Semi-plunger brake master cylinder
By setting a concave hole and a pressure relief core inside the brake master cylinder piston, the connection between oil chamber two and oil chamber three is achieved, solving the problem of oil pressure resistance to the piston in oil chamber two and achieving a more effortless braking effect.
Patent Information
- Application Number
- CN202423174545.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In existing brake master cylinders, the oil pressure in the second oil chamber exerts significant resistance on the piston, resulting in an unsmooth braking process.
A semi-plunger brake master cylinder was designed, which uses a piston with a concave hole and a pressure relief core. The concave hole is equipped with a pressure relief spring and a pressure relief core. The pressure relief core overcomes the spring force under the action of oil pressure to realize the connection between oil chamber two and oil chamber three, thereby reducing the oil pressure in oil chamber two.
This effectively reduces the oil pressure in the second oil chamber, decreases the braking resistance on the piston, and makes the braking process easier.
Smart Images
Figure CN223456923U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to brake device technical field relates to a half plunger brake master cylinder. BACKGROUND
[0002] Vehicle brake pump is one of the core components in the whole automobile brake system, and 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 brake of each wheel through oil, so as to realize the deceleration or stop of the vehicle.
[0003] In the existing large displacement brake master cylinder, one of them is divided into three independent oil chambers in turn by the piston and the outer side of the skin bowl, which can be named as oil chamber one, oil chamber two and oil chamber three in turn, wherein the cross-sectional area of the oil chamber one is smaller than that of the oil chamber three connected with the inlet of the brake master cylinder. During the movement of the piston to the brake master cylinder, the oil pressure in the oil chamber one and the oil chamber two will rise rapidly, and the oil output in the oil chamber one provides sufficient hydraulic energy for the brake at each wheel. When the oil pressure in the oil chamber two is higher than that in the oil chamber one, the skin bowl between the oil chamber one and the oil chamber two can be deformed under the pressure difference between them, so that the oil in the oil chamber two is supplemented to the oil chamber one through the skin bowl on the piston, and the oil pressure in the oil chamber one is ensured.
[0004] However, during the braking process, with the inward pushing of the piston, the oil chamber two only supplements the oil to the oil chamber one through the deformation of the skin bowl, and the oil supplementing speed is slow, which leads to the continuous rise of the oil pressure in the oil chamber two and causes great resistance to the movement of the piston, which is not conducive to braking.
[0005] Therefore, it is very important to reduce the oil pressure of the oil chamber two during braking. UTILITY MODEL CONTENTS
[0006] The utility model discloses a half plunger brake master cylinder, and solves the problem that the oil pressure of the oil chamber two in the existing brake master cylinder exerts great braking resistance on the piston.
[0007] The purpose of the utility model can be realized through the following technical schemes:
[0008] The semi-piston brake master cylinder comprises a pump body with an inlet and an outlet and a piston in a column shape, the inner end of the piston extends into the pump body and sequentially separates the pump body into oil chamber one, oil chamber two and oil chamber three, the oil chamber one is communicated with the outlet, and the oil chamber three is communicated with the inlet, characterized in that the inner end of the piston is provided with a concave hole, and a relief spring and a relief core in a column shape are arranged in the concave hole, a side hole one communicated with the oil chamber two and the concave hole and a side hole two communicated with the oil chamber three and the concave hole are through in the side wall of the concave hole, the side hole one is located between the concave hole opening end and the side hole two, one end of the relief core is located between the side hole one and the concave hole opening end, and the outer side of the end of the relief core and the side wall of the concave hole form a seal, the outer side of the other end of the relief core has a convex annular sealing part which abuts against the side wall of the concave hole and forms a seal, the sealing part can move between the side hole one and the side hole two under the elastic force of the relief spring, and the relief core can overcome the elastic force of the relief spring and move the sealing part under the oil pressure in the oil chamber one to make the side hole one and the side hole two communicated through the concave hole.
