CN220220702U - Plunger type booster brake pump - Google Patents

Abstract

The utility model relates to a plunger type booster brake pump, which comprises a shell and a plunger assembly, wherein the plunger assembly is arranged in a cavity in the shell, the plunger assembly comprises a plunger and a plunger core, the plunger core is axially arranged in the plunger, one end of the plunger, which is positioned in the shell, is jointly enclosed by the shell and the plunger core to form a first volume cavity, an oil outlet is formed in the first volume cavity, the periphery of the plunger and the shell jointly enclose a second volume cavity and a third volume cavity, the periphery of the plunger core and the plunger jointly enclose a fourth volume cavity, one end of the plunger core, which is far away from the first volume cavity, is jointly enclosed by the plunger to form a fifth volume cavity, the second volume cavity is communicated with the fourth volume cavity, the third volume cavity is communicated with the fifth volume cavity, and the plunger core can move relative to the plunger to enable the fourth volume cavity to be communicated with the first volume cavity or the fifth volume cavity, and the oil pressure of each volume cavity is changed due to the movement of the plunger core, so that the purpose of shortening the stroke and improving the braking force is achieved.

Description

Plunger type booster brake pump

Technical Field

The utility model relates to the field of booster brake pumps for tractors or other motor vehicles, in particular to a plunger type booster brake pump.

Background

When a tractor or other large-sized motor vehicle is braked, the required braking displacement is larger, so that after the displacement of a brake pump is increased, the braking force of the brake pump is proportionally reduced under the condition of the same pedaling force, and the situation that the vehicle cannot be braked occurs. The current common solution is to externally connect a hydraulic source to a brake pump to assist, which leads to the increase of the cost of a tractor or other large motor vehicle; in addition, under the condition of no power, the oil supply hydraulic pump stops working, and at the moment, the power-assisted braking pump can cause the problem of insufficient braking force due to lower output oil pressure, so that the braking safety of a tractor or other large-sized motor vehicles is influenced.

Because the brake cylinder of the tractor and other large-scale motor vehicles is larger, if an independent plunger pump which is not externally supplied with oil is used as a power pump, the plunger of the plunger pump needs to have larger diameter in order to ensure the response speed of the tractor or other large-scale motor vehicles for braking, but the larger plunger diameter can lead to smaller brake oil pressure under the condition of certain stepping force of a brake pedal, so that the braking force finally provided by the brake is insufficient; if a smaller diameter plunger is used to increase the brake oil pressure, the plunger stroke increases during braking, and the braking response speed is reduced.

Disclosure of Invention

The utility model provides a plunger type booster brake pump, which aims to solve the problem that when the existing independent plunger pump is used as a brake pump on a large-scale motor vehicle such as a tractor, the conflict between the brake oil pressure and the corresponding brake time caused by the fixed size of a plunger cannot be regulated, and the plunger type booster brake pump can move a plunger core in the plunger by utilizing the change of the oil pressure in each cavity during the brake, so that the aim of rapid brake is fulfilled, and the specific technical scheme is as follows:

a plunger type booster brake pump comprises a shell and a plunger assembly, wherein the plunger assembly is arranged in a cavity in the shell, the plunger assembly comprises a plunger and a plunger core, the plunger core is axially arranged in the plunger, one end of the plunger, which is positioned in the shell, is jointly surrounded by the shell and the plunger core to form a first volume cavity, an oil outlet is formed in the first volume cavity, the oil outlet is connected with a vehicle brake cylinder, the periphery of the plunger and the shell jointly surround a second volume cavity and a third volume cavity, the second volume cavity and the third volume cavity are separated by an annular bulge in the middle of the plunger, the second volume cavity is positioned at one side closer to the oil outlet, the periphery of the plunger core and the plunger jointly surround a fourth volume cavity, one end of the plunger core, which is far away from the first volume cavity, is jointly surrounded by the plunger to form a fifth volume cavity, the second volume cavity is communicated with the fourth volume cavity, the third volume cavity is communicated with the fifth volume cavity under the action of a pressure limiting elastic piece, and the fourth volume cavity and the first volume cavity are jointly surrounded by the circumference of the plunger when the plunger core is not braked and braked under the action of a pressure limiting elastic piece, and the fourth volume cavity is enabled to be communicated with the fifth volume cavity because the fourth volume cavity moves towards the fifth volume cavity when the fourth volume cavity is in the direction because of the first volume cavity is relatively large.

