A dual-piston pressure brake pump

Abstract

The utility model relates to a kind of double-plunger pressurized brake pump, which is nested with big plunger sleeve, small plunger in brake pump shell;When driving small plunger movement, small plunger, big plunger sleeve move simultaneously, and quickly pump oil for brake, so that brake quickly moves to position, and realizes the quick response of brake action;When brake moves to position, big plunger sleeve automatically stops movement, and small plunger continues to move, and secondary pressurization is carried out for brake, so as to improve the braking force of brake;The double-plunger pressurized brake pump does not need to set up additional hydraulic pump to supply oil when working, and can independently complete the oil pumping work for brake, so as to greatly reduce the cost of tractor or other motor vehicles;In addition, the secondary pressurization of the double-plunger pressurized brake pump for brake also greatly improves the braking force of brake, so as to ensure the braking safety of tractor or other large motor vehicles.

Description

Technical Field

[0001] This invention relates to the field of brake pump technology for tractors or other large motor vehicles, and specifically to a dual-plunger booster brake pump. Background Technology

[0002] Currently, most power pumps used for braking in tractors or other large motor vehicles on the market are power-assisted brake pumps with external hydraulic power sources. This requires a separate hydraulic pump to supply oil to the power-assisted brake pump, which increases the cost of tractors or other large motor vehicles. In addition, when there is no power, the oil supply hydraulic pump stops working, and the power-assisted brake pump will have insufficient braking force due to the low output oil pressure, thus affecting the braking safety of tractors or other large motor vehicles.

[0003] If an independent plunger pump without external oil supply is used as the power pump for braking tractors or other large motor vehicles, a problem arises: to ensure the braking response speed of tractors or other large motor vehicles, the plunger pump plunger needs to have a larger diameter to ensure sufficient brake fluid is supplied to the brakes within a short plunger stroke; however, a larger plunger diameter results in lower brake fluid pressure under a given brake pedal pressure, leading to insufficient braking force and affecting the braking safety of tractors or other large motor vehicles. If a smaller diameter plunger is used to increase brake fluid pressure, the plunger stroke during braking will increase, reducing the braking response speed of tractors or other large motor vehicles. Therefore, when using an independent plunger pump as the power pump for braking tractors or other large motor vehicles, braking response speed and braking safety become an irreconcilable contradiction. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention discloses a dual-plunger booster brake pump. The pump housing contains a large plunger sleeve, within which a small plunger is nested. When the foot pedal drives the small plunger, both the small and large plunger sleeves move simultaneously, rapidly pumping oil into the brake and enabling it to quickly reach its position, thus achieving a rapid braking response. Once the brake has reached its position, the large plunger sleeve automatically stops moving, while the small plunger continues to move, providing a secondary boost to the brake, thereby increasing the final braking force.

[0005] To achieve the aforementioned objective, the present invention employs the following technical solution: a dual-plunger booster brake pump, comprising a housing; the housing has a housing cavity, a tank connection port is provided at the left end of the housing cavity, and a brake oil outlet and a booster port are provided on the side wall of the housing cavity; a one-way valve for the brake oil outlet is provided at the brake oil outlet; when the dual-plunger booster brake pump is working, the tank connection port is connected to a reservoir via a pipeline, the reservoir storing brake oil to compensate for brake oil loss caused by leakage during operation of the dual-plunger booster brake pump and the brake; the brake oil outlet and the booster port are connected to the brake via pipelines, for pumping brake oil into the brake by the dual-plunger booster brake pump during braking; a large plunger sleeve is movably disposed in the housing cavity, the left end of the large plunger sleeve being connected to the housing cavity. The left end forms an oil filling chamber A, which is connected to the oil tank connection port through a follower check valve A and to the brake oil outlet through a brake oil port check valve. The outer circumference of the large plunger sleeve has an outer annular groove, which is connected to the booster port. A large plunger sleeve cavity is located in the middle of the large plunger sleeve, with an end oil hole at the left end of the cavity. Several radial oil holes are evenly distributed on the sidewalls of the cavity. A small plunger is movably installed within the cavity, with its right end extending to the outside of the cavity. The left end of the small plunger and the left end of the large plunger sleeve cavity form a booster chamber B, which is connected to the end oil hole of the large plunger sleeve through a follower check valve B and to the booster port through the radial oil holes of the large plunger sleeve.

