An oil pressure balancing structure, a brake level, a brake caliper, and a wire pulling oil pressure conversion pump

Abstract

This invention relates to a hydraulic pressure balancing structure, a brake lever, a brake caliper, and a cable-operated hydraulic pressure conversion pump. The hydraulic pressure balancing structure is used in conjunction with a pump mechanism, which includes: at least one hydraulic cylinder chamber, located on the pump mechanism and radially connected to an outlet; at least one sump chamber, located on the pump mechanism and connected to the hydraulic cylinder chamber via a connecting hole, both containing brake fluid; and a hydraulic pressure balancing component movably disposed within the sump chamber to replenish brake fluid to the hydraulic cylinder chamber during braking, balancing the brake fluid pressure. During braking, the invention automatically replenishes the brake fluid in the sump chamber to the reduced-pressure hydraulic cylinder chamber, maintaining sufficient brake fluid in the braking system for braking and ensuring vehicle braking performance.

Description

[Technical Field]

[0001] This invention relates to the field of bicycle parts technology, specifically to a hydraulic balance structure, brake lever, brake caliper and cable-operated hydraulic conversion pump. [Previous Technology]

[0002] Cable-operated hydraulic disc brakes are a new type of disc brake that combines the advantages of cable-operated disc brakes and hydraulic disc brakes. They have lower costs and better braking experience.

[0003] The key component of a cable-operated hydraulic disc brake is the cable-operated hydraulic pressure conversion pump, which is used to convert the cable pulling force of the brake lever into hydraulic pressure and deliver it to the hydraulic down-pump. Existing cable-operated hydraulic pressure conversion pumps also have the disadvantages of traditional hydraulic disc brakes, namely, after a period of use, as the brake pads wear, the piston in the down-pump will require more brake fluid pressure to move forward to brake, and insufficient brake fluid pressure will cause brake failure;

[0004] At this time, it is necessary to open the oil hole sealed by the oil seal to replenish brake fluid into the cylinder cavity. The oil hole is generally opened on the oil sump cavity that is connected to the cylinder cavity. Opening the oil hole will allow air to enter the braking system. However, during the process of replenishing fluid and expelling air, due to the limitation of the oil circuit, the air in the braking system may not be completely expelled. The remaining air will not improve the brake failure of the braking system after replenishing fluid, or even increase the risk.

[0005] To this end, the present invention proposes a hydraulic pressure balance structure, a brake lever, a brake caliper, and a cable-operated hydraulic pressure conversion pump.

[0006] In view of this, we, the inventors, devoted ourselves to further research and development and improvement, hoping to solve the above problems with a better invention. After continuous experimentation and modification, this invention came into being. [Summary of the Invention]

[0007] The present invention provides an oil pressure balance structure, a brake lever, a brake caliper, and a cable-operated oil pressure conversion pump to at least solve the problem in the prior art that, during the process of replenishing fluid and purging air in the braking system, the internal air may not be completely expelled due to the limitation of the oil circuit, and the remaining air will cause the braking system to not improve after replenishing fluid, or even pose a greater risk.

[0008] In a first aspect, the present invention provides an oil pressure balancing structure, which is used in conjunction with a pump mechanism, characterized in that the pump mechanism is provided with:

[0009] A hydraulic cylinder chamber, the number of which is at least one, is opened on the pump mechanism and is radially connected to an oil outlet;

[0010] At least one oil sump chamber is provided on the pump mechanism and communicates with the cylinder chamber through a connecting hole, and the oil sump chamber and the cylinder chamber contain brake fluid.

[0011] A hydraulic pressure balancer is movably disposed in the oil sump cavity to replenish brake fluid to the cylinder cavity during braking action and balance the brake fluid pressure.

[0012] Optionally, the hydraulic balancing component includes:

[0013] The piston body is movably assembled in the oil sump cavity, and its annular outer wall is movably sealed with the inner wall of the oil sump cavity. When braking, it moves in the direction of the connecting hole to allow brake fluid to be replenished into the cylinder cavity and balance the brake fluid pressure.

