Lightweight compact electro-hydrostatic actuator shell based on additive manufacturing

Abstract

The invention discloses a lightweight compact electro-hydrostatic actuator shell based on additive manufacturing. The lightweight compact electro-hydrostatic actuator shell comprises an oil tank shell, a hydraulic pump connector, six flow channels, two one-way valve connectors, an actuator shell body, an actuator end cover connector, two overflow valve connectors, a displacement sensor connector, an oil tank opening cover, a motor connector and an external oil way connector. The oil tank part of the actuator shell is connected with the hydraulic pump through a flow channel, the actuator part of the actuator shell is connected with the hydraulic pump through a flow channel, the actuator part of the actuator shell is connected with the oil tank part through a flow channel, the actuator shell is connected with the overflow valves through flow channels, and the two overflow valves are communicated with each other. The additive manufacturing technology is applied to forming and manufacturing of the electro-hydrostatic actuator, a plurality of elements are designed in an integrated mode, the integration degree of element arrangement is greatly improved, and the weight of the system is reduced; and meanwhile, the layout of the flow channel is carried out, so that the production of process holes is reduced, the leakage probability is reduced, the pressure loss of the flow channel is reduced, and the efficiency 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 lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing. Background Art

[0002] The Electrical-Hydraulic Actuator (EHA) is a representative electromechanical actuator system that highly integrates mechanical components, hydraulic components, electrical components, and other components, and adds testing and control technology, 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 with a relatively complex structure, traditional processing methods are greatly restricted, making it difficult to achieve its personalized, integrated, and lightweight requirements. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention addresses the problem that it is difficult to achieve lightweight EHA under traditional processing technology, and uses additive manufacturing technology to provide a lightweight and compact electrostatic hydraulic actuator housing design solution based on additive manufacturing.

[0004] The technical solution adopted by the present invention is as follows:

[0005] The present invention provides a lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing, wherein the lightweight and compact electrostatic hydraulic actuator housing is an indivisible, integrally formed whole formed by additive manufacturing, comprising: an oil tank housing, a hydraulic pump interface, a first flow channel, a first one-way valve interface, an actuator housing, an actuator end cover interface, a second flow channel, a first overflow valve interface, a second overflow valve interface, a second one-way valve interface, a third flow channel, a displacement sensor interface, a fourth flow channel, an oil tank cover, a motor interface, a fifth flow channel, a sixth flow channel and an external oil circuit interface; the oil tank portion of the actuator housing is connected to the hydraulic pump through the fourth flow channel / first flow channel, the actuator portion of the actuator housing is connected to the hydraulic pump through the fifth flow channel / sixth flow channel, the actuator portion of the actuator housing is connected to the oil tank portion through the sixth flow channel / fifth flow channel, the actuator housing is connected to the overflow valve through the second flow channel / third flow channel, and the two overflow valves are connected.

[0006] Furthermore, the oil tank housing surrounds a portion of the first, fourth and sixth flow channels and all of the first and second one-way valve interfaces.

[0007] Furthermore, the actuator housing is located below the oil tank housing, the first and second overflow valve jacks are located on one side of the actuator housing and arranged up and down, and the fifth flow channel is integrated on the other side of the actuator housing.

[0008] Furthermore, the length of the actuator housing is mainly determined by the length of the actuator and the length of the displacement sensor, the width of the actuator housing is mainly determined by the width of the motor, and the height is mainly determined by the heights of the actuator and the motor.

[0009] Furthermore, one end of the actuator housing is connected to the hydraulic pump through two threaded holes, and the other end is connected to the motor through four threaded holes.

[0010] Furthermore, the first overflow valve socket and the second overflow valve socket have the same structure, and both include an opening, an oil inlet hole, an oil outlet hole, and two threaded holes.

[0011] Furthermore, the actuator housing is connected to the displacement sensor via a thread, the measuring rod is located in the hollow piston rod, and the measuring head is fixed on the piston.

