Pressurizing brake master cylinder

Abstract

The utility model provides a supercharging brake master cylinder, and belongs to the technical field of brake systems. The problem that an existing brake pump is high in manufacturing cost is solved. The pressurizing brake master pump comprises a pump body and a columnar piston, the outer side of the piston is provided with a first protruding shoulder and a second protruding shoulder which are both in an annular shape, the first protruding shoulder and the second protruding shoulder are distributed in the axial direction of the piston at intervals, and the second protruding shoulder is closer to the end portion of the other end of the piston than the first protruding shoulder. Annular sealing pieces are fixed to the outer side of the first protruding shoulder and the outer side of the second protruding shoulder, the outer sides of the two sealing pieces abut against the inner wall of the pump body, a plurality of oil supplementing holes are formed in the second protruding shoulder in the axial direction in a penetrating mode and distributed around the axis of the piston, and an annular sealing gasket and an annular sealing spring are arranged between the first protruding shoulder and the second protruding shoulder. The sealing gasket and the sealing spring are both arranged on the outer side of the piston in a sleeving mode, and the sealing gasket can move towards the second convex shoulder under the elastic force effect of the sealing spring and block all the oil supplementing holes. The supercharging brake master cylinder has the advantage of being low in manufacturing cost.

Description

Technical Field

[0001] This utility model belongs to the field of braking system technology and relates to a booster brake master cylinder. Background Technology

[0002] Braking systems typically employ hydraulic braking, and mainly include components such as the brake pedal, booster, master cylinder, reservoir, hydraulic lines, wheel cylinders, brake pads, and brake discs. Among these, the master cylinder is an indispensable and crucial component of the automotive braking system.

[0003] For example, a combined multi-functional plunger-type brake master cylinder has been designed and a Chinese patent has been applied for, with application number 201910955501.8 and publication number CN110641438A. This combined multi-functional plunger-type brake master cylinder includes a first piston, a piston cup, a flange, a second piston, and a master cylinder body. A cuboid block is provided on the master cylinder body, and an oil inlet hole is opened on the cuboid block. An oil outlet hole is opened on the side of the master cylinder body and on the cuboid block. The oil inlet hole and the oil outlet hole are connected to the oil reservoir of the master cylinder body. The first piston and the second piston are both embedded in the master cylinder body. The piston cup is installed in the master cylinder body and is fixedly sleeved on the first piston and the second piston respectively. A spring limit seat is snapped into one end of the first piston and one end of the second piston. A first spring and a second spring are respectively provided in the two sets of spring limit seats. The flange is fixedly sleeved on one end of the master cylinder body, and a flange hole is opened on the protrusion of the flange.

[0004] In this system, the first and second pistons inside the main cylinder are each equipped with an annular lip cup between themselves and the inner wall of the main cylinder. The lip cup, without changing its shape, serves to seal the various chambers separated by several lip cups inside the main cylinder. When the side of the lip cup subjected to force is subjected to higher oil pressure, the lip cup can contract and deform to achieve one-way oil replenishment between the two chambers adjacent to the lip cup.

[0005] However, during braking, in order to ensure a seal, the piston cup needs to remain in contact with the piston and master cylinder. This causes the piston cup to wear when there is relative displacement between the piston and master cylinder. In order to ensure the one-way oil replenishment function, the piston cup also needs to have a certain degree of elasticity to switch between contraction deformation and expansion sealing. This places high demands on the material and manufacturing process of the piston cup, increasing manufacturing costs. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a booster brake master cylinder, which solves the problem of high manufacturing costs of existing brake pumps.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A booster brake master cylinder includes a pump body and a cylindrical piston, one end of which extends into the pump body. The piston has two annular protrusions on its outer side, one and two, which are spaced apart along the axial direction of the piston, with the second shoulder closer to the other end of the piston than the first shoulder. Annular seals are fixed to the outer sides of both shoulders, and the outer sides of both seals abut against the inner wall of the pump body. Several oil filling holes are axially distributed on the second shoulder, circumferentially around the piston axis. An annular sealing gasket and sealing spring are disposed between the first and second shoulders, both sleeved on the outer side of the piston. The sealing gasket can move towards the second shoulder under the elastic force of the sealing spring and seal all the aforementioned oil filling holes.

