Brake master cylinder

Abstract

The utility model provides a brake master cylinder, and belongs to the technical field of brake equipment. The problem that an existing brake master cylinder is low in continuous braking response speed is solved. The brake master pump comprises a pump body and a columnar piston, a concave hole is formed in the end portion of the inner end of the piston, a first side hole, a second side hole and a third side hole are formed in the side wall of the concave hole in the radial direction in a penetrating mode, and an oil supplementing spring, a cylindrical oil supplementing valve element, a pressure relief valve element and a pressure relief spring are sequentially arranged in the concave hole in the direction from a brake cavity to an oil inlet cavity. The pressure relief valve element can move under the elastic action of the pressure relief spring, the end, facing the pressure relief valve element, of the oil supplementing valve element is located between the first side hole and the second side hole, sealing is formed between the outer side of the end and the side wall of the concave hole, an annular protruding shoulder is further arranged on the inner wall of the concave hole, and the first side hole is located between the protruding shoulder and the second side hole. The oil supplementing valve element can abut against the convex shoulder under the elastic force effect of the oil supplementing spring to form sealing. The brake master cylinder has the advantage of high continuous brake response speed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to brake equipment technical field relates to a brake master cylinder. BACKGROUND

[0002] Among the existing large oil volume brake master cylinder, one is that the piston separates the brake master pump inner cavity into brake cavity, oil supplement cavity and oil inlet cavity in turn, the cross section area of brake cavity is less than that of oil inlet cavity. However, in the actual braking process of the brake master pump, with the piston pushing inward, the oil supplement speed of the oil supplement cavity to the brake cavity is slow, which leads to the continuous rise of the oil pressure in the oil supplement cavity, causing great resistance to the movement of the piston and push rod, which is not conducive to braking.

[0003] Therefore, the applicant designs a booster master cylinder and applies for a Chinese patent, the application number of which is: 202210247470.2; the publication number of which is: CN114475547A; the booster master cylinder comprises a pump body and a piston assembly arranged in the pump body, the pump body inner cavity is separated into a brake cavity, an oil supplement cavity and an oil inlet cavity by the piston assembly, a sealing element allowing oil to flow unidirectionally to the brake cavity is connected to the piston assembly between the brake cavity and the oil supplement cavity, the pump body side has an oil inlet port communicating with the oil inlet cavity, the pump body also has an adjusting cavity with an adjusting valve core and an elastic element arranged therein, the adjusting cavity communicates with the brake cavity, the oil supplement cavity and the oil inlet port respectively, the adjusting valve core can block the communication between the oil supplement cavity and the oil inlet port under the elastic force of the elastic element, and the adjusting valve core can move to connect the oil supplement cavity and the oil inlet port under the oil pressure of the brake cavity. In the booster master cylinder, the adjusting cavity, the adjusting valve core and the elastic element in the adjusting cavity are used for pressure relief, the oil in the oil supplement cavity is quickly discharged to the oil inlet port, and the braking resistance is reduced.

[0004] However, after braking is completed, the piston is reset, and the oil in the brake cavity is supplemented only by the oil supplement cavity through the one-way sealing sealing element, so the oil supplement speed is slow, which is not conducive to improving the response speed of continuous braking. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above problems existing in the prior art, and provides a brake master cylinder, which solves the problem of slow response speed of continuous braking of the existing brake master cylinder.

[0006] The utility model can be realized by the following technical schemes.

[0007] The utility model provides a brake master cylinder, including the pump body and the piston of column shape, the piston inner end stretches into the pump body and will divide out brake chamber, oil supplement chamber and oil inlet chamber in turn in the pump body, its characterized in being that the end of the piston inner end is equipped with the recessed hole, the side wall on the recessed hole is equipped with side hole no.

[0008] The utility model discloses a brake master cylinder, including the pump body and the piston of column shape, the piston inner end stretches into the pump body and will divide out brake chamber, oil supplement chamber and oil inlet chamber in turn in the pump body, its characterized in being that the end of the piston inner end is equipped with the recessed hole, the side wall on the recessed hole is equipped with side hole no.

[0009] In the working process of the brake master cylinder, the oil in the oil supplement chamber can be discharged during braking to reduce resistance, and the brake chamber can be quickly supplemented with liquid during piston reset, so that the braking and reset processes are more labor-saving and faster, and the response speed of the brake master cylinder during continuous braking is improved.

