Brake master cylinder with oil supplementing valve

Abstract

The utility model provides a brake master cylinder with an oil supplementing valve, and belongs to the technical field of brake systems. The problem that an existing brake pump is low in response speed during continuous braking is solved. The brake master pump with the oil supplementing valve comprises a pump body and a piston, the pump body is provided with a cylindrical concave cavity, the inner end of the piston extends into the concave cavity, the outer end of the piston extends out of the pump body, the concave cavity is divided into an oil supply cavity and an oil outlet cavity by the piston, an oil supplementing cavity is further formed in the pump body and communicated with an inlet through an oil inlet hole, and the oil supplementing valve is arranged in the oil supplementing cavity. The oil supplementing cavity is communicated with the oil outlet cavity through the oil outlet hole, an oil supplementing valve element and an oil supplementing spring are arranged in the oil supplementing cavity, the oil supplementing valve element comprises a sealing sleeve and a rod-shaped oil supplementing rod, one end of the oil supplementing rod extends into the oil inlet hole, the sealing sleeve is fixedly arranged on the outer side of the other end of the oil supplementing rod in a sleeving mode, and the oil supplementing spring is arranged in the sealing sleeve. The sealing sleeve can abut against the end opening of the oil inlet hole under the elastic force effect of the oil supplementing spring and block the oil inlet hole. The brake master cylinder with the oil supplementing valve has the advantage of being high in response speed.

Description

Technical Field

[0001] The utility model belongs to the technical field of braking systems and relates to a master brake cylinder with an oil replenishing valve. Background Art

[0002] A brake pump is used to convert the mechanical energy input by a pedal mechanism into hydraulic energy to achieve braking, and is an important component in a vehicle braking system.

[0003] Generally, a brake pump includes a pump body, a piston disposed in the pump body, and a push rod. A leather cup is fixed to the outside of the piston, dividing the inside of the pump body into an oil supply chamber and an oil outlet chamber. During braking, the force of the pedal acts on the outer end of the push rod, pushing the piston to move inwards, squeezing the oil in the oil outlet chamber and outputting it to provide hydraulic energy for braking. After braking, the piston and the push rod reset. The oil in the oil supply chamber with a higher hydraulic pressure will supply oil to the oil outlet chamber through the leather cup to reduce the pressure difference between the oil supply chamber and the oil outlet chamber and assist the piston in resetting.

[0004] However, during the reset process of this brake pump, only the leather cup is relied on for oil replenishment. The oil replenishment speed is slow and the piston reset speed is slow, which is not conducive to improving the response speed of continuous braking. Summary of the Utility Model

[0005] The purpose of the present utility model is to address the above problems existing in the prior art and propose a master brake cylinder with an oil replenishing valve, which solves the problem of slow response speed during continuous braking of the existing brake pump.

[0006] The purpose of the present utility model can be achieved by the following technical solutions:

[0007] The master brake cylinder with an oil replenishing valve includes a pump body with an inlet and an outlet, and a piston. One end of the pump body has a recessed cylindrical cavity. The inner end of the piston extends into the cavity. A ring-shaped leather cup is fixed to the outside of the inner end of the piston. An annular cylinder sleeve is axially fixed in the opening end of the cavity of the pump body. The outer end of the piston passes through the cylinder sleeve and extends out of the pump body. It is characterized in that the piston divides the cavity into an oil supply chamber that can communicate with the inlet and an oil outlet chamber that communicates with the outlet. The pump body also has an oil replenishing chamber. The oil replenishing chamber is connected to the inlet through an oil inlet hole and is connected to the oil outlet chamber through an oil outlet hole. An oil replenishing valve core and an oil replenishing spring are arranged in the oil replenishing chamber. The oil replenishing valve core includes a sealing sleeve and a rod-shaped oil replenishing rod. One end of the oil replenishing rod extends into the oil inlet hole. The sealing sleeve is sleeved and fixed on the outside of the other end of the oil replenishing rod. The sealing sleeve can abut against the port of the oil inlet hole under the elastic force of the oil replenishing spring and block the oil inlet hole.

