Brake fluid venting system

Abstract

The application discloses a brake fluid exhaust system, comprising an exhaust device; the exhaust device comprises a liquid suction pipe, a first pressure providing device, a liquid discharge pipe and a waste liquid tank; the liquid suction pipe is configured to be connected with a gas release valve, the gas release valve is a gas release valve on a wheel brake sub-pump, and the wheel brake sub-pump is a wheel brake sub-pump of a vehicle brake system; an inlet of the first pressure providing device is connected with the liquid suction pipe, and an outlet of the first pressure providing device is connected with the liquid discharge pipe; the liquid discharge pipe is connected with the waste liquid tank, and the first pressure providing device is used for providing the pressure of suction brake fluid. Compared with the related art, the brake fluid exhaust system disclosed by the application can automatically perform the liquid discharge process, can be quickly completed, and the efficiency is greatly improved; originally, a plurality of people need to cooperate repeatedly to complete the operation, and the present scheme can be easily completed by only one person, and the operation personnel basically have no operation experience, cooperation degree and physical ability requirements, and human resources are saved.

Description

Technical Field

[0001] This application relates to the field of brake fluid technology, and more specifically, to a brake fluid venting system. Background Technology

[0002] Currently, passenger cars and microcars all use hydraulic braking systems. The brake fluid in the braking system is filled in the reservoir and brake fluid lines. When the brake pedal is pressed, the force is transmitted through the brake push rod to move the master cylinder piston, which is then transmitted through the brake fluid to the wheel cylinder pistons, pushing the brake shoes outwards (in disc brakes, the calipers clamp them). The braking effect is achieved through the friction between the brake shoes and the brake drum (in disc brakes, the friction pads and the brake disc). Brake fluid, also known as brake oil, is the liquid medium that transmits braking pressure in a hydraulic braking system. It is incompressible. In the sealed brake lines filled with brake fluid, when the brake fluid is subjected to pressure from the brake pedal, because liquids are incompressible, the pressure output from the master cylinder is quickly and evenly transmitted to each brake caliper.

[0003] After the brake system is repaired, the brake fluid is replaced, or the master cylinder, wheel cylinders, and brake lines are disassembled and reassembled, air may seep into the brake system lines. When the pressure increases, the air bubbles are compressed, causing the elastic behavior of the brake transmission path and increasing the brake pedal travel, resulting in a decrease in braking force and a significant reduction in braking efficiency, which greatly affects driving safety. Therefore, it is necessary to remove the air that has seeped into the brake system.

[0004] Existing technology typically involves manual bleed operation and adding new brake fluid. The bleed process requires three people to coordinate and cooperate, which is cumbersome, requires a lot of manpower, is inefficient, and demands high levels of operational experience, physical strength, and teamwork. It also suffers from problems such as incomplete bleeding and inaccurate control of the fluid level in the reservoir.

[0005] Therefore, how to improve the efficiency of brake fluid bleed has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this application is to disclose a brake fluid bleed system to improve the efficiency of brake fluid bleed.

[0007] A brake fluid bleed system, including a bleed device;

[0008] The waste discharge device includes a suction pipe, a first pressure supply device, a discharge pipe, and a waste fluid tank; the suction pipe is configured to be connected to a vent valve, which is a vent valve on a wheel brake caliper, and the wheel brake caliper is a wheel brake caliper of a vehicle braking system; the inlet of the first pressure supply device is connected to the suction pipe, and the outlet of the first pressure supply device is connected to the discharge pipe; the discharge pipe is connected to the waste fluid tank, and the first pressure supply device is used to provide pressure for suction of brake fluid.

[0009] In one possible implementation, a first flow meter and a second flow meter are also included. The first flow meter is used to detect the flow rate in the suction pipe and output the suction flow rate value; the second flow meter is used to detect the flow rate in the discharge pipe and output the discharge flow rate value.

[0010] In one possible implementation, a controller is also included; the controller is configured to shut down the first pressure supply device when the difference between the pumping flow rate and the draining flow rate is less than a preset difference, provided that the first pressure supply device is activated.

[0011] In one possible implementation, a new fluid supply device is also included, which is used to replenish brake fluid to a reservoir, which is the reservoir of the vehicle's braking system.

[0012] In one possible implementation, the new liquid supply device includes a first replenishment pipe, a second replenishment pipe, a second pressure supply device, and a new liquid storage tank.

[0013] The first replenishment pipe is configured to be connected to the storage tank, the inlet of the second pressure supply device is connected to the second replenishment pipe, the outlet of the second pressure supply device is connected to the first replenishment pipe, and the second replenishment pipe is connected to the new liquid storage tank.

