A pneumatic brake valve controlled by hydraulic pressure

Abstract

The utility model discloses a kind of air brake valve controlled by hydraulic pressure, including valve body, air inlet and air outlet;Valve body is equipped with with air inlet through first cavity and with air outlet through second cavity;The first cavity is provided with main piston between the second cavity, which can make the cavity of both realize on-off;Piston group is equipped in the valve body and drives main piston to move;Valve body is equipped with for driving piston group to move several oil inlets;The utility model is through the coordinated action of two-way independent hydraulic control and multistage piston group, first, completely solve the brake failure risk caused by single oil line leakage, realize redundancy security guarantee;Second, hydraulic direct drive is used instead of mechanical transmission, brake response speed is significantly improved and control error caused by wear clearance is eliminated.

Description

Technical Field

[0001] This utility model relates to the field of brake valve technology, and in particular to a pneumatic brake valve controlled by hydraulic pressure. Background Technology

[0002] As important agricultural and engineering power machinery, the reliability, response speed, and safety of the braking system are crucial for tractors. Air braking systems are widely used in tractors due to their high braking torque and relatively simple structure. The air brake valve, as the core control element of this system, is responsible for precisely regulating the flow and pressure of compressed gas to the brake chamber according to the driver's instructions, thereby achieving braking and deactivation of the vehicle.

[0003] Currently, the air brake valves commonly used in tractors are mainly controlled directly through mechanical linkage mechanisms (such as pedals, levers, etc.). However, this purely mechanical control method has significant drawbacks: on the one hand, the mechanical structure has many transmission links and large inertia, resulting in a significant delay in the transmission of braking commands and the movement of the valve core, leading to insufficient braking response speed and affecting braking efficiency; on the other hand, after long-term and frequent use, mechanical parts inevitably experience wear and clearances. These clearances can lead to inaccurate control stroke, increased idle stroke, and even control failure or jamming, severely reducing the accuracy and reliability of braking control. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a dual-path hydraulically controlled pneumatic brake valve. Through a multi-stage piston assembly and independent oil circuit design, redundant control of the hydraulic drive is achieved, significantly improving the safety and reliability of the braking system.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a pneumatic brake valve controlled by hydraulic pressure, comprising a valve body, an air inlet, and an air outlet; The valve body is provided with a first cavity that communicates with the air inlet and a second cavity that communicates with the air outlet; A main piston is provided between the first cavity and the second cavity to enable the connection and disconnection between the two cavities; The valve body is equipped with a piston assembly that drives the main piston. The valve body is provided with several oil inlets for driving the piston assembly.

[0006] In the above scheme, preferably, a connecting hole is provided between the first cavity and the second cavity, the main piston is slidably disposed in the first cavity, and a first sealing ring is provided for sealing the connecting hole.

[0007] In the above scheme, preferably, a first spring is provided between the main piston and the valve body.

[0008] In the above scheme, preferably, the piston assembly includes a first piston that cooperates with the main piston, the first piston is provided with a first push rod, and the main piston is provided with a second sealing ring that abuts against the end face of the first push rod.

[0009] In the above scheme, preferably, a first channel is formed between the first push rod and the connecting hole, and the main piston is provided with a slot that communicates with the first channel after being moved, and the first channel communicates with the second cavity.

[0010] In the above scheme, preferably, the piston assembly includes a second piston that cooperates with the first piston. One end of the second piston is provided with a second push rod for driving the first piston, and the other end forms a first oil injection chamber with the valve body. The valve body is provided with a first oil inlet connected to the first oil injection chamber.

[0011] In the above scheme, preferably, the piston assembly includes a third piston that cooperates with the second piston. One end of the third piston abuts against the second piston, and the other end forms a second oil injection chamber with the valve body. The valve body is provided with a second oil inlet connected to the second oil injection chamber.

[0012] In the above scheme, preferably, a second spring is provided between the first piston and the valve body.

[0013] In the above scheme, preferably, the main piston and the first piston are provided with through holes, and the valve body is provided with an exhaust pipe connected to the through holes.