Further, both ends of the plug core are in a truncated cone shape, the radius of the outer end surface of the plug core is larger than that of the inner end surface, the second volume cavity is communicated with the fourth volume cavity through the first through hole, the third volume cavity is communicated with the fifth volume cavity through the second through hole, and the plug core between the first through hole and the fifth volume cavity is attached to the plunger.

Further, an oil inlet is formed in the upper portion of the shell, a first channel and a second channel are formed in two sides of the oil inlet, and the first channel is communicated with the oil inlet and the third volume cavity; the second channel enables the oil inlet to be communicated with the second volume cavity when the second channel is not braked, and enables the oil inlet to be communicated with the third volume cavity when the second channel is braked.

Further, the plunger is sealed with the shell through a Gellan ring.

Further, a reset spring for limiting the position of the plunger is arranged in the first volume cavity along the axial direction of the plunger, and a pressure limiting spring for limiting the position of the plunger is arranged in the fifth volume cavity along the axis of the plunger.

Further, a pressure regulating screw plug for regulating the initial pressure of the pressure limiting spring is also arranged in the fifth volume cavity in the plunger, and the pressure regulating screw plug is connected with the plunger through threads.

Further, the second volume cavity and the third volume cavity are connected through a leather cup in a sealing mode, and the small end face of the leather cup faces the third volume cavity.

Further, the plunger assembly further comprises a limit screw used for limiting the movement direction of the plunger, and the limit screw is installed on the shell through threaded connection.

Further, the two plunger assemblies are symmetrically distributed on two sides of the oil inlet, and correspondingly, each volume cavity formed between the shell and the two plunger assemblies is symmetrically distributed, two oil outlets are symmetrically arranged, and the two oil outlets are respectively connected with left and right brake cylinders of the vehicle.

Further, overflow ports are formed in the upper portion of the first volume cavity, locking blocks are arranged in the overflow ports, locking springs are arranged on the upper sides of the locking blocks, locking spring bases are arranged on the other sides of the locking springs, the locking spring bases are fixedly connected with the shell, and the two overflow ports are connected through a third channel.

The utility model has the beneficial effects that:

1. when the plunger is pushed, the gap of the brake cylinder is eliminated, then the plunger is pushed continuously to enable the oil pressure in the first volume cavity to gradually rise to perform low-pressure braking, when the pressure reaches the set force of the pressure regulating screw plug and the pressure limiting spring, the plug core moves to separate the first volume cavity from the fourth volume cavity, the stepping force is increased at the moment, the oil in the fourth volume cavity is extruded continuously, and a very large braking force can be formed by using a small stepping force.

2. The two plunger assemblies are used for independently controlling the two brake cylinders, and when a large-sized vehicle such as a tractor brakes left and right at the same time, the two overflow ports are opened to enable the left brake cylinder and the right brake cylinder to be communicated, so that the left brake cylinder and the right brake cylinder are ensured to be at the same pressure, and the non-biased brake is ensured.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

1. Fig. 1 is a schematic structural view of a plunger type booster brake pump in a first embodiment;

2. fig. 2 is a perspective view of a plunger type booster brake pump in the first embodiment;

3. FIG. 3 is a schematic diagram showing the movement of a plunger type booster brake pump according to the first embodiment;

4. FIG. 4 is a second schematic diagram of the movement of the plunger booster brake pump in the first embodiment;

5. fig. 5 is a perspective view of a plunger type booster brake pump in the second embodiment;

6. fig. 6 is a schematic structural view of a plunger type booster brake pump in the second embodiment;

7. fig. 7 is a front view of a plunger type booster brake pump in the second embodiment;

8. fig. 8 is a cross-sectional view of the A-A plane of fig. 7.

In the figure: 1. a housing; 1.1, an oil outlet; 1.2, an overflow port; 1.3, an oil inlet; 1.4, a first volume chamber; 1.5, a second volume cavity; 1.6, a third volume chamber; 1.7, a first channel; 1.8, a second channel; 2. a plunger assembly; 2.1, a plunger; 2.2, a plug core; 2.3, a pressure limiting spring; 2.4, a return spring; 2.5, pressure regulating screw plugs; 2.6, a fourth volume chamber; 2.7, a fifth volume chamber; 2.8, a first through hole; 2.9, a second through hole; 2.10, limit screws; 3. a locking spring; 4. a locking spring base; 5. a locking block; 6. a leather cup; 7. a Gelai circle; 8. and a third channel.

