A parallel double-cylinder brake pump

Abstract

The present invention discloses a parallel twin-cylinder brake pump, which includes an integral master cylinder casting body, a primary actuator piston component, a secondary actuator piston component, a sealing piston component, a main return spring, a U-shaped connecting oil pipe between the master cylinders, a secondary actuator piston limiting component, a sealing piston limiting component, a connecting rod fixing component, a brake pedal connecting component, a cross stop-and-pass valve core, and a sliding guiding rod for the primary actuator piston component. Wherein, a directly communicating primary chamber and secondary chamber are provided inside the integral master cylinder casting body; the primary actuator piston component is slidably installed in the primary chamber and the secondary chamber; a pressurizing and liquid supplementing chamber is provided inside the primary actuator piston component; the secondary actuator piston component is slidably installed in the pressurizing and liquid supplementing chamber; and the sealing piston component is slidably installed in the primary chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of brake systems, and particularly to a parallel dual-cylinder brake pump. Background Art

[0002] The brake pump, also known as the master cylinder of the hydraulic brake system, is the power source of the brake system when the vehicle is running. When the driver steps on the brake pedal, this brake pump is used to provide hydraulic oil with a certain pressure for the brake actuator to achieve braking.

[0003] In industries such as agriculture, transportation, and construction vehicles, a large number of vehicle types in use are medium and heavy-duty vehicles. The corresponding traditional brake pumps are limited by their inherent characteristics. When braking, greater braking force and more brake fluid are required to effectively perform braking. Therefore, the driver's experience during braking is poor and the braking effect is also not ideal. In the field of brake technology, the inherent defects of traditional brake pumps are obvious. Summary of the Invention

[0004] The purpose of the present invention is to provide a parallel dual-cylinder brake pump to fundamentally solve the above-mentioned defects existing in traditional brake pumps. Compared with traditional brake pumps, the present invention has the following advantages: 1. The fluid output of the present invention is significantly increased under a given stroke; 2. The system pressure provided by the brake pump of the present invention is significantly increased under the action of a given pedal force.

[0005] To solve the above technical problems, the present invention provides the following technical solution: a parallel double-cylinder brake pump, comprising an integral master cylinder casting, a primary actuator piston assembly, a secondary actuator piston assembly, a sealing piston assembly, a main return spring, a U-shaped connecting oil pipe between the master cylinders, a secondary actuator piston limiting component, a sealing piston limiting component, a connecting rod fixing component, a brake pedal connecting component, a cross check valve core, and a sliding guiding rod for the primary actuator piston assembly. An axially connected primary chamber and secondary chamber are provided inside the integral master cylinder casting. The primary actuator piston assembly is slidably installed in the primary chamber and the secondary chamber. A pressure-boosting liquid replenishing chamber is provided inside the primary actuator piston assembly. The secondary actuator piston assembly is slidably installed in the pressure-boosting liquid replenishing chamber. The sealing piston assembly is slidably installed in the primary chamber. The two ends of the main return spring are respectively connected to the inner wall of the secondary chamber and the outer wall of the primary actuator piston assembly. The two ends of the U-shaped connecting oil pipe between the master cylinders are respectively communicated with the secondary chambers of two integral master cylinder castings. The secondary actuator piston limiting component, the sealing piston limiting component, and the connecting rod fixing component are respectively used to limit the movement ranges of the secondary actuator piston assembly, the sealing piston assembly, and the universal connecting rod. The brake pedal connecting component is used to connect the brake pedal and the sealing piston assembly. The cross check valve core is used to control the communication between the U-shaped connecting oil pipe between the master cylinders and the secondary chamber. The sliding guiding rod for the primary actuator piston assembly is used to limit the sliding direction of the primary actuator piston assembly.

[0006] Further, the integral master cylinder casting includes a master cylinder casting body, casting flange lugs, casting fixing holes, a primary chamber, a secondary chamber, a sealing piston sliding inlet hole, a sealing piston circlip fixing groove, a sealing piston retainer limiting groove, an oil inlet hole, a guiding rod threaded hole, an oil pressure outlet, a double-cylinder connecting hole, a check valve core placement round hole, and a secondary chamber connecting hole. Two axially symmetric casting flange lugs are provided on the outer wall of the master cylinder casting body. Symmetric casting fixing holes are directly provided in the casting flange lugs. A sealing piston sliding inlet hole is provided on one side of the master cylinder casting body. The sealing piston sliding inlet hole is communicated with the primary chamber. A sealing piston circlip fixing groove and a sealing piston retainer limiting groove are provided adjacent to the end of the inner wall of the sealing piston sliding inlet hole. An oil inlet hole, an oil pressure outlet, a guiding rod threaded hole, and a secondary chamber connecting hole are respectively provided on both vertical sides of the master cylinder casting body. A check valve core placement round hole is provided on one side of the secondary chamber connecting hole. A double-cylinder connecting hole is provided on one side of the check valve core placement round hole. The oil inlet hole is mechanically connected to the primary chamber. The secondary chamber connecting hole, the oil pressure outlet, and the guiding rod threaded hole are mechanically connected to the secondary chamber.