[0014] In the above scheme, preferably, the first cavity is provided with a limiting member that cooperates with the main piston, the main piston is provided with a sliding rod that slides with the limiting member, and the first spring is provided between the main piston and the limiting member.

[0015] The beneficial effects of this utility model are as follows: First, by using dual-path independent hydraulic control and multi-stage piston assembly in synergy, this utility model completely solves the risk of brake failure caused by single oil circuit leakage, achieving redundant safety assurance; second, by using hydraulic direct drive to replace mechanical transmission, it significantly improves braking response speed and eliminates control errors caused by wear gaps; at the same time, through the linkage design of the main piston, through hole, and exhaust pipe, residual gas is automatically discharged to ensure braking accuracy; in addition, the overall structure is compatible with existing tractor hydraulic systems, with low modification costs and high reliability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0018] Figure 3 This utility model Figure 2Schematic diagram of the AA section structure.

[0019] Figure 4 This utility model Figure 2 A magnified schematic diagram of the structure at point B in the middle.

[0020] Figure 5 This is a cross-sectional view of the main piston driven by this utility model after it has been driven.

[0021] Figure 6 This is a three-dimensional structural diagram of the main piston of this utility model. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: See below Figures 1-6 .

[0023] A hydraulically controlled pneumatic brake valve includes a valve body 1, an air inlet 2, and an air outlet 3. The air inlet 2 is connected to a compressed air source to provide high-pressure gas to the valve body 1. Multiple air outlets 3 are provided, and the compressed gas is discharged through the air inlet 2 and then through the air outlets 3.

[0024] The valve body 1 is provided with a first cavity 101 that communicates with the air inlet 2 and a second cavity 102 that communicates with the air outlet 3. A main piston 4 is provided between the first cavity 101 and the second cavity 102 to enable the opening and closing of the two cavities. Specifically, the main piston 4 is movably disposed in the first cavity 101. After the compressed gas from the air inlet 2 enters the valve body 1, it first enters the first cavity 101.

[0025] like Figure 2 As shown, a partition wall is provided between the first cavity 101 and the second cavity 102. A connecting hole 103 is provided in the middle of the partition wall, and the first cavity 101 and the second cavity 102 are connected through the connecting hole 103. The main piston 4 is slidably disposed in the first cavity 101. A first sealing ring 401 is provided on the end face of the main piston 4 facing the connecting hole 103, which is sealed and connected to the partition wall. When the main piston 4 moves along the partition wall, the sealing ring 401 is sealed and connected to the partition wall. Figure 2 As shown, the first sealing ring 401 slides downwards and comes into contact with the end face of the partition wall at the bottom of the first cavity 101, thereby sealing the connecting hole 103. At this time, the first cavity 101 and the second cavity 102 are disconnected, so that the gas in the first cavity 101 cannot be discharged through the second cavity 102 through the outlet 3.

[0026] The outer edge of the main piston 4 is provided with a plurality of slots 12. A first spring 402 is provided between the upper end face of the main piston 4 and the valve body 1. One end of the first spring 402 abuts against the upper end face of the main piston 4, and the other end abuts against the top wall of the first cavity 101. When the main piston 4 moves along... Figure 2After sliding upward in the indicated direction, the first sealing ring 401 disengages from the bottom wall of the first cavity 101. At this time, the compressed gas in the first cavity 101 enters the connecting hole 103 through the slot 12 and then enters the second cavity 102, and is discharged through the outlet 3, thereby realizing the opening and closing of the valve body 1 through the movement of the main piston 4.

[0027] The main piston 4 is provided with a sliding rod 701, and the valve body 1 is provided with a limiting member 7 that cooperates with the sliding rod 701. The upper end of the sliding rod 701 is slidably disposed in the sliding hole of the limiting member 7, and the outer wall of the sliding rod 701 is provided with a sealing member that cooperates with the sliding hole, thereby preventing gas leakage in the first cavity 101. The first spring 402 is sleeved on the sliding rod 701 and its two ends respectively abut against the main piston 4 and the limiting member 7.