[0014] In one possible implementation, when the first pressure supply device and the second pressure supply device are turned on, the second pressure supply device is turned off when the liquid level in the storage tank is higher than or equal to the highest preset liquid level.

[0015] In one possible implementation, when the first pressure supply device is activated, the second pressure supply device is activated when the liquid level in the storage tank is lower than a minimum preset liquid level; the minimum preset liquid level is higher than the minimum normal operating liquid level of the storage tank and lower than the maximum preset liquid level.

[0016] In one possible implementation, a mobile base is also included, the mobile base being equipped with wheels; the waste discharge device and the new liquid supply device are mounted on the mobile base.

[0017] In one possible implementation, the center of gravity of the movable base is located between the new liquid supply device and the waste discharge device.

[0018] In one possible implementation, a winding portion is also included for receiving the extraction tube and / or the first replenishment tube.

[0019] The brake fluid bleed system disclosed in this application operates by connecting a suction pipe to the vehicle's vent valve, opening the vent valve, activating the first pressure supply device, and then using a waste fluid bleed device to extract old brake fluid mixed with air from the vehicle's brake lines. This old brake fluid is then drained into the waste fluid tank through the suction and drain pipes. Simultaneously, the operator replenishes new brake fluid to the vehicle's brake system reservoir to prevent the brake fluid level from becoming too low. This bleed and replenishment process is repeated for each wheel brake caliper, thus completing the brake fluid bleed operation of the vehicle's brake system.

[0020] Compared to related technologies, the brake fluid venting system disclosed in this application automatically vents the fluid, which can be completed quickly and significantly improves efficiency. What used to require multiple people to work together repeatedly can now be easily completed by one person. Furthermore, it requires virtually no operating experience, cooperation, or physical strength from the operator, thus saving human resources. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the brake fluid bleed system disclosed in the embodiments of this application;

[0023] Figure 2 This is a flow chart of the brake fluid bleed system disclosed in the embodiments of this application;

[0024] Figure 3 This is a flowchart illustrating the fluid replenishment process of the brake fluid bleed system disclosed in an embodiment of this application.

[0025] The attached figures are labeled as follows:

[0026] 10. Brake fluid bleed system; 20. Bleeding valve; 30. Fluid reservoir; 40. Wheels; 50. Fluid level sensor;

[0027] 100. Waste discharge device; 110. Liquid extraction pipe; 120. First pressure supply device; 130. Liquid discharge pipe; 140. Waste liquid tank; 150. First flow meter; 160. Second flow meter;

[0028] 200. Fresh fluid supply device; 210. First replenishment pipe; 220. Second replenishment pipe; 230. Second pressure supply device; 240. Fresh fluid storage tank;

[0029] 300. Mobile base;

[0030] 400. Controller;

[0031] 500. Signal wiring. Detailed Implementation

[0032] The purpose of this application is to disclose a brake fluid bleed system to improve the efficiency of brake fluid bleed.

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] See Figure 1 The brake fluid bleed system 10 disclosed in this application is used to bleed the hydraulic braking system of a vehicle, and includes a bleed device 100. The bleed device 100 is used to draw and recover brake fluid mixed with air from each wheel brake caliper. The wheel brake calipers are key components of the vehicle braking system, ensuring rapid and accurate deceleration and stopping of the vehicle with each braking action by transmitting and controlling braking pressure. Each wheel brake caliper is equipped with a bleed valve 20, which releases air from the brake fluid to ensure the effective operation of the braking system.

[0035] The waste fluid discharge device 100 includes a suction pipe 110, a first pressure supply device 120, a discharge pipe 130, and a waste fluid tank 140. The suction pipe 110 is configured to connect to the vent valve 20 of the wheel brake caliper. The connection end of the suction pipe 110 may have a dedicated connector for a sealed connection with the vent valve 20. The first pressure supply device 120 may be a fluid transfer pump, such as a peristaltic pump or a corrosion-resistant diaphragm pump, with its inlet connected to the suction pipe 110 and its outlet connected to the discharge pipe 130. When the first pressure supply device 120 is operating, it generates suction at the vent valve 20, actively drawing out the brake fluid mixed with air. The outlet of the discharge pipe 130 is connected to the waste fluid tank 140 to collect and store the drawn brake fluid.

[0036] During the operation of the brake fluid bleed system 10 disclosed in this application, the suction pipe 110 is connected to the vehicle's vent valve 20. The vent valve 20 is opened, and the first pressure supply device 120 is activated. The waste fluid bleed device 100 extracts old brake fluid mixed with air from the vehicle's brake lines and drains it into the waste fluid tank 140 through the suction pipe 110 and the drain pipe 130. Simultaneously, the operator replenishes new brake fluid to the vehicle's brake system reservoir to prevent insufficient brake fluid in the system. This bleed and replenishment process is repeated for each wheel brake caliper, thus completing the brake fluid bleed operation for the entire vehicle's brake system.

