Integrated electro-hydrostatic actuating device

Abstract

The invention relates to an integrated electro-hydrostatic actuating device which comprises a motor, a two-way plunger pump, an oil tank, a first balance valve, a second balance valve, an integrated valve block, an actuating cylinder and a pressurizing mechanism. The two-way plunger pump is provided with a first pump connecting port, a second pump connecting port and a pump connecting oil return port; a plunger of a piston rod in the actuating cylinder divides the oil cylinder into a first hydraulic cavity and a second hydraulic cavity; a second interface of the first balance valve is connected with the first hydraulic cavity; an oil return port of the pump is connected with a C port of the pump; a D port of the pump is connected with an access port of the pressurizing mechanism; and an E port of the pump is connected with a second port of the pump and a first interface of the second balance valve through pipelines, and a second interface of the second balance valve is connected with the second hydraulic cavity through pipelines. Therefore, the problems that an existing conventional valve control actuator is large in oil source power size, wide in pipeline distribution, large in occupied space and the like are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of actuators, and in particular to an integrated electric hydrostatic actuating device. Background Art

[0002] Aircraft actuation systems are crucial in the aviation field, and actuation technology is a key enabler for aircraft control and piloting. Traditional aircraft actuation systems generally utilize hydraulic transmission, which requires a large central hydraulic system and hydraulic piping throughout the aircraft to transmit power. Mechanical actuation is achieved locally on the aircraft by regulating hydraulic oil pressure through valves to activate the actuating components. However, with technological advancements and increasing demands for actuation performance, several issues inherent in traditional hydraulic transmission systems have gradually emerged:

[0003] (1) To transmit power to various parts of the aircraft, the actuation system requires a central hydraulic system including a main oil pump, an emergency oil pump, and an accumulator, as well as pipelines throughout the fuselage to transmit oil pressure. These components occupy a large volume and mass on the aircraft, affecting the aircraft's performance potential.

[0004] (2) The hydraulic pipelines are spread throughout the fuselage, which increases the complexity of the fuselage design. Since most hydraulic components work in closed housings and pipelines, it is not convenient to directly observe and inspect them, making it difficult to detect faults in time and poorly maintainable.

[0005] (3) There are also many factors that cause failures in the hydraulic system itself. For example, when air is sucked into the oil pump and mixed with the hydraulic oil to form bubbles, the so-called "cavitation phenomenon" is very likely to occur, causing strong impact and vibration. After the metal parts in the hydraulic system are subjected to the oxidation effect of oxygen in the bubbles and hydraulic shock for a long time, the surface will be corroded, usually called "cavitation", which seriously affects their working reliability and service life.

[0006] These issues have limited the further application of traditional hydraulic systems in airborne actuation, leading to their replacement with aircraft actuation systems that utilize power-by-wire (PBW) technology. As the name suggests, PBW involves the transmission of power energy in the form of electricity via cables. A key advancement of PBW actuation systems in aircraft is the elimination of a central hydraulic source and extensive hydraulic piping, significantly improving reliability, maintainability, and transmission efficiency, and significantly enhancing overall aircraft performance.

[0007] The electro-hydrostatic actuator (EHA) is the most representative power-by-wire actuation system. Unlike traditional hydraulic systems, EHA controls the speed of the motor by controlling the electrical signal, directly driving the pump, thereby controlling the pressure and flow of the pump output, and accurately controlling the actuation process of changing the displacement of the actuating component. As an airborne actuation system, EHA has the advantages of higher actuation stability and fast actuation adjustment response of traditional hydraulic systems, and effectively reduces the volume and mass, realizes modularization and distribution, and improves the reliability and maintainability of the actuation system. In addition, electro-hydrostatic actuators can not only be used in the aerospace field, but also have broad prospects for promotion to the civilian field as the technology develops and matures.

[0008] In the existing technology, conventional valve-controlled actuators are generally large in size and mass; the steering gear system has many components, which are dispersed, have a high failure rate, and are difficult to maintain; high-pressure oil is transmitted over long distances, resulting in large energy losses and low system efficiency; the oil source power volume is large, the pipelines are widely distributed, and they take up a large space. Summary of the Invention

[0009] In order to solve the problems of existing conventional valve-controlled actuators such as large oil source power volume, wide pipeline distribution, and large space occupation, the present invention provides an integrated electric hydrostatic actuator.

