A hydraulic braking system

Abstract

This utility model provides a hydraulic braking system, including a first brake lever assembly, a second brake lever assembly, and a brake caliper assembly. The brake caliper assembly can be driven by either or both of the first and second brake lever assemblies to perform braking actions. The hydraulic braking system includes a main hydraulic device, which includes: a cylinder having a hydraulic chamber; and a piston movably disposed within the cylinder, which divides the hydraulic chamber into a first inlet chamber, a second inlet chamber, and an outlet chamber. The first inlet chamber is in fluid communication with the first brake lever assembly, the second inlet chamber is in fluid communication with the second brake lever assembly, and the outlet chamber is in fluid communication with the brake caliper assembly. The first and second inlet chambers are not interconnected, and the oil supplied to them by the first and second brake lever assemblies respectively applies a superimposed thrust to the piston moving in the same direction, thereby enhancing the braking force of the hydraulic braking system.

Description

Technical Field

[0001] This utility model relates to the field of vehicle braking technology, and in particular to a hydraulic braking system. Background Technology

[0002] The braking system is a core component of bicycles, motorcycles, and other motorized vehicles, ensuring riding safety. Hydraulic braking is a commonly used braking method in motorized vehicles. Traditional bicycle hydraulic braking systems typically employ independent front and rear wheel braking structures. For example, the left brake lever controls the rear wheel's hydraulic braking, and the right brake lever controls the front wheel's. Users can brake only the rear wheel by holding only the left brake lever, only the front wheel by holding only the right brake lever, or both wheels simultaneously by holding both levers. However, this independent braking method often proves insufficient in emergency braking situations such as downhill slopes or slippery surfaces. The braking force applied to only the front or rear wheel is often inadequate, leading to prolonged braking distances and the risk of a single wheel locking up, causing the bicycle to tip forward or overturn. In sudden situations, even simultaneous operation of both brake levers cannot achieve rapid synchronization of braking between the front and rear wheels, affecting braking balance.

[0003] One improved solution in the industry is to link the front and rear wheels together. This involves connecting the hydraulic lines of the left and right brake levers to the same valve, from which two lines are led out to the front and rear brakes respectively. This way, holding either brake lever will brake both wheels simultaneously. However, with this linked control method, when both brake levers are held simultaneously, the connected hydraulic lines cause their operation to interfere with each other, making it difficult to achieve an effective superposition of braking effects.

[0004] Therefore, it is necessary to propose a new technical solution to overcome the above-mentioned shortcomings. Utility Model Content

[0005] This invention provides a hydraulic braking system that can effectively combine the braking effects of two brakes.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a hydraulic braking system for braking a bicycle, comprising a first brake lever assembly, a second brake lever assembly, and a brake caliper assembly, wherein the brake caliper assembly is fluidly connected to the first brake lever assembly and the second brake lever assembly, so as to be driven by either or both of the first brake lever assembly and the second brake lever assembly to perform a braking action; the hydraulic braking system includes a main hydraulic device fluidly connected to the first brake lever assembly and the second brake lever assembly, the main hydraulic device comprising:

[0007] The cylinder block has a hydraulic chamber;

[0008] A piston is movably disposed within the cylinder body, the piston dividing the hydraulic chamber into a first inlet chamber, a second inlet chamber, and an outlet chamber. The first inlet chamber is in fluid communication with one of the first brake lever assembly and the second brake lever assembly, the second inlet chamber is in fluid communication with the other of the first brake lever assembly and the second brake lever assembly, and the outlet chamber is in fluid communication with the brake caliper assembly.

[0009] The first oil inlet chamber and the second oil inlet chamber are not connected to each other, and the oil supply from the first brake lever assembly and the second brake lever assembly respectively applies a superimposed thrust to the piston to move in the same direction, thereby enhancing the braking force of the hydraulic braking system.

[0010] Optionally, the piston includes a first seal and a second seal arranged at intervals in its direction of movement, the first seal and the second seal separating the hydraulic chamber into a first inlet chamber, a second inlet chamber and an outlet chamber.