[0008] When the master brake cylinder with an oil replenishing valve works, the force of the pedal acts on the outer end of the piston, causing the piston to move inward. The inlet supplies oil to the oil supply chamber to provide assistance for the inward movement of the piston. At the same time, the piston compresses the oil outlet chamber, causing the oil in the oil outlet chamber to be output outward for braking. After braking is completed, the piston resets outward, compressing the oil supply chamber and stretching the oil outlet chamber. The pressure in the oil outlet chamber decreases, creating a pressure difference between the oil supply chamber and the oil outlet chamber. Under the action of the oil pressure at the inlet, the oil replenishing valve core compresses the oil replenishing spring and moves, canceling the blockage of the oil inlet hole. The oil at the inlet sequentially passes through the oil inlet hole, the oil replenishing chamber, and the oil outlet hole and enters the oil outlet chamber, replenishing the pressure in the oil outlet chamber, quickly reducing the pressure difference between the oil supply chamber and the oil outlet chamber, reducing the resistance for the rapid withdrawal of the piston, and improving the response speed of the brake pump for continuous braking.

[0009] In the above-mentioned master brake cylinder with an oil replenishing valve, two protruding annular limiting rings are provided on the outer side of the end of the oil replenishing rod away from the oil inlet hole. The two limiting rings are spaced apart. The sealing sleeve is in a cylindrical shape. The sealing sleeve is sleeved on the outer sides of the two limiting rings and partially embedded between the two limiting rings. One end of the sealing sleeve facing the oil inlet hole has a circular ring-shaped sealing portion protruding around the port of the oil inlet hole. The two annular limiting rings facilitate the fixation of the sleeved sealing sleeve, ensuring the stability and effectiveness of the sealing of the sealing portion.

[0010] In the above-mentioned master brake cylinder with an oil replenishing valve, the oil replenishing chamber is cylindrical. The oil inlet hole communicates with one end of the oil replenishing chamber. The other end of the oil replenishing chamber is open, and a plug is threadedly connected inside the pump body at this end of the oil replenishing chamber. The setting of the plug can not only facilitate the installation of the oil replenishing valve core and the oil replenishing spring, but also adjust the initial elastic force of the oil replenishing spring by adjusting the screwing depth to adapt to different oil replenishing requirements.

[0011] In the above-mentioned master brake cylinder with an oil replenishing valve, the oil outlet hole is opened on one side of the oil replenishing chamber. An air vent hole is penetrated through the side wall on the other side of the oil replenishing chamber, and a bleeder screw is threadedly connected to the pump body at the air vent hole. The bleeder screw is used to discharge the air in the oil replenishing chamber.

[0012] In the above-mentioned master brake cylinder with an oil replenishing valve, a gasket and a seal are provided at the end of the cylinder sleeve away from the opening of the concave cavity. The seal is located between the gasket and the cylinder sleeve. A ring-shaped snap ring fixed to the pump body is provided at the other end of the cylinder sleeve. One end of the cylinder sleeve facing the snap ring abuts against the snap ring. One end of the cylinder sleeve facing the seal presses the seal and the gasket tightly against the pump body. The inner side of the seal abuts against the outer side of the piston, and the outer side of the seal abuts against the inner wall of the pump body. The cylinder sleeve is fixed by relying on the snap ring, and at the same time, the sealing performance is ensured by the cylinder sleeve pressing tightly on the seal and the gasket.

[0013] In the above-mentioned master brake cylinder with a replenishing valve, a return spring and a spring seat are arranged in the oil outlet cavity. One end of the return spring abuts against the inner end of the piston, and the other end abuts against the spring seat. The return spring is relied on to move the piston inward and then reset it outward, and the spring seat is used to limit the radial position of the return spring.

[0014] In the above-mentioned master brake cylinder with a replenishing valve, the number of concave cavities and pistons in the pump body is two and they are arranged in one-to-one correspondence. A balance hole communicating the two concave cavities is opened between the side walls of the two concave cavities. Balance valve cores that can partially extend into the corresponding concave cavities are arranged at both ends of the balance hole. Cylindrical sleeves are fixed to the inner ends of the two pistons. When the pistons move inward, the sleeves can push the balance valve cores to retract into the balance hole and conduct the balance hole. The replenishing valve core structure in this master brake cylinder with a replenishing valve is applicable to a dual-chamber brake pump. Here, the dual-chamber brake pump is a prior art.

[0015] In the above-mentioned master brake cylinder with a replenishing valve, the sleeve and the piston are coaxially arranged. One end of the sleeve close to the piston has an inwardly protruding annular retaining edge. The sleeve is fixed to the inner end of the piston through a fastener passing through the retaining edge. An outwardly protruding annular convex ring is provided on the outer side of the inner end of the piston. The leather cup is fixed between the retaining edge and the convex ring. The arrangement of the retaining edge and the convex ring can not only limit the radial positions of the sleeve and the piston, but also provide support for the fixation of the leather cup.

[0016] In the above-mentioned master brake cylinder with a replenishing valve, there is a gap between the outer side of the sealing sleeve and the side wall of the replenishing cavity. The setting of this gap provides an oil passage for the oil flowing from the inlet to the outlet.

