A lightweight electrostatic hydraulic actuator housing formed by SLM

Abstract

The embodiment of the present application discloses a lightweight electrostatic hydraulic actuator housing formed by SLM, wherein the lightweight electrostatic hydraulic actuator housing formed by SLM is an integral and indivisible whole, the hydraulic pump oil inlet / outlet on the hydraulic pump housing is respectively connected to the left end of the directional valve socket and the first overflow valve socket through the first flow channel and the second flow channel, the hydraulic pump oil inlet / outlet on the hydraulic pump housing is respectively connected to the right end of the directional valve socket and the second overflow valve socket through the third flow channel and the fourth flow channel, one end of the hydraulic cylinder housing is connected to the first overflow valve socket through the sixth flow channel, and the other end of the hydraulic cylinder housing is connected to the second overflow valve socket through the fifth flow channel. The present invention applies SLM rapid prototyping technology to the forming and manufacturing of the EHA housing, thereby re-arranging the overall components of the EHA housing, re-designing the housing structure, and re-planning the flow path, integrating the component housings dispersed under traditional processing into one, improving space utilization, and significantly reducing the weight of the EHA housing.

Description

Technical Field

[0001] The embodiments of the present application belong to the field of hydraulic transmission control, and in particular to a lightweight electrostatic hydraulic actuator housing formed by SLM. Background Art

[0002] As a typical integrated actuator based on hydraulic transmission, the electrostatic hydraulic actuator (EHA) is widely used in the fields of aircraft hydraulic systems, robot power systems, etc. These industries have set very high requirements on the personalization, miniaturization, and integration of the EHA used. Starting from the processing technology is one form of implementation. However, due to the limitations of traditional processing methods, it is difficult for the currently known EHA to make new breakthroughs in the above requirements. Summary of the invention

[0003] In view of this, the embodiment of the present invention addresses the problem that it is difficult to achieve lightweight EHA under traditional processing technology, uses SLM technology to rearrange the components of EHA, and provides an SLM-formed lightweight electrostatic hydraulic actuator housing.

[0004] The technical solution adopted in the embodiment of the present invention is as follows:

[0005] An embodiment of the present invention provides a lightweight electrostatic hydraulic actuator housing formed by SLM, wherein the lightweight EHA housing formed by SLM is an integral and indivisible whole and comprises: a hydraulic pump housing, a directional valve socket, a first overflow valve socket, a second overflow valve socket, and a hydraulic cylinder housing; the hydraulic pump oil inlet / outlet on the hydraulic pump housing is connected to the left end of the directional valve socket and the first overflow valve socket via a first flow channel and a second flow channel respectively, the hydraulic pump oil inlet / outlet on the hydraulic pump housing is connected to the right end of the directional valve socket and the second overflow valve socket via a third flow channel and a fourth flow channel respectively, one end of the hydraulic cylinder housing is connected to the first overflow valve socket via a sixth flow channel, and the other end of the hydraulic cylinder housing is connected to the second overflow valve socket via a fifth flow channel.

[0006] Furthermore, it also includes an oil tank shell, which semi-surrounds most of the hydraulic cylinder shell, part of the hydraulic pump shell, part of the first, second, third, and fourth flow channels, all of the fifth and sixth flow channels, and all of the first and second overflow valve jacks.

[0007] Furthermore, the hydraulic cylinder housing is located above the hydraulic pump housing and the directional valve socket, and the first and second overflow valve sockets are located on both sides of the hydraulic cylinder housing and above the directional valve socket.

[0008] Furthermore, the length of the SLM-formed lightweight electrostatic-hydraulic actuator housing is mainly determined by the length of the hydraulic cylinder, that is, the left and right ends of the hydraulic cylinder are ensured to be the leftmost and rightmost ends of the SLM-formed lightweight electrostatic-hydraulic actuator housing, and the width of the SLM-formed lightweight electrostatic-hydraulic actuator housing is mainly determined by the width of the hydraulic pump, and the height is mainly determined by the heights of the hydraulic cylinder and the hydraulic pump.