[0011] Optionally, the cylinder has a boss located between the first seal and the second seal in the direction of movement, wherein the range of movement of the piston is set such that neither the first seal nor the second seal extends beyond the boss.

[0012] Optionally, one of the first oil inlet chamber and the second oil inlet chamber is formed between the boss and the first seal, and the other of the first oil inlet chamber and the second oil inlet chamber is formed between the first seal and one end wall of the hydraulic chamber.

[0013] Optionally, the hydraulic chamber includes a large-diameter section and a small-diameter section connected in a stepped hole shape, the first seal being configured to move within the small-diameter section, and the second seal being configured to move within the large-diameter section.

[0014] Optionally, the hydraulic braking system includes a pressure regulating device connected to the oil outlet chamber. The pressure regulating device has an initial state and a termination state. The pressure regulating device is configured to be driven by the hydraulic oil in the oil outlet chamber to move from the initial state to the termination state, so as to limit the pressure of the hydraulic oil supplied by the oil outlet chamber to the brake caliper assembly and prevent lock-up.

[0015] Optionally, the voltage regulating device is configured as follows:

[0016] When the pressure of the hydraulic oil in the oil outlet chamber does not reach the preset threshold, it remains in the initial state; and,

[0017] When the pressure of the hydraulic oil in the oil outlet chamber reaches a preset threshold, it moves from the initial state to the termination state, and when the pressure of the hydraulic oil in the oil outlet chamber is not less than the preset threshold, it remains in the termination state.

[0018] Optionally, the pressure regulating device includes a pressure regulating chamber and a pressure regulating piston movably disposed in the pressure regulating chamber, wherein the hydraulic oil in the oil outlet chamber can act on the pressure regulating piston to drive the pressure regulating piston to move.

[0019] Optionally, the pressure regulating chamber is filled with fluid, and the pressure regulating device includes a flow limiting valve communicating with the pressure regulating chamber.

[0020] Optionally, the fluid filling the pressure regulating chamber is gas, and the flow limiting valve is a flow regulating valve that can adjust the gas flow rate.

[0021] Optionally, a pressure regulating spring is provided in the pressure regulating chamber, and the pressure regulating spring elastically abuts against the pressure regulating piston to provide an elastic force for the pressure regulating piston to return to its initial state.

[0022] Optionally, the brake caliper assembly includes a front brake caliper assembly for braking the front wheels and a rear brake caliper assembly for braking the rear wheels, wherein the front brake caliper assembly and the rear brake caliper assembly are respectively in fluid communication with the oil outlet chamber.

[0023] The hydraulic braking system provided by this utility model has a main hydraulic device. The hydraulic chamber of the main hydraulic device is divided into a first oil inlet chamber and a second oil inlet chamber by a piston. The oil supply from the first brake lever assembly and the second brake lever assembly, respectively, is applied to the piston to generate a superimposed thrust that moves the piston in the same direction. In this way, the oil supply from the two brake lever assemblies can be effectively superimposed on the piston of the main hydraulic device, avoiding the problem that when the two brake lever assemblies brake at the same time, the braking forces affect and restrict each other and cannot be effectively superimposed. This increases the braking performance and significantly improves the braking performance of bicycles and other cycling vehicles. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0025] Figure 1 This is a connection diagram of an embodiment of the hydraulic braking system of this utility model.

[0026] Figure 2 This is a three-dimensional assembly diagram of an embodiment of the hydraulic braking system of this utility model.

[0027] Figure 3This is a cross-sectional view of the main hydraulic device in one embodiment of the hydraulic braking system of this utility model.

[0028] Figure 4 This is a curve showing the brake grip force versus the pressure in the oil outlet chamber in one embodiment of the hydraulic braking system of this utility model.