[0012] Furthermore, the actuator housing includes an oil inlet / outlet hole, an assembly hole, a threaded hole, a cylinder, and an oil groove. When the actuator piston rod is retracted into the cylinder, an oil groove is opened at the end of the cylinder away from the piston, an oil inlet / outlet hole connected to the fifth flow channel is opened on the oil groove surface, and an oil inlet / outlet hole connected to the sixth flow channel is opened at the end close to the piston.

[0013] By adopting the above scheme, the beneficial effects of the present invention are as follows:

[0014] The present invention provides a lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing. The actuator, oil circuit, oil tank, safety valve and overflow valve interface, and sensor interface are highly integrated using additive manufacturing technology, which greatly improves the system's integration and space utilization. Compared with traditional processing methods, the use of bolts and other connectors is reduced, and the risk of hydraulic oil leakage is reduced. Through the planning of the flow path, the process holes formed by the traditional processing method are eliminated, and the right-angle turns are converted into arc transitions, shortening the flow channel length, reducing pressure loss, and improving efficiency. It has great development potential in the fields of aerospace vehicles, robotic systems, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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:

[0016] Figure 1 is a first isometric view of a lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing provided by the present invention;

[0017] Figure 2 It is a front view of a lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing provided by the present invention;

[0018] Figure 3 It is a top view of a lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing provided by the present invention;

[0019] Figure 4 is a second isometric view of a lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing provided by the present invention;

[0020] Figure 5 is a cross-sectional view of a lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing provided by the present invention;

[0021] Figure 6 It is a stereoscopic diagram of a lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing provided by the present invention.

[0022] In the figure, there are oil tank housing 1, hydraulic pump interface 2, first flow channel 3, first one-way valve interface 4, actuator housing 5, actuator end cover interface 6, second flow channel 7, first overflow valve interface 8, second overflow valve interface 9, second one-way valve interface 10, third flow channel 11, displacement sensor interface 12, fourth flow channel 13, oil tank cover 14, motor interface 15, fifth flow channel 16, sixth flow channel 17, and external oil circuit interface 18. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] like Figure 1-6 As shown, an embodiment of the present invention provides a lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing, including: a tank housing 1, a hydraulic pump interface 2, a first flow channel 3, a first one-way valve interface 4, an actuator housing 5, an actuator end cover interface 6, a second flow channel 7, a first overflow valve interface 8, a second overflow valve interface 9, a second one-way valve interface 10, a third flow channel 11, a displacement sensor interface 12, a fourth flow channel 13, a tank cover 14, a motor interface 15, a fifth flow channel 16, a sixth flow channel 17 and an external oil circuit interface 18.

[0025] When the motor rotates forward, the hydraulic oil in the oil tank enters the hydraulic pump through the second one-way valve interface 10 through the fourth flow channel 13, and the hydraulic pump output oil enters the actuator through the external oil circuit at the external oil circuit interface 18 through the fifth flow channel 16, and the oil in the other chamber of the actuator piston rod is merged into the fourth flow channel 13 through the sixth flow channel 17 to replenish oil to the hydraulic pump; when the motor rotates reversely, the hydraulic oil in the oil tank enters the hydraulic pump through the first one-way valve interface 4 through the first flow channel 3 and the external oil circuit, and the hydraulic pump output oil enters the actuator through the sixth flow channel 17, and the oil in the other chamber of the actuator piston rod is replenished to the hydraulic pump through the fifth flow channel 16 and the external oil circuit. When the hydraulic system is overloaded by high pressure, it is unloaded through the second flow channel 7 and the third flow channel 11 through the first overflow valve interface 8 and the second overflow valve interface 9. The actuator housing 5 is connected to the hydraulic pump by threads through the hydraulic pump interface 2, connected to the motor by threads through the motor interface 15, and connected to the displacement sensor through the displacement sensor interface 12, and the displacement sensor probe is located inside the piston rod.

[0026] In the present embodiment of the application, the main factors determining the size of the actuator housing 5 are the size of the actuator housing 5 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 so that the overall size is as small as possible, and then arrange the remaining components in sequence as compactly as possible.