[0009] Furthermore, a threaded hole connected to the coupling is formed at one end of the hydraulic pump housing, and a crescent-shaped hydraulic pump oil inlet / outlet is formed at the other end.

[0010] Furthermore, the directional valve socket includes two openings, four threaded holes and three oil holes.

[0011] Furthermore, the left and right ends of the directional valve socket are respectively provided with openings for installing the directional valve body, the planes where the two openings are located are respectively provided with two threaded holes for assembly and sealing, two first oil holes and second oil holes for oil inlet / outlet are respectively provided near the left and right openings, and a third oil hole for connecting with the oil tank is provided in the middle part.

[0012] 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.

[0013] Furthermore, an opening for installing the relief valve body is formed at the upper end of the relief valve socket, two threaded holes for assembly are formed on the plane where the opening is located, and an oil inlet / outlet hole is formed on the side located on one side of the directional valve socket.

[0014] Furthermore, the hydraulic cylinder housing includes a cylinder barrel and an oil groove. When the hydraulic cylinder piston rod is retracted into the cylinder barrel, an oil groove is opened at the end of the cylinder barrel 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.

[0015] By adopting the above solution, the beneficial effects brought by the embodiment of the present invention are as follows:

[0016] The present invention provides a lightweight EHA shell formed by SLM. The use of SLM technology allows the overall components of the EHA shell to be rearranged. The hydraulic cylinder shell is located above the hydraulic pump shell and the directional valve socket, and the first and second overflow valve sockets are located on both sides of the hydraulic cylinder shell and above the directional valve socket. The overall arrangement is compact and reasonable, which greatly improves the space utilization rate; the shell structure is redesigned, and different from the dispersed component shells under the traditional processing method, the lightweight EHA shell formed by SLM technology is a whole, which reduces the use of bolts and reduces the risk of hydraulic oil leakage; the flow path is replanned, eliminating the process holes formed by the traditional processing method, changing the right-angle turn into a circular arc transition, shortening the flow path length, reducing the pressure loss, and improving the efficiency. It has great application potential in aircraft hydraulic systems and robot power systems and other occasions with high space and weight requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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:

[0018] Figure 1 It is an isometric view of a lightweight electrostatic hydraulic actuator housing formed by SLM provided by the present invention;

[0019] Figure 2 This is a front view of a lightweight electrostatic hydraulic actuator housing formed by SLM provided by the present invention;

[0020] Figure 3 It is a top view of a lightweight electrostatic hydraulic actuator housing formed by SLM provided by the present invention;

[0021] Figure 4 It is an isometric view of a lightweight electrostatic hydraulic actuator housing (excluding part of the oil tank and the hydraulic pump housing) formed by SLM provided by the present invention;

[0022] Figure 5 is a cross-sectional view of a hydraulic cylinder housing provided by the present invention;

[0023] In the figure, a hydraulic pump housing 1, a directional valve socket 2, a first overflow valve socket 3, a hydraulic cylinder housing 4, an oil tank housing 5, a first flow channel 6, a second flow channel 7, a third flow channel 8, a fourth flow channel 9, a hydraulic pump oil inlet / outlet 10, a hydraulic pump mounting shaft 11, a mounting threaded hole 12, a sixth flow channel 13, a fifth flow channel 14, a hydraulic cylinder mounting head 15, a second overflow valve socket 16, an oil hole 17, and an oil groove 18. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0025] like Figure 1-4 As shown, an embodiment of the present invention provides a lightweight electrostatic hydraulic actuator housing formed by SLM, including: a hydraulic pump housing 1, a directional valve socket 2, a first overflow valve socket 3, a second overflow valve socket 16, and a hydraulic cylinder housing 4; the hydraulic pump oil inlet / outlet 10 on the hydraulic pump housing 1 is respectively connected to the left end of the directional valve socket 2 and the first overflow valve socket 3 through the first flow channel 6 and the second flow channel 7, the hydraulic pump oil inlet / outlet 10 on the hydraulic pump housing 4 is respectively connected to the right end of the directional valve socket 2 and the second overflow valve socket 16 through the third flow channel 8 and the fourth flow channel 9, one end of the hydraulic cylinder housing 4 is connected to the first overflow valve socket 3 through the sixth flow channel 13, and the other end of the hydraulic cylinder housing 4 is connected to the second overflow valve socket 16 through the fifth flow channel 14, the entire housing is threadedly connected to other parts of the component through the mounting threaded hole 12, and the other parts of the hydraulic pump are positioned and fixed by the hydraulic pump mounting shaft 11 when installed to the hydraulic pump housing 1.

