Brake system controlled by electro-hydraulic servo pump

Abstract

The utility model belongs to the field of hydraulic systems, and particularly relates to an electro-hydraulic servo pump control brake system. Comprising a brake control box, an emergency motor pump, a one-way valve, an emergency valve, a filter, a damper, a pressure sensor, a brake actuator, a main motor pump, a pressurizing oil tank, a filling port, a low-pressure safety valve and a high-pressure safety valve. The throttle valve is high in structural integration degree, simple in structure and connector, high in reliability, insensitive to oil pollution, good in maintainability and free of throttling loss.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic systems, and particularly relates to an electro-hydraulic servo pump-controlled brake system. Background Technique

[0002] With the development of the times and the progress of technology, the requirements for the reliability, maintainability, repairability, and modular design of aircraft wheel brake systems are getting higher and higher. Traditional aircraft mainly adopt the form of power hydraulic transmission with centralized oil supply. Its characteristic is that the main hydraulic pump is driven by the engine to output high-pressure oil, and the high-pressure oil drives each actuator to work; power electric transmission, as a new power transmission method for the flight control system, its characteristic is that the aircraft engine drives the generator to directly output electric energy to each action part, and each actuator is an independent unit, directly converting electric energy into mechanical energy, mechanical energy into hydraulic energy, and hydraulic energy to drive the actuator to work.

[0003] The high-pressure medium of the traditional valve-controlled electro-hydraulic servo brake system comes from the aircraft main pump. The main pump is connected to the brake system through pipelines, and components such as solenoid valves and pressure reducing valves need to be connected in series in the middle of the pipelines. The hydraulic interfaces are relatively complex, and there are many pollutants in the main oil circuit of the aircraft, which are particularly likely to cause the pressure servo valve to be blocked and fail. By designing a modular electro-hydraulic servo pump-controlled brake system, the problem of the pressure servo valve being blocked and failing is avoided. The pump-controlled electro-hydraulic servo brake eliminates the connection with the aircraft hydraulic pipeline, and the system has a power source backup, ensuring the reliability and maintainability of the system. Content of the Utility Model

[0004] The purpose of the utility model is to provide an electro-hydraulic servo pump-controlled brake system, which realizes the modularization of the system, simplifies the structure and interfaces, has a small volume and a light weight, improves the anti-pollution ability, and enhances the reliability.

[0005] To achieve the above purpose, the utility model provides the following technical solution: an electro-hydraulic servo pump-controlled brake system, including a brake control box, an emergency motor pump, a one-way valve, an emergency valve, a filter, a damper, a pressure sensor, a brake actuator, a main motor pump, a pressurized oil tank, a filling port, a low-pressure safety valve, a high-pressure safety valve, an integrated valve block, and a high-pressure oil port;

[0006] The power supply and control signals of the main motor pump, the emergency motor pump and the pressure sensor are connected to the brake control box through cables; the B port of the main motor pump is connected to the P port of the emergency valve, and the P port of the emergency valve is respectively connected to the pressure sensor, the brake actuator, the filter, and the high-pressure safety valve. The other end of the filter is connected to the damper and is connected in series with the pressurizing oil tank, and the other end of the high-pressure safety valve is connected to the pressurizing oil tank. The low-pressure safety valve and the filling port are installed on the pressurizing oil tank; the A port of the main motor pump and the B port of the emergency motor pump are directly connected to the pressurizing oil tank; the A port of the emergency motor pump is connected to the check valve and the P port of the emergency valve, and the other end of the check valve is connected to the control port of the emergency valve; the integrated valve block is used as an installation integrated block for components, with installation interfaces designed on the outside and oil circuits designed on the inside; the high-pressure oil port is opened on the integrated valve block;

[0007] The connection is an oil circuit connection.

[0008] Furthermore, the check valve, the emergency valve, the filter, the damper, the high-pressure safety valve, and the filling port all adopt an embedded structure and are embedded in the integrated valve block; the pressure sensor and the low-pressure safety valve are both connected to the integrated valve block by a cartridge type structure.

[0009] Furthermore, the pressurizing oil tank adopts a closed pressurizing oil tank and is arranged with a double oil tank.

[0010] Furthermore, the high-pressure oil port and the brake actuator are connected in a plate type by screws.

[0011] Furthermore, the oil circuit connection is a pipe connection, a plate connection, a cartridge connection, or a combination thereof.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: (1) The present utility model adopts distributed oil supply, eliminating the need for pipeline connection with the on-board oil source, making the system interface simple, enhancing reliability, and reducing the sealing parts; (2) The present utility model adopts a two-way servo motor pump as the control element, significantly enhancing its anti-pollution ability and ensuring the safe and reliable operation of the brake system; (3) The present utility model adopts a redundancy design. Even when the main electric pump fails, the emergency electric pump can still reliably control the brake pressure, further increasing the reliability of the system.

