Oil pressure brake handle and bicycle

Abstract

The utility model discloses a kind of oil pressure brake handle and bicycle, oil pressure brake handle includes base, piston cylinder and fixed structure, piston cylinder is the component independent of base, and is installed in base by fixed structure;Base and piston cylinder are made of different materials.The utility model is by the combination design of base, piston cylinder and fixed structure, effectively solve the technical problem existing in background art.Oil pressure brake handle in background art needs to adopt metal material to process complex piston cylinder structure as a whole for base, leading to high cost and manufacturing difficulty.And the scheme separates function, so that base can be made of non-metallic material easier to process, significantly reduce material cost and processing difficulty.Independent piston cylinder can be specially manufactured using metal material to meet the requirements of wear resistance, corrosion resistance and high precision, and reliably combined with base through fixed structure.In this way, the performance of key components is guaranteed, and the overall cost is reduced through structural optimization.

Description

Technical Field

[0001] This utility model belongs to the field of bicycle technology, specifically relating to a hydraulic brake lever and a bicycle. Background Technology

[0002] Currently, mountain bikes widely use hydraulic braking systems, with the core component, the hydraulic brake lever, typically comprising a base, operating lever, piston, and hydraulic circuit structure. In existing technology, the base of the hydraulic brake lever must be manufactured entirely of metal, as the piston cylinder must be directly machined internally to ensure the wear resistance, corrosion resistance, and high precision of the cylinder's inner wall, guaranteeing smooth reciprocating motion of the piston within the cylinder. However, the complex shape and large size of the piston cylinder, coupled with the overall metal structure of the base, result in high material costs, complex machining, and long manufacturing cycles, leading to a high overall manufacturing cost for hydraulic brake levers. Furthermore, the base is usually fixed to the handlebars via a clamp, and this integrated design of structure and materials limits the possibility of further cost reduction. Utility Model Content

[0003] In view of this, the present invention provides a hydraulic brake lever and bicycle that can effectively reduce material and manufacturing costs while maintaining braking performance.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a hydraulic brake lever, the hydraulic brake lever comprising a base, a piston cylinder, and a fixing structure, wherein the piston cylinder is a component independent of the base and is installed within the base via the fixing structure; wherein the base and the piston cylinder are made of different materials.

[0005] In some embodiments, the piston cylinder is made of a metallic material, and the substrate is made of a non-metallic material.

[0006] In some embodiments, the substrate is made of plastic and has an integrally formed oil storage cavity inside.

[0007] In some embodiments, an elastic oil bladder is provided inside the oil storage cavity, and a vent is provided on the substrate. The vent communicates with the side of the elastic oil bladder facing away from the oil storage cavity to allow access to the atmosphere.

[0008] In some embodiments, the piston cylinder has a radially extending lug at its end, and the fixing structure includes at least one pin that passes through a corresponding mounting hole on the base and engages with the lug to fix the piston cylinder in the base.

[0009] In some embodiments, there are two ears arranged opposite to each other, and the fixing structure includes two pins that are respectively engaged with the two ears.

[0010] In some embodiments, the lower part of the oil storage chamber is provided with an enlarged area with a diameter greater than the outer diameter of the piston cylinder, and the side wall of the piston cylinder is provided with a first oil hole and a second oil hole. The piston chamber of the piston cylinder communicates with the oil storage chamber through the enlarged area and the first and second oil holes.

[0011] In some embodiments, at least one sealing ring is provided at the mounting interface between the piston cylinder and the base.

[0012] In some embodiments, a reciprocating piston is provided inside the piston cylinder, and two oil seals are provided between the piston and the inner wall of the piston cylinder to seal the piston cavity.

[0013] According to another aspect of this application, an embodiment of the present invention provides a bicycle that includes the hydraulic brake lever described above.

[0014] Compared with the prior art, the hydraulic brake lever of this utility model has at least the following beneficial effects: The hydraulic brake lever provided by this utility model includes a base, a piston cylinder, and a fixing structure. The piston cylinder is a component independent of the base and is installed in the base through the fixing structure. The base and the piston cylinder are made of different materials.

[0015] This embodiment effectively solves the technical problems existing in the prior art by adopting a combined design of the base, piston cylinder, and fixing structure. In the prior art, hydraulic brake levers require the entire base to be made of metal to process the complex piston cylinder structure, resulting in high costs and manufacturing difficulties. This solution separates the functions, allowing the base to be manufactured using easier-to-process non-metallic materials, significantly reducing material costs and processing difficulty. The independent piston cylinder can be specially manufactured using metal materials to meet the requirements of wear resistance, corrosion resistance, and high precision, and is reliably integrated with the base through the fixing structure. This ensures the performance of key components while reducing overall costs through structural optimization.

