Hydraulic valve and steering engine

Abstract

The utility model discloses a hydraulic valve and a steering engine, the hydraulic valve comprises a valve group, and the valve group comprises a valve seat and a valve core; the key point of the utility model is that the valve seat is provided with a first oil port, a second oil port and two working oil ports; the valve seat is further provided with an oil return channel and a flow guide channel communicating with the first oil opening and the oil return channel. The valve element is rotationally matched in the valve seat, one end of the valve element is connected with an output shaft of the steering engine, a first oil groove, a second oil groove and an oil return groove are formed in the peripheral wall of the valve element, the first oil groove communicates with the first oil port, and the second oil groove and the oil return groove communicate with the second oil port; when the oil return groove is communicated with the oil return channel, the oil return groove, the oil return channel and the flow guide channel form a neutral-position loop, so that the first oil port and the second oil port are communicated to the oil tank through the neutral-position loop, namely hydraulic oil can directly return to the oil tank through the neutral-position loop, a variable pump or an unloading valve does not need to be installed, and therefore the use amount of elements is reduced; the size and the power consumption can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valves, in particular to a hydraulic valve and a steering gear. Background Art

[0002] Hydraulic valves can be applied to robots. Existing hydraulic valves include valve seats and valve cores. The valve seats are provided with multiple receiving holes. An outer wall of the valve seat is provided with an oil inlet and an oil outlet. Another outer wall of the valve seat is provided with two working oil ports. A valve core rotates and fits in a receiving hole and is connected to the robot's steering gear. The valve core rotates under the drive of the steering gear, so that the oil inlet is connected to a working oil port through the valve core, and the oil outlet is connected to another working oil port through the valve core, that is, the steering gear controls the oil circuit of the hydraulic valve by rotating the valve core. However, the above-mentioned hydraulic valve needs to be installed with a variable pump or a unloading valve element, resulting in a large volume. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a hydraulic valve and a steering gear, wherein an oil return passage and a flow guide passage are arranged on the valve seat of the hydraulic valve, and an oil return groove is arranged on the outer peripheral wall of the valve core. When the oil return groove is connected with the oil return passage, the oil return groove, the oil return passage and the flow guide passage form a mid-position loop, so that the first oil port and the second oil port are connected to the oil tank through the mid-position loop, and there is no need to install a variable pump or a unloading valve, thereby reducing the use of components, which not only reduces the volume but also reduces power consumption.

[0004] To achieve the above purpose, the embodiment of the utility model adopts the following technical solutions:

[0005] A hydraulic valve connected to the steering gear comprises a valve group, wherein the valve group comprises a valve seat and a valve core;

[0006] The valve seat has an accommodating hole formed inside, and an outer wall of the valve seat is provided with a first oil port, a second oil port and two working oil ports connected to the accommodating hole and arranged in a staggered manner; the valve seat is also provided with an oil return passage connected to the accommodating hole, and a flow guide passage connected to the first oil port and the oil return passage, and the oil return passage and the flow guide passage are located outside the accommodating hole;

[0007] The valve core is rotatably fitted in the accommodating hole and one end of the valve core is connected to the output shaft of the steering gear. The outer peripheral wall of the valve core is provided with a first oil groove, a second oil groove and an oil return groove arranged in a circumferentially staggered manner. The first oil groove is communicated with the first oil port, and the second oil groove and the oil return groove are communicated with the second oil port.

[0008] The valve core rotates under the drive of the output shaft, so that the first oil groove is connected or disconnected with one of the working oil ports, the second oil groove is connected or disconnected with another of the working oil ports, and the return oil groove is connected or disconnected with the return oil passage.

[0009] Furthermore, the valve seat has a first outer side wall and a second outer side wall relative to each other, the first outer side wall is provided with the first oil port and the second oil port, the valve seat includes a side plate fixed on the second outer side wall, and the inner plate surface of the side plate close to the second outer side wall is provided with the flow guide channel.

[0010] Furthermore, the inner plate surface is recessed to form a guide groove, a first end of the guide groove corresponds to the first oil port and the two are connected, a second end of the guide groove extends toward the oil return channel and is connected to the oil return channel, and the guide groove and the second outer side wall form the guide channel.

[0011] Furthermore, the second end extends obliquely toward the oil return passage, and a sealing gasket is provided in the guide groove, and the sealing gasket is tightly fitted to the inner wall of the guide groove away from the inner plate surface and the second outer side wall.