[0029] Explanation of reference numerals in the attached drawings: 100, Hydraulic braking system; 10, First brake lever assembly; 11, First brake lever; 12, First hydraulic cylinder; 121, First cylinder body; 122, First piston; 20, Second brake lever assembly; 21, Second brake lever; 22, Second hydraulic cylinder; 221, Second cylinder body; 222, Second piston; 3, Main hydraulic device; 301, First oil inlet chamber; 302, Second oil inlet chamber; 303, Oil outlet chamber; 304, Pressure regulating chamber; 31, Cylinder body; 311, First inlet. 312. Second inlet; 313. Oil filler port; 314. First outlet; 315. Second outlet; 316. Boss; 32. Piston; 321. First seal; 322. Second seal; 323. Third seal; 33. Spring; 34. Pressure regulating cylinder; 35. Pressure regulating piston; 36. Pressure regulating spring; 37. Flow limiting valve; 4. Oil reservoir; 51. First oil supply line; 52. Second oil supply line; 53. Brake branch line; 61. Front brake caliper assembly; 62. Rear brake caliper assembly. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] Unless otherwise defined, the technical or scientific terms used in this patent document shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model patent specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or its equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0035] Please see Figures 1 to 4 As shown, this utility model discloses a hydraulic braking system 100 for braking a bicycle, comprising a first brake lever assembly 10, a second brake lever assembly 20, and a brake caliper assembly. The brake caliper assembly is fluidly connected to the first brake lever assembly 10 and the second brake lever assembly 20, and is driven by either or both of the first brake lever assembly 10 and the second brake lever assembly 20 to perform braking actions. The hydraulic braking system 100 further includes a main hydraulic device 3 fluidly connected to the first brake lever assembly 10 and the second brake lever assembly 20, through which the first brake lever assembly 10 and the second brake lever assembly 20 drive the brake caliper assembly.

[0036] The main hydraulic device 3 includes a cylinder 31 with a hydraulic chamber and a piston 32 movably disposed within the cylinder 31. The piston 32 divides the hydraulic chamber into a first inlet chamber 301, a second inlet chamber 302, and an outlet chamber 303. The first inlet chamber 301 is in fluid communication with one of the first brake lever assembly 10 and the second brake lever assembly 20, the second inlet chamber 302 is in fluid communication with the other of the first brake lever assembly 10 and the second brake lever assembly 20, and the outlet chamber 303 is in fluid communication with the brake caliper assembly.

[0037] The first oil inlet chamber 301 and the second oil inlet chamber 302 are not connected to each other, and the oil supply from the first brake lever assembly 10 and the second brake lever assembly 20 respectively is applied to the piston 32 to exert a superimposed thrust in the same direction, so as to enhance the braking force of the hydraulic braking system 100.

[0038] The hydraulic braking system 100 provided by this utility model has a main hydraulic device 3. The hydraulic chamber of the main hydraulic device 3 is divided into a first oil inlet chamber 301 and a second oil inlet chamber 302 that are not connected to each other by a piston 32. The first oil inlet chamber 301 and the second oil inlet chamber 302 respectively receive oil from the first brake lever assembly 10 and the second brake lever assembly 20, which are applied to the piston 32 to move in the same direction, thus effectively superimposing the oil supply of the two brake lever assemblies onto the piston 32 of the main hydraulic device 3. This avoids the problem that when the two brake lever assemblies brake at the same time, the braking forces affect and restrict each other and cannot be effectively superimposed, thereby increasing the braking performance and significantly improving the braking performance of bicycles and other cycling vehicles.

[0039] like Figure 1 and Figure 2 As shown, the hydraulic braking system 100 of this embodiment includes a first brake lever assembly 10, a second brake lever assembly 20, a main hydraulic device 3, and a brake caliper assembly. The first brake lever assembly 10 includes a first brake lever 11 and a first hydraulic cylinder 12; the second brake lever assembly 20 includes a second brake lever 21 and a second hydraulic cylinder 22; and the brake caliper assembly includes a front brake caliper assembly 61 and a rear brake caliper assembly 62. The main hydraulic device 3 is fluidly connected to the first hydraulic cylinder 12 and the second hydraulic cylinder 22 via a first oil supply line 51 and a second oil supply line 52, respectively, and is connected to the front brake caliper assembly 61 and the rear brake caliper assembly 62 via a brake branch line 53. This allows the front brake caliper assembly 61 and the rear brake caliper assembly 62 to be driven by either or both of the first brake lever assembly 10 and the second brake lever assembly 20, achieving coordinated braking of the front and rear wheels.

