Hydraulic braking device, hydraulic braking operation device, and bicycle

Abstract

Disclosed are a hydraulic braking device, a hydraulic braking operation device, and a bicycle. The hydraulic braking device comprises a cylinder body, a push rod piston and a reset spring. One end of the push rod piston reciprocates in the cylinder body by overcoming the elastic force of the reset spring. A push rod head is provided on the other end of the push rod piston. The hydraulic braking operation device comprises a support, an operating lever, and the hydraulic braking device, the operating lever being rotatably connected to the support; the hydraulic braking device is of a symmetrical structure and is provided in the support; a driving rod is arranged on the support, the head end of the driving rod being in contact with the operating lever, and the tail end of the driving rod being in contact with the hydraulic braking device; the driving rod is used for receiving a driving force from the operating lever.

Description

Hydraulic brake device, hydraulic brake operating device and bicycle Technical Field

[0001] The present disclosure relates to the technical field of bicycle brake devices, and in particular to a hydraulic brake device for bicycle hydraulic braking and a bicycle. Background Art

[0002] The bicycle market has been booming in recent years. Both high-end bicycles for competition and popular bicycles used as a means of transportation and leisure and entertainment are popular among consumers.

[0003] Bicycle braking methods are generally divided into cable brakes and hydraulic brakes. The hydraulic brake principle is: rotating the operating handle pushes the transmission components, which in turn moves the push rod piston in the hydraulic brake mechanism. Alternatively, the operating handle directly pushes the push rod piston in the hydraulic brake mechanism, which compresses the hydraulic fluid in the hydraulic brake mechanism, driving the hydraulic fluid to move the brake caliper, thereby achieving braking.

[0004] Existing hydraulic brake systems have push rods and pistons that directly contact transmission components or operating handles. This can easily cause wear and tear at the contact points with these components or handles over extended use, leading to damage to the push rod and piston, affecting braking. Directly replacing the push rod and piston is expensive and inconvenient to repair. Furthermore, existing hydraulic brake systems are mounted on the head of the operating handle, making the head bulky and complex, and making gripping the handle uncomfortable. Furthermore, bicycles typically have two hydraulic brake systems, which are not interchangeable. Summary of the Invention

[0005] The purpose of the present disclosure is to overcome the above-mentioned problems and provide a hydraulic brake device for bicycle hydraulic braking. The hydraulic brake device does not directly contact the transmission parts or the operating handle, can avoid wear of the push rod piston, is very convenient to maintain, and does not need to replace the push rod piston.

[0006] Another object of the present disclosure is to provide a bicycle hydraulic brake operating device.

[0007] Yet another object of the present disclosure is to provide a bicycle comprising the hydraulic brake device.

[0008] The purpose of this disclosure is achieved through the following technical solutions:

[0009] A hydraulic brake device for bicycle hydraulic braking comprises a cylinder, a push rod piston and a return spring; one end of the push rod piston reciprocates in the cylinder by overcoming the elastic force of the return spring; the other end of the push rod piston is provided with a push rod head.

[0010] In some embodiments, the push rod head and the push rod piston are connected via a detachable structure.

[0011] In some embodiments, the detachable structure is one of an interference connection structure, a threaded connection structure, and an adhesive structure.

[0012] In some embodiments, the interference connection structure includes a mounting hole provided on the push rod piston and a mounting rod provided on the push rod head, and the mounting hole is interference connected to the mounting rod.

[0013] In some embodiments, the putter head is integrally formed with the mounting rod.

[0014] In some embodiments, the threaded connection structure includes a threaded hole provided on the push rod piston and a screw provided on the push rod head, and the screw and the threaded hole are cooperatively connected with each other.

[0015] In some embodiments, the hydraulic brake device has a symmetrical structure.

[0016] In some embodiments, the push rod head is a metal push rod head and the piston is a plastic push rod piston.