[0009] In this booster brake master cylinder, two annular protruding shoulders, shoulder 1 and shoulder 2, are formed on the outer side of the piston. Sealing elements, which abut against the inner wall of the pump body, are fixed to the outer sides of shoulders 1 and shoulder 2, dividing the pump body cavity from the inside out into a braking chamber, a replenishing chamber, and an inlet chamber. The sealing elements serve only to seal between the piston and the pump body. After braking, when the piston returns to its original position, the inlet chamber needs to replenish the replenishing chamber with oil. Since the oil pressure in the inlet chamber is higher than that in the replenishing chamber, this higher pressure acts on the sealing gasket, causing it to overcome the elastic force of the sealing spring and move. The oil in the inlet chamber then flows into the replenishing chamber through several replenishing holes, achieving unidirectional replenishment.

[0010] In this booster brake master cylinder, the seals and gaskets serve the functions of sealing and one-way oil replenishment, respectively. In actual production, the seals only need to be made of materials with good wear resistance, while the gaskets can be made of ordinary rubber or other sealing materials. Compared with the diaphragm, which needs to balance wear resistance and elasticity, this greatly reduces the requirements for materials and manufacturing processes, thereby reducing manufacturing costs. Furthermore, the individual function of the seals and gaskets ensures the stability of the seals and gaskets during operation, thus ensuring the lifespan and stability of the seal.

[0011] In the aforementioned booster brake master cylinder, two annular gaskets, Gasket 1 and Gasket 2, are fitted around the piston. Gasket 1 is positioned between the sealing spring and the sealing gasket, while Gasket 2 is positioned between the sealing gasket and the shoulder. By providing Gasket 1 and Gasket 2 on both sides of the sealing gasket, deformation of the sealing gasket under the elastic force of the sealing spring and the impact of oil in the oil inlet chamber is prevented, ensuring the effectiveness of the seal.

[0012] In the aforementioned booster brake master cylinder, the sealing gasket has a strip-shaped groove on the side facing the gasket one. The length of the strip-shaped groove is aligned with the radial direction of the sealing gasket, and there is a gap between the inner wall of the sealing gasket and the outer side of the piston. The strip-shaped groove prevents the gasket one from completely fitting against the sealing gasket, while the gap allows the sealing gasket to move smoothly relative to the piston.

[0013] In the aforementioned booster brake master cylinder, one end of the piston has a recessed hole, and the side of the piston is provided with a side hole 1, a side hole 2, and a side hole 3, all communicating with the recessed hole. The side holes 1, 2, and 3 are distributed at intervals along the axial direction of the piston. The side holes 1 and 2 are located between the shoulders 1 and 2, and the side hole 3 is located on the other side of the shoulder 2 opposite to the shoulder 1. A pressure relief valve core and a pressure relief spring are provided in the recessed hole. The end of the pressure relief valve core facing the opening of the recessed hole is located between the side holes 1 and 2, and the outer side of this end of the pressure relief valve core forms a seal with the side wall of the recessed hole. The side of the pressure relief valve core has a protruding sealing part corresponding to the position of the side hole 3, and the sealing part can block the port of the side hole 3. In the default state, the pressure relief valve core moves towards the concave opening under the elastic force of the pressure relief spring. The end of the pressure relief valve core facing the concave opening blocks the concave opening between side hole one and side hole two. The sealing part on the side of the pressure relief valve core blocks side hole three. When the oil pressure in the oil replenishment chamber is too high, the oil pressure acts on the end of the pressure relief valve core through side hole one, causing it to move against the elastic force of the pressure relief spring. The protruding sealing part leaves the port of side hole three, and side hole two and side hole three are connected through the concave opening. The oil in the oil replenishment chamber is discharged to the oil inlet chamber, reducing the resistance to the piston moving inward.

