Automobile brake master cylinder

Abstract

The invention discloses an automobile brake master pump, which comprises a brake pump assembly, a first piston and a second piston, the brake pump assembly comprises a main cylinder, a first piston and a second piston, the main cylinder is provided with an end A and an end B, the first piston is adjacent to the end A, the second piston is adjacent to the end B, a first sealing chamber is formed between the first piston and the second piston, and a second sealing chamber is formed between the second piston and the first sealing chamber. On one hand, the second sealing chamber is compressed to directly increase the pressure, on the other hand, fluid is supplemented to the first sealing chamber through the liquid inlet pipe, the hydraulic pressure of the first sealing chamber is forcibly increased, pressure loss caused by bubbles can be counteracted through superposition of the two, and it is ensured that the first branch pipe and the second branch pipe output enough braking force to the front and rear wheel calipers; brake failure or lag caused by moisture influence is avoided; the basic thrust applied by the push rod and the additional hydraulic increment generated by the electromagnet form a synergistic effect, and the pressure of the first sealing chamber and the second sealing chamber is remarkably amplified.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile brake technology, in particular to an automobile brake master cylinder. Background Art

[0002] The braking system is not completely sealed. During long-term use, it may absorb moisture from the air through pipe joints, piston seals and other parts. The brake fluid is hygroscopic. Long-term use will lead to an increase in moisture content and a decrease in boiling point. During frequent braking, high temperature may vaporize water to form a large number of bubbles. These bubbles fill the sealed chamber and pipelines. Since gas has good compressibility, these bubbles will occupy a certain volume in the sealed hydraulic system and be compressed under pressure. Unlike incompressible brake fluid, which effectively transmits pressure, this phenomenon is called "air blockage". Its direct consequence is insufficient output pressure, causing the braking force of the front and rear wheels to decay. Summary of the Invention

[0003] The present invention aims to solve the problems existing in the prior art and provides the following technical solutions:

[0004] Automobile brake master cylinder, including:

[0005] A brake pump assembly comprising a master cylinder and a piston 1 and a piston 2 slidably disposed in the master cylinder, the master cylinder having an A end and a B end, the piston 1 being adjacent to the A end, the piston 2 being adjacent to the B end, a sealed chamber 1 being formed between the piston 1 and the piston 2, a sealed chamber 2 being formed between the piston 2 and the inner wall of the master cylinder adjacent to the B end, the sealed chamber 1 and the sealed chamber 2 being filled with hydraulic fluid, a spring 1 being provided in the sealed chamber 1 to act between the piston 1 and the piston 2, a spring 2 being provided in the sealed chamber 2, a push rod being inserted into the piston at the A end of the master cylinder, an end of the push rod extending into the interior of the master cylinder being connected to the piston 1, a branch pipe 1 being provided on both side walls of the master cylinder to communicate with the sealed chamber 1, and a branch pipe 2 being provided on both side walls of the master cylinder to communicate with the sealed chamber 2;

[0006] The power assist assembly includes an integrally formed extension cylinder arranged at the B end of the master cylinder and a movable part arranged between the master cylinder and the extension cylinder. The second spring acts between the second piston and the movable part. An electromagnet is embedded in one end of the inner wall of the extension cylinder away from the master cylinder. A liquid inlet pipe is provided on the side wall of the extension cylinder and is located between one end of the master cylinder and the sealing chamber 1.

[0007] When the electromagnet is energized, it is magnetized, driving the movable part to move toward the master cylinder to compress the sealing chamber 2, and transporting fluid to the sealing chamber 1 through the liquid inlet pipe to increase the fluid pressure in the sealing chamber 1.

[0008] As an improvement of the above technical solution, the movable part includes a movable rod movably arranged between the main cylinder and the extension cylinder, the movable rod is located inside the extension cylinder and is fixedly connected to an iron block at one end, and the movable rod extending into the main cylinder is provided with a movable piston four at one end, the piston four is connected to one end of the spring two, and the surface of the movable rod is located inside the extension cylinder and is fixedly sleeved with a piston three.

[0009] As an improvement to the above technical solution, it further includes an oil replenishing cylinder located above the master cylinder, and a connecting pipe 1 and a connecting pipe 2 which are respectively connected to the sealing chamber 1 and the sealing chamber 2 are provided at the bottom of the oil replenishing cylinder.