[0007] Further, the primary actuating piston component includes a primary actuating piston body, a main spring placement cavity, a sliding limiting groove, a secondary cavity sealing groove, a secondary cavity sealing ring, a front through hole, a primary cavity sealing groove, a primary cavity sealing ring, a rear through hole, a pressurizing and liquid supplementing cavity, a limiting shoulder, a secondary actuating piston fixing groove, a first overflow hole, a second overflow hole, and an overflow check ball. On one side of the smaller end of the primary actuating piston body, a main spring placement cavity is directly opened. On the vertical side of the main spring placement cavity, a sliding limiting groove is opened. On the outer wall of the smaller end of the primary actuating piston body, a secondary cavity sealing groove is opened. The secondary cavity sealing ring is installed in the secondary cavity sealing groove. On the outer wall of the larger end of the primary actuating piston body, a primary cavity sealing groove is opened. The primary cavity sealing ring is installed in the primary cavity sealing groove. A front through hole vertically penetrating the primary actuating piston body is opened between the secondary cavity sealing groove and the primary cavity sealing groove. On the directly side of the larger end of the primary actuating piston body, a pressurizing and liquid supplementing cavity is opened. A limiting shoulder is opened between the pressurizing and liquid supplementing cavity and the main spring placement cavity. On one side of the primary cavity sealing groove, a rear through hole vertically penetrating the primary actuating piston body and the pressurizing and liquid supplementing cavity is opened. On the inner wall of the pressurizing and liquid supplementing cavity, a secondary actuating piston fixing groove is opened. On the side where the sliding limiting groove is opened, between the primary cavity sealing groove and the rear through hole, a first overflow hole vertically communicating with the pressurizing and liquid supplementing cavity and the outer wall of the primary actuating piston body is opened. On the directly side where the sliding limiting groove is opened, a second overflow hole communicating with the first overflow hole and the outer wall of the primary actuating piston body is opened. The overflow check ball is placed at the larger end of the first overflow hole.

[0008] Further, the secondary actuating piston component includes a secondary actuating piston body, a secondary actuating piston sealing groove, a secondary actuating piston sealing ring, a secondary actuating piston through hole, a secondary actuating piston sliding shoulder, a front valve cavity, a front flow hole, a rear valve cavity, a rear flow hole, a front one-way valve, a rear one-way valve, and a pressurizing spring limiting shoulder. The secondary actuating piston body is slidably installed in the pressurizing and liquid supplementing cavity. On the outer wall of the secondary actuating piston body, a secondary actuating piston sealing groove and a secondary actuating piston sliding shoulder are opened. A secondary actuating piston through hole penetrating the secondary actuating piston body is opened between the secondary actuating piston sealing groove and the secondary actuating piston sliding shoulder. The secondary actuating piston sealing ring is installed in the secondary actuating piston sealing groove. The inside of the secondary actuating piston body is directly penetrated by a front valve cavity, a front flow hole, a rear valve cavity, and a rear flow hole. The front one-way valve is installed in the front valve cavity. The rear one-way valve is installed in the rear valve cavity. On the directly side of the rear flow hole diameter, a pressurizing spring limiting shoulder is opened.

[0009] Further, the sealing piston component includes a sealing piston, a sealing piston sealing groove, a sealing piston sealing ring, a connecting rod cavity, and a connecting rod circlip fixing groove. The sealing piston is slidably installed in the primary chamber. A sealing piston sealing groove is formed on the outer wall of the sealing piston. The sealing piston sealing ring is installed in the sealing piston sealing groove. A connecting rod cavity is formed on one straight side of the sealing piston. A connecting rod circlip fixing groove is formed on the inner wall of the connecting rod cavity.

[0010] Further, the secondary actuator piston limiting component includes a boosting spring, a boosting spring retaining plate, and a boosting spring limiting circlip. The boosting spring is fixed to the boosting spring limiting shoulder. The boosting spring limiting circlip is fixed to the secondary actuator piston fixing groove. The boosting spring retaining plate is pressed and fixed to the surface of the boosting spring limiting circlip by the boosting spring.

[0011] Further, the sealing piston limiting component includes a sealing piston retaining plate and a non-removable sealing piston circlip. The non-removable sealing piston circlip is fixed to the sealing piston circlip fixing groove. The sealing piston retaining plate is fixed to the inner wall end of the sealing piston sliding inlet hole by the non-removable sealing piston circlip and the sealing piston retaining plate limiting groove.

[0012] Further, the brake pedal connecting component includes a universal connecting rod, a pedal connecting fork, and a connecting pin hole. The smaller end of the universal connecting rod is threadedly connected to the pedal connecting fork. A through connecting pin hole is formed in the larger end of the pedal connecting fork.

[0013] Further, the connecting rod fixing component includes a universal connecting rod retaining plate and a universal connecting rod circlip. The universal connecting rod circlip is fixed to the connecting rod circlip fixing groove and limits the larger end of the universal connecting rod and the universal connecting rod retaining plate inside the universal connecting rod cavity. The universal connecting rod passes through the universal connecting rod retaining plate and the universal connecting rod circlip.

[0014] Further, the cross stop valve spool includes a cross valve base body, a sealing rubber ring, a conducting rod, and a cross arc groove. The outer wall of the cross valve base body is wrapped with the sealing rubber ring. The straight bottom end of the cross valve base body is connected to the conducting rod. A cross arc groove is formed on the outer wall of the conducting rod. The straight bottom end edge of the sealing rubber ring extends beyond the straight bottom end of the cross valve base body. The outer wall of the conducting rod is adapted to the connecting hole of the secondary chamber. The cross stop valve spool is installed inside the stop valve spool placement round hole and the connecting hole of the secondary chamber.

[0015] Further, the sliding guiding rod of the primary actuator piston component is installed in the guiding rod threaded hole and partially enters the secondary chamber. The smaller end of the sliding guiding rod of the primary actuator piston component is adapted to the sliding limiting groove.

[0016] Furthermore, the first-stage cavity sealing groove, the first-stage cavity sealing ring, and the inner wall of the first-stage cavity are mutually adapted, and the sealing piston sealing ring is mutually adapted with the inner wall of the first-stage cavity. When the universal connecting rod is in a non-pressing state and the pressurizing spring is in a reset state, a relatively sealed rear fuel tank chamber is formed by the inner wall of the first-stage cavity, the sealing piston sealing ring, the second-stage actuator piston body, the first-stage actuator piston body, the oil inlet hole, the first-stage cavity sealing ring, and the rear check valve.