[0010] In the above-mentioned brake master cylinder, the outer side of the oil supplement valve core has a protruding annular oil supplement sealing part that can abut against the end face of the shoulder and form a seal. The protruding oil supplement sealing part forms a seal with the shoulder, and the sealing stability is good.

[0011] In the above-mentioned brake master cylinder, the recessed hole of the piston further axially fixedly has an annular limiting seat, the limiting seat is arranged between the oil supplement spring and the opening end of the recessed hole, one end of the oil supplement spring abuts against the limiting seat, and the other end abuts against the oil supplement valve core. The annular limiting seat facilitates the passage of oil while providing elastic support for the oil supplement spring.

[0012] In the above-mentioned brake master cylinder, the other end of the pressure relief valve core outside the recessed hole forms a seal with the side wall of the recessed hole, and the other end of the pressure relief valve core has a protruding annular pressure relief sealing part, the pressure relief sealing part is located between the side hole two and the side hole three, and the pressure relief sealing part forms a seal with the side wall of the recessed hole. The pressure relief valve core relies on the protruding annular pressure relief sealing part to realize sealing, so that other positions of the pressure relief valve core can form gaps with the side wall of the recessed hole for the passage of oil, without the need to additionally open oil holes, not only the sealing effect is good, but also the production and processing are convenient.

[0013] In the above-mentioned brake master cylinder, the piston includes a cylindrical split body one, a cylindrical split body two, and a cylindrical split body three, the split body two is arranged in the split body one, the inner end of the split body three abuts against the split body one and the split body two, and the outer end of the split body three extends out of the pump body, and the end of the split body two away from the split body three forms the above-mentioned shoulder, and the pressure relief valve core is arranged in the split body two. The piston is divided into three parts, which not only facilitates the machining and formation of the shoulder and other structures, but also facilitates the installation of various components in the piston.

[0014] In the brake master cylinder, the side hole one, the side hole two and the side hole three are all through the side of the second part, the oil gap one and the oil gap two are formed between the inner side of the first part and the outer side of the second part, the oil gap one is communicated with the side hole one and the side hole two, the radial hole one is through the side of the first part and communicated with the oil gap one and the oil supplement cavity, the oil gap two is communicated with the side hole three, the radial hole two is through the side of the first part and communicated with the oil supplement cavity and the oil gap two.

[0015] In the brake master cylinder, the side hole one, the side hole two and the side hole three are all through the side of the second part, the oil gap one and the oil gap two are formed between the inner side of the first part and the outer side of the second part, the oil gap one is communicated with the side hole one and the side hole two, the radial hole one is through the side of the first part and communicated with the oil gap one and the oil supplement cavity, the oil gap two is communicated with the side hole three, the radial hole two is through the side of the first part and communicated with the oil supplement cavity and the oil gap two.

[0016] Compared with the prior art, in the working process of the brake master cylinder, the oil in the oil supplement cavity can be discharged to reduce the resistance during braking, and the brake chamber can be quickly supplemented with liquid during the reset of the piston, so that the braking and reset processes are more labor-saving and faster, and the response speed of the brake master cylinder during continuous braking is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a sectional view of the brake master cylinder.

[0018] In the figure, 1 is a pump body, 1a is a brake chamber, 1b is an oil supplement cavity, 1c is an oil inlet cavity, 1d is an oil outlet, 1e is an oil inlet, 2 is a piston, 2a is a concave hole, 2b is a side hole one, 2c is a side hole two, 2d is a side hole three, 2e is a shoulder, 2f is a first part, 2g is a second part, 2h is a third part, 2i is an oil gap one, 2j is an oil gap two, 2k is a radial hole one, 2l is a radial hole two, 3 is an oil supplement spring, 4 is an oil supplement valve core, 4a is an oil supplement sealing part, 5 is a pressure relief valve core, 5a is a pressure relief sealing part, 6 is a pressure relief spring, 7 is a limiting seat, 8 is a spring seat, 9 is a reset spring, and 10 is a one-way valve. DETAILED DESCRIPTION

