A high-integration electro-hydraulic actuator assembly formed by SLM

Abstract

The application discloses an SLM formed high-integration electro-hydraulic actuator assembly, which is integrally formed. The actuator shell is connected with a motor through a motor interface. The actuator shell is connected with a one-way valve, a hydraulic one-way valve, a micro pressure sensor and an overflow valve through a one-way valve interface, a hydraulic one-way valve interface, a micro pressure sensor interface and a first / second overflow valve interface respectively. The actuator shell is connected with a gear pump through a gear pump interface. Meanwhile, a gear pump oil port is directly connected with a first oil supplement flow channel, a first main flow channel and a third main flow channel. The motor is connected with the gear pump through a motor shaft hole. A displacement sensor magnetic ring is arranged in the actuator. The remaining parts are connected with each other through flow channels and are integrally designed in the actuator. The SLM forming technology is applied to the forming manufacturing of the electro-hydraulic actuator, so that the high integration of multiple elements of the electro-hydraulic actuator is realized. The right-angle turning of the flow channel and the length of the flow channel are greatly reduced, and the performance is improved.

Description

Technical Field

[0001] This application relates to the field of hydraulic transmission control, and particularly to a highly integrated electro-hydraulic actuator assembly formed by SLM molding. Background Technology

[0002] Electro-hydraulic actuators (EHAs) provide system flow by driving a hydraulic pump with an electric motor. Adjusting the motor speed and / or pump displacement changes the flow rate, resulting in a high degree of integration of mechanical, electrical, hydraulic, testing, and control systems. This fully leverages the high power-to-weight ratio of hydraulics and the control advantages of electric power. However, due to its highly integrated nature, it presents challenges such as the trade-off between high strength and lightweight design, and between high integration and low transmission efficiency. Achieving lightweight design while maintaining high strength, and further integration while meeting efficiency requirements, poses a significant challenge to the design of electro-hydraulic actuators. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention addresses the difficulty of achieving integration and lightweighting of EHA under traditional processing techniques by utilizing SLM technology to provide a design scheme for a highly integrated electro-hydraulic actuator assembly formed by SLM forming.

[0004] The technical solution adopted in this invention is as follows: This invention provides a highly integrated electro-hydraulic actuator assembly formed by SLM molding. The SLM-molded highly integrated electro-hydraulic actuator assembly is a single integrally formed unit, including: an SLM-molded housing, a motor interface, four oil replenishment channels, two overflow valve interfaces, two overflow channels, a check valve interface, a hydraulic cylinder end cap interface, three main flow channels, an oil tank end cap interface, a first control oil circuit, a hydraulically controlled check valve interface, an ear loop interface, an actuator, a displacement sensor magnetic ring, an oil tank, a through hole for the motor and gear pump shaft, a gear pump interface, and a miniature pressure sensor interface; the actuator housing is connected to the motor via the motor interface, and through… The one-way valve interface, hydraulic one-way valve interface, miniature pressure sensor interface, and first / second overflow valve interface, which are integrated with the housing, are connected to the one-way valve, hydraulic one-way valve, miniature pressure sensor, and overflow valve, respectively. They are connected to the gear pump through the gear pump interface, and the gear pump oil port is directly connected to the first replenishment channel, the first main channel, and the third main channel. The motor and gear pump are connected through the motor and gear pump shaft through the hole. The displacement sensor magnetic ring is installed in the actuator. The ear ring interface is integrated with the actuator for external fixing of the actuator. The oil tank end cap interface is integrated with the actuator for connecting the oil tank end cap. The remaining parts are interconnected through the flow channels and are integrated into the actuator design.

[0005] Furthermore, the gear pump is connected to the SLM forming housing through the gear pump interface, and the gear pump oil port is directly connected to the first replenishing oil channel, the first main channel, and the third main channel, without the need for external oil pipes.

[0006] Furthermore, the first and second relief valves are installed in the first / second relief valve mounting interfaces symmetrically arranged on both sides of the actuator, and miniature pressure sensors are respectively arranged at the relief valve positions.

