Vehicle brake booster pump

Abstract

The utility model provides a vehicle brake booster pump, and belongs to the technical field of brake pumps. The problem that an existing brake booster pump is large in size is solved. The vehicle brake booster pump comprises a pump body and a piston assembly, a cavity in the pump body is sequentially divided into an oil inlet cavity, an oil supplementing cavity and a brake cavity through the piston assembly, the piston assembly comprises a piston rod, a first communicating hole, a second communicating hole, a third communicating hole and a main cavity are formed in the piston rod, and an adjusting valve element and an elastic piece are arranged in the main cavity. The adjusting valve element separates the oil inlet cavity under the action of the elastic force of the elastic piece, the oil supplementing cavity and the braking cavity are communicated through the main cavity, the adjusting valve element can overcome the elastic force of the elastic piece to move under the action of oil pressure in the braking cavity, and the oil supplementing cavity is made to be communicated with the oil inlet cavity through the second communicating hole, the main cavity and the third communicating hole. The vehicle brake booster pump has the advantage that the volume of the brake booster pump cannot be increased under the condition that the brake effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of brake pumps and relates to a vehicle brake booster pump. Background Art

[0002] The vehicle brake pump is one of the core components of the entire vehicle braking system. Its main function is to convert the mechanical force generated when the driver steps on the brake pedal into hydraulic energy, and then transmit it to the brakes of each wheel through the brake fluid, thereby achieving vehicle deceleration or stopping.

[0003] Existing vehicle brake pumps, for example, Chinese patent literature discloses a booster master pump [patent number: 202220553718.3; application publication number: CN216861423U]. The booster master pump includes a pump body and a piston assembly arranged in the pump body. The inner cavity of the pump body is divided into a brake chamber, an oil replenishing chamber and an oil inlet chamber in sequence by the piston assembly. The piston assembly between the brake chamber and the oil replenishing chamber is connected with a seal that enables oil to flow unidirectionally to the brake chamber. The side of the pump body is provided with an oil inlet connected to the oil inlet chamber. The pump body also has an adjusting chamber, and an adjusting valve core and an elastic member are arranged in the adjusting chamber. The adjusting chamber is respectively connected to the brake chamber, the oil replenishing chamber and the oil inlet. The adjusting valve core can block the oil replenishing chamber and the oil inlet under the elastic force of the elastic member. The adjusting valve core can overcome the elastic force of the elastic member and move under the oil pressure of the brake chamber to connect the oil replenishing chamber and the oil inlet.

[0004] The booster master pump of this structure uses the oil in the brake chamber with higher and more stable oil pressure as the power source for opening the regulating valve core. When the oil pressure in the brake chamber reaches the critical value, the regulating valve core is opened to quickly and stably discharge the oil in the oil replenishment chamber to the oil inlet, thereby reducing the oil pressure in the oil replenishment chamber and replenishing the oil at the oil inlet, reducing the braking resistance and increasing the braking force in disguise. However, the booster master pump of this structure has a protruding block protruding from the pump body, and the regulating chamber, regulating valve core and other components are located in the protruding block. The setting of the protruding block makes the overall structure of the pump body larger and occupies more space. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a vehicle brake booster pump, which solves the technical problem of how to improve the braking effect without increasing the volume of the brake booster pump.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a vehicle brake booster pump, comprising a pump body and a piston assembly arranged in the pump body, the piston assembly divides the cavity inside the pump body into an oil inlet chamber, an oil replenishing chamber and a brake chamber in sequence, the piston assembly can make the oil in the oil inlet chamber flow to the oil replenishing chamber in one direction, and can make the oil in the oil replenishing chamber flow to the brake chamber in one direction, the piston assembly comprises a piston rod, characterized in that the piston rod has a first connecting hole, a second connecting hole, a third connecting hole and a main chamber, the first connecting hole, the second connecting hole and the third connecting hole are arranged in sequence along the direction from the brake chamber to the oil inlet chamber, and the first connecting hole is arranged along the piston rod Axially arranged, the second connecting hole and the third connecting hole are both arranged along the radial direction of the piston rod, the first connecting hole connects the brake chamber with the main chamber, the second connecting hole connects the oil replenishing chamber with the main chamber, and the third connecting hole connects the oil inlet chamber with the main chamber. A regulating valve core and an elastic member are provided in the main chamber. The regulating valve core blocks the oil inlet chamber, the oil replenishing chamber and the brake chamber from being connected through the main chamber under the action of the elastic force of the elastic member, and the regulating valve core can overcome the elastic force of the elastic member and move under the action of the oil pressure in the brake chamber, so that the oil replenishing chamber is connected to the oil inlet chamber through the second connecting hole, the main chamber and the third connecting hole.