[0010] As an improvement to the above technical solution, a connecting pipe is provided between the side wall of the extension cylinder and one end close to the main cylinder and the oil replenishing cylinder, and a one-way valve is provided on both the liquid inlet pipe and the connecting pipe.

[0011] As an improvement to the above technical solution, the following is also included:

[0012] a detection unit, detecting a driver's braking request and outputting a corresponding detection signal;

[0013] A controller is electrically connected to the detection unit and the electromagnet.

[0014] As an improvement of the above technical solution, the detection unit includes a pressure sensor installed on the brake pedal and a speed sensor for detecting the wheel speed. When both the speed sensor and the pressure sensor exceed preset values, the signal is transmitted to the controller, and the controller energizes the electromagnet.

[0015] Beneficial effects of the present invention:

[0016] The electromagnet drives the moving parts to achieve dual pressurization: on the one hand, it compresses the second sealing chamber to directly increase its pressure; on the other hand, it replenishes fluid to the first sealing chamber through the liquid inlet pipe, forcibly increasing the hydraulic pressure of the first sealing chamber. The combination of these two can offset the pressure loss caused by bubbles, ensuring that the first and second branches can output sufficient braking force to the front and rear wheel calipers, avoiding brake failure or lag caused by moisture.

[0017] The basic thrust applied by the push rod and the additional hydraulic pressure increase generated by the electromagnet form a synergistic effect, significantly amplifying the pressure in the sealing chambers one and two. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of the overall structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the present invention when it is in a braking state;

[0020] Figure 3 It is a top view of the master cylinder of the present invention.

[0021] Figure numerals: 10, main cylinder; 11, piston one; 12, spring one; 13, piston two; 14, spring two; 15, extension cylinder; 16, push rod; 17, branch pipe one; 18, branch pipe two; 20, oil replenishing cylinder; 30, electromagnet; 31, liquid inlet pipe; 32, iron block; 33, piston four; 34, movable rod; 35, piston three; 36, connecting pipe. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] The automobile brake master cylinder includes: a brake pump assembly, including a master cylinder 10 and a piston 11 and a piston 2 13 slidably arranged in the master cylinder 10, the master cylinder 10 having an A end and a B end, the piston 1 11 adjacent to the A end, the piston 2 13 adjacent to the B end, a sealed chamber 1 is formed between the piston 1 11 and the piston 2 13, and a sealed chamber 2 is formed between the piston 2 13 and the inner wall of the master cylinder 10 adjacent to the B end, the sealed chamber 1 and the sealed chamber 2 are filled with hydraulic fluid A spring 12 is provided in the sealed chamber 1, acting between the piston 11 and the piston 2 13. A spring 2 14 is provided in the sealed chamber 2. A push rod 16 is inserted into the piston at end A of the master cylinder 10. One end of the push rod 16 that extends into the interior of the master cylinder 10 is connected to the piston 11. Branch pipes 17 communicating with the sealed chamber 1 are provided on both side walls of the master cylinder 10. Branch pipes 2 18 communicating with the sealed chamber 2 are provided on both side walls of the master cylinder 10.

[0024] The power assist assembly includes an integrally formed extension cylinder 15 arranged at the end of the master cylinder 10B and a movable part movable between the master cylinder 10 and the extension cylinder 15. The spring 2 14 acts between the piston 2 13 and the movable part. An electromagnet 30 is embedded in one end of the inner wall of the extension cylinder 15 away from the master cylinder 10. A liquid inlet pipe 31 is provided on the side wall of the extension cylinder 15 and is located between one end of the master cylinder 10 and the sealing chamber 1.

[0025] When the electromagnet 30 is energized, it is magnetized, driving the movable member to move toward the master cylinder 10 to compress the sealing chamber 2, and transporting fluid to the sealing chamber 1 through the liquid inlet pipe 31 to increase the fluid pressure in the sealing chamber 1.

