阅读说明：本技术 电磁阀和作业机械 (Solenoid valve and work machine ) 是由 岩崎仁 于 2020-01-14 设计创作，主要内容包括：本发明提供电磁阀和作业机械,该电磁阀能够紧凑地加入梭形滑阀所具有的流体选择功能。电磁阀(1)包括：阀主体(11),在该阀主体(11)设有阀柱孔(21)和合流室(22),该阀柱孔(21)具有第1输入端口(31),该合流室(22)与阀柱孔(21)连接,具有第2输入端口(32)；阀柱(12),其配置于阀柱孔(21)的内部；驱动部(13),其用于使阀柱(12)沿轴向移动；以及移动体(14),其配置于合流室(22)的内部,在自阀柱孔(21)朝向合流室(22)的流体的压力高于自第2输入端口(32)朝向合流室(22)的流体的压力的情况下,关闭第2输入端口(32)。(The invention provides a solenoid valve and a working machine, wherein the solenoid valve can be compactly added with the fluid selection function of a shuttle valve. The solenoid valve (1) comprises: a valve main body (11) provided with a spool hole (21) and a merging chamber (22) in the valve main body (11), the spool hole (21) having a1 st input port (31), the merging chamber (22) being connected to the spool hole (21) and having a 2 nd input port (32); a spool (12) disposed inside the spool hole (21); a drive unit (13) for moving the spool (12) in the axial direction; and a moving body (14) which is disposed inside the confluence chamber (22) and closes the 2 nd input port (32) when the pressure of the fluid flowing from the spool hole (21) to the confluence chamber (22) is higher than the pressure of the fluid flowing from the 2 nd input port (32) to the confluence chamber (22).)

1. A solenoid valve, comprising:

a valve main body provided with a spool hole having a1 st input port and a confluence chamber connected to the spool hole and having a 2 nd input port;

a spool disposed inside the spool hole;

a drive section for moving the spool in an axial direction; and

and a moving member that is disposed inside the merging chamber and closes the 2 nd input port when a pressure of the fluid flowing from the spool hole to the merging chamber is higher than a pressure of the fluid flowing from the 2 nd input port to the merging chamber.

2. The electromagnetic valve according to claim 1,

the moving body blocks the connection between the spool hole and the confluence chamber in a case where a pressure of the fluid from the 2 nd input port toward the confluence chamber is higher than a pressure of the fluid from the spool hole toward the confluence chamber.

3. The electromagnetic valve according to claim 2,

the spool has a hollow hole opened toward the confluence chamber, and an inlet hole and an outlet hole opened to the hollow hole, and is movable to a position where the inlet hole is connected to the 1 st input port and blocks the outlet hole and a position where the inlet hole is blocked.

4. The electromagnetic valve according to any one of claims 1 to 3,

the 2 nd input port opens to the confluence chamber along the axial direction and opens to the outside of the valve body.

5. The electromagnetic valve according to claim 1,

the valve body has: a1 st valve housing portion having the valve post hole; and a 2 nd valve box part having the merging chamber, the 2 nd valve box part being attached to the 1 st valve box part.

6. The electromagnetic valve according to claim 1,

the solenoid valve is configured as an electromagnetic proportional valve.

7. A solenoid valve, comprising:

a valve main body provided with a spool hole having a1 st input port and a confluence chamber connected to the spool hole and having a 2 nd input port;

a spool disposed inside the spool hole;

a drive section for moving the spool in an axial direction; and

a moving body that is disposed inside the merging chamber and closes the 2 nd input port when a pressure of the fluid flowing from the spool hole toward the merging chamber is higher than a pressure of the fluid flowing from the 2 nd input port toward the merging chamber,

the moving body blocks a connection between the spool hole and the confluence chamber in a case where a pressure of the fluid from the 2 nd input port toward the confluence chamber is higher than a pressure of the fluid from the spool hole toward the confluence chamber,

the spool has a hollow hole opened toward the confluence chamber and an inlet hole and an outlet hole opened to the hollow hole, and is movable to a position where the inlet hole is connected to the 1 st input port and blocks the outlet hole and a position where the inlet hole is blocked,

the 2 nd input port opens to the confluence chamber along the axial direction and opens to the outside of the valve body,

the valve body has: a1 st valve housing portion having the valve post hole; and a 2 nd valve housing part having the merging chamber, the 2 nd valve housing part being attached to the 1 st valve housing part,

the solenoid valve is configured as an electromagnetic proportional valve.