[0014] In the aforementioned booster brake master cylinder, a replenishing valve core, a replenishing spring, and a replenishing valve sleeve are further provided inside the recess. A seal is formed between the outer side of the replenishing valve sleeve and the side wall of the recess, and the sealing position is located between the first side hole and the opening of the recess. The end of the replenishing valve sleeve facing the opening of the recess has a recessed axial hole. A radial hole communicating with the axial hole is opened through the side of the replenishing valve sleeve, and the radial hole is located between the sealing position between the replenishing valve sleeve and the recess and the first side hole. The replenishing valve core is disposed between the replenishing valve sleeve and the opening of the recess, and the replenishing valve core can partially extend into the axial hole and block the axial hole under the elastic force of the replenishing spring. By default, the replenishing valve core blocks the axial hole under the elastic force of the replenishing spring. The oil in the replenishing chamber flows through side hole one and the radial hole to the axial hole. When the oil pressure in the replenishing chamber is high, the oil pressure acts on the replenishing valve core, causing it to move against the elastic force of the replenishing spring and open the axial hole. The oil in the replenishing chamber then flows sequentially through side hole one, the radial hole, the axial hole, and the concave hole to the brake chamber, thus replenishing the brake chamber. In this booster brake master cylinder, both the replenishing structure and the pressure relief structure are designed inside the piston, making the structure more compact and reducing the size of the brake pump.

[0015] In the aforementioned booster brake master cylinder, the replenishing valve core includes a rod-shaped valve stem and a sealing sleeve sleeved and axially fixed to the outside of the valve stem. The sealing sleeve has a protruding, annular sealing protrusion on the side facing the replenishing valve sleeve. This sealing protrusion abuts against the replenishing valve sleeve under the elastic force of the replenishing spring. The rod-shaped valve stem is used to pass through the replenishing valve sleeve for movement and guidance, and the sealing protrusion abuts against the replenishing valve sleeve to form a seal, ensuring a sealing effect.

[0016] Compared with existing technologies, in this booster brake master cylinder, the seal and the gasket serve the functions of sealing and one-way oil replenishment, respectively. In actual production, the seal only needs to be made of materials with good wear resistance, while the gasket can be made of ordinary rubber or other sealing materials. Compared with the diaphragm, which needs to balance wear resistance and elasticity, this greatly reduces the requirements for materials and manufacturing processes, thereby reducing manufacturing costs. Furthermore, the independent function of the seal and the gasket ensures the stability of the seal and the gasket during operation, thus ensuring the life and stability of the seal. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural schematic diagram of the booster brake master cylinder.

[0018] Figure 2 This is a magnified view of a portion of the booster brake master cylinder.

[0019] In the diagram, 1. Pump body; 2. Piston; 21. Shoulder 1; 22. Shoulder 2; 23. Oil filling hole; 24. Recessed hole; 25. Side hole 1; 26. Side hole 2; 27. Side hole 3; 3. Seal; 4. Sealing gasket; 41. Strip groove; 5. Sealing spring; 6. Gasket 1; 7. Gasket 2; 8. Pressure relief valve core; 81. Sealing part; 9. Pressure relief spring; 10. Oil filling valve core; 101. Valve stem; 102. Sealing sleeve; 103. Sealing protrusion; 11. Oil filling spring; 12. Oil filling valve sleeve; 121. Axial hole; 122. Radial hole. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0021] like Figure 1As shown, this booster brake master cylinder includes a pump body 1 and a cylindrical piston 2. One end of the piston 2 extends into the pump body 1. The outer side of the piston 2 has two annular protrusions, a first shoulder 21 and a second shoulder 22. The first shoulder 21 and the second shoulder 22 are spaced apart along the axial direction of the piston 2, and the second shoulder 22 is closer to the other end of the piston 2 than the first shoulder 21. Annular seals 3 are fixed to the outer sides of both the first shoulder 21 and the second shoulder 22, and the outer sides of both seals 3 abut against the inner wall of the pump body 1. In this embodiment, the outer sides of the first shoulder 21 and the second shoulder 22 are provided with recessed annular sealing grooves. The two seals 3 are respectively disposed in the two sealing grooves. The seals 3 are composed of two annular parts, so that the first shoulder 21 and the inner wall of the pump body 1, as well as the second shoulder 22 and the inner wall of the pump body 1, form a seal, thereby dividing the inner cavity of the pump body 1 into a brake chamber, a replenishing chamber, and an inlet chamber from the inside to the outside.