[0026] Specifically, piston 11 and piston 2 13 are in a balanced position under the natural elastic force of spring 12 and spring 2 14. At this time, the hydraulic fluid in sealing chamber 1 and sealing chamber 2 is in a low-pressure equilibrium state. The push rod 16 is not subjected to external force, that is, the driver does not step on the brake pedal, piston 11 is not pushed, branch pipe 17 and branch pipe 2 18 have no pressure output, and therefore the brake caliper is not under pressure. When the driver steps on the brake pedal, the push rod pushes piston 11 forward, causing the pressure in sealing chamber 1 to increase, and piston 11 moves toward end B, compressing the seal. The hydraulic fluid in the sealing chamber 1 is compressed. At the same time, the piston 11 applies a thrust to the piston 2 13 through the spring 12, causing the piston 2 13 to move toward the B end, compressing the hydraulic fluid in the sealing chamber 2. As the pressure in the sealing chamber 1 and the sealing chamber 2 increases, the hydraulic fluid is transmitted to the brake caliper through the branch pipe 1 17 and the branch pipe 2 18 to realize the basic braking function. However, due to the mixing of water into the hydraulic fluid, the hydraulic fluid in the sealing chamber 1 and the sealing chamber 2 generates high temperature due to compression during the braking process. Especially during emergency braking, the pressure rises suddenly and the local temperature can reach above 100°C. If water is mixed in, the boiling point of water is much lower than that of brake fluid, so it will vaporize quickly at high temperature to form bubbles, which will cause the pressure of the sealed chamber 2 and the sealed chamber 1 to fail to increase normally, and the braking force output by the branch pipes 1 and 2 will be insufficient. At this time, the electromagnet 30 can be energized. After the electromagnet 30 is energized, it will be magnetized, generating magnetic force to drive the moving part to move in the direction of the master cylinder 10. When the moving part moves, the spring 2 14 is compressed, which will cause the volume of the sealed chamber 2 to decrease, and the pressure of the hydraulic fluid therein will increase. At the same time, the fluid in the extension cylinder 15 is pushed by the moving part through The liquid inlet pipe 31 is pressed into the sealed chamber 1, which increases the amount of hydraulic fluid in the sealed chamber 1. The increase in the amount of fluid in the sealed chamber 1 causes the hydraulic pressure in the sealed chamber 1 to rise. The hydraulic pressure of the sealed chamber 1 is transmitted to the brake line, i.e., the front wheel brake caliper, through the branch pipe 17. The pressure of the sealed chamber 2 is transmitted to another set of brake lines, i.e., the rear wheel brake caliper, through the branch pipe 2 18, to achieve the braking effect. This is equivalent to the driver applying a basic thrust through the push rod 16 while additionally increasing the pressure of the hydraulic fluid through the electromagnet 30, thereby amplifying the braking force and forming an active boost mechanism.

[0027] In one embodiment, the movable part includes a movable rod 34 that is movable and arranged between the main cylinder 10 and the extension cylinder 15. The movable rod 34 is located at one end inside the extension cylinder 15 and is fixedly connected to an iron block 32. The movable rod 34 is extended to one end inside the main cylinder 10 and is provided with a movable piston four 33. The piston four 33 is connected to one end of the spring two 14. The surface of the movable rod 34 is located inside the extension cylinder 15 and is fixedly sleeved with a piston three 35. After the electromagnet 30 is energized, it is magnetized, and a magnetic repulsion force is generated on the iron block 32 toward one end of the electromagnet 30, driving the movable rod 34 to move in the direction of the main cylinder 10 and overcoming the elastic force of the spring two 14. The movable rod 34 drives the piston three 35 to move synchronously in the extension cylinder 15, compressing the piston three 35 and the extension cylinder 15 is close to the space between the inner walls of the master cylinder 10B end, so that the hydraulic fluid pressure in the space increases, and the fluid is pressed into the sealing chamber one through the liquid inlet pipe 31, directly replenishing the fluid volume of the sealing chamber one, and increasing the pressure of the sealing chamber one through the "incremental pressure replenishment" to ensure the pressure output of the branch pipe 17 to the front wheel caliper. The piston four 33 at the other end of the movable rod 34 moves with the rod, compressing the spring two 14, reducing the space size of the sealing chamber two, so that the pressure of the sealing chamber two increases, and transmitting the pressure to the rear wheel caliper through the branch pipe two 18 to make up for the pressure loss. The magnetic force of the electromagnet 30 is converted into dual power through the linkage action of the movable rod 34: one is to compress the extension cylinder 15 through the piston three 35 to replenish the high-pressure fluid to the sealing chamber one; the other is to compress the sealing chamber two by moving the piston four 33.

