Hydraulic braking device, hydraulic brake actuation device and two-wheeler

Abstract

Disclosed are a hydraulic brake device, a hydraulic brake actuation device, and a two-wheeled vehicle. The hydraulic brake device comprises a cylinder body, a pushrod piston, and a return spring. One end of the pushrod piston moves back and forth within the cylinder body, overcoming the elastic force of the return spring. A pushrod head is provided at the other end of the pushrod piston.The hydraulic brake actuation device comprises a carrier, an actuating lever and the hydraulic brake device, wherein the actuating lever is rotatably connected to the carrier; the hydraulic brake device is symmetrically constructed and provided within the carrier; a drive rod is arranged on the carrier, wherein the head end of the drive rod is in contact with the actuating lever and the rear end of the drive rod is in contact with the hydraulic brake device; the drive rod serves to receive a drive force from the actuating lever.

Description

Technical field

[0001] The present disclosure relates to braking devices for two-wheelers, in particular a hydraulic braking device for hydraulic two-wheeler braking and a two-wheeler. background

[0002] The bicycle market has boomed in recent years. Both high-quality racing bikes and mass-market bicycles used for commuting and leisure are very popular with consumers.

[0003] Bicycle brakes are generally divided into cable-operated brakes and hydraulic brakes. The braking principle of hydraulic brakes is explained below. When the operating lever is turned, it pushes a transmission component to move it, which in turn drives the pushrod piston inside the hydraulic brake mechanism to move. Alternatively, the operating lever pushes directly on the pushrod piston in the hydraulic brake mechanism to move it. The pushrod piston then compresses the hydraulic fluid within the hydraulic brake mechanism, which in turn drives the movement of the brake caliper, thus achieving braking.

[0004] In previous hydraulic brake systems, the pushrod piston is in direct contact with a transmission component or the actuating lever. With prolonged use, the contact surfaces between the pushrod piston and the transmission component or actuating lever are prone to wear, leading to damage of the pushrod piston and impaired braking performance. Directly replacing the pushrod piston is expensive and impractical for maintenance. Furthermore, the previous hydraulic brake system is mounted at the head of the actuating lever, resulting in an increased volume of the lever head and a more complex structure. This makes the grip uncomfortable when holding the lever in the upper position.Furthermore, two-wheelers are generally equipped with two hydraulic brake devices, and the two hydraulic brake devices are not universal and therefore cannot be replaced. Summary

[0005] The aim of this disclosure is to overcome the aforementioned problems and to provide a hydraulic braking device for hydraulic two-wheel braking. The hydraulic braking device does not come into direct contact with a transmission component or an actuating lever, thus avoiding wear on a pushrod piston and making maintenance very convenient without the need to replace the pushrod piston.

[0006] Another objective of the present disclosure is to provide a hydraulic brake actuation device for hydraulic two-wheel braking.

[0007] A further objective of the present disclosure is to provide a two-wheeler that includes the hydraulic braking device described above.

[0008] The objectives of this disclosure are achieved through the following technical solutions.

[0009] A hydraulic brake device for hydraulic two-wheel braking, comprising a cylinder body, a pushrod piston and a return spring, wherein one end of the pushrod piston moves back and forth in the cylinder body overcoming an elastic force of the return spring and a pushrod head is provided at the other end of the pushrod piston.

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

[0011] In some embodiments, the detachable structure is a press-fit structure, a screw-in structure, or a connecting structure.

[0012] In some embodiments, the interference fit structure comprises a mounting opening provided on the pushrod piston and a mounting rod provided on the pushrod head, and the mounting opening is in an interference fit with the mounting rod.

[0013] In some embodiments, the push rod head is integrally provided with the mounting rod.

[0014] In some embodiments, the screwing structure comprises a threaded bore provided on the pushrod piston and a threaded rod provided on the pushrod head, and the threaded rod engages in a matching engagement with the threaded bore.