[0017] Furthermore, when the universal connecting rod is in a non-pressing state and the pressurizing spring is in a reset state, the oil inlet hole is the only fluid inlet of the rear fuel tank chamber, and the rear check valve is the only fluid outlet of the rear fuel tank chamber.

[0018] Furthermore, the second-stage cavity sealing ring is mutually adapted with the inner wall of the second-stage cavity. A relatively sealed front fuel tank chamber is formed by the second-stage cavity sealing ring, the inner wall of the first-stage cavity, the first-stage actuator piston body, the second-stage actuator piston body, the second-stage actuator piston sealing ring, the front check valve, the first-stage cavity sealing ring, and the rear check valve.

[0019] Furthermore, when the universal connecting rod is in a non-pressing state and the pressurizing spring is in a reset state, the front check valve is the only fluid outlet of the front fuel tank chamber, and the rear check valve is the only fluid inlet of the front fuel tank chamber.

[0020] Furthermore, a relatively sealed second-stage cavity fuel tank chamber is formed by the second-stage cavity sealing ring, the inner wall of the second-stage cavity, the first-stage actuator piston body, the second-stage actuator piston body, the second-stage actuator piston sealing ring, the front check valve, the oil pressure outlet, the double-cylinder connecting hole, and the directional rod threaded hole.

[0021] Furthermore, the oil pressure outlet is the permanent fluid outlet of the second-stage cavity fuel tank chamber, the double-cylinder connecting hole is the controlled fluid outlet of the second-stage cavity fuel tank chamber, and the front check valve is the only fluid inlet of the second-stage cavity fuel tank chamber.

[0022] Furthermore, when the universal connecting rod is in a non-pressing state and the pressurizing spring is in a reset state, the front inclined surface of the smaller end of the first-stage actuator piston body contacts the straight bottom end of the conduction rod, the straight bottom end of the sealing rubber ring is tightly combined with the main cylinder casting body, and the second-stage cavity connecting hole is blocked by the sealing rubber ring.

[0023] Furthermore, when the universal connecting rod is in a pressing state, the cross stop-and-pass valve core is lifted by the front inclined surface of the smaller end of the first-stage actuator piston body, and the second-stage cavity is communicated with the main cylinder through the second-stage cavity connecting hole, the cross arc groove, the stop-and-pass valve core placement round hole, and the double-cylinder connecting hole and the U-shaped connecting oil pipe between the cylinders.

[0024] Further, the universal link can be pushed separately to output a single braking fluid from the oil pressure outlet, or the universal link can be pushed simultaneously to output two braking fluids with balanced hydraulic pressure from the oil pressure outlet.

[0025] Further, when the universal link is in a non-pushed state, the maximum limiting angle between the universal link and the straight axis of the first-stage cavity is 15 degrees, and when the universal link completes the pushing action, the maximum limiting angle between the universal link and the straight axis of the first-stage cavity is 8 degrees.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The second-stage actuator piston component is sleeved inside the first-stage actuator piston component in the present invention, thereby providing a second-stage one-way hydraulic method. Under the condition of a given stroke of the universal link, the output volume of the fluid can be significantly increased, improving the braking efficiency. At the same time, the present invention is also provided with a first-stage cavity and a second-stage cavity. By this step-by-step aperture method, the required link braking force can be greatly reduced, providing a better braking experience for the driver. Further, in the case of simultaneous braking of the link, the present invention balances the output braking hydraulic pressure through the special structure of the cross stop valve core, optimizing the braking stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0028] Figure 1 is a schematic diagram of the partial sectional structure of a single cylinder of the present invention;

[0029] Figure 2 is a schematic diagram of the external structure of a single cylinder of the present invention;

[0030] Figure 3 is a schematic diagram of the detailed sectional structure of a single cylinder of the present invention;

[0031] Figure 4 is a schematic diagram of the internal structure of the pump body of the present invention;

[0032] Figure 5 is a schematic diagram of the external structure of the first-stage actuator piston component of the present invention;

[0033] Figure 6 is a schematic diagram of the partial sectional structure of the first-stage actuator piston component of the present invention;

[0034] Figure 7 is a schematic diagram of the installation structure of the second-stage actuator piston component and the second-stage actuator piston limiting component of the present invention;

[0035] Figure 8 is a schematic diagram of the partial sectional structure of the second-stage actuator piston component of the present invention;

[0036] Figure 9 It is a schematic diagram of the external structure of the sealing piston component and the brake pedal connecting component of the present invention;

[0037] Figure 10 It is a schematic diagram of the sectional structure of the sealing piston component, the connecting rod fixing component, and the brake pedal connecting component of the present invention;

[0038] Figure 11 It is a schematic diagram of the top view structure of the present invention;

[0039] Figure 12 It is a schematic diagram of the cross stop valve core structure of the present invention;

[0040] Figure 13 It is a schematic diagram of the simplified fuel tank chamber structure of the present invention;