[0007] In the initial state, the oil pressure in the oil inlet chamber, the oil replenishing chamber and the brake chamber is consistent. When braking is required, the piston rod moves along the oil inlet chamber toward the brake chamber, so that the oil in the oil replenishing chamber and the brake chamber is squeezed and the pressure increases. In this process, the oil in the oil replenishing chamber will flow to the brake chamber in one direction, so that the oil pressure in the brake chamber will not be lower than the oil pressure in the oil replenishing chamber, and even slightly greater than the oil pressure in the oil replenishing chamber, thereby achieving braking. When the oil pressure in the brake chamber reaches the set value, the oil in the brake chamber acts on the regulating valve core through the first connecting hole, and overcomes the elastic force of the elastic member to push the regulating valve core along the brake chamber toward the oil inlet chamber, so that the oil replenishing chamber is connected to the oil inlet chamber through the second connecting hole, the main chamber, and the third connecting hole. Since the pressure of the oil in the oil replenishing chamber is greater than the pressure of the oil in the oil inlet chamber, the oil in the oil replenishing chamber flows to the oil inlet chamber through the second connecting hole, the main chamber and the third connecting hole, replenishing the oil in the oil inlet chamber, reducing the braking resistance, and increasing the braking force in disguise. After the braking is completed, the piston rod moves along the brake chamber toward the oil inlet chamber and returns to the initial state. The oil pressure in the oil inlet chamber, the oil replenishing chamber and the brake chamber remains consistent again, and the regulating valve core returns to the initial position under the action of the elastic member. The regulating valve core and the elastic member in the present application are both located in the piston rod, that is, located inside the pump body, and do not occupy the external space of the pump body, so that the overall volume of the booster pump is small and the external space occupied is small. At the same time, the first connecting hole, the second connecting hole and the third connecting hole are all arranged in the piston rod, and the structural arrangement is more reasonable. The regulating valve core is used to realize the connection or isolation of the oil inlet chamber, the oil replenishing chamber and the brake chamber, which can better link the piston rod and the regulating valve core, so that the piston rod and the regulating valve core are sensitive to reaction and move smoothly, thereby improving the braking effect of the brake booster pump. That is, the brake booster pump of this vehicle will not increase the volume of the brake booster pump while improving the braking effect. Moreover, the first connecting hole is arranged along the axial direction of the piston rod, and the flow direction of the oil in the first connecting hole is consistent with the moving direction of the regulating valve core, which can better promote the movement of the regulating valve core, and the second connecting hole and the third connecting hole are both arranged along the radial direction of the piston rod, that is, the flow of oil in the second connecting hole and the third connecting hole hinders the movement of the regulating valve core as little as possible, thereby improving the sensitivity of the regulating valve core and improving the braking effect of the brake booster pump.

[0008] In the above-mentioned vehicle brake booster pump, the main chamber passes through one end of the piston rod, and a plug is fixedly connected to one end of the piston rod. One end of the elastic member acts on the plug, and the other end acts on the regulating valve core. The plug has a fourth connecting hole, and the fourth connecting hole is arranged along the axial direction of the piston rod. The fourth connecting hole makes the main chamber always connected with the oil inlet chamber. The plug is detachable, which makes it easy to disassemble and assemble the regulating valve core and the elastic member. The fourth connecting hole is arranged so that the main chamber is always connected with the oil inlet chamber, so that the pressure on one end of the regulating valve core is always the oil pressure of the oil inlet chamber, so that the regulating valve core does not have the problem of being stuck, and the stability of the booster pump is improved.

[0009] In the above-mentioned vehicle brake booster pump, the piston rod also has a fifth connecting hole, the fifth connecting hole is arranged along the radial direction of the piston rod, the third connecting hole is located between the second connecting hole and the fifth connecting hole, and the fifth connecting hole makes the main chamber always connected with the oil inlet chamber. The setting of the fifth connecting hole makes the end of the main chamber close to the oil inlet chamber always connected with the oil inlet chamber, so that the pressure on one end of the regulating valve core is always the oil pressure of the oil inlet chamber, so that the regulating valve core does not have the problem of being stuck, and the stability of the booster pump is improved.