[0014] An oil tank cover is fixedly assembled to the open end of the oil tank cavity, and the oil tank cover is provided with a balance hole that connects to the external atmospheric pressure.

[0015] Optionally, the hydraulic balance component also includes:

[0016] A fluid replenishment channel is axially opened in the middle of the piston body;

[0017] An oil seal plug, the middle of which has an external thread section, the external thread section being threaded to an internal thread surface formed on the inner wall of the fluid replenishment channel to seal the fluid replenishment channel.

[0018] Optionally, the inner cavity of the fluid replenishment channel is provided with an oil seal cone surface, and the tail of the oil seal plug is formed with a cone-shaped plug tail that cooperates with the oil seal cone surface to seal the fluid replenishment channel.

[0019] Optionally, the oil seal has an oil injection side hole in the axial middle part, and the first end of the oil injection side hole extends to the head of the oil seal and the second end extends to the annular sidewall of the oil seal near the conical tail.

[0020] Optionally, a sealing ring is provided on the annular outer wall of the piston body, and the annular outer wall of the sealing ring abuts and seals against the inner wall of the oil sump cavity.

[0021] Optionally, the diameter of the balance hole is at least larger than the diameter of the head of the oil seal plug.

[0022] In a second aspect, the present invention provides a brake lever, which is mounted on the handlebar of a vehicle frame, and has a pump mechanism therein and has the hydraulic pressure balance structure described in the first aspect.

[0023] In a third aspect, the present invention provides a brake caliper that is mounted on the front / rear wheel of a vehicle frame, and has a pump mechanism therein and has the hydraulic pressure balance structure described in the first aspect.

[0024] In a fourth aspect, the present invention provides a cable-operated hydraulic conversion pump, which is mounted on a vehicle frame and connected to the upper brake pump via a cable / oil pipe, and connected to the lower brake pump via an oil pipe. It has a pump mechanism and the hydraulic pressure balance structure described in the first aspect.

[0025] Compared with related technologies, the hydraulic pressure balance structure, brake lever, brake caliper, and cable-operated hydraulic pressure conversion pump provided by the present invention have at least the following technical effects:

[0026] By the piston body moving and assembling in the oil sump cavity and limiting the stroke by the oil sump cavity cover, as the brake pads wear, during the braking process, the brake fluid in the oil sump cavity automatically replenishes the oil to the cylinder cavity where the pressure is reduced, and the piston body moves in the direction of brake fluid output, thereby maintaining sufficient oil in the braking system for braking.

[0027] Details of one or more embodiments of the present invention are set forth in the following figures and description to make other features, objects and advantages of the invention more readily apparent.

Implementation Method

[0029] Regarding the technical means of us inventors, several preferred embodiments are described in detail below with reference to the accompanying drawings, so that you may gain a deeper understanding and acceptance of the present invention.

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any progressive efforts are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0033] In related technologies, the key component of cable-operated hydraulic disc brakes is the cable-operated hydraulic pressure conversion pump, which is used to convert the cable pulling force of the brake lever into hydraulic pressure and deliver it to the hydraulic down-pump. Existing cable-operated hydraulic pressure conversion pumps also have the disadvantages of traditional hydraulic disc brakes, namely, after a period of use, as the brake pads wear, the piston in the down-pump will require more brake fluid pressure to move forward to brake, and insufficient brake fluid pressure will cause brake failure;

[0034] At this time, it is necessary to open the oil hole sealed by the oil seal to replenish brake fluid into the cylinder cavity. The oil hole is generally opened on the oil sump cavity that is connected to the cylinder cavity. Opening the oil hole will allow air to enter the braking system. However, during the process of replenishing fluid and expelling air, due to the limitation of the oil circuit, the air in the braking system may not be completely expelled. The remaining air will not improve the brake failure of the braking system after replenishing fluid, or even increase the risk.

