Solenoid valve and operating machinery

Abstract

The present invention provides a solenoid valve and an operating machine, wherein the solenoid valve can compactly incorporate the fluid selection function of a shuttle valve. The solenoid valve (1) comprises: a valve body (11), wherein a valve column hole (21) and a merging chamber (22) are provided in the valve body (11), wherein the valve column hole (21) has a first input port (31), and the merging chamber (22) is connected to the valve column hole (21) and has a second input port (32); a valve column (12) arranged inside the valve column hole (21); a driving part (13) for moving the valve column (12) in the axial direction; and a moving body (14) arranged inside the merging chamber (22) and closing the second input port (32) when the pressure of the fluid from the valve column hole (21) toward the merging chamber (22) is higher than the pressure of the fluid from the second input port (32) toward the merging chamber (22).

Description

Technical Field

[0001] The present invention relates to a solenoid valve having a shuttle valve function for selectively supplying a fluid supplied according to an excitation current and a fluid from another path, and a working machine including the solenoid valve. Background Art

[0002] The shuttle valve is a valve that includes two input ports and one output port, and selectively allows the high-pressure fluid in the fluid flowing into the two input ports to flow out from the output port. For example, Patent Document 1 discloses a hydraulic circuit including a shuttle valve and an electromagnetic proportional valve, in which two oil circuits extending from the two output ports of the electromagnetic proportional valve are connected to the shuttle valve. Thus, the pressure oil with a higher pressure from the two oil circuits is selectively supplied to the pressure oil supply object (main control unit).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 5-39884 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] In the technology of Patent Document 1, the assembly with the shuttle valve built in is arranged radially outside the valve column type electromagnetic proportional valve, and the assembly is integrated with the electromagnetic proportional valve. In the past, such a structure was mostly used, but the size of the structure including the electromagnetic proportional valve and the shuttle valve was enlarged, so there is room for improvement in terms of increasing the degree of freedom of arrangement and operability.

[0008] The present invention has been made in consideration of the above-mentioned actual situation, and its object is to provide a solenoid valve and a working machine which can maintain the basic function of controlling the supply of fluid according to the excitation current and compactly add the fluid selection function of the shuttle valve.

[0009] Solutions for solving problems

[0010] The solenoid valve of the present invention comprises:

[0011] A valve body, in which a valve column hole and a confluence chamber are provided, the valve column hole having a first input port, and the confluence chamber is connected to the valve column hole and has a second input port;

[0012] A valve post, which is arranged inside the valve post hole;

[0013] a driving portion, used to move the valve stem in an axial direction; and

[0014] The moving body is arranged inside the merging chamber and closes the second input port when the pressure of the fluid flowing from the spool hole toward the merging chamber is higher than the pressure of the fluid flowing from the second input port toward the merging chamber.

[0015] The moving body may block the connection between the spool hole and the merging chamber when the pressure of the fluid flowing from the second input port toward the merging chamber is higher than the pressure of the fluid flowing from the spool hole toward the merging chamber.

[0016] Alternatively, the valve column has a hollow hole opening toward the confluence chamber and an inlet hole and an outlet hole opening in the hollow hole, and the valve column can move to a position where the inlet hole is connected to the first input port and blocks the outlet hole and a position where the inlet hole is blocked.

[0017] The second input port may open to the merging chamber along the axial direction and to the outside of the valve body.

[0018] The valve body may include a first valve case portion having the spool hole and a second valve case portion having the confluence chamber, wherein the second valve case portion is attached to the first valve case portion.

[0019] The solenoid valve of the present invention may be configured as an electromagnetic proportional valve.

[0020] In addition, the solenoid valve of the present invention comprises:

[0021] A valve body, in which a valve column hole and a confluence chamber are provided, the valve column hole having a first input port, and the confluence chamber is connected to the valve column hole and has a second input port;

[0022] A valve post, which is arranged inside the valve post hole;

[0023] a driving portion, used to move the valve stem in an axial direction; and

[0024] a moving body disposed inside the merging chamber, and closing the second input port when the pressure of the fluid from the valve column hole toward the merging chamber is higher than the pressure of the fluid from the second input port toward the merging chamber,

[0025] When the pressure of the fluid flowing from the second input port toward the merging chamber is higher than the pressure of the fluid flowing from the valve stem hole toward the merging chamber, the moving body blocks the connection between the valve stem hole and the merging chamber.

[0026] The valve column has a hollow hole opening toward the confluence chamber and an inlet hole and an outlet hole opening in the hollow hole, and the valve column can move to a position where the inlet hole is connected to the first input port and the outlet hole is blocked, and a position where the inlet hole is blocked.