[0017] In some embodiments, the hydraulic brake device also includes a breathing rubber and a sealing cover, an oil cylinder and an oil replenishing chamber are provided in the cylinder body, the oil replenishing chamber is connected to the oil cylinder, and the push rod piston is slidably connected to the oil cylinder; the breathing rubber is arranged at the upper end of the oil replenishing chamber, and the sealing cover is arranged at the upper end of the breathing rubber, the sealing cover is fixedly connected to the cylinder body, and an air vent is provided on the sealing cover; an oil filling hole is provided at the front end of the cylinder body, and the oil filling hole is connected to the oil replenishing chamber; a sealing bolt is provided at the opening of the oil filling hole, and the sealing bolt is used to install the sealing cover on the cylinder body and to seal the oil filling hole; the rear end of the cylinder body is fixed to the sealing cover by a fixing screw; two oil outlet holes are symmetrically provided on the upper part of the cylinder body, the two oil outlet holes are connected to the oil cylinder, and the outlet of the oil outlet hole is sealed by a sealing member; the oil cylinder and the oil replenishing chamber are connected through the oil replenishing hole and the lubricating oil hole.

[0018] A bicycle hydraulic brake operating device comprises a bracket, an operating handle and the above-mentioned hydraulic brake device; wherein

[0019] The operating handle is rotatably connected to the bracket; the hydraulic brake device is a symmetrical structure and is arranged inside the bracket; a driving rod is provided on the bracket, and the head end of the driving rod is in contact with the operating handle; the tail end of the driving rod is in contact with the hydraulic brake device, and the driving rod is used to receive the driving force of the operating handle.

[0020] In some embodiments, the driving rod is rotatably mounted on the bracket, and rolling elements are provided at both ends of the driving rod. The rolling element at the head end contacts the operating handle, and the rolling element at the tail end contacts the hydraulic brake device.

[0021] In some embodiments, the rolling element is a rolling bearing.

[0022] In some embodiments, a speed change operating device is provided at the head of the operating handle.

[0023] In some embodiments, the operating handle includes a base and a handle body; the base is rotatably disposed on the bracket, and the handle body is rotatably disposed on the base; and the rolling element at the head end of the driving rod is in contact with the base.

[0024] In some embodiments, an extension drive portion is provided on the base, and the extension drive portion contacts a rolling element at the head end of the drive rod.

[0025] In some embodiments, a mounting cavity is provided on the bracket; the hydraulic brake device is fixed in the mounting cavity via a positioning shaft.

[0026] In some embodiments, the distal end of the drive rod is in contact with the push rod piston.

[0027] A bicycle comprises the above-mentioned hydraulic brake device.

[0028] A bicycle comprises the above-mentioned hydraulic brake operating device.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The hydraulic brake device disclosed herein, by providing a push rod head on the push rod piston, can prevent the push rod piston from directly contacting the transmission component or the operating handle during braking, thereby preventing the push rod piston from being worn.

[0031] 2. In the hydraulic brake device disclosed herein, when braking, the push rod head will directly contact the transmission component or the operating handle. During long-term use, if the push rod head is worn, the push rod head can be directly replaced without replacing the push rod piston. Maintenance is very convenient and maintenance costs are reduced.

[0032] 3. The hydraulic brake operating device disclosed in the present invention is installed inside the bracket, so that the hydraulic brake operating device has high overall strength, simpler structure, and smaller size. When braking, holding the operating handle does not affect the feel of the upper handle, thereby improving the safety and comfort of road bicycle braking.

[0033] 4. The brake operating device disclosed in the present invention has a hydraulic brake device that is independently installed inside the bracket and is easy to disassemble, replace and maintain.

[0034] 5. The hydraulic brake operating device disclosed in the present invention has a symmetrical structure and can be universally installed on the brackets at the left and right ends of the bicycle handlebars. It has strong compatibility and reduces manufacturing complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 1-3 are schematic structural diagrams of a specific embodiment of a hydraulic brake device for bicycle hydraulic braking in the present disclosure, wherein FIG1 is a three-dimensional view, FIG2 is a top view, and FIG3 is a cross-sectional view.

[0036] FIG. 4 is an exploded view of the push rod piston and the push rod head according to the present disclosure.

[0037] FIG5 is a schematic structural diagram of the hydraulic brake device in the present disclosure in a working state.

[0038] FIG6 is a schematic structural diagram of one specific embodiment of a hydraulic brake operating device for a road bicycle in the present disclosure.

[0039] FIG. 7 is a schematic diagram of the internal structure of the hidden conduit of the hydraulic brake operating device in the present disclosure.

[0040] 8 to 11 are schematic structural diagrams of the hidden conduit and bracket of the hydraulic brake operating device disclosed in the present invention, wherein FIG3 is a main view, FIG4 to FIG5 are stereoscopic views from different viewing directions, and FIG6 is an exploded view.