[0012] Furthermore, the first outer side wall of the valve seat is provided with the first oil port and the second oil port, the third outer side wall of the valve seat is provided with the two working oil ports, and the third outer side wall is adjacent to the first outer side wall; viewed in a direction perpendicular to the first outer side wall, the second oil port is located below the first oil port and the projection centers of the two are located on a first straight line, the projection center of the return oil channel is located outside the first straight line, and the upper end projection and the lower end projection of the guide channel coincide with the projection of the first oil port and the projection of the return oil channel, respectively.

[0013] Further, the oil return passage is located between the first oil port and the second oil port, the guide passage is located between the first oil port and the oil return passage, and the outer peripheral walls at both ends of the valve core are respectively recessed inward to form a first annular groove and a second groove corresponding to the first oil port and the second oil port, the first groove is connected to the first oil port and the first oil groove, and the second groove is connected to the second oil port and the second oil groove.

[0014] Furthermore, the first oil groove and the second oil groove respectively extend along the axial direction of the valve core and there are two of them, the two first oil grooves are located on one side of the valve core axis, the two second oil grooves are located on the other side of the valve core axis, and the two first oil grooves and the two second oil grooves are distributed in a circular array with the valve core axis as the center; the oil return groove is located between the two first oil grooves.

[0015] Furthermore, there are multiple valve groups, and the multiple valve groups are connected in series to form a multi-valve. Correspondingly, there are multiple steering gears, and one steering gear is connected to one group of valve groups.

[0016] Furthermore, multiple groups of first oil ports of the valve groups are connected to form a first oil circuit connected to the flow guide channel, and multiple groups of return oil channels of the valve groups are connected to form a second oil circuit, which is connected to the flow guide channel and to the second oil port through the return oil groove.

[0017] The hydraulic valve of the utility model is provided with an oil return passage connected with the accommodating hole and a guide passage connected with the first oil port and the oil return passage on the valve seat. An oil return groove is opened inwardly on the outer peripheral wall of the valve core. The valve core rotates under the drive of the output shaft, so that the oil return groove is connected or disconnected with the oil return passage. When the oil return groove is connected with the oil return passage, the oil return groove, the oil return passage and the guide passage form a neutral loop, so that the first oil port and the second oil port are connected to the oil tank through the neutral loop, that is, the hydraulic oil can directly return to the oil tank through the neutral loop. At this time, the oil source pressure approaches 0, and there is no need to install a variable pump or an unloading valve, thereby reducing the use of components. On the one hand, it can reduce the volume and simplify the structure. On the other hand, it can reduce power consumption, achieve standby energy saving, and further reduce costs.

[0018] An embodiment of the utility model further provides a steering gear, comprising the hydraulic valve described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of a hydraulic valve according to an embodiment of the utility model;

[0020] Figure 2 for Figure 1 The main view;

[0021] Figure 3 for Figure 2 AA direction cross-sectional view;

[0022] Figure 4 for Figure 2 Cross-sectional view in BB direction when in working state;

[0023] Figure 5 for Figure 4 Schematic diagram of the standby state diagram;

[0024] Figure 6 for Figure 2 CC direction cross-sectional view when in standby state;

[0025] Figure 7 for Figure 1 A three-dimensional schematic diagram of the valve core from another perspective;

[0026] Figure 8 for Figure 6 A schematic diagram of another embodiment of the present invention;

[0027] Fig. 9 for Figure 8 A three-dimensional schematic diagram of . DETAILED DESCRIPTION

[0028] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0029] like Figures 1 to 9 As shown, the embodiment of the utility model provides a hydraulic valve connected to a steering gear 200, the hydraulic valve comprises a valve group 100, the valve group 100 comprises a valve seat 1 and a valve core 2, the valve core 2 is installed in the valve seat 1 (such as Figure 1 , Figure 3 as shown).

[0030] like Figure 1 , Figure 3 and Figure 4 As shown, a receiving hole 11 is provided inside the valve seat 1, and a first oil port 11, a second oil port 12 and two working oil ports 13 are provided on the outer side wall of the valve seat 1, which are connected to the receiving hole 11 and are arranged in a staggered manner. Specifically, the valve seat 1 has a first outer side wall 16 and a second outer side wall 17 opposite to each other, and a third outer side wall 18 located between the first outer side wall 16 and the second outer side wall 17, that is, the third outer side wall 18 is adjacent to the first outer side wall 16; the first outer side wall 16 is provided with a first oil port 11 and a second oil port 12 for connecting to an oil tank (not shown), and the second oil port 12 is located below the first oil port 11. When the third outer side wall 18 is located between the first outer side wall 16 and the second outer side wall 17, the third outer side wall 18 is adjacent to the first outer side wall 16. When one oil port 11 is used as an oil inlet, the second oil port 12 is used as an oil outlet. Alternatively, when the second oil port 12 is used as an oil inlet, the first oil port 11 is used as an oil outlet. The specific selection can be made according to needs. The third outer wall 18 is provided with two working oil ports 13 for connecting to actuators (not shown). The two working oil ports 13 are arranged side by side. The one of the two working oil ports 13 close to the first outer wall 16 is the first working oil port, and the other of the two working oil ports 13 is the second working oil port. When one of the working oil ports 13 is used as an output port, the other working oil port 13 is used as an oil return port. The specific selection can be made according to the situation.

