SLM formed high-integration electro-hydraulic actuator assembly

Abstract

The embodiment of the invention discloses an SLM (selective laser melting) formed high-integration electro-hydraulic actuator assembly which is an integrally formed whole, and an actuator shell is connected with a motor through a motor interface. The hydraulic control system is respectively connected with a one-way valve, a hydraulic control one-way valve interface, a miniature pressure sensor interface and a first / second overflow valve interface through one-way valves, hydraulic control one-way valves, miniature pressure sensors and overflow valves, and is connected with a gear pump through a gear pump interface, and meanwhile, an oil port of the gear pump is directly connected with a first oil supplementing flow channel, a first main flow channel and a third main flow channel; the motor and the gear pump are connected through a motor and gear pump shaft penetrating hole, the displacement sensor magnetic ring is installed in the actuator, and the rest parts are communicated with each other through a flow channel and integrally designed with the actuator. The SLM forming technology is applied to forming and manufacturing of the electro-hydraulic actuator, and multi-element high integration of the electro-hydraulic actuator is achieved; runner right-angle turning and runner length of the runner are greatly reduced, and performance is improved.

Description

Technical Field

[0001] The embodiments of the present application belong to the field of hydraulic transmission control, and in particular to a highly integrated electro-hydraulic actuator assembly formed by SLM. Background Art

[0002] The Electrical-Hydraulic Actuator (EHA) provides system flow through a motor-driven hydraulic pump, adjusts the motor speed and (or) the pump displacement to change the flow, and highly integrates mechanical, electrical, hydraulic, testing and control, giving full play to the control advantages of hydraulic high power-to-weight ratio and electric control. However, since it is a highly integrated component, there are contradictions such as high strength and light weight, high integration and low transmission efficiency. How to achieve light weight while ensuring high strength, and further integration while meeting efficiency, this poses a great challenge to the design of electro-hydraulic actuators. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention addresses the problem that EHA is difficult to integrate and lightweight under traditional processing technology, and uses SLM technology to provide a design solution for a highly integrated electro-hydraulic actuator component formed by SLM.

[0004] The technical solution adopted in the present invention is as follows: An embodiment of the present invention provides a highly integrated electro-hydraulic actuator assembly formed by SLM, wherein the highly integrated electro-hydraulic actuator assembly formed by SLM is an integrally formed whole, including: an SLM formed housing, a motor interface, four oil replenishment channels, two overflow valve interfaces, two overflow channels, a one-way valve interface, a hydraulic cylinder end cover interface, three main channels, an oil tank end cover interface, a first control oil circuit, a hydraulically controlled one-way valve interface, an earring interface, an actuator, a displacement sensor magnetic ring, an oil tank, a motor and a gear pump shaft perforation, a gear pump interface and a micro pressure sensor interface; the actuator housing is connected to the motor through the motor interface, and The one-way valve interface, hydraulic one-way valve interface, micro pressure sensor interface and first / second relief valve interface designed integrally with the housing are respectively connected to the one-way valve, hydraulic one-way valve, micro pressure sensor and relief valve, and are connected to the gear pump through the gear pump interface. At the same time, the gear pump oil port is directly connected to the first oil replenishment channel, the first main channel and the third main channel. The motor and the gear pump are connected through the through-holes of the motor and gear pump shafts. The displacement sensor magnetic ring is installed in the actuator. The earring interface is integrated with the actuator and is used to externally fix the actuator. The oil tank end cover interface is integrated with the actuator and is used to connect the oil tank end cover. The remaining parts are interconnected through the flow channels and are designed as one piece with the actuator.

[0005] Furthermore, the gear pump is connected to the SLM forming housing via a gear pump interface, and the gear pump oil port is directly connected to the first oil replenishment channel, the first main channel, and the third main channel, without the need for an external oil pipe.

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

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

[0008] Furthermore, the hydraulically controlled one-way valve is used to balance the uneven flow caused by the area of ​​the rod cavity and the rodless cavity, and the hydraulically controlled one-way valve is arranged in a hydraulically controlled one-way valve interface located on the upper side of the actuator and opposite to the oil tank.

[0009] Furthermore, the displacement sensor magnetic ring is installed in the actuator cavity, the piston rod is used as the displacement sensor measuring rod, and the displacement sensor is 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 determined by the height of the actuator cavity and the motor.

[0011] Furthermore, the oil replenishment channel, main channel, overflow channel, etc. of the system are designed and formed in an integrated manner with the actuator, and the system does not require additional oil circuit connection when in use.