[0006] See the instruction manual appendix Figure 12 In the unbraked state (original state), the follow-up check valve A is open, and the oil filling chamber A is connected to the oil tank connection port; the brake oil port check valve is closed, and the oil filling chamber A is shut off from the brake oil outlet; the follow-up check valve B is open, and the booster chamber B is connected to the oil filling chamber A; the booster chamber B is connected to the booster port through the radial oil hole of the large plunger sleeve and the outer annular groove of the large plunger sleeve.

[0007] See the instruction manual appendix Figure 13 , 14When a tractor or other large motor vehicle brakes, pressing the brake pedal pushes the right end of the small plunger, causing it to move to the left. The small plunger then moves the follower check valve B to the left, blocking the oil hole at the end of the large plunger sleeve. At this time, the brake fluid pressure in the booster chamber B increases. The brake fluid in the booster chamber B, after being attenuated by the radial oil hole of the large plunger sleeve, then enters the brake through the outer annular groove of the large plunger sleeve and the booster port. Simultaneously, the brake fluid in the booster chamber B pushes the large plunger sleeve to the left, causing the large plunger sleeve to move the follower check valve A to the left. The follower check valve A blocks the oil tank connection port at the left end of the housing cavity. At this time, the brake fluid pressure in the filling chamber A increases slightly. When the brake fluid pressure delivered to the brake from the booster chamber B is greater than the brake fluid pressure (the brake fluid pressure in the booster chamber B is attenuated by the radial oil hole of the large plunger sleeve), the brake fluid port check valve opens under the action of the brake fluid pressure in the injection chamber A, and the brake fluid in the injection chamber A enters the brake through the brake fluid outlet. During this stage, the large plunger sleeve and the small plunger of the dual-plunger booster brake pump pump oil to the brake simultaneously. However, since the diameter of the radial oil hole of the large plunger sleeve is small, the large plunger sleeve is actually the main pump for the brake. Therefore, the dual-plunger booster brake pump pumps oil to the brake at a relatively high speed during this stage, and the movement stroke of the large plunger sleeve is relatively small, which can quickly drive the brake to the desired position, ensuring the braking response speed of tractors or other large motor vehicles.

[0008] Once the brakes are in position, due to the incompressibility of the brake fluid, the flow rate of brake fluid pumped into the brakes by the large plunger sleeve and small plunger rapidly decreases. The brake fluid pressure in injection chamber A becomes equal to that at the brake fluid outlet. Therefore, the one-way valve at the brake fluid port automatically resets under the action of the spring, and the large plunger sleeve automatically stops pumping fluid into the brakes. However, the small plunger continues to exert force on the brake fluid in the booster chamber B under the action of the brake pedal. Because the small plunger has a smaller diameter, the brake fluid pressure in booster chamber B rapidly increases, forming high-pressure brake fluid. Due to the incompressibility of the brake fluid, the flow rate of brake fluid from booster chamber B into the brakes is extremely small. Therefore, the high-pressure brake fluid in booster chamber B is transmitted to the brakes with almost no pressure reduction, creating secondary boosting in the brakes, thereby increasing and ensuring the final braking force of the brakes.

[0009] Preferably, the booster port is connected to the rear end of the brake port check valve through the booster oil passage in the housing; the booster oil passage is set in the housing, replacing the original pipeline connecting the booster port and the brake, thus reducing the pipeline connection during actual use of the dual-plunger booster brake pump, making the dual-plunger booster brake pump more convenient to use and assemble.