[0010] In a first aspect, the present invention provides an integrated electric hydrostatic actuating device, comprising: a motor, a bidirectional plunger pump, a fuel tank, a first balancing valve, a second balancing valve, an integrated valve block, an actuator, and a booster mechanism, wherein the bidirectional plunger pump has a pump connection port 1, a pump connection port 2, and a pump return port, the integrated valve block has ports A, B, C, D, and E, the actuator comprises a cylinder and a piston rod inside, the piston rod's plug divides the cylinder into a first hydraulic chamber and a second hydraulic chamber that are not connected to each other, the pump connection port 1 is connected to the port B via a pipeline, the port A is connected to a first interface of the first balancing valve via a pipeline, the second interface of the first balancing valve is connected to the first hydraulic chamber via a pipeline, the pump return port is connected to the port C via a pipeline, the port D is connected to an inlet of the booster mechanism via a pipeline, the port E is connected to the pump connection port 2 and the first interface of the second balancing valve respectively via pipelines, and the second interface of the second balancing valve is connected to the second hydraulic chamber via a pipeline;

[0011] The motor drives the bidirectional plunger pump to suck oil from the oil tank and output high-pressure oil. The output high-pressure oil flows to the first hydraulic chamber through the pump connection port 1, pushing the piston rod to move. The oil in the second hydraulic chamber is pressed back to the E port through the second balancing valve and flows into the oil tank through the pump connection port 2; or, the output high-pressure oil flows to the second hydraulic chamber through the pump connection port 2, pushing the piston rod to move. The oil in the first hydraulic chamber is pressed back to the A port through the first balancing valve and flows into the oil tank through the pump connection port 1;

[0012] Wherein, the integrated valve block adopts an integrated structure;

[0013] The integrated valve block comprises a first one-way valve, a second one-way valve, and a third one-way valve. The port A is in communication with the port B. The input end of the first one-way valve is in communication with a port of the integrated valve block. The output end of the first one-way valve is in communication with the port B. The input end of the second one-way valve is in communication with the port C. The output end of the second one-way valve is in communication with the port of the integrated valve block. The input end of the third one-way valve is in communication with the port of the integrated valve block. The output end of the third one-way valve is in communication with the port E. The port of the integrated valve block is in communication with the port D.

[0014] The boosting mechanism includes a boosting oil tank, a low-pressure safety valve and a first filling valve. The output end of the first filling valve is respectively connected to the input end of the low-pressure safety valve and the inlet of the boosting mechanism. The output end of the low-pressure safety valve is connected to the input end of the boosting oil tank, and the output end of the boosting oil tank is connected to the inlet of the boosting mechanism.

[0015] In some embodiments, the integrated valve block further has a first high-pressure safety valve and a second high-pressure safety valve, the input end of the first high-pressure safety valve is connected to the A port, the output end of the first high-pressure safety valve is connected to the E port, the input end of the second high-pressure safety valve is connected to the E port, and the output end of the second high-pressure safety valve is connected to the A port.

[0016] In some embodiments, the integrated valve block further has a fourth one-way valve, a fifth one-way valve and an oil filter, the input end of the fourth one-way valve is connected to the B port, the output end of the fourth one-way valve is connected to the A port and the input end of the fifth one-way valve respectively, the output end of the fifth one-way valve is connected to the input end of the oil filter, and the output end of the oil filter is connected to the output end of the first one-way valve.

[0017] In some embodiments, the boosting mechanism further comprises a first pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are both disposed at an access port of the boosting mechanism.

[0018] In some embodiments, the first balancing valve includes a sixth one-way valve and a third high-pressure safety valve, the input end of the sixth one-way valve is connected to the first interface of the first balancing valve, the output end of the sixth one-way valve is connected to the second interface of the first balancing valve, the input end of the third high-pressure safety valve is connected to the second interface of the first balancing valve, and the output end of the third high-pressure safety valve is connected to the first interface of the first balancing valve.

[0019] In some embodiments, the second balancing valve includes a seventh one-way valve and a fourth high-pressure safety valve, the input end of the seventh one-way valve is connected to the first interface of the second balancing valve, the output end of the seventh one-way valve is connected to the second interface of the second balancing valve, the input end of the fourth high-pressure safety valve is connected to the second interface of the second balancing valve, and the output end of the fourth high-pressure safety valve is connected to the first interface of the second balancing valve.

[0020] In some embodiments, a second filling valve and a third filling valve are further included, wherein the output end of the second filling valve is connected to the A port, and the output end of the third filling valve is connected to the C port.

[0021] In some embodiments, a feedback potentiometer, a second pressure sensor and a third pressure sensor are also included. The feedback potentiometer is embedded in the piston rod, the second pressure sensor is arranged at the second interface of the first balancing valve, and the third pressure sensor is arranged at the second interface of the first balancing valve.

