Brake pump for mobile mechanical brake system

Abstract

The utility model discloses a brake pump used on a mobile mechanical brake system, belongs to the technical field of mobile machinery, and solves the problems that an existing brake pump is strenuous in brake operation and poor in brake effect. The brake pump comprises a pump body, a boosting assembly, a connecting assembly, a brake assembly and a booster cylinder body, and is characterized in that the boosting assembly used for boosting and pushing the brake assembly is arranged at the front end of the pump body, one end of the boosting assembly is connected with a pedal, a boosting cavity is formed between the boosting assembly and the pump body, the connecting assembly is arranged in the pump body, and the booster cylinder body is arranged in the boosting cavity. The pressurizing cylinder body is arranged at the rear end of the pump body, the braking assembly is arranged between the pump body and the pressurizing cylinder body, and the left end and the right end of the connecting assembly are connected with the boosting assembly and the braking assembly respectively. According to the brake pump used on the mobile mechanical brake system, a pressurization mode is adopted, so that the brake pump has the advantages that the brake pedal is labor-saving to operate, the brake displacement is large, and the brake pressure is high.

Description

Technical Field

[0001] The utility model relates to the technical field of mobile machinery, and more particularly to a brake pump used in a brake system of a mobile machinery. Background Art

[0002] Today's mobile machinery is equipped with a braking system, which includes a brake pump. The driver controls the brake pump through the brake pedal. The brake pump brakes to produce the oil required for braking. The oil is transmitted to the brake through the pipeline, and then the machine is braked. There is usually a certain gap between the static plate and the friction plate inside the brake. When braking, the brake piston moves forward, and this gap will be eliminated. The static plate and the friction plate will contact, thereby braking. The gap generated by the movement of the brake piston during braking will be filled by the oil generated by the brake pump. This requires the displacement of the brake pump to be large enough, and the braking pressure during the filling process is not required to be too high. Only when the static plate and the friction plate are in contact is a higher pressure required to achieve the desired braking effect.

[0003] In existing technology, brake pumps operate with a single piston, and only one pressure chamber is active during braking. To achieve the desired displacement, the brake pump often requires a larger piston. An oversized piston makes braking more laborious and the resulting brake pressure insufficient. To achieve higher braking pressure, the piston must be smaller, but a smaller piston sometimes fails to meet the required brake displacement, making it difficult to achieve the desired effect of less braking effort, greater brake displacement, and higher brake pressure. Utility Model Content

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. The purpose of the present invention is to provide a brake pump for a mobile mechanical braking system. By adopting a pressurization method, the brake pump has the advantages of labor-saving brake pedal operation, large brake displacement, and high brake pressure. It has a wide range of applications and strong practicality.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a brake pump for a mobile mechanical braking system, comprising a pump body, a power-assisting component, a connecting component, a brake component, and a booster cylinder. The front end of the pump body is provided with a power-assisting component for assisting in pushing the brake component. One end of the power-assisting component is connected to the foot pedal. A power-assisting chamber is provided between the power-assisting component and the pump body. The connecting component is arranged in the pump body, the booster cylinder is arranged at the rear end of the pump body, the brake component is arranged between the pump body and the booster cylinder. The left and right ends of the connecting component are respectively connected to the power-assisting component and the brake component. A low-pressure chamber and a booster chamber are respectively provided between the brake component and the pump body and the booster cylinder.

[0006] Furthermore, the pump body is provided with a power-assisting oil inlet hole, a power-assisting oil return hole, a brake oil inlet hole, and a brake oil replenishing hole. The power-assisting oil return hole is connected to the power-assisting chamber, the brake piston is arranged between the brake oil inlet hole and the brake oil replenishing hole, and the brake oil replenishing hole is connected to the low-pressure chamber.

[0007] Furthermore, the power-boosting assembly is provided with a power-boosting piston, a first sealing ring and a second sealing ring are provided on the power-boosting piston, a power-boosting piston oil inlet and a power-boosting piston oil return port are provided on the power-boosting piston, a movable plunger and a plunger return spring are provided in the power-boosting piston, a third sealing ring and a fourth sealing ring are provided on the plunger, the distance between the third sealing ring and the fourth sealing ring is equal to the distance between the power-boosting piston oil inlet and the power-boosting piston oil return port, and a power-boosting oil channel communicating with the power-boosting chamber is provided in the plunger.