[0028] In one embodiment, the oil replenishing cylinder 20 is further included above the master cylinder 10. The bottom of the oil replenishing cylinder 20 is provided with a connecting pipe 1 and a connecting pipe 2 which are respectively connected to the sealed chamber 1 and the sealed chamber 2. The oil replenishing cylinder 20 is essentially a liquid storage container, which stores spare hydraulic fluid inside. The fluid in the sealed chambers 1 and 2 is of the same source. The connecting pipe 1 and the connecting pipe 2 form a "dynamic fluid replenishment-exhaust" passage with the sealed chambers 1 and 2 respectively. When the brake is not applied, the piston 11 and the piston 2 are in an initial equilibrium position. At this time, the connecting pipe 1 is connected to the sealed chamber 1, that is, the piston 1 11 does not block the interface between the connecting pipe 1 and the sealed chamber 1. Similarly, the connecting pipe 2 is located in the uncovered area of ​​the piston 2 13. The oil replenishing cylinder 20 is connected to the sealed chamber 1 and the sealed chamber 2 respectively through the connecting pipe 1 and the connecting pipe 2 to achieve fluid replenishment and pressure balance.

[0029] During braking, piston 1 11 seals connecting pipe 1, and piston 2 13 seals connecting pipe 2. At this time, the passages between sealing chamber 1, sealing chamber 2, and the oil replenishing cylinder 20 are cut off, forming two independent closed chambers. The fluid in sealing chamber 1 can only be output to the brake caliper through branch pipe 1 17, and the fluid in sealing chamber 2 can only be output through branch pipe 2 18, ensuring efficient pressure transmission.

[0030] In one embodiment, a connecting pipe 36 is provided between the side wall of the extension cylinder 15 and the end close to the master cylinder 10 and the oil replenishing cylinder 20. Both the liquid inlet pipe 31 and the connecting pipe 36 are provided with a one-way valve. The one-way valve on the liquid inlet pipe 31 only allows hydraulic fluid to flow from the extension cylinder 15 to the sealing chamber 1, and prevents the high-pressure fluid in the sealing chamber 1 from flowing back into the extension cylinder.

[0031] The one-way valve on the connecting pipe 36 only allows the hydraulic fluid to flow from the oil replenishing cylinder 20 to the extension cylinder 15, and prevents the fluid in the extension cylinder 15 from flowing back into the oil replenishing cylinder 20. When the electromagnet 30 is energized (power-assisted braking state), the electromagnet 30 drives the movable rod 34 to move toward the master cylinder 10 through the iron block 32. The space between the inner wall of the extension cylinder 15 near the B end and the piston 3 35 decreases, and the pressure increases, exceeding the pressure in the sealing chamber 1. At this time, the one-way valve on the liquid inlet pipe 31 is opened because the "extension cylinder 15 pressure > sealing chamber 1 pressure". The fluid in the extension cylinder 15 is pressed into the sealed chamber 1 through the liquid inlet pipe 31 to achieve power boosting. When the electromagnet 30 is powered off, the moving part is reset under the action of the spring 2 14. The space between the inner wall of the extension cylinder 15 near the B end and the piston 3 35 increases, so the pressure decreases. The one-way valve of the connecting pipe 36 is turned on, and the oil replenishing cylinder 20 replenishes oil to the extension cylinder 15 through the connecting pipe 36 to prepare for the next power boosting. The connecting pipe 36 and the oil replenishing cylinder form the "fluid replenishing channel" of the extension cylinder 15, and the liquid inlet pipe 31 and the sealed chamber 1 form the "boosting channel".

[0032] In one embodiment, it further includes:

[0033] a detection unit, detecting a driver's braking request and outputting a corresponding detection signal;

[0034] A controller is electrically connected to the detection unit and the electromagnet 30 .

[0035] In one embodiment, the detection unit includes a pressure sensor installed on the brake pedal and a speed sensor for detecting the wheel speed. When both the speed sensor and the pressure sensor exceed preset values, the signal is transmitted to the controller, and the controller energizes the electromagnet 30.