[0041] FIG12 is a schematic diagram of the three-dimensional structure of the driving rod in the present disclosure.

[0042] FIG13 is a schematic diagram of a three-dimensional structure of a drive rod installed with a kit in the present disclosure.

[0043] FIG14 is a schematic structural diagram of the connection between the hydraulic brake device and the conduit in the present disclosure.

[0044] FIG15 is a cross-sectional view of the hydraulic brake device of the present disclosure. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is further described below in conjunction with examples and drawings, but the embodiments of the present disclosure are not limited thereto.

[0046] An embodiment of the present disclosure provides a hydraulic brake operating device for bicycle hydraulic brakes, comprising a bracket 1, an operating handle 2 and a hydraulic brake device 3; wherein the operating handle 2 is rotatably connected to the bracket 1, the hydraulic brake device 3 is arranged inside the bracket 1, and a driving rod 4 is provided on the bracket 1, the head end of the driving rod 4 is in contact with the operating handle 2; the tail end of the driving rod 4 is in contact with the hydraulic brake device 3, and the driving rod 4 is used to receive the driving force of the operating handle 2.

[0047] 1 to 5 , the hydraulic brake device 3 includes a cylinder 301 , a push rod piston 302 and a return spring 303 ; one end of the push rod piston 302 reciprocates in the cylinder 301 by overcoming the elastic force of the return spring 303 ; the other end of the push rod piston 302 is provided with a push rod head 304 .

[0048] 1-5 , the push rod head 304 is connected to the push rod piston 302 via a detachable structure. This allows for easy detachment of the push rod head 304 and the push rod piston 302. If the push rod head 304 becomes damaged by friction, it can simply be removed and replaced with a new one, resulting in low cost and easy maintenance.

[0049] 1 to 5 , the push rod head 304 is coaxially arranged with the push rod piston 302 .

[0050] 1 to 5 , the detachable structure is an interference fit structure, which improves the stability of installation and makes disassembly very convenient.

[0051] 1-5 , the interference fit structure includes a mounting hole 305 provided on the push rod piston 302 and a mounting rod 306 provided on the push rod head 304. The mounting hole 305 is interference fit with the mounting rod 306. The provision of the mounting rod 306 and the mounting hole 305 facilitates both machining and installation. The mounting rod 306 can be simply inserted into the mounting hole 305, providing a very stable installation. When disassembly is required, the mounting rod 306 can be easily pulled out with a slight force, making disassembly very convenient.

[0052] 1 to 5 , the push rod head 304 and the mounting rod 306 are integrally arranged to form a mushroom nail structure, which aims to make the structure more compact and simple.

[0053] 1 to 5 , the push rod head 304 is provided with a rounded corner at one end away from the push rod piston 302 .

[0054] Referring to Figure 2, the hydraulic brake device is a symmetrical structure. Its purpose is to realize universal installation of the hydraulic brake device on the left and right hand shifts.

[0055] 1-5 , the push rod head 304 is a metal push rod head, and the piston is a plastic push rod piston. The metal push rod head improves the wear resistance of the push rod head 304, and the plastic push rod piston makes the push rod piston 302 softer, thereby preventing the push rod piston 302 from rubbing against the cylinder wall of the cylinder body 301 and damaging the cylinder wall.