[0010] Furthermore, the follower check valve A is elastically connected to the large plunger sleeve via the follower spring A; the follower check valve B is elastically connected to the small plunger via the follower spring B; the follower spring A or the follower spring B enables the follower check valve A or the follower check valve B to move synchronously with the large plunger sleeve or the small plunger when it is not closed; when the follower check valve A or the follower check valve B is closed, the large plunger sleeve or the small plunger can continue to move without being affected by the follower check valve A or the follower check valve B.

[0011] Furthermore, a follower check valve chamber A is provided on the left end face of the housing cavity, and the follower check valve A is movably disposed in the follower check valve chamber A; a follower check valve chamber B is provided on the left end face of the large plunger sleeve cavity, and the follower check valve B is movably disposed in the follower check valve chamber B; the follower check valve chamber A or the follower check valve chamber B is used to limit the radial movement of the follower check valve A or the follower check valve B in the housing cavity or the large plunger sleeve cavity, so as to ensure the reliability of the closing action of the follower check valve A or the follower check valve B.

[0012] Preferably, a guide hole for a follower check valve A is provided on the left end face of the housing cavity. The follower check valve A is provided with a guide rod, which is slidably disposed in the guide hole of the follower check valve A. A follower check valve B is provided with a guide rod, which is slidably disposed in the oil hole at the end of the large plunger sleeve. The guide hole of the follower check valve A and the oil hole at the end of the large plunger sleeve are quincunx holes. The quincunx holes are a plurality of oil passage holes evenly distributed around the base hole and communicating with the base hole. The base hole cooperates with the guide rod of the follower check valve A or the follower check valve B to limit the radial movement of the follower check valve A or the follower check valve B in the housing cavity or the large plunger sleeve cavity, ensuring the reliability of the closing action of the follower check valve A or the follower check valve B. The oil passage holes around the base hole are used to ensure that the oil filling chamber A and the oil tank connection port or the pressurization chamber B and the oil filling chamber A are in a communication state when the follower check valve A or the follower check valve B is in the open state.

[0013] Furthermore, a sealing gasket for follower check valve A is fixedly installed on follower check valve A; a sealing gasket for follower check valve B is fixedly installed on follower check valve B; the sealing gasket for follower check valve A or the sealing gasket for follower check valve B is made of rubber with good elasticity, in order to ensure the reliability of the closure of follower check valve A or follower check valve B.

[0014] Furthermore, a large plunger sleeve return spring is provided between the left end face of the large plunger sleeve and the left end face of the housing cavity to reliably reset the large plunger sleeve of the dual-plunger booster brake pump in the unbraked state; a small plunger return spring is provided on the left side of the small plunger to reliably reset the small plunger of the dual-plunger booster brake pump in the unbraked state.

[0015] Furthermore, sealing rings are provided on the outer circumference of both the large plunger sleeve and the small plunger.

[0016] Furthermore, a small plunger retaining ring groove is provided on the inner circumferential surface of the large plunger sleeve cavity near the right opening end, and a small plunger retaining ring is provided in the small plunger retaining ring groove. The small plunger retaining ring cooperates with the small plunger shoulder to prevent the small plunger from coming out of the large plunger sleeve cavity; a large plunger sleeve baffle is fixedly provided on the right end face of the housing to prevent the large plunger sleeve from coming out of the housing cavity.

[0017] Due to the adoption of the technical solution described above, the present invention has the following beneficial effects: The present invention discloses a dual-plunger booster brake pump, which has a large plunger sleeve and a small plunger nested in the brake pump housing; when the small plunger is driven to move, the small plunger and the large plunger sleeve move simultaneously, rapidly pumping oil to the brake, enabling the brake to move quickly into position and achieving a rapid braking response; when the brake moves into position, the large plunger sleeve automatically stops moving, while the small plunger continues to move, providing secondary booster pressure to the brake, thereby improving the braking force of the brake; the dual-plunger booster brake pump does not require a separate hydraulic pump to supply oil during operation and can independently complete the oil pumping work for the brake, thus greatly reducing the cost of tractors or other motor vehicles; in addition, the secondary booster pressure of the brake by the dual-plunger booster brake pump also greatly improves the braking force of the brake, thereby ensuring the braking safety of tractors or other large motor vehicles; furthermore, the dual-plunger booster brake pump can automatically compensate for brake oil leakage during operation, ensuring the reliability of the booster brake pump. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the dual-plunger booster brake pump structure in Example 1;