[0027] The second input port opens to the merging chamber along the axial direction and opens to the outside of the valve body.

[0028] The valve body includes: a first valve box having the valve column hole; and a second valve box having the confluence chamber, wherein the second valve box is mounted on the first valve box.

[0029] The solenoid valve is designed as a solenoid proportional valve.

[0030] Furthermore, a working machine according to the present invention includes the solenoid valve.

[0031] Effects of the Invention

[0032] According to the solenoid valve of the present invention, it is possible to compactly add the fluid selection function of the shuttle valve while maintaining the basic function of controlling the supply of the fluid according to the exciting current. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic cross-sectional view of a solenoid valve according to an embodiment of the present invention.

[0034] Description of Reference Numerals

[0035] 1. Solenoid valve; 11. Valve body; 111. First valve box portion; 112. Second valve box portion; 12. Valve column; 13. Drive portion; 14. Moving body; 15. Valve seat member; 15A. Communication hole; 16. Elastic member; 21. Valve column hole; 22. Confluence chamber; 31. First input port; 32. Second input port; 33. Discharge port; 34. Output port; 40. Hollow hole; 41. Inlet hole; 43. Outlet hole; 51. Plunger; C1. Axial direction of the valve column hole. DETAILED DESCRIPTION

[0036] Hereinafter, a solenoid valve 1 according to an embodiment of the present invention will be described with reference to the drawings. Figure 1 The solenoid valve 1 shown is an electromagnetic proportional valve that controls the supply of pressure oil as a fluid and the supply pressure of the pressure oil according to the excitation current. By connecting to a hydraulic device such as a hydraulic actuator, the pressure oil of a desired pressure can be supplied to the hydraulic device. The solenoid valve 1 can also be assembled in a working machine such as a working vehicle. The working vehicle is an excavator, a loader, a bulldozer, a dump truck, etc.

[0037] There are positive type electromagnetic proportional valves and negative type electromagnetic proportional valves. An electromagnetic proportional valve whose pressure of the output fluid increases as the excitation current increases is classified as a positive type electromagnetic proportional valve, and an electromagnetic proportional valve whose pressure of the output fluid decreases as the excitation current increases is classified as a negative type electromagnetic proportional valve. The present invention can be applied to either the positive type electromagnetic proportional valve or the negative type electromagnetic proportional valve, and the electromagnetic valve 1 is configured as a positive type valve column type electromagnetic proportional valve.

[0038] The solenoid valve 1 of the present embodiment includes: a valve body 11 having a valve column hole 21 and a confluence chamber 22; a valve column 12, which is a shaft-shaped member slidably arranged inside the valve column hole 21; a driving part 13, which uses electromagnetic force to move the valve column 12 along the axial direction C1 of the valve column hole 21; and a moving body 14, which is arranged inside the confluence chamber 22. In the valve body 11, the confluence chamber 22 is fluidically connected to the valve column hole 21 from one side of the axial direction C1 (the lower side in the drawing). The valve body 11 has: a first valve box part 111, which is cylindrical and has a valve column hole 21; and a second valve box part 112, which has a confluence chamber 22, and the second valve box part 112 is mounted on the first valve box part 111.

[0039] The end portion of the first valve box portion 111 on one side in the axial direction C1 is cylindrical, and the outer peripheral surface of the end portion is fitted with the embedded cylinder portion 112A provided in the second valve box portion 112, so that the second valve box portion 112 is integrated with the first valve box portion 111. The confluence chamber 22 is open inside the embedded cylinder portion 112A, and is fluidically connected to the valve column hole 21 through the open portion.

[0040] An annular valve seat member 15 is provided in a press-fitted state on the inner peripheral surface of the end portion on one side of the axial direction C1 of the first valve box portion 111, and a connecting hole 15A is provided at the center of the annular valve seat member 15. Specifically, the confluence chamber 22 is connected to the inside of the valve column hole 21 via the connecting hole 15A of the valve seat member 15. Here, the moving body 14 in the confluence chamber 22 is a spherical body, and the moving body 14 can be fitted into the connecting hole 15A, thereby blocking the connection between the valve column hole 21 and the confluence chamber 22.