[0035] Based on the above, embodiments of the present invention provide a hydraulic balance structure, a brake lever, a brake caliper, and a cable-operated hydraulic conversion pump, which will be described in detail below with reference to specific embodiments and figures.

[0036] Example 1

[0037] This embodiment of the invention provides an oil pressure balancing structure. FIG1 is a perspective view of the oil pressure balancing structure according to an exemplary embodiment. FIG2 is a cross-sectional view of a pump mechanism according to an exemplary embodiment. As shown in FIG1 and FIG2, the oil pressure balancing structure is used in conjunction with a pump mechanism 10, which is provided with:

[0038] At least one cylinder chamber 101 is provided in the pump mechanism 10 and has an oil outlet 104 radially connected to it; In this embodiment, referring to Figures 1-2, there are two cylinder chambers 101 arranged in parallel.

[0039] At least one oil sump chamber 102 is provided on the pump mechanism 10 and is connected to the cylinder chamber 101 through a connecting hole 103. The oil sump chamber 102 and the cylinder chamber 101 contain brake fluid that can meet the braking requirements.

[0040] The hydraulic pressure balancer 20 is movably disposed in the oil sump cavity 102 to replenish brake fluid into the cylinder cavity 101 during braking action and balance the brake fluid pressure.

[0041] Figure 3 is an enlarged schematic diagram of structure A in Figure 2. Figure 4 is a perspective view of a hydraulic pressure balancing component according to an exemplary embodiment. Referring to Figures 1-4, in this embodiment, the hydraulic pressure balancing component 20 includes:

[0042] The piston body 201 is movably assembled in the oil sump cavity 102, and its annular outer wall is movably sealed with the inner wall of the oil sump cavity 102. When braking, it moves towards the connecting hole 103 so that brake fluid is replenished into the cylinder cavity 101 to balance the brake fluid pressure.

[0043] An oil tank cover 202 is fixedly assembled to the open end of the oil tank 102 by a cotter pin 204, and the oil tank cover 202 is provided with a balance hole 203 for communicating with the external atmospheric pressure. Further, referring to FIG3, in this embodiment, the open end of the oil tank 102 has a groove for assembling the oil tank cover 202 and the cotter pin 204 to fit and fix the oil tank cover 202.

[0044] In an optional embodiment, referring to Figures 3-4, a sealing ring 208 is fitted on the annular outer wall of the piston body 201, and the annular outer wall of the sealing ring 208 abuts and seals against the inner wall of the oil sump cavity 102.

[0045] In the above embodiment, referring to Figures 1-2 and 4, in the initial state, the piston body 201 is located in the oil sump cavity 102 on the side near the opening end of the oil sump cavity 102 and its stroke is limited by the oil sump cavity cover 202. As the brake pads wear, during the braking process, the brake fluid in the oil sump cavity 102 automatically replenishes the oil to the cylinder cavity 101 where the pressure is reduced. The piston body 201 moves in the direction of brake fluid output under the external atmospheric pressure, thereby maintaining sufficient oil in the braking system for braking.

[0046] Furthermore, during long-term use, as the brake pads wear down, the brake fluid in the sump chamber 102 can automatically replenish the cylinder chamber 101, which has reduced pressure. As a result, an expansion margin will gradually form between the piston body 201 and the sump chamber cover 202. When braking, the brake fluid will conduct heat from the brake pads and expand due to heat. The expanded brake fluid will enter the sump chamber 102 through the connecting hole 103 in the cylinder chamber 101, achieving pressure balance and thus avoiding the risk of disc lock-up, maintaining and optimizing the stable braking effect of the hydraulic disc brake. At this time, the brake fluid entering the sump chamber 102 will push the piston body 201 to move towards the sump chamber cover 202 in the sump chamber 102 to accommodate the expansion volume required by the brake fluid. When the brake fluid temperature drops, its volume shrinks and it automatically flows back into the cylinder chamber 101, which has reduced pressure. The piston body 301 will also gradually return to its original position under the action of external atmospheric pressure as the brake fluid flows back.