[0040] In this embodiment, the hydraulic braking system 100 is used on a bicycle. The first brake lever 11 and the first hydraulic cylinder 12 are mounted on the left handlebar of the bicycle stem, with the first brake lever 11 mounted beside the first hydraulic cylinder 12. The first hydraulic cylinder 12 includes a first cylinder body 121 and a first piston 122 disposed within the first cylinder body 121. The first piston 122 is movably disposed within the first cylinder body 121. The first piston 122 has a piston rod that contacts the first brake lever 11. When the first brake lever 11 is gripped, the first brake lever 11 pushes the first piston 122 to slide within the first cylinder body 121, thereby driving the hydraulic oil within the first cylinder body 121 to flow towards the main hydraulic device 3.

[0041] Similarly, the second brake lever 21 and the second hydraulic cylinder 22 are mounted on the right handlebar of the bicycle stem, with the second brake lever 21 mounted beside the second hydraulic cylinder 22. The second hydraulic cylinder 22 includes a second cylinder body 221 and a second piston 222 disposed within the second cylinder body 221. The second piston 222 is movably disposed within the second cylinder body 221. The second piston 222 has a piston rod that contacts the second brake lever 21. When the second brake lever 21 is gripped, the second brake lever 21 pushes the second piston 222 to slide within the second cylinder body 221, thereby pushing the hydraulic oil within the second cylinder body 221 to flow to the main hydraulic device 3. It should be noted that the first brake lever assembly 10 and the second brake lever assembly 20 are not limited to a left-right arrangement, but can also be arranged up-down or in other arrangements, and are not limited to being operated by hand, but can also be operated by foot or other parts of the body.

[0042] Please see Figure 3As shown, the main hydraulic device 3 includes a cylinder 31 and a piston 32. A hydraulic chamber is formed within the cylinder 31, which is divided into a first inlet chamber 301, a second inlet chamber 302, and an outlet chamber 303 by the piston 32. In this embodiment, the piston 32 includes a first seal 321 and a second seal 322 arranged at intervals along its direction of movement. The first seal 321 and the second seal 322 divide the hydraulic chamber into the first inlet chamber 301, the second inlet chamber 302, and the outlet chamber 303. Specifically, the piston 32 is sequentially equipped with the first seal 321 and the second seal 322 along its direction of movement during braking. The first seal 321 and the second seal 322 divide the hydraulic chamber into three sections, with the first inlet chamber 301, the second inlet chamber 302, and the outlet chamber 303 located sequentially within these three sections. The first oil inlet chamber 301 is fluidly connected to the first hydraulic cylinder 12 through the first inlet 311, the second oil inlet chamber 302 is fluidly connected to the second hydraulic cylinder 22 through the second inlet 312, and the oil outlet chamber 303 is fluidly connected to the front brake caliper assembly 61 and the rear brake caliper assembly 62 through the first outlet 314 and the second outlet 315, respectively. The hydraulic braking system also includes an oil reservoir 4, and the main hydraulic device 3 has an oil filling port 313, which can be connected to the oil reservoir 4 to add hydraulic oil to the hydraulic braking system when the hydraulic oil is insufficient or needs to be replaced.