[0007] Furthermore, the oil tank is integrated with the housing and positioned on the upper side of the actuator, directly connected to the second oil replenishment channel, so the system does not require an additional oil source during use.

[0008] Furthermore, the hydraulic control check valve is used to balance the uneven flow caused by the area of ​​the rod chamber and the rodless chamber. The hydraulic control check valve is arranged in the hydraulic control check valve interface located on the upper side of the actuator and on the opposite side of the oil tank.

[0009] Furthermore, the displacement sensor magnetic ring is installed inside the actuator cavity, and the piston rod serves as the displacement sensor measuring rod, with the displacement sensor built into the actuator housing.

[0010] Furthermore, the length of the actuator housing is determined by the actuator stroke, the width is mainly determined by the motor width, and the height is jointly determined by the actuator cavity and the height of the motor.

[0011] Furthermore, the system's oil replenishment channel, main flow channel, overflow channel, etc., are integrated with the actuator in a single design and form, so the system does not require additional oil circuit connections during use.

[0012] By adopting the above solution, the beneficial effects of the present invention are as follows:

[0013] This invention provides a highly integrated electro-hydraulic actuator assembly formed by SLM molding. Utilizing the high degree of forming freedom of SLM molding, the actuator, various valve component interfaces, oil tank, motor and pump interfaces are highly integrated, significantly improving the system's integration and weight reduction. Simultaneously, the displacement sensor is embedded within the actuator by using the displacement sensor probe as a piston rod and mounting the magnetic ring within the actuator cavity. Furthermore, the hydraulic circuitry is integrally formed with the housing, avoiding external oil circuitry and right-angle bends, thus reducing leakage risk and pressure loss. This invention has enormous development potential in aerospace, engineering machinery, and robotic systems. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0015] Figure 1 This is an isometric view of a highly integrated electro-hydraulic actuator assembly formed by SLM according to the present invention;

[0016] Figure 2This is a front view of a highly integrated electro-hydraulic actuator assembly formed by SLM according to the present invention;

[0017] Figure 3 This is a side view of a highly integrated electro-hydraulic actuator assembly formed by SLM according to the present invention;

[0018] Figure 4 This is a cross-sectional view of a highly integrated electro-hydraulic actuator assembly formed by SLM according to the present invention;

[0019] Figure 5 This is an isometric view of the flow channel of a highly integrated electro-hydraulic actuator assembly formed by SLM according to the present invention;

[0020] Figure 6 This is a hydraulic schematic diagram of a highly integrated electro-hydraulic actuator assembly formed by SLM according to the present invention;

[0021] In the diagram, 1 is the SLM molded housing, 2 is the motor interface, 3 is the first oil replenishment channel, 4 is the first overflow valve interface, 5 is the first overflow channel, 6 is the check valve interface, 7 is the hydraulic cylinder end cap interface, 8 is the first main channel, 9 is the second overflow channel, 10 is the second overflow valve interface, 11 is the oil tank end cap interface, 12 is the second oil replenishment channel, 13 is the first control oil circuit, 14 is the hydraulic check valve interface, 15 is the third oil replenishment channel, 16 is the lug interface, 17 is the actuator, 18 is the second main channel, 19 is the displacement sensor magnetic ring, 20 is the oil tank, 21 is the third main channel, 22 is the motor and gear pump shaft through hole, 23 is the fourth oil replenishment channel, 24 is the gear pump interface, and 25 is the miniature pressure sensor interface. Detailed Implementation

[0022] like Figure 1-6 As shown, this embodiment of the invention provides a highly integrated electro-hydraulic actuator assembly formed by SLM molding, including: an SLM molded housing 1, a motor interface 2, a first oil replenishment channel 3, a first overflow valve interface 4, a first overflow channel 5, a one-way valve interface 6, a hydraulic cylinder end cap interface 7, a first main flow channel 8, a second overflow channel 9, a second overflow valve interface 10, an oil tank end cap interface 11, a second oil replenishment channel 12, a first control oil circuit 13, a hydraulically controlled one-way valve interface 14, a third oil replenishment channel 15, an ear ring interface 16, an actuator 17, a second main flow channel 18, a displacement sensor magnetic ring mounting position 19, an oil tank 20, a third main flow channel 21, a through hole 22 for the motor and gear pump shaft, a fourth oil replenishment channel 23, a gear pump interface 24, and a miniature pressure sensor interface 25.

