Hydraulic power assisted dual chamber brake master cylinder

Abstract

The application discloses a hydraulic-assisted double-cavity brake master cylinder and belongs to the technical field of brake pumps. The master cylinder comprises a pump body and two pump units arranged side by side. Each pump unit comprises an oil filling cavity and an assisting cavity separated by an assisting piston, and an assisting cavity and a pressurizing cavity separated by a pressurizing piston. The assisting piston is fixedly connected with the pressurizing piston, and a spring is arranged in the assisting cavity. A cavity with a switch valve assembly is arranged in the assisting piston to control an oil path connecting the oil filling cavity and the assisting cavity. An oil channel with a one-way valve is arranged in the pressurizing piston. The double-cavity parallel structure can output large flow and realize rapid pressure building. During braking, the switch valve assembly is actuated, high-pressure oil from the oil filling cavity enters the assisting cavity, the assisting piston and the pressurizing piston are driven to move, and thus hydraulic assistance is provided, pedal force is significantly reduced, and brake torque is increased, and the master cylinder is particularly suitable for large agricultural machinery.

Description

Technical Field

[0001] This invention relates to the field of brake pump technology, and in particular to a hydraulically assisted dual-chamber brake master pump. Background Technology

[0002] With the continuous development of the agricultural industry, large-scale farm operations are gradually emerging, and agricultural machinery is also trending towards larger sizes, with high-horsepower tractors and harvesters becoming the main selling models. As the machine size increases, the brakes and the required braking force also increase accordingly. To meet these requirements, the cylinder bore and pedal force need to be increased. Therefore, an improved hydraulic power booster pump is needed to meet the demands of large displacement, high braking force, light pedal force, and to solve the problem of braking lag. Summary of the Invention

[0003] The purpose of this invention is to provide a hydraulically assisted dual-chamber brake master cylinder to solve the problems existing in the prior art, realize the hydraulic power assist function, make the pedal light, have a large output, and increase the braking torque.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a hydraulically assisted dual-chamber brake master cylinder, comprising: The pump body is provided with an oil inlet, an oil outlet, and an oil return port. Two pump units are arranged side-by-side and spaced apart within the pump body. Each pump unit includes an oil filling chamber, an assist chamber, and a pressurizing chamber arranged sequentially along a first direction. The oil filling chamber and the assist chamber are separated by an assist piston, and the assist chamber and the pressurizing chamber are separated by a pressurizing piston. The assist piston is slidably engaged with the pump body, and the pressurizing piston is fixedly connected to the assist piston. The oil filling chamber is connected to the oil inlet through a first oblique oil passage, and the assist chamber is connected to the oil return port through a second oblique channel. The oil outlet corresponds one-to-one with the pressurizing chamber, and the pressurizing chamber is connected to the corresponding oil outlet. A second spring is provided inside the assist chamber, with one end of the second spring abutting against the assist chamber and the other end abutting against the assist piston. The booster plug has a first hollow cavity, and the booster plug has an oil inlet channel and an oil replenishment channel. One end of the oil inlet channel is connected to the oil filling chamber and the other end is connected to the first hollow cavity. One end of the oil replenishment channel is connected to the booster chamber and the other end is connected to the first hollow cavity. The pump unit also includes a switching valve assembly, which is used to control the opening and closing of the oil inlet channel and the oil replenishment channel. The pressurizing oil plug is provided with a third axial oil passage, one end of which is connected to the pressurizing chamber and the other end of which is connected to the assisting chamber; a ball-type check valve is provided in the third axial oil passage, which opens when the fluid in the third axial oil passage flows toward the pressurizing chamber and closes when it flows toward the assisting chamber; A pressure relief hole is provided on the cavity wall of the pressurizing chamber near the assisting chamber, and the pressurizing chamber can communicate with the assisting chamber through the pressure relief hole; the end of the pressurizing piston near the assisting chamber is dynamically sealed to the pressurizing chamber through a first sealing ring.

[0005] Preferably, each of the pressurizing chambers has a balance hole on its wall, and the pump body has a balance oil passage. One end of the balance oil passage is connected to one of the balance holes, and the other end is connected to another balance hole. Each balance hole is provided with a balance valve for controlling the opening and closing of the corresponding balance hole. When the pressurizing oil plug moves away from the booster chamber, it can trigger and open the balance valve.

[0006] Preferably, an annular protrusion is fixed on the outer wall of the pressurizing piston for sliding engagement with the inner wall of the pressurizing chamber.