[0041] In the figure: 1. Integral master cylinder casting; 1-1. Master cylinder casting body; 1-2. Casting flange lug; 1-3. Casting fixing hole; 1-4. First-stage chamber; 1-5. Second-stage chamber; 1-6. Sealing piston sliding inlet hole; 1-7. Sealing piston circlip fixing groove; 1-8. Sealing piston retainer limiting groove; 1-9. Oil circuit inlet hole; 1-10. Orientation rod threaded hole; 1-11. Oil pressure outlet; 1-12. Double-cylinder connection hole; 1-13. Check valve core placement round hole; 1-14. Second-stage chamber connection hole; 2. First-stage actuator piston assembly; 2-1. First-stage actuator piston body; 2-2. Main spring placement chamber; 2-3. Sliding limiting groove; 2-4. Second-stage chamber sealing groove; 2-5. Second-stage chamber sealing ring; 2-6. Front through hole; 2-7. First-stage chamber sealing groove; 2-8. First-stage chamber sealing ring; 2-9. Rear through hole; 2-10. Boosting and replenishing chamber; 2-11. Limiting shoulder; 2-12. Second-stage actuator piston fixing groove; 2-13. First overflow hole; 2-14. Second overflow hole; 2-15. Overflow check ball; 3. Second-stage actuator piston assembly; 3-1. Second-stage actuator piston body; 3-2. Second-stage actuator piston sealing groove; 3-3. Second-stage actuator piston sealing ring; 3-4. Second-stage actuator piston through hole; 3-5. Second-stage actuator piston sliding shoulder; 3-6. Front valve chamber; 3-7. Front flow hole; 3-8. Rear valve chamber; 3-9. Rear flow hole; 3-10. Front check valve; 3-11. Rear check valve; 3-12. Boosting spring limiting shoulder; 4. Sealing piston assembly; 4-1. Sealing piston; 4-2. Sealing piston sealing groove; 4-3. Sealing piston sealing ring; 4-4. Link chamber; 4-5. Link circlip fixing groove; 5. Main return spring; 6. U-shaped connecting oil pipe between master cylinders; 7. Second-stage actuator piston limiting component; 7-1. Boosting spring; 7-2. Boosting spring retainer; 7-3. Boosting spring limiting circlip; 8. Sealing piston limiting component; 8-1. Sealing piston retainer; 8-2. Non-removable circlip for sealing piston; 9. Brake pedal connecting component; 9-1. Universal link; 9-2. Pedal connecting fork; 9-3. Connecting pin hole; 10. Link fixing component; 10-1. Universal link retainer; 10-2. Universal link circlip; 11. Cross check valve core; 11-1. Cross valve base; 11-2. Sealing rubber ring; 11-3. Conducting rod; 11-4. Cross arc groove; 12. First-stage actuator piston assembly sliding orientation rod; 13. Rear fuel tank chamber; 14. Front fuel tank chamber; 15. Second-stage chamber fuel tank chamber. Detailed implementation mode

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Please refer to Figures 1-13 , the present invention provides a technical solution:

[0044] As Figure 1 shown in the partial sectional structure schematic diagram of the single cylinder of the present invention, it is easy to know that the single cylinder components of the present invention include an integral main cylinder casting body 1, a primary actuator piston component 2, a secondary actuator piston component 3, a sealing piston component 4, a main return spring 5, a U-shaped connecting oil pipe 6 between the main cylinders, a secondary actuator piston limiting component 7, a sealing piston limiting component 8, a brake pedal connecting component 9, a connecting rod fixing component 10, a cross stop valve core 11, and a sliding guiding rod 12 of the primary actuator piston component. The initial state of the present invention is described as follows: Refer to Figure 3 , Figure 4 , Figure 6 , Figure 8 , Figure 10 , the universal connecting rod 9-1 in the figure is in an uncompressed state. At this time, the primary actuator piston component 2, the secondary actuator piston component 3, and the sealing piston component 4 are pushed and fixed to the right side of the integral main cylinder casting body 1 by the main return spring 5. The oil inlet hole 1-9 is blocked by the primary cavity sealing ring 2-8 or the primary actuator piston body 2-1. The rear check valve 3-11 only allows fluid to flow from the rear oil tank chamber 13 into the front oil tank chamber 14. Since no external fluid enters the rear oil tank chamber 13, the internal pressure of the rear oil tank chamber 13 is balanced. At the same time, the only fluid inlet and outlet of the front oil tank chamber 14 are the rear check valve 3-11 and the front check valve 3-10 respectively, and the internal pressure of the rear oil tank chamber 13 is balanced. Therefore, no external fluid enters the front oil tank chamber 14, and the internal pressure of the front oil tank chamber 14 is balanced. Similarly, the front inclined surface at the smaller end of the primary actuator piston body 2-1 contacts the straight bottom end of the conduction rod 11-3, the straight bottom end of the sealing rubber ring 11-2 is tightly combined with the main cylinder casting body 1-1, the secondary cavity connection hole 1-14 is blocked by the sealing rubber ring 11-2, the front check valve 3-10 only allows fluid to flow from the front oil tank chamber 14 into the secondary cavity oil tank chamber 15, the secondary cavity oil tank chamber 15 has no external fluid pressure, and the internal pressure of the secondary cavity oil tank chamber 15 is balanced.

[0045] The description of the outer structure and connection method of the present invention is as follows:

[0046] Refer to Figure 2 , Figure 11, around the main cylinder casting body 1-1 in the figure, there is a casting body flange lug 1-2, and a casting body fixing hole 1-3 runs through the casting body flange lug 1-2. This casting body fixing hole 1-3 is used to connect with an external structure to fix this brake pump. Refer to Figure 9 、 Figure 10 At the smaller end of the universal link 9-1, it is threadedly connected to the pedal connection fork 9-2. The pedal connection fork 9-2 can be connected to an external device such as a pedal through the connection pin hole 9-3. Through the pedal connection fork 9-2 and the universal link 9-1, the external force is transmitted to the sealing piston 4-1.

[0047] The description of the function of the cross stop valve core 11 is as follows:

[0048] Refer to Figure 3 , in the present invention, both ends of the U-shaped connecting oil pipe 6 between the main cylinders are respectively connected to the secondary chambers 1-5 of the two integral main cylinder casting bodies 1. The internal and external structures of these two integral main cylinder casting bodies 1 are the same. For better representation, ~ will be used to distinguish them in the following text.