[0047] Furthermore, during vehicle installation, a certain expansion margin can be directly provided between the piston body 201 and the oil sump cover 202 to accommodate the expansion volume of the brake fluid due to heat.

[0048] In summary, the hydraulic pressure balance structure provided in Embodiment 1 of the present invention, through the movable assembly of the piston body 201 in the oil sump cavity 102 and the limit of the stroke by the oil sump cavity cover 202, as the brake pads wear, during the braking process, the brake fluid in the oil sump cavity 102 automatically replenishes the oil to the cylinder cavity 101 where the pressure is reduced, and the piston body 201 moves in the direction of brake fluid output, thereby maintaining sufficient oil in the braking system for braking.

[0049] Example 2

[0050] The difference between Embodiment 2 and Embodiment 1 is that FIG5 is a perspective view of the oil pressure balance structure according to the second exemplary embodiment. FIG6 is a perspective view of the pump mechanism according to the second exemplary embodiment. FIG7 is a perspective view of the oil pressure balance component according to the second exemplary embodiment. Referring to FIG5-7, in this Embodiment 2, the oil pressure balance component 20 further includes:

[0051] The fluid replenishment channel 205 is axially opened in the middle of the piston body 201;

[0052] An oil seal plug 206 has an external threaded section in its middle, which is threadedly fitted to an internal threaded surface formed on the inner wall of the fluid replenishment channel 205 to seal the fluid replenishment channel 205. It is understood that the diameter of the balance hole 203 is at least larger than the diameter of the plug head of the oil seal plug 206; preferably, the inner diameter of the balance hole 203 covers the oil filling side hole 207, so as to facilitate the entry of the output port of the oil filling tool for brake fluid replenishment operation; the inner cavity of the fluid replenishment channel 205 is provided with an oil seal cone surface, and the plug tail of the oil seal plug 206 forms a conical plug tail 2061 that cooperates with the oil seal cone surface to seal the fluid replenishment channel 205.

[0053] In an optional embodiment, referring to FIG7, an oil injection side hole 207 is provided in the axial middle part of the oil seal 206, and the first end of the oil injection side hole 207 extends to the head of the oil seal 206, and the second end extends to the annular sidewall of the oil seal 206 near the conical tail 2061; the diameter of the balance hole 203 is at least larger than the diameter of the head of the oil seal 206.

[0054] Other undescribed structures refer to Example 1.

[0055] When brake fluid needs to be replenished in the pump mechanism 10, insert the output port of the lubrication tool into the lubrication side hole 207 and pre-inject a small amount of brake fluid to expel residual air in the lubrication side hole 207 and the replenishment channel 205. Then, use the tool to turn the head of the oil seal plug 206 and loosen it slightly along the thread direction. At this time, the conical plug tail 2061 and the middle of the oil seal cone surface form an annular fluid inlet channel. This fluid inlet channel is connected to the second end of the lubrication side hole 207. At this time, the brake fluid can directly enter the oil sump cavity 102. No air will enter the braking system, realizing rapid brake fluid replenishment and ensuring vehicle braking performance.

[0056] At the same time, it is understood that the sealing ring 208 fitted on the oil seal 206 and the inner wall of the oil injection hole 207 are still in an interference fit state to avoid brake fluid leakage during the replenishment state.

[0057] In summary, the hydraulic pressure balance structure provided in Embodiment 2 of the present invention, through the movable assembly of the piston body 201 in the oil sump cavity 102 and the limit stroke of the oil sump cavity cover 202, as the brake pads wear, during the braking process, the brake fluid in the oil sump cavity 102 automatically replenishes the oil in the cylinder cavity 101 where the pressure is reduced, and the piston body 201 moves in the direction of brake fluid output, thereby maintaining sufficient oil in the braking system for braking; when fluid needs to be replenished in the pump mechanism 10, a fluid injection tool is inserted into the oil injection side hole 207, and the oil seal plug 206 is loosened by turning it in the opposite direction along the thread, and a fluid inlet channel is generated between the conical plug tail 2061 and the conical surface of the oil seal, and the fluid inlet channel is connected to the second end of the oil injection side hole 207. At this time, the injected brake fluid can directly enter the oil sump cavity 102, realizing rapid brake fluid replenishment, and no air will enter the braking system, ensuring the vehicle braking performance.