[0022] To solve the problems of conventional valve-controlled actuators, such as large oil source power volume, wide pipeline distribution, and large space occupation, the present invention has the following advantages:

[0023] Through the technical solution of the present invention, the integrated valve block is used to adopt an integrated structure, which can reduce the system mass and space. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the hydraulic principle of the integrated electric hydrostatic actuator is shown;

[0025] Figure 2 Shown Figure 1 Schematic diagram of hydraulic principle after integration of the integrated valve block shown in;

[0026] Figure 3 Shown Figure 1 The diagram shows the hydraulic principle of the integrated electric hydrostatic actuator excluding the integrated valve block.

[0027] Figure markings: 1-motor; 2-bidirectional plunger pump; 3-integrated valve block; 31-first one-way valve; 32-second one-way valve; 33-third one-way valve; 34-fourth one-way valve; 35-fifth one-way valve; 36-oil filter; 37-first high-pressure safety valve; 38-second high-pressure safety valve; 39-port of integrated valve block; 41-boosting oil tank; 42-low-pressure safety valve; 43-first pressure sensor; 44-temperature sensor; 45-first filling valve; 46-access port of boosting mechanism; 51-second pressure sensor; 52-third pressure sensor; 61-second filling valve; 62-third filling valve; 7-first balancing valve; 71-sixth one-way valve; 72-third high-pressure safety valve; 8-second balancing valve; 81-seventh one-way valve; 82-fourth high-pressure safety valve; 9-bypass valve; 10-actuator; 11-feedback potentiometer. DETAILED DESCRIPTION

[0028] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0029] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0030] See also Figures 1 to 3As shown, this embodiment discloses an integrated electric hydrostatic actuating device, including: a motor 1, a bidirectional plunger pump 2, an oil tank, a first balancing valve 7, a second balancing valve 8, an integrated valve block 3, an actuator 10 and a booster mechanism, wherein the bidirectional plunger pump 2 has a pump 1 port, a pump 2 port and a pump return oil port, the integrated valve block 3 has an A port, a B port, a C port, a D port and an E port, the actuator 10 has an oil cylinder and a piston rod inside, the piston rod of the piston rod separates the oil cylinder into a first hydraulic chamber and a second hydraulic chamber that are not connected to each other, The pump connection port 1 is connected to the port B via a pipeline, the port A is connected to the first interface of the first balancing valve 7 via a pipeline, the second interface of the first balancing valve 7 is connected to the first hydraulic chamber via a pipeline, the pump connection oil return port is connected to the port C via a pipeline, the port D is connected to the inlet 46 of the boosting mechanism via a pipeline, the port E is connected to the pump connection port 2 and the first interface of the second balancing valve 8 via pipelines, and the second interface of the second balancing valve 8 is connected to the second hydraulic chamber via a pipeline;

[0031] The motor 1 drives the bidirectional plunger pump 2 to suck oil from the oil tank and output high-pressure oil. The output high-pressure oil flows to the first hydraulic chamber through the pump connection port 1, pushing the piston rod to move. The oil in the second hydraulic chamber is pressed back to the E port through the second balancing valve 8 and flows into the oil tank through the pump connection port 2; or, the output high-pressure oil flows to the second hydraulic chamber through the pump connection port 2, pushing the piston rod to move. The oil in the first hydraulic chamber is pressed back to the A port through the first balancing valve 7 and flows into the oil tank through the pump connection port 1;

[0032] The integrated valve block 3 is configured as an integrated structure.

[0033] In this embodiment, the present invention provides an integrated electric hydrostatic actuating device, including a motor 1 pump combination, an actuating cylinder 10 assembly, and an integrated valve block 3. The three main components are connected by bolts to form the actuating device.

[0034] Specifically, the motor-pump assembly includes a motor 1, a pump housing, and a bidirectional fixed-displacement pump. The motor-pump assembly is connected to the actuator 10 assembly via bolts. The forward and reverse rotation of the motor 1 allows the oil in the system to pass through the pump 1 and pump 2 ports, and any oil leaking from the system flows back to the tank via the pump return port. The bolted connections ensure that the pump 1, pump 2, and pump return ports of the motor-pump assembly are constantly connected to the pump 1, pump 2, and pump return ports of the actuator 10 assembly, ensuring that the bidirectional fixed-displacement pump can continuously supply high-pressure oil to the system.