[0017] Compared with the prior art, during the process of the piston moving outward and resetting in this master brake cylinder with a replenishing valve, under the action of the oil pressure at the inlet, the replenishing valve core compresses the replenishing spring and moves, canceling the blockage of the oil inlet hole. The oil at the inlet sequentially passes through the oil inlet hole, the replenishing cavity and the oil outlet hole and enters the oil outlet cavity, replenishing the pressure in the oil outlet cavity, quickly reducing the pressure difference between the oil supply cavity and the oil outlet cavity, reducing the resistance for the piston to quickly withdraw, and improving the response speed of the continuous braking of the brake pump. Description of the Drawings

[0018] Figure 1 is a schematic cross-sectional structure view of this master brake cylinder with a replenishing valve.

[0019] In the figure, 1 is the pump body; 1a is the inlet; 1b is the outlet; 1c is the oil supply chamber; 1d is the oil outlet chamber; 1e is the oil replenishing chamber; 1f is the oil inlet hole; 1g is the oil outlet hole; 1h is the air vent hole; 1i is the balance hole; 1j is the concave cavity; 2 is the piston; 2a is the convex ring; 3 is the leather cup; 4 is the cylinder liner; 5 is the oil replenishing valve core; 5a is the sealing sleeve; 5a1 is the sealing part; 5b is the oil replenishing rod; 5b1 is the limit ring; 6 is the oil replenishing spring; 7 is the plug; 8 is the air vent screw; 9 is the gasket; 10 is the sealing element; 11 is the snap ring; 12 is the return spring; 13 is the spring seat; 14 is the balance valve core; 15 is the sleeve; 15a is the retaining edge. Detailed implementation mode

[0020] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0021] As Figure 1 shown, the master brake cylinder with an oil replenishing valve includes a pump body 1 having an inlet 1a and an outlet 1b and a cylindrical piston 2. One end of the pump body 1 has a recessed cylindrical concave cavity 1j. The inlet 1a is opened on one side of the opening end of the concave cavity 1j, and the outlet 1b is opened on the side of the other end of the concave cavity 1j. An annular cylinder liner 4 is axially fixed inside the opening end of the concave cavity 1j of the pump body 1. In this embodiment, the pump body 1 has a step at the opening end of the concave cavity 1j. A gasket 9 and a sealing element 10 both in the shape of a circular ring are provided at the end of the cylinder liner 4 away from the opening of the concave cavity 1j. The sealing element 10 is located between the gasket 9 and the cylinder liner 4. A circular snap ring 11 fixed to the pump body 1 is provided at the other end of the cylinder liner 4. One end of the cylinder liner 4 facing the snap ring 11 abuts against the snap ring 11. One end of the cylinder liner 4 facing the sealing element 10 presses the sealing element 10 and the gasket 9 tightly against the step of the pump body 1. The inner side of the sealing element 10 abuts against the outer side of the piston 2, and the outer side of the sealing element 10 abuts against the inner wall of the pump body 1.

[0022] The inner end of the piston 2 extends into the concave cavity 1j. A circular leather cup 3 is fixed to the outer side of the inner end of the piston 2, and the outer side of the leather cup 3 abuts against the side wall of the concave cavity 1j. The outer end of the piston 2 passes through the gasket 9, the sealing element 10 and the cylinder liner 4 and extends out of the pump body 1.

[0023] The piston 2 divides the concave cavity 1j into an oil supply cavity 1c that can communicate with the inlet 1a and an oil outlet cavity 1d that communicates with the outlet 1b. The oil supply cavity 1c and the oil outlet cavity 1d are arranged adjacent to each other. The pump body 1 also has an independent oil replenishing cavity 1e. The oil replenishing cavity 1e is communicated with the inlet 1a through an oil inlet hole 1f, and the oil replenishing cavity 1e is communicated with the oil outlet cavity 1d through an oil outlet hole 1g. An oil replenishing valve core 5 and an oil replenishing spring 6 are arranged in the oil replenishing cavity 1e. The oil replenishing valve core 5 includes a sealing sleeve 5a and an oil replenishing rod 5b in the shape of a round rod. One end of the oil replenishing rod 5b extends into the oil inlet hole 1f. The sealing sleeve 5a is sleeved and fixed on the outer side of the other end of the oil replenishing rod 5b. The sealing sleeve 5a can abut against the port of the oil inlet hole 1f under the elastic force of the oil replenishing spring 6 and block the oil inlet hole 1f. In this embodiment, two convex annular limiting rings 5b1 are provided on the outer side of the end of the oil replenishing rod 5b away from the oil inlet hole 1f. The two limiting rings 5b1 are arranged at intervals. The sealing sleeve 5a is in the shape of a round barrel. The sealing sleeve 5a is sleeved on the outer sides of the two limiting rings 5b1 and partially embedded between the two limiting rings 5b1. One end of the sealing sleeve 5a facing the oil inlet hole 1f has a circular sealing portion 5a1 protruding around the port of the oil inlet hole 1f. There is a gap between the outer side of the sealing sleeve 5a and the side wall of the oil replenishing cavity 1e.