[0007] Preferably, the annular protrusion has a flat surface corresponding to the valve core of the balance valve, and the flat surface is used to slide with the corresponding valve core.

[0008] Preferably, the first direction is the length direction or the width direction of the pump body.

[0009] Preferably, the end of the power-boosting plug near the pressurizing piston is provided with a groove communicating with the power-boosting chamber, and the pressurizing piston is provided with a connecting block corresponding to the groove. The connecting block is locked in the corresponding groove and is fixedly connected to the pressurizing piston. The third axial oil passage communicates with the power-boosting chamber through the groove.

[0010] Preferably, the switching valve assembly includes a connecting push rod, a push rod piston, a switching valve piston rod, and a first spring arranged sequentially along the first direction. The first spring is closer to the assist chamber than the connecting push rod. One end of the connecting push rod extending into the pump body is fixedly connected to the push rod piston, and the push rod piston is fixedly connected to the switching valve piston rod. One end of the first spring abuts against the assist piston, and the other end abuts against the switching valve piston rod. The switching valve piston rod slides in cooperation with the first hollow cavity along the first direction. The switching valve piston rod can simultaneously block the openings of the oil inlet channel and the oil replenishment channel on the cavity wall of the first hollow cavity, block only the opening of the oil inlet channel on the cavity wall of the first hollow cavity, or block only the opening of the oil replenishment channel on the cavity wall of the first hollow cavity. The connecting push rod and the push rod piston slide in cooperation with the pump body along the first direction.

[0011] Preferably, the push rod piston is provided with a first radial oil passage and a first axial oil passage. The first hollow cavity located on the side of the switching valve piston rod near the push rod piston is the right cavity, and the first hollow cavity located on the side of the switching valve piston rod near the first spring is the left cavity. The first axial oil passage communicates with the right cavity through the first radial oil passage. The switching valve piston rod is provided with a second radial oil passage and a second axial oil passage. The second axial oil passage communicates with the right cavity through the second radial oil passage, and the first axial oil passage communicates with the left cavity through the second axial oil passage.

[0012] Preferably, a push rod seat sleeve is provided on the pump body corresponding to the connecting push rod, and the connecting push rod passes through the corresponding push rod seat sleeve and slides in cooperation with the corresponding push rod seat sleeve.

[0013] Preferably, an axial groove is provided on the outer wall of the pressurizing piston, and a limiting bolt is fixed on the pressurizing chamber, wherein the limiting bolt and the axial groove slide in a sliding fit along the axial direction of the pressurizing piston.

[0014] Preferably, the first direction is the length direction or the width direction of the pump body.

[0015] The present invention achieves the following technical effects compared to the prior art: The hydraulically assisted dual-chamber brake master pump of this invention employs a design of two parallel and independently operating pump units. During braking, the assist chamber and pressurizing chamber of both pump units operate simultaneously, resulting in a total output flow rate that is double that of a single-chamber master pump. This larger flow rate allows for faster filling of the brake wheel cylinders, shortening the pressure build-up time of the braking system and effectively solving the problem of sluggish response in traditional large-diameter brake pumps. Simultaneously, the parallel output of the dual chambers provides greater hydraulic pressure and oil volume to the braking system under the same pedal stroke, ultimately translating into a greater braking torque, fully meeting the high braking force requirements of large agricultural machinery. When the driver depresses the brake pedal, the switching valve assembly activates first, cutting off the return oil circuit of the assist chamber and establishing a high-pressure oil circuit. High-pressure oil from the filling chamber enters the first hollow cavity of the assist piston, pushing the assist piston and its fixed pressurizing piston to move rapidly, thus providing hydraulic assistance for the braking process. This significantly reduces the pedal operating force while generating a large braking force, greatly improving the ease of operation and driving comfort. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the hydraulically assisted dual-chamber brake master pump of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the hydraulically assisted dual-chamber brake master pump of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the hydraulically assisted dual-chamber brake master pump of the present invention. Figure 3 ; Figure 4 for Figure 3 CC section view; Figure 5 for Figure 3 DD sectional view; Figure 6 for Figure 3 FF sectional view; Figure 7 for Figure 3 EE sectional view; Figure 8 This is a side view of the hydraulically assisted dual-chamber brake master cylinder of the present invention; Figure 9 for Figure 8 BB section view; Figure 10 This is a side view of the hydraulically assisted dual-chamber brake master cylinder of the present invention; Figure 11 for Figure 10 BB section view; In the diagram: 1. Pump body; 2. Oil inlet; 3. Oil return port; 4. Oil outlet; 5. Limit bolt; 6. Brake light switch pre-drilled hole; 7. First inclined oil passage; 8. Second inclined oil passage; 9. Balance oil passage; 10. Balance valve; 11. Valve core; 12. Filling chamber; 13. Boosting chamber; 14. Pressurizing chamber; 15. Left cavity; 16. Right cavity; 17. Connecting push rod; 18. Push rod piston; 19. Switch valve piston rod; 20. 21. First spring; 22. Power piston; 23. Pressure piston; 24. First sealing ring; 25. Ball check valve; 26. Oil inlet channel; 27. Oil replenishment channel; 28. First radial oil passage; 29. ​​First axial oil passage; 30. Second radial oil passage; 31. Second axial oil passage; 32. Second spring; 33. Glyd ring; 34. Y-ring; 35. O-ring; 36. Shaft seal; 37. Plug; 38. Axial groove. Detailed Implementation