[0035] Specifically, three pipes are provided in the shell of the actuator cylinder 10 assembly, one end of the three pipes is respectively connected to the pump 1 port, the pump 2 port and the pump return oil port, and the other ends of the three pipes are respectively connected to the B port, the E port and the C port on the integrated valve block 3, so that the motor 1 drives the bidirectional plunger pump 2 to suck oil from the oil tank and output high-pressure oil. The output high-pressure oil flows into the integrated valve block 3 through the pump 1 port or the pump 2 port, and is supplied to the first hydraulic chamber or the second hydraulic chamber in the actuator cylinder 10 through the A port or the E port of the integrated valve block 3, so that it pushes the piston rod to move.

[0036] Specifically, such as Figure 3 As shown, two oil circuits are formed in the integrated electric hydrostatic actuator disclosed in the present application, wherein the first oil circuit is the forward rotation of the motor 1, so that the motor 1 drives the bidirectional plunger pump 2 to suck oil from the oil tank and output high-pressure oil. The output high-pressure oil is supplied to the B port through the pump 1 port, flows out from the A port, then flows into the first interface of the first balancing valve 7, and flows out from the second interface of the first balancing valve 7 until it reaches the first hydraulic chamber, so that the pressure in the first hydraulic chamber increases, thereby pushing the piston rod toward the side where the second hydraulic chamber is located. At this time, since the piston rod moves toward the side where the second hydraulic chamber is located, the space in the second hydraulic chamber will be reduced. Then, when the piston rod moves toward the side where the second hydraulic chamber is located, it will push the oil in the second hydraulic chamber toward the side where the second interface of the second balancing valve 8 is located, thereby increasing the pressure in this area, thereby forcing the high-pressure safety valve in the second balancing valve 8 to open, thereby causing the oil to flow through the first interface of the second balancing valve 8 to the E port, and then flow into the oil tank through the pump 2 port. Similarly, the second oil circuit is the reverse rotation of motor 1, so that motor 1 drives bidirectional plunger pump 2 to suck oil from the oil tank and output high-pressure oil. The output high-pressure oil is supplied to port E through pump connection port 2, and flows from port E into the first interface of the second balancing valve 8, and flows out from the second interface of the second balancing valve 8 until it reaches the second hydraulic chamber, causing the pressure in the second hydraulic chamber to increase, thereby pushing the piston rod toward the side where the first hydraulic chamber is located. At this time, as the piston rod moves toward the side where the first hydraulic chamber is located, the space in the first hydraulic chamber will decrease. Then, when the piston rod moves toward the side where the first hydraulic chamber is located, it will push the oil in the first hydraulic chamber toward the side where the second interface of the first balancing valve 7 is located, thereby increasing the pressure in this area, forcing the high-pressure safety valve in the first balancing valve 7 to open, and then causing the oil to flow through the first interface of the first balancing valve 7 to port A, and then through port B of the integrated valve block 3 to pump connection port 2 and into the oil tank.

[0037] Specifically, the bidirectional metering pump is connected to the motor 1 via bolts, ensuring that the motor 1 can provide continuous power to the bidirectional metering pump and that the bidirectional metering pump can achieve forward and reverse rotation. The bidirectional metering pump provides high-pressure oil to the system through oil suction and discharge. In this application, the pump housing is connected to the motor 1 via bolts, and the bidirectional metering pump is embedded in the pump housing, ensuring that the high-pressure oil and low-pressure oil of the bidirectional metering pump can enter the actuator cylinder 10 assembly.

[0038] In some embodiments, the integrated valve block 3 has a first high-pressure safety valve 37, a second high-pressure safety valve 38, a first one-way valve 31, a second one-way valve 32 and a third one-way valve 33. The input end of the first high-pressure safety valve 37 is connected to the A port, and the A port is connected to the B port. The output end of the first high-pressure safety valve 37 is connected to the E port. The input end of the second high-pressure safety valve 38 is connected to the E port, and the output end of the second high-pressure safety valve 38 is connected to the A port. The input end of the first one-way valve 31 is connected to the port 39 of the integrated valve block, the output end of the first one-way valve 31 is connected to the B port, the input end of the second one-way valve 32 is connected to the C port, the output end of the second one-way valve 32 is connected to the port 39 of the integrated valve block, the input end of the third one-way valve 33 is connected to the port 39 of the integrated valve block, the output end of the third one-way valve 33 is connected to the E port, and the port 39 of the integrated valve block is connected to the D port.