[0010] In the above-mentioned vehicle brake booster pump, the regulating valve core is sleeved with a first seal and a second seal, the first seal is located between the first connecting hole and the second connecting hole, and the second seal is located between the second connecting hole and the third connecting hole under the action of the elastic force of the elastic member, and the regulating valve core can overcome the elastic force of the elastic member under the action of the oil pressure in the brake chamber and move along the brake chamber toward the oil inlet chamber, so that the third connecting hole is located between the second connecting hole and the second seal. The first seal and the second seal are sealing rings, and both of the first seal and the second seal play a sealing role, so that there is no problem of pressure release between the chambers inside the pump body, thereby improving the sensitivity and braking effect of braking.

[0011] In the above-mentioned vehicle brake booster pump, the regulating valve core includes a small diameter section, a middle diameter section and a large diameter section, the small diameter section is located between the middle diameter section and the large diameter section, the first sealing member is sleeved outside the middle diameter section, the second sealing member is sleeved outside the large diameter section, and the connecting point between the oil replenishing chamber and the second connecting hole is located between the middle diameter section and the large diameter section along the axial direction of the piston rod. The oil pressure in the oil replenishing chamber can act on the end faces of the inner ends of the middle diameter section and the large diameter section that are relatively arranged through the second connecting hole and the main chamber. The outer diameter of the large diameter section is larger than the outer diameter of the middle diameter section, and the outer diameter of the middle diameter section is larger than the outer diameter of the small diameter section. During braking, the force of the oil replenishing chamber on the end faces of the inner ends of the middle diameter section and the large diameter section that are relatively arranged is different. The oil pressure in the oil replenishing chamber assists the oil pressure in the brake chamber, so that the regulating valve core can be pushed faster, thereby improving the sensitivity of braking.

[0012] In the above-mentioned vehicle brake booster pump, the pump body has an oil inlet, an oil outlet and a first oil return hole, the oil inlet is connected to the oil inlet chamber, the oil outlet is connected to the brake chamber, and when the piston rod is in the initial state, the first oil return hole connects the oil replenishing chamber with the oil inlet, and when the piston rod moves a distance along the oil inlet chamber toward the brake chamber, the first oil return hole connects the oil inlet chamber and the oil inlet. When the piston rod is in the initial state, the first oil return hole is connected to the oil replenishing chamber, so that the oil in the oil replenishing chamber can flow back to the oil inlet, so that the oil pressure in the oil replenishing chamber is the same as the oil pressure in the oil inlet chamber, so that when the brake booster pump starts to work, the resistance is small. When working, the first oil return hole is connected to the oil inlet chamber, so that the oil can enter the oil inlet chamber faster, thereby improving the braking force.

[0013] In the above-mentioned vehicle brake booster pump, the second connecting hole and the third connecting hole are both arranged close to the oil inlet. This structure shortens the distance between the second connecting hole and the third connecting hole and the oil inlet, so that the oil can flow into the second connecting hole and the third connecting hole more quickly, thereby improving the sensitivity of the brake booster pump.

[0014] In the above-mentioned vehicle brake booster pump, the pump body has a transition chamber, a second oil return hole and a third oil return hole, the second oil return hole connects the oil replenishing chamber and the transition chamber, when the piston rod is in the initial state, the third oil return hole connects the brake chamber with the transition chamber, and when the piston rod moves a distance along the oil inlet chamber toward the brake chamber, the third oil return hole connects the oil replenishing chamber and the transition chamber. When the piston rod is in the initial state, the brake chamber is connected to the oil replenishing chamber through the third oil return hole, the transition chamber and the second oil return hole, so that the oil in the brake chamber can flow back to the oil replenishing chamber, so that the oil pressure of the brake chamber and the oil replenishing chamber is consistent. When braking, the third oil return hole connects the oil replenishing chamber and the transition chamber, so that the oil in the brake chamber will not flow into the oil replenishing chamber through the third oil return hole, the transition chamber and the second oil return hole, thereby ensuring the braking effect.