[0058] Example 3

[0059] Embodiment 3 of the present invention provides a brake lever, which is mounted on the handlebars of a bicycle frame. FIG8 is a perspective view of the pump mechanism according to a third exemplary embodiment. FIG9 is an exploded view of the hydraulic balance component according to a third exemplary embodiment. Referring to FIG1 or FIG8-9, a pump mechanism 10 is provided therein and has the hydraulic balance structure of Embodiment 1 or Embodiment 2. A hydraulic piston 40 is mounted in the cylinder chamber 101 of the pump mechanism 10, and the hydraulic piston 40 is movably connected to the handbrake lever 50 through a piston rod, so that when the handbrake lever 50 is squeezed, the hydraulic piston 40 is driven to move in the cylinder chamber 101, thereby driving the oil to reach the brake caliper for braking.

[0060] Example 4

[0061] Embodiment 4 of the present invention provides a brake caliper (not shown in the figure), which is mounted on the front / rear wheel of the vehicle frame, and has a pump mechanism 10 and an oil pressure balance structure as in Embodiment 1 or Embodiment 2.

[0062] Example 5

[0063] Embodiment 5 of the present invention provides a cable-operated hydraulic conversion pump, which is mounted on the vehicle frame and connected to the upper brake pump via a cable / oil pipe, and connected to the lower brake pump via an oil pipe. Referring to Figures 5 to 7, it is provided with a pump mechanism 10 and has the hydraulic pressure balance structure of Embodiment 1 or Embodiment 2.

[0064] Unlike Embodiment 1 or Embodiment 2, the oil tank cover 202 is fixedly assembled on the pump mechanism 10 by cover plate bolts 2041.

[0065] In this embodiment, a cable-driven hydraulic pump 30 is movably installed in the cylinder chamber 101 of the cable-driven hydraulic pump. The cable-driven hydraulic pump 30 is used to drive the brake fluid in the cylinder chamber 101 to be output from the outlet 104 when braking is applied.

[0066] FIG10 is an exploded view of a pump mechanism according to a second exemplary embodiment. Referring to FIG10, in this embodiment, there are two cylinder chambers 101, and two wire-driven hydraulic actuators 30 are also present, each located within one of the two cylinder chambers 101. The wire-driven hydraulic actuator 30 includes:

[0067] The piston rod 301 is movably assembled in the cylinder cavity 101, and a hollow hole for threading a pull wire is axially opened in its middle.

[0068] A sealing ring 309 is movably sleeved on the first end of the piston rod 301 and limited to the stepped portion formed on the inner wall of the cylinder cavity 101;

[0069] The piston ring 302 is radially sleeved on the platform formed in the middle of the piston rod 301, and its outer wall surface abuts against the inner wall of the cylinder cavity 101. A brake fluid cavity is formed between the piston ring 302 and the sealing ring 309. The brake fluid cavity is connected to the connecting hole 103 and the oil outlet 104.

[0070] The plug base 306 is threadedly fitted to the first open end of the cylinder cavity 101 and presses and fixes the axial position of the sealing ring 309, and a first movable cavity is provided in the middle.

[0071] Elastic member 305, one end of which is limited and fitted into the hollow hole, and the second end extends into the first movable cavity to provide elastic restoring force after the piston rod 301 moves.

[0072] The end cover plate 303 covers the second opening end of the cylinder cavity 101 to limit the starting point of the piston rod 301's stroke, and has a second assembly hole 3031 on it; further, referring to FIG10, the end cover plate 303 and the oil sump cavity cover 202 are integrally formed, saving parts and reducing assembly steps.