8. A working machine, wherein,

the work machine comprises a solenoid valve according to claim 1.

9. A working machine, wherein,

the work machine comprising a solenoid valve according to claim 7.

Technical Field

The present invention relates to a solenoid valve having a function of a shuttle valve that selectively supplies a fluid supplied according to an excitation current and a fluid from another path, and a work machine including the solenoid valve.

Background

A shuttle valve is a valve that: the fluid switching device comprises two input ports and an output port, and high-pressure fluid in fluid flowing into the two input ports is selectively enabled to flow out of the output port. For example, patent document 1 discloses a hydraulic circuit including a shuttle spool and an electromagnetic proportional valve, in which two oil passages extending from two output ports of the electromagnetic proportional valve are connected to the shuttle spool. Thereby, of the pressure oil from the two oil passages, the pressure oil having a relatively high pressure is selectively supplied to the pressure oil supply target (main control unit).

Disclosure of Invention

Problems to be solved by the invention

In the technique of patent document 1, a unit incorporating a shuttle spool is disposed radially outside a spool type electromagnetic proportional valve, and the unit and the electromagnetic proportional valve are integrated. Such a structure has been used in many cases, but since the structure including the electromagnetic proportional valve and the shuttle spool is large in size, there is room for improvement in terms of improvement in the degree of freedom of arrangement and operability.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a solenoid valve and a working machine that can maintain a basic function of controlling the supply of fluid in accordance with an excitation current and can compactly incorporate a fluid selection function of a shuttle spool.

Means for solving the problems

The electromagnetic valve of the present invention includes:

a valve main body provided with a spool hole having a1 st input port and a confluence chamber connected to the spool hole and having a 2 nd input port;

a spool disposed inside the spool hole;

a drive section for moving the spool in an axial direction; and

and a moving member that is disposed inside the merging chamber and closes the 2 nd input port when a pressure of the fluid flowing from the spool hole to the merging chamber is higher than a pressure of the fluid flowing from the 2 nd input port to the merging chamber.

When the pressure of the fluid flowing from the 2 nd input port toward the confluence chamber is higher than the pressure of the fluid flowing from the spool hole toward the confluence chamber, the movable body may block the connection between the spool hole and the confluence chamber.

The spool may have a hollow hole that opens toward the confluence chamber, and an inlet hole and an outlet hole that open into the hollow hole, and may be movable to a position where the inlet hole is connected to the 1 st input port and blocks the outlet hole and a position where the inlet hole is blocked.

The 2 nd input port may be open to the confluence chamber along the axial direction and to the outside of the valve body.

The valve main body may have: a1 st valve housing portion having the valve post hole; and a 2 nd valve box part having the merging chamber, the 2 nd valve box part being attached to the 1 st valve box part.

The electromagnetic valve of the present invention may be configured as an electromagnetic proportional valve.

Further, the electromagnetic valve of the present invention includes:

a valve main body provided with a spool hole having a1 st input port and a confluence chamber connected to the spool hole and having a 2 nd input port;

a spool disposed inside the spool hole;

a drive section for moving the spool in an axial direction; and

a moving body that is disposed inside the merging chamber and closes the 2 nd input port when a pressure of the fluid flowing from the spool hole toward the merging chamber is higher than a pressure of the fluid flowing from the 2 nd input port toward the merging chamber,

the moving body blocks a connection between the spool hole and the confluence chamber in a case where a pressure of the fluid from the 2 nd input port toward the confluence chamber is higher than a pressure of the fluid from the spool hole toward the confluence chamber,

the spool has a hollow hole opened toward the confluence chamber and an inlet hole and an outlet hole opened to the hollow hole, and is movable to a position where the inlet hole is connected to the 1 st input port and blocks the outlet hole and a position where the inlet hole is blocked,

the 2 nd input port opens to the confluence chamber along the axial direction and opens to the outside of the valve body,

the valve body has: a1 st valve housing portion having the valve post hole; and a 2 nd valve housing part having the merging chamber, the 2 nd valve housing part being attached to the 1 st valve housing part,

the solenoid valve is configured as an electromagnetic proportional valve.