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

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

[0017] In some embodiments, the hydraulic brake device further comprises a vent rubber and a sealing cover; the cylinder body is provided with an oil cylinder and an oil compensation chamber; the oil compensation chamber is connected to the oil cylinder; and the pushrod piston is slidably connected to the oil cylinder. The vent rubber is provided at the upper end of the oil compensation chamber; the sealing cover is provided at the upper end of the vent rubber; the sealing cover is fixedly connected to the cylinder body; and the sealing cover is provided with a vent opening. The front end of the cylinder body is provided with an oil filling opening, and the oil filling opening is connected to the oil compensation chamber.One opening of the oil filler port is fitted with a sealing bolt, which is configured to secure the sealing cover to the cylinder body and seal the oil filler port. The rear end of the cylinder body and the sealing cover are secured by a fastening screw. The cylinder body is symmetrically provided with two oil outlet ports; these two oil outlet ports are connected to the oil cylinder; and one outlet of the oil outlet port is sealed by a sealing element. The oil cylinder and the oil equalization chamber are connected to each other via an oil equalization port and a lubricating oil port.

[0018] A hydraulic two-wheel brake actuation device comprising a carrier, an actuating lever and the aforementioned hydraulic brake device.

[0019] The actuating lever is rotatably connected to the carrier; the hydraulic brake device is symmetrically constructed and provided within the carrier; a drive rod is provided on the carrier; the head end of the drive rod is in contact with the actuating lever; the rear end of the drive rod is in contact with the hydraulic brake device; and the drive rod is configured to receive a drive force from the actuating lever.

[0020] In some embodiments, the drive rod is rotatably mounted on the support; the front end and the rear end of the drive rod are each provided with a roller element; the roller element at the front end is in contact with the actuating lever; and the roller element at the rear end is in contact with the hydraulic brake device.

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

[0022] In some embodiments, the head of the actuating lever is provided with a gearshift device.

[0023] In some embodiments, the actuating lever comprises a base and a lever body; the base is rotatably mounted on the support; the lever body is rotatably mounted on the base; and the rolling element at the head end of the drive rod is in contact with the base.

[0024] In some embodiments, the base is provided with an extended drive section, and the extended drive section is in contact with the rolling element at the head end of the drive rod.

[0025] In some embodiments, the carrier is provided with an installation cavity; and the hydraulic brake device is attached to the installation cavity by a positioning shaft.

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

[0027] A two-wheeler that includes the aforementioned hydraulic braking device.

[0028] A two-wheeler that includes the aforementioned hydraulic two-wheel brake actuation device.

[0029] Compared to the prior art, the present disclosure has the following advantageous effects. 1. The hydraulic brake device of the present disclosure is provided with a pushrod head on the pushrod piston, so that the pushrod piston can be prevented from coming into direct contact with the transmission component or the actuating lever during the braking process, thereby avoiding wear of the pushrod piston. 2. In the hydraulic braking device of the present disclosure, the pushrod head comes into direct contact with the transmission components or the actuating lever during the braking process. In case of wear due to long-term use, the pushrod head can be replaced directly without having to replace the pushrod piston. This makes maintenance very convenient and reduces maintenance costs. 3. In the hydraulic braking device of the present disclosure, the hydraulic braking device is installed within the carrier, so that the hydraulic brake actuation device has high overall strength, a simpler design, and a smaller volume. During the braking process, the actuation of the lever does not affect the grip feel when gripping the handlebars in the aero position, thereby improving safety and comfort when braking road bicycles. 4. In the hydraulic braking device of the present disclosure, the hydraulic braking device is installed independently within the carrier, making it easy to disassemble, replace and maintain. 5. In the hydraulic brake device of the present disclosure, the hydraulic brake device is a symmetrical structure and can be universally installed on the supports at the left and right ends of the two-wheel handlebar, thereby improving compatibility and reducing the complexity of manufacture. Brief description of the drawings The Fig. Figures 1 to 3 are schematic structure diagrams of a specific implementation of a hydraulic braking device for hydraulic two-wheel braking according to the present disclosure, wherein Fig. 1 a perspective view, Fig. 2 a top view and Fig. 3 is a cross-sectional view. Fig. Figure 4 is an exploded view of a pushrod piston and pushrod head according to the present disclosure. Fig. Figure 5 is a schematic structural diagram of a hydraulic brake device in an operating state according to the present disclosure. Fig. Figure 6 is a schematic structure diagram of a specific embodiment of a hydraulic two-wheel brake actuation device for a racing bicycle according to the present disclosure. Fig. Figure 7 is a schematic diagram of an internal structure of the concealed lines of a hydraulic brake actuation device according to the present disclosure. The Fig. Figures 8 to 11 are schematic structural diagrams of the concealed lines and the carrier of a hydraulic brake actuation device according to the present disclosure, wherein Fig. 3 is a front view, which Fig. 4 to 5 perspective views from different viewpoints are included and Fig. 6 is an exploded view. Fig. Figure 12 is a three-dimensional structural diagram of a drive rod according to the present disclosure. Fig. Figure 13 is a three-dimensional structural diagram of a drive rod equipped with a sleeve according to the present disclosure. Fig. Figure 14 is a schematic structural diagram of the connection between a hydraulic brake device and a line according to the present disclosure. Fig. Figure 15 is a cross-sectional view of a hydraulic brake device according to the present disclosure. Detailed description