[0041] An elastic member 16 composed of a coil spring is provided between the surface of the valve seat member 15 facing the side opposite to the merging chamber 22 side and the valve stem 12, and the valve seat member 15 also functions as a spring seat surface. The drive unit 13 is arranged on the side opposite to the merging chamber 22 side relative to the valve stem 12 in the axial direction C1, and can move the valve stem 12 toward the merging chamber 22 side according to the excitation current. When the valve stem 12 moves toward the merging chamber 22 side, the elastic member 16 is compressed, and the force for pushing the valve stem 12 back toward the drive unit 13 side is accumulated in the elastic member 16.

[0042] In addition to the above-mentioned spool hole 21 and confluence chamber 22, the valve body 11 is provided with a first input port 31 and a discharge port 33 opened to the spool hole 21, and a second input port 32 and an output port 34 opened to the confluence chamber 22. In other words, the spool hole 21 has the first input port 31 and the discharge port 33, and the confluence chamber 22 has the second input port 32 and the output port 34. The first input port 31 and the discharge port 33 are provided in the first valve box portion 111, and are respectively opened to the spool hole 21 along the radial direction of the spool hole 21 and are opened to the outside from the outer peripheral surface of the first valve box portion 111. In the present embodiment, the first input port 31 is arranged at a position closer to the confluence chamber 22 than the discharge port 33 in the axial direction C1, but the arrangement may be reversed.

[0043] On the other hand, the second input port 32 and the output port 34 are provided in the second valve box portion 112. The output port 34 opens to the confluence chamber 22 along the radial direction of the valve column hole 21 and opens to the outside from the outer peripheral surface of the second valve box portion 112. The second input port 32 is provided in the wall portion of the second valve box portion 112 on the side opposite to the side facing the valve column hole 21, opens to the confluence chamber 22 along the axial direction C1 and opens to the outside from the outer peripheral surface of the second valve box portion 112.

[0044] The first input port 31 is connected to a hydraulic source P for supplying pressure oil, and the discharge port 33 is connected to a drain T for discharging pressure oil. In addition, the output port 34 is connected to, for example, a hydraulic device A1 as a supply target of pressure oil, and the second input port 32 is connected to, for example, a hydraulic source different from the hydraulic source P or an oil circuit for pressurizing and delivering pressure oil.

[0045] The valve column 12 is provided with a hollow hole 40 extending along the axial direction C1 and having an end portion on one side of the axial direction C1 open toward the confluence chamber 22 side, and an inlet hole 41 and an outlet hole 43 open to the hollow hole 40. The inlet hole 41 and the outlet hole 43 are respectively opened to the hollow hole 40 along the radial direction of the valve column hole 21 and open to the outside from the outer peripheral surface of the valve column 12.

[0046] The inlet hole 41 is connected to the first input port 31, or is opposite to the inner peripheral surface of the valve body 11, or is connected to the first input port 31 and is opposite to the inner peripheral surface of the valve body 11, depending on the movement position of the spool 12 in the axial direction C1. When the inlet hole 41 is connected to the first input port 31, the pressure oil flowing into the first input port 31 can flow into the merging chamber 22 via the inlet hole 41, the hollow hole 40, the spool hole 21, and the connecting hole 15A. On the other hand, the outlet hole 43 is connected to the discharge port 33, or is opposite to the inner peripheral surface of the valve body 11, or is connected to the discharge port 33 and is opposite to the inner peripheral surface of the valve body 11, depending on the movement position of the spool 12 in the axial direction C1. When the outlet hole 43 is connected to the discharge port 33, the pressure oil in the spool hole 21 and the hollow hole 40 can flow out to the drain portion T.

[0047] In the present embodiment, when the inlet hole 41 is connected to the first input port 31, the outlet hole 43 is opposite to the inner peripheral surface of the valve body 11, and when the outlet hole 43 is connected to the discharge port 33, the inlet hole 41 is opposite to the inner peripheral surface of the valve body 11. Therefore, the valve spool 12 can switch between the state where the inlet hole 41 is connected to the first input port 31 and the connection between the outlet hole 43 and the discharge port 33 is blocked, and the state where the outlet hole 43 is connected to the discharge port 33 and the connection between the inlet hole 41 and the first input port 31 is blocked, depending on the position (movement position) of the valve spool 12 moved in the axial direction C1 by the drive unit 13.

[0048] Figure 1 This shows a non-excitation state in which no excitation current flows in the drive unit 13 formed of the solenoid actuator, and the valve stem 12 is not moved toward the merging chamber 22 by the drive unit 13. At this time, the outlet hole 43 of the valve stem 12 is connected to the discharge port 33 and the inlet hole 41 is blocked. From this state, the valve stem 12 moves toward the merging chamber 22, and the inlet hole 41 is connected to the first input port 31 and the outlet hole 43 is blocked.