[0008] Furthermore, the connecting assembly includes a spacer sleeve and a push rod, the push rod is movably plugged into the spacer sleeve, and both ends of the push rod are respectively connected to the power-assisting piston and the brake assembly.

[0009] Furthermore, the brake assembly is provided with a brake piston, a booster piston, and a return spring. The return spring is arranged between the brake piston and the booster cylinder. The brake piston is arranged between the brake oil inlet and the brake oil replenishment port.

[0010] Furthermore, the diameter of the boosting piston is smaller than the diameter of the brake piston.

[0011] Furthermore, a pressure relief valve core is provided in the boosting piston, a first oil passage communicating with the low-pressure chamber is provided in the pressure relief valve core, and a first one-way valve and a second one-way valve are provided at both ends of the first oil passage respectively.

[0012] Furthermore, the first one-way valve and the second one-way valve are both composed of a steel ball, a one-way valve spring, a retaining ring, and a washer.

[0013] Furthermore, the power assist assembly further includes an end cover, and the plunger connects the power assist assembly to the pump body via the end cover.

[0014] Furthermore, a positioning screw is provided on the pump body, and the positioning screw passes through the pump body and is plugged into the connecting assembly.

[0015] Beneficial effects

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] By providing a brake pump for a mobile mechanical braking system, a boosting chamber, a low-pressure chamber and a boosting chamber are provided inside the brake pump. The boosting chamber is assisted by introducing external pressure oil. In the process of the brake piston moving to eliminate the gap, the low-pressure chamber and the boosting chamber work together to achieve the purpose of quickly filling the gap. When the static plate and the friction plate come into contact with each other, the pressure increases. The increased pressure exceeds the pressure of the brake pump pressure relief valve. The pressure relief valve opens to relieve the pressure of the low-pressure chamber, so that the force generated by the braking operation is fully applied to the boosting piston of the boosting chamber, thereby obtaining a higher braking pressure, and ultimately achieving the purpose of labor-saving braking operation, large brake displacement and high brake pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the power assist component of the present utility model;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the connection component of the present invention;

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of the brake assembly of the present invention.

[0022] Among them: 1- pump body, 2- power assist assembly, 3- connection assembly, 4- positioning screw, 5- brake assembly, 8- boost cylinder, 9- pressure relief valve, 10- first check valve, 11- second check valve, 2.1- plunger, 2.2- power assist oil channel, 2.3- end cover, 2.5- first sealing ring, 2.6- third sealing ring, 2.7- plunger return spring, 2.8- second sealing ring, 2.9- fourth sealing ring, 2.10- power assist piston , 3.1- push rod, 3.2- spacer, 3.3- fifth sealing ring, 5.1- first oil channel, 5.2- return spring, 5.3- pressure relief valve core, 5.4- pressure relief valve spring, 5.5- boost piston, 5.6- brake piston, A- power-assisting chamber, B- low-pressure chamber, C- boost chamber, a- power-assisting oil inlet, b- power-assisting oil return port, c- brake oil inlet, d- brake oil replenishment port, e- power-assisting piston oil inlet, f- power-assisting piston oil return port. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0024] See Figure 1-4As shown, a brake pump for a mobile mechanical brake system of the present invention comprises a pump body 1, a power-assisting assembly 2, a connecting assembly 3, a brake assembly 5 and a boosting cylinder 8. A power-assisting assembly 2 for assisting in pushing the brake assembly 5 is provided at the front end of the pump body 1. One end of the power-assisting assembly 2 is connected to the foot pedal. A power-assisting chamber A is provided between the power-assisting assembly 2 and the pump body 1. The connecting assembly 3 is arranged in the pump body 1. The boosting cylinder 8 is arranged at the rear end of the pump body 1. The brake assembly 5 is arranged between the pump body 1 and the boosting cylinder 8. The left and right ends of the connecting assembly 3 are respectively connected to the power-assisting assembly 2 and the brake assembly 5. A low-pressure chamber B and a boosting chamber C are respectively provided between the brake assembly 5 and the pump body 1 and the boosting cylinder 8. A power-assisting chamber A, a low-pressure chamber B and a boosting chamber C are provided inside the brake pump. The power-assisting chamber A is assisted by introducing external pressure oil. The power-assisting assembly 2 is pushed by the oil pressure of the power-assisting chamber A. The power-assisting assembly 2 applies force to the brake assembly 5. When the brake During the process of piston movement to eliminate the gap, the oil pressure in the low-pressure chamber B flows into the boosting chamber C through the first one-way valve 10. The low-pressure chamber B works together with the boosting chamber C to quickly fill the gap, thereby achieving the effect of saving effort in braking operation and large braking displacement, thereby obtaining a larger braking pressure and making the braking effect better. A pressure relief valve spring 5.4 is provided between the pressure relief valve core 5.3 and the boosting piston 5.5. A pressure relief valve 9 composed of the pressure relief valve core 5.3 and the pressure relief valve spring 5.4 is provided. When the pressure relief valve 9 is working, it relieves the pressure in the low-pressure chamber B. When the static plate contacts the friction plate, the pressure increases, and the increased pressure exceeds the pressure of the pressure relief valve 9 of the brake pump. The pressure relief valve 9 opens, and the pressure in the low-pressure chamber B is relieved, so that the force generated by the braking operation is all applied to the boosting piston 5.5 of the boosting chamber C, thereby obtaining a higher braking pressure, and ultimately achieving the purpose of saving effort in braking operation, large braking displacement and high braking pressure.