[0030] To enable experts to fully understand the technical solutions of this disclosure, the present disclosure is described in more detail below with reference to embodiments and drawings. However, the implementations of the present disclosure are not limited to these.

[0031] One embodiment of the present disclosure provides a hydraulic brake actuation device for hydraulic two-wheel braking, comprising a carrier 1, an actuating lever 2, and a hydraulic brake device 3. The actuating lever 2 is rotatably connected to the carrier 1; the hydraulic brake device 3 is provided within the carrier 1; the carrier 1 is provided with a drive rod 4; and the head end of the drive rod 4 is in contact with the actuating lever 2. The rear end of the drive rod 4 is in contact with the hydraulic brake device 3, and the drive rod 4 is configured to receive a drive force from the actuating lever 2.

[0032] With reference to the Fig. The hydraulic brake device 3 comprises a cylinder body 301, a pushrod piston 302, and a return spring 303. One end of the pushrod piston 302 moves back and forth within the cylinder body 301, overcoming an elastic force exerted by the return spring 303. A pushrod head 304 is provided at the other end of the pushrod piston 302.

[0033] With reference to the Fig. In sections 1 to 5, the pushrod head 304 and the pushrod piston 302 are connected via a detachable structure. The purpose of this detachable structure is to allow for easy disassembly and separation of the pushrod head 304 from the pushrod piston 302. If the pushrod head 304 is worn due to friction, it can be directly disassembled and replaced with a new one, which is cost-effective and eases maintenance.

[0034] With reference to the Fig. In 1 to 5 the push rod head 304 and the push rod piston 302 are arranged coaxially.

[0035] With reference to the Fig. Items 1 through 5 feature a detachable press-fit structure. This press-fit structure improves installation stability and also makes disassembly very convenient.

[0036] With reference to the Fig. The press-fit structure, as described in sections 1 to 5, comprises a mounting opening 305 provided on the pushrod piston 302 and a mounting rod 306 provided on the pushrod head 304, with the mounting opening 305 being in a press fit with the mounting rod 306. By providing the mounting rod 306 and the mounting opening 305, the design not only facilitates machining but also simplifies the installation process. The mounting rod 306 can be inserted directly into the mounting opening 305 and is very stable after installation. If disassembly is required, the mounting rod 306 can be pulled out with minimal effort, making disassembly very convenient.

[0037] With reference to the Fig. In parts 1 to 5, the push rod head 304 is integrally formed with the mounting rod 306 to create a mushroom-shaped nail structure. The purpose is to make the structure more compact and simpler.

[0038] With reference to the Fig. 1 to 5 the pushrod head 304 is provided with a rounded corner at one end that is away from the pushrod piston 302.