[0013] To more clearly illustrate the functional characteristics and structural parameters of the present utility model, the following further explains with reference to the drawings and specific embodiments. Description of the Drawings

[0014] The accompanying drawings described herein are used to provide a further understanding of the present utility model and form a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0015] Figure 1 is the schematic diagram of the electro-hydraulic servo pump-controlled braking system of the present utility model;

[0016] Figure 2 is the three-dimensional structure diagram of the electro-hydraulic servo pump-controlled braking system of the present utility model;

[0017] Figure 3 is the side view of the structure of the electro-hydraulic servo pump-controlled braking system of the present utility model;

[0018] Figure 4 is the sectional view of the structure of the electro-hydraulic servo pump-controlled braking system of the present utility model.

[0019] The reference numerals in the figure are: 1 - brake control box, 2 - emergency motor pump, 3 - check valve, 4 - emergency valve, 5 - filter, 6 - damper, 7 - pressure sensor, 8 - brake actuator, 9 - main motor pump, 10 - booster oil tank, 11 - filling port, 12 - low-pressure safety valve, 13 - high-pressure safety valve, 14 - integrated valve block, 15 - high-pressure oil port. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments; based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] An electro-hydraulic servo pump-controlled braking system includes a brake control box 1, an emergency motor pump 2, a check valve 3, an emergency valve 4, a filter 5, a damper 6, a pressure sensor 7, a brake actuator 8, a main motor pump 9, a booster oil tank 10, a filling port 11, a low-pressure safety valve 12, a high-pressure safety valve 13, an integrated valve block 14, and a high-pressure oil port 15;

[0022] The power supply and control signals of the main motor pump 9, the emergency motor pump 2, and the pressure sensor 7 are connected to the brake control box 1 through cables; the B port of the main motor pump 9 is connected to the P1 port of the emergency valve 4, and the P port of the emergency valve 4 is respectively connected to the pressure sensor 7, the brake actuator 8, the filter 5, and the high-pressure safety valve 13. The other end of the filter 5 is connected to the damper 6 and is connected in series with the pressurizing oil tank 10. The other end of the high-pressure safety valve 13 is connected to the pressurizing oil tank 10. The low-pressure safety valve 12 and the filling port 11 are installed on the pressurizing oil tank 10; the A port of the main motor pump 9 and the B port of the emergency motor pump 2 are directly connected to the pressurizing oil tank 10; the A port of the emergency motor pump 2 is connected to the check valve 3 and the P2 port of the emergency valve 4, and the other end of the check valve 3 is connected to the control port of the emergency valve 4; the integrated valve block 14 is used as an installation integrated block for components, with installation interfaces designed on the outside and oil circuits designed on the inside; the high-pressure oil port 15 is opened on the integrated valve block 14;

[0023] The connection is an oil circuit connection.

[0024] Furthermore, the check valve 3, the emergency valve 4, the filter 5, the damper 6, the high-pressure safety valve 13, and the filling port 11 all adopt an embedded structure and are embedded in the integrated valve block 14; the pressure sensor 7 and the low-pressure safety valve 12 are both connected to the integrated valve block 14 by a cartridge type structure.

[0025] Furthermore, the pressurizing oil tank 10 adopts a closed pressurizing oil tank and is arranged with a double oil tank. The pressurizing oil tank 10 provides oil supply for the system, and under the pressurizing action of the spring, the motor pump can suck oil smoothly.

[0026] Furthermore, the high-pressure oil port 15 and the brake actuator 8 (the serial number 8 in the schematic diagram is the brake actuator, and the brake actuator is usually connected to the wheel brake pads together, so the label of the brake actuator model is omitted in the embodiments of the present invention) are connected in a plate type by four M5 screws.

[0027] Furthermore, the oil circuit connection is a pipe connection or a plate connection or a cartridge connection or a combination thereof.

[0028] This system has two sets of motor pumps. The motor pumps belong to two-way servo motor pumps. Under normal circumstances, the emergency motor pump 2 does not work, and only the main motor pump 9 works; when the main motor pump 9 fails and cannot work, the emergency motor pump 2 starts to be used for the servo control of the brake system.

[0029] The design of the filling port 11 facilitates oil injection into the system. The low-pressure safety valve 12 can ensure that the fuel tank and the system will not be damaged due to excessive internal pressure. The high-pressure safety valve 13 can prevent other components from being damaged due to overpressure in the system. The setting of the damper 6 ensures that it is not easy to overshoot when adjusting the brake pressure of the system. The filter 5 placed at the front end of the damper 6 can effectively control the entry of contaminant particles into the damper 6 and cause blockage of the damper 6. The emergency valve 4 can switch the oil circuits of the main motor pump 9 and the emergency motor pump 2 when the main motor pump 9 fails. The pressure sensor 7 is set in the main oil circuit of the system, and the pressure sensor 7 feeds back the pressure value to the brake control box 1 for comparison with the pressure value given by the flight control system. The brake control box 1 adjusts the rotation speed and direction of the servo motor pump in real time according to the comparison result. A check valve 3 is designed in the hydraulic control circuit of the emergency valve 4 in the hydraulic system, and the check valve 3 can ensure that in the emergency state, the emergency valve 4 always works in the right-position emergency state.