[0023] When the motor rotates forward, i.e., the piston rod moves outward under the force of the rodless chamber, oil is pumped out from the gear pump 24, enters the rodless chamber of the actuator 17 via the first main flow channel 8, and pushes the actuator outward. Oil in the rod chamber enters the gear pump 24 via the second main flow channel 18 and the third main flow channel 21 to complete oil circulation. Since the area of ​​the rodless chamber is larger than that of the rod chamber, oil is supplied to the gear pump 24 through the oil tank 20, the second replenishment flow channel 12, the check valve installed at the check valve port 6, and the first replenishment flow channel 3. When the motor rotates in reverse, i.e., the piston rod moves inward under the force of the rod chamber, oil is pumped out from the gear pump 24, enters the rod chamber of the actuator 17 via the third main flow channel 21 and the second main flow channel 18, and oil in the rodless chamber enters the gear pump 24 via the first main flow channel 8 to complete oil circulation. Because the area of ​​the rod chamber is smaller than that of the rodless chamber, excess oil returns to the oil tank 20 through the fourth replenishment channel 23, the hydraulic check valve installed in the hydraulic check valve interface 14, the third replenishment channel 15, and the second replenishment channel 12. When a high-pressure overload occurs in the hydraulic system, the rod chamber is depressurized and returns to the oil tank 20 through the third main channel 21, the first overflow channel 5, the first overflow valve installed in the first overflow valve interface 4, and the second replenishment channel 12; the rodless chamber is depressurized and returns to the oil tank 20 through the first main channel 8, the second overflow channel 9, the second overflow valve installed in the second overflow valve interface 10, and the second replenishment channel 12.

[0024] The actuator housing is connected to the motor via motor interface 2. It is connected to the check valve, hydraulic check valve, micro pressure sensor, and relief valve respectively via check valve interface 6, hydraulic check valve interface 14, micro pressure sensor interface 25, first relief valve interface 4, and second relief valve interface 10. It is also connected to the gear pump via gear pump interface 24. Simultaneously, the gear pump port is directly connected to the first replenishment channel 3, first main channel 8, and third main channel 21. The motor and gear pump are connected via a through-hole 22 on the motor and gear pump shaft. The displacement sensor magnetic ring is installed in the actuator at displacement sensor magnetic ring mounting position 19. The remaining parts are interconnected through flow channels and are integrated with the actuator design. The gear pump is connected to the SLM molded housing 1 via gear pump interface 24. Simultaneously, the gear pump port is directly connected to the first replenishment channel, first main channel, and third main channel, eliminating the need for external oil pipes. The first and second relief valves are symmetrically arranged on both sides of the actuator 17, and micro pressure sensors are positioned at the relief valve locations on both sides.

[0025] In this embodiment of the application, the main factors determining the size of the actuator housing are the piston area of ​​the actuator 17 and the relative positions of the motor and the pump. Therefore, the positions of these components need to be determined first during the design process to make the overall size as compact as possible, and then the remaining components are arranged in sequence.

[0026] In this embodiment of the application, since the oil in the actuator 17 will cause pollution if it flows directly back to the oil tank 20, a check valve installed in the check valve port 6 and a hydraulic check valve installed in the hydraulic check valve port 14 are used to ensure the oil flow. At the same time, the hydraulic check valve 14 can also balance the uneven flow between the rod chamber and the rodless chamber.