[0073] The wire clip terminal 304 has its first end passing through the second mounting hole 3031 and threadedly assembled with the second end of the piston rod, and is provided with a wire locking screw to fix the pull wire.

[0074] Referring again to Figure 10, the wire-pull oil drive component 30 also includes:

[0075] A wire threading sleeve 308 is inserted into the end cap base 306 to thread a pull wire;

[0076] A sealing threaded sleeve 307 is threadedly fitted to one end of the plug base 306 away from the sealing ring 309 to fix the threaded sleeve 308 and close the first open end of the cylinder cavity 101.

[0077] Continuing to refer to Figures 5-6, in this embodiment, there are two oil pool cavities 102. The two oil pool cavities 102 are opened on the same horizontal axis and their opening ends are symmetrically distributed. Each oil pool cavity 102 and each oil cylinder cavity 101 are connected one-to-one through the connecting hole 103.

[0078] It is understood that a single oil tank cavity 102 may also be provided, and the single oil tank cavity 102 is connected to the two oil cylinder cavities 101 through the connecting hole 103.

[0079] In the above embodiment, when installed on a vehicle, a single cable-driven hydraulic actuator 30 is used in conjunction with a brake lever and a hydraulic pump. Specifically, the first end of the cable is connected to the brake lever, and the second end passes through the hollow hole of the cable-driven hydraulic actuator 30 and is fixed to the cable buckle terminal 304 by a cable locking screw; the first end of the oil pipe is connected to the oil outlet 104 through an oil pipe connector, and the second end is connected to the hydraulic pump mounted on the front / rear wheel of the bicycle frame.

[0080] When the brake lever is squeezed, the piston rod 301 is pulled by the cable and moves axially forward in the cylinder chamber 101. Through the piston ring 302, the brake fluid in the brake fluid chamber is driven to be output through the outlet 104. Then, it enters the hydraulic pump at the front / rear wheel through the oil pipe. The hydraulic pump clamps the disc of the front / rear wheel to perform hydraulic braking. The oil circuit is smooth and the braking is stable.

[0081] For other undescribed structures, refer to Example 1 or Example 2.

[0082] In summary, the hydraulic pressure balance structure, brake lever, brake caliper, and cable-operated hydraulic pressure conversion pump provided in this embodiment of the invention, through the movable assembly of the piston body 201 in the oil sump cavity 102 and the limit of the stroke by the oil sump cavity cover 202, as the brake pads wear, during the braking process, the brake fluid in the oil sump cavity 102 automatically replenishes the oil in the cylinder cavity 101 where the pressure is reduced, and the piston body 201 moves in the direction of brake fluid output, thereby maintaining sufficient oil in the braking system for braking; when fluid needs to be replenished in the pump mechanism 10, a fluid injection tool is inserted into the oil injection side hole 207, and the oil seal plug 206 is loosened by turning it in the opposite direction along the thread, and a fluid inlet channel is generated between the conical plug tail 2061 and the conical surface of the oil seal. The fluid inlet channel is connected to the second end of the oil injection side hole 207. At this time, the injected brake fluid can directly enter the oil sump cavity 102, and no air will enter the braking system, realizing rapid brake fluid replenishment and ensuring vehicle braking performance.

[0083] In summary, the technical means disclosed in this invention can effectively solve the problems of the prior art and achieve the expected purpose and effect. Moreover, it has not been published or publicly used before the application and has long-term progressiveness. It is indeed an invention as defined by the Patent Law. Therefore, the application is filed in accordance with the law. I earnestly request Your Excellency to give a detailed review and grant me an invention patent. I am deeply grateful for Your Excellency's kindness.