[0018] The technical solutions of the embodiments 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 creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a hydraulically assisted dual-chamber brake master cylinder to solve the problems existing in the prior art, realize the hydraulic power assist function, make the pedal light, have a large output, and increase the braking torque.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 11 As shown, this embodiment provides a hydraulically assisted dual-chamber brake master cylinder, comprising: Pump body 1, which is provided with oil inlet 2, oil outlet 4 and oil return port 3; Two pump units are arranged side-by-side and spaced apart within the pump body 1. Each pump unit includes an oil filling chamber 12, an assist chamber 13, and a pressurizing chamber 14 arranged sequentially along a first direction. The oil filling chamber 12 and the assist chamber 13 are separated by an assist piston 21, and the assist chamber 13 and the pressurizing chamber 14 are separated by a pressurizing piston 22. The assist piston 21 is slidably fitted with the pump body 1, and the pressurizing piston 22 is fixedly connected to the assist piston 21. The oil filling chamber 12 is connected to the oil inlet 2 through a first inclined oil passage 7, and the assist chamber 13 is connected to the oil return port 3 through a second inclined channel. The oil outlet 4 corresponds one-to-one with the pressurizing chamber 14, and the pressurizing chamber 14 is connected to the corresponding oil outlet 4. A second spring 31 is provided inside the assist chamber 13. An annular groove is provided at one end of the assist chamber 13 away from the oil filling chamber 12. One end of the second spring 31 is located in the annular groove and abuts against the assist chamber 13, and the other end abuts against the assist piston 21. The power steering plug has a first hollow cavity, and the power steering plug has an oil inlet channel 25 and an oil replenishment channel 26. One end of the oil inlet channel 25 is connected to the oil filling chamber 12 and the other end is connected to the first hollow cavity. One end of the oil replenishment channel 26 is connected to the power steering chamber 13 and the other end is connected to the first hollow cavity. The pump unit also includes a switching valve assembly, which is used to control the opening and closing of the oil inlet channel 25 and the oil replenishment channel 26. The pressurizing oil plug is provided with a third axial oil passage. One end of the third axial oil passage is connected to the pressurizing chamber 14 and the other end is connected to the assisting chamber 13. A ball-type check valve 24 is provided in the third axial oil passage. When the fluid in the third axial oil passage flows towards the pressurizing chamber 14, the ball-type check valve 24 is opened and when it flows towards the assisting chamber 13, the ball-type check valve 24 is closed. A pressure relief hole is provided on the cavity wall of the pressurizing chamber 14 near the assisting chamber 13, and the pressurizing chamber 14 can communicate with the assisting chamber 13 through the pressure relief hole; the end of the pressurizing piston 22 near the assisting chamber 13 is dynamically sealed to the pressurizing chamber 14 through the first sealing ring 23; a processing hole is provided above the pressure relief hole, which is sealed with a plug 36 during assembly.

[0022] In the optional scheme of this embodiment, it is more preferred that each pressure chamber 14 is provided with a balance hole on its cavity wall, and the pump body 1 is provided with a balance oil passage 9, one end of the balance oil passage 9 is connected to one balance hole and the other end is connected to another balance hole; each balance hole is provided with a balance valve 10 for controlling the opening and closing of the corresponding balance hole; when the pressure plug moves away from the booster chamber 13, it can trigger and open the balance valve 10.