[0049] The driving unit 13 pushes the valve column 12 toward one side of the axial direction C1, that is, toward the confluence chamber 22, and the pushing force applied to the valve column 12 can be changed in accordance with the applied current (that is, the excitation current). The driving unit 13 of this embodiment is composed of a solenoid actuator that combines an electromagnet (not shown) and a plunger 51. However, the specific structure of the solenoid actuator is not limited, and the driving unit 13 can be composed of any solenoid actuator that determines the pushing force applied from the plunger 51 to the valve column 12 according to the magnitude of the excitation current.

[0050] In addition, as described above, a hydraulic source different from the hydraulic source P, for example, or an oil path for pressurizing and delivering pressure oil is connected to the second input port 32. In this case, the pressure oil flowing into the first input port 31 flows into the merging chamber 22, and the pressure oil flowing into the second input port 32 flows into the merging chamber 22 at the same time. However, in this case, in the present embodiment, the merging chamber 22 and the moving body 14 function as a shuttle valve.

[0051] That is, when the pressure (hydraulic pressure) of the pressure oil flowing from the first input port 31 to the merging chamber 22 via the hollow hole 40 and the valve column hole 21 when the inlet hole 41 is connected to the first input port 31 is higher than the pressure of the pressure oil flowing from the second input port 32 to the merging chamber 22, the moving body 14 closes the second input port 32. On the other hand, when the pressure of the pressure oil flowing from the second input port 32 to the merging chamber 22 is higher than the pressure of the pressure oil flowing from the first input port 31 to the merging chamber 22 via the hollow hole 40 and the valve column hole 21 when the inlet hole 41 is connected to the first input port 31, the moving body 14 is seated on the valve seat member 15, and the connection between the valve column hole 21 and the merging chamber 22 is blocked.

[0052] Next, the operation of the solenoid valve 1 will be described.

[0053] When no current is applied to the driving unit 13 or when the first current is applied to the driving unit 13, the valve stem 12 is arranged at Figure 1 In this case, the spool hole 21 is connected to the discharge port 33 via the outlet hole 43 , the inlet hole 41 is not connected to the first input port 31 , and the pressure oil from the first input port 31 does not flow into the spool hole 21 .

[0054] If a second current greater than the first current is applied to the driving unit 13 from the above state, the valve column 12 is pushed toward the merging chamber 22 side by the plunger 51 of the driving unit 13 in the axial direction C1, the inlet hole 41 is connected to the first input port 31, and the pressure oil from the first input port 31 flows into the valve column hole 21.

[0055] Here, when the pressure oil toward the merging chamber 22 is also supplied to the second input port 32, in the case where the pressure of the pressure oil toward the merging chamber 22 from the first input port 31 via the hollow hole 40 and the spool hole 21 is higher than the pressure of the pressure oil toward the merging chamber 22 from the second input port 32, the moving body 14 closes the second input port 32. On the other hand, in the case where the pressure of the pressure oil toward the merging chamber 22 from the second input port 32 is higher than the pressure of the pressure oil toward the merging chamber 22 from the first input port 31 via the hollow hole 40 and the spool hole 21, the moving body 14 is seated on the valve seat member 15, and the connection between the spool hole 21 and the merging chamber 22 is blocked. As a result, the higher pressure oil from the first input port 31 and the pressure oil from the second input port 32 is output from the output port 34.

[0056] In the present embodiment described above, the supply and blocking of the pressure oil from the first input port 31 can be switched by controlling the position of the spool 12 according to the excitation current, and when the pressure oil from the first input port 31 is supplied to the merging chamber 22 and the pressure oil is also supplied to the merging chamber 22 from the second input port 32, the merging chamber 22 and the moving body 14 therein function as a shuttle valve. Thus, the pressure oil from the first input port 31 and the pressure oil from the second input port 32, whichever has a higher pressure, can be selectively output from the output port 34.

[0057] Here, the merging chamber 22 and the moving body 14 therein that function as the shuttle valve are arranged in the valve body 11 in the axial direction C1 along with the valve body 11 and the valve stem 12, thereby suppressing radial projection of the merging chamber 22 and the moving body 14 therein. Thus, according to this embodiment, the basic function of controlling the supply of the fluid according to the excitation current can be maintained and the fluid selection function of the shuttle valve can be compactly added.