[0019] Figure 2 This is a schematic diagram of the shell structure in Embodiment 1;

[0020] Figure 3 This is a schematic diagram of a plunger sleeve structure in Example 1;

[0021] Figure 4 This is a schematic diagram of the small plunger structure in Example 1;

[0022] Figure 5 This is a schematic diagram of the dual-plunger assembly structure in Example 1;

[0023] Figure 6 This is a schematic diagram of the dual-plunger booster brake pump structure in Example 2;

[0024] Figure 7 This is a schematic diagram of the shell structure in Example 2;

[0025] Figure 8 This is a schematic diagram of the dual-plunger booster brake pump structure in Example 3;

[0026] Figure 9 This is a schematic diagram of the shell structure in Example 3;

[0027] Figure 10 This is a schematic diagram of the three plunger sleeve structures in the embodiment;

[0028] Figure 11 This is a schematic diagram of the dual-plunger assembly structure in Example 3;

[0029] Figure 12 A schematic diagram of the original state of a dual-plunger booster brake pump;

[0030] Figure 13 Schematic diagram of the movement state of the dual-plunger booster brake pump Figure 1 ;

[0031] Figure 14 Schematic diagram of the movement state of the dual-plunger booster brake pump Figure 2 ;

[0032] Figure 15 This is a frontal schematic diagram of the guide hole shape of the follow-up check valve A in the housing.

[0033] In the diagram: 1. Housing; 1.1. Housing cavity; 1.2. Follower check valve cavity A; 1.3. Oil tank connection port; 1.4. Boost oil port; 1.5. Brake oil outlet; 1.6. Boost oil passage; 1.7. Guide hole for follower check valve A; 2. Large plunger sleeve; 2.1. Large plunger sleeve cavity; 2.2. Follower check valve cavity B; 2.3. Follower spring connector for large plunger sleeve; 2.4. Oil hole at the end of large plunger sleeve; 2.5. Outer annular groove of large plunger sleeve; 2.6. Radial oil hole of large plunger sleeve; 2.7. Sealing ring groove of large plunger sleeve; 2.8. Retaining ring groove of small plunger; 2 9. Set screw hole; 3. Small plunger; 3.1. Small plunger sealing ring groove; 3.2. Small plunger sleeve follower spring connector; 3.3. Small plunger shoulder; 4. Follower check valve B; 4.1. Follower check valve B sealing gasket; 5. Follower spring B; 6. Follower check valve A; 6.1. Follower check valve A sealing gasket; 7. Follower spring A; 8. Large plunger sleeve return spring; 9. Brake oil port check valve; 10. Large plunger sleeve baffle; 11. Small plunger retaining ring; 12. Small plunger return spring; 13. Small plunger cap; 14. Plug; 15. Brake oil port connector. Implementation

[0034] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. Example

[0035] See the instruction manual appendix Figure 1 , 2 3, 4, 5: A dual-plunger booster brake pump, comprising a housing 1, a large plunger sleeve 2, and a small plunger 3;

[0036] The housing 1 has a housing cavity 1.1. The inner side of the left end of the housing cavity 1.1 is provided with a follower check valve cavity A1.2, and the outer side is provided with an oil tank connection port 1.3. The follower check valve cavity A1.2 and the oil tank connection port 1.3 are connected by a round hole. The side wall of the housing cavity 1.1 near the left end is provided with a brake oil outlet 1.5, and the middle section of the side wall is provided with a booster oil port 1.4. The brake oil outlet 1.5 is provided with a brake oil port check valve 9 and a brake oil port connector 15.