[0023] In an optional embodiment, a more preferred embodiment is provided with an annular protrusion on the outer wall of the pressurizing piston 22 for sliding engagement with the inner wall of the pressurizing chamber 14.

[0024] In an optional embodiment, a preferred embodiment is provided with a flat surface on the annular protrusion corresponding to the valve core 11 of the balance valve 10, the flat surface being used for sliding engagement with the corresponding valve core 11.

[0025] In the optional scheme of this embodiment, a more preferred one is that the end of the power-boosting oil plug near the pressure piston 22 is provided with a groove that communicates with the power-boosting chamber 13, and the pressure piston 22 is provided with a connecting block corresponding to the groove. The connecting block is locked in the corresponding groove and is fixedly connected to the pressure piston 22. The third axial oil passage communicates with the power-boosting chamber 13 through the groove.

[0026] In an optional embodiment, a preferred embodiment includes a connecting push rod 17, a push rod piston 18, a switching valve piston rod 19, and a first spring 20 arranged sequentially along a first direction. The first spring 20 is closer to the assist chamber 13 than the connecting push rod 17. One end of the connecting push rod 17 extending into the pump body 1 is fixedly connected to the push rod piston 18, and the push rod piston 18 is fixedly connected to the switching valve piston rod 19. One end of the first spring 20 abuts against the assist piston 21, and the other end abuts against the switching valve piston rod 19. The switching valve piston rod 19 slides in cooperation with the first hollow cavity along the first direction. The switching valve piston rod 19 can simultaneously block the openings of the oil inlet channel 25 and the oil replenishment channel 26 on the cavity wall of the first hollow cavity, block only the opening of the oil inlet channel 25 on the cavity wall of the first hollow cavity, or block only the opening of the oil replenishment channel 26 on the cavity wall of the first hollow cavity. The connecting push rod 17 and the push rod piston 18 slide in cooperation with the pump body 1 along the first direction.

[0027] In this embodiment, two first sealing grooves are provided on the outer circumference of the piston rod 19 of the switching valve. The first sealing grooves cooperate with the shaft step seal 35 and are used in conjunction with the oil inlet channel 25 and the oil replenishment channel 26 on the circumference of the booster cylinder piston. The main purpose is to use the shaft step seal 35 to seal the opening of the oil inlet channel 25 and / or the oil replenishment channel 26 in the first hollow cavity.

[0028] In the optional embodiments of this example, a preferred embodiment is that the push rod piston 18 is provided with a first radial oil passage 27 and a first axial oil passage 28. The first hollow cavity located on the side of the switch valve piston rod 19 near the push rod piston 18 is the right cavity 16, and the first hollow cavity located on the side of the switch valve piston rod 19 near the first spring 20 is the left cavity 15. The first axial oil passage 28 communicates with the right cavity 16 through the first radial oil passage 27. The switch valve piston rod 19 is provided with a second radial oil passage 29 and a second axial oil passage 30. The second axial oil passage 30 communicates with the right cavity 16 through the second radial oil passage 29, and the first axial oil passage 28 communicates with the left cavity 15 through the second axial oil passage 30.

[0029] In the optional embodiments of this example, a preferred embodiment is that the pump body 1 is provided with a push rod seat sleeve corresponding to the push rod 17, and the push rod 17 passes through the corresponding push rod seat sleeve and slides in cooperation with the corresponding push rod seat sleeve. In this embodiment, the push rod seat sleeve is provided with a second sealing ring groove and a Y-ring groove, and the push rod piston 18 is fitted with a Glyd ring 32 and a Y-ring 33. The Glyd ring 32 is located in the second sealing ring groove, and the Y-ring 33 is located in the second Y-ring groove. The sealing ring groove is fitted with the hole of the Glyd ring 32, and the Y-ring groove is fitted with the Y-ring 33, so as to realize two seals between the push rod seat sleeve and the push rod piston 18; the outer circumference of the push rod seat sleeve is provided with an O-ring groove, which is fitted with the outer circle of the O-ring 34 for sealing.

[0030] In a preferred embodiment, the outer wall of the pressurizing piston 22 is provided with an axial groove 37, and a limiting bolt 5 is fixed on the pressurizing chamber 14. The limiting bolt 5 and the axial groove 37 are slidably engaged along the axial direction of the pressurizing piston 22. The engagement of the limiting bolt 5 and the axial groove 37 prevents the pressurizing piston 22 from rotating circumferentially.

[0031] In the optional schemes of this embodiment, it is more preferred that the first direction is the length direction of the pump body 1; however, in practical applications, it is also possible to choose the width direction of the pump body 1 as the first direction.