[0026] In the embodiment of the present application, the EHA structure needs to meet multiple constraints. For example, in terms of assembly, it should meet the assembly requirements of the length and diameter of the hydraulic cylinder housing 4 and the piston rod; the assembly requirements of the first overflow valve jack 3, the second overflow valve jack 16 and the respective overflow valve spools, the directional valve jack 2 and the directional valve spools, etc. In terms of the working principle, it should be ensured that the left and right ends of the hydraulic cylinder housing 4 are the leftmost and rightmost ends of the lightweight EHA housing formed by the SLM, otherwise its movement will be interfered.

[0027] In the embodiment of the present application, the most important elements that determine the length, width and height of the EHA housing are the hydraulic cylinder housing 4 and the hydraulic pump housing 1. Therefore, during the design process, the positions of these two elements must be arranged first. Considering that the overall volume must be reduced as much as possible, the housings of the hydraulic components must be as compact as possible while meeting the working requirements.

[0028] In the embodiment of the present application, the first overflow valve hole 3, the second overflow valve hole 16 and the directional valve hole 2 have omitted unnecessary connecting flow channels to a great extent, and two flow channel openings are respectively arranged at the inlet / outlet oil port 10 of the hydraulic pump housing, and the two flow channel openings are respectively connected to the directional valve and the overflow valve. Such a design greatly shortens the flow channel length and reduces the pressure loss.

[0029] In the embodiment of the present application, the oil tank housing 5 is one of the components with relatively flexible position arrangement in the EHA housing. Considering the need to reduce the volume and fully utilize the space, it is arranged above the hydraulic pump housing 1, and surrounds the overflow valve socket, part of the directional valve socket 2 and most of the hydraulic cylinder housing 4. However, it should be noted that the lowest point of the oil tank housing 5 should be higher than the connecting oil hole 17 between the oil tank and the directional valve socket 2. Otherwise, the oil in the oil tank below the connecting flow channel between the oil tank and the directional valve socket 2 will be retained in the oil tank due to gravity and cannot participate in the oil circuit circulation. Under certain working conditions, it may even affect the flow rate, output pressure, etc. of the EHA. In addition to fully utilizing the space, the advantages of this design are also reflected in helping the oil tank to dissipate heat and eliminating the connecting pipe between the oil tank and the directional valve socket 2.

[0030] In the embodiments of the present application, Figure 5 It is a cross-sectional view of the hydraulic cylinder housing provided by the present invention. The hydraulic cylinder housing 4 comprises an oil inlet / outlet hole, a hydraulic cylinder mounting head 15, a threaded hole, a cylinder barrel, and an oil groove 18. Different from the hydraulic cylinder housing formed by the traditional processing method, the hydraulic cylinder housing has a part of the flow channel connected with the oil circuit of other components embedded in the cylinder barrel and on the wall of the cylinder barrel. When the hydraulic cylinder piston rod is retracted into the cylinder barrel, the cylinder barrel has an oil groove 18 at the end away from the piston, and a hole connected to the fifth flow channel 14 is opened on the surface of the oil groove 18, and a hole connected to the sixth flow channel 13 is opened at the end close to the piston.