[0037] Compared to related technologies, the brake fluid venting system 10 disclosed in this application automatically vents the fluid, which can be completed quickly and significantly improves efficiency. What used to require multiple people to cooperate and operate repeatedly can now be easily completed by one person. Moreover, it requires virtually no operating experience, cooperation, or physical strength from the operator, thus saving human resources.

[0038] To detect the flow rate in the suction pipe 110 and the discharge pipe 130, the brake fluid bleed system 10 also includes a first flow meter 150 and a second flow meter 160. The first flow meter 150 and the second flow meter 160 can be turbine flow meters or electromagnetic flow meters. The first flow meter 150 is installed on the suction pipe 110 near the vent valve 20 to detect the flow rate in the suction pipe 110 and output the suction flow rate value. The second flow meter 160 is installed on the discharge pipe 130 near the waste fluid tank 140 to detect the flow rate in the discharge pipe 130 and output the discharge flow rate value. This design facilitates operators in judging the pipe connection status and performing leak checks. If the first flow meter 150 and the second flow meter 160 detect a continuous and stable flow rate, the pipe connection is normal, and drainage begins. If the flow rate is zero or extremely low, problems such as loose connections, severe pipe bends, or blockages may occur, allowing operators to promptly investigate and avoid ineffective operations.

[0039] To improve the automation level of the brake fluid bleed system 10, the brake fluid bleed system 10 may further include a controller 400. The first flow meter 150 and the second flow meter 160 are signal-connected to the controller 400 via signal wiring 500. The controller 400 is configured to, when the first pressure supply device 120 is activated, shut down the first pressure supply device 120 when the difference between the pumping flow rate and the draining flow rate is less than a preset difference, as follows: Figure 2 As shown.

[0040] After securely connecting the suction pipe 110 to the vent valve 20 connector, turn on the controller 400 switch. The first pressure supply device 120 extracts the old brake fluid mixed with air from the vehicle's brake lines and discharges it into the waste fluid tank 140 via the drain pipe 130. Simultaneously, the first flow meter 150 and the second flow meter 160 continuously transmit the collected flow data to the controller 400 through their respective signal connectors 500. The controller 400 compares and analyzes the flow data. When the brake fluid contains air, the air reduces the compressibility of the brake fluid, thereby causing a decrease in the output flow rate of the first pressure supply device 120, and the suction flow rate (Q) decreases. 抽 The value will be greater than the drainage flow rate (Q). 排 A preset difference is pre-set within the controller 400, in Q. 抽 -Q 排 If the difference is greater than or equal to the preset value, the controller 400 will continuously control the first pressure supply device 120 to operate, pumping the brake fluid containing air into the waste fluid tank 140; once the air in the brake fluid is completely removed, Q... 抽 -Q 排 If the pressure difference exceeds the preset value, the controller 400 will send a stop signal to the first pressure supply device 120, and the first pressure supply device 120 will stop pumping fluid. The completeness of brake fluid gas discharge is detected by relevant sensors and compared and analyzed by the controller 400, completely eliminating errors introduced by human factors.

[0041] To achieve automatic brake fluid replenishment, the brake fluid bleed system 10 also includes a new fluid supply device 200, which replenishes brake fluid to the reservoir 30. The new fluid supply device 200 can consist of a storage tank connected to a positive pressure source and a replenishment pipeline. The positive pressure source pressurizes the storage tank, causing new brake fluid to be forced into the reservoir 30 through the replenishment pipeline. Alternatively, the new fluid supply device 200 can also consist of a storage tank and a replenishment pipeline equipped with a replenishment pump. The reservoir 30 is the brake fluid reservoir for the vehicle's braking system, and it has a built-in level sensor 50 that monitors the brake fluid level in real time. This design eliminates the need for operators to touch or observe the brake fluid during automated bleed and replenishment processes, and avoids splashing and leakage / overflow, eliminating the risk of brake fluid corrosion and contamination to personnel and vehicles, reducing labor costs, and minimizing the risk of system contamination due to improper manual operation.

[0042] In one specific embodiment, the new fluid supply device 200 includes a first replenishment pipe 210, a second replenishment pipe 220, a second pressure supply device 230, and a new fluid storage tank 240.