[0043] like Figure 3As shown, the hydraulic chamber adopts a stepped channel structure, including a large-diameter section and a small-diameter section. The piston 32 is a stepped shaft structure corresponding to and matched with the hydraulic chamber. The first seal 321 is disposed within the small-diameter section and moves, the second seal 322 is disposed within the large-diameter section and moves, and a third seal 323 is also provided on the outer periphery of the piston 32 to ensure the chamber's sealing performance. In this embodiment, the first seal 321, the second seal 322, and the third seal 323 are arranged sequentially in the moving direction of the piston 32, and there is no hydraulic oil between the third seal 323 and the second seal 322. In this embodiment, the cylinder body 31 has a boss 316 located between the first seal 321 and the second seal 322 in the moving direction, and the piston 32 has a shoulder corresponding to and matched with the boss 316. Specifically, a boss 316 is formed on the inner wall of the cylinder 31 between the first seal 321 and the second seal 322. The movement range of the piston 32 is limited so that the first seal 321 and the second seal 322 never cross the boss 316, thereby ensuring that the first oil inlet chamber 301 is formed between the first seal 321 and the end wall of the hydraulic chamber, and the second oil inlet chamber 302 is formed between the boss 316 and the first seal 321, so that the two oil inlet chambers remain completely isolated. In this embodiment, the boss 316 on the cylinder 31 and the shoulder on the piston 32 are provided such that the hydraulic oil in the second oil inlet chamber 302 forms a force between the boss 316 and the shoulder, thereby pushing the piston 32 in a direction perpendicular to the shoulder. The thrust of the hydraulic oil in the first oil inlet chamber 301 acts on the end face of the piston 32, and its direction is the same as the thrust formed by the hydraulic oil in the second oil inlet chamber 302, achieving a thrust superposition effect. It is understandable that the volumes of the first oil inlet chamber 301, the second oil inlet chamber 302, and the oil outlet chamber 303 described in this article will change as the piston 32 moves, rather than being fixed chambers. That is, when oil is introduced, the volumes of the first oil inlet chamber 301 and the second oil inlet chamber 302 will increase, while the volume of the oil outlet chamber 303 will decrease.

[0044] When the user holds one of the first brake lever 11 and the second brake lever 21, or holds both brake levers simultaneously, the corresponding first hydraulic cylinder 12 or second hydraulic cylinder 22 injects hydraulic oil into the first oil inlet chamber 301 or the second oil inlet chamber 302 through the oil supply line. Since the two oil inlet chambers are not interconnected, the internal hydraulic pressure acts on the end face of the piston 32 or the shoulder of the piston 32, respectively, forming a force in the same direction (…). Figure 3 The combined downward thrust pushes the piston 32 to compress the hydraulic oil in the outlet chamber 303. The hydraulic oil in the outlet chamber 303 is distributed to the front brake caliper assembly 61 and the rear brake caliper assembly 62 via the brake branch line 53, driving the brake calipers to perform braking actions.

[0045] For further information, please refer to [link / reference]. Figure 3As shown, to prevent wheel lock-up, the hydraulic braking system 100 further includes a pressure regulating device connected to the oil outlet chamber 303. The pressure regulating device has an initial state and a final state. It is configured to be driven by the hydraulic oil in the oil outlet chamber 303 from the initial state to the final state, thereby limiting the pressure of the hydraulic oil supplied from the oil outlet chamber 303 to the brake caliper assembly and preventing lock-up. Specifically, the main hydraulic device 3 is equipped with the pressure regulating device, which includes a pressure regulating cylinder 34, a pressure regulating piston 35, and a pressure regulating spring 36. A pressure regulating chamber 304 is formed within the pressure regulating cylinder 34. The pressure regulating piston 35 is movably disposed within the pressure regulating chamber 304 and elastically abuts against it by the pressure regulating spring 36. The pressure regulating spring 36 is located within the pressure regulating chamber 304 and elastically abuts against the pressure regulating piston 35 to provide an elastic force for the pressure regulating piston 35 to return to its initial state. The pressure regulating chamber 304 is filled with a fluid medium, which can be discharged in a restricted manner through the flow limiting valve 37 to regulate the pressure of the oil outlet chamber 303. In this embodiment, the fluid filled in the pressure regulating chamber 304 can be a gas, such as air. The pressure regulating device includes a flow limiting valve 37 connected to the pressure regulating chamber 304. The flow limiting valve 37 is a flow regulating valve that can adjust the gas flow rate, such as a gas speed regulating valve.