[0031] like Figure 2 , Figure 6 As shown, the valve seat 1 is further provided with an oil return passage 14 located between the first oil port 11 and the second oil port 12 and connected to the accommodating hole 11, and a flow guide passage 15 located between the first oil port 11 and the oil return passage 14 and connected to the two. The oil return passage 14 and the flow guide passage 15 are located outside the accommodating hole 11; viewed in a direction perpendicular to the first outer side wall 16, the projection centers of the first oil port 11 and the second oil port 12 are located on the first straight line L, and the projection center of the oil return passage 14 is located outside the first straight line L to reasonably utilize the space of the valve seat 1, and the upper end projection and the lower end projection of the flow guide passage 15 coincide with the projection of the first oil port 11 and the projection of the oil return passage 14, respectively.

[0032] like Figures 3 to 5As shown, the valve core 2 is rotatably fitted in the accommodating hole 11 and one end of the valve core 2 is connected to the output shaft 201 of the servo 200. The outer peripheral wall of the valve core 2 is provided with a first oil groove 21, a second oil groove 22 and an oil return groove 23 which are staggered along its circumference. The first oil groove 21 is connected to the first oil port 11, the second oil groove 22 is connected to the second oil port 12, and the oil return groove 23 is connected to the second oil port 12. Specifically, the first oil groove 21 and the second oil groove 22 extend axially along the valve core 2 and there are two of them. The two first oil grooves 21 are located on one side of the axis of the valve core 2, and the two second oil grooves 22 are located on the other side of the axis of the valve core 2. The two first oil grooves 21 and the two second oil grooves 22 are distributed in a circular array with the axis of the valve core 2 as the center; the oil return groove 23 is located between the two first oil grooves 21. As shown Figure 3 , Figure 7 As shown, in the present embodiment, the outer peripheral walls at both ends of the valve core 2 are respectively recessed inwardly corresponding to the first oil port 11 and the second oil port 12 to form a first groove 24 and a second groove 25 in the shape of an annular ring. The first groove 24 is connected with the first oil port 11 and the first oil groove 21, and the second groove 25 is connected with the second oil port 12 and the second oil groove 22. An upper sealing ring 4 and a lower sealing ring 5 are respectively provided at the upper and lower ends of the valve core 2. The upper sealing ring 4 is located above the first groove 24, and the lower sealing ring 5 is located below the second groove 25. The upper sealing ring 4 and the lower sealing ring 5 are both tightly fitted with the outer peripheral wall of the valve core 2 and the inner side wall of the accommodating hole 11 to form a sealing structure to achieve good sealing.

[0033] like Figures 4 to 6 As shown, the valve core 2 rotates driven by the output shaft 201, so that the first oil groove 21 is connected or disconnected with a working oil port 13, the second oil groove 22 is connected or disconnected with another working oil port 13, and the return oil groove 23 is connected or disconnected with the return oil channel 14, that is, the steering gear 200 controls the oil circuit of the hydraulic valve through the valve core 2. Specifically, when the hydraulic valve is in a working state, the valve core 2 rotates under the drive of the output shaft 201, so that the first oil groove 21 is connected to a working oil port 13, the second oil groove 22 is connected to another working oil port 13, and the return oil groove 23 is disconnected from the return oil passage 14; when the hydraulic valve is in a standby state, the valve core 2 rotates under the drive of the output shaft 201, so that the first oil groove 21 is disconnected from a working oil port 13, the second oil groove 22 is disconnected from another working oil port 13, and the return oil groove 23 is connected to the return oil passage 14. At this time, the return oil groove, the return oil passage 14 and the guide passage 15 form a neutral loop, so that the first oil port 11 and the second oil port 12 are connected to the oil tank through the neutral loop, that is, the hydraulic oil can directly return to the oil tank through the neutral loop. At this time, the oil source pressure approaches 0, and there is no need to install a variable pump or a unloading valve, thereby reducing the use of components. On the one hand, it can reduce the volume and simplify the structure, and on the other hand, it can reduce power consumption, achieve standby energy saving, and further reduce costs.