[0016] On the other hand, the bicycle provided by this utility model is designed based on the above-mentioned hydraulic brake lever, and its beneficial effects are the same as those of the above-mentioned hydraulic brake lever, which will not be repeated here.

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the hydraulic brake lever provided in an embodiment of this utility model; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a cross-sectional view of the hydraulic brake lever from another angle, provided in an embodiment of this utility model. Figure 4 This is a longitudinal sectional view of the hydraulic brake lever provided in an embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of the hydraulic brake lever provided in an embodiment of this utility model.

[0020] in: 1. Matrix; 11. Oil reservoir; 12. Elastic oil bladder; 13. Vent hole; 111. Enlarged area; 2. Piston cylinder; 21. Piston chamber; 22. Ear; 23. First oil hole; 24. Second oil hole; 3. Fixing structure; 4. Sealing ring; 5. Piston; 6. Oil seal; 7. Brake lever. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0022] In the description of this utility model, it should be clarified that the terms "first," "second," etc., in the specification, claims, and drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "back," "left," "right," "up," "down," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this utility model.

[0023] 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example 1 This embodiment provides a hydraulic brake lever, such as Figures 1-5 As shown, the hydraulic brake lever includes a base 1, a piston cylinder 2, and a fixing structure 3. The piston cylinder 2 is a component independent of the base 1 and is installed in the base 1 through the fixing structure 3. The base 1 and the piston cylinder 2 are made of different materials.

[0025] The base 1 serves as the main supporting structure, and its interior has a hole for accommodating the piston cylinder 2. The piston cylinder 2 is an independent component that is installed and fixed within this specific hole in the base 1. The fixing structure 3 is crucial for achieving this installation and fixation; it connects the base 1 and the piston cylinder 2, ensuring that the piston cylinder 2 remains in the correct position within the base 1, thus forming a complete assembly.

[0026] The base 1, piston cylinder 2, and fixing structure 3 each play an indispensable role. The base 1, as the basic frame of the hydraulic brake lever, primarily provides structural support and a mounting platform; it is typically fixed to the bicycle handlebars and houses components such as the operating lever. The piston cylinder 2, as the core functional unit, provides a high-precision cylinder space, allowing the piston to reciprocate within it—crucial for generating hydraulic force to achieve braking. The fixing structure 3 provides mechanical connection and fastening, ensuring that the piston cylinder 2 is securely and precisely installed within the base 1, preventing relative displacement or loosening during long-term use and maintaining the integrity of the entire system.

[0027] The base 1, piston cylinder 2, and fixed structure 3 work together to achieve the braking function. When the user operates the brake lever 7, the force is transmitted through the base 1, driving the piston to move inside the piston cylinder 2. The piston's movement pushes the brake fluid to generate hydraulic pressure, which is transmitted to the caliper at the wheel through the oil circuit. Throughout the process, the fixed structure 3 ensures the stability of the piston cylinder 2 relative to the base 1, making the piston's movement trajectory precise and reliably sealed, thereby ensuring the effective transmission of braking force and the system's responsiveness. The base 1, as a stable carrier, bears the operating force and supports the entire actuation mechanism.

[0028] This embodiment effectively solves the technical problems existing in the background art by adopting a combined design of base 1, piston cylinder 2, and fixing structure 3. In the background art, hydraulic brake levers require the entire base to be made of metal to process the complex piston cylinder structure, resulting in high costs and manufacturing difficulties. This solution separates functions, allowing the base 1 to be manufactured using easier-to-process non-metallic materials, significantly reducing material costs and processing difficulty. The independent piston cylinder 2 can be specially manufactured using metal materials to meet the requirements of wear resistance, corrosion resistance, and high precision, and is reliably combined with the base 1 through the fixing structure 3. This ensures the performance of key components while reducing overall costs through structural optimization.

[0029] In a specific embodiment, the piston cylinder 2 is made of metal, and the substrate 1 is made of non-metallic material.

[0030] Piston cylinder 2 is made of metal, while the base 1 is made of non-metallic materials. More specifically, this division of materials is directly based on the different functions and requirements these two components must fulfill in the braking system. As the cavity for the reciprocating motion of the piston, piston cylinder 2 requires extremely high wear resistance, corrosion resistance, and the ability to maintain dimensional accuracy over long-term use; metallic materials perfectly meet these stringent physical and mechanical performance requirements. Meanwhile, the base 1, as the main support and mounting structure, focuses more on shaping the overall form, providing mounting points, and accommodating other components; therefore, it can be manufactured using non-metallic materials such as engineering plastics.