[0039] With reference to Fig. 2. The hydraulic brake device is a symmetrical structure. Its purpose is to allow universal installation on both left and right switches.

[0040] With reference to the Fig. 1 to 5 the pushrod head 304 is a metal pushrod head and the piston is a plastic pushrod piston.

[0041] The purpose is that the metal pushrod head increases the wear resistance of the pushrod head 304 and the plastic pushrod piston makes the pushrod piston 302 relatively soft, thus preventing damage to a cylinder wall of the cylinder body 301 from friction with the pushrod piston 302.

[0042] With reference to the Fig. The hydraulic brake device, as described in sections 1 to 5, further comprises a vent rubber 307 and a sealing cover 308, wherein the cylinder body 301 is provided with an oil cylinder 309 and an oil compensation chamber 310; the oil compensation chamber 310 is connected to the oil cylinder 309; and the pushrod piston 302 is slidably connected to the oil cylinder 309. The vent rubber 307 is located at the upper end of the oil compensation chamber 310; the sealing cover 308 is located at the upper end of the vent rubber 307; the sealing cover 308 is fixedly connected to the cylinder body 301; and the sealing cover 308 is provided with a vent opening 311. The front end of the cylinder body 301 is provided with an oil filling opening 312, and the oil filling opening 312 is connected to the oil compensation chamber 310.The opening of the oil filler port 312 is provided with a sealing bolt 313, and the sealing bolt 313 is configured to install the sealing cover 308 on the cylinder body 301 and seal the oil filler port 312. The rear end of the cylinder body 301 and the sealing cover 308 are fixed by a fastening screw 314. The cylinder body 301 is symmetrically provided with two oil outlet ports 315; the two oil outlet ports 315 communicate with the oil cylinder 309; and one outlet of the oil outlet port 315 is sealed by a sealing element 317. The oil cylinder 309 and the oil equalization chamber 310 communicate with each other via an oil equalization port 318 and a lubricating oil port 319.In this embodiment, when the hydraulic brake device is installed on a two-wheeler, the sealing element 317 is removed from the opening of one of the oil outlet ports 315, and then a line 316 is installed at the opening of the oil outlet port 315. During the braking process, the pushrod piston 302 moves within the oil cylinder 309 against the elastic force of the return spring 303 and forces the hydraulic fluid within the oil cylinder 309, causing it to move. The hydraulic fluid flows through the oil outlet 315 into the line 316 and then via the line 316 into a brake caliper, thereby actuating the brake caliper and producing a braking effect. The hydraulic fluid in the oil cylinder 309 can be balanced by the provision of the oil equalization chamber 310.The provision of the vent opening 311 ensures that the pressure exerted on the top of the vent rubber 307 corresponds to atmospheric pressure, thus compensating for changes in the volume of the hydraulic fluid within the oil compensation chamber 310. The provision of the oil filling opening 312 allows the hydraulic fluid to be refilled through the oil filling opening 312. The provision of two oil outlet openings 315 allows the line 316 to be installed in the appropriate oil outlet opening 315, corresponding to the different installation directions of the switching devices at the left and right ends of the two-wheeler. The hydraulic fluid entering the oil cylinder 309 through the lubrication oil opening 319 can be used to lubricate the pushrod piston 302.

[0043] With reference to the Fig. 1 to 5 the structure of the sealing element 317 can be the same as the structure of the sealing bolt 313.

[0044] With reference to Fig. 3 the return spring 303 is provided in the oil cylinder 309, with one end acting on the end of the oil cylinder 309 and the other end acting on the pushrod piston 302.

[0045] With reference to Fig. 3 and Fig. 4. The pushrod piston 302 comprises a piston section 321 and a pushrod section 322. The piston section 321 is slidably connected to the oil cylinder 309, and the pushrod section 322 is connected to the pushrod head 304. The purpose is to make the structure more compact.

[0046] With reference to the Fig. In sections 1 to 7, the working principle of the hydraulic brake device 3 for hydraulic two-wheel braking is explained as follows.