[0034] like Figures 1 to 3As shown, in order to facilitate processing, disassembly and replacement, the valve seat 1 is provided with a side plate 10, and the specific structure is as follows: the valve seat 1 includes a side plate 10 fixed on the second outer side wall 17, and the inner plate surface 101 of the side plate 10 close to the second outer side wall 17 is provided with a guide channel 15. More specifically, the inner plate surface 101 is recessed to form a guide groove 102, and the first end 1021 of the guide groove 102 corresponds to the first oil port 11 and the two are connected, and the second end 1022 of the guide groove 102 extends toward the return oil channel 14 and It is connected to the oil return channel 14, and the guide groove 102 and the second outer side wall 17 form a guide channel 15. Of course, in other embodiments, the guide groove 102 can also be opened on the second outer side wall 17, and the specific selection can be made according to actual needs; in this embodiment, the second end 1022 extends obliquely toward the oil return channel 14, and a sealing gasket 19 is also provided in the guide groove 102. The sealing gasket 19 is tightly fitted with the inner wall of the guide groove 102 away from the inner plate surface 101 and the second outer side wall 17 to form a good seal.

[0035] like Figure 8 , Fig. 9 As shown, in another embodiment, there are multiple valve groups 100 (i.e., single valves), and the multiple valve groups 100 are connected in series to form a multi-valve 300, that is, the hydraulic valve is a multi-valve 300. Correspondingly, there are multiple steering gears 200, and one steering gear 200 is connected to one group of valve groups 100. This multi-valve 300 can be connected to the steering gear 200 of a small low-pressure device, wherein the small low-pressure device can be an RC remote control device or a robot, etc. Specifically, there are three groups of valve groups 100, and a positioning groove 6 is provided between the joint surfaces of two adjacent valve seats 1, and a sealing ring 7 for sealing is provided in the positioning groove 6. Correspondingly, there are three servos 200; more specifically, the first oil ports 11 of multiple valve groups 100 are connected to form a first oil circuit connected to the flow guide 15, and the return oil channels 14 of multiple valve groups 100 are connected to form a second oil circuit 3, and the second oil circuit 3 is connected to the flow guide 15 and is connected to the second oil port 12 through the return oil groove 23, so as to achieve the purpose of controlling multiple oil circuits respectively using the same oil source. When three valve groups 100 are connected in series, the side plate 10 is removed from the first joint, the first oil port 11, the second oil port 12 and the side plate 10 are removed from the middle joint, and the first joint, the middle joint and the tail joint are connected by bolts to form a multi-joint valve 300, which can be seen to be convenient to assemble and flexible to use.

[0036] like Figures 4 to 6As shown in FIG. 1 , when the hydraulic valve is in working state, the valve core 2 rotates 45° counterclockwise under the drive of the output shaft 201, so that the first oil groove 21 is connected with the second working oil port, that is, the second working oil port is connected with the first oil port 11 through the first oil groove 21, and the second oil groove 22 is connected with the first working oil port, that is, the first working oil port is connected with the second oil port 12 through the second oil groove 22. At this time, the oil return groove 23 is disconnected from the oil return passage 14. When the valve core 2 rotates 45° clockwise under the drive of the output shaft 201, the first oil groove 21 is connected with the first working oil port. The working oil ports are connected, that is, the first working oil port is connected with the first oil port 11 through the first oil groove 21, and the second oil groove 22 is connected with the second working oil port, that is, the second working oil port is connected with the second oil port 12 through the second oil groove 22. At this time, the return oil groove 23 is disconnected from the return oil channel 14; when the hydraulic valve is in the standby state, the valve core 2 rotates under the drive of the output shaft 201, so that the first working oil port of the first oil groove 21 is disconnected, and the second oil groove 22 is disconnected from the second working oil port. At this time, the return oil groove 23 is connected with the return oil channel 14 to form a mid-position loop.

[0037] The hydraulic valve of the utility model is provided with an oil return passage connected with the accommodating hole and a guide passage connected with the first oil port and the oil return passage on the valve seat. An oil return groove is opened inwardly on the outer peripheral wall of the valve core. The valve core rotates under the drive of the output shaft, so that the oil return groove is connected or disconnected with the oil return passage. When the oil return groove is connected with the oil return passage, the oil return groove, the oil return passage and the guide passage form a neutral loop, so that the first oil port and the second oil port are connected to the oil tank through the neutral loop, that is, the hydraulic oil can directly return to the oil tank through the neutral loop. At this time, the oil source pressure approaches 0, and there is no need to install a variable pump or an unloading valve, thereby reducing the use of components. On the one hand, it can reduce the volume and simplify the structure. On the other hand, it can reduce power consumption, achieve standby energy saving, and further reduce costs.