[0058] In addition, the second input port 32 opens to the merging chamber 22 along the axial direction C1 and opens to the outside of the valve body 11, specifically, opens to the outside of the second valve box portion 112. In this case, the pressure oil from the second input port 32 toward the merging chamber 22 can flow into the merging chamber 22 through a simple straight oil path, and the pressure oil can be opposed to the pressure oil from the first input port 31 via the moving body 14. Thus, the function of the shuttle valve can be realized without complicating the path of the pressure oil (fluid).

[0059] In addition, the valve body 11 includes a first valve box portion 111 having a valve column hole 21 and a second valve box portion 112 having a confluence chamber 22, and the second valve box portion 112 is mounted on the first valve box portion 111. As a result, the output port 34 and the second input port 32 of the second valve box portion 112 are easily formed, so that the manufacturing efficiency of the solenoid valve 1 can be improved.

[0060] As mentioned above, although embodiment of this invention is described, this invention is not limited to the said embodiment, Various changes are possible in the said embodiment.

[0061] For example, the valve body 11 of the above embodiment has: a first valve box portion 111, which is provided with a first input port 31 and a discharge port 33; and a second valve box portion 112, which is provided with a second input port 32 and an output port 34. The first valve box portion 111 and the second valve box portion 112 are components independent of each other, but the valve body 11 may also have a structure in which the first input port 31, the discharge port 33, the second input port 32 and the output port 34 are provided in one component.

Claims

1. A solenoid valve, comprising: A valve body, in which a valve column hole and a confluence chamber are provided, the valve column hole having a first input port, the confluence chamber connected to the valve column hole having a second input port and an output port; A valve post, which is arranged inside the valve post hole; a driving unit for moving the valve stem in the axial direction to switch between supplying fluid from the first input port to the valve stem hole and blocking the fluid from the first input port to the valve stem hole; as well as a moving body disposed inside the merging chamber, and closing the second input port when the pressure of the fluid supplied from the first input port to the valve column hole and flowing from the valve column hole toward the merging chamber is higher than the pressure of the fluid flowing from the second input port toward the merging chamber; The merging chamber and the moving body are arranged in the valve body in the axial direction with the valve stem. When the pressure of the fluid flowing from the second input port toward the merging chamber is higher than the pressure of the fluid flowing from the spool hole toward the merging chamber, the moving body blocks the connection between the spool hole and the merging chamber.

2. The solenoid valve according to claim 1, wherein: The valve column has a hollow hole opening toward the confluence chamber and an inlet hole and an outlet hole opening in the hollow hole. The valve column can move to a position where the inlet hole is connected to the first input port and the outlet hole is blocked, and a position where the inlet hole is blocked.

3. The solenoid valve according to claim 1 or 2, wherein: The second input port opens to the merging chamber along the axial direction and opens to the outside of the valve body.

4. The solenoid valve according to claim 1, wherein: The valve body includes a first valve box portion having the spool hole and a second valve box portion having the confluence chamber, wherein the second valve box portion is attached to the first valve box portion.

5. The solenoid valve according to claim 1, wherein: The solenoid valve is designed as a solenoid proportional valve.

6. A solenoid valve, comprising: A valve body, in which a valve column hole and a confluence chamber are provided, the valve column hole having a first input port, the confluence chamber connected to the valve column hole having a second input port and an output port; A valve post, which is arranged inside the valve post hole; a driving unit for moving the valve stem in the axial direction to switch between supplying fluid from the first input port to the valve stem hole and blocking the fluid from the first input port to the valve stem hole; as well as a moving body disposed inside the merging chamber, and closing the second input port when the pressure of the fluid supplied from the first input port to the valve column hole and flowing from the valve column hole toward the merging chamber is higher than the pressure of the fluid flowing from the second input port toward the merging chamber; The merging chamber and the moving body are arranged in the valve body in the axial direction with the valve stem. When the pressure of the fluid flowing from the second input port toward the merging chamber is higher than the pressure of the fluid flowing from the valve stem hole toward the merging chamber, the moving body blocks the connection between the valve stem hole and the merging chamber. The valve column has a hollow hole opening toward the confluence chamber and an inlet hole and an outlet hole opening in the hollow hole, and the valve column can move to a position where the inlet hole is connected to the first input port and the outlet hole is blocked, and a position where the inlet hole is blocked. The second input port opens to the merging chamber along the axial direction and opens to the outside of the valve body. The valve body includes: a first valve box having the valve column hole; and a second valve box having the confluence chamber, wherein the second valve box is mounted on the first valve box. The solenoid valve is designed as a solenoid proportional valve.

7. A working machine, wherein: The working machine includes the solenoid valve according to claim 1.

8. A working machine, wherein: The working machine includes the solenoid valve according to claim 6.

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