[0031] The most direct effect of this embodiment is a significant reduction in the overall material cost of the hydraulic brake lever. Higher-priced metal materials are used only in the critical functional component, the piston cylinder 2, where they are most needed, while the larger, more complex-shaped base 1 can be made from much cheaper non-metallic materials. Furthermore, this design greatly reduces the product's processing difficulty and manufacturing cost. For the non-metallic base 1, efficient and low-cost manufacturing processes such as injection molding can be used, allowing for one-time molding even with complex and irregular shapes, avoiding numerous complex metal machining steps. As for the piston cylinder 2, it can be treated as an independent, regularly shaped metal part and precision-machined separately, making it easier to ensure the high precision and smoothness of its inner wall, ultimately ensuring smooth piston movement and the sealing of the braking system.

[0032] In a specific embodiment, the substrate 1 is made of plastic and has an integrally formed oil storage cavity 11 inside.

[0033] The non-metallic material used in the substrate 1 is plastic, which directly utilizes the characteristic that plastic is easy to form into complex shapes through processes such as injection molding. More specifically, the core of this feature is that the oil storage cavity 11 is not a part that is processed later or installed additionally, but rather a cavity structure with a specific function and shape is directly formed inside the substrate 1 during the manufacturing process through a mold. That is, the oil storage cavity 11 and the substrate 1 itself are an inseparable whole.

[0034] The primary function of the reservoir 11 is to hold and store brake fluid, serving as a fluid reservoir within the hydraulic system. Furthermore, the reservoir 11 cooperates with and connects to the piston cylinder 2, forming a complete oil circulation system. When the brake lever 7 is operated, causing the piston to move within the piston cylinder 2, fluctuations in oil pressure and quantity occur throughout the sealed oil circuit. The reservoir 11 exists to adapt to and compensate for these changes, such as absorbing excess oil due to thermal expansion or wear, or replenishing oil when needed, thereby ensuring smooth and reliable transmission of braking force and maintaining stable braking performance. From a manufacturing and cost perspective, designing the reservoir 11 as a single integral part of the plastic substrate 1 completely eliminates the need for a separate oil storage component and its subsequent assembly steps. This not only simplifies the overall brake lever structure but, more importantly, significantly reduces the processing costs of components and the overall assembly cost, as only a single injection molding operation is required to simultaneously obtain the substrate 1 and its internal reservoir 11.

[0035] In a specific embodiment, an elastic oil bladder 12 is provided inside the oil storage cavity 11, and a vent 13 is provided on the base 1. The vent 13 communicates with the side of the elastic oil bladder 12 facing away from the oil storage cavity 11 to connect with the atmosphere.

[0036] The elastic bladder 12 is directly disposed within the internal cavity of the oil reservoir 11, which is integrally formed from the base 1. More specifically, this elastic bladder 12 is a flexible, sealed container, and its installation position separates the internal space of the oil reservoir 11. The vent 13 is a small channel directly machined into the base 1. One end of this channel opens to the outside atmosphere, while the other end is precisely connected to the side of the elastic bladder 12 opposite to the oil space of the oil reservoir 11, thus forming an air cavity on the other side of the elastic bladder 12 that is in communication with atmospheric pressure. The main function of the elastic bladder 12 is to act as a deformable isolation barrier, with one side containing brake fluid and the other side filled with air. Its core function is to use its own elastic deformation to absorb and compensate for the expansion or contraction of brake fluid volume caused by temperature changes or piston movement, thereby maintaining the stability of the pressure within the hydraulic system. The function of the vent 13 is to provide a permanent external channel for the aforementioned air cavity, ensuring that the pressure inside the air cavity always remains consistent with the external atmospheric pressure. Furthermore, this design allows air to enter and exit freely, but through the isolation of the elastic bladder 12, it completely prevents direct contact between brake fluid and air, while also preventing external dust and moisture from entering the system.