[0019] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0020] AsFigure 1 As shown, the brake master cylinder comprises a pump body 1 having an oil inlet 1e and an oil outlet 1d, and a piston 2 in the shape of a cylinder, an annular cup is fixed to the outer side of the piston 2, the inner end of the piston 2 extends into the pump body 1, and an annular cup is fixed to the inner wall of the pump body 1, the two cups sequentially separate the brake chamber 1a, the oil supplement chamber 1b and the oil inlet chamber 1c in the pump body 1, the oil outlet 1d is communicated with the brake chamber 1a, and the oil inlet 1e is communicated with the oil inlet chamber 1c. A cylindrical spring seat 8 is arranged around the oil outlet 1d in the brake chamber 1a, and a return spring 9 is further arranged in the pump body 1, one end of the return spring 9 abuts against the spring seat 8, and the other end abuts against the piston 2, and a one-way valve 10 is arranged in the spring seat 8 to enable the oil in the brake chamber 1a to flow out of the pump body 1.

[0021] For the convenience of structural description, the following is described taking the direction shown in the drawings as an example.

[0022] The end of the left end of the piston 2 has an axially recessed recess hole 2a, a side hole one 2b, a side hole two 2c and a side hole three 2d are radially and throughly arranged on the side wall of the recess hole 2a, and the side hole one 2b, the side hole two 2c and the side hole three 2d are sequentially distributed from left to right. The side hole one 2b and the side hole two 2c are both communicated with the oil supplement chamber 1b and the recess hole 2a, and the side hole three 2d is communicated with the oil inlet chamber 1c and the recess hole 2a, and an oil supplement spring 3, a cylindrical oil supplement valve core 4, a pressure relief valve core 5 and a pressure relief spring 6 are sequentially arranged in the recess hole 2a from left to right.

[0023] Among them, a limiting seat 7 in the shape of a circular ring is axially fixed to the position close to the left opening end in the recess hole 2a by a snap ring, one end of the oil supplement spring 3 abuts against the limiting seat 7, and the other end abuts against the oil supplement valve core 4. The recess hole 2a further has a convex shoulder 2e in the shape of a circular ring on the inner wall, and the convex shoulder 2e is located to the left of the side hole one 2b, the right end of the oil supplement valve core 4 penetrates into the convex shoulder 2e, and the outer side of the end of the right end is fixed with a circular ring O-shaped ring forming a seal with the side wall of the recess hole 2a, and the O-shaped ring is located between the side hole one 2b and the side hole two 2c. The outer side of the left end of the oil supplement valve core 4 has an oil supplement sealing part 4a in the shape of a circular ring, which can abut against the end face of the convex shoulder 2e and form a seal. In this embodiment, the oil supplement sealing part 4a is a sealing ring in the shape of a circular ring which is sleeved and axially fixed to the outer side of the left end of the oil supplement valve core 4.

[0024] The pressure relief valve core 5 is cylindrical, and the left end of the pressure relief valve core 5 is located between the side hole one 2b and the side hole two 2c, and the outer side of the left end of the pressure relief valve core 5 is fixed with an O-shaped ring which is circular, and the O-shaped ring is always in contact with the side wall of the concave hole 2a and forms a seal. The outer side of the right end of the pressure relief valve core 5 has a protruding circular relief sealing part 5a, which is located between the side hole two 2c and the side hole three 2d, and a seal is formed between the relief sealing part 5a and the side wall of the concave hole 2a. In this embodiment, the relief sealing part 5a includes two sealing rings which are circular and are sleeved on the outer side of the right end of the pressure relief valve core 5, and under the elastic force of the pressure relief spring 6, the two sealing rings are moved to between the side hole two 2c and the side hole three 2d.

[0025] The piston 2 includes a cylindrical part one 2f, a cylindrical part two 2g, and a cylindrical part three 2h, the cylindrical part two 2g is arranged in the cylindrical part one 2f, the left end of the cylindrical part three 2h is in contact with the right end of the cylindrical part one 2f and the right end of the cylindrical part two 2g at the same time, and the cylindrical part two 2g is axially positioned in the cylindrical part one 2f, the right end of the cylindrical part three 2h extends out of the pump body 1, the left end of the cylindrical part two 2g forms the shoulder 2e, and the pressure relief valve core 5 is arranged in the cylindrical part two 2g.