[0031] The present invention applies SLM rapid prototyping technology to the forming and manufacturing of the EHA shell, thereby re-laying out the overall components of the EHA shell, redesigning the shell structure, and re-planning the flow path. The component shells that are scattered under traditional processing are integrated into one, thereby improving space utilization and significantly reducing the weight of the EHA shell. It has great application potential in occasions with high space and weight requirements such as aircraft hydraulic systems and robot power systems.

[0032] It should be noted that the attached Figure 1 An embodiment under an oil circuit principle is given in the specification. If other oil circuit principles are adopted, the design constraints given in the above claims should also be followed.

[0033] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A lightweight electrostatic hydraulic actuator housing formed by SLM, characterized in that: The SLM-formed lightweight electrostatic hydraulic actuator housing is an integral and indivisible whole, comprising: a hydraulic pump housing, a directional valve socket, a first relief valve socket, a second relief valve socket, and a hydraulic cylinder housing; The hydraulic pump oil inlet / outlet on the hydraulic pump housing is connected to the left end of the directional valve socket and the first overflow valve socket through the first flow channel and the second flow channel respectively, the hydraulic pump oil inlet / outlet on the hydraulic pump housing is connected to the right end of the directional valve socket and the second overflow valve socket through the third flow channel and the fourth flow channel respectively, one end of the hydraulic cylinder housing is connected to the first overflow valve socket through the sixth flow channel, and the other end of the hydraulic cylinder housing is connected to the second overflow valve socket through the fifth flow channel; it also includes an oil tank housing, which semi-surrounds most of the hydraulic cylinder housing, part of the hydraulic pump housing, part of the first, second, third, and fourth flow channels, all of the fifth and sixth flow channels, and all of the first and second overflow valve sockets; the hydraulic cylinder housing is located above the hydraulic pump housing and the directional valve socket, and the first and second overflow valve sockets are located on both sides of the hydraulic cylinder housing and above the directional valve socket.

2. The SLM-formed lightweight electrostatic hydraulic actuator housing according to claim 1, characterized in that: The length of the SLM-formed lightweight electrostatic-hydraulic actuator housing is mainly determined by the length of the hydraulic cylinder, that is, the left and right ends of the hydraulic cylinder are ensured to be the leftmost and rightmost ends of the SLM-formed lightweight electrostatic-hydraulic actuator housing. The width of the SLM-formed lightweight electrostatic-hydraulic actuator housing is mainly determined by the width of the hydraulic pump, and the height is mainly determined by the heights of the hydraulic cylinder and the hydraulic pump.

3. The SLM-formed lightweight electrostatic hydraulic actuator housing according to claim 1, characterized in that: A threaded hole connected to the coupling is formed at one end of the hydraulic pump housing, and a crescent-shaped hydraulic pump oil inlet / outlet is formed at the other end.

4. The SLM-formed lightweight electrostatic hydraulic actuator housing according to claim 1, characterized in that: The directional valve socket includes two openings, four threaded holes and three oil holes.

5. The SLM-formed lightweight electrostatic hydraulic actuator housing according to claim 1, characterized in that: The left and right ends of the directional valve socket are respectively provided with openings for installing the directional valve body, the planes where the two openings are located are respectively provided with two threaded holes for assembly and sealing, two first oil holes and second oil holes for oil inlet / outlet are respectively provided near the left and right openings, and a third oil hole for connecting with the oil tank is provided in the middle part.

6. The SLM-formed lightweight electrostatic hydraulic actuator housing 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. The SLM-formed lightweight electrostatic hydraulic actuator housing according to claim 1, characterized in that: An opening for installing the relief valve body is formed at the upper end of the relief valve socket, two threaded holes for assembly are formed on the plane where the opening is located, and an inlet / outlet oil hole is formed on the side located at one side of the directional valve socket.

8. The SLM-formed lightweight electrostatic hydraulic actuator housing according to claim 1, characterized in that: The hydraulic cylinder housing comprises a cylinder barrel and an oil groove. When the hydraulic cylinder piston rod is retracted into the cylinder barrel, an oil groove is opened at one end of the cylinder barrel 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 one end close to the piston.

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