[0049] Refer to Figure 3 and Figure 12 , when the universal link 9-1 is pushed, the universal link 9-1 drives the sealing piston 4-1 and the primary actuator piston body 2-1 to move to the left respectively. When the universal link 9-1 is in the non-pushed state, the front inclined surface of the smaller end of the primary actuator piston body 2-1 contacts the straight bottom end of the conduction rod 11-3, the straight bottom end of the sealing rubber ring 11-2 is tightly combined with the main cylinder casting body 1-1, and the secondary chamber connection hole 1-14 is blocked by the sealing rubber ring 11-2. Therefore, when the link 9-1 is in the pushed state, the cross stop valve core 11 is lifted by the front inclined surface of the smaller end of the primary actuator piston body 2-1, and the secondary chamber 1-5 is communicated with the U-shaped connecting oil pipe 6 between the main cylinders through the secondary chamber connection hole 1-14, the cross arc groove 11-4, the stop valve core placement round hole 1-13, and the double cylinder connection hole 1-12. At this time, the fluid pressure at the oil pressure outlet 1-11 is the same as that in the U-shaped connecting oil pipe 6 between the main cylinders. At this time, the secondary chamber 1-5 is in a high-pressure state compared with the secondary chamber 1-5~. The fluid in the U-shaped connecting oil pipe 6 between the main cylinders exerts a reverse pressure on the cross stop valve core 11~. The straight bottom end of the sealing rubber ring 11-2~ is tightly combined with the main cylinder casting body 1-1~, and the secondary chamber connection hole 1-14~ is not communicated, so the fluid in the U-shaped connecting oil pipe 6 between the main cylinders cannot enter the secondary chamber 1-5~. Correspondingly, when a pushing action is simultaneously performed on the universal link 9-1 and the universal link 9-1~, the secondary chamber 1-5 and the secondary chamber 1-5~ are communicated through the U-shaped connecting oil pipe 6 between the main cylinders. Therefore, the purpose of balancing the internal hydraulic pressure of the secondary chamber 1-5 and the secondary chamber 1-5~ can be achieved, and further the fluid hydraulic pressures output through the oil pressure outlet 1-11 and the oil pressure outlet 1-11~ are the same. This effect is very useful and necessary for this parallel double-cylinder brake pump.

[0050] In the present invention, some parts or components have a certain adaptation relationship to optimize the effect of realizing functions. The description in this regard is as follows:

[0051] Refer to Figures 4 to 10 , in the present invention, the displacement of the universal link 9-1 relative to the link cavity 4-4 is restricted by the universal link retaining piece 10-1, the universal link circlip 10-2, and the link circlip fixing groove 4-5. The displacement of the seal piston assembly 4 relative to the seal piston sliding inlet hole 1-6 is restricted by the seal piston retaining piece 8-1, the non-removable seal piston circlip 8-2, the seal piston circlip fixing groove 1-7, and the seal piston retaining piece limiting groove 1-8. The displacement of the secondary actuator piston body 3-1 relative to the pressurizing and replenishing fluid cavity 2-10 is restricted by the pressurizing spring 7-1, the pressurizing spring retaining piece 7-2, the pressurizing spring limiting circlip 7-3, the limiting shoulder 2-11, and the secondary actuator piston fixing groove 2-12. Further explanation, the primary actuator piston body 2-1 slides in the primary cavity 1-4 and the secondary cavity 1-5 through the secondary cavity sealing ring 2-5, the primary cavity sealing ring 2-8, the sliding limiting groove 2-3, and the primary actuator piston assembly sliding guide rod 1-10. The seal piston assembly 4 slides in the primary cavity 1-4 through the seal piston sealing ring 4-3.

[0052] The following content specifically describes the operation process and realized functions of the present invention, as follows:

[0053] Refer to Figure 3 、 Figure 13 , under the push of an external force, the initial movement is carried out. The universal link 9-1 drives the primary actuator piston body 2-1 and the secondary actuator piston body 3-1 to move to the left of the integral master cylinder casting 1. At this time, the oil inlet hole 1-9 is blocked by the primary cavity sealing ring 2-8 or the primary actuator piston body 2-1. There is the following external force balance formula:

[0054] F0 =f+F z +F t (1)

[0055] Where F0 is the power to push the universal link 9-1, f is the frictional force of the seal, F z is the fluid pressure in the secondary cavity 1-5, and F t is the elastic force of the main return spring 5.

[0056] Since the front check valve 3-10 only allows fluid to enter the secondary cavity oil tank chamber 15 from the front oil tank chamber 14, in this process, the fluid in the secondary cavity oil tank chamber 15 is preliminarily pressurized by the primary actuator piston assembly 2 and the secondary actuator piston assembly 3. This process is the initial pressurizing and replenishing fluid process of the secondary cavity oil tank chamber of the present invention.

[0057] As the primary actuator piston body 2-1 and the secondary actuator piston body 3-1 further move to the left of the integral master cylinder casting 1, the oil circuit inlet hole 1-9 gradually opens, and part of the fluid enters the rear oil tank chamber 13 through the oil circuit inlet hole 1-9. At this time, the following external force balance formula exists:

[0058] F1 +F y =f+F z +F t (2)

[0059] Where F1 is the power to push the universal connecting rod 9-1, F y is the fluid pressure flowing into the rear oil tank chamber 13, f is the frictional force of the seal, F z is the fluid pressure in the secondary chamber 1-5, F t is the elastic force of the main return spring 5.

[0060] This process is the pressure boosting and fluid replenishing process of the rear oil tank chamber of the present invention. Comparing Formula 1 and Formula 2, it is easy to know that when switching from the initial pressure boosting and fluid replenishing process of the secondary chamber oil tank to the pressure boosting and fluid replenishing process, with the same pedal force of the driver, the system pressure provided by the brake pump increases.