[0026] The side hole one 2b, the side hole two 2c, and the side hole three 2d are all arranged on the side of the cylindrical part two 2g. The outer sides of the two ends of the cylindrical part two 2g are both provided with O-shaped rings which are in contact with the inner wall of the cylindrical part one 2f, and an oil passing gap one 2i is formed between the two O-shaped rings, the oil passing gap one 2i is connected with the side hole one 2b and the side hole two 2c at the same time, and a radial hole one 2k is arranged on the side of the cylindrical part one 2f and is connected with the oil passing gap one 2i and the oil supplement cavity 1b. The outer side of the right end of the cylindrical part two 2g is connected with the oil passing gap two 2j which is independent of the oil passing gap one 2i, and the oil passing gap two 2j is connected with the side hole three 2d, and a radial hole two 2l is arranged on the side of the cylindrical part one 2f and is connected with the oil inlet cavity 1c and the oil passing gap two 2j.

[0027] When the brake master cylinder is not braking, the oil supplement valve core 4 is in contact with the shoulder 2e under the elastic force of the oil supplement spring 3, and a seal is formed between the outer side of the right end of the oil supplement valve core 4 and the side wall of the concave hole 2a, which seals the left and right sides of the side hole one 2b, and blocks the side hole one 2b and the brake cavity 1a and the side hole one 2b and the oil inlet cavity 1c. At the same time, the left end of the pressure relief valve core 5 separates the side hole one 2b and the side hole two 2c, and the right end of the pressure relief sealing part 5a blocks the side hole two 2c and the side hole three 2d, that is, the oil supplement cavity 1b, the brake cavity 1a, and the oil inlet cavity 1c are kept in a blocked state under the action of the oil supplement valve core 4 and the pressure relief valve core 5 when the brake master cylinder is not braking or is normally working.

[0028] When braking, the piston 2 moves left, extruding the oil in the brake chamber 1a, opening the one-way valve 10 and outputting to realize braking, at the same time, the oil pressure in the oil supplement chamber 1b rises. When the pressure difference between the oil pressure in the brake chamber 1a and the oil inlet chamber 1c rises to exceed the elastic force of the pressure relief spring 6, the oil pressure in the brake chamber 1a acts on the left end of the pressure relief valve core 5 through the recess 2a and the inner hole of the cylindrical oil supplement valve core 4, pushes the pressure relief valve core 5 to move right to overcome the elastic force of the pressure relief spring 6, so that the side hole two 2c and the side hole three 2d are connected through the recess 2a, then the oil in the oil supplement chamber 1b is discharged to the oil inlet chamber 1c through the side hole two 2c, the recess 2a and the side hole three 2d in sequence, reducing the resistance of the piston 2 moving inwards. At this time, the left end of the pressure relief valve core 5 still keeps in abutting sealing with the side wall of the recess 2a, separating the side hole two 2c and the brake chamber 1a.

[0029] After braking, the piston 2 is reset right under the elastic force of the reset spring 9, the oil pressure in the brake chamber 1a rapidly decreases, when the pressure difference between the oil pressure in the oil supplement chamber 1b and the oil pressure in the brake chamber 1a exceeds the elastic force of the oil supplement spring 3, the oil in the oil supplement chamber 1b acts on the oil supplement valve core 4, so that the oil supplement valve core 4 compresses the oil supplement spring 3 to move left, leaving the convex shoulder 2e, the oil in the oil supplement chamber 1b flows to the brake chamber 1a through the side hole one 2b and the recess 2a, realizing rapid oil supplement.