[0015] In the above-mentioned vehicle brake booster pump, the piston assembly further includes a first leather cup and a second leather cup, the first leather cup and the second leather cup are sleeved outside the piston rod at intervals, the first leather cup is located between the oil inlet chamber and the oil replenishing chamber, the first leather cup can make the oil in the oil inlet chamber flow to the oil replenishing chamber in one direction, the second leather cup is located between the oil replenishing chamber and the brake chamber, the second leather cup can make the oil in the oil replenishing chamber flow to the brake chamber in one direction. The first leather cup and the second leather cup are used to more tightly fit the cavity wall outwardly and bend inwardly away from the cavity wall to achieve unidirectional conduction, the design is reasonable, and the first leather cup and the second leather cup have both sealing functions.

[0016] In the above-mentioned vehicle brake booster pump, the piston assembly further includes an extrusion cylinder, the extrusion cylinder is located in the brake chamber, the extrusion cylinder is fixedly connected to the piston rod through a hollow bolt, and the brake chamber is connected to the first connecting hole through the hollow bolt. The brake chamber is connected to the first connecting hole through the hollow bolt, and the structure does not make other changes, and the design is reasonable.

[0017] Compared with the prior art, the vehicle brake booster pump provided by the utility model has the following advantages:

[0018] 1. The regulating valve core and the elastic member of the brake booster pump are both located in the piston rod, that is, inside the pump body, and do not occupy the external space of the pump body, so that the overall volume of the booster pump is small and the external space occupied is small. At the same time, the first connecting hole, the second connecting hole and the third connecting hole are all arranged in the piston rod, and the structural arrangement is more reasonable. The regulating valve core is used to realize the connection or isolation of the oil inlet chamber, the oil replenishing chamber and the brake chamber, which can better link the piston rod and the regulating valve core, so that the piston rod and the regulating valve core are sensitive to reaction and move smoothly, so that the vehicle brake booster pump will not increase the volume of the brake booster pump while improving the braking effect.

[0019] 2. The first connecting hole of the brake booster pump is arranged along the axial direction of the piston rod. The flow direction of the oil in the first connecting hole is consistent with the movement direction of the regulating valve core, which can better promote the movement of the regulating valve core. The second connecting hole and the third connecting hole are both arranged along the radial direction of the piston rod, that is, the flow of oil in the second connecting hole and the third connecting hole hinders the movement of the regulating valve core as little as possible, thereby improving the sensitivity of the regulating valve core and improving the braking effect of the brake booster pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a sectional view of the overall structure of the brake booster pump of this vehicle.

[0021] Figure 2 This is a schematic diagram of the initial state of the brake booster pump of this vehicle.

[0022] Figure 3 This is a schematic diagram of the vehicle's brake booster pump in braking state.

[0023] Figure 4 It is a schematic diagram of the transition chamber and hollow bolt of the brake booster pump of this vehicle.

[0024] In the figure, 1. pump body; 2. piston assembly; 21. piston rod; 22. plug; 23. first leather cup; 24. second leather cup; 25. extrusion cylinder; 26. hollow bolt; 3. oil inlet chamber; 4. oil replenishing chamber; 5. brake chamber; 6. first connecting hole; 7. second connecting hole; 8. third connecting hole; 9. regulating valve core; 91. small diameter section; 92. medium diameter section; 93. large diameter section; 10. elastic member; 11. fourth connecting hole; 12. first sealing member; 13. second sealing member; 14. fifth connecting hole; 15. oil inlet; 16. oil outlet; 17. first oil return hole; 18. transition chamber; 19. second oil return hole; 20. third oil return hole; 27. main chamber. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] like Figure 1 As shown, the vehicle brake booster pump includes a pump body 1 , a piston assembly 2 , a regulating valve core 9 , an elastic member 10 , a first sealing member 12 and a second sealing member 13 .