In addition, the work machine of the present invention includes the above-described solenoid valve.

ADVANTAGEOUS EFFECTS OF INVENTION

The solenoid valve of the present invention can maintain the basic function of controlling the supply of fluid according to the exciting current and compactly incorporate the fluid selecting function of the shuttle valve.

Drawings

Fig. 1 is a schematic cross-sectional view of a solenoid valve according to an embodiment of the present invention.

Description of the reference numerals

1. An electromagnetic valve; 11. a valve body; 111. a1 st valve box part; 112. a 2 nd valve box part; 12. a spool; 13. a drive section; 14. a moving body; 15. a valve seat member; 15A, connecting holes; 16. an elastic member; 21. a valve post bore; 22. a confluence chamber; 31. 1 st input port; 32. a 2 nd input port; 33. a discharge port; 34. an output port; 40. a hollow bore; 41. an inlet aperture; 43. an outlet aperture; 51. a plunger; c1, axial direction of the valve post bore.

Detailed Description

Hereinafter, a solenoid valve 1 according to an embodiment of the present invention will be described with reference to the drawings. The solenoid valve 1 shown in fig. 1 is an electromagnetic proportional valve that controls supply of pressure oil as a fluid and supply pressure of the pressure oil in accordance with an excitation current, and is connected to a hydraulic device such as a hydraulic actuator, for example, so that pressure oil of a desired pressure can be supplied to the hydraulic device. The solenoid valve 1 may be incorporated in a working machine such as a working vehicle. The work vehicle is an excavator, a loader, a bulldozer, a dump truck, or the like.

The electromagnetic proportional valve includes a positive electromagnetic proportional valve and a negative electromagnetic proportional valve. The electromagnetic proportional valve in which the pressure of the fluid output increases as the exciting current increases is classified as a positive type electromagnetic proportional valve, and the electromagnetic proportional valve in which the pressure of the fluid output decreases as the exciting current increases is classified as a negative type electromagnetic proportional valve. The present invention is applicable to either a positive-type electromagnetic proportional valve or a negative-type electromagnetic proportional valve, and the electromagnetic valve 1 is configured as a positive-type spool electromagnetic proportional valve.

The solenoid valve 1 of the present embodiment includes: a valve main body 11 having a spool hole 21 and a merging chamber 22; a spool 12 which is a shaft-like member slidably disposed inside the spool hole 21; a drive unit 13 that moves the spool 12 in the axial direction C1 of the spool hole 21 by electromagnetic force; and a moving body 14 disposed inside the confluence chamber 22. In the valve main body 11, the merging chamber 22 is fluidly connected to the spool hole 21 from one side (lower side in the drawing) in the axial direction C1. The valve main body 11 has: a1 st valve box portion 111 having a cylindrical shape and having a valve column hole 21; and a 2 nd valve box part 112 having the merging chamber 22, the 2 nd valve box part 112 being attached to the 1 st valve box part 111.

One end of the 1 st valve housing portion 111 in the axial direction C1 is cylindrical, and the 2 nd valve housing portion 112 and the 1 st valve housing portion 111 are integrated by fitting the outer peripheral surface of the end into an insertion cylindrical portion 112A provided in the 2 nd valve housing portion 112. The merging chamber 22 is open inside the insertion tube portion 112A, and is fluidly connected to the spool hole 21 through the open portion.

An annular valve seat member 15 is press-fitted to an inner peripheral surface of one end portion of the 1 st valve housing portion 111 in the axial direction C1, a communication hole 15A is provided at the center of the annular valve seat member 15, and the merging chamber 22 is connected to the inside of the column hole 21 via the communication hole 15A of the valve seat member 15. Here, the moving body 14 in the joining chamber 22 is a sphere, and the moving body 14 can be fitted into the connecting hole 15A to block the connection between the stem hole 21 and the joining chamber 22.

An elastic member 16 made of a coil spring is provided between a surface of the valve seat member 15 facing the opposite side to the merging chamber 22 side and the spool 12, and the valve seat member 15 also functions as a spring seat surface. The driving unit 13 is disposed on the opposite side of the spool 12 from the merging chamber 22 side in the axial direction C1, and is capable of moving the spool 12 toward the merging chamber 22 side in response to an excitation current. When the spool 12 moves toward the merging chamber 22, the elastic member 16 is compressed, and the biasing force for pushing back the spool 12 toward the driving unit 13 is accumulated in the elastic member 16.