[0037] The large plunger sleeve 2 has a large plunger sleeve cavity 2.1 in the middle. A follower check valve cavity B2.2 is located on the inner side of the left end of the large plunger sleeve cavity 2.1, and a large plunger sleeve follower spring connector 2.3 is located on the outer side. A through-hole 2.4, a circular oil hole, is located in the middle of the large plunger sleeve follower spring connector 2.3. The outer circumference of the large plunger sleeve 2 has an outer annular groove 2.5. The sidewall of the large plunger sleeve cavity 2.1... Four radial oil holes 2.6 of the large plunger sleeve are evenly distributed near the follower one-way valve cavity B2.2. The large plunger sleeve cavity 2.1 and the outer ring groove 2.5 of the large plunger sleeve are connected through the radial oil holes 2.6 of the large plunger sleeve. The large plunger sleeve 2 has a large plunger sleeve sealing ring groove 2.7 on the outer circumference near the right end. The large plunger sleeve cavity 2.1 has a small plunger retaining ring groove 2.8 near the right end. Four set screw holes 2.9 are evenly distributed at the bottom of the small plunger retaining ring groove 2.8.

[0038] The small plunger 3 has a small plunger sleeve follower spring connector 3.2 on its left end face, a small plunger sealing ring groove 3.1 on the outer circumference of the small plunger 3 near the left end, and a small plunger shoulder 3.3 on the right side of the small plunger sealing ring groove 3.1.

[0039] The large plunger sleeve 2 is movably disposed in the housing cavity 1.1. The left end of the large plunger sleeve 2 and the left end of the housing cavity 1.1 form the oil injection chamber A. The left end of the large plunger sleeve 2 is elastically connected to the follower check valve A6 through the follower spring A7. The follower check valve A6 is movably disposed in the follower check valve cavity A1.2. A large plunger sleeve return spring 8 is abutting between the left end face of the large plunger sleeve 2 and the left end face of the housing cavity 1.1. In the unbraked state, the large plunger sleeve 2 is in its original position under the action of the large plunger sleeve return spring 8, and the follower check valve A6 is in the open state. The position of the outer ring groove 2.5 of the large plunger sleeve corresponds to the position of the booster oil port 1.4; a Y-type sealing ring is provided in the sealing ring groove 2.7 of the large plunger sleeve; a small plunger retaining ring 11 is provided in the small plunger retaining ring groove 2.8, and a set screw is provided in the set screw hole 2.9. The set screw presses the small plunger retaining ring 11, and the small plunger retaining ring 11 cooperates with the small plunger shoulder 3.3 to prevent the small plunger 3 from coming out of the large plunger sleeve cavity 2.1; a large plunger sleeve baffle 10 is fixed to the right end face of the housing 1 by bolts to prevent the large plunger sleeve 2 from coming out of the housing cavity 1.1.

[0040] The small plunger 3 is movably disposed in the large plunger sleeve cavity 2.1. The left end of the small plunger 3 and the left end of the large plunger sleeve cavity 2.1 form a pressurizing cavity B. The left end of the small plunger 3 is elastically connected to a follower check valve B4 through a follower spring B5. The follower check valve B4 is movably disposed in the follower check valve cavity B2.2. The right end of the small plunger 3 is fixed with a small plunger end cap by threads. The small plunger return spring 12 is abutting between the small plunger end cap and the right end face of the large plunger sleeve 2. A Y-shaped sealing ring is disposed in the small plunger sealing ring groove 3.1.