[0027] The piston assembly 2 is arranged in the pump body 1. The piston assembly 2 divides the cavity inside the pump body 1 into an oil inlet chamber 3, an oil replenishing chamber 4 and a brake chamber 5 in sequence. Specifically, the piston assembly 2 includes a piston rod 21, a plug 22, a first leather cup 23, a second leather cup 24, an extrusion cylinder 25 and a hollow bolt 26. The first leather cup 23 and the second leather cup 24 are sleeved outside the piston rod 21 at intervals. The first leather cup 23 is located between the oil inlet chamber 3 and the oil replenishing chamber 4. The first leather cup 23 can make the oil in the oil inlet chamber 3 flow to the oil replenishing chamber 4 in one direction. The second leather cup 24 is located between the oil replenishing chamber 4 and the brake chamber 5. The second leather cup 24 can make the oil in the oil replenishing chamber 4 flow to the brake chamber 5 in one direction. The extrusion cylinder 25 is located in the brake chamber 5. The extrusion cylinder 25 is fixedly connected to the piston rod 21 through the hollow bolt 26. The brake chamber 5 is connected to the first connecting hole 6 through the hollow bolt 26.

[0028] The pump body 1 has an oil inlet 15, an oil outlet 16, a first oil return hole 17, a transition chamber 18, a second oil return hole 19 and a third oil return hole 20. The oil inlet 15 is connected to the oil inlet chamber 3, and the oil outlet 16 is connected to the brake chamber 5. Figure 4 As shown, the second oil return hole 19 connects the oil replenishing chamber 4 and the transition chamber 18. When the piston rod 21 is in the initial state, the first oil return hole 17 connects the oil replenishing chamber 4 with the oil inlet 15, and the third oil return hole 20 connects the brake chamber 5 with the transition chamber 18. When the piston rod 21 moves a distance along the oil inlet chamber 3 toward the brake chamber 5, the first oil return hole 17 connects the oil inlet chamber 3 and the oil inlet 15, and the third oil return hole 20 connects the oil replenishing chamber 4 and the transition chamber 18.

[0029] The piston rod 21 has a first connecting hole 6, a second connecting hole 7, a third connecting hole 8, a main chamber 27 and a fifth connecting hole 14. The first connecting hole 6, the second connecting hole 7, the third connecting hole 8 and the fifth connecting hole 14 are arranged in sequence along the direction of the brake chamber 5 toward the oil inlet chamber 3. The first connecting hole 6 and the fifth connecting hole 14 are both arranged along the axial direction of the piston rod 21, and the second connecting hole 7 and the third connecting hole 8 are both arranged along the radial direction of the piston rod 21. The first connecting hole 6 connects the brake chamber 5 with the main chamber 27, the second connecting hole 7 connects the oil replenishing chamber 4 with the main chamber 27, the third connecting hole 8 connects the oil inlet chamber 3 with the main chamber 27, and the fifth connecting hole 14 connects the main chamber 27 with the oil inlet chamber 3 at all times. The second connecting hole 7 and the third connecting hole 8 are both arranged close to the oil inlet port 15.

[0030] The main chamber 27 passes through one end of the piston rod 21, and a plug 22 is fixedly connected to one end of the piston rod 21. One end of the elastic member 10 acts on the plug 22, and the other end acts on the regulating valve core 9. The plug 22 has a fourth connecting hole 11, and the fourth connecting hole 11 is arranged along the axial direction of the piston rod 21. The fourth connecting hole 11 makes the main chamber 27 always connected with the oil inlet chamber 3.

[0031] A regulating valve core 9 and an elastic member 10 are provided in the main chamber 27. The regulating valve core 9 includes a small diameter section 91, a middle diameter section 92 and a large diameter section 93. The small diameter section 91 is located between the middle diameter section 92 and the large diameter section 93. The first sealing member 12 is sleeved outside the middle diameter section 92, and the first sealing member 12 is located between the first connecting hole 6 and the second connecting hole 7. The second sealing member 13 is sleeved outside the large diameter section 93. The second sealing member 13 is located between the second connecting hole 7 and the third connecting hole 8 under the action of the elastic force of the elastic member 10. The connecting point between the oil replenishing chamber 4 and the second connecting hole 7 is located between the middle diameter section 92 and the large diameter section 93 along the axial direction of the piston rod 21. The oil pressure in the oil replenishing chamber 4 can act on the end faces of the inner ends of the middle diameter section 92 and the large diameter section 93 which are relatively arranged through the second connecting hole 7 and the main chamber 27.