[0046] The pressure regulating device is configured to: maintain the initial state when the pressure of the hydraulic oil in the oil outlet chamber 303 does not reach a preset threshold; and move from the initial state to the termination state when the pressure of the hydraulic oil in the oil outlet chamber 303 reaches the preset threshold, and maintain the termination state when the pressure of the hydraulic oil in the oil outlet chamber 303 is not less than the preset threshold. That is, when the user operates the brake lever, and the pressure of the hydraulic oil in the oil outlet chamber 303 begins to increase but does not reach the preset threshold, the pressure regulating piston 35 maintains its initial position under the action of the pressure regulating spring 36. During this process, all the hydraulic oil squeezed out from the oil outlet chamber 303 flows to the brake caliper assembly, and the gripping force of the brake lever has a positive linear relationship with the pressure in the oil outlet chamber 303. Figure 4 As shown in the first sloping segment of the curve; when the pressure reaches the threshold, hydraulic oil acts on the pressure regulating piston 35 through the oil inlet 313, pushing it to overcome the spring force and move towards the termination state, limiting the hydraulic output of the oil outlet chamber 303. During this process, hydraulic oil from the oil outlet chamber 303 replenishes the space vacated by the downward movement of the pressure regulating piston 35, without continuing to be applied to the brake caliper assembly, achieving a relatively stable holding pressure and preventing over-braking of the brake caliper. Figure 4 The middle horizontal line segment of the curve is shown; when the pressure regulating piston 35 moves to contact the pressure regulating cylinder 34 and can no longer move, this is the terminated state. After this, if the brake lever is continued to be gripped, the hydraulic oil in the oil outlet chamber 303 is squeezed out and flows to the brake caliper assembly. The gripping force of the brake lever and the pressure in the oil outlet chamber 303 are again positively linearly related, as shown in the figure. Figure 4 The second oblique segment of the middle curve is shown.

[0047] When in use, when the user simultaneously grips the first brake lever 11 and the second brake lever 21, the combined oil supply and pressure of the first hydraulic cylinder 12 and the second hydraulic cylinder 22 act together on the piston 32 of the main hydraulic device 3, enhancing the braking pressure of the hydraulic braking system and enabling rapid braking. Furthermore, when the braking force reaches the set threshold, the pressure regulating piston 35 moves downward, compressing the air in the pressure regulating chamber 304 and discharging it through the gas speed regulating valve. Adjusting the outlet size of the gas speed regulating valve controls the air discharge speed, thereby regulating the movement speed of the pressure regulating piston 35. This changes the time it takes for the pressure regulating piston 35 to move from the start to the top of the pressure regulating chamber 304, creating a delay time. During this time, the pressure in the oil outlet chamber 303 of the main hydraulic device 3 remains stable due to the movement of the pressure regulating piston 35. This prevents the pressure in the oil outlet chamber 303 from rising rapidly due to excessive pressure applied by the user to the brake lever, which could lead to excessive braking force on the front brake caliper assembly 61 and the rear brake caliper assembly 62, causing wheel lock-up and dangerous situations such as wheel spin or skidding. Once the pressure regulating piston 35 has reached its bottom, the pressure in the oil outlet chamber 303 of the main hydraulic device 3 returns to a linear relationship with the user's grip on the brake lever. The braking force automatically switches between "soft" and "hard" during each braking process, avoiding excessive grip force during emergency braking that could lead to danger, thus improving the smoothness and safety of braking.

[0048] As described above in the specific embodiment, this embodiment achieves linear superposition of oil supply from both brake levers through the structural design of the main hydraulic device 3. When only one brake lever is operated, a unidirectional thrust is generated in the corresponding oil inlet chamber; when both brake levers are operated simultaneously, the hydraulic pressure from both oil inlet chambers works together, significantly increasing the pressure in the oil outlet chamber 303. Furthermore, the pressure regulating device automatically intervenes when the pressure is too high, ensuring the safety and controllability of the braking process. The front brake caliper assembly 61 and the rear brake caliper assembly 62 are connected to the oil outlet chamber 303 via independent brake branch lines 53, allowing them to synchronously receive the superimposed hydraulic pressure and achieve rapid response and balanced distribution of braking between the front and rear wheels.