[0043] The first replenishment pipe 210 is configured to connect to the storage tank 30. The second pressure supply device 230 can be a replenishment pump, such as a small gear pump or diaphragm pump, with its inlet connected to the second replenishment pipe 220 and its outlet connected to the first replenishment pipe 210. The second replenishment pipe 220 connects to the bottom of the new fluid storage tank 240. This design allows the second pressure supply device 230 to overcome elevation differences and pipeline resistance, delivering new fluid to the storage tank 30. This enables the new fluid storage tank 240 to be placed anywhere, such as on the ground or under a rack, resulting in a more compact and user-friendly overall design. It also allows for the use of a large-capacity new fluid storage tank 240 to meet the needs of continuously servicing multiple vehicles.

[0044] To achieve fully automated control, the controller 400 can also be used to control the new liquid supply device 200, as shown in the process... Figure 3 As shown. The controller 400 is connected to the liquid level sensor 50 built into the liquid storage tank 30 via signal wiring 500. When the first pressure supply device 120 and the second pressure supply device 230 are turned on, the second pressure supply device 230 is turned off when the liquid level in the liquid storage tank 30 is higher than or equal to the highest preset liquid level.

[0045] Before the system officially starts working, the liquid level sensor 50 built into the liquid storage tank 30 is first calibrated. When the liquid level in the liquid storage tank 30 is at the upper limit position, the highest preset liquid level H is input to the controller 400. max .

[0046] The second pressure supply device 230 is activated either by program control or manually to replenish the brake fluid. The replenishment and drainage processes occur simultaneously and independently. As the new fluid supply device 200 continuously replenishes the brake fluid into the reservoir 30, the fluid level in the reservoir 30 will rise. The level sensor 50 transmits the measured level value h of the reservoir 30 to the controller 400 in real time, and compares the level value h with the calibration input H. max Perform a comparison. When h ≥ H max When this occurs, the controller 400 issues a command to stop replenishing the brake fluid, and the second pressure supply device 230 stops working. Brake fluid is highly corrosive and can cause serious damage to the vehicle's paint, rubber parts, electronic components, etc. This design not only achieves automatic shut-off of the new fluid supply device 200, but also effectively prevents brake fluid from overflowing from the vehicle's reservoir 30's filler neck, thus avoiding accidents.

[0047] Based on the above scheme, the controller 400 can also be used to control the activation of the new liquid supply device 200. When the first pressure supply device 120 is activated, the second pressure supply device 230 activates when the liquid level is lower than the minimum preset liquid level. Before the system officially starts operating, the minimum preset liquid level H is input to the controller 400. min Minimum preset liquid level H minThe minimum normal operating liquid level is 30 mm above the storage tank.

[0048] During the brake fluid discharge process, the vehicle's reservoir 30 continuously replenishes the brake lines with new brake fluid, causing the fluid level in the reservoir 30 to continuously decrease. The controller 400 compares the fluid level value h with the calibration input value H. min Compare the results when h ≤ H min When the liquid level drops, the controller 400 will activate the second pressure supply device 230 to replenish the liquid. This ensures that the height of the storage tank 30 is consistently maintained at H during the drainage process. min To H max The brake fluid level remains within the normal range. This design ensures that the brake fluid level in the brake lines is always within the normal operating range by automatically replenishing the brake fluid in a timely manner. Minimum preset level H min Setting it to be close to but above the minimum normal operating fluid level means that after each start-up, it takes longer to replenish the fluid level from the minimum to the maximum. With the total replenishment amount remaining the same, this significantly reduces the number of start-ups and shutdowns of the second pressure supply device 230, thereby improving the reliability and service life of the second pressure supply device 230 and even the entire brake fluid bleed system 10.

[0049] To enhance ease of operation, the brake fluid bleed system 10 may also include a mobile base 300. The mobile base 300 can be a small cart with a handle and wheels. The waste bleed device 100 and the new fluid supply device 200 are mounted on the mobile base 300. Operators can easily push the mobile base 300 to the workstation of any vehicle awaiting maintenance for convenient operation. This avoids the need to move vehicles specifically for equipment use or wait for fixed workstations to become available, significantly improving equipment utilization. Compared to fixed-installation equipment that permanently occupies floor or wall space, the mobile base 300 transforms the brake fluid bleed system 10 into a compact integrated unit that can be pushed to a corner or dedicated tool shed when not in use. This is suitable for scenarios with limited space or requiring frequent layout adjustments, providing significant flexibility in space planning.