[0084] However, the above description is only a few preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the specification of the present invention should still fall within the scope of the patent of the present invention. [Simplified Explanation of the Diagram]

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without any further effort. [Figure 1] is a perspective view of an oil pressure balance structure according to an exemplary embodiment; [Figure 2] is a cross-sectional view of a pump mechanism according to an exemplary embodiment; [Figure 3] is an enlarged schematic diagram of structure A in Figure 2; [Figure 4] is a perspective view of an oil pressure balance component according to an exemplary embodiment; [Figure 5] is a perspective view of an oil pressure balance structure according to a second exemplary embodiment; [Figure 6] is a perspective view of a pump mechanism according to a second exemplary embodiment; [Figure 7] is a perspective view of an oil pressure balance component according to a second exemplary embodiment; [Figure 8] is a perspective view of a pump mechanism according to a third exemplary embodiment; [Figure 9] is an exploded view of an oil pressure balance component according to a third exemplary embodiment; [Figure 10] is an exploded view of a pump mechanism according to a second exemplary embodiment.

Claims

1. A hydraulic pressure balancing structure, used in conjunction with a pump mechanism, characterized in that the pump mechanism comprises: at least one hydraulic cylinder chamber, which is opened on the pump mechanism and has an oil outlet radially connected thereto; at least one hydraulic sump chamber, which is opened on the pump mechanism and communicates with the hydraulic cylinder chamber through a connecting hole, and the hydraulic sump chamber and the hydraulic cylinder chamber contain brake fluid; a hydraulic pressure balancing component, which is movably disposed in the hydraulic sump chamber to replenish brake fluid into the hydraulic cylinder chamber during braking to balance the brake fluid pressure; the hydraulic pressure balancing component comprises: a piston body, which is movably assembled in the hydraulic sump chamber, and whose annular outer wall is movably sealed to the inner wall of the hydraulic sump chamber, which moves toward the connecting hole during braking to replenish brake fluid into the hydraulic cylinder chamber to balance the brake fluid pressure; and a hydraulic sump chamber cover, which is fixedly assembled to the open end of the hydraulic sump chamber, and the hydraulic sump chamber cover has a balancing hole communicating with external atmospheric pressure.

2. The hydraulic pressure balancing structure as described in claim 1, wherein, The hydraulic balancing component also includes: a fluid replenishment channel, which is axially opened in the middle of the piston body; and an oil seal, the middle of which has an external thread section, which is threaded to an internal thread surface formed on the inner wall of the fluid replenishment channel to seal the fluid replenishment channel.

3. The hydraulic pressure balancing structure as described in claim 2, wherein, The inner cavity of the fluid replenishment channel is provided with an oil seal cone surface, and the tail of the oil seal plug is formed with a cone-shaped plug tail that cooperates with the oil seal cone surface to seal the fluid replenishment channel.

4. The hydraulic pressure balancing structure as described in claim 3, wherein, The oil seal has an oil injection side hole in its axial middle part, and the first end of the oil injection side hole extends through to the head of the oil seal, and the second end extends through to the annular sidewall of the oil seal near the conical tail.

5. The hydraulic pressure balancing structure as described in claim 1, wherein, A sealing ring is fitted on the annular outer wall of the piston body, and the annular outer wall of the sealing ring abuts against the inner wall of the oil sump cavity for sealing.

6. The hydraulic pressure balancing structure as described in claim 4, wherein, The diameter of the balance hole is at least larger than the diameter of the head of the oil seal plug.

7. A brake lever, mounted on the handlebars of a bicycle frame, characterized in that it has a pump mechanism and a hydraulic pressure balancing structure as described in any one of claims 1 to 6.

8. A brake caliper mounted on the front / rear wheel of a vehicle frame, characterized in that it has a pump mechanism and a hydraulic pressure balancing structure as described in any one of claims 1 to 6.

9. A cable-operated hydraulic conversion pump, which is mounted on a vehicle frame and connected to an upper brake pump via a cable / hydraulic hose, and connected to a lower brake pump via a hydraulic hose, characterized in that it has a pump mechanism and a hydraulic pressure balancing structure as described in any one of claims 1 to 6.

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