[0009] When not working, one end of the relief core is located between the side hole one and the concave hole opening end and forms a seal, so that the oil chamber two cannot be communicated with the oil chamber one through the side hole one and the concave hole, at the same time, the sealing part of the relief core moves to between the side hole one and the side hole two and forms a seal with the side wall of the concave hole under the elastic force of the relief spring, so that the oil chamber two and the oil chamber three cannot be communicated through the side hole one, the concave hole and the side hole two. That is, the oil chamber one, the oil chamber two and the oil chamber three remain independent and not communicated with each other.
[0010] When braking, the outer end of the piston moves into the pump body under the action force of the pedal, extruding the oil liquid in the oil chamber one and the oil chamber two, so that the oil pressure in the oil chamber one and the oil chamber two rises, the oil liquid in the oil chamber one is sent out through the outlet to provide hydraulic energy for braking, and the oil pressure in the oil chamber two can supply oil to the oil chamber two in one way when it exceeds the oil pressure in the oil chamber one. When the oil pressure in the oil chamber one and the oil chamber two is too high, the oil pressure in the oil chamber one acts on the relief core to make the relief core move against the elastic force of the relief spring, and the side hole one and the side hole two are communicated through the concave hole, so that the oil liquid in the oil chamber two flows to the oil chamber three through the side hole one, the concave hole and the side hole two in sequence to complete the oil discharge, reduce the oil pressure in the oil chamber two and the braking resistance of the piston, so that the braking is more relaxed.
[0011] In the semi-plunger brake master cylinder, the piston has a protruding annular portion on the inner wall of the concave hole, and the inner side of the protruding annular portion has a protruding annular stopper, one end of the pressure relief core is inserted into the protruding annular portion under the elastic force of the pressure relief spring and abuts against the end face of the stopper, the inner side of the protruding annular portion is a cylindrical surface, and the outer side of one end of the pressure relief core is fixed with a ring-shaped sealing element which abuts against the inner side wall of the protruding annular portion and forms a seal. The protruding annular portion and the stopper limit the radial and axial positions of the pressure relief core and realize the seal between the pressure relief core and the piston, so that the operation of the pressure relief core is more stable.
[0012] In the semi-plunger brake master cylinder, the piston has a protruding annular portion on the inner wall of the concave hole, and the inner side of the protruding annular portion has a protruding annular stopper, one end of the pressure relief core is inserted into the protruding annular portion under the elastic force of the pressure relief spring and abuts against the end face of the stopper, the inner side of the protruding annular portion is a cylindrical surface, and the outer side of one end of the pressure relief core is fixed with a ring-shaped sealing element which abuts against the inner side wall of the protruding annular portion and forms a seal. The protruding annular portion and the stopper limit the radial and axial positions of the pressure relief core and realize the seal between the pressure relief core and the piston, so that the operation of the pressure relief core is more stable.
[0013] In the semi-plunger brake master cylinder, the piston has a protruding annular portion on the inner wall of the concave hole, and the inner side of the protruding annular portion has a protruding annular stopper, one end of the pressure relief core is inserted into the protruding annular portion under the elastic force of the pressure relief spring and abuts against the end face of the stopper, the inner side of the protruding annular portion is a cylindrical surface, and the outer side of one end of the pressure relief core is fixed with a ring-shaped sealing element which abuts against the inner side wall of the protruding annular portion and forms a seal. The protruding annular portion and the stopper limit the radial and axial positions of the pressure relief core and realize the seal between the pressure relief core and the piston, so that the operation of the pressure relief core is more stable.
[0014] In the semi-plunger brake master cylinder, the piston has a protruding annular portion on the inner wall of the concave hole, and the inner side of the protruding annular portion has a protruding annular stopper, one end of the pressure relief core is inserted into the protruding annular portion under the elastic force of the pressure relief spring and abuts against the end face of the stopper, the inner side of the protruding annular portion is a cylindrical surface, and the outer side of one end of the pressure relief core is fixed with a ring-shaped sealing element which abuts against the inner side wall of the protruding annular portion and forms a seal. The protruding annular portion and the stopper limit the radial and axial positions of the pressure relief core and realize the seal between the pressure relief core and the piston, so that the operation of the pressure relief core is more stable.