[0025] Specifically, the pump body 1 is provided with a power-assisted oil inlet hole a, a power-assisted oil return hole b, a brake oil inlet hole c, and a brake oil replenishment hole d. The power-assisted oil return hole b is connected to the power-assisted chamber A. The brake piston 5.6 is arranged between the brake oil inlet hole c and the brake oil replenishment hole d. The brake oil replenishment hole d is connected to the low-pressure chamber B.

[0026] Preferably, the power-assisting assembly 2 is provided with a power-assisting piston 2.10, on which a first sealing ring 2.5 and a second sealing ring 2.8 are provided, and a power-assisting piston oil inlet e and a power-assisting piston oil return port f are provided on the power-assisting piston 2.10, and a movable plunger 2.1 and a plunger return spring 2.7 are provided in the power-assisting piston 2.1, and a third sealing ring 2.6 and a fourth sealing ring 2.9 are provided on the plunger 2.1, and the distance between the third sealing ring 2.6 and the fourth sealing ring 2.9 is equal to the distance between the power-assisting piston oil inlet e and the power-assisting piston oil return port f, and a power-assisting oil channel 2.2 communicating with the power-assisting chamber A is provided in the plunger 2.1, and the power-assisting assembly 2 also includes an end cover 2.3, and the plunger 2.1 connects the power-assisting assembly 2 to the pump body 1 through the end cover 2.3 so that the plunger 2.1 can slide left and right, and the power-assisting piston 2.10 is hollow, and the plunger The lower part of the plunger 2.1 is sleeved in the booster piston 2.10. The third sealing ring 2.6 and the fourth sealing ring 2.9 are provided on the plunger 2.1. The plunger 2.1 can slide left and right in the booster piston 2.10 through the third sealing ring 2.6 and the fourth sealing ring 2.9. A plunger return spring 2.7 is provided at the lower part of the plunger 2.1, which is connected to the pump body 1 through the first sealing ring 2.5 and the second sealing ring 2.8, and can slide left and right at the same time. The booster piston 2.10 is also provided with a booster piston oil inlet e and a booster piston oil return port f. When the plunger 2.1 is not pressed down, the booster piston oil inlet e is sealed, and the booster piston oil return port f is connected to the booster chamber A and the booster oil return port b through the oil hole inside the plunger 2.1. When the plunger 2.1 is pressed down, the booster oil return port f is sealed, and the booster oil inlet a is communicated with the booster chamber A through the booster piston oil inlet e.

