaped.

[0061] In this embodiment, the two connecting holes in the middle of the reset spring 8 along its length mean that when the reset spring 8 is unfolded, the two connecting holes are located in the middle of the reset spring 8, and the direction of these two connecting holes is along the length direction of the reset spring 8. Both ends of the reset spring 8 are U-shaped, with a relatively large connection area. When connected to the first brake pad 5 and the second brake pad 6, the elastic force is uniform and the rebound effect is good. The reset spring 8 allows the two brake pads to quickly open after braking, releasing the brake, and also avoids unnecessary frictional wear between the brake pads and the brake lining 10.

[0062] In one embodiment, the hydraulic brake caliper further includes a seal 9, and the cavity 11 is also provided with an oil outlet 114, with the seal 9 being detachably connected to the oil outlet 114.

[0063] In this embodiment, the aforementioned sealing element 9 can be a screw, bolt, or other component, or a clip, cover, or other component. When using screws, bolts, bolts, or other components for sealing, a rubber ring can be added to assist the sealing. When using clips, covers, or other components for sealing, a rubber gasket can also be added to assist the sealing. The purpose of providing the oil outlet 114 is to facilitate oil drainage for maintenance and repair, and to balance the air pressure at the oil inlet at the brake lever position during oil filling, so that the entire hydraulic brake system can be filled normally. In particular, in some embodiments, the oil outlet 114 can also be located on the second piston 4, etc., and can also be sealed by screws or other components.

[0064] In one embodiment, the brake seat 1 has a limiting through hole 13 below the second end side to limit the movement distance of the brake caliper 2, and one end of the brake caliper 2 passes through the limiting through hole 13 to connect to the second piston 4.

[0065] In this embodiment, the aforementioned limiting through hole 13 mainly functions as a baffle, limiting the outward movement distance of the end of the brake caliper 2 connected to the second piston 4, and preventing the second piston 4 from detaching from the second end and causing a malfunction.

[0066] In one embodiment, the groove 12 has a relief groove 122 on the side wall opposite to the first end, and one end of the brake caliper 2 connected to the second brake pad 6 is located in the relief groove 122.

[0067] In this embodiment, since the second brake pad 6 is sheet-shaped, and the end of the brake caliper 2 connected to the second brake pad 6 is located on the outside of the brake pad, the groove 12 has a relief groove 122 on the side wall opposite to the first end. The end of the brake caliper 2 connected to the second brake pad 6 is located in the relief groove 122. This is equivalent to the relief groove 122 accommodating the thickness of the end of the brake caliper 2 connected to the second brake pad 6. That is, the second connecting piece 22, which will be introduced later, is accommodated in the relief groove 122, which makes the entire brake caliper thinner and less thick.

[0068] In one embodiment, the brake caliper 2 includes: a first connecting piece 21, a second connecting piece 22, and a U-shaped connecting piece 23;

[0069] The top of the first connecting piece 21 has a screw hole for connecting the second piston 4, the outer side wall of the second connecting piece 22 is provided with a protruding rib 221, the bottom of the first connecting piece 21 and the bottom of the second connecting piece 22 are both provided with a fixing pin 7 connecting hole, and the U-shaped connecting piece 23 has a U-shaped through groove structure.

[0070] The first connecting piece 21 is connected to one end of the U-shaped connecting piece 23, and the second connecting piece 22 is connected to the other end of the U-shaped connecting piece 23 to form a U-shaped structure.

[0071] In this embodiment, the U-shaped connecting piece 23 is configured as a U-shaped through-groove structure. During assembly, the fixing pin 7 and the part connected to the fixing pin 7 are located inside this U-shaped through-groove structure. In this way, the U-shaped through-groove structure can block some things such as mud and dust, preventing these things from entering the above-mentioned structures and causing brake caliper failure. In some embodiments, refer to Figure 8 The mudguard 231 is a U-shaped connecting piece 233 that extends along the connection point with the first connecting piece 231 and the second connecting piece 232. It can seal the bottom of the brake seat 10 completely, thereby preventing splashed mud and sand from entering the brake seat 10 and reducing the failure rate of the brake.

[0072] In one embodiment, the hydraulic brake caliper further includes a first sealing ring 3a and a second sealing ring 4a. The first end has a first sealing groove 112 inside, and the second end has a second sealing groove 113. The first sealing ring 3a is sleeved on the first piston 3 and seals the first sealing groove 112. The second sealing ring 4a is sleeved on the second piston 4 and seals the second sealing groove 113.