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

[0013] The present invention provides a highly integrated electro-hydraulic actuator assembly formed by SLM, which utilizes the high forming freedom of SLM forming to highly integrate the actuator, various valve component interfaces, oil tanks, motor and pump interfaces, etc., greatly improving the system's integration and lightweight. At the same time, the displacement sensor is built into the actuator by using the displacement sensor measuring rod as the piston rod and installing the magnetic ring in the actuator cavity. At the same time, the hydraulic oil circuit is formed integrally with the housing to avoid external oil circuits and right-angle turns, reducing the risk of leakage and pressure loss. It has huge development potential in the fields of aerospace, engineering machinery, and robotic systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

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

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

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

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

[0020] Figure 6 It is a hydraulic principle diagram of a highly integrated electro-hydraulic actuator assembly formed by SLM provided by the present invention;

[0021] In the figure, the SLM formed shell 1, the motor interface 2, the first oil supply channel 3, the first overflow valve interface 4, the first overflow channel 5, the one-way valve interface 6, the hydraulic cylinder end cover interface 7, the first main channel 8, the second overflow channel 9, the second overflow valve interface 10, the oil tank end cover interface 11, the second oil supply channel 12, the first control oil circuit 13, the hydraulic control one-way valve interface 14, the third oil supply channel 15, the earring interface 16, the actuator 17, the second main channel 18, the displacement sensor magnetic ring 19, the oil tank 20, the third main channel 21, the motor and gear pump shaft perforation 22, the fourth oil supply channel 23, the gear pump interface 24, and the micro pressure sensor interface 25. DETAILED DESCRIPTION

[0022] like Figure 1-6 As shown, an embodiment of the present invention provides a highly integrated electro-hydraulic actuator assembly formed by SLM, including: an SLM formed 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 cover interface 7, a first main channel 8, a second overflow channel 9, a second overflow valve interface 10, an oil tank end cover 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 earring interface 16, an actuator 17, a second main channel 18, a displacement sensor magnetic ring installation position 19, an oil tank 20, a third main channel 21, a motor and a gear pump shaft through hole 22, a fourth oil replenishment channel 23, a gear pump interface 24 and a micro pressure sensor interface 25.

[0023] When the motor rotates forward, that is, the piston rod moves outward due to the force of the rodless cavity, the oil is pumped out from the gear pump 24, through the first main flow channel 8, into the rodless cavity of the actuator 17, and pushes the actuator to move outward. The rod cavity oil enters the gear pump 24 through the second main flow channel 18 and the third main flow channel 21 to complete the oil circulation. Since the area of ​​the rodless cavity is larger than the rod cavity, the gear pump 24 is replenished with oil through the oil tank 20, the second oil replenishment flow channel 12, the one-way valve installed on the one-way valve interface 6, and the first oil replenishment flow channel 3; when the motor rotates backward, that is, the piston rod moves inward due to the force of the rod cavity, the oil is pumped out from the gear pump 24, through the third main flow channel 21 and the second main flow channel 18, into the rod cavity of the actuator 17, and the rodless cavity oil enters the gear pump 24 through the first main flow channel 8 to complete the oil circulation. Since the area of ​​the rod chamber is smaller than that of the rodless chamber, the excess oil returns to the oil tank 20 through the fourth oil replenishment channel 23, the hydraulically controlled one-way valve installed in the hydraulically controlled one-way valve interface 14, the third oil replenishment channel 15, and the second oil replenishment channel 12. When the hydraulic system is overloaded with high pressure, the rod chamber is depressurized back to the oil tank 20 through the third main flow channel 21, the first overflow flow channel 5, the first overflow valve installed in the first overflow valve interface 4, and the second oil replenishment channel 12; the rodless chamber is depressurized back to the oil tank 20 through the first main flow channel 8, the second overflow flow channel 9, the second overflow valve installed in the second overflow valve interface 10, and the second oil replenishment channel 12.

[0024] The actuator housing is connected to the motor through the motor interface 2, and is connected to the one-way valve, the hydraulic one-way valve interface 14, the micro pressure sensor interface 25, the first overflow valve interface 4 and the second overflow valve interface 10 respectively. It is connected to the gear pump through the gear pump interface 24, and the gear pump oil port is directly connected to the first oil replenishment channel 3, the first main channel 8, and the third main channel 21. The motor and the gear pump are connected through the motor and gear pump shaft perforation 22. The displacement sensor magnetic ring is installed at the displacement sensor magnetic ring installation position 19 in the actuator, and the remaining parts are interconnected through the channel and are designed as a whole with the actuator. The gear pump is connected to the SLM forming housing 1 through the gear pump interface 24, and the gear pump oil port is directly connected to the first oil replenishment channel, the first main channel, and the third main channel, without the need for an external oil pipe. The first / second overflow valves are symmetrically arranged on both sides of the actuator 17, and micro pressure sensors are arranged at the overflow valve positions.