[0047] During the braking process, the actuating lever 2 rotates to move a transmission component 4, and the transmission component 4 comes into contact with the pushrod head 304. Alternatively, the actuating lever 2 comes into direct contact with the pushrod head 304 and drives the pushrod head 304 and the pushrod piston 302 to move together. The pushrod piston 302 moves within the cylinder body 301 against the elastic force of the return spring 303 and forces the hydraulic fluid within the cylinder body 301 to move, and the hydraulic fluid drives the brake caliper to move, thus achieving braking.

[0048] In some embodiments, the detachable structure is a screw-type structure. The screw-type structure makes it very easy to assemble and disassemble the pushrod head 304 and the pushrod piston 302. Furthermore, the connection between the pushrod head 304 and the pushrod piston 302 is very stable after assembly.

[0049] The screw connection comprises a threaded bore provided on the pushrod piston 302 and a threaded rod provided on the pushrod head 304, the threaded rod engaging with the threaded bore. The design of the above structure facilitates disassembly and assembly.

[0050] The axis of the threaded bore coincides with the axis of the pushrod piston 302.

[0051] The pushrod head 304 is integrally formed with the threaded rod to create a bolt. In the above structure, direct bolt mounting in the threaded bore prevents direct contact between the pushrod piston 302 and the transmission component 4 or the actuating lever 2. Additionally, the bolt is cost-effective, further reducing both production and maintenance costs.

[0052] The position of the threaded hole is the same as the position of the mounting opening 305, and the position of the threaded rod is the same as the position of the mounting rod 306.

[0053] In some embodiments, the detachable structure can also be a connecting structure or a snap-fit ​​structure. Providing a connecting structure also ensures the stability of the installation, and assembly and disassembly are very simple. The connecting structure is a connecting element, and the pushrod piston 302 is connected to the pushrod head 304 via the connecting element. The connecting element can be adhesive, double-sided tape, etc.

[0054] The two-wheeled vehicle of the present disclosure comprises the hydraulic brake device 3 described above. The two-wheeled vehicle further comprises a handlebar. Shift levers are provided at the left and right ends of the handlebar. As in Fig. 6 and Fig. As shown in Figure 7, the shift lever comprises a carrier 1 and an actuating lever 2. The carrier 1 is attached to the handlebar, and the actuating lever 2 is hinged to the carrier 1.

[0055] With reference to Fig. 6 and Fig. 7 the hydraulic brake device 3 is provided inside the carrier 1.

[0056] With reference to Fig. 6 and Fig. 7 is the head of the actuating lever 2 with a gearshift device 9 integrated, which allows the speed of the two-wheeler to be adjusted.

[0057] With reference to Fig. 6 and Fig. 7. The carrier 1 can be equipped with a transmission component 4. The transmission component 4 is a drive rod and is rotatably connected to the carrier 1.

[0058] In some versions, the two-wheeler is a racing bike.

[0059] Now, the hydraulic brake actuation device of the present disclosure is described with reference to the Fig. 6 to 15 described.

[0060] With reference to the Fig. 6 to 11 and the Fig. Figures 14 to 15 describe the hydraulic brake device 3 as having a symmetrical structure. Its purpose is to ensure that the hydraulic brake device 3 can be universally installed on the hydraulic brake actuation devices (shifting devices) at the left and right ends of the handlebars of the racing bicycle, thereby reducing manufacturing complexity, improving the applicability of the hydraulic brake device 3, and lowering production costs.

[0061] With reference to the Fig. 6 to 11 the actuating lever 2 is articulated via a brake shaft 5 to the front of the carrier 1, and the drive rod 4 is rotatably connected to the carrier 1 via a mounting shaft 6.

[0062] With reference to Fig. 6 and Fig. 7 The hydraulic brake device 3 is connected to a brake device of a wheel via line 316. The hydraulic fluid is supplied through line 316 to form a brake hydraulic fluid circuit. The brake device is a brake caliper.