[0073] In this embodiment, the first sealing ring 3a and the second sealing ring 4a are preferably rubber rings, which are corrosion-resistant and have good elasticity. The first sealing ring 3a is sleeved on the first piston 3 and seals the first sealing groove 112, and the second sealing ring 4a is sleeved on the second piston 4 and seals the second sealing groove 113. When the first piston 3 and the second piston 4 move, the first sealing ring 3a and the second sealing ring 4a can undergo elastic deformation, which can maintain the sealing performance of the first end and the second end well.

[0074] Reference Figure 7 , Figure 9 and Figure 10 An embodiment of the present invention also proposes a hydraulic brake caliper, comprising: a brake seat 1, a plurality of brake calipers 2, a plurality of first pistons 3, a plurality of second pistons 4, a plurality of first brake pads 5, a plurality of second brake pads 6, a plurality of reset springs 8, and a plurality of fixing pins 7.

[0075] The brake seat 1 has multiple cavities 11 extending from the first end to the second end. The cavities 11 are internally connected. The brake seat 1 is also provided with an oil inlet 111 and an oil outlet 114 connecting the cavities 11. Each first end is sealed by a corresponding first piston 3, and each second end is sealed by a corresponding second piston 4.

[0076] Multiple fixing pins 7 are respectively connected to the brake seat 1, and are respectively arranged in relation to the cavity 11; the first brake pad 5 and the second brake pad 6 are arranged in pairs and are respectively movably connected to the corresponding fixing pins 7; any reset spring 8 is respectively snapped into the fixing pin 7 corresponding to it; one end of any reset spring 8 abuts against the first brake pad 5 corresponding to it, and the other end abuts against the second brake pad 6 corresponding to it.

[0077] The first brake pad 5 abuts against the corresponding first piston 3, and each brake caliper 2 is movably sleeved on its corresponding fixing pin 7, with one end abutting against the corresponding second piston 4 and the other end abutting against the corresponding second brake pad 6.

[0078] In this embodiment, comparison Figure 1In this embodiment, a hydraulic brake caliper consists of multiple pairs of pistons, and the working principle of multiple pairs of pistons is similar to that of a single piston in the previous embodiment. Specifically, the outer diameter cross-section of the first piston 3 and the second piston 4 is generally circular, and the cavity 11 can be hollow and cylindrical, or cylindrical at its first and second ends, which facilitates the installation of the first piston 3 and the second piston 4. Of course, it can also be made square as needed. The brake seat 1 can be provided with through holes according to the number of cavities 11 for connecting the fixing pins 7. When connecting the fixing pins 7, the fixing pins 7 can be passed through the through holes at the bottom of the corresponding cavities in sequence, and then fixed by the snap rings 7a. One of the aforementioned cavities 11 can be equipped with a tubular extension structure, with the oil inlet 111 serving as the inlet of this tubular extension structure. This facilitates the connection of the oil pipe. Since oil is liquid, the oil pipe is easy to fold, making it more suitable for folding bicycles compared to cable conduits. Furthermore, the brake housing 1 has a piston only on one side of the brake disc, connecting the first brake pad 5 via the first piston 3, and the second piston 4 connecting the second brake pad 6 via the brake caliper 2. This design reduces the thickness of the hydraulic brake caliper, making it suitable for folding bicycles where caliper thickness is critical. The second piston 4 can be connected to the brake caliper using a Torx screw 4b. When the hydraulic brake caliper is in use, the brake housing can be fixed to the bicycle using bolts 1a, etc. At this time, the brake pad 10 is located between the first brake pad 5 and the second brake pad 6. Brake fluid enters from the oil inlet 111 of the cavity 11, pushing the pistons on the first and second ends outwards. Figure 7 For example, at this time, the first piston 3 moves to the left and pushes the first brake pad 5 to the left, while the second piston 4 moves to the right, driving the brake caliper 2 to move to the right and pushing the second brake pad 6 connected to the brake caliper 2 to the right, thus clamping the brake pad 10 and achieving braking.

[0079] The present invention also proposes a bicycle, the bicycle including any of the hydraulic brake calipers described above.