[0049] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A hydraulic braking system for braking a bicycle, comprising a first brake lever assembly, a second brake lever assembly, and a brake caliper assembly driven by either or both of the first and second brake lever assemblies to perform braking actions; characterized in that, The hydraulic braking system also includes a main hydraulic device, which comprises: The cylinder block has a hydraulic chamber; A piston is movably disposed within the cylinder body, and the piston divides the hydraulic chamber into a first inlet chamber, a second inlet chamber, and an outlet chamber. The first inlet chamber is in fluid communication with the first brake lever assembly, the second inlet chamber is in fluid communication with the second brake lever assembly, and the outlet chamber is in fluid communication with the brake caliper assembly. The first oil inlet chamber and the second oil inlet chamber are not connected to each other, and the oil supply from the first brake lever assembly and the second brake lever assembly respectively applies a superimposed thrust to the piston to move in the same direction, thereby enhancing the braking force of the hydraulic braking system.

2. The hydraulic braking system as described in claim 1, characterized in that, The piston includes a first seal and a second seal arranged at intervals in its direction of movement, the first seal and the second seal dividing the hydraulic chamber into a first inlet chamber, a second inlet chamber and an outlet chamber.

3. The hydraulic braking system as described in claim 2, characterized in that, The cylinder has a boss located between the first seal and the second seal in the direction of movement, wherein the range of movement of the piston is set such that neither the first seal nor the second seal crosses the boss.

4. The hydraulic braking system as described in claim 3, characterized in that, One of the first oil inlet chamber and the second oil inlet chamber is formed between the boss and the first seal, and the other of the first oil inlet chamber and the second oil inlet chamber is formed between the first seal and one end wall of the hydraulic chamber.

5. The hydraulic braking system as described in any one of claims 2 to 4, characterized in that, The hydraulic chamber includes a large-diameter section and a small-diameter section connected in a stepped hole shape, the first seal being configured to move within the small-diameter section, and the second seal being configured to move within the large-diameter section.

6. The hydraulic braking system as described in any one of claims 1 to 4, characterized in that, The hydraulic braking system includes a pressure regulating device connected to the oil outlet chamber. The pressure regulating device has an initial state and a termination state. The pressure regulating device is configured to be driven by the hydraulic oil in the oil outlet chamber to move from the initial state to the termination state, so as to limit the pressure of the hydraulic oil supplied by the oil outlet chamber to the brake caliper assembly and prevent lock-up.

7. The hydraulic braking system as described in claim 6, characterized in that, The voltage regulating device is configured as follows: When the pressure of the hydraulic oil in the oil outlet chamber does not reach the preset threshold, it remains in the initial state. as well as, When the pressure of the hydraulic oil in the oil outlet chamber reaches a preset threshold, it moves from the initial state to the termination state, and when the pressure of the hydraulic oil in the oil outlet chamber is not less than the preset threshold, it remains in the termination state.

8. The hydraulic braking system as described in claim 6, characterized in that, The pressure regulating device includes a pressure regulating chamber and a pressure regulating piston movably disposed in the pressure regulating chamber. The hydraulic oil in the oil outlet chamber can act on the pressure regulating piston to drive the pressure regulating piston to move.

9. The hydraulic braking system as described in claim 8, characterized in that, The pressure regulating chamber is filled with fluid, and the pressure regulating device includes a flow limiting valve connected to the pressure regulating chamber.

10. The hydraulic braking system as described in claim 9, characterized in that, The fluid filling the pressure regulating chamber is gas, and the flow limiting valve is a flow regulating valve that can adjust the gas flow rate.

11. The hydraulic braking system as described in claim 8, characterized in that, A pressure regulating spring is provided inside the pressure regulating chamber. The pressure regulating spring elastically abuts against the pressure regulating piston to provide elastic force for the pressure regulating piston to return to its initial state.

12. The hydraulic braking system as described in any one of claims 1 to 4, characterized in that, The brake caliper assembly includes a front brake caliper assembly for braking the front wheels and a rear brake caliper assembly for braking the rear wheels, wherein the front brake caliper assembly and the rear brake caliper assembly are respectively in fluid communication with the oil outlet chamber.

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