[0022] like Figure 2 As shown, several oil filling holes 23 are axially oriented through the second shoulder 22, and the oil filling holes 23 are distributed around the axis of the piston 2. Between the first shoulder 21 and the second shoulder 22, there are annular sealing gaskets 4, sealing springs 5, gaskets 1 and 2, and gaskets 2 and 7. The sealing springs 5, gaskets 1 and 6, sealing gaskets 4 and 2 are sequentially sleeved on the outside of the piston 2 along the axial direction. One end of the sealing spring 5 abuts against the first shoulder 21, and the other end abuts against the gasket 1. The sealing gasket 4 can push the gasket 2 and abut against the second shoulder 22 under the elastic force of the sealing spring 5, thus blocking all the oil filling holes 23. In this embodiment, gasket 6 can be made of metal, and gasket 7 can be made of metal or rubber as needed; the sealing gasket 4 has several strip grooves 41 on the side facing gasket 6, the length direction of the strip grooves 41 is consistent with the radial direction of the sealing gasket 4, and the strip grooves 41 radiate outward with the axis of piston 2 as the center, and there is a gap between the inner wall of the sealing gasket 4 and the outer side of piston 2.

[0023] The piston 2 has a recessed hole 24 at one end. A side hole 25, a side hole 26, and a side hole 27, all communicating with the recessed hole 24, are provided through the side of the piston 2. These three side holes are distributed sequentially and at intervals along the axial direction of the piston 2. Side holes 25 and 26 are located between shoulders 21 and 22, while side hole 27 is located on the opposite side of shoulder 22 relative to shoulder 21. That is, side holes 25 and 26 connect the oil filling chamber and the recessed hole 24, while side hole 27 connects the oil inlet chamber and the oil filling chamber.

[0024] A pressure relief valve core 8 and a pressure relief spring 9 are provided inside the recess 24. One end of the pressure relief valve core 8 facing the opening of the recess 24 is located between the first side hole 25 and the second side hole 26, and an annular sealing ring is fixed on the outer side of this end of the pressure relief valve core 8 to form a seal with the side wall of the recess 24. The side of the pressure relief valve core 8 has a protruding sealing part 81 corresponding to the position of the third side hole 27, and the sealing part 81 can block the port of the third side hole 27. The pressure relief valve core 8 is located between the pressure relief spring 9 and the opening of the recess 24. In this embodiment, the sealing part 81 includes an annular protrusion protruding from the outside of the pressure relief valve core 8 and an annular sealing ring fixed on the protrusion; the piston 2 includes a cylindrical split part one and a cylindrical split part two, with a shoulder 1 21 located outside the split part one and a shoulder 22 located outside the split part two, the end of the split part two facing the split part one being recessed, the end of the split part one being inserted into the split part two, and the two being sealed by the sealing ring; the side hole 3 27 includes a through hole 1 opened on the split part one and a through hole 2 opened on the split part two, with a gap connecting the split hole 1 and the split hole 2 between the split part one and the split part two; the inner side of the split part one has a protruding annular shoulder, and the shoulder is located between the side hole 1 25 and the side hole 26, and the pressure relief valve core 8 can abut against the shoulder under the elastic force of the pressure relief spring 9.