[0015] As another case, in the above-mentioned half-plunger brake master cylinder, the oil cavity one is further provided with a limiting sleeve one and a limiting sleeve two which are both in the shape of a cone, and a limiting rod which is in the shape of a long pole, both ends of the limiting rod are respectively inserted into the limiting sleeve one and the limiting sleeve two, and both ends of the limiting rod are provided with outward protruding annular protrusions which prevent the limiting sleeve one and the limiting sleeve two from being taken out, the reset spring is sleeved on the outside of the limiting rod and both ends of the reset spring abut against the limiting sleeve one and the limiting sleeve two respectively. Through the setting of the limiting rod, the limiting sleeve one and the limiting sleeve two, support and limiting are provided for the setting of the reset spring.
[0016] Compared with the prior art, the half-plunger brake master cylinder can make the pressure relief core move against the elastic force of the pressure relief spring when the oil pressure in the oil cavity one and the oil cavity two is too high, and make the oil in the oil cavity two be sequentially discharged to the oil cavity three through the side hole one, the recess and the side hole two, thereby reducing the oil pressure in the oil cavity two, reducing the brake resistance applied to the piston in the oil cavity two, and making the brake more relaxed. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a cross-sectional structure schematic view of an embodiment one of the half-plunger brake master cylinder.
[0018] Figure 2 is a cross-sectional structure schematic view of an embodiment two of the half-plunger brake master cylinder.
[0019] In the figure, 1, pump body; 1a, inlet; 1b, outlet; 1c, oil cavity one; 1d, oil cavity two; 1e, oil cavity three; 2, piston; 2a, recess; 2b, side hole one; 2c, side hole two; 2d, protruding part; 2e, stopper; 2f, stop shoulder; 2g, part one; 2h, part two; 3, pressure relief spring; 4, pressure relief core; 4a, sealing part; 5, sealing element; 6, shell; 8, one-way valve; 9, reset spring; 11, limiting sleeve one; 12, limiting sleeve two; 13, limiting rod; 13a, protrusion. DETAILED DESCRIPTION
[0020] The following is a specific embodiment of the present application and further describes the technical scheme of the present application in combination with the drawings, but the present application is not limited to these embodiments. Embodiment one
[0021] As Figure 1As shown, the half-plunger brake master cylinder comprises a pump body 1 having an inlet 1a and an outlet 1b, and a plunger 2 in the shape of a cylinder, the inner hole of the pump body 1 is a stepped hole with the diameter of the bottom smaller than that of the mouth, the inner end of the plunger 2 extends into the pump body 1, the outer end of the plunger 2 extends out of the pump body 1, the smaller-diameter side wall of the pump body 1 is fixed with a ring-shaped cup 1a, and the outer side of the plunger 2 is fixed with a cup 2. The arrangement of the cup 1a and the cup 2 cooperates with the plunger 2 to sequentially divide the inside of the pump body 1 into an oil chamber 1c, an oil chamber 1d and an oil chamber 1e, the oil chamber 1c is communicated with the outlet 1b, and the oil chamber 1e is communicated with the inlet 1a.