[0032] In this embodiment, the pump body 1 has a brake light switch reserved screw hole 6 at the position of the balance valve 10 in the middle of the pressurization chamber 14. The brake light switch reserved screw hole 6 is used to connect the brake light sensor. The brake light switch reserved screw hole 6 is connected to the balance holes on both sides of the pump body 1 (1).

[0033] The specific working principle of the hydraulically assisted dual-chamber brake master cylinder in this embodiment is as follows: (1) In the initial state, the normal 2 MPa high pressure is present at the oil inlet 2, and the shaft on the piston rod 19 of the switching valve is sealed by the step seal 35 to seal the opening of the oil inlet channel 25 on the booster piston 21; (2) When the driver presses the foot pedal, the foot pedal pushes the connecting push rod 17. When the connecting push rod 17 pushes the push rod piston 18, the switch valve piston rod 19 moves forward against the elastic force of the first spring 20. At this time, the oil inlet channel 25 on the power assist piston 21 opens, and the oil source quickly enters the two side filling chambers 12 through the oil inlet 2 and the first inclined oil passage 7, and enters the right cavity 16 through the oil inlet channel 25, pushing the power assist piston 21 forward to achieve hydraulic power assist. (3) When the driver releases the pedal, the piston rod 19 of the switch valve pushes the push rod piston 18 back to the initial position under the action of the first spring 20 and the second spring 31. The oil source in the filling chamber 12 and the right cavity 16 enters the left cavity 15 through the first radial oil passage 27, the first axial oil passage 28, the second radial oil passage 29 and the second axial oil passage 30. The oil in the left cavity 15 enters the booster chamber 13 through the oil replenishment channel 26. When step (2) is repeated again, the oil in the booster chamber 13 enters the pressurization chamber 14 through the third axial oil passage in the pressurization piston 22 and the ball check valve 24. (4) The oil in the pressurization chamber 14 smoothly enters the load end from the oil outlet 4. When the load is full of oil, the oil pressure in the pressurization chamber 14 increases and tends to flow into the booster chamber 13. At this time, the ball check valve 24 in the third axial oil passage automatically closes. After closing, the load needs to be pressurized by the driver until the required braking force of the load is met and the braking effect is met. When pressurization continues, the ball check valve 24 component closes and the volume of the booster chamber 13 decreases. The oil in the booster chamber 13 returns to the oil tank through the second inclined oil passage 8 and the return oil port 3. (5) During operation, the axial groove 37 on the pressurizing piston 22 slides with the limiting bolt 5 to limit the movement and prevent the pressurizing piston 22 from rotating circumferentially, so that the annular protrusion on the other side of the pressurizing piston 22 is milled into a plane to cooperate with the balance valve 10 assembly. (6) When the pressurizing piston 22 moves forward, the outer circle of the pressurizing piston 22 pushes open the valve core 11, so that the pressure in the pressurizing chambers 14 on both sides and the load is balanced.

[0034] (7) When all components such as pistons are retracted and the load pressure is too high, the excess oil in the pressurization chamber 14 flows into the booster chamber 13 through the pressure relief hole, and flows back to the oil tank through the second inclined oil passage 8 and the return oil port 3.

[0035] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A hydraulically assisted dual-chamber brake master cylinder, characterized in that, include: The pump body is provided with an oil inlet, an oil outlet, and an oil return port. Two pump units are arranged side-by-side and spaced apart within the pump body. Each pump unit includes an oil filling chamber, an assist chamber, and a pressurizing chamber arranged sequentially along a first direction. The oil filling chamber and the assist chamber are separated by an assist piston, and the assist chamber and the pressurizing chamber are separated by a pressurizing piston. The assist piston is slidably engaged with the pump body, and the pressurizing piston is fixedly connected to the assist piston. The oil filling chamber is connected to the oil inlet through a first oblique oil passage, and the assist chamber is connected to the oil return port through a second oblique channel. The oil outlet corresponds one-to-one with the pressurizing chamber, and the pressurizing chamber is connected to the corresponding oil outlet. A second spring is provided inside the assist chamber, with one end of the second spring abutting against the assist chamber and the other end abutting against the assist piston. The booster plug has a first hollow cavity, and the booster plug has an oil inlet channel and an oil replenishment channel. One end of the oil inlet channel is connected to the oil filling chamber and the other end is connected to the first hollow cavity. One end of the oil replenishment channel is connected to the booster chamber and the other end is connected to the first hollow cavity. The pump unit also includes a switching valve assembly, which is used to control the opening and closing of the oil inlet channel and the oil replenishment channel. The pressurizing oil plug is provided with a third axial oil passage, one end of which is connected to the pressurizing chamber and the other end of which is connected to the assisting chamber; a ball-type check valve is provided in the third axial oil passage, which opens when the fluid in the third axial oil passage flows toward the pressurizing chamber and closes when it flows toward the assisting chamber; A pressure relief hole is provided on the cavity wall of the pressurizing chamber near the assisting chamber, and the pressurizing chamber can communicate with the assisting chamber through the pressure relief hole; the end of the pressurizing piston near the assisting chamber is dynamically sealed to the pressurizing chamber through a first sealing ring.