[0027] In the present embodiment of the application, the oil tank housing 1 is one of the components with relatively flexible position arrangement. On the basis of determining the position of the above components, it can be arranged as much as possible within the envelope volume to fully utilize the space. Placing it between the motor and the pump can increase the stability of the connection between the motor and the pump and play an auxiliary connection role. On the other hand, it can reduce the length of the flow channel, thereby reducing pressure loss. However, it should be noted that the oil height in the oil tank needs to be higher than the height of the first one-way valve interface 4 and the second one-way valve interface 10, otherwise the oil in the oil tank may be difficult to participate in the oil circuit circulation due to gravity when it is placed upright.

[0028] In the embodiments of the present application, Figure 5 It is a cross-sectional view of the actuator housing provided by the present invention. The actuator housing 5 includes oil inlet / outlet holes, a displacement sensor interface 12, a threaded hole, a cylinder, an oil tank, etc. Different from the traditional processing method, the part of the flow channel of the additively manufactured actuator housing 5 connected to the oil circuit of other components is embedded on the surface of the actuator. When the actuator piston rod is retracted into the cylinder, the end away from the piston is connected to the fifth flow channel 16, and the end close to the piston is connected to the sixth flow channel 17. The actuator cylinder is connected to the first overflow valve interface 8 and the second overflow valve interface 9. When the pressure in the cylinder is too high, the pressure is relieved through the second flow channel 7 and the third flow channel 11.

[0029] The specific embodiments described herein are merely examples of the present invention. A person skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0030] Although the terms such as staircase and net height are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing, characterized in that: The lightweight and compact electrostatic hydraulic actuator housing is an indivisible, integrally formed whole formed by additive manufacturing, including: a tank housing, a hydraulic pump interface, a first flow channel, a first one-way valve interface, an actuator housing, an actuator end cover interface, a second flow channel, a first overflow valve interface, a second overflow valve interface, a second one-way valve interface, a third flow channel, a displacement sensor interface, a fourth flow channel, a tank cover, a motor interface, a fifth flow channel, a sixth flow channel and an external oil circuit interface; the tank portion of the actuator housing is connected to the hydraulic pump through the fourth flow channel / first flow channel, the actuator portion of the actuator housing is connected to the hydraulic pump through the fifth flow channel / sixth flow channel, the actuator portion of the actuator housing is connected to the tank portion through the sixth flow channel / fifth flow channel, the actuator housing is connected to the overflow valve through the second flow channel / third flow channel, and the two overflow valves are connected.

2. A lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing according to claim 1, characterized in that: The oil tank housing surrounds a portion of the first, fourth and sixth flow channels and all of the first and second one-way valve interfaces.

3. A lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing according to claim 1, characterized in that: The actuator housing is located below the oil tank housing, the first and second overflow valve jacks are located on one side of the actuator housing and arranged up and down, and the fifth flow channel is integrated on the other side of the actuator housing.

4. A lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing according to claim 1, characterized in that: The length of the actuator housing is mainly determined by the length of the actuator and the length of the displacement sensor, the width of the actuator housing is mainly determined by the width of the motor, and the height is mainly determined by the heights of the actuator and the motor.

5. A lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing according to claim 1, characterized in that: One end of the actuator housing is connected to the hydraulic pump through two threaded holes, and the other end is connected to the motor through four threaded holes.

6. A lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing according to claim 1, characterized in that: The first overflow valve socket and the second overflow valve socket have the same structure, and both include an opening, an oil inlet hole, an oil outlet hole, and two threaded holes.

7. A lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing according to claim 1, characterized in that: The actuator housing is connected to the displacement sensor through a thread, the measuring rod is located in the hollow piston rod, and the measuring head is fixed on the piston.

8. The lightweight and compact electrostatic hydraulic actuator housing based on additive manufacturing according to claim 1, characterized in that: The actuator housing includes an oil inlet / outlet hole, an assembly hole, a threaded hole, a cylinder, and an oil groove. When the actuator piston rod is retracted into the cylinder, an oil groove is opened at the end of the cylinder away from the piston, an oil inlet / outlet hole connected to the fifth flow channel is opened on the oil groove surface, and an oil inlet / outlet hole connected to the sixth flow channel is opened at the end close to the piston.

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