[0024] The oil replenishing cavity 1e is cylindrical. The oil inlet hole 1f is opened at one end of the oil replenishing cavity 1e. The other end of the oil replenishing cavity 1e is open, and a plug 7 is threadedly connected inside the pump body 1 at this end of the oil replenishing cavity 1e. The oil outlet hole 1g is opened on one side of the oil replenishing cavity 1e. An air vent hole 1h is penetrated through the side wall on the other side of the oil replenishing cavity 1e, and a vent screw 8 is threadedly connected to the pump body 1 at the air vent hole 1h.

[0025] A return spring 12 and a spring seat 13 are arranged in the oil outlet cavity 1d. One end of the return spring 12 abuts against the inner end of the piston 2, and the other end abuts against the spring seat 13. The number of corresponding structures such as the concave cavity 1j and the piston 2 in the pump body 1 is two and they are arranged correspondingly. A balance hole 1i communicating the two concave cavities 1j is opened between the side walls of the two concave cavities 1j. Balance valve cores 14 that can partially extend into the corresponding concave cavities 1j are arranged at both ends of the balance hole 1i. Cylindrical sleeves 15 are fixedly arranged coaxially at the inner ends of the two pistons 2. When the piston 2 moves inwards, the sleeve 15 can push the balance valve core 14 into the balance hole 1i and conduct the balance hole 1i. In this embodiment, the sleeve 15 is coaxially arranged with the piston 2. One end of the sleeve 15 close to the piston 2 has an inwardly protruding circular retaining edge 15a. The sleeve 15 is fixed to the inner end of the piston 2 through a fastener passing through the retaining edge 15a. A circular convex ring 2a protrudes from the outer side of the inner end of the piston 2. The leather cup 3 is fixed between the retaining edge 15a and the convex ring 2a.

[0026] When the master brake cylinder with an oil replenishing valve is working, the force of the pedal acts on the outer end of piston 2, causing piston 2 to move inwards against the elastic force of the return spring. The inlet 1a supplies oil to the oil supply chamber 1c to provide assistance for the inward movement of piston 2. At the same time, piston 2 compresses the oil outlet chamber 1d, causing the oil in the oil outlet chamber 1d to be output externally for braking.

[0027] After braking is completed, piston 2 is reset outwards under the elastic force of the return spring 12, compressing the oil supply chamber 1c and stretching the oil outlet chamber 1d. The pressure in the oil outlet chamber 1d decreases, creating a pressure difference between the oil supply chamber 1c and the oil outlet chamber 1d. When this pressure difference continuously rises to be greater than the elastic force of the oil replenishing spring 6, the oil replenishing valve core 5 moves under the oil pressure at the inlet 1a, compressing the oil replenishing spring 6, canceling the blockage of the oil inlet hole 1f. The oil at the inlet 1a sequentially passes through the oil inlet hole 1f, the oil replenishing chamber 1e, and the oil outlet hole 1g and enters the oil outlet chamber 1d to supplement the pressure in the oil outlet chamber 1d, rapidly reducing the pressure difference between the oil supply chamber 1c and the oil outlet chamber 1d.

[0028] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A brake master cylinder with an oil replenishing valve, comprising a pump body (1) having an inlet (1a) and an outlet (1b) and a piston (2), wherein one end of the pump body (1) has a concave cylindrical cavity (1j), the inner end of the piston (2) extends into the cavity (1j), an annular leather cup (3) is fixed to the outer side of the inner end of the piston (2), an annular cylinder sleeve (4) is axially fixed to the open end of the pump body (1) located in the cavity (1j), the outer end of the piston (2) passes through the cylinder sleeve (4) and extends out of the pump body (1), and is characterized in that: The piston (2) divides the concave cavity (1j) into an oil supply cavity (1c) that can communicate with the inlet (1a) and an oil outlet cavity (1d) that communicates with the outlet (1b). The pump body (1) further has a supplementary oil cavity (1e). The supplementary oil cavity (1e) communicates with the inlet (1a) through an oil inlet hole (1f), and the supplementary oil cavity (1e) communicates with the oil outlet cavity (1d) through an oil outlet hole (1g). A supplementary oil valve core (5) and a supplementary oil spring (6) are arranged in the supplementary oil cavity (1e). The supplementary oil valve core (5) includes a sealing sleeve (5a) and a rod-shaped supplementary oil rod (5b). One end of the supplementary oil rod (5b) extends into the oil inlet hole (1f), and the sealing sleeve (5a) is sleeved and fixed on the outer side of the other end of the supplementary oil rod (5b). The sealing sleeve (5a) can be abutted against the port of the oil inlet hole (1f) under the elastic force of the supplementary oil spring (6) to block the oil inlet hole (1f).