[0022] The inner end of the plunger 2 has an axially recessed recess 2a, and the recess 2a is provided with a pressure relief spring 3 and a pressure relief core 4 in the shape of a cylinder, the side wall of the recess 2a is provided with a side hole 1 and a side hole 2c which are communicated with the oil chamber 2d and the recess 2a, respectively, and the side hole 1 is located between the opening end of the recess 2a and the side hole 2c. One end of the pressure relief core 4 is located between the side hole 1 and the opening end of the recess 2a, and the outer side of the end of the pressure relief core 4 is sealed with the side wall of the recess 2a, the other end of the pressure relief core 4 has a protruding ring-shaped sealing part 4a, and the sealing part 4a is abutted with the side wall of the recess 2a and forms a seal, the sealing part 4a can move between the side hole 1 and the side hole 2c under the elastic force of the pressure relief spring 3, and the pressure relief core 4 can overcome the elastic force of the pressure relief spring 3 and move the sealing part 4a to make the side hole 1 and the side hole 2c communicated through the recess 2a under the oil pressure in the oil chamber 1c. In this embodiment, the sealing part 4a is two ring-shaped sealing rings fixed on the outer side of the pressure relief core 4.
[0023] Specifically, the plunger 2 has a protruding annular protrusion 2d on the inner wall of the recess 2a, the inner side of the protrusion 2d has a protruding annular stop 2e, one end of the pressure relief core 4 is inserted into the protrusion 2d under the elastic force of the pressure relief spring 3 and abuts on the end face of the stop 2e, the inner side of the protrusion 2d is a cylindrical surface, the outer side of one end of the pressure relief core 4 is fixed with a ring-shaped sealing part 5, and the outer side of the sealing part 5 is abutted with the inner wall of the protrusion 2d and forms a seal. The plunger 2 also has a protruding annular shoulder 2f on the inner wall of the recess 2a, the positions of the protrusion 2d, the side hole 1, the side hole 2c and the shoulder 2f are sequentially arranged along the axial direction of the plunger 2, one end of the pressure relief spring 3 abuts on the other end of the pressure relief core 4, the other end of the pressure relief spring 3 is inserted into the shoulder 2f and abuts on the bottom of the recess 2a, when the pressure relief core 4 moves against the elastic force of the pressure relief spring 3, the other end of the pressure relief core 4 can abut on the shoulder 2f, and when the pressure relief core 4 abuts on the shoulder 2f, the sealing part 5 still abuts on the inner wall of the protrusion 2d and forms a seal.
[0024] In the embodiment, the piston 2 comprises a first part 2g in the shape of a cylinder and a second part 2h in the shape of a column, the inner end of the second part 2h is recessed and fitted outside the outer end of the first part 2g, the inner hole of the first part 2g and the recessed part of the second part 2h form the above-mentioned recessed hole 2a. The side hole one 2b is radially formed on the side wall of the first part 2g. The oil gap is formed between the outside of the outer end of the first part 2g and the inside of the inner end of the second part 2h, and the sealing between the first part 2g and the second part 2h at the position between the oil gap and the side hole one 2b is realized by the sealing ring. The side hole two 2c comprises the first hole and the second hole formed on the outer end side of the first part 2g and the third hole formed on the inner end side of the second part 2h, the first hole and the second hole are communicated with the recessed hole 2a and the oil gap, and the third hole is communicated with the oil gap and the oil chamber three 1e.
[0025] In addition, the oil chamber one 1c is further provided with a cylindrical shell 6 around the outlet 1b, the axial direction of the shell 6 is consistent with the axial direction of the piston 2, the shell 6 is provided with a one-way valve 8 which enables the oil in the oil chamber one 1c to flow to the outlet 1b in one direction, the one-way valve 8 is composed of a spring and a steel ball, and the reset spring 9 is arranged between the shell 6 and the piston 2.
[0026] When not working, the pressure relief core 4 is located between the side hole one 2b and the opening end of the recessed hole 2a and forms a seal, so that the oil chamber two 1d cannot be communicated with the oil chamber one 1c through the side hole one 2b and the recessed hole 2a, at the same time, under the action of the elastic force of the pressure relief spring 3, the sealing part 4a of the pressure relief core 4 moves to between the side hole one 2b and the side hole two 2c and forms a seal with the side wall of the recessed hole 2a, so that the oil chamber two 1d and the oil chamber three 1e cannot be communicated through the side hole one 2b, the recessed hole 2a and the side hole two 2c. That is, the oil chamber one 1c, the oil chamber two 1d and the oil chamber three 1e remain independent and do not communicate with each other.