[0039] Furthermore, the integrated valve block 3 also has a fourth one-way valve 34, a fifth one-way valve 35 and an oil filter 36. The input end of the fourth one-way valve 34 is connected to the B port, and the output end of the fourth one-way valve 34 is connected to the A port and the input end of the fifth one-way valve 35 respectively. The output end of the fifth one-way valve 35 is connected to the input end of the oil filter 36, and the output end of the oil filter 36 is connected to the output end of the first one-way valve 31.

[0040] In this embodiment, the integrated valve block 3 includes two high-pressure safety valves (i.e., a first high-pressure safety valve 37 and a second high-pressure safety valve 38), five one-way valves (i.e., a first one-way valve 31, a second one-way valve 32, a third one-way valve 33, a fourth one-way valve 34 and a fifth one-way valve 35), an oil filter 36 and an integrated valve housing. Among them, an integrated valve housing is integrated in the interior of the integrated valve block 3 in a plug-in manner, and the two high-pressure safety valves, the five one-way valves and the oil filter 36 are all integrated in the integrated valve housing, so that the surface of the integrated valve housing is formed with ports A, B, C, D and E that are connected to the oil circuit inside the integrated valve block 3. In this application, the integrated valve block 3 is connected to the actuator cylinder 10 assembly through the integrated valve housing by bolts, so as to achieve high-pressure protection of system components, oil filtration, and one-way circulation. In the prior art, due to the large number and variety of hydraulic components in the hydraulic circuit and the relatively complex oil circuit, it is difficult to achieve a completely integrated structural design. Therefore, by Figure 1 By analyzing the hydraulic circuit in the middle, the distribution circuit, filtration circuit and safety protection circuit composed of five one-way valves, two high-pressure safety valves and oil filter 36 can be extracted to form the hydraulic circuit of the integrated valve block 3. Figure 2 . Figure 2 The A to E ports are the oil circuit interfaces between the integrated valve block 3 and the actuator 10 assembly, and can be connected to the corresponding interfaces on the housing of the actuator 10 assembly in the form of end-face butt sealing.

[0041] Furthermore, the first high-pressure safety valve 37 and the second high-pressure safety valve 38 are embedded in the integrated valve housing and communicate with the entire system oil circuit, thereby protecting the entire system components.

[0042] Furthermore, the first one-way valve 31 , the second one-way valve 32 , the third one-way valve 33 , the fourth one-way valve 34 and the fifth one-way valve 35 are installed inside the integrated valve housing to control the one-way flow of the hydraulic oil and prevent the hydraulic oil from flowing back.

[0043] Furthermore, the oil filter 36 is embedded in the integrated valve housing to ensure that large particles of impurities cannot enter the interior of the precision components, thereby preventing the precision components from being damaged by large particles.

[0044] In some embodiments, the boosting mechanism has a boosting oil tank 41, a low-pressure safety valve 42 and a first filling valve 45, the output end of the first filling valve 45 is respectively connected to the input end of the low-pressure safety valve 42 and the inlet 46 of the boosting mechanism, the output end of the low-pressure safety valve 42 is connected to the input end of the boosting oil tank 41, and the output end of the boosting oil tank 41 is connected to the inlet 46 of the boosting mechanism.

[0045] Furthermore, the boost mechanism further comprises a first pressure sensor 43 and a temperature sensor 44 , both of which are disposed at an inlet 46 of the boost mechanism.

[0046] Furthermore, the first balancing valve 7 includes a sixth one-way valve 71 and a third high-pressure safety valve 72. The input end of the sixth one-way valve 71 is connected to the first interface of the first balancing valve 7, and the output end of the sixth one-way valve 71 is connected to the second interface of the first balancing valve 7. The input end of the third high-pressure safety valve 72 is connected to the second interface of the first balancing valve 7, and the output end of the third high-pressure safety valve 72 is connected to the first interface of the first balancing valve 7.

[0047] Furthermore, the second balancing valve 8 includes a seventh one-way valve 81 and a fourth high-pressure safety valve 82. The input end of the seventh one-way valve 81 is connected to the first interface of the second balancing valve 8, and the output end of the seventh one-way valve 81 is connected to the second interface of the second balancing valve 8. The input end of the fourth high-pressure safety valve 82 is connected to the second interface of the second balancing valve 8, and the output end of the fourth high-pressure safety valve 82 is connected to the first interface of the second balancing valve 8.

[0048] Furthermore, a second filling valve 61 and a third filling valve 62 are included. The output end of the second filling valve 61 is connected to the A port, and the output end of the third filling valve 62 is connected to the C port.