[0041] A follower check valve A6 is fixedly equipped with a follower check valve A sealing gasket 6.1; a follower check valve B4 is fixedly equipped with a follower check valve B sealing gasket 4.1; a follower spring connector is provided on the right end face of the follower check valve A6, and a spiral groove is provided on the outer circumferential surface of the follower spring connector. One end of the follower spring A7 is rotatably and fixedly connected to the follower spring connector of the follower check valve A6 through the spiral groove; the fixed connection method between the follower check valve B4 and the follower spring B5 is the same as the fixed connection method between the follower check valve A6 and the follower spring A7;

[0042] The outer circumferential surface of the large plunger sleeve follower spring connector 2.3 is provided with a spiral groove, and one end of the follower spring A7 is rotatably and fixedly connected to the large plunger sleeve follower spring connector 2.3 through the spiral groove; the fixed connection method between the small plunger sleeve follower spring connector 3.2 and the follower spring B5 is the same as the fixed connection method between the large plunger sleeve follower spring connector 2.3 and the follower spring A7. Example

[0043] See the instruction manual appendix Figure 6 , 7 In this embodiment, a booster oil passage 1.6 is provided on the housing 1, and the booster oil port 1.4 is connected to the rear end of the brake oil port check valve 9 through the booster oil passage 1.6. Example

[0044] See the instruction manual appendix Figure 8 , 9 10, 11: In this embodiment, the follower-up check valve chamber A1.2 is removed from the housing 1. Simultaneously, the circular hole connecting the original follower-up check valve chamber A1.2 and the oil tank connection port 1.3 is modified into a follower-up check valve A guide hole 1.7. The follower-up check valve A guide hole 1.7 is a perforated hole, and its cross-sectional shape is shown in the appendix to the specification. Figure 15 The follower check valve A6 is provided with a guide rod, which is slidably disposed in the guide hole 1.7 of the follower check valve A6; in addition, the oil hole 2.4 at the end of the large plunger sleeve is modified from the round hole in Embodiment 1 to a plum blossom hole, and the follower check valve B4 is provided with a guide rod, which is slidably disposed in the oil hole 2.4 at the end of the large plunger sleeve.

[0045] The following uses the structure of Embodiment 1 as an example to specifically illustrate the working process of the dual-plunger booster brake pump:

[0046] See the instruction manual appendix Figure 12 The dual-plunger booster brake pump has its tank connection port 1.3 connected to a reservoir via a pipeline, which stores brake fluid. Brake fluid outlet 1.5 and booster port 1.4 are connected to the brake via pipelines, allowing the dual-plunger booster brake pump to pump brake fluid into the brake during braking. In the non-braking state (original state), the follow-up check valve A6 is open, connecting the filling chamber A to the tank connection port; the brake fluid port check valve 9 is closed, shutting off the filling chamber A from the brake fluid outlet 1.5; the follow-up check valve B4 is open, connecting the booster chamber B to the filling chamber A; the booster chamber B is connected to the booster port 1.4 via the radial oil hole 2.6 of the large plunger sleeve and the outer annular groove 2.5 of the large plunger sleeve.

[0047] See the instruction manual appendix Figure 13 , 14 When a tractor or other large motor vehicle brakes, pressing the brake pedal pushes the right end of the small plunger 3, causing it to move to the left. The small plunger 3 then moves the follower check valve B4 to the left, blocking the oil hole 2.4 at the end of the large plunger sleeve. At this time, the brake fluid pressure in the booster chamber B increases. The brake fluid in the booster chamber B, after being attenuated by the radial oil hole 2.4 of the large plunger sleeve, enters the brake system through the outer annular groove 2.5 and the booster port 1.4. Simultaneously, the brake fluid in the booster chamber B pushes the large plunger sleeve 2 to the left, causing the follower check valve A6 to move to the left. The follower check valve A6 blocks the oil tank connection port 1.3 at the left end of the housing cavity. At this time, the brake fluid pressure in the filling chamber A increases, and the brake fluid in the filling chamber A... The brake fluid pressure is slightly higher than the brake fluid pressure delivered to the brake by the booster chamber B (the brake fluid pressure in the booster chamber B is attenuated by the radial oil hole of the large plunger sleeve). The brake fluid port check valve 9 opens under the action of the brake fluid pressure in the injection chamber A, and the brake fluid in the injection chamber A enters the brake through the brake fluid outlet 1.5. At this stage, the large plunger sleeve 2 and the small plunger 3 of the dual-plunger booster brake pump pump oil for the brake at the same time. However, since the diameter of the radial oil hole 2.6 of the large plunger sleeve is small, the large plunger sleeve 2 is actually the main pump for the brake. Therefore, the dual-plunger booster brake pump pumps oil to the brake at a relatively high speed at this stage, and the movement stroke of the large plunger sleeve 2 is relatively small, which can quickly drive the brake to act and ensure the braking response speed of the tractor or other large motor vehicles.