[0061] Part of the fluid enters the rear oil tank chamber 13 through the oil circuit inlet hole 1-9, making the hydraulic pressure in the rear oil tank chamber 13 higher than that in the front oil tank chamber 14. As a result, part of the fluid enters the front oil tank chamber 14 from the rear oil tank chamber 13 through the rear one-way valve 3-11. At the same time, as the universal connecting rod 9-1 is pushed, the liquid storage volume of the front oil tank chamber 14 becomes smaller, and the fluid pressure in the front oil tank chamber 14 continues to rise. At this time, the following formula exists:

[0062] ΔF q-h =F q -F h <f t (3)

[0063] Where ΔF q-h is the fluid pressure difference between the front oil tank chamber 14 and the rear oil tank chamber 13, F q is the fluid pressure in the front oil tank chamber 14, F h is the fluid pressure in the rear oil tank chamber 13, f t is the elastic force of the pressure boosting spring 7-1. In the initial stage when the fluid pressure in the front oil tank chamber 14 continues to rise, ΔF q-h is less than f t, the boosting spring 7-1 is not compressed. However, during the pushing process of the universal link 9-1, the fluid pressure in the front-end oil tank chamber 14 will be greater than that in the secondary chamber oil tank chamber 15. Eventually, part of the high-pressure fluid will enter the secondary chamber oil tank chamber 15 from the front-end oil tank chamber 14. Under the condition that the given stroke of the universal link 9-1 is L, this process can provide an additional hydraulic output volume V for the secondary chamber oil tank chamber 15 额外 and an additional hydraulic pressure F 额外 , and at the same time, there is the following pressure balance formula for the secondary chamber oil tank chamber 15:

[0064] (F t +F 部分 ) * Πd2 2 =(F1 + F y ) * Πd1 2

[0065] where F1 is the power to push the universal link 9-1, F y is the fluid pressure flowing into the rear-end oil tank chamber 13, F 部分 is the fluid pressure of part of the secondary chamber 1-5, F t is the elastic force of the main return spring 5, d1 is the radius of the first-stage chamber 1-4, d2 is the radius of the secondary chamber 1-5, and by derivation,

[0066]

[0067] then the total fluid pressure F of the secondary chamber 1-5 z =F 部分 +F 额外 .

[0068] Under the condition that the given stroke of the universal link 9-1 is L, the output fluid volume V = L * Πd1 2 +V 额外 , where d1 is the radius of the first-stage chamber 1-4.

[0069] It can be easily known from the above description that compared with the traditional brake pump, the fluid output volume of the present invention is significantly improved under the given stroke condition, and the braking pressure output under the given link power is also significantly improved.

[0070] As ΔF q-h continues to rise, ΔF q-hWhen the force is greater than the elastic force of the supercharging spring 7-1, the supercharging spring 7-1 is compressed and the first overflow hole 2-13 can communicate with the front oil tank chamber 14. The high-pressure fluid in the front oil tank chamber 14 enters the rear oil tank chamber 13 through the first overflow hole 2-13 and the second overflow hole 2-14, causing the excess fluid in the front oil tank chamber 14 to overflow back to the rear oil tank chamber 13, ensuring that the fluid pressure in the front oil tank chamber 14 is within the limit range. At the same time, since the fluid in the front oil tank chamber 14 and the fluid in the secondary chamber oil tank chamber 15 are unidirectionally conducted through the front one-way valve 3-10, the braking pressure output by the secondary chamber oil tank chamber 15 will also be limited within the range.

[0071] When the universal connecting rod 9-1 completes the pushing action, the outer wall of the primary actuator piston component 2 contacts the inner wall of the integral master cylinder casting 1. At this time, the first overflow hole 2-13 and the front oil tank chamber 14 are in a critical non-conducting state (i.e., actually in a non-conducting state but at the critical conduction point), and the supercharging spring 7-1 is compressed. After that, the pushing force of the universal connecting rod 9-1 disappears, and the primary actuator piston component 2 and the secondary actuator piston component 3 are pushed to the right side of the integral master cylinder casting 1 by the elastic force of the main return spring 5 and the hydraulic pressure of the secondary chamber oil tank chamber 15. The volume of the solution in the front oil tank chamber 14 increases, and the internal fluid pressure decreases. The fluid in the rear oil tank chamber 13 enters the front oil tank chamber 14 through the rear one-way valve 3-11. At this time, ΔF q-h is less than f t . The supercharging spring 7-1 gradually returns to its initial state, and at the same time, the overflow stop ball 2-15 blocks the first overflow hole 2-13 due to the pressure difference. During the reset process, the secondary chamber oil tank chamber 15 is filled with the fluid from the front oil tank chamber 14, and the front oil tank chamber 14 is filled with the fluid from the rear oil tank chamber 13. Before the oil inlet hole 1-9 is closed, the internal pressures of the rear oil tank chamber 13, the front oil tank chamber 14, and the secondary chamber oil tank chamber 15 gradually reach pressure balance.

[0072] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0073] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A parallel twin-cylinder brake pump, comprising an integral master cylinder casting, a primary actuator piston assembly, a secondary actuator piston assembly, a sealing piston assembly, a main return spring, a U-shaped connecting oil pipe between master cylinders, a secondary actuator piston limiting component, a sealing piston limiting component, a connecting rod fixing component, a brake pedal connecting component, a cross stop valve core, and a sliding orientation rod for the primary actuator piston assembly, characterized in that: The integral master cylinder casting body is internally provided with a directly connected first-stage chamber and a second-stage chamber. The first-stage actuating piston component is slidably installed in the first-stage chamber and the second-stage chamber. The first-stage actuating piston component is internally provided with a pressure-boosting liquid supplementing chamber. The second-stage actuating piston component is slidably installed in the pressure-boosting liquid supplementing chamber. The sealing piston component is slidably installed in the first-stage chamber. The main return spring is connected at both ends to the inner wall of the second-stage chamber and the outer wall of the first-stage actuating piston component respectively. The two ends of the U-shaped connecting oil pipe between the master cylinders are respectively communicated with the second-stage chambers of two integral master cylinder casting bodies. The second-stage actuating piston limiting component, the sealing piston limiting component and the connecting rod fixing component are respectively used to limit the movement ranges of the second-stage actuating piston component, the sealing piston component and the universal connecting rod. The brake pedal connecting component is used to connect the brake pedal and the sealing piston component. The cross stop-and-pass valve core is used to control the communication between the U-shaped connecting oil pipe between the master cylinders and the second-stage chamber. The first-stage actuating piston component sliding directional rod is used to limit the sliding direction of the first-stage actuating piston component.