[0050] To optimize spatial layout, the center of gravity of the mobile base 300 is located between the new fluid supply device 200 and the waste discharge device 100. The controller 400 can be positioned between the new fluid supply device 200 and the waste discharge device 100. The new fluid supply device 200 and the waste discharge device 100 are the two main variable load units on the vehicle. Placing the center of gravity of the mobile base 300 between these two units means that regardless of changes in the levels of the new fluid storage tank 240 and the waste fluid tank 140, the lateral shift of the entire system's center of gravity is minimal. When the mobile base 300 is pushed, especially over slightly uneven ground, the balanced load distribution greatly reduces the risk of the vehicle tilting, swaying, or even overturning due to a shift in the center of gravity, protecting the pumps, valves, and electronic equipment on the vehicle.

[0051] In one specific embodiment, the brake fluid bleed system 10 may further include a winding section for receiving the suction pipe 110 and / or the first replenishment pipe 210. The winding section may be a spool or a self-retractable reel, allowing the pipe to be pulled out to any length and then fixed. When the brake fluid bleed system 10 is not in operation, the pipe can be retracted and stored in the winding section, preventing the pipe from dragging on the ground, getting tangled, or tripping people. It also avoids the pipe being run over by wheels, scratched by tools, or coming into contact with oil or high-temperature components, extending the pipe's lifespan, reducing the risk of brake fluid leakage or pressure loss due to pipe damage, improving equipment reliability, and reducing maintenance costs.

[0052] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed. Additionally, in the description of embodiments in this application, "a plurality of" means two or more.

[0053] In the description of this application, it should be understood that the terms "height," "thickness," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application 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 application. In the description of this application, "a plurality of" means two or more, and "at least one" can mean one, two, or more, unless otherwise expressly specified.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A brake fluid bleed system, characterized in that, Includes waste discharge device (100); The waste discharge device (100) includes a suction pipe (110), a first pressure supply device (120), a discharge pipe (130), and a waste fluid tank (140); the suction pipe (110) is configured to be connected to a vent valve (20), which is a vent valve (20) on a wheel brake caliper, and the wheel brake caliper is a wheel brake caliper of a vehicle braking system; the inlet of the first pressure supply device (120) is connected to the suction pipe (110), and the outlet of the first pressure supply device (120) is connected to the discharge pipe (130); the discharge pipe (130) is connected to the waste fluid tank (140), and the first pressure supply device (120) is used to provide pressure for suction of brake fluid.

2. The brake fluid bleed system as described in claim 1, characterized in that, It also includes a first flow meter (150) and a second flow meter (160). The first flow meter (150) is used to detect the flow rate in the liquid extraction pipe (110) and output the liquid extraction flow rate value; the second flow meter (160) is used to detect the flow rate in the liquid discharge pipe (130) and output the liquid discharge flow rate value.

3. The brake fluid bleed system as described in claim 2, characterized in that, It also includes a controller (400); the controller (400) is configured to shut down the first pressure supply device (120) when the difference between the pumping flow rate value and the draining flow rate value is less than a preset difference, while the first pressure supply device (120) is turned on.

4. The brake fluid bleed system as described in claim 1, characterized in that, It also includes a new fluid supply device (200) for replenishing brake fluid to a reservoir (30), which is the reservoir (30) of the vehicle braking system.

5. The brake fluid bleed system as described in claim 4, characterized in that, The new liquid supply device (200) includes a first replenishment pipe (210), a second replenishment pipe (220), a second pressure supply device (230), and a new liquid storage tank (240). The first replenishment pipe (210) is configured to be connected to the liquid storage tank (30), the inlet of the second pressure supply device (230) is connected to the second replenishment pipe (220), the outlet of the second pressure supply device (230) is connected to the first replenishment pipe (210); the second replenishment pipe (220) is connected to the new liquid storage tank (240).

6. The brake fluid bleed system as described in claim 5, characterized in that, When the first pressure supply device (120) and the second pressure supply device (230) are turned on, the second pressure supply device (230) is turned off when the liquid level in the storage tank (30) is higher than or equal to the highest preset liquid level.

7. The brake fluid bleed system as described in claim 6, characterized in that, When the liquid level in the storage tank (30) is lower than the minimum preset liquid level, the second pressure supply device (230) is turned on; the minimum preset liquid level is higher than the minimum normal operating liquid level of the storage tank (30) and lower than the maximum preset liquid level.

8. The brake fluid bleed system as described in claim 4, characterized in that, It also includes a mobile base (300) with wheels; the waste discharge device (100) and the new liquid supply device (200) are mounted on the mobile base (300).

9. The brake fluid bleed system as described in claim 8, characterized in that, The center of gravity of the movable base (300) is located between the new liquid supply device (200) and the waste discharge device (100).

10. The brake fluid bleed system as described in claim 5, characterized in that, It also includes a winding section for receiving the liquid extraction tube (110) and / or the first liquid replenishment tube (210).

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