[0048] Once the brakes are in position, due to the incompressibility of the brake fluid, the flow rate of brake fluid pumped into the brakes by the large plunger sleeve 2 and the small plunger 3 decreases rapidly. The brake fluid pressure in the injection chamber A becomes equal to the brake fluid pressure at the brake fluid outlet 1.5. Therefore, the brake fluid port check valve 9 automatically resets under the action of the spring, and the large plunger sleeve 2 stops pumping fluid into the brakes. However, the small plunger 3 continues to exert force on the brake fluid in the pressure boosting chamber B under the action of the brake pedal. Because the small plunger 3 has a small diameter, the brake fluid pressure in the pressure boosting chamber B increases rapidly, forming high-pressure brake fluid. Due to the incompressibility of the brake fluid, the flow rate of brake fluid from the pressure boosting chamber B into the brakes is extremely small. Therefore, the pressure of the high-pressure brake fluid in the pressure boosting chamber B is transmitted to the brakes with almost no attenuation, providing secondary pressure boosting to the brake fluid in the brakes. This greatly increases the brake fluid pressure in the brakes, thereby improving and ensuring the final braking force of the brakes.

[0049] When braking ends and the brake pedal releases its force on the small plunger 3, the pressure boosting effect of the small plunger 3 quickly disappears, and the pressure of the brake fluid in the brake system drops rapidly, releasing the brake. Under the action of the brake return spring, the brake fluid in the brake system flows back to the boosting chamber B through the boosting port 1.4. At the same time, the small plunger 3 moves to the right under the pressure of the returning brake fluid and the action of the small plunger return spring 12, and the follow-up one-way valve B4 opens. The brake fluid in the boosting chamber B enters the filling chamber A through the oil hole 2.4 at the end of the large plunger sleeve. Under the combined action of the pressure of the returning brake fluid and the large plunger sleeve return spring 8, the follow-up one-way valve A6 opens. At this time, the brake fluid in the brake system continuously flows back to the boosting chamber B and the filling chamber A of the dual-plunger booster brake pump under the action of the brake return spring until the brake system completely returns to its original state.

[0050] If there is a leak in the dual-plunger booster brake pump or brake during operation, after the brake has completely returned to its original state, the large plunger sleeve 2 or the small plunger 3 will not actually return to its original position. Under the action of the return spring, the large plunger sleeve 2 or the small plunger 3 will continue to move to the right. At this time, the brake fluid stored in the reservoir will enter the dual-plunger booster brake pump through the reservoir connection port 1.3 to compensate for the brake fluid leaked by the dual-plunger booster brake pump or brake during operation.

[0051] The parts of this invention not described in detail are prior art.