[0027] In this embodiment of the application, the oil tank 20 is integrated with the housing 1, contains an elastic bladder, is arranged on the upper side of the actuator 17, and is directly connected to the second oil replenishment channel 12. The system does not require an additional oil source during use.

[0028] In this embodiment of the application, the displacement sensor magnetic ring is installed in the actuator 17 cavity, and the piston rod serves as the displacement sensor measuring rod, with the displacement sensor built into the actuator housing.

[0029] In this embodiment of the application, the first relief valve and the second relief valve are arranged symmetrically to make the structure as compact as possible. At the same time, miniature pressure sensors are arranged at both locations to monitor the system pressure in real time. When a high-pressure overload occurs, the pressure can be automatically released through the relief valve.

[0030] In this embodiment of the application, unlike traditional processing methods, the flow channel connecting the SLM-formed actuator housing to the oil circuits of other components is embedded on the actuator surface, avoiding external oil circuits and right-angle turns, thus reducing leakage risk and pressure loss.

Claims

1. A highly integrated electro-hydraulic actuator assembly formed by SLM (Surface Mount Technology), characterized in that, The SLM-molded highly integrated electro-hydraulic actuator assembly is a single, integrally formed unit, comprising: an SLM-molded housing, a motor interface, four replenishment channels, two overflow valve interfaces, two overflow channels, a check valve interface, a hydraulic cylinder end cap interface, three main flow channels, an oil tank end cap interface, a first control oil circuit, a hydraulically controlled check valve interface, an ear loop interface, an actuator, a displacement sensor magnetic ring, an oil tank, a motor and gear pump shaft through-hole, a gear pump interface, and a miniature pressure sensor interface. The actuator housing connects to the motor via the motor interface. It connects to the check valve, hydraulically controlled check valve, miniature pressure sensor, and first / second overflow valve interfaces, respectively, via check valve interfaces, hydraulically controlled check valve interfaces, miniature pressure sensor interfaces, and first / second overflow valve interfaces integrated into the housing. It connects to the gear pump via the gear pump interface, and the gear pump port is directly connected to the first replenishment channel, the first main flow channel, and the third main flow channel. The motor and gear pump are connected via a motor and gear pump shaft through-hole. The sensor magnetic ring is installed inside the actuator. The ear ring interface is integrated with the actuator for external fixation. The oil tank end cap interface is integrated with the actuator for connecting the oil tank end cap. The remaining parts are interconnected through flow channels and are integrated with the actuator. The system's replenishment flow channel, main flow channel, and overflow flow channel are integrated with the actuator and formed as a whole, so the system does not require additional oil circuit connections during use. The hydraulically controlled check valve is used to balance the uneven flow caused by the area of ​​the rod chamber and the rodless chamber. The hydraulically controlled check valve is located on the upper side of the actuator, in the hydraulically controlled check valve interface on the opposite side of the oil tank. The displacement sensor magnetic ring is installed in the actuator cavity. The piston rod serves as the displacement sensor measuring rod, and the displacement sensor is built into the actuator housing. The length of the actuator housing is determined by the actuator stroke, the width is mainly determined by the motor width, and the height is determined by the combined height of the actuator cavity and the motor.

2. The highly integrated electro-hydraulic actuator assembly formed by SLM according to claim 1, characterized in that, The gear pump is connected to the SLM forming housing through the gear pump interface, and the gear pump oil port is directly connected to the first replenishment oil channel, the first main channel, and the third main channel, without the need for external oil pipes.

3. A highly integrated electro-hydraulic actuator assembly formed by SLM according to claim 1, characterized in that, The first and second relief valves are installed in the first / second relief valve mounting interfaces symmetrically arranged on both sides of the actuator, and miniature pressure sensors are respectively arranged at the relief valve positions.

4. A highly integrated electro-hydraulic actuator assembly formed by SLM according to claim 1, characterized in that, The oil tank is integrated with the housing and is located on the upper side of the actuator. It is directly connected to the second oil replenishment channel, so the system does not require an additional oil source during use.

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