[0027] When braking, the outer end of the piston 2 moves into the pump body 1 under the action of the force applied by the pedal, and the oil in the oil chamber one 1c and the oil chamber two 1d is squeezed, so that the oil pressure in the oil chamber one 1c and the oil chamber two 1d rises, the oil in the oil chamber one 1c is sent out through the outlet 1b to provide hydraulic energy for braking, and when the oil pressure in the oil chamber two 1d exceeds the oil pressure in the oil chamber one 1c, the oil in the oil chamber two 1d can be supplemented in one direction through the cup one. When the oil pressure in the oil chamber one 1c and the oil chamber two 1d is too high, the oil pressure in the oil chamber one 1c acts on the pressure relief core 4, so that the pressure relief core 4 moves against the elastic force of the pressure relief spring 3, the side hole one 2b and the side hole two 2c are communicated through the gap between the middle part of the pressure relief core 4 and the side wall of the recessed hole 2a, then the oil in the oil chamber two 1d flows to the oil chamber three 1e through the side hole one 2b, the recessed hole 2a and the side hole two 2c in turn, the oil is discharged, the oil pressure in the oil chamber two 1d is reduced, the braking resistance applied to the piston 2 by the oil chamber two 1d is reduced, and the braking is more relaxed. Embodiment two
[0028] AsFigure 2 As shown, the technical solution of this embodiment is substantially the same as that of the first embodiment, differing in that the inner wall of the first body 2g at the inner end of the second sub-hole is recessed, forming a gap with the outer side of the pressure relief core 4, and the third sub-hole is provided on the side of the second body 2h near the bottom of the recessed hole 2a. Consequently, when the pressure relief core 4 moves under the action of the oil pressure within the first oil chamber 1c, overcoming the elastic force of the pressure relief spring 3, the sealing portion 4a can move between the first and second sub-holes, or toward the second sub-hole. The oil within the second oil chamber 1d then flows sequentially through the first side hole 2b, the gap between the outer side of the pressure relief core 4 and the side wall of the recessed hole 2a, the first sub-hole, the oil-passing gap, the second sub-hole, the recessed hole 2a, and the third sub-hole, toward the third oil chamber 1e.
[0029] In addition, a limiting sleeve 11 and a limiting sleeve 2 12, both of which are conical, and a limiting rod 13, both of which are long rod-shaped, are provided in the oil chamber 1c. The smaller ends of the limiting sleeve 11 and the limiting sleeve 2 12 are arranged facing each other, the larger end of the limiting sleeve 11 abuts on the shell 6, and the larger end of the limiting sleeve 2 12 abuts on the piston 2. The two ends of the limiting rod 13 are respectively inserted into the limiting sleeve 11 and the limiting sleeve 2 12, and both ends of the limiting rod 13 have an outwardly protruding circular ring-shaped convex edge 13a to prevent the limiting sleeve 11 and the limiting sleeve 2 12 from falling out, that is, the smaller ends of the limiting sleeve 11 and the limiting sleeve 2 12 have an inwardly folded convex edge, so that the inner hole diameter of the convex edge is smaller than the outer diameter of the convex edge 13a. The return spring 9 is sleeved on the outside of the limiting rod 13 and the two ends of the return spring 9 are respectively against the limiting sleeve 11 and the limiting sleeve 2 12.
[0030] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.