[0030] When the brake control box of the electro-hydraulic servo pump-controlled brake system receives the brake command from the flight control system, the control box drives the main motor pump 9 to rotate forward. The motor pump 9 sucks oil from the pressurizing fuel tank 10. The high-pressure oil discharged by the main motor pump 9 enters the rodless chamber of the brake actuator 8 and the bypass (the series circuit of the filter 5 and the damper 6) through the left working position of the emergency valve 4. As the rotation speed of the main motor pump 9 increases, the pressure in the rodless chamber of the brake actuator 8 gradually increases. This pressure value is fed back to the brake control box 1 through the pressure sensor 7 until the pressure value is equal to the pressure value given by the flight control system, and the main motor pump 9 stops increasing its rotation speed. When the flight control system issues an instruction to unload the brake pressure, the main motor pump 9 rotates in reverse, sucks oil from the rodless chamber of the brake actuator 8, and discharges the oil into the pressurizing fuel tank 10 until the pressure in the rodless chamber of the brake actuator 8 is quickly unloaded to zero. When the main motor pump 9 fails, the emergency motor pump 2 starts to rotate forward under the instruction of the brake control box 1. The emergency motor pump 2 starts to suck oil from the pressurizing fuel tank 10. The high-pressure medium discharged by it first enters the check valve 3 and pushes the emergency valve 4 to work to the right position and lock. At this time, the high-pressure oil enters the rodless chamber of the brake actuator 8 and the system bypass (the series circuit of the filter 5 and the damper 6) through the emergency valve 4. Its working principle is the same as when controlling the main motor pump 9 to output brake pressure, so it will not be elaborated here.

[0031] The described system bypass (the series circuit of the filter 5 and the damper 6) is used to increase the damping of the system when the brake pressure rises, prevent system pressure overshoot and instability, and serve as a leakage channel to quickly release pressure when the brake pressure is released.

[0032] When the system works continuously for a long time and the oil expands due to heat, when the active volume of the pressurizing oil tank 10 is insufficient, the low-pressure safety valve 12 opens to discharge the multi-media in the pressurizing oil tank 10 to prevent damage to other system components.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electro-hydraulic servo pump-controlled brake system, characterized in that: It includes a brake control box (1), an emergency motor pump (2), a one-way valve (3), an emergency valve (4), a filter (5), a damper (6), a pressure sensor (7), a brake actuator (8), a main motor pump (9), a booster oil tank (10), a filling port (11), a low-pressure safety valve (12), a high-pressure safety valve (13), an integrated valve block (14), and a high-pressure oil port (15); The power supply and control signals of the main motor pump (9), the emergency motor pump (2) and the pressure sensor (7) are connected to the brake control box (1) through cables; the B port of the main motor pump (9) is connected to the P1 port of the emergency valve (4), and the P port of the emergency valve (4) is respectively connected to the pressure sensor (7), the brake actuator (8), the filter (5), and the high-pressure safety valve (13); the other end of the filter (5) is connected to the damper (6) and connected in series to the boost tank (10); the other end of the high-pressure safety valve (13) is connected to the boost tank (10). The boost oil tank (10) is provided with the low-pressure safety valve (12) and the filling port (11); the A port of the main motor pump (9) and the B port of the emergency motor pump (2) are directly connected to the boost oil tank (10); the A port of the emergency motor pump (2) is connected to the P2 port of the one-way valve (3) and the emergency valve (4), and the other end of the one-way valve (3) is connected to the control port of the emergency valve (4); the integrated valve block (14) is used as an integrated block for installing components, and is provided with an installation interface on the outside and an oil circuit on the inside; the opening of the high-pressure oil port (15) is provided on the integrated valve block (14); The connection is an oil circuit connection.

2. The electro-hydraulic servo pump-controlled brake system according to claim 1, characterized in that: The one-way valve (3), the emergency valve (4), the filter (5), the damper (6), the high-pressure safety valve (13), and the filling port (11) all adopt an embedded structure and are embedded in the integrated valve block (14); the pressure sensor (7) and the low-pressure safety valve (12) are both connected to the integrated valve block (14) by a plug-in structure.

3. The electro-hydraulic servo pump-controlled brake system according to claim 1, characterized in that: The boost oil tank (10) is a closed boost oil tank and adopts a double oil tank arrangement.

4. The electro-hydraulic servo pump-controlled brake system according to claim 1, characterized in that: The high-pressure oil port (15) and the brake actuator (8) are connected in a plate-type manner via screws.

5. The electro-hydraulic servo pump-controlled brake system according to claim 1, characterized in that: The oil circuit connection is a pipe connection, a plate connection, a plug-in connection or a combination thereof.

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