[0063] With reference to the Fig. 6 to 13, the drive rod 4 is rotatably mounted on the support 1; the head end and the rear end of the drive rod 4 are each provided with a roller element 7; the roller element 7 at the head end is in contact with the actuating lever 2; and the roller element 7 at the rear end is in contact with the hydraulic brake device 3. The roller elements 7 ensure that the drive rod 4 moves more smoothly when the actuating lever 2 applies a braking action, thus guaranteeing a uniform braking effect.

[0064] With reference to the Fig. From 6 to 13, the rolling element 7 is a rolling bearing. In the above structure, the rolling bearing can significantly reduce the friction between the drive rod and the actuating lever, as well as between the drive rod and the hydraulic brake device 3, thereby ensuring smoother movement of the drive rod 4.

[0065] With reference to the Fig. From 6 to 13, the rolling element 7 can also be a shaft sleeve.

[0066] With reference to the Fig. 6 to 10, the head of the actuating lever 2 is provided with a gearshift actuation device 9. In the above design, a gear change can be achieved by providing the actuating device 9 for changing the speed, thus enabling a change in the speed of the road two-wheeler. The hydraulic brake device 3 is provided within the carrier 1, and the gearshift actuation device 9 is provided on the head of the actuating lever 2, so that the hydraulic brake device 3 and the gearshift actuation device 9 are independent of each other. Compared to the prior art, in which both the hydraulic brake device and the gearshift actuation device are provided on the head of the actuating lever, the structure of the present disclosure is simpler and more compact.The specific structure of the gearshift actuation device 9 may refer to the prior art disclosed in a utility model with publication number CN 205256577 U.

[0067] With reference to the Fig. 6 to 11, the actuating lever 2 comprises a base 2-1 and a lever body 2-2. The base 2-1 is rotatably mounted on the support 1 via the brake shaft 5, and the lever 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 aforementioned configuration, during braking, when the lever body 2-2 is engaged, the lever body 2-2 and the base 2-1 rotate together around the support 1. The base 2-1 drives the drive rod 4, which in turn activates the hydraulic brake device 3 via the rolling element 7 at the rear end of the drive rod 4. During gear changes, actuating the lever body 2-2 rotates the lever body 2-2 around the base 2-1, thereby driving the gearshift mechanism 9 and thus achieving the gear change operation.

[0068] With reference to the Fig. From 6 to 11, the base 2-1 is provided with an extended drive section 2-11, and the extended drive section 2-11 is in contact with the roller element 7 at the front end of the drive rod 4. By providing the extended drive section 2-11, the base 2-1 rotates on the support 1 during the braking process, and the extended drive section 2-11 rotates together with the base 2-1. The extended drive section 2-11 pushes the roller element 7 at the head end and thus drives the movement of the drive rod 4, thereby activating the hydraulic brake device 3.

[0069] With reference to Fig. 12 and Fig. 13 The drive rod 4 is V-shaped, and the mounting shaft 6 passes through an angled section of the V-shaped drive rod 4. The purpose is to make the structure of the drive rod 4 more compact, thereby facilitating the installation of the drive rod 4 in the support 1 and simultaneously achieving more efficient actuation of the hydraulic brake device 3.

[0070] With reference to Fig. 12 and Fig. The drive rod 4 is symmetrically constructed. The head end of the drive rod 4 has a U-shaped structure. Both sides of the U-shaped structure are provided with a hole for installing the roller element 7. The purpose is to allow the roller elements 7 to be installed on different sides of the U-shaped structure, corresponding to the different installation directions of the hydraulic brake actuators at the left and right ends of the road bicycle, thereby improving the applicability of the drive rod 4.

[0071] With reference to Fig. 12 and Fig. 13 a sleeve 10 is attached to the outside of the drive rod 4 to improve the strength of the drive rod 4.