[0037] When brake fluid expands due to increased temperature, it compresses the elastic bladder 12. Because the vent 13 ensures constant air pressure on the other side, the elastic bladder 12 can be compressed and deformed, providing space for excess fluid. Conversely, when the fluid cools and contracts or decreases due to wear, atmospheric pressure acts on the elastic bladder 12 through the vent 13, causing it to expand and push fluid back to replenish the system. This ensures the brake lines are always full, preventing air from being drawn in and causing brake fatigue. This synergistic mechanism significantly improves the reliability and safety of the braking system, ensuring the immediacy and consistency of braking force transmission while completely preventing fluid oxidation and performance degradation, as the fluid is completely sealed and does not come into contact with air.

[0038] In a specific embodiment, the piston cylinder 2 has a radially extending ear 22 at its end, and the fixing structure 3 includes at least one pin. The pin passes through a corresponding mounting hole on the base 1 and is engaged with the ear 22 to fix the piston cylinder 2 inside the base 1.

[0039] A radially extending lug 22 is machined at the end of the piston cylinder 2, meaning that the lug 22 is a portion protruding outward from the cylindrical body of the piston cylinder 2. The fixing structure 3 is specifically embodied in at least one pin, which is designed to pass through a corresponding mounting hole pre-machined on the base 1 and ultimately engage with the lug 22 at the end of the piston cylinder 2. More specifically, during assembly, the piston cylinder 2 is first inserted into the hole of the base 1, aligning its lug 22 with the mounting hole position on the base 1. Then, the pin is inserted from one side of the base 1, passing through the mounting hole of the base 1 and ultimately engaging with the specific structure of the lug 22. This utilizes the rigid blocking effect of the pin to prevent the piston cylinder 2 from dislodging from the base 1, achieving a secure connection between the two.

[0040] In this embodiment, an independent metal piston cylinder 2 is securely mounted inside a non-metallic plastic substrate 1. This ensures that these two components, made of different materials and with different functions, maintain their correct relative position without loosening or separating when subjected to repeated actions and vibrations during braking. Furthermore, this pin-and-ear connection method simplifies the installation process, eliminating the need for complex tools or threaded fastenings, greatly simplifying the assembly process, improving production efficiency, and facilitating later maintenance and replacement. This design fully leverages the advantages of both the metal piston cylinder 2 and the plastic substrate 1. Through a sophisticated mechanical interconnection, it ensures the precision and reliability of key moving parts while achieving lightweight and low-cost manufacturing of the overall structure, making it a key measure to address high-cost issues.

[0041] In a specific embodiment, there are two ears 22 arranged opposite to each other, and the fixing structure 3 includes two pins that are respectively engaged with the two ears 22.

[0042] The piston cylinder 2 has two lugs 22 at its end, and these two lugs 22 are arranged opposite each other, which means that their positions are symmetrically distributed about the axis of the piston cylinder 2. Furthermore, the fixing structure 3 also includes two pins, which correspond one-to-one with the two lugs 22. Each pin passes through a corresponding mounting hole on the base 1 and engages with a corresponding lug 22, thereby working together to fix the piston cylinder 2 in the base 1.

[0043] During assembly, two pins are simultaneously inserted and secured from both sides, resulting in a more even and stable force distribution on the piston cylinder 2, significantly enhancing its resistance to torsion and wobbling within the base 1. This design effectively prevents any slight rotation or displacement of the piston cylinder 2 due to unidirectional force or vibration during long-term use, ensuring that the precise axis of the piston's reciprocating motion within the cylinder remains unchanged, thereby guaranteeing the accuracy of braking action and the reliability of the seal. Simultaneously, the dual-pin structure also provides redundancy and backup safety; even if one connection point malfunctions, the other can still provide the necessary fixing force, further improving the safety and durability of the entire hydraulic brake lever during use.

[0044] In a specific embodiment, the lower part of the oil storage chamber 11 is provided with an enlarged area 111 with a diameter larger than the outer diameter of the piston cylinder. The side wall of the piston cylinder 2 is provided with a first oil hole 23 and a second oil hole 24. The piston chamber 21 of the piston cylinder 2 is connected to the oil storage chamber 11 through the enlarged area 111 and the first oil hole 23 and the second oil hole 24.

[0045] Piston cylinder 2 is installed within base 1, with its sidewall embedded in the enlarged region 111 at the lower part of oil reservoir 11. The diameter of the enlarged region 111 is larger than the outer diameter of piston cylinder 2, thus naturally forming an annular oil channel between the outer wall of piston cylinder 2 and the inner wall of the enlarged region 111. Furthermore, a first oil hole 23 and a second oil hole 24 are formed on the sidewall of piston cylinder 2, connecting the piston chamber 21 inside piston cylinder 2 to the outside, namely the aforementioned annular oil channel. Finally, this annular channel communicates with the main body of oil reservoir 11, thus forming a complete flow path that allows oil exchange between piston chamber 21 and oil reservoir 11.