2. The master brake cylinder with a supplementary oil valve according to claim 1, wherein, On the outer side of the end of the supplementary oil rod (5b) away from the oil inlet hole (1f), there are two protruding annular limiting rings (5b1). The two limiting rings (5b1) are arranged at intervals. The sealing sleeve (5a) is in a cylindrical shape. The sealing sleeve (5a) is sleeved on the outer sides of the two limiting rings (5b1) and partially embedded between the two limiting rings (5b1). One end of the sealing sleeve (5a) facing the oil inlet hole (1f) has a circular ring-shaped sealing part (5a1) protruding around the port of the oil inlet hole (1f).

3. The master brake cylinder with a supplementary oil valve according to claim 1 or 2, characterized in that, The supplementary oil cavity (1e) is cylindrical. The oil inlet hole (1f) communicates with one end of the supplementary oil cavity (1e). The other end of the supplementary oil cavity (1e) is open, and a plug (7) is internally threaded and connected to the pump body (1) at this end of the supplementary oil cavity (1e).

4. The master brake cylinder with a supplementary oil valve according to claim 3, characterized in that, The oil outlet hole (1g) is opened on one side of the supplementary oil cavity (1e). An air vent hole (1h) is penetrated and opened on the side wall of the other side of the supplementary oil cavity (1e). A vent screw (8) is threaded and connected to the pump body (1) at the air vent hole (1h).

5. The master brake cylinder with a supplementary oil valve according to claim 1 or 2, characterized in that At one end of the cylinder liner (4) away from the opening of the concave cavity (1j), there are a gasket (9) and a seal (10) both in a circular ring shape. The seal (10) is located between the gasket (9) and the cylinder liner (4). At the other end of the cylinder liner (4), there is a ring-shaped snap ring (11) fixed to the pump body (1). One end of the cylinder liner (4) facing the snap ring (11) abuts against the snap ring (11). One end of the cylinder liner (4) facing the seal (10) presses the seal (10) and the gasket (9) tightly against the pump body (1). The inner side of the seal (10) abuts against the outer side of the piston (2), and the outer side of the seal (10) abuts against the inner wall of the pump body (1).

6. The brake master cylinder with an oil replenishment valve according to claim 1 or 2, characterized in that: A return spring (12) and a spring seat (13) are arranged in the oil outlet cavity (1d). One end of the return spring (12) abuts against the inner end of the piston (2), and the other end abuts against the spring seat (13).

7. The master brake cylinder with an oil replenishing valve according to claim 1 or 2, characterized in that, The number of the concave cavities (1j) and the number of the pistons (2) in the pump body (1) are both two and they are arranged in a one-to-one correspondence. A balancing hole (1i) is provided between the side walls of the two concave cavities (1j) to connect the two concave cavities (1j). Both ends of the balancing hole (1i) are provided with a balancing valve core (14) that can partially extend into the corresponding concave cavity (1j). The inner ends of the two pistons (2) are fixed with a cylindrical sleeve (15). When the pistons (2) move inward, the sleeve (15) can push the balancing valve core (14) to retract into the balancing hole (1i) and connect the balancing hole (1i).

8. The brake master cylinder with an oil replenishment valve according to claim 7, characterized in that: The sleeve (15) is coaxially arranged with the piston (2), and the end of the sleeve (15) close to the piston (2) has a retaining edge (15a) protruding inward in the form of a circular ring. The sleeve (15) is fixed to the inner end of the piston (2) by a fastener passing through the retaining edge (15a). The outer side of the inner end of the piston (2) has a convex ring (2a) protruding in the form of a circular ring, and the leather cup (3) is fixed between the retaining edge (15a) and the convex ring (2a).

9. The master brake cylinder with a supplementary oil valve according to claim 1 or 2, characterized in that, There is a gap between the outer side of the sealing sleeve (5a) and the side wall of the oil replenishing chamber (1e).

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