2. The parallel double-cylinder brake pump according to claim 1, characterized in that: The integral master cylinder casting body includes a master cylinder casting body main body, casting body flange lugs, casting body fixing holes, a first-stage chamber, a second-stage chamber, a sealing piston sliding inlet hole, a sealing piston circlip fixing groove, a sealing piston retaining piece limiting groove, an oil path inlet hole, a directional rod threaded hole, an oil pressure outlet, a double-cylinder connecting hole, a stop-and-pass valve core placement round hole and a second-stage chamber connecting hole. Two axially symmetric casting body flange lugs are provided on the outer wall of the master cylinder casting body main body. Each casting body flange lug is provided with a casting body fixing hole. A sealing piston sliding inlet hole is provided on the right side of the master cylinder casting body main body. The sealing piston sliding inlet hole is communicated with the first-stage chamber. The inner wall end of the sealing piston sliding inlet hole is provided with a sealing piston circlip fixing groove and a sealing piston retaining piece limiting groove. The master cylinder casting body main body is provided with an oil path inlet hole and a directional rod threaded hole. The master cylinder casting body main body is provided with an oil pressure outlet and a second-stage chamber connecting hole. A stop-and-pass valve core placement round hole is provided on the side of the second-stage chamber connecting hole away from the first-stage chamber. A double-cylinder connecting hole is provided on the side of the stop-and-pass valve core placement round hole away from the second-stage chamber connecting hole. The oil path inlet hole is mechanically connected with the first-stage chamber. The second-stage chamber connecting hole, the oil pressure outlet and the directional rod threaded hole are mechanically connected with the second-stage chamber.

3. The parallel double-cylinder brake pump according to claim 2, characterized in that: The primary actuating piston component includes a primary actuating piston body, a main spring placement cavity, a sliding limit groove, a secondary chamber sealing groove, a secondary chamber sealing ring, a front through hole, a primary chamber sealing groove, a primary chamber sealing ring, a rear through hole, a pressurizing and replenishing liquid cavity, a limit shoulder, a secondary actuating piston fixing groove, a first overflow hole, a second overflow hole, and an overflow check ball. Inside the smaller end of the primary actuating piston body, there is a main spring placement cavity. A sliding limit groove is provided on the side wall of the main spring placement cavity. On the outer wall of the smaller end of the primary actuating piston body, there is a secondary chamber sealing groove. The secondary chamber sealing ring is installed in the secondary chamber sealing groove. On the outer wall of the larger end of the primary actuating piston body, there is a primary chamber sealing groove. The primary chamber sealing ring is installed in the primary chamber sealing groove. A front through hole vertically penetrating the primary actuating piston body is provided between the secondary chamber sealing groove and the primary chamber sealing groove. Inside the larger end of the primary actuating piston body, there is a pressurizing and replenishing liquid cavity. A limit shoulder is provided between the pressurizing and replenishing liquid cavity and the main spring placement cavity. On one side of the primary chamber sealing groove, there is a rear through hole vertically penetrating the primary actuating piston body and the pressurizing and replenishing liquid cavity. On the inner wall of the pressurizing and replenishing liquid cavity, there is a secondary actuating piston fixing groove. On one side where the sliding limit groove is provided, a first overflow hole communicating the pressurizing and replenishing liquid cavity and the outer wall of the primary actuating piston body is vertically provided between the primary chamber sealing groove and the rear through hole. On one side where the sliding limit groove is provided, a second overflow hole communicating the first overflow hole and the outer wall of the primary actuating piston body is directly provided. The overflow check ball is placed at the larger end of the first overflow hole.

4. The parallel double-cylinder brake pump according to claim 3, characterized in that: The secondary actuating piston component includes a secondary actuating piston body, a secondary actuating piston sealing groove, a secondary actuating piston sealing ring, a secondary actuating piston through hole, a secondary actuating piston sliding shoulder, a front valve cavity, a front flow hole, a rear valve cavity, a rear flow hole, a front one-way valve, a rear one-way valve, and a pressurizing spring limit shoulder. The secondary actuating piston body is slidably installed in the pressurizing and replenishing liquid cavity. On the outer wall of the secondary actuating piston body, there are a secondary actuating piston sealing groove and a secondary actuating piston sliding shoulder. A secondary actuating piston through hole penetrating the secondary actuating piston body is provided between the secondary actuating piston sealing groove and the secondary actuating piston sliding shoulder. The secondary actuating piston sealing ring is installed in the secondary actuating piston sealing groove. Inside the secondary actuating piston body, there is directly a front valve cavity, a front flow hole, a rear valve cavity, and a rear flow hole penetrating through. The front one-way valve is installed in the front valve cavity. The rear one-way valve is installed in the rear valve cavity. A pressurizing spring limit shoulder is provided on the right side of the rear flow hole.

5. The parallel double-cylinder brake pump according to claim 4, characterized in that: The sealing piston component includes a sealing piston, a sealing piston sealing groove, a sealing piston sealing ring, a connecting rod cavity, and a connecting rod circlip fixing groove. The sealing piston is slidably installed in the primary chamber. On the outer wall of the sealing piston, there is a sealing piston sealing groove. The sealing piston sealing ring is installed in the sealing piston sealing groove. Inside the sealing piston, there is a connecting rod cavity. On the inner wall of the connecting rod cavity, there is a connecting rod circlip fixing groove.