[0028] The valve body 1 is provided with a piston assembly 5 that drives the main piston 4 to move. The piston assembly 5 includes a first piston 501 disposed in the second cavity 102. The first piston 501 includes a first push rod 502 that cooperates with the connecting hole 103 and a plug body. The plug body 502 is slidably connected to the inner wall of the lower end of the second cavity 102 through a sealing element. The first push rod 502 is slidably disposed in the connecting hole 103.

[0029] A second spring 506 is provided between the first piston 501 and the top wall of the second cavity 102. The second spring 506 is sleeved on the first push rod 502, and its two ends respectively abut against the top wall of the second cavity 102 and the upper end face of the first piston 501. Figure 2 and Figure 5 As shown, a first channel 11 for gas passage is formed between the first push rod 502 and the connecting hole 103, and the first channel 11 communicates with the second cavity 102; after the first push rod 502 slides upward and its upper end face passes through the connecting hole 103, it abuts against the main piston 4 and drives the main piston 4 to slide upward, so that the first sealing ring 401 of the main piston 4 disengages from the bottom wall of the first cavity 101. At this time, the compressed gas in the first cavity 101 enters the first channel 11 through the slot 12, and then further enters the second cavity 102. The lower end face of the main piston 4 is provided with a second sealing ring 402 that seals with the upper end face of the first push rod 502.

[0030] The valve body 1 is provided with a plurality of oil inlets 6 for driving the piston assembly 5 to move; the piston assembly 5 includes a second piston 503 that cooperates with the first piston 501. The second piston 503 is located below the first piston 501. The upper end of the second piston 503 is provided with a second push rod 504 for driving the first piston 501. The lower end forms a first oil injection chamber 13 with the valve body 1. The valve body 1 is provided with a first oil inlet 601 connected to the first oil injection chamber 13. After the hydraulic oil passes through the first oil inlet 601, the high-pressure oil is injected into the first oil injection chamber 13, which then drives the second piston 503 to slide upward, so that the first piston 501 slides upward to overcome the pressure of the second spring 506, and further drives the main piston 4 to slide upward, so that it disengages from the connecting hole 103, thereby realizing the communication between the first chamber 101 and the second chamber 102.

[0031] The piston assembly 5 includes a third piston 505 that cooperates with the second piston 503. The third piston 505 is located below the second piston 503, such as... Figure 2 and Figure 5 As shown, one end of the third piston 505 abuts against the second piston 503, and the other end forms a second oil injection chamber 14 between it and the valve body 1. The valve body 1 is provided with a second oil inlet 602 connected to the second oil injection chamber 14. Hydraulic oil injects high-pressure oil into the second oil injection chamber 14 through the second oil inlet 602, which then drives the third piston 505 to slide upward, lifting the second piston 503 and the first piston 501, and further driving the main piston 4 to slide upward, disengaging it from the connecting hole 103, thereby realizing the communication between the first chamber 101 and the second chamber 102. Figure 5 The diagram shown is the state after the jacking up.

[0032] Both the main piston 4 and the first piston 501 are provided with through holes 15. The upper end of the valve body 1 is provided with an exhaust pipe 16 connected to the through holes 15. When the main piston 4 is not driven by the piston assembly 5 (i.e., when the oil inlet 6 is not filled with high-pressure oil), a gap groove 21 is provided between the upper end of the first piston 501 and the main piston 4. At this time, the gas in the second chamber 102 and the pipeline can enter the through holes 15 in the first piston 501 and the main piston 4 through the gap groove 21 and be discharged, and further exhaust is achieved through the exhaust pipe 16.

[0033] Using a hydraulically controlled pneumatic brake valve as described above: 1. Braking start-up procedure (hydraulic drive opens the air circuit) Hydraulic input: High-pressure oil is injected into the first oil filling chamber 13 from the first oil inlet 601 and / or into the second oil filling chamber 14 from the second oil inlet 602; Piston assembly 5 drive: The oil pressure in the first oil injection chamber 13 pushes the second piston 503 upward → the second push rod 504 lifts the first piston 501; the oil pressure in the second oil injection chamber 14 pushes the third piston 505 upward → directly lifts the second piston 503 and the first piston 501; Main piston 4 unlocks: First piston 501 moves upward to overcome the resistance of second spring 506 → First push rod 502 enters the connecting hole 103 and pushes main piston 4; Main piston 4 compresses first spring 402 and moves upward → First sealing ring 401 disengages from the partition wall, and slot 12 is exposed. Air passage connection: Compressed gas enters the first chamber 101 from the air inlet 2 → through the slot 12 → through the connecting hole 103 → through the first channel 11 → through the second chamber 102 → and outputs braking air pressure from the air outlet 3.