Detailed Description

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

The utility model provides the following specific embodiments of plunger type booster brake pumps:

embodiment one:

as shown in fig. 1-2, a plunger type booster brake pump comprises a shell 1 and a plunger 2 component, wherein the plunger component 2 is arranged in a cavity in the shell 1, the plunger component 2 comprises a plunger 2.1 and a plunger core 2.2, the plunger core 2.2 is axially arranged in the plunger 2.1, one end of the plunger 2.1 in the shell 1 and the plunger core 2.2 jointly enclose a first volume cavity 1.4, an oil outlet 1.1 is arranged on the first volume cavity 1.4, the oil outlet 1.1 is connected with a vehicle brake cylinder, an annular bulge is arranged in the middle of the plunger 2.1, the circumference periphery of the plunger 2.1 and the shell 1 jointly enclose a second volume cavity 1.5 and a third volume cavity 1.6, the second volume cavity 1.5 is positioned at one side closer to the oil outlet 1.1, the gap between the periphery of the plug core 2.2 and the plunger 2.1 forms a fourth volume cavity 2.6, one end of the plug core 2.2 away from the first volume cavity 1.4 and the plunger 2.1 jointly enclose a fifth volume cavity 2.7, the second volume cavity 1.5 is communicated with the fourth volume cavity 2.6, the third volume cavity 1.6 is communicated with the fifth volume cavity 2.7, the plug core 2.2 is subjected to the action of a pressure limiting elastic piece when the brake is not braked and braked at low pressure so that the fourth volume cavity 2.6 is communicated with the first volume cavity 1.4, and the plug core 2.2 moves towards the fifth volume cavity 2.7 because of high oil pressure in the first volume cavity 1.4 so that the fourth volume cavity 2.6 is communicated with the fifth volume cavity 2.7 when the brake is braked at high pressure.

Further, two ends of the plug core 2.2 are in a truncated cone shape, the radius of the outer end surface of the plug core 2.2 is larger than that of the inner end surface, the second volume cavity 1.5 is communicated with the fourth volume cavity 2.6 through the first through hole 2.8, the third volume cavity 1.6 is communicated with the fifth volume cavity 2.7 through the second through hole 2.9, and the plug core 2.2 between the first through hole 2.8 and the fifth volume cavity 2.7 is attached to the plunger 2.1; an oil inlet 1.3 is formed in the upper part of the shell 1, a first channel 1.7 and a second channel 1.8 are arranged on two sides of the oil inlet 1.3, and the first channel 1.7 is communicated with the oil inlet 1.3 and a third volume cavity 1.6; the second channel 1.8 enables the oil inlet 1.3 to be communicated with the second volume cavity 1.5 when the brake is not applied, and the oil inlet 1.3, the first channel 1.7, the second channel 1.8 and the third volume cavity 1.6 are always communicated in the forward movement process of the plunger when the brake is applied; when the brake is not applied, the first channel 1.7 and the second channel 1.8 enable all the volume cavities to communicate with each other and be in a zero pressure state.

Further, the plunger 2.1 is sealed with the housing 1 by a glaic ring 7; a reset spring 2.4 for limiting the position of the plunger 2.1 is arranged in the first volume cavity 1.4 along the axial direction of the plunger 2.1, and a pressure limiting spring 2.3 for limiting the position of the plunger 2.2 is arranged in the fifth volume cavity 2.7 along the axial direction of the plunger 2.2; a pressure regulating screw plug 2.5 for regulating the initial pressure of the pressure limiting spring 2.3 is also arranged in a fifth volume cavity 2.7 in the plunger 2.1, and the pressure regulating screw plug 2.5 is connected with the plunger 2.1 through threads; the second volume cavity 1.5 and the third volume cavity 1.6 are connected in a sealing way through a leather cup 6, and the small end face of the leather cup 6 faces the third volume cavity 1.6.