[0027] Furthermore, the connecting assembly 3 includes a spacer 3.2 and a push rod 3.1. The push rod 3.1 is movably inserted into the spacer 3.2. The two ends of the push rod 3.1 are respectively connected to the booster piston 2.10 and the brake assembly 5. A fifth sealing ring 3.3 is provided inside the spacer 3.2, so that the push rod 3.1 can slide left and right.

[0028] Furthermore, the brake assembly 5 is provided with a brake piston 5.6, a booster piston 5.5, and a return spring 5.2. The return spring 5.2 is arranged between the brake piston 5.6 and the booster cylinder 8. The brake piston 5.6 is arranged between the brake oil inlet c and the brake oil replenishment port d. The brake piston 5.6 is hollow and the booster piston 5.5 is sheathed inside. The other end of the booster piston 5.5 is placed in the booster cylinder 8. The booster cylinder 8 is connected to the pump body 1 by a fastening screw. The diameter of the booster piston 5.5 is smaller than the diameter of the brake piston 5.6, so that the booster piston 5.5 can slide left and right.

[0029] Furthermore, a pressure relief valve core 5.3 is provided in the boosting piston 5.5, and a first oil channel 5.1 connected to the low-pressure chamber B is provided in the pressure relief valve core 5.3. A first one-way valve 10 and a second one-way valve 11 are respectively provided at both ends of the first oil channel 5.1. The first one-way valve 10 allows the brake oil inlet c and the low-pressure chamber B to be unidirectionally communicated, and the low-pressure chamber B can be replenished with oil through the second one-way valve 11. The first one-way valve 10 allows the low-pressure chamber B and the boosting chamber C to be unidirectionally communicated, and the boosting chamber C can be replenished with oil through the first one-way valve 10.

[0030] Furthermore, the first one-way valve 10 and the second one-way valve 11 are both composed of a steel ball, a one-way valve spring, a retaining ring, and a washer.

[0031] Furthermore, a positioning screw 4 is provided on the pump body 1 , which passes through the pump body 1 and is plugged into the connecting assembly 3 , and the spacer 3 . 2 of the connecting assembly 3 is limited by the positioning screw 4 .

[0032] In the present embodiment, a brake pump for a mobile mechanical brake system is used. When braking begins, plunger 2.1 moves forward, connecting the booster piston oil inlet e to the booster chamber A. The booster piston oil return port f is sealed, and booster oil enters the booster chamber A through the booster oil inlet a. The pressure in the booster chamber A increases, causing booster piston 2.10 and plunger 2.1 to move forward together, initiating boosting. Booster piston 2.10 pushes push rod 3.1, which pushes brake assembly 5 forward. At this time, the pressures in both low-pressure chamber B and booster chamber C increase simultaneously. Low-pressure chamber B replenishes booster chamber C through first one-way valve 10. When the pressure in booster chamber B reaches the pressure of pressure relief valve 9, pressure relief valve 9 opens, releasing the pressure in low-pressure chamber B. While plunger 2.1 continues to move forward, the force from push rod 3.1 fully acts on booster piston 5.5, causing the pressure in booster chamber C to continue to rise, completing braking.

[0033] When the brake is released, the piston 2.10, the push rod 3.1, and the brake assembly 5 are reset under the action of the return spring 5.2. The piston 2.1 is reset under the action of the plunger return spring 2.7. The oil inlet e of the booster piston is sealed, the oil return port f of the booster piston is opened, the booster chamber A is connected to the booster oil return port b, and the boosting stops. The oil is replenished to the low-pressure chamber B through the second one-way valve 11 and the brake oil replenishment port d. The oil is replenished to the boost chamber C through the first one-way valve 10, and the reset is completed. The brake pump of the present utility model is used in a mobile mechanical brake system. It adopts a boosting method, so that the brake pump has the advantages of labor-saving brake pedal operation, large brake displacement, and high brake pressure. It has a wide range of applications and strong practicality.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These modifications and improvements will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A brake pump for a mobile mechanical brake system, comprising a pump body (1), a power assist assembly (2), a connecting assembly (3), a brake assembly (5), and a booster cylinder (8), characterized in that: The front end of the pump body (1) is provided with a power assist assembly (2) for assisting in pushing the brake assembly (5). One end of the power assist assembly (2) is connected to the foot pedal. A power assist chamber (A) is provided between the power assist assembly (2) and the pump body (1). The connecting assembly (3) is provided in the pump body (1). The boosting cylinder (8) is provided at the rear end of the pump body (1). The brake assembly (5) is arranged between the pump body (1) and the boosting cylinder (8). The left and right ends of the connecting assembly (3) are respectively connected to the power assist assembly (2) and the brake assembly (5). A low-pressure chamber (B) and a boosting chamber (C) are respectively provided between the brake assembly (5) and the pump body (1) and the boosting cylinder (8).