[0046] The main function of the enlarged area 111 is to structurally create a space surrounding the piston cylinder 2. This space serves as a hub for oil collection and flow. Its design, which is much larger than the outer diameter of the piston cylinder, ensures smooth oil flow and provides the necessary space for connecting oil holes. The first oil hole 23 and the second oil hole 24 act as crucial connecting channels, connecting the enclosed piston chamber 21 inside the piston cylinder 2 with the external oil reservoir 11. This allows the oil to flow bidirectionally between the piston chamber 21 and the oil reservoir 11 according to the needs of braking operation, thereby achieving oil quantity compensation and pressure balance.

[0047] During operation, when the piston moves within the piston chamber 21, causing changes in internal oil pressure and quantity, oil flows in or out through the first oil hole 23 or the second oil hole 24. More specifically, the annular space provided by the enlarged region 111 acts as a buffer zone, capable of accommodating instantaneous oil flow and ensuring smooth oil exchange through multiple oil holes, avoiding flow bottlenecks that might occur with a single oil hole. This combination improves the efficiency and response speed of oil compensation, quickly balancing pressure fluctuations in the hydraulic system and ensuring the immediacy and linearity of braking force transmission.

[0048] In a specific embodiment, at least one sealing ring 4 is provided at the mounting interface between the piston cylinder 2 and the base 1.

[0049] The sealing ring 4 ensures the long-term reliable operation of the entire hydraulic braking system. Its core function is to form an effective barrier, preventing brake fluid stored in the reservoir 11 and flowing through the piston cylinder 2 from leaking out through the gap between the piston cylinder 2 and the base 1. Since the base 1 is typically made of plastic while the piston cylinder 2 is made of metal, the two materials have different coefficients of thermal expansion. Tiny gaps may occur under temperature changes or stress. The elastic properties of the sealing ring 4 compensate for these minor deformations and dimensional changes, maintaining the seal of the contact surface. Furthermore, a good seal not only prevents brake failure due to fluid loss but also prevents air and moisture from being drawn into the sealed hydraulic system, thus avoiding brake fluid deterioration and brake performance degradation. Therefore, although the sealing ring 4 is a simple component, it is an indispensable key element ensuring that the metal piston cylinder 2, embedded in the plastic base 1, can achieve its designed function, reach its expected lifespan, and maintain high performance.

[0050] In a specific embodiment, a reciprocating piston 5 is provided inside the piston cylinder 2, and two oil seals 6 are provided between the piston 5 and the inner wall of the piston cylinder 2 to seal the piston cavity 21.

[0051] The structure of the two oil seals 6 plays a crucial role in providing dual sealing and safety. Their most direct and core function is to ensure the absolute sealing of the piston chamber 21, preventing brake fluid leakage from both sides when the piston 5 actuates. When the user operates the brake lever 7 to push the piston 5 to build up hydraulic pressure, the high-pressure fluid acts on the oil seals 6. The first oil seal 6 bears the main sealing pressure, preventing fluid leakage to the non-pressure side, while the second oil seal 6 acts as a redundant safety barrier, greatly improving the reliability of the seal. This design significantly reduces the risk of the entire braking system failing due to the possible failure of a single seal. Simultaneously, these two oil seals 6 effectively prevent moisture and impurities from the outside air from entering the closed hydraulic system through the opening of the piston cylinder 2, thus maintaining the stability of the brake fluid and avoiding corrosion of internal parts and brake performance degradation. Therefore, the combination of the piston 5 and the two oil seals 6 is fundamental to ensuring that the hydraulic brake lever can generate and maintain a strong and stable braking force, allowing the entire system to maintain its designed performance and safety even under long-term use and harsh environments.