[0072] With reference to Fig. 8 and Fig. From 12 to 13, the extended drive section 2-11 runs through a space between the roller element 7 at the head end and the mounting shaft 6 and extends to the rear of the roller element 7 at the head end. The purpose is to make the structure more compact. With reference to Fig. During braking, base 2-1 rotates clockwise on carrier 1. The extended drive section 2-11 on base 2-1 rotates clockwise accordingly. This rotation of the extended drive section 2-11 pushes the roller element 7 at the head end and drives the drive rod 4 clockwise. The roller element 7 at the rear end of the drive rod 4 then activates the hydraulic brake device 3.

[0073] With reference to the Fig. From 6 to 11, the carrier 1 is provided with an installation cavity 1-1. The hydraulic brake device 3 is secured in the installation cavity 1-1 by a positioning shaft 27. In the above structure, installing the hydraulic brake device 3 in the installation cavity 1-1 allows the entire structure of the hydraulic brake actuation device to be made more compact. The hydraulic brake device 3 can be installed in the installation cavity 1-1 from front to back or from top to bottom. The rear end of the installation cavity 1-1 can define the hydraulic brake device 3, while the front end is fixed by the positioning shaft 27. The fastening method is extremely simple.

[0074] With reference to Fig. 7 and Fig. Figures 14 to 15 describe the hydraulic brake device 3 comprising a cylinder body 301, a pushrod piston 302, and a return spring 303. An oil cylinder 309 is provided in the cylinder body 301, and the pushrod piston 302 moves back and forth within the oil cylinder 309 by overcoming an elastic force exerted by the return spring 303. The rolling element 7 at the rear end of the drive rod 4 is in contact with the pushrod piston 302. In the above design, during the braking process, the actuating lever 2 drives the drive rod 4, and the rolling element 7 at the rear end of the drive rod 4 drives the pushrod piston 302. The pushrod piston 302 moves within the oil cylinder 309 against the elastic force of the return spring 303 and propels the hydraulic fluid within the oil cylinder 309. The hydraulic fluid enters the brake device (i.e., the brake caliper) through line 316, thereby activating the brake device (i.e.,The brake caliper is driven onto the wheel of the road bicycle to move, thereby achieving braking. After the braking process is complete, the pushrod piston 302 is returned to its original position by the elastic force of the return spring 303.

[0075] With reference to Fig. 15 The pushrod piston 302 comprises a piston section 321 and a pushrod section 322. The piston section 321 is movably connected to the oil cylinder 309, and the rolling element 7 at the rear end of the drive rod 4 is in contact with the pushrod section 322.

[0076] With reference to the Fig. The working principle of the hydraulic brake actuation device for the racing bike is as follows, from 6 to 12.

[0077] During the braking process, the actuating lever 2 is gripped. The actuating lever 2 rotates around the carrier 1, and the driving force of the actuating lever 2 is transmitted to the drive rod 4, causing the drive rod 4 to move. The moving drive rod 4 then activates the hydraulic brake device 3, thus braking the racing bike.

[0078] The present disclosure also relates to a two-wheeled vehicle comprising the aforementioned hydraulic brake actuation device. There are two hydraulic brake actuation devices, one located at the left end and the other at the right end of the handlebars.

[0079] The embodiments mentioned above are preferred embodiments of the present disclosure, but the embodiments of the present disclosure are not limited by the above content. All other changes, modifications, substitutions, combinations, and simplifications made without derogation from the spirit and principle of the present disclosure should be equivalent replacements and are included within the scope of the present disclosure. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 205256577 U

[0066]