[0025] The recess 24 is also equipped with an oil replenishing valve core 10, an oil replenishing spring 11, and an oil replenishing valve sleeve 12. An annular sealing ring is fixed to the outer side of the oil replenishing valve sleeve 12, forming a seal with the side wall of the recess 24. This sealing ring is positioned between the side hole 25 and the opening of the recess 24. One end of the oil replenishing valve sleeve 12 facing the pressure relief valve core 8 abuts against the pressure relief valve core 8, and there is a gap between the outer side of the oil replenishing valve sleeve 12 and the inner wall of the shoulder. An annular retaining ring is fixed to the side wall of the recess 24 at the other end of the oil replenishing valve sleeve 12, which is used to axially limit the oil replenishing valve sleeve 12. The end of the oil replenishing valve sleeve 12 facing the recessed hole 24 has a recessed axial hole 121. The side of the oil replenishing valve sleeve 12 has a radial hole 122 that communicates with the axial hole 121. The radial hole 122 is located between the sealing position between the oil replenishing valve sleeve 12 and the recessed hole 24 and the side hole 25. The oil replenishing valve core 10 is located between the oil replenishing valve sleeve 12 and the opening of the recessed hole 24. The oil replenishing valve core 10 can partially extend into the axial hole 121 and block the axial hole 121 under the elastic force of the oil replenishing spring 11. In this embodiment, the oil replenishing valve core 10 includes a rod-shaped valve stem 101 and a sealing sleeve 102 sleeved and axially fixed to the outside of one end of the valve stem 101. The other end of the valve stem 101 extends into the oil replenishing valve sleeve 12. A ring-shaped spring seat is fixed to the inner wall of the piston 2 at the opening of the concave hole 24. One end of the oil replenishing spring 11 abuts against the spring seat, and the other end abuts against the sealing sleeve 102. The sealing sleeve 102 has a protruding ring-shaped sealing protrusion 103 on the side facing the oil replenishing valve sleeve 12. The sealing protrusion 103 can abut against the end face of the oil replenishing valve sleeve 12 under the elastic force of the oil replenishing spring 11.

[0026] When the master cylinder is not braking, the piston 2 moves outward, the sealing gasket 4 blocks the oil filling hole 23 under the elastic force of the sealing spring 5, the pressure relief valve core 8 blocks the connection between side hole 1 25, side hole 26 and side hole 3 27 under the elastic force of the pressure relief spring 9, and the oil filling valve core 10 blocks the connection between side hole 1 25 and the brake chamber under the elastic force of the oil filling spring 11.

[0027] During braking, piston 2 moves inward, increasing the oil pressure in the replenishing chamber and the braking chamber. When the oil pressure in the replenishing chamber is greater than that in the braking chamber, it pushes the replenishing valve core 10 to overcome the elastic force of the replenishing spring 11, opening the axial hole 121, allowing oil in the replenishing chamber to replenish oil into the braking chamber. When the oil pressure in the replenishing chamber is greater than that in the inlet chamber, the oil pressure in the replenishing chamber acts on the pressure relief valve core 8, causing it to overcome the elastic force of the pressure relief spring 9, opening the side hole 27, and allowing oil in the replenishing chamber to drain into the inlet chamber through the side hole 26 and the side hole 27.