[0038] The utility model further provides a steering gear 200, which is installed on an RC remote control device or a robot and includes the hydraulic valve described in any of the above embodiments.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulic valve connected to the steering gear, characterized in that: It comprises a valve group, wherein the valve group comprises a valve seat and a valve core; The valve seat has an accommodating hole formed inside, and an outer wall of the valve seat is provided with a first oil port, a second oil port and two working oil ports connected to the accommodating hole and arranged in a staggered manner; the valve seat is also provided with an oil return passage connected to the accommodating hole, and a flow guide passage connected to the first oil port and the oil return passage, and the oil return passage and the flow guide passage are located outside the accommodating hole; The valve core is rotatably fitted in the accommodating hole and one end of the valve core is connected to the output shaft of the steering gear. The outer peripheral wall of the valve core is provided with a first oil groove, a second oil groove and an oil return groove arranged in a circumferentially staggered manner. The first oil groove is communicated with the first oil port, and the second oil groove and the oil return groove are communicated with the second oil port. The valve core rotates under the drive of the output shaft, so that the first oil groove is connected or disconnected with one of the working oil ports, the second oil groove is connected or disconnected with another of the working oil ports, and the return oil groove is connected or disconnected with the return oil passage.

2. The hydraulic valve according to claim 1, characterized in that The valve seat has a first outer side wall and a second outer side wall opposite to each other, the first outer side wall is provided with the first oil port and the second oil port, the valve seat includes a side plate fixed on the second outer side wall, and the inner plate surface of the side plate close to the second outer side wall is provided with the flow guide channel.

3. The hydraulic valve according to claim 2, characterized in that The inner plate surface is recessed to form a guide groove, the first end of the guide groove corresponds to the first oil port and the two are connected, the second end of the guide groove extends toward the oil return channel and is connected to the oil return channel, and the guide groove and the second outer side wall form the guide channel.

4. The hydraulic valve according to claim 3, characterized in that The second end extends obliquely toward the oil return passage, and a sealing gasket is provided in the guide groove. The sealing gasket is tightly fitted to the inner wall of the guide groove away from the inner plate surface and the second outer side wall.

5. The hydraulic valve according to claim 1, characterized in that: The first outer side wall of the valve seat is provided with the first oil port and the second oil port, the third outer side wall of the valve seat is provided with the two working oil ports, and the third outer side wall is adjacent to the first outer side wall; viewed in a direction perpendicular to the first outer side wall, the second oil port is located below the first oil port and the projection centers of the two are located on a first straight line, the projection center of the return oil passage is located outside the first straight line, and the upper end projection and the lower end projection of the guide passage coincide with the projection of the first oil port and the projection of the return oil passage respectively.

6. The hydraulic valve according to claim 1, characterized in that The oil return passage is located between the first oil port and the second oil port, the flow guide passage is located between the first oil port and the oil return passage, and the outer peripheral walls at both ends of the valve core are respectively recessed inward to form a first annular groove and a second annular groove corresponding to the first oil port and the second oil port, the first groove is connected to the first oil port and the first oil groove, and the second groove is connected to the second oil port and the second oil groove.

7. The hydraulic valve according to claim 1, characterized in that The first oil groove and the second oil groove respectively extend along the axial direction of the valve core and there are two of them, the two first oil grooves are located on one side of the valve core axis, the two second oil grooves are located on the other side of the valve core axis, and the two first oil grooves and the two second oil grooves are distributed in a circular array with the valve core axis as the center; the oil return groove is located between the two first oil grooves.

8. The hydraulic valve according to claim 1, characterized in that There are multiple valve groups, and the multiple valve groups are connected in series to form a multi-valve. Correspondingly, there are multiple steering gears, and one steering gear is connected to one group of valve groups.

9. The hydraulic valve according to claim 8, characterized in that The first oil ports of the plurality of valve groups are connected to form a first oil circuit connected to the flow guide channel, and the return oil channels of the plurality of valve groups are connected to form a second oil circuit, which is connected to the flow guide channel and to the second oil port through the return oil groove.

10. A steering gear, characterized in that: Comprising a hydraulic valve as claimed in any one of claims 1 to 9.

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