[0049] Furthermore, it also includes: a feedback potentiometer 11, a second pressure sensor 51 and a third pressure sensor 52, the feedback potentiometer 11 is embedded in the piston rod, the second pressure sensor 51 is arranged at the second interface of the first balancing valve 7, and the third pressure sensor 52 is arranged at the second interface of the first balancing valve 7.

[0050] In this embodiment, the actuator 10 assembly includes a housing, within which are mounted: the actuator 10, a bypass valve 9, a filling valve, a pressure sensor, a balancing valve, a boost tank 41, a feedback potentiometer 11, and multiple pressure sensors. The actuator 10 internally houses a cylinder and a piston rod, with the piston rod's plunger dividing the cylinder into a first hydraulic chamber and a second hydraulic chamber that are not interconnected. In this application, the cylinder and boost tank 41 within the actuator 10 utilize an integrated design and share a common housing. The balancing valves (i.e., the first balancing valve 7 and the second balancing valve 8) and the pressure sensor are mounted on the housing using a plug-in design. The feedback potentiometer 11 is coaxially embedded within the piston rod, effectively shortening the length of the actuator 10. The signal cables for the pressure sensor and feedback potentiometer 11 are routed through a wire hole in the housing and fed into a wiring box within the housing, where they are centrally connected to an electrical outlet mounted on the housing, eliminating the need for externally extending cables.

[0051] Furthermore, the oil cylinder is embedded in the housing, and the extension and retraction of the piston rod is achieved by changing the oil in the two chambers of the oil cylinder (ie, the first hydraulic chamber and the second hydraulic chamber).

[0052] Furthermore, the bypass valve 9 is installed in an embedded form inside the shell. The bypass valve 9 is mainly used to connect the two chambers of the oil cylinder. When the integrated electric hydrostatic actuator fails or the actuator is filled with oil, the bypass valve 9 is used to switch to the two-chamber connection state.

[0053] Furthermore, the embedded feedback potentiometer 11 is installed inside the piston rod, and the extended and retracted positions of the piston rod can be detected by the embedded feedback potentiometer 11.

[0054] Furthermore, two balancing valves can be fixed to the housing by inserting and installing, mainly used to lock the two chambers of the oil cylinder and help maintain the position of the piston rod;

[0055] Furthermore, the function of the boost oil tank 41 is to establish the return oil pressure of the closed system to avoid the return oil pressure being too low after the pressure is built up in the load chamber of the integrated electric hydrostatic actuator, which may cause the plunger pump to be sucked empty.

[0056] Furthermore, the filling valve is mounted on the housing by two screws to realize the oil filling and oil draining functions of the integrated electric hydrostatic actuator.

[0057] Furthermore, a pressure sensor is embedded in the housing to collect the pressure of the internal oil circuit of the integrated electric hydrostatic actuator in real time.

[0058] In this embodiment, the working principle of the integrated electric hydrostatic actuator is as follows: the controller receives the control instructions from the host computer, undergoes three-loop closed-loop control of the position loop, speed loop, and current loop, outputs a PWM signal through pulse width modulation, drives the power module to control the power switch of the inverter to produce different combination states, outputs a controllable sinusoidal voltage to drive the motor 1 to rotate, drives the bidirectional hydraulic variable pump to rotate, generates flow and pressure in the output chamber of the pump, transmits it to the actuator cylinder 10 through the integrated hydraulic oil circuit, and pushes the piston of the actuator cylinder 10 to produce linear motion. Among them, the controller has a power module, a communication module, and a control module, namely a drive module. The controller controls the forward and reverse rotation of the motor 1 through the mutual cooperation between several internal modules. In this application, the controller is a prior art and is not described in detail in this application.

[0059] Specifically, by controlling the forward and reverse rotation of the motor 1, the bidirectional quantitative pump is driven to rotate, and flow and pressure are generated in the output chamber of the bidirectional quantitative pump, which are transmitted to the oil cylinder through the integrated hydraulic oil circuit, pushing the piston rod to produce linear motion. During the whole process, the integrated valve block 3 adopts an integrated structural design, extracting the distribution circuit, filtration circuit and safety protection circuit composed of five one-way valves, two high-pressure safety valves and oil filter 36 to form an integrated hydraulic circuit, which can be used separately in the hydraulic circuit.