Claims
1. A semi-piston master cylinder brake pump comprising a pump body (1) having an inlet (1a) and an outlet (1b), and a piston (2) in the shape of a cylinder, the inner end of the piston (2) extending into the pump body (1) and sequentially dividing the pump body (1) into an oil chamber one (1c), an oil chamber two (1d) and an oil chamber three (1e), the oil chamber one (1c) being in communication with the outlet (1b), and the oil chamber three (1e) being in communication with the inlet (1a), characterized in that, The inner end of the piston (2) is provided with a recess (2a), and the recess (2a) is provided with a pressure relief spring (3) and a cylindrical pressure relief core (4). The side wall of the recess (2a) is provided with a side hole one (2b) communicating with the oil chamber two (1d) and the recess (2a), and a side hole two (2c) communicating with the oil chamber three (1e) and the recess (2a). The side hole one (2b) is located between the opening end of the recess (2a) and the side hole two (2c). One end of the pressure relief core (4) is located between the side hole one (2b) and the opening end of the recess (2a), and the outer side of the end of the pressure relief core (4) is sealed with the side wall of the recess (2a). The outer side of the other end of the pressure relief core (4) has a protruding annular sealing part (4a), and the sealing part (4a) is abutted with the side wall of the recess (2a) and forms a seal. The sealing part (4a) can move between the side hole one (2b) and the side hole two (2c) under the elastic force of the pressure relief spring (3). The pressure relief core (4) can overcome the elastic force of the pressure relief spring (3) under the oil pressure in the oil chamber one (1c) and drive the sealing part (4a) to move to make the side hole one (2b) and the side hole two (2c) communicate through the recess (2a).
2. The semi-certer brake master cylinder according to claim 1, characterized by The inner wall of the piston (2) in the recess (2a) has a protruding annular convex part (2d). The inner side of the convex part (2d) has a protruding annular stop edge (2e). One end of the pressure relief core (4) is inserted into the convex part (2d) under the elastic force of the pressure relief spring (3) and abuts against the end face of the stop edge (2e). The inner side of the convex part (2d) is a cylindrical surface. The outer side of one end of the pressure relief core (4) is fixed with a circular annular sealing part (5), and the outer side of the sealing part (5) is abutted with the inner side wall of the convex part (2d) and forms a seal.
3. The semi-certer brake master cylinder according to claim 2, characterized by The inner wall of the piston (2) in the recess (2a) also has a protruding annular stop shoulder (2f). One end of the pressure relief spring (3) abuts against the other end of the pressure relief core (4). The other end of the pressure relief spring (3) is inserted into the stop shoulder (2f) and abuts against the bottom of the recess (2a). When the pressure relief core (4) moves against the elastic force of the pressure relief spring (3), the other end of the pressure relief core (4) can abut against the stop shoulder (2f). When the pressure relief core (4) abuts against the stop shoulder (2f), the above-mentioned sealing part (5) still abuts against the inner side wall of the convex part (2d) and forms a seal.
4. Master cylinder brake pump according to claim 1 or 2 or 3, characterized in that The oil chamber one (1c) is also provided with a cylindrical shell (6) around the outlet (1b). The shell (6) is provided with a one-way valve (8) allowing the oil in the oil chamber one (1c) to flow to the outlet (1b) in one direction. The shell (6) and the piston (2) are provided with a reset spring (9).
5. A master cylinder brake pump according to claim 1 or 2 or 3, characterized in that The piston (2) comprises a first part (2g) in the shape of a cylinder and a second part (2h) in the shape of a column, the inner end of the second part (2h) is recessed and sleeved outside the outer end of the first part (2g), the inner hole of the first part (2g) and the recessed part of the second part (2h) constitute the recess (2a).
6. The semi-certer brake master cylinder according to claim 4, wherein The oil cavity one (1c) is further provided with a limiting sleeve one (11) and a limiting sleeve two (12) both in the shape of a tapered cylinder and a limiting rod (13) in the shape of a long rod, both ends of the limiting rod (13) are respectively penetrated into the limiting sleeve one (11) and the limiting sleeve two (12), and both ends of the limiting rod (13) are provided with outward protruding annular protrusions (13a) for preventing the limiting sleeve one (11) and the limiting sleeve two (12) from falling out, the reset spring (9) is sleeved outside the limiting rod (13) and both ends of the reset spring (9) are respectively abutted against the limiting sleeve one (11) and the limiting sleeve two (12).