[0052] The specific working process of the hydraulic brake lever provided in this embodiment is as follows: When the user squeezes the brake lever, the lever drives the piston 5 to reciprocate inside the piston cylinder 2. Two oil seals 6 between the piston 5 and the inner wall of the piston cylinder 2 ensure dynamic sealing of the piston chamber 21, preventing high-pressure oil from leaking from the periphery of the piston 5, thus ensuring that all the thrust is used to build up oil pressure. The movement of the piston 5 compresses the brake fluid in the piston chamber 21, generating a high-pressure fluid flow. This high-pressure fluid then flows out through the first oil hole 23 and the second oil hole 24 on the side wall of the piston cylinder 2. The fluid flows into the annular space formed by the enlarged area 111 at the bottom of the reservoir 11. The diameter of the enlarged area 111 is larger than the outer diameter of the piston cylinder 2, providing a smooth flow channel for the fluid. The fluid finally enters the main cavity of the reservoir 11 through this channel and is pressed against the hydraulic caliper at the wheel along the connected oil pipe, pushing the brake pads of the caliper to clamp the disc, thereby achieving the braking function. Throughout the pressurization process, piston cylinder 2 is securely locked within the plastic base 1 via a fixing structure 3 formed by its end lug 22 and pin, ensuring the stability of the pressure-bearing component. Simultaneously, the sealing ring 4 at the mounting interface between piston cylinder 2 and base 1 effectively prevents high-pressure oil leakage from the joint surface of the two components. When the braking action ends and the user releases the lever, piston 5 retracts under the action of the return mechanism, and the pressure in piston chamber 21 decreases. At this time, the brake fluid in reservoir 11 undergoes backflow compensation under the action of elastic bladder 12. One side of elastic bladder 12 is in contact with the oil in reservoir 11, while the other side is connected to the atmosphere through vent hole 13 on base 1. More specifically, when the brake fluid expands or contracts due to temperature changes, atmospheric pressure acts on elastic bladder 12 through vent hole 13, causing it to deform and automatically absorb or replenish oil, thereby continuously maintaining the pressure balance and fullness of the hydraulic system, ensuring an immediate and powerful response for the next braking action. The entire working process combines the high wear resistance and high sealing performance of the metal piston cylinder 2 with the low cost and complex molding advantages of the non-metallic matrix 1, achieving a dual optimization of performance and cost.

[0053] Example 2 This embodiment provides a bicycle, which includes the hydraulic brake lever described in Embodiment 1. The bicycle can be a mountain bike.

[0054] The bicycle provided in this embodiment, by employing the aforementioned hydraulic brake lever, significantly reduces the overall manufacturing cost of the vehicle. This is due to the simplified structure achieved by using a plastic material for the brake lever base 1 and assembling the piston cylinder 2 as a separate component. Simultaneously, the bicycle achieves the same reliable and responsive braking performance because the metal piston cylinder 2 and its high-sealing design ensure excellent hydraulic actuation. Furthermore, the maintenance requirements of the entire braking system are reduced, and reliability is improved, providing riders with a more cost-effective and safer riding experience.

[0055] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous technical features can be freely combined and superimposed.

[0056] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A hydraulic brake lever, characterized in that, The hydraulic brake lever includes a base, a piston cylinder, and a fixing structure. The piston cylinder is a component independent of the base and is installed in the base through the fixing structure. The base and the piston cylinder are made of different materials.

2. The hydraulic brake lever according to claim 1, characterized in that, The piston cylinder is made of metal, while the substrate is made of non-metallic material.

3. The hydraulic brake lever according to claim 2, characterized in that, The substrate is made of plastic and has an integrally formed oil storage cavity inside.

4. The hydraulic brake lever according to claim 3, characterized in that, An elastic oil bladder is provided inside the oil storage cavity, and a vent is provided on the base. The vent is connected to the side of the elastic oil bladder facing away from the oil storage cavity to allow it to be connected to the atmosphere.

5. The hydraulic brake lever according to claim 1, characterized in that, The piston cylinder has a radially extending lug at its end. The fixing structure includes at least one pin that passes through a corresponding mounting hole on the base and engages with the lug to fix the piston cylinder in the base.

6. The hydraulic brake lever according to claim 5, characterized in that, The ear portion is two and arranged opposite to each other, and the fixing structure includes two pins, which are respectively engaged with the two ear portions.

7. The hydraulic brake lever according to claim 3, characterized in that, The lower part of the oil storage chamber is provided with an enlarged area with a diameter greater than the outer diameter of the piston cylinder. The side wall of the piston cylinder is provided with a first oil hole and a second oil hole. The piston chamber of the piston cylinder is connected to the oil storage chamber through the enlarged area and the first and second oil holes.

8. The hydraulic brake lever according to claim 1, characterized in that, At least one sealing ring is provided at the mounting interface between the piston cylinder and the base.

9. The hydraulic brake lever according to claim 7, characterized in that, The piston cylinder is equipped with a reciprocating piston, and two oil seals are provided between the piston and the inner wall of the piston cylinder to seal the piston cavity.

10. A bicycle, characterized in that, The bicycle includes the hydraulic brake lever as described in any one of claims 1-9.

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