As shown in fig. 3-4, during braking, the pedal pushes the plunger 2.1 to move, and in the first stage: the leather cup 6 passes through the second channel 1.8, the first volume cavity 1.4, the second volume cavity 1.5 and the fourth volume cavity 2.6 are sealed and extruded, and the brake cylinder has a certain idle stroke, so that the brake cylinder is rapidly pushed in a low-pressure state at the stage to eliminate the gap of the brake cylinder; and a second stage: after the clearance of the brake cylinder is eliminated, the plunger 2.1 is pushed continuously, the oil pressure in the first volume cavity 1.4, the second volume cavity 1.5 and the fourth volume cavity 2.6 is increased gradually, and the oil enters the brake cylinder from the oil outlet 1.1 to form low-pressure brake; and a third stage: when the oil pressure in the first volume cavity 1.4, the second volume cavity 1.5 and the fourth volume cavity 2.6 reaches the force set by the pressure regulating screw plug 2.5 and the pressure limiting spring 2.3, the plug core 2.2 is pushed to the direction of the fifth volume cavity 2.7, the first volume cavity 1.4 is closed, the second volume cavity 1.5, the third volume cavity 1.6, the fourth volume cavity 2.6 and the fifth volume cavity 2.7 are communicated, the stepping force is continuously increased to push the plunger 2.1 at the moment, and the brake fluid in the first volume cavity 1.4 is continuously extruded to form a high-pressure pushing brake cylinder. Because the plunger 2.1 area is smaller when high pressure is generated, the operator can use smaller pedaling force to generate great braking force, and the pressure is increased along with the increase of the pedaling force.

After braking is finished, the stepping force is gradually released, the pressure of the braking oil cylinder is gradually reduced, the plunger piston 2.1 is reset under the action of the reset spring 2.4, the plunger core 2.2 is reset under the action of the pressure limiting spring 2.3, the sealing ring of the leather cup 6 has unidirectional sealing performance, braking liquid in the first volume cavity 1.4, the second volume cavity 1.5 and the fourth volume cavity 2.6 is sealed when the plunger piston 2.1 advances forwards, and oil in the third volume cavity 1.6 can enter the second volume cavity 1.5 to supplement the oil in the second volume cavity when retreats.

Embodiment two:

as shown in fig. 5-8, the plunger assembly 2 further comprises a limit screw 2.10 for limiting the direction of movement of the plunger 2.1, the limit screw 2.10 being mounted on the housing 1 by means of a threaded connection. The two groups of plunger 2.1 components are symmetrically distributed on two sides of the oil inlet 1.3, correspondingly, two first volume cavities 1.4, two second volume cavities 1.5, two third volume cavities 1.6, two fourth volume cavities 2.6 and two fifth volume cavities 2.7 are symmetrically distributed, two oil outlets 1.1 are symmetrically arranged, and the two oil outlets 1.1 are respectively connected with left and right brake cylinders of a vehicle; two first volume chambeies 1.4 top all are opened and are had overflow mouth 1.2, all install locking piece 5 in every overflow mouth 1.2, in locking piece 5 tip a part deep hole, when plunger 2.1 moved forward, locking piece 5 can be by jack-up make third passageway 8 and first volume chambeies 1.4 intercommunication, locking spring 3 is all installed to every locking piece 5 upside, every locking spring 3 opposite side all is equipped with locking spring base 4, every locking spring base 4 all with casing 1 fixed connection, connect through third passageway 8 between two overflow mouths 1.2.

The two plunger assemblies 2.1 control the left and right brake cylinders of large vehicles such as tractors at the same time, if the two plungers 2.1 are stepped on simultaneously, the left and right brakes are simultaneously braked, at the moment, the two locking blocks 5 are lifted, and the two overflow ports 1.2 are communicated through the third channel 8, so that the left and right brake cylinders are ensured to be at the same pressure, and the unbiased brake is ensured.

The beneficial effects are that: when the plunger piston 2.1 is pushed, the gap of the brake cylinder is eliminated firstly, then the plunger piston 2.1 is pushed continuously to gradually increase the oil pressure in the first volume cavity 1.4 for low-pressure braking, when the pressure reaches the set force of the pressure regulating screw plug 2.5 and the pressure limiting spring 2.3, the plug core 2.2 moves to separate the first volume cavity 1.4 from the fourth volume cavity 2.6, the stepping force is increased at the moment, the oil in the fourth volume cavity 2.6 is continuously extruded, a large braking force can be formed by using a small stepping force, and the braking oil pressure is increased while the braking time is shortened; two brake cylinders are independently controlled through two plunger piston 2.1 assemblies, and when large-scale vehicles such as tractors are braked left and right simultaneously, two overflow ports 1.2 are opened to enable the left brake cylinder and the right brake cylinder to be communicated, so that the left brake cylinder and the right brake cylinder are guaranteed to be at the same pressure, and non-biased brake is guaranteed; in the working process, the leakage of brake oil can be automatically compensated, and the working reliability of the booster brake pump is ensured.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.