[0030] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A brake master cylinder comprising a cylinder (1) and a cylindrical piston (2) which extends into the cylinder (1) and divides the cylinder (1) into a brake chamber (la), an oil compensation chamber (lb) and an oil inlet chamber (lc) in that order, characterized in that, A concave hole (2a) is provided at the inner end of the piston (2), and a side hole one (2b), a side hole two (2c) and a side hole three (2d) are radially penetrated on the side wall of the concave hole (2a). The side hole one (2b), the side hole two (2c) and the side hole three (2d) are sequentially distributed along the direction from the brake chamber (1a) to the oil inlet chamber (1c). The side hole one (2b) and the side hole two (2c) are both connected to the oil replenishment chamber (1b) and the concave hole (2a), and the side hole three (2d) is connected to the oil inlet chamber (1c) and the concave hole (2a). An oil replenishment spring (3), a cylindrical oil replenishment valve core (4), and a side wall of the concave hole (2a) between the side hole two (2c) and the brake chamber (1a) are sequentially provided in the concave hole (2a) from the brake chamber (1a) to the oil inlet chamber (1c). The invention relates to a pressure relief valve core (5) and a pressure relief spring (6) that form a seal. The pressure relief valve core (5) can move under the elastic force of the pressure relief spring (6), and the outer side of the pressure relief valve core (5) can form a seal with the side wall of the concave hole (2a) between the side hole 2 (2c) and the side hole 3 (2d). One end of the oil replenishing valve core (4) facing the pressure relief valve core (5) is located between the side hole 1 (2b) and the side hole 2 (2c), and the outer side of the end forms a seal with the side wall of the concave hole (2a). The inner wall of the concave hole (2a) also has a protruding annular shoulder (2e). The above-mentioned side hole 1 (2b) is located between the shoulder (2e) and the side hole 2 (2c). The oil replenishing valve core (4) can abut against the shoulder (2e) under the elastic force of the oil replenishing spring (3) and form a seal.

2. A master cylinder according to claim 1, wherein The outer side of the oil replenishing valve core (4) has a protruding annular oil replenishing sealing portion (4a), and the oil replenishing sealing portion (4a) can abut against the end surface of the shoulder (2e) and form a seal.

3. A master cylinder according to claim 1 or 2, characterised in that An annular limit seat (7) is axially fixed in the concave hole (2a) of the piston (2). The limit seat (7) is arranged between the oil replenishing spring (3) and the open end of the concave hole (2a). One end of the oil replenishing spring (3) abuts against the limit seat (7), and the other end abuts against the oil replenishing valve core (4).

4. A master cylinder according to claim 1 or 2, characterised in that A seal is formed between the outer side of one end of the pressure relief valve core (5) facing the oil replenishment valve core (4) and the side wall of the concave hole (2a), and a protruding annular pressure relief sealing portion (5a) is provided on the outer side of the other end of the pressure relief valve core (5). The pressure relief sealing portion (5a) is located between the second side hole (2c) and the third side hole (2d), and a seal is formed between the pressure relief sealing portion (5a) and the side wall of the concave hole (2a).

5. A master cylinder according to claim 1 or 2, wherein The piston (2) includes a cylindrical split body 1 (2f), a cylindrical split body 2 (2g), and a columnar split body 3 (2h). The split body 2 (2g) is inserted into the split body 1 (2f). The inner end of the split body 3 (2h) abuts against the split body 1 (2f) and the split body 2 (2g). The outer end of the split body 3 (2h) extends out of the pump body (1). The end of the split body 2 (2g) away from the split body 3 (2h) forms the above-mentioned convex shoulder (2e). The pressure relief valve core (5) is inserted into the split body 2 (2g).

6. A master cylinder according to claim 5, wherein The side hole one (2b), the side hole two (2c) and the side hole three (2d) are all through the side of the split body two (2g), the split body one (2f) and the split body two (2g) form the oil gap one (2i) and the oil gap two (2j) which are independent of each other, the oil gap one (2i) is communicated with the side hole one (2b) and the side hole two (2c), the side of the split body one (2f) is radially through the radial hole one (2k) which connects the oil gap one (2i) and the oil cavity (1b), the oil gap two (2j) is communicated with the side hole three (2d), the side of the split body one (2f) is radially through the radial hole two (2l) which connects the oil cavity (1c) and the oil gap two (2j).

7. A master cylinder according to claim 1 or 2, wherein The pump body (1) is through the oil outlet (1d) which is communicated with the brake cavity (1a) and the outside of the pump body (1), the spring seat (8) which is cylindrical is set around the oil outlet (1d) in the brake cavity (1a), the reset spring (9) is also set in the pump body (1), one end of the reset spring (9) abuts on the spring seat (8), the other end abuts on the piston (2), the one-way valve (10) which can make the oil in the brake cavity (1a) flow out of the pump body (1) is set in the spring seat (8).

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