2. The hydraulically assisted dual-chamber brake master cylinder according to claim 1, characterized in that: Each of the pressurizing chambers has a balance hole on its wall, and the pump body has a balance oil passage. One end of the balance oil passage is connected to one of the balance holes, and the other end is connected to another balance hole. Each balance hole is equipped with a balance valve for controlling the opening and closing of the corresponding balance hole. When the pressurizing oil plug moves away from the booster chamber, it can trigger and open the balance valve.

3. The hydraulically assisted dual-chamber brake master cylinder according to claim 2, characterized in that: The outer wall of the pressurizing piston is fixed with an annular protrusion for sliding engagement with the inner wall of the pressurizing chamber.

4. The hydraulically assisted dual-chamber brake master cylinder according to claim 3, characterized in that: The annular protrusion has a flat surface corresponding to the valve core of the balance valve, and the flat surface is used to slide with the corresponding valve core.

5. The hydraulically assisted dual-chamber brake master cylinder according to claim 1, characterized in that: The booster plug has a slot communicating with the booster chamber at one end near the pressurizing piston. The pressurizing piston has a connecting block corresponding to the slot. The connecting block is locked in the corresponding slot and is fixedly connected to the pressurizing piston. The third axial oil passage communicates with the booster chamber through the slot.

6. The hydraulically assisted dual-chamber brake master cylinder according to claim 1, characterized in that: The switching valve assembly includes a connecting push rod, a push rod piston, a switching valve piston rod, and a first spring arranged sequentially along the first direction. The first spring is closer to the assist chamber than the connecting push rod. One end of the connecting push rod extending into the pump body is fixedly connected to the push rod piston. The push rod piston is fixedly connected to the switching valve piston rod. One end of the first spring abuts against the assist piston, and the other end abuts against the switching valve piston rod. The switching valve piston rod is slidably engaged with the first hollow cavity along the first direction. The switching valve piston rod can simultaneously block the openings of the oil inlet channel and the oil replenishment channel on the cavity wall of the first hollow cavity, block only the opening of the oil inlet channel on the cavity wall of the first hollow cavity, or block only the opening of the oil replenishment channel on the cavity wall of the first hollow cavity. The connecting push rod and the push rod piston are respectively slidably engaged with the pump body along the first direction.

7. The hydraulically assisted dual-chamber brake master cylinder according to claim 6, characterized in that: The push rod piston is provided with a first radial oil passage and a first axial oil passage. The first hollow cavity located on the side of the switching valve piston rod closer to the push rod piston is the right cavity, and the first hollow cavity located on the side of the switching valve piston rod closer to the first spring is the left cavity. The first axial oil passage communicates with the right cavity through the first radial oil passage. The switching valve piston rod is provided with a second radial oil passage and a second axial oil passage. The second axial oil passage communicates with the right cavity through the second radial oil passage, and the first axial oil passage communicates with the left cavity through the second axial oil passage.

8. The hydraulically assisted dual-chamber brake master cylinder according to claim 6, characterized in that: The pump body is provided with a push rod seat sleeve corresponding to the connecting push rod, and the connecting push rod passes through the corresponding push rod seat sleeve and slides in cooperation with the corresponding push rod seat sleeve.

9. The hydraulically assisted dual-chamber brake master cylinder according to claim 1, characterized in that: An axial groove is provided on the outer side wall of the pressurizing piston, and a limiting bolt is fixed on the pressurizing chamber. The limiting bolt and the axial groove slide in a sliding fit along the axial direction of the pressurizing piston.

10. The hydraulically assisted dual-chamber brake master cylinder according to claim 1, characterized in that: The first direction is the length direction or the width direction of the pump body.

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