Claims (10)

1. The utility model provides a plunger formula booster braking pump, includes casing (1), plunger subassembly (2), and plunger subassembly (2) are installed in the cavity in casing (1), its characterized in that: the plunger assembly (2) comprises a plunger (2.1) and a plunger core (2.2), the plunger core (2.2) is axially arranged in the plunger (2.1), one end of the plunger (2.1) located in the shell (1) and the plunger core (2.2) jointly enclose a first volume cavity (1.4), an oil outlet (1.1) is formed in the first volume cavity (1.4), the periphery of the plunger (2.1) and the shell (1) jointly enclose a second volume cavity (1.5) and a third volume cavity (1.6), the periphery of the plunger core (2.2) and the plunger (2.1) jointly enclose a fourth volume cavity (2.6), one end of the plunger core (2.2) far away from the first volume cavity (1.4) and the plunger (2.1) jointly enclose a fifth volume cavity (2.7), the second volume cavity (1.5) and the fourth volume cavity (2.6) are communicated, and the third volume cavity (1.6) and the fifth volume cavity (2.7) are jointly enclosed, and the fourth volume cavity (2.6) can be movably communicated with the fourth volume cavity (2.1.7).

2. A plunger booster brake pump as defined in claim 1, wherein: both ends of the plug core (2.2) are in a round table shape, the radius of the outer end surface of the plug core (2.2) is larger than that of the inner end surface, the second volume cavity (1.5) is communicated with the fourth volume cavity (2.6) through a first through hole (2.8), the third volume cavity (1.6) is communicated with the fifth volume cavity (2.7) through a second through hole (2.9), and the plug core (2.2) between the first through hole (2.8) and the fifth volume cavity (2.7) is attached to the plunger (2.1).

3. A plunger booster brake pump as defined in claim 1, wherein: the plunger (2.1) and the shell (1) are sealed by a Gelai ring (7).

4. A plunger booster brake pump as defined in claim 1, wherein: a reset spring (2.4) is axially arranged in the first volume cavity (1.4) along the plunger (2.1), and a pressure limiting spring (2.3) for limiting the position of the plunger (2.2) is axially arranged in the fifth volume cavity (2.7) along the plunger (2.2).

5. A plunger booster brake pump as defined in claim 4, wherein: and a pressure regulating screw plug (2.5) for regulating the initial pressure of the pressure limiting spring (2.3) is also arranged in a fifth volume cavity (2.7) in the plunger (2.1), and the pressure regulating screw plug (2.5) is connected with the plunger (2.1) through threads.

6. A plunger booster brake pump as defined in claim 1, wherein: the second volume cavity (1.5) and the third volume cavity (1.6) are connected in a sealing way through a leather cup (6), and the small end face of the leather cup (6) faces the third volume cavity (1.6).

7. A plunger booster brake pump as defined in claim 1, wherein: the plunger assembly (2) further comprises a limit screw (2.10) used for limiting the movement direction of the plunger (2.1), and the limit screw (2.10) is installed on the shell (1) through threaded connection.

8. A plunger booster brake pump as defined in claim 1, wherein: an oil inlet (1.3) is formed in the upper portion of the shell (1), a first channel (1.7) and a second channel (1.8) are arranged on two sides of the oil inlet (1.3), the first channel (1.7) is communicated with the oil inlet (1.3) and the third volume cavity (1.6), and the second channel (1.8) enables the oil inlet (1.3) to be communicated with the third volume cavity (1.6) or the second volume cavity (1.5) along with movement of the plunger (2.1).

9. A plunger booster brake pump as defined in claim 8, wherein: the plunger component (2) is provided with two groups, the two groups are symmetrically distributed on two sides of the oil inlet (1.3), and the two oil outlets (1.1) are symmetrically arranged.

10. A plunger booster brake pump as defined in claim 9, wherein: an overflow port (1.2) is formed in the upper portion of the first volume cavity (1.4), a locking block (5) is arranged in the overflow port (1.2), a locking spring (3) is arranged on the upper side of the locking block (5), a locking spring base (4) is arranged on the other side of the locking spring (3), the locking spring base (4) is fixedly connected with the shell (1), and two overflow ports (1.2) are connected through a third channel (8).