[0034] 2. Brake release procedure (hydraulic unloading and reset) Hydraulic release: Pressure is released at the first oil inlet 601 and the second oil inlet 602; Main piston reset: First spring 402 pushes main piston 4 down → first sealing ring 401 re-seals connection hole 103 → air passage cut off; Piston assembly reset: The second spring 506 pushes the first piston 501 down, which in turn drives the second piston 503 and the third piston 505 back to their initial positions; Residual gas discharge: Residual gas in the second chamber 102 and pipeline → through the gap groove 21 → through the through hole 15 between the main piston 4 and the first piston 501 → discharged through the exhaust pipe 16.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pneumatic brake valve controlled by hydraulic pressure, characterized in that: It includes a valve body (1), an air inlet (2) and an air outlet (3); The valve body (1) is provided with a first cavity (101) that communicates with the air inlet (2) and a second cavity (102) that communicates with the air outlet (3). A main piston (4) is provided between the first cavity (101) and the second cavity (102) to enable the connection and disconnection between the two cavities. The valve body (1) is provided with a piston assembly (5) that drives the main piston (4) to move. The valve body (1) is provided with several oil inlets (6) for driving the piston assembly (5) to move.

2. The pneumatic brake valve controlled by hydraulic pressure according to claim 1, characterized in that: A connecting hole (103) is provided between the first cavity (101) and the second cavity (102). The main piston (4) is slidably disposed in the first cavity (101) and is provided with a first sealing ring (401) for sealing the connecting hole (103).

3. A pneumatic brake valve controlled by hydraulic pressure according to claim 2, characterized in that: A first spring (402) is provided between the main piston (4) and the valve body (1).

4. A hydraulically controlled pneumatic brake valve according to claim 2, characterized in that: The piston assembly (5) includes a first piston (501) that cooperates with the main piston (4). The first piston (501) is provided with a first push rod (502), and the main piston (4) is provided with a second sealing ring (403) that abuts against the end face of the first push rod (502).

5. A hydraulically controlled pneumatic brake valve according to claim 4, characterized in that: A first channel (11) is formed between the first push rod (502) and the connecting hole (103). The main piston (4) is provided with a slot (12) that communicates with the first channel (11) after being moved. The first channel (11) is connected to the second cavity (102).

6. A hydraulically controlled pneumatic brake valve according to claim 4, characterized in that: The piston assembly (5) includes a second piston (503) that cooperates with the first piston (501). One end of the second piston (503) is provided with a second push rod (504) for driving the first piston (501), and the other end forms a first oil injection chamber (13) with the valve body (1). The valve body (1) is provided with a first oil inlet (601) connected to the first oil injection chamber (13).

7. A hydraulically controlled pneumatic brake valve according to claim 6, characterized in that: The piston assembly (5) includes a third piston (505) that cooperates with the second piston (503). One end of the third piston (505) abuts against the second piston (503), and the other end forms a second oil injection chamber (14) between it and the valve body (1). The valve body (1) is provided with a second oil inlet (602) connected to the second oil injection chamber (14).

8. A hydraulically controlled pneumatic brake valve according to claim 4, characterized in that: A second spring (506) is provided between the first piston (501) and the valve body (1).

9. A hydraulically controlled pneumatic brake valve according to any one of claims 4-8, characterized in that: The main piston (4) and the first piston (501) are provided with through holes (15), and the valve body (1) is provided with an exhaust pipe (16) connected to the through holes (15).

10. A hydraulically controlled pneumatic brake valve according to claim 3, characterized in that: The first cavity (101) is provided with a limiting member (7) that cooperates with the main piston (4), and the main piston (4) is provided with a sliding rod (701) that slides with the limiting member (7). The first spring (402) is located between the main piston (4) and the limiting member (7).

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