[0056] 1 to 5 , the hydraulic brake device further comprises a breathing rubber 307 and a sealing cover 308. An oil cylinder 309 and an oil replenishing chamber 310 are provided in the cylinder body 301. The oil replenishing chamber 310 is communicated with the oil cylinder 309, and the push rod piston 302 is slidably connected to the oil cylinder 309. The breathing rubber 307 is provided at the upper end of the oil replenishing chamber 310, and the sealing cover 308 is provided at the upper end of the breathing rubber 307. The sealing cover 308 is fixedly connected to the cylinder body 301, and an air vent 311 is provided on the sealing cover 308. An oil filling hole 312 is provided at the front end of the cylinder body 301. The oil filling chamber 310 is connected to the oil filling chamber 310. The opening of the oil filling hole 312 is provided with a sealing bolt 313, which is used to install the sealing cover 308 on the cylinder body 301 and seal the oil filling hole 312. The rear end of the cylinder body 301 is fixed to the sealing cover 308 by a fixing screw 314. Two oil outlet holes 315 are symmetrically provided on the upper surface of the cylinder body 301. These two oil outlet holes 315 are connected to the oil cylinder 309, and the outlet of each oil outlet hole 315 is sealed by a sealing member 317. The oil cylinder 309 and the oil filling chamber 310 are connected through the oil filling hole 318 and the lubricating oil hole 319. When the hydraulic brake device of this embodiment is installed on a bicycle, the seal 317 at the outlet of one of the oil outlet holes 315 is removed, and then the guide tube 316 is installed at the outlet of the oil outlet hole 315. During braking, the push rod piston 302 moves within the cylinder 309 against the force of the return spring 303, pushing the hydraulic fluid within the cylinder 309 into motion. The hydraulic fluid then flows through the oil outlet 315 into the conduit 316, and then into the brake caliper, driving the caliper to brake. The provision of an oil replenishment chamber 310 allows for the hydraulic fluid in the cylinder 309 to be compensated. The provision of a vent hole 311 ensures that the pressure applied to the top of the breather rubber 307 is at atmospheric pressure, thereby accommodating changes in the amount of hydraulic fluid within the oil replenishment chamber 310. The provision of an oil filling hole 312 allows for replenishment of the hydraulic fluid. The provision of two oil outlet holes 315 allows the conduit 316 to be installed in the appropriate oil outlet hole 315, depending on the different mounting orientations of the left and right hand levers. The hydraulic fluid entering the cylinder 309 through the lubricating oil hole 319 lubricates the push rod piston 302.

[0057] 1 to 5 , the structure of the sealing member 317 may be the same as that of the sealing bolt 313 .

[0058] 3 , the return spring 303 is disposed in the oil cylinder 309 , with one end acting on the end of the oil cylinder 309 and the other end acting on the push rod piston 302 .

[0059] 3-4 , the push rod piston 302 includes a piston portion 321 and a push rod portion 322. The piston portion 321 is slidably connected to the oil cylinder 309, and the push rod portion 322 is connected to the push rod head 304. This is to make the structure more compact.

[0060] 1 to 7 , the working principle of the hydraulic brake device 3 for bicycle hydraulic braking is as follows:

[0061] When braking, the operating handle 2 rotates, driving the transmission component 4 to move, and the transmission component 4 contacts the push rod head 304; or the operating handle 2 directly contacts the push rod head 304, driving the push rod head 304 and the push rod piston 302 to move together; the push rod piston 302 will overcome the elastic force of the return spring 303 and move in the cylinder body 301, pushing the hydraulic fluid in the cylinder body 301 to move, and the hydraulic fluid drives the brake caliper to move, thereby achieving braking.

[0062] In some embodiments, the detachable structure is a threaded connection structure. The threaded connection structure is very convenient for installing and removing the push rod head 304 and the push rod piston 302, and after installation, the connection between the push rod head 304 and the push rod piston 302 is very stable.

[0063] The threaded connection structure includes a threaded hole provided on the push rod piston 302 and a screw provided on the push rod head 304, wherein the screw and the threaded hole are connected in a cooperative manner.

[0064] The axis of the threaded hole coincides with the axis of the push rod piston 302 .

[0065] The push rod head 304 and the screw rod are integrally formed into a bolt. In the above structure, the push rod piston 302 is directly installed in the threaded hole by the bolt, which can prevent the push rod piston 302 from directly contacting the transmission component 4 or the operating handle 2. The bolt is cheap, which further reduces production cost and maintenance cost.

[0066] The position of the threaded hole is the same as that of the mounting hole 305 , and the position of the screw rod is the same as that of the mounting rod 306 .

[0067] In some embodiments, the detachable structure can also be an adhesive structure or a snap-fit ​​structure. Providing an adhesive structure can also ensure installation stability and facilitate installation and removal. The adhesive structure is an adhesive member, and the push rod piston 302 and the push rod head 304 are adhered to each other by the adhesive member. The adhesive member can be glue, double-sided tape, etc.

[0068] The bicycle disclosed herein includes the hydraulic brake device 3 as described above; the bicycle also includes a handlebar, and hand shifts are provided at the left and right ends of the handlebar, as shown in Figures 6 and 7. The hand shifts include a bracket 1 and an operating handle 2. The bracket 1 is installed on the handlebar, and the operating handle 2 is hinged on the bracket 1.