[0025] In the present 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, during the design, it is necessary to first determine the positions of these components to make the overall size as compact as possible, and then arrange the remaining components in sequence.

[0026] In the present embodiment of the application, since the oil in the actuator 17 directly flows back to the oil tank 20 and causes pollution, a one-way valve installed in the one-way valve interface 6 and a hydraulically controlled one-way valve installed in the hydraulically controlled one-way valve interface 14 are used to ensure the oil flow. At the same time, the hydraulically controlled one-way valve 14 can also balance the imbalance of the flow between the rod chamber and the rodless chamber.

[0027] In the present embodiment of the application, the oil tank 20 is integrated with the housing 1, has an elastic bladder installed inside, 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 when in use.

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

[0029] In the present embodiment of the application, the first overflow valve and the second overflow valve are arranged symmetrically to make the structure as compact as possible. At the same time, micro 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 overflow valve.

[0030] In the present embodiment of the application, different from the traditional processing method, part of the flow passage of the SLM-formed actuator housing connected with the oil circuits of other components is embedded on the actuator surface, avoiding external oil circuits and right-angle turns, and reducing the risk of leakage and pressure loss.

Claims

1. A highly integrated electro-hydraulic actuator component formed by SLM, characterized in that: The SLM-formed high-integrated electro-hydraulic actuator assembly is an integrally formed whole, including: an SLM-formed housing, a motor interface, four oil replenishment channels, two overflow valve interfaces, two overflow channels, a one-way valve interface, a hydraulic cylinder end cover interface, three main channels, an oil tank end cover interface, a first control oil circuit, a hydraulically controlled one-way valve interface, an earring interface, an actuator, a displacement sensor magnetic ring, an oil tank, a motor and a gear pump shaft perforation, a gear pump interface and a micro pressure sensor interface; the actuator housing is connected to the motor through the motor interface, and is connected to the motor through the one-way valve interface and the hydraulically controlled one-way valve interface integrated with the housing. , micro pressure sensor interface, the first / second overflow valve interface are respectively connected to the one-way valve, the hydraulic one-way valve, the micro pressure sensor, and the overflow valve, and are connected to the gear pump through the gear pump interface. At the same time, the gear pump oil port is directly connected to the first oil replenishment channel, the first main channel, and the third main channel. The motor and the gear pump are connected through the through holes of the motor and gear pump shafts. The displacement sensor magnetic ring is installed in the actuator. The earring interface and the actuator are integrated with the design for external fixing of the actuator. The oil tank end cover interface and the actuator are integrated with the design for connecting the oil tank end cover. The remaining parts are interconnected through the flow channel and are designed as an integrated whole with the actuator.

2. According to the SLM-formed highly integrated electro-hydraulic actuator assembly of claim 1, it is characterized in that: The gear pump is connected to the SLM forming housing via a gear pump interface, and the gear pump oil port is directly connected to the first oil replenishment channel, the first main channel, and the third main channel, without the need for an external oil pipe.

3. According to the SLM-formed highly integrated electro-hydraulic actuator assembly of claim 1, it is characterized in that: The first overflow valve and the second overflow valve are installed in the first / second overflow valve installation interfaces which are symmetrically arranged on both sides of the actuator, and micro pressure sensors are respectively arranged at the overflow valve positions.

4. According to the SLM-formed highly integrated electro-hydraulic actuator assembly of claim 1, it is characterized in that: The oil tank is designed to be integrated with the housing, arranged on the upper side of the actuator, and directly connected to the second oil replenishment channel. The system does not require an additional oil source when in use.

5. According to the SLM-formed highly integrated electro-hydraulic actuator assembly of claim 1, it is characterized in that: The hydraulically controlled one-way valve is used to balance the uneven flow caused by the area of ​​the rod cavity and the rodless cavity. The hydraulically controlled one-way valve is arranged in a hydraulically controlled one-way valve interface located on the upper side of the actuator and opposite to the oil tank.

6. According to the SLM-formed highly integrated electro-hydraulic actuator assembly of claim 1, it is characterized in that: The displacement sensor magnetic ring is installed in the actuator cavity, the piston rod is used as the displacement sensor measuring rod, and the displacement sensor is built into the actuator housing.

7. According to the SLM-formed highly integrated electro-hydraulic actuator assembly of claim 1, it is characterized in that: 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 height of the actuator cavity and the motor.

8. According to the SLM-formed highly integrated electro-hydraulic actuator assembly of claim 1, it is characterized in that: The system's oil replenishment channel, main channel, overflow channel, etc. are designed and formed in an integrated manner with the actuator, and the system does not require additional oil circuit connections when in use.

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