Claims

1. A dual-plunger booster brake pump, characterized in that: Includes a housing (1), which has a housing cavity (1.1); a large plunger sleeve (2) is provided in the housing cavity (1.1), and a small plunger (3) is nested inside the large plunger sleeve (2); when braking, the small plunger (3) is driven to move. First, the small plunger (3) and the large plunger sleeve (2) move simultaneously to quickly pump oil for the brake, so that the brake moves to the position quickly and realizes the rapid response of the braking action; when the brake moves to the position, the large plunger sleeve (2) automatically stops moving, and the small plunger (3) continues to move to give the brake a secondary boost and improve the final braking force; The left end of the housing cavity (1.1) is provided with an oil tank connection port (1.3), and the side wall of the housing cavity (1.1) is provided with a brake oil outlet (1.5) and a booster oil port (1.4). A large plunger sleeve (2) is movably disposed in the housing cavity (1.1). The left end of the large plunger sleeve (2) and the left end of the housing cavity (1.1) form an oil injection chamber A. The oil injection chamber A is connected to the oil tank connection port (1.3) through a follow-up one-way valve A (6). The oil injection chamber A is connected to the brake oil outlet (1.5) through a brake oil port one-way valve (9). The outer circular surface of the large plunger sleeve (2) is provided with a large plunger sleeve outer ring groove (2.5). The large plunger sleeve outer ring groove (2.5) is connected to the booster oil port (1.4). The large plunger sleeve (2) has a large plunger sleeve cavity (2.1) in the middle, and a large plunger sleeve end oil hole (2.4) is provided at the left end of the large plunger sleeve cavity (2.1). Several large plunger sleeve radial oil holes (2.6) are evenly distributed on the side wall of the large plunger sleeve cavity (2.1). A small plunger (3) is movably installed in the large plunger sleeve cavity (2.1). The left end of the small plunger (3) and the left end of the large plunger sleeve cavity (2.1) form a booster chamber B. The booster chamber B is connected to the oil hole (2.4) at the end of the large plunger sleeve through a follow-up one-way valve B (4). The booster chamber B is connected to the booster oil port (1.4) through the radial oil hole (2.6) of the large plunger sleeve. Follower check valve A (6) is elastically connected to the large plunger sleeve (2) via follower spring A (7); follower check valve B (4) is elastically connected to the small plunger (3) via follower spring B (5); A follower check valve chamber A (1.2) is provided on the left end face of the housing cavity (1.1), and a follower check valve A (6) is movably disposed in the follower check valve chamber A (1.2); a follower check valve chamber B (2.2) is provided on the left end face of the large plunger sleeve cavity (2.1), and a follower check valve B (4) is movably disposed in the follower check valve chamber B (2.2); The left end face of the housing cavity (1.1) is provided with a guide hole (1.7) for a follower check valve A. The follower check valve A (6) is provided with a guide rod, and the guide rod of the follower check valve A (6) is slidably disposed in the guide hole (1.7) of the follower check valve A. The follower check valve B (4) is provided with a guide rod, and the guide rod of the follower check valve B (4) is slidably disposed in the oil hole (2.4) at the end of the large plunger sleeve.

2. The dual-plunger booster brake pump according to claim 1, characterized in that: The booster port (1.4) is connected to the rear end of the brake port check valve (9) through the booster oil passage (1.6) of the housing (1).

3. The dual-plunger booster brake pump according to claim 1, characterized in that: A follower check valve A (6) is fixedly provided with a follower check valve A sealing gasket (6.1); a follower check valve B (4) is fixedly provided with a follower check valve B sealing gasket (4.1).

4. The dual-plunger booster brake pump according to claim 1, characterized in that: A large plunger sleeve return spring (8) is provided between the left end face of the large plunger sleeve (2) and the left end face of the housing cavity (1.1); a small plunger return spring (12) is provided on the left side of the small plunger (3).

5. The dual-plunger booster brake pump according to claim 1, characterized in that: Both the large plunger sleeve (2) and the small plunger (3) have sealing rings on their outer circumference.

6. The dual-plunger booster brake pump according to claim 1, characterized in that: The inner circumferential surface of the large plunger sleeve cavity (2.1) near the right opening end is provided with a small plunger retaining ring groove (2.8), and a small plunger retaining ring (11) is provided in the small plunger retaining ring groove (2.8); a large plunger sleeve baffle (10) is fixedly provided on the right end face of the housing (1).

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