[0069] 6 and 7 , the hydraulic brake device 3 is disposed inside the bracket 1 .

[0070] 6 and 7 , the head of the operating handle 2 is integrated with a speed change device 9 to achieve speed adjustment of the bicycle.

[0071] 6 and 7 , the bracket 1 may be provided with a transmission component 4 , which is a driving rod rotatably connected to the bracket 1 .

[0072] In some embodiments, the bicycle is a road bicycle.

[0073] The hydraulic brake operating device of the present disclosure will now be described with reference to FIG. 6 to FIG. 15 .

[0074] Referring to Figures 6-11 and 14-15 , the hydraulic brake device 3 has a symmetrical structure. This ensures that the hydraulic brake device 3 can be universally installed on the left and right hydraulic brake operating devices (hand shifters) on a road bicycle handlebar. This reduces manufacturing complexity, enhances the adaptability of the hydraulic brake device 3, and reduces production costs.

[0075] 6 to 11 , the operating handle 2 is hinged to the front end of the bracket 1 via a brake shaft 5 , and the driving rod 4 is rotatably connected to the bracket 1 via a mounting shaft 6 .

[0076] 6-7 , the hydraulic brake device 3 is connected to the wheel brake equipment via a conduit 316 , and hydraulic fluid is transported via the conduit 316 to form a brake hydraulic fluid circuit. The brake equipment is a brake caliper.

[0077] Referring to Figures 6-13 , the drive rod 4 is rotatably mounted on the bracket 1 , and rolling elements 7 are provided at both ends of the drive rod 4 . The rolling element 7 at the head end contacts the operating handle 2 , while the rolling element 7 at the tail end contacts the hydraulic brake device 3 . The provision of the rolling elements 7 allows the drive rod 4 to move more smoothly when the operating handle 2 applies the brake, ensuring smooth braking operation.

[0078] 6 to 13 , the rolling element 7 is a rolling bearing. In the above structure, the rolling bearing can greatly reduce the friction with the operating handle and the hydraulic brake device 3, ensuring that the driving rod 4 moves more smoothly.

[0079] 6 to 13 , the rolling element 7 may also be a shaft sleeve.

[0080] Referring to Figures 6-10, the head of the operating handle 2 is provided with a speed shift operating device 9. In the above structure, by providing the speed shift operating device 9, gear switching can be achieved, thereby realizing the speed shifting operation of the road bicycle; the hydraulic brake device 3 is disposed inside the bracket 1, and the speed shift operating device 9 is disposed at the head of the operating handle 2, so that the hydraulic brake device 3 and the speed shift operating device 9 are disposed independently of each other. Compared with the prior art in which both the hydraulic brake device and the speed shift operating device are disposed at the head of the operating handle, the structure disclosed herein becomes simpler and smaller in size. The specific structure of the speed shift operating device 9 can be referred to the prior art utility model patent with authorization announcement number CN 205256577 U.

[0081] Referring to Figures 6 to 11, the operating handle 2 includes a base 2-1 and a handle body 2-2; the base 2-1 is rotatably mounted on the bracket 1 via the brake shaft 5, and the handle body 2-2 is rotatably mounted on the base 2-1; the rolling element 7 at the head end of the drive rod 4 is in contact with the base 2-1. In the above structure, when braking, holding the handle body 2-2 will cause the handle body 2-2 and the base 2-1 to rotate around the bracket 1 together, and the base 2-1 will drive the drive rod 4 to move, causing the rolling element 7 at the end of the drive rod 4 to trigger the hydraulic brake device 3; when shifting gears, by moving the handle body 2-2, the handle body 2-2 will rotate around the base 2-1, driving the speed change operating device 9 to move, thereby achieving the shifting operation.

[0082] Referring to Figures 6-11 , the base 2-1 is provided with an extension drive unit 2-11, which contacts the rolling element 7 at the head end of the drive rod 4. By providing the extension drive unit 2-11, when braking, the base 2-1 rotates on the bracket 1, and the extension drive unit 2-11 thereon rotates with it. The extension drive unit 2-11 pushes the rolling element 7 at the head end, driving the drive rod 4 to move, thereby triggering the hydraulic brake device 3.