6. The parallel twin-cylinder brake pump according to claim 5, wherein: The secondary execution piston limiting component includes a supercharging spring, a supercharging spring retaining plate, and a supercharging spring limiting circlip. The supercharging spring is fixed to the supercharging spring limiting shoulder platform, the supercharging spring limiting circlip is fixed to the secondary execution piston fixing groove, and the supercharging spring retaining plate is pressed and fixed to the surface of the supercharging spring limiting circlip by the supercharging spring.

7. The parallel double-cylinder brake pump according to claim 6, characterized in that: The sealing piston limiting component includes a sealing piston retaining plate and a non-removable sealing piston circlip. The non-removable sealing piston circlip is fixed to the sealing piston circlip fixing groove, and the sealing piston retaining plate is fixed to the inner wall end of the sealing piston sliding inlet hole by the non-removable sealing piston circlip and the sealing piston retaining plate limiting groove.

8. A parallel double-cylinder brake pump according to claim 7, characterized in that: The brake pedal connecting component includes a universal connecting rod, a pedal connecting fork, and a connecting pin hole. The smaller end of the universal connecting rod is threadedly connected to the pedal connecting fork, and a through connecting pin hole is provided at the larger end of the pedal connecting fork.

9. The parallel double-cylinder brake pump according to claim 8, characterized in that: The connecting rod fixing component includes a universal connecting rod retaining plate and a universal connecting rod circlip. The universal connecting rod circlip is fixed to the connecting rod circlip fixing groove and limits the larger end of the universal connecting rod and the universal connecting rod retaining plate inside the universal connecting rod cavity. The universal connecting rod passes through the universal connecting rod retaining plate and the universal connecting rod circlip.

10. A parallel double-cylinder brake pump according to claim 9, characterized in that: The cross stop and through valve core includes a cross valve base body, a sealing rubber ring, a conducting rod, and a cross arc groove. The outer wall of the cross valve base body is wrapped with a sealing rubber ring. One side of the cross valve base body is connected to a conducting rod, and a cross arc groove is provided on the outer wall of the conducting rod. One side edge of the sealing rubber ring extends beyond one side of the cross valve base body. The outer wall of the conducting rod is adapted to the secondary cavity connection hole. The cross stop and through valve core is installed inside the stop and through valve core placement round hole and the secondary cavity connection hole.

11. A parallel double-cylinder brake pump according to claim 3, characterized in that: The sliding guiding rod of the primary execution piston component is installed in the guiding rod threaded hole and partially enters the secondary cavity. The smaller end of the sliding guiding rod of the primary execution piston component is adapted to the sliding limiting groove.

12. A parallel twin-cylinder brake pump according to claim 5, characterized in that: The primary cavity sealing groove, the primary cavity sealing ring are adapted to the inner wall of the primary cavity, and the sealing piston sealing ring is adapted to the inner wall of the primary cavity. When the universal connecting rod is in a non-pressing state and the supercharging spring is in a reset state, a relatively sealed rear fuel tank chamber is formed by the inner wall of the primary cavity, the sealing piston sealing ring, the secondary execution piston body, the primary execution piston body, the oil path inlet hole, the primary cavity sealing ring, and the rear check valve.

13. A parallel twin-cylinder brake pump according to claim 12, characterized in that: When the universal connecting rod is in a non-pressing state and the supercharging spring is in a reset state, the oil path inlet hole is the only fluid inlet of the rear fuel tank chamber, and the rear check valve is the only fluid outlet of the rear fuel tank chamber.

14. A parallel twin-cylinder brake pump according to claim 5, characterized in that: The secondary cavity sealing ring is adapted to the inner wall of the secondary cavity. A relatively sealed front fuel tank chamber is formed by the secondary cavity sealing ring, the inner wall of the primary cavity, the primary execution piston body, the secondary execution piston body, the secondary execution piston sealing ring, the front check valve, the primary cavity sealing ring, and the rear check valve.

15. A parallel double-cylinder brake pump according to claim 14, characterized in that: When the universal connecting rod is in a non-pressing state and the supercharging spring is in a reset state, the front check valve is the only fluid outlet of the front fuel tank chamber, and the rear check valve is the only fluid inlet of the front fuel tank chamber.

16. A parallel twin-cylinder brake pump according to claim 5, characterized in that: A relatively sealed secondary chamber fuel tank chamber is formed by the secondary chamber sealing ring, the inner wall of the secondary chamber, the primary actuator piston body, the secondary actuator piston body, the secondary actuator piston sealing ring, the front check valve, the oil pressure outlet, the double-cylinder connection hole, and the directional rod threaded hole.

17. A parallel twin-cylinder brake pump according to claim 16, characterized in that: The oil pressure outlet is the permanent fluid outlet of the secondary chamber fuel tank chamber, the double-cylinder connection hole is the controlled fluid outlet of the secondary chamber fuel tank chamber, and the front check valve is the only fluid inlet of the secondary chamber fuel tank chamber.

18. A parallel twin-cylinder brake pump according to claim 10, characterized in that: When the universal connecting rod is in a non-pressing state and the boosting spring is in a reset state, the front inclined surface of the smaller end of the primary actuator piston body contacts the conduction rod, the straight bottom end of the sealing rubber ring is tightly combined with the main cylinder casting body, and the secondary chamber connection hole is blocked by the sealing rubber ring.

19. A parallel double-cylinder brake pump according to claim 10, characterized in that: When the universal connecting rod is in a pressing state, the cross stop-and-pass valve core is lifted by the front inclined surface of the smaller end of the primary actuator piston body, and the secondary chamber is communicated with the main cylinder through the secondary chamber connection hole, the cross arc groove, the stop-and-pass valve core placement round hole, and the double-cylinder connection hole by the U-shaped connecting oil pipe.

20. A parallel twin-cylinder brake pump according to claim 10, characterized in that: The universal connecting rod can be pressed individually, and then a single braking fluid is output from the oil pressure outlet. The universal connecting rod can also be pressed simultaneously, and then two braking fluids with hydraulic balance are output from the oil pressure outlet.

Images