[0080] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A hydraulic brake caliper, characterized in that, include: Brake housing, brake caliper, first piston, second piston, first brake pad, second brake pad, and retaining pin; The brake seat has a cavity extending from a first end to a second end, and the cavity is also provided with an oil inlet. The first piston is sealed and movably connected to the first end, and the second piston is sealed and movably connected to the second end. The fixing pin is connected to the brake seat and is located on the bottom side of the brake seat; the first brake pad and the second brake pad are arranged alternately and are both movably connected to the fixing pin; the reset spring is engaged with the fixing pin, one end of the reset spring abuts against the first brake pad and the other end abuts against the second brake pad; The first brake pad abuts against the first piston, and the brake caliper is movably sleeved on the fixing pin, with one end abutting against the second piston and the other end abutting against the second brake pad; The brake seat also has a bottom-through groove, and the first end is connected to the inside of the groove by one side wall of the groove; the first brake pad and the second brake pad are both disposed in the groove and are movably connected to the fixing pin through the bottom of the groove; The sidewall of the groove has an opening at the extension position of the space between the first brake pad and the second brake pad, forming a space to accommodate the brake pad; The groove has a clearance groove on the side wall opposite to the first end, and one end of the brake caliper that connects to the second brake pad is located in the clearance groove; The brake caliper includes: a first connecting piece, a second connecting piece, and a U-shaped connecting piece; The first connecting piece has a screw hole at the top for connecting the second piston, the outer side wall of the second connecting piece is provided with a protruding rib, and the bottom of both the first connecting piece and the bottom of the second connecting piece are provided with a fixing pin connecting hole. The U-shaped connecting piece is a U-shaped through groove structure. The first connecting piece is connected to one end of the U-shaped connecting piece, and the second connecting piece is connected to the other end of the U-shaped connecting piece to form a U-shaped structure.

2. The hydraulic brake caliper according to claim 1, characterized in that, The reset spring has two connecting holes in the middle, and the fixing pin passes through the two connecting holes in sequence. Both ends of the reset spring are U-shaped.

3. The hydraulic brake caliper according to claim 1, characterized in that, The hydraulic brake caliper also includes a seal, and the cavity is provided with an oil outlet, which is detachably connected to the seal.

4. The hydraulic brake caliper according to claim 1, characterized in that, The brake seat has a limiting through hole on the lower side of the second end to limit the movement distance of the brake caliper, and one end of the brake caliper passes through the limiting through hole to connect to the second piston.

5. The hydraulic brake caliper according to claim 1, characterized in that, The hydraulic brake caliper also includes a first sealing ring and a second sealing ring. The first end has a first sealing groove inside, and the second end has a second sealing groove. The first sealing ring is sleeved on the first piston and seals the first sealing groove. The second sealing ring is sleeved on the second piston and seals the second sealing groove.

6. A hydraulic brake caliper, characterized in that, include: Brake housing, multiple brake calipers, multiple first pistons, multiple second pistons, multiple first brake pads, multiple second brake pads, multiple return springs, and multiple retaining pins; The brake seat has multiple cavities extending from a first end to a second end, and the cavities are internally connected. The brake seat is also provided with an oil inlet and an oil outlet that connect the cavities. Each first end is sealed by a corresponding first piston, and each second end is sealed by a corresponding second piston. Multiple fixing pins are respectively connected to the brake seat and are arranged corresponding to the cavity; the first brake pad and the second brake pad are arranged in pairs and are respectively movably connected to the corresponding fixing pins; any one of the reset springs is respectively snapped onto the fixing pin corresponding to it; one end of any one of the reset springs abuts against the first brake pad corresponding to it, and the other end abuts against the second brake pad corresponding to it. The first brake pad abuts against the first piston corresponding to it, and each of the brake calipers is movably sleeved on the corresponding fixing pin, with one end abutting against the corresponding second piston and the other end abutting against the corresponding second brake pad; The brake seat also has a through-bottom groove, and the first end is connected to the inside of the groove by one side wall of the groove; the first brake pad and the second brake pad are both disposed in the groove and are movably connected to the fixing pin through the bottom of the groove; The sidewall of the groove has an opening at the extension position of the space between the first brake pad and the second brake pad, forming a space to accommodate the brake pad; The groove has a clearance groove on the side wall opposite to the first end, and one end of the brake caliper that connects to the second brake pad is located in the clearance groove; The brake caliper includes: a first connecting piece, a second connecting piece, and a U-shaped connecting piece; The first connecting piece has a screw hole at the top for connecting the second piston, the outer side wall of the second connecting piece is provided with a protruding rib, and the bottom of both the first connecting piece and the bottom of the second connecting piece are provided with a fixing pin connecting hole. The U-shaped connecting piece is a U-shaped through groove structure. The first connecting piece is connected to one end of the U-shaped connecting piece, and the second connecting piece is connected to the other end of the U-shaped connecting piece to form a U-shaped structure.

7. A bicycle, characterized in that, The bicycle includes the hydraulic brake calipers as described in any one of claims 1 to 6.

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