[0083] 12-13 , the drive rod 4 is in a “<” shape, and the mounting shaft 6 passes through the bend of the drive rod 4. This is to make the structure of the drive rod 4 more compact, facilitate the installation of the drive rod 4 in the bracket 1, and also better drive the hydraulic brake device 3.

[0084] Referring to Figures 12-13, the drive rod 4 has a symmetrical structure. The head end of the drive rod 4 is a U-shaped structure. Both sides of the U-shaped structure are provided with holes for installing the rolling element 7. The purpose is that according to the different installation directions of the hydraulic brake operating devices at the left and right ends of the road bicycle, the rolling element 7 can be installed on different sides of the U-shaped structure, thereby improving the applicability of the drive rod 4.

[0085] 12-13 , a sleeve 10 is provided on the outside of the driving rod 4 , the purpose of which is to improve the strength of the driving rod 4 .

[0086] Referring to Figures 8 and 12-13, the extended drive unit 2-11 passes through the space between the rolling element 7 at the head end and the mounting shaft 6 and extends to the rear of the rolling element 7 at the head end. This is to make the structure more compact. From the perspective of Figure 8, when braking, the base 2-1 rotates clockwise on the bracket 1, and the extended drive unit 2-11 thereon rotates clockwise together. The extended drive unit 2-11 pushes the rolling element 7 at the head end, driving the drive rod 4 to rotate clockwise as well. The rolling element 7 at the end of the drive rod 4 triggers the hydraulic brake device 3.

[0087] Referring to Figures 6-11 , the bracket 1 is provided with a mounting cavity 1-1; the hydraulic brake device 3 is secured within the mounting cavity 1-1 via a positioning shaft 27. In the above configuration, installing the hydraulic brake device 3 within the mounting cavity 1-1 makes the entire hydraulic brake operating device more compact. The hydraulic brake device 3 can be installed within the mounting cavity 1-1 from front to back or from top to bottom. The rear end of the mounting cavity 1-1 serves to limit the hydraulic brake device 3, while the front end is secured via the positioning shaft 27, resulting in an extremely simple mounting method.

[0088] Referring to Figures 7 and 14-15, the hydraulic brake device 3 includes a cylinder body 301, a push rod piston 302, and a return spring 303. An oil cylinder 309 is located within the cylinder body 301. The push rod piston 302 reciprocates within the oil cylinder 309 by overcoming the elastic force of the return spring 303. The rolling element 7 at the end of the drive rod 4 contacts the push rod piston 302. In this structure, when braking, the operating handle 2 drives the drive rod 4 to move. The rolling element 7 at the end of the drive rod 4 drives the push rod piston 302 to move. The push rod piston 302 overcomes the elastic force of the return spring 303 and moves within the oil cylinder 309, driving the hydraulic fluid within the oil cylinder 309. The hydraulic fluid enters the brake system (i.e., the brake caliper) through a conduit 316, thereby driving the brake system (i.e., the brake caliper) on the road bicycle wheel, achieving braking. After braking, the elastic force of the return spring 303 resets the push rod piston 302.

[0089] 15 , the push rod piston 302 includes a piston portion 321 and a push rod portion 322 . The piston portion 321 is movably connected to the oil cylinder 309 , and the rolling element 7 at the end of the driving rod 4 is in contact with the push rod portion 322 .

[0090] 6 to 12 , the working principle of the above-mentioned road bicycle hydraulic brake operating device is as follows:

[0091] When braking, hold the operating handle 2, and the operating handle 2 rotates around the bracket 1. The driving force of the operating handle 2 will be transmitted to the driving rod 4, driving the driving rod 4 to move. The moving driving rod 4 will trigger the hydraulic brake device 3 to work, thereby braking the road bicycle.

[0092] The present disclosure also relates to a bicycle comprising the above-mentioned hydraulic brake operating device, wherein the hydraulic brake operating devices are provided in pairs and are respectively arranged at the left and right ends of the handlebar.

[0093] The above is a preferred embodiment of the present disclosure, but the embodiment of the present disclosure is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present disclosure should be considered as equivalent replacement methods and are included in the scope of protection of the present disclosure.

Claims

1. A hydraulic brake device for bicycle hydraulic braking, comprising a cylinder, a push rod piston and a return spring; one end of the push rod piston reciprocates in the cylinder by overcoming the elastic force of the return spring; the other end of the push rod piston is provided with a push rod head.