Claims

[1] A hydraulic brake device for hydraulic two-wheel braking, comprising a cylinder body, a pushrod piston and a return spring, wherein one end of the pushrod piston moves back and forth in the cylinder body by overcoming a spring force of the return spring and a pushrod head is provided at another end of the pushrod piston. [2] The hydraulic brake device for hydraulic two-wheel braking according to claim 1, wherein the pushrod head and the pushrod piston are connected by a detachable structure. [3] The hydraulic brake device for hydraulic two-wheel braking according to claim 2, wherein the releasable structure is a press fit structure, a screw connection structure or a connecting structure. [4] The hydraulic brake device for hydraulic two-wheel braking according to claim 3, wherein the press-fit structure comprises a mounting opening provided on the push rod piston and a mounting rod provided on the push rod head and the mounting opening is in press fit with the mounting rod. [5] The hydraulic brake device for hydraulic two-wheel braking according to claim 4, wherein the push rod head is integrally formed with the mounting rod. [6] The hydraulic brake device for hydraulic two-wheel braking according to claim 3, wherein the screw structure comprises a threaded bore provided on the pushrod piston and a threaded rod provided on the pushrod head and the threaded rod is in a suitable engagement with the threaded bore. [7] The hydraulic brake device for hydraulic two-wheel braking according to claim 1, wherein the hydraulic brake device has a symmetrical structure. [8] The hydraulic brake device for hydraulic two-wheel braking according to claim 1, wherein the pushrod head is a metal pushrod head and the piston is a plastic pushrod piston. [9] The hydraulic brake device for hydraulic two-wheel braking according to claim 1, wherein the hydraulic brake device further comprises a vent rubber and a sealing cover; the cylinder body is provided with an oil cylinder and an oil compensation chamber; the oil compensation chamber is connected to the oil cylinder; and the pushrod piston is slidably connected to the oil cylinder; the vent rubber is provided at an upper end of the oil compensation chamber; the sealing cover is provided at an upper end of the vent rubber; the sealing cover is fixedly connected to the cylinder body; and the sealing cover is provided with a vent opening; the front end of the cylinder body is provided with an oil filling opening; the oil filling opening is connected to the oil compensation chamber; an opening of the oil filling opening is provided with a sealing bolt;The sealing bolt is configured to install the sealing cover on the cylinder body and seal the oil filler opening; a rear end of the cylinder body and the sealing cover are fixed by a fastening screw; the cylinder body is symmetrically provided with two oil outlet openings; the two oil outlet openings are connected to the oil cylinder; one outlet of the oil outlet opening is sealed by a sealing element; and the oil cylinder and the oil equalization chamber are connected to each other via an oil equalization opening and a lubricating oil opening. [10] A hydraulic two-wheel brake actuation device comprising a carrier, an actuating lever and the hydraulic brake device according to claim 1, wherein the actuating lever is rotatably connected to the carrier; the hydraulic brake device has a symmetrical structure and is provided within the carrier; a drive rod is provided on the carrier; a head end of the drive rod is in contact with the actuating lever; a rear end of the drive rod is in contact with the hydraulic brake device; and the drive rod is configured to receive a drive force from the actuating lever. [11] The hydraulic brake actuation device according to claim 10, wherein the drive rod is rotatably provided on the support; the head end and the rear end of the drive rod are each provided with a roller element; the roller element at the head end is in contact with the actuating lever; and the roller element at the rear end is in contact with the hydraulic brake device. [12] The hydraulic brake actuation device according to claim 11, wherein the rolling element is a rolling bearing. [13] The hydraulic brake actuation device according to claim 10, wherein a head of the actuating lever is provided with a gear shifting device. [14] The hydraulic brake actuation device according to claim 11, wherein the actuating lever comprises a base and a lever body; the base is rotatably provided on the support; the lever body is rotatably provided on the base; and the rolling element at the head end of the drive rod is in contact with the base. [15] The hydraulic brake actuation device according to claim 14, wherein the base is provided with an extended drive section and the extended drive section is in contact with the rolling element at the head end of the drive rod. [16] The hydraulic brake actuation device according to claim 10, wherein the carrier is provided with an installation cavity and the hydraulic brake device is fastened in the installation cavity by a positioning shaft. [17] The hydraulic brake actuation device according to claim 10, wherein the rear end of the drive rod is in contact with the pushrod piston. [18] A two-wheeler comprising the hydraulic braking device according to any one of claims 1 to 9. [19] A two-wheeler comprising the hydraulic two-wheeler brake actuation device according to any one of claims 10 to 17.

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