[0028] After braking, when piston 2 returns to its original position, the oil replenishment chamber increases in size and the oil pressure decreases. The oil pressure in the inlet chamber is higher than the oil pressure in the replenishment chamber. This oil pressure acts on gasket 2 7 and sealing gasket 4, causing them to overcome the elastic force of sealing spring 5 and move. The oil in the inlet chamber can then flow into the replenishment chamber through several replenishment holes 23, achieving one-way oil replenishment.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A booster brake master cylinder, comprising a pump body (1) and a cylindrical piston (2), one end of the piston (2) extending into the pump body (1), characterized in that, The piston (2) has two annular protrusions, shoulder 1 (21) and shoulder 2 (22), on its outer side. Shoulder 1 (21) and shoulder 2 (22) are spaced apart along the axial direction of the piston (2), and shoulder 2 (22) is closer to the other end of the piston (2) than shoulder 1 (21). Both shoulder 1 (21) and shoulder 2 (22) are fixed with annular seals (3), and the outer sides of both seals (3) abut against the inner wall of the pump body (1). 22) Several oil filling holes (23) are provided along the axial direction of the piston (2), and the oil filling holes (23) are distributed around the axis of the piston (2). A sealing gasket (4) and a sealing spring (5) in the shape of an annular shape are provided between the first shoulder (21) and the second shoulder (22). The sealing gasket (4) and the sealing spring (5) are both sleeved on the outside of the piston (2), and the sealing gasket (4) can move towards the second shoulder (22) under the elastic force of the sealing spring (5) and block all the above-mentioned oil filling holes (23).

2. The booster brake master cylinder according to claim 1, characterized in that, The piston (2) is also fitted with two annular gaskets, one (6) and the other (7), which are both circular. The first gasket (6) is located between the sealing spring (5) and the sealing gasket (4), and the second gasket (7) is located between the sealing gasket (4) and the second shoulder (22).

3. The booster brake master cylinder according to claim 2, characterized in that, The sealing gasket (4) has a strip groove (41) on the side facing the gasket (6). The length direction of the strip groove (41) is consistent with the radial direction of the sealing gasket (4). There is a gap between the inner wall of the sealing gasket (4) and the outer side of the piston (2).

4. The booster brake master cylinder according to claim 1, 2, or 3, characterized in that, The piston (2) has a recessed hole (24) at one end. A side hole (25), a side hole (26), and a side hole (27) communicating with the recessed hole (24) are provided on the side of the piston (2). The side holes (25), (26), and (27) are spaced apart along the axial direction of the piston (2). The side holes (25) and (26) are located between a shoulder (21) and a shoulder (22). The side hole (27) is located between the shoulder (22) and the shoulder (21). On the other side of 21), a pressure relief valve core (8) and a pressure relief spring (9) are provided in the recess (24). The end of the pressure relief valve core (8) facing the opening of the recess (24) is located between the first side hole (25) and the second side hole (26), and the outer side of the end of the pressure relief valve core (8) forms a seal with the side wall of the recess (24). The side of the pressure relief valve core (8) has a protruding sealing part (81) corresponding to the position of the third side hole (27), and the sealing part (81) can block the port of the third side hole (27).

5. The booster brake master cylinder according to claim 4, characterized in that, The recess (24) is also provided with an oil replenishing valve core (10), an oil replenishing spring (11), and an oil replenishing valve sleeve (12). The outer side of the oil replenishing valve sleeve (12) forms a seal with the side wall of the recess (24), and the seal is located between the side hole (25) and the opening of the recess (24). The end of the oil replenishing valve sleeve (12) facing the opening of the recess (24) has a recessed axial hole (121), and the side of the oil replenishing valve sleeve (12) is through-cut. There is a radial hole (122) that connects to the axial hole (121), and the radial hole (122) is located between the sealing position between the oil replenishing valve sleeve (12) and the concave hole (24) and the side hole (25). The oil replenishing valve core (10) is disposed between the oil replenishing valve sleeve (12) and the opening of the concave hole (24), and the oil replenishing valve core (10) can partially extend into the axial hole (121) and block the axial hole (121) under the elastic force of the oil replenishing spring (11).

6. The booster brake master cylinder according to claim 5, characterized in that, The oil replenishing valve core (10) includes a rod-shaped valve stem (101) and a sealing sleeve (102) sleeved and axially fixed to the outside of the valve stem (101). The sealing sleeve (102) has a protruding annular sealing protrusion (103) on the side facing the oil replenishing valve sleeve (12). The sealing protrusion (103) can abut against the oil replenishing valve sleeve (12) under the elastic force of the oil replenishing spring (11).

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