2. A hydraulic brake device for bicycle hydraulic braking according to claim 1, wherein the push rod head is connected to the push rod piston via a detachable structure.

3. A hydraulic brake device for bicycle hydraulic braking according to claim 2, wherein the detachable structure is one of an interference connection structure, a threaded connection structure and an adhesive structure.

4. A hydraulic brake device for bicycle hydraulic brakes according to claim 3, wherein the interference connection structure comprises a mounting hole arranged on the push rod piston and a mounting rod arranged on the push rod head, and the mounting hole is interference connected with the mounting rod.

5. A hydraulic brake device for bicycle hydraulic braking according to claim 4, wherein the push rod head is integrally arranged with the mounting rod.

6. A hydraulic brake device for bicycle hydraulic brakes according to claim 3, wherein the threaded connection structure comprises a threaded hole arranged on the push rod piston and a screw rod arranged on the push rod head, and the screw rod and the threaded hole are cooperatively connected with each other.

7. A hydraulic brake device for bicycle hydraulic braking according to claim 1, wherein the hydraulic brake device is a symmetrical structure.

8. A hydraulic brake device for bicycle hydraulic braking according to claim 1, wherein the push rod head is a metal push rod head, and the piston is a plastic push rod piston.

9. A hydraulic brake device for bicycle hydraulic brake according to claim 1, wherein the hydraulic brake device also includes a breathing rubber and a sealing cover, wherein an oil cylinder and an oil replenishing chamber are provided in the cylinder body, the oil replenishing chamber is communicated with the oil cylinder, and the push rod piston is slidably connected with the oil cylinder; the breathing rubber is arranged at the upper end of the oil replenishing chamber, the sealing cover is arranged at the upper end of the breathing rubber, the sealing cover is fixedly connected with the cylinder body, and the sealing cover is provided with an air vent; an oil filling hole is provided at the front end of the cylinder body, and the oil filling hole is communicated with the oil replenishing chamber; a sealing bolt is provided at the opening of the oil filling hole, and the sealing bolt is used to install the sealing cover on the cylinder body and to seal the oil filling hole; the rear end of the cylinder body is fixed to the sealing cover by a fixing screw; two oil outlet holes are symmetrically arranged on the upper side of the cylinder body, the two oil outlet holes are communicated with the oil cylinder, and the outlet of the oil outlet hole is sealed by a sealing member; the oil cylinder and the oil replenishing chamber are communicated through the oil filling hole and the lubricating oil hole.

10. A bicycle hydraulic brake operating device, comprising a bracket, an operating handle and the hydraulic brake device according to claim 1; wherein The operating handle is rotatably connected to the bracket; the hydraulic brake device is a symmetrical structure and is arranged inside the bracket; a driving rod is provided on the bracket, and the head end of the driving rod is in contact with the operating handle; the rear end of the driving rod is in contact with the hydraulic brake device, and the driving rod is used to receive the driving force of the operating handle.

11. The hydraulic brake operating device according to claim 10, wherein the drive rod is rotatably arranged on the bracket, and rolling elements are provided at both ends of the drive rod, the rolling element at the head end contacts the operating handle, and the rolling element at the tail end contacts the hydraulic brake device.

12. The hydraulic brake operating device according to claim 11, wherein the rolling element is a rolling bearing.

13. The hydraulic brake operating device according to claim 10, wherein a speed change operating device is provided at the head of the operating handle.

14. The hydraulic brake operating device according to claim 11, wherein the operating handle comprises a base and a handle body; the base is rotatably disposed on the bracket, and the handle body is rotatably disposed on the base; and the rolling element at the head end of the driving rod is in contact with the base. 15 . The hydraulic brake operating device according to claim 14 , wherein an extension driving portion is provided on the base, and the extension driving portion contacts the rolling element at the head end of the driving rod.

16. The hydraulic brake operating device according to claim 10, wherein the bracket is provided with a mounting inner cavity; the hydraulic brake device is fixed in the mounting inner cavity via a positioning shaft.

17. The hydraulic brake operating device according to claim 10, wherein a distal end of the drive rod contacts the push rod piston.

18. A bicycle comprising the hydraulic brake device according to any one of claims 1 to 9.

19. A bicycle comprising the hydraulic brake operating device according to any one of claims 10 to 17.

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