[0032] like Figure 2 As shown, in the initial state, the oil pressures in the oil inlet chamber 3, the oil replenishing chamber 4 and the brake chamber 5 are kept consistent. Under the elastic force of the elastic member 10, the second sealing member 13 is located between the second connecting hole 7 and the third connecting hole 8, and the regulating valve core 9 prevents the oil inlet chamber 3, the oil replenishing chamber 4 and the brake chamber 5 from being connected through the main chamber 27. Figure 3As shown, during braking, the piston rod 21 moves along the oil inlet chamber 3 toward the brake chamber 5. When the oil pressure in the brake chamber 5 reaches the set value, the oil in the brake chamber 5 acts on the regulating valve core 9 through the hollow bolt 26 and the first connecting hole 6, and overcomes the elastic force of the elastic member 10 to push the regulating valve core 9 along the brake chamber 5 toward the oil inlet chamber 3, so that the second sealing member 13 is located between the third connecting hole 8 and the fifth connecting hole 14, and the oil replenishing chamber 4 is connected with the oil inlet chamber 3 through the second connecting hole 7, the main chamber 27, and the third connecting hole 8, so that the oil in the oil replenishing chamber 4 flows to the oil inlet chamber 3 through the second connecting hole 7, the main chamber 27, and the third connecting hole 8, replenishing the oil inlet chamber 3 with oil, reducing the braking resistance, and increasing the braking force in disguise. After braking, under the elastic action of the elastic member 10, the regulating valve core 9 returns to its initial position, so that the second sealing member 13 is located between the second connecting hole 7 and the third connecting hole 8, and the piston rod 21 moves along the brake chamber 5 toward the oil inlet chamber 3 and returns to its initial state, so that the oil pressure in the oil inlet chamber 3, the oil replenishing chamber 4 and the brake chamber 5 remains consistent again.

[0033] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0034] Although the pump body 1, piston assembly 2, piston rod 21, plug 22, first leather cup 23, second leather cup 24, extrusion cylinder 25, hollow bolt 26, oil inlet chamber 3, oil replenishment chamber 4, brake chamber 5, first connecting hole 6, second connecting hole 7, third connecting hole 8, regulating valve core 9, small diameter section 91, middle diameter section 92, large diameter section 93, elastic member 10, fourth connecting hole 11, first sealing member 12, second sealing member 13, fifth connecting hole 14, oil inlet 15, oil outlet 16, first oil return hole 17, transition chamber 18, second oil return hole 19, third oil return hole 20, main chamber 27 and other terms are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A vehicle brake booster pump, comprising a pump body (1) and a piston assembly (2) arranged in the pump body (1), wherein the piston assembly (2) divides the cavity inside the pump body (1) into an oil inlet cavity (3), an oil replenishing cavity (4) and a brake cavity (5) in sequence, and the piston assembly (2) can make the oil in the oil inlet cavity (3) flow unidirectionally to the oil replenishing cavity (4), and can make the oil in the oil replenishing cavity (4) flow unidirectionally to the brake cavity (5), and the piston assembly (2) comprises a piston rod (21), characterized in that: The piston rod (21) has a first connecting hole (6), a second connecting hole (7), a third connecting hole (8) and a main chamber (27). The first connecting hole (6), the second connecting hole (7) and the third connecting hole (8) are arranged in sequence along the direction from the brake chamber (5) toward the oil inlet chamber (3). The first connecting hole (6) is arranged along the axial direction of the piston rod (21), and the second connecting hole (7) and the third connecting hole (8) are both arranged along the radial direction of the piston rod (21). The first connecting hole (6) connects the brake chamber (5) with the main chamber (27), and the second connecting hole (7) connects the oil replenishing chamber (4) with the main chamber (27). ), the third connecting hole (8) connects the oil inlet chamber (3) with the main chamber (27), the main chamber (27) is provided with a regulating valve core (9) and an elastic member (10), the regulating valve core (9) blocks the oil inlet chamber (3) under the action of the elastic force of the elastic member (10), the oil replenishing chamber (4) and the brake chamber (5) are connected through the main chamber (27), the regulating valve core (9) can overcome the elastic force of the elastic member (10) and move under the action of the oil pressure in the brake chamber (5), so that the oil replenishing chamber (4) is connected to the oil inlet chamber (3) through the second connecting hole (7), the main chamber (27) and the third connecting hole (8).

2. A vehicle brake booster pump according to claim 1, characterized in that: The main chamber (27) passes through one end of the piston rod (21), and one end of the piston rod (21) is fixedly connected to a plug (22). One end of the elastic member (10) acts on the plug (22), and the other end acts on the regulating valve core (9). The plug (22) has a fourth connecting hole (11), and the fourth connecting hole (11) is arranged along the axial direction of the piston rod (21). The fourth connecting hole (11) allows the main chamber (27) to always be connected to the oil inlet chamber (3).