[0036] The pressure sensor detects the force applied by the driver's pedal. Only when the pressure sensor reading exceeds a preset pedal value and the speed sensor reading exceeds a preset vehicle speed value is it assumed that the driver is performing high-intensity or emergency braking, requiring additional assistance. The detection unit then outputs a "assistance required" signal to the controller. The controller issues a command, energizing electromagnet 30 and magnetizing it. Magnetic repulsion drives the moving element toward master cylinder 10. This moving element further compresses sealed chamber 2 via piston 4 33, increasing the pressure within it. Branch pipe 2 outputs a higher pressure, increasing the braking force of the rear wheel calipers. Simultaneously, fluid is injected into sealed chamber 1, increasing the pressure within it. Branch pipe 17 also increases the front wheel braking force due to the increased pressure. After the brake pedal is released, if the pressure sensor reading falls below a preset value or the speed sensor reading falls below a preset vehicle speed value, the controller issues a command, de-energizing electromagnet 30. Spring 2 14 resets the moving element, returning the system to the base braking state. The oil replenishment cylinder replenishes oil to extension cylinder 15 via connecting pipe 36, ensuring smooth assistance during the next braking phase.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. Automobile brake master cylinder, characterized in that: include: A brake pump assembly comprises a master cylinder (10) and a piston 1 (11) and a piston 2 (13) slidably arranged in the master cylinder (10), wherein the master cylinder (10) has an A end and a B end, wherein the piston 1 (11) is adjacent to the A end, and the piston 2 (13) is adjacent to the B end, and a sealing chamber 1 is formed between the piston 1 (11) and the piston 2 (13), and a sealing chamber 2 is formed between the piston 2 (13) and the inner wall of the master cylinder (10) adjacent to the B end, wherein the sealing chamber 1 and the sealing chamber 2 are filled with hydraulic fluid, and the sealing chamber 1 A spring (12) is provided inside the master cylinder (10) to act between the piston (11) and the piston (13), a spring (14) is provided inside the sealing chamber (13), a push rod (16) is inserted into the piston at the A end of the master cylinder (10), and one end of the push rod (16) that extends into the interior of the master cylinder (10) is connected to the piston (11), a branch pipe (17) communicating with the sealing chamber (1) is provided on both side walls of the master cylinder (10), and a branch pipe (18) communicating with the sealing chamber (2) is provided on both side walls of the master cylinder (10); The power assist assembly comprises an integrally formed extension cylinder (15) arranged at the B end of the master cylinder (10) and a movable part arranged between the master cylinder (10) and the extension cylinder (15); the second spring (14) acts between the second piston (13) and the movable part; an electromagnet (30) is embedded in one end of the inner wall of the extension cylinder (15) away from the master cylinder (10); and a liquid inlet pipe (31) is provided on the side wall of the extension cylinder (15) and is located between one end of the master cylinder (10) and the first sealing chamber. When the electromagnet (30) is energized, it is magnetized, driving the movable member to move toward the master cylinder (10) to compress the sealing chamber 2, and transporting fluid to the sealing chamber 1 through the liquid inlet pipe (31) to increase the fluid pressure in the sealing chamber 1.

2. The automobile brake master cylinder according to claim 1, characterized in that: The movable member includes a movable rod (34) movably arranged between the main cylinder (10) and the extension cylinder (15); one end of the movable rod (34) located inside the extension cylinder (15) is fixedly connected to an iron block (32); one end of the movable rod (34) extending to the inside of the main cylinder (10) is provided with a movable piston four (33); the piston four (33) is connected to one end of the spring two (14); and the surface of the movable rod (34) is located inside the extension cylinder (15) and is fixedly sleeved with a piston three (35).

3. The automobile brake master cylinder according to claim 2, characterized in that: It also includes an oil replenishing cylinder (20) located above the master cylinder (10), and a connecting pipe 1 and a connecting pipe 2 are provided at the bottom of the oil replenishing cylinder (20), which are respectively connected to the sealing chamber 1 and the sealing chamber 2.

4. The automobile brake master cylinder according to claim 3, characterized in that: A connecting pipe (36) is provided between the side wall of the extension cylinder (15) and one end close to the main cylinder (10) and the oil replenishing cylinder (20), and a one-way valve is provided on both the liquid inlet pipe (31) and the connecting pipe (36).

5. The automobile brake master cylinder according to claim 1, characterized in that: Also includes: a detection unit, detecting a driver's braking request and outputting a corresponding detection signal; A controller is electrically connected to the detection unit and the electromagnet (30).

6. The automobile brake master cylinder according to claim 5, characterized in that: The detection unit includes a pressure sensor mounted on a brake pedal and a speed sensor for detecting wheel speed. When both the speed sensor and the pressure sensor exceed preset values, the signal is transmitted to the controller, and the controller energizes the electromagnet (30).

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