[0060] Specifically, the main function of motor 1 is to realize the conversion of electrical energy into mechanical energy and drive the bidirectional quantitative pump to rotate forward and reverse; the bidirectional quantitative pump is the core component of the actuator, and its main function is to generate output flow according to the forward and reverse rotation of motor 1 to drive the piston rod to move; the function of the booster oil tank 41 is to establish the return oil pressure of the closed system to avoid the bidirectional quantitative pump from sucking air due to the low return oil pressure caused by the pressure established in the load chamber of the actuator; a plurality of small-flow one-way valves (i.e., the first one-way valve 31, the second one-way valve 32 and the third one-way valve 33) and a large-flow one-way valve (i.e., the fourth one-way valve 34 and the fifth one-way valve 35) are combined to form a pump low-pressure chamber oil replenishment circuit, a hydraulic oil filtration circuit and an oil flow configuration; two high-pressure safety valves Provide an overload protection circuit; two balancing valves are used to lock the two chambers of the cylinder to help maintain the position of the cylinder; the bypass valve 9 is mainly used to connect the two chambers of the cylinder. When the integrated electric hydrostatic actuator fails or the actuator is filled with oil, the bypass valve 9 is used to switch to the two-chamber connection state; the oil filter 36 and the one-way valve form a filter circuit to filter out pollutants in the actuator hydraulic system; the piston rod is the output component of the mechanism, and the hydraulic oil enables the piston rod to output the required thrust and linear velocity; the pressure sensor is mainly used to measure the working pressure of the load chamber and the low-pressure chamber in real time, and can also provide dynamic pressure feedback according to the system control requirements; the embedded feedback potentiometer 11 provides position feedback for the system; the filling valve is used to pump oil and fill oil in the hydraulic system.

[0061] Specifically, such as Figure 3As shown, the pump low-pressure chamber oil replenishment circuit is composed of the pump return oil port of the bidirectional plunger pump, the second one-way valve 32, the low-pressure safety valve 42 and the boost oil tank 41. Specifically, the input end of the second one-way valve 32 is connected to the C port, the output end of the second one-way valve 32 is connected to the port 39 of the integrated valve block, the port 39 of the integrated valve block is connected to the D port, the D port is connected to the inlet 46 of the boosting mechanism through a pipeline, the input end of the low-pressure safety valve 42 is connected to the inlet 46 of the boosting mechanism, and the output end of the low-pressure safety valve 42 is connected to the input end of the boost oil tank 41. In the present application, the above-mentioned arrangement is combined to form a pump low-pressure chamber oil replenishing circuit, so that the hydraulic oil in the oil tank can be replenished into the boosting oil tank 41 through the low-pressure safety valve 42 in the oil replenishing circuit, so as to alleviate the problem that the boosting oil tank 41 replenishes a part of the hydraulic oil into the first oil circuit or the second oil circuit through the first one-way valve 31 or the third one-way valve 33, causing the hydraulic oil in the replenished oil circuit to flow into the oil tank when the integrated electric hydrostatic actuating device is actuated in the opposite direction, resulting in an increase in the hydraulic oil reserve in the oil tank. Accordingly, the hydraulic oil reserve in the boosting oil tank is increased. The pressure in the oil replenishing circuit of the low-pressure chamber of the pump is reduced, resulting in excessive pressure in the oil replenishing circuit of the low-pressure chamber of the pump. When the pressure exceeds the specified value of the low-pressure safety valve 42, the low-pressure safety valve will automatically open to discharge the over-pressure portion, so that part of the hydraulic oil in the oil tank can be replenished into the boosting tank 41 through the second one-way valve 32 and the low-pressure safety valve 42 to establish the return oil pressure of the closed system of the integrated electric hydrostatic actuating device, so that the integrated electric hydrostatic actuating device does not need to set up additional valves and connecting oil circuits to replenish the boosting tank 41, thereby reducing the manufacturing cost.

[0062] Therefore, in the solution disclosed in the present application, the hydraulic oil in the boost tank 41 can be replenished only through the second one-way valve 32, the low-pressure safety valve 42, and the oil circuit connection with the boost tank 41, thereby reducing the number of valves used, simplifying the oil circuit connection, and facilitating the disassembly or assembly of the entire integrated electric hydrostatic actuator.

[0063] In summary, through the above structural setting, the integrated valve block adopts an integrated structural setting, which can reduce the system mass and space;

[0064] Through the above structural setting, most components can be plug-in assembled, so that the system has fewer components.