3. A vehicle brake booster pump according to claim 1, characterized in that: The piston rod (21) also has a fifth connecting hole (14), which is arranged along the radial direction of the piston rod (21). The third connecting hole (8) is located between the second connecting hole (7) and the fifth connecting hole (14). The fifth connecting hole (14) allows the main chamber (27) to always be connected to the oil inlet chamber (3).

4. A vehicle brake booster pump according to claim 1, 2 or 3, characterized in that: The regulating valve core (9) is sleeved with a first sealing member (12) and a second sealing member (13); the first sealing member (12) is located between the first connecting hole (6) and the second connecting hole (7); the second sealing member (13) is located between the second connecting hole (7) and the third connecting hole (8) under the action of the elastic force of the elastic member (10); the regulating valve core (9) can overcome the elastic force of the elastic member (10) under the action of the oil pressure in the brake chamber (5) and move along the direction from the brake chamber (5) toward the oil inlet chamber (3), so that the third connecting hole (8) is located between the second connecting hole (7) and the second sealing member (13).

5. A vehicle brake booster pump according to claim 4, characterized in that: The regulating valve core (9) comprises a small diameter section (91), a middle diameter section (92) and a large diameter section (93); the small diameter section (91) is located between the middle diameter section (92) and the large diameter section (93); the first sealing member (12) is sleeved outside the middle diameter section (92); the second sealing member (13) is sleeved outside the large diameter section (93); and the connecting point between the oil replenishing chamber (4) and the second connecting hole (7) is located between the middle diameter section (92) and the large diameter section (93) along the axial direction of the piston rod (21).

6. A vehicle brake booster pump according to claim 1, 2 or 3, characterized in that: The pump body (1) is provided with an oil inlet (15), an oil outlet (16) and a first oil return hole (17); the oil inlet (15) is connected to the oil inlet chamber (3); the oil outlet (16) is connected to the brake chamber (5); when the piston rod (21) is in an initial state, the first oil return hole (17) connects the oil replenishing chamber (4) with the oil inlet (15); when the piston rod (21) moves a certain distance along the direction from the oil inlet chamber (3) to the brake chamber (5), the first oil return hole (17) connects the oil inlet chamber (3) and the oil inlet (15).

7. A vehicle brake booster pump according to claim 6, characterized in that: The second connecting hole (7) and the third connecting hole (8) are both arranged close to the oil inlet (15).

8. A vehicle brake booster pump according to claim 1, 2 or 3, characterized in that: The pump body (1) is provided with a transition chamber (18), a second oil return hole (19) and a third oil return hole (20); the second oil return hole (19) is connected to the oil replenishing chamber (4) and the transition chamber (18); when the piston rod (21) is in an initial state, the third oil return hole (20) connects the brake chamber (5) with the transition chamber (18); when the piston rod (21) moves a certain distance along the oil inlet chamber (3) toward the brake chamber (5), the third oil return hole (20) connects the oil replenishing chamber (4) and the transition chamber (18).

9. A vehicle brake booster pump according to claim 1, 2 or 3, characterized in that: The piston assembly (2) further comprises a first leather cup (23) and a second leather cup (24), wherein the first leather cup (23) and the second leather cup (24) are spaced apart and sleeved outside the piston rod (21), wherein the first leather cup (23) is located between the oil inlet chamber (3) and the oil replenishing chamber (4), and the first leather cup (23) enables the oil in the oil inlet chamber (3) to flow unidirectionally to the oil replenishing chamber (4), and the second leather cup (24) is located between the oil replenishing chamber (4) and the brake chamber (5), and the second leather cup (24) enables the oil in the oil replenishing chamber (4) to flow unidirectionally to the brake chamber (5).

10. A vehicle brake booster pump according to claim 1, 2 or 3, characterized in that: The piston assembly (2) further comprises an extrusion cylinder (25), wherein the extrusion cylinder (25) is located in the brake chamber (5), the extrusion cylinder (25) is fixedly connected to the piston rod (21) via a hollow bolt (26), and the brake chamber (5) is connected to the first connecting hole (6) via the hollow bolt (26).

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