2. A brake pump for a mobile mechanical brake system according to claim 1, characterized in that: The pump body (1) is provided with a power-assisted oil inlet hole (a), a power-assisted oil return hole (b), a brake oil inlet hole (c), and a brake oil replenishment hole (d); the power-assisted oil return hole (b) is connected to the power-assisted chamber (A); the brake piston (5.6) is arranged between the brake oil inlet hole (c) and the brake oil replenishment hole (d); and the brake oil replenishment hole (d) is connected to the low-pressure chamber (B).

3. The brake pump for a mobile mechanical brake system according to claim 1, characterized in that: The booster assembly (2) is provided with a booster piston (2.10), a first sealing ring (2.5) and a second sealing ring (2.8) are provided on the booster piston (2.10), a booster piston oil inlet (e) and a booster piston oil return port (f) are provided on the booster piston (2.10), a movable plunger (2.1) and a plunger return spring (2.7) are provided in the booster piston (2.10), a third sealing ring (2.6) and a fourth sealing ring (2.9) are provided on the plunger (2.1), the distance between the third sealing ring (2.6) and the fourth sealing ring (2.9) being equal to the distance between the booster piston oil inlet (e) and the booster piston oil return port (f), and a booster oil passage (2.2) communicating with a booster chamber (A) is provided in the plunger (2.1).

4. A brake pump for a mobile mechanical brake system according to claim 3, characterized in that: The connecting assembly (3) comprises a spacer sleeve (3.2) and a push rod (3.1). The push rod (3.1) is movably plugged into the spacer sleeve (3.2). Both ends of the push rod (3.1) are respectively connected to the booster piston (2.10) and the brake assembly (5).

5. The brake pump for a mobile mechanical brake system according to claim 2, characterized in that: The brake assembly (5) is provided with a brake piston (5.6), a booster piston (5.5), and a return spring (5.2); the return spring (5.2) is arranged between the brake piston (5.6) and the booster cylinder (8); and the brake piston (5.6) is arranged between the brake oil inlet (c) and the brake oil replenishment port (d).

6. The brake pump for a mobile mechanical brake system according to claim 5, characterized in that: The diameter of the boosting piston (5.5) is smaller than the diameter of the brake piston (5.6).

7. The brake pump for a mobile mechanical brake system according to claim 5, characterized in that: A pressure relief valve core (5.3) is provided in the boosting piston (5.5), a first oil passage (5.1) communicating with the low-pressure chamber (B) is provided in the pressure relief valve core (5.3), and a first one-way valve (10) and a second one-way valve (11) are provided at both ends of the first oil passage (5.1).

8. The brake pump for a mobile mechanical brake system according to claim 7, characterized in that: The first one-way valve (10) and the second one-way valve (11) are both composed of a steel ball, a one-way valve spring, a retaining ring, and a washer.

9. The brake pump for a mobile mechanical brake system according to claim 3, characterized in that: The power assist assembly (2) further comprises an end cover (2.3), and the plunger (2.1) connects the power assist assembly (2) to the pump body (1) via the end cover (2.3).

10. The brake pump for a mobile mechanical brake system according to claim 1, characterized in that: The pump body (1) is provided with a positioning screw (4), and the positioning screw (4) passes through the pump body (1) and is plugged into the connecting assembly (3).

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