[0065] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0066] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An integrated electric hydrostatic actuating device, characterized in that: include: A motor, a bidirectional piston pump, a fuel tank, a first balancing valve, a second balancing valve, an integrated valve block, an actuator and a booster mechanism, wherein the bidirectional piston pump has a pump connection port 1, a pump connection port 2 and a pump return port, the integrated valve block has ports A, B, C, D and E, an oil cylinder and a piston rod are provided inside the actuator, the piston rod's plug separates the oil cylinder into a first hydraulic chamber and a second hydraulic chamber that are not connected to each other, the pump connection port 1 is connected to the port B through a pipeline, the A port is connected to the first interface of the first balancing valve through a pipeline, the second interface of the first balancing valve is connected to the first hydraulic chamber through a pipeline, the pump return port is connected to the C port through a pipeline, the D port is connected to the inlet of the booster mechanism through a pipeline, the E port is connected to the pump connection port 2 and the first interface of the second balancing valve through pipelines respectively, and the second interface of the second balancing valve is connected to the second hydraulic chamber through a pipeline; The motor drives the bidirectional plunger pump to suck oil from the oil tank and output high-pressure oil. The output high-pressure oil flows to the first hydraulic chamber through the pump connection port 1, pushing the piston rod to move. The oil in the second hydraulic chamber is pressed back to the E port through the second balancing valve and flows into the oil tank through the pump connection port 2; or, the output high-pressure oil flows to the second hydraulic chamber through the pump connection port 2, pushing the piston rod to move. The oil in the first hydraulic chamber is pressed back to the A port through the first balancing valve and flows into the oil tank through the pump connection port 1; Wherein, the integrated valve block adopts an integrated structure; The integrated valve block comprises a first one-way valve, a second one-way valve, and a third one-way valve. The port A is in communication with the port B. The input end of the first one-way valve is in communication with a port of the integrated valve block. The output end of the first one-way valve is in communication with the port B. The input end of the second one-way valve is in communication with the port C. The output end of the second one-way valve is in communication with the port of the integrated valve block. The input end of the third one-way valve is in communication with the port of the integrated valve block. The output end of the third one-way valve is in communication with the port E. The port of the integrated valve block is in communication with the port D. The boosting mechanism includes a boosting oil tank, a low-pressure safety valve and a first filling valve. The output end of the first filling valve is respectively connected to the input end of the low-pressure safety valve and the inlet of the boosting mechanism. The output end of the low-pressure safety valve is connected to the input end of the boosting oil tank, and the output end of the boosting oil tank is connected to the inlet of the boosting mechanism.

2. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: The integrated valve block also has a first high-pressure safety valve and a second high-pressure safety valve, the input end of the first high-pressure safety valve is connected to the A port, the output end of the first high-pressure safety valve is connected to the E port, the input end of the second high-pressure safety valve is connected to the E port, and the output end of the second high-pressure safety valve is connected to the A port.

3. The integrated electric hydrostatic actuating device according to claim 2, characterized in that: The integrated valve block also has a fourth one-way valve, a fifth one-way valve and an oil filter. The input end of the fourth one-way valve is connected to the B port, the output end of the fourth one-way valve is connected to the A port and the input end of the fifth one-way valve respectively, the output end of the fifth one-way valve is connected to the input end of the oil filter, and the output end of the oil filter is connected to the output end of the first one-way valve.

4. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: The boosting mechanism further comprises a first pressure sensor and a temperature sensor, both of which are arranged at the access port of the boosting mechanism.

5. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: The first balancing valve includes a sixth one-way valve and a third high-pressure safety valve. The input end of the sixth one-way valve is connected to the first interface of the first balancing valve, the output end of the sixth one-way valve is connected to the second interface of the first balancing valve, the input end of the third high-pressure safety valve is connected to the second interface of the first balancing valve, and the output end of the third high-pressure safety valve is connected to the first interface of the first balancing valve.

6. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: The second balancing valve includes a seventh one-way valve and a fourth high-pressure safety valve. The input end of the seventh one-way valve is connected to the first interface of the second balancing valve, the output end of the seventh one-way valve is connected to the second interface of the second balancing valve, the input end of the fourth high-pressure safety valve is connected to the second interface of the second balancing valve, and the output end of the fourth high-pressure safety valve is connected to the first interface of the second balancing valve.

7. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: It also includes a second filling valve and a third filling valve, wherein the output end of the second filling valve is connected to the A port, and the output end of the third filling valve is connected to the C port.

8. The integrated electric hydrostatic actuating device according to claim 1, characterized in that: It also includes a feedback potentiometer, a second pressure sensor and a third pressure sensor. The feedback potentiometer is embedded in the piston rod, the second pressure sensor is arranged at the second interface of the first balancing valve, and the third pressure sensor is arranged at the second interface of the first balancing valve.

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