The valve main body 11 is provided with a1 st input port 31 and a discharge port 33 that open into the valve column hole 21, and a 2 nd input port 32 and an output port 34 that open into the merging chamber 22, in addition to the above-described valve column hole 21 and merging chamber 22. In other words, the spool hole 21 has the 1 st input port 31 and the discharge port 33, and the merging chamber 22 has the 2 nd input port 32 and the output port 34. The 1 st input port 31 and the discharge port 33 are provided in the 1 st tank portion 111, and open to the spool hole 21 along the radial direction of the spool hole 21 and open to the outside from the outer peripheral surface of the 1 st tank portion 111, respectively. In the present embodiment, the 1 st input port 31 is disposed closer to the merging chamber 22 than the discharge port 33 in the axial direction C1, but the opposite arrangement may be adopted.

On the other hand, the 2 nd input port 32 and the output port 34 are provided in the 2 nd valve box portion 112. The output port 34 opens to the merging chamber 22 along the radial direction of the spool hole 21 and opens to the outside from the outer peripheral surface of the 2 nd valve housing portion 112. The 2 nd input port 32 is provided in a wall portion of the 2 nd valve box portion 112 on the side opposite to the side facing the spool hole 21, opens to the merging chamber 22 along the axial direction C1, and opens to the outside from the outer peripheral surface of the 2 nd valve box portion 112.

The 1 st input port 31 is connected to a hydraulic pressure source P for supplying pressure oil, and the drain port 33 is connected to a drain T for discharging pressure oil. The output port 34 is connected to, for example, a hydraulic device a1 to which pressure oil is supplied, and the 2 nd input port 32 is connected to, for example, a hydraulic source different from the hydraulic source P or an oil passage through which pressure oil is pressurized and fed.

The spool 12 is provided with a hollow hole 40 extending in the axial direction C1 and having one end in the axial direction C1 opened to the merging chamber 22 side, and an inlet hole 41 and an outlet hole 43 opened to the hollow hole 40. The inlet hole 41 and the outlet hole 43 are open to the hollow hole 40 along the radial direction of the spool hole 21 and open to the outside from the outer peripheral surface of the spool 12, respectively.

The inlet port 41 is connected to the 1 st input port 31, or faces the inner peripheral surface of the valve body 11, or is connected to the 1 st input port 31 and faces the inner peripheral surface of the valve body 11, depending on the position of the spool 12 in the axial direction C1. When the inlet hole 41 is connected to the 1 st input port 31, the pressure oil that has flowed into the 1 st 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 faces the inner peripheral surface of the valve main body 11, or is connected to the discharge port 33 and faces the inner peripheral surface of the valve main body 11, depending on the displacement position of the spool 12 in the axial direction C1. When the outlet port 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.

In the present embodiment, the outlet port 43 faces the inner peripheral surface of the valve body 11 when the inlet port 41 is connected to the 1 st input port 31, and the inlet port 41 faces the inner peripheral surface of the valve body 11 when the outlet port 43 is connected to the discharge port 33. Therefore, the spool 12 can be switched to a state in which the inlet port 41 is connected to the 1 st input port 31 and the connection between the outlet port 43 and the discharge port 33 is blocked and a state in which the outlet port 43 is connected to the discharge port 33 and the connection between the inlet port 41 and the 1 st input port 31 is blocked, according to the position (moving position) at which it is moved in the axial direction C1 by the drive portion 13.

Fig. 1 shows a non-excited state in which no field current flows to the driving unit 13 formed of a solenoid actuator, and the spool 12 is not moved toward the merging chamber 22 by the driving unit 13. At this time, the outlet port 43 of the spool 12 is connected to the discharge port 33 and blocks the inlet port 41. From this state, the spool 12 moves toward the merging chamber 22, and the state is changed such that the inlet port 41 is connected to the 1 st input port 31 and the outlet port 43 is blocked.

The driving unit 13 presses the spool 12 in the side of the axial direction C1, that is, the merging chamber 22 side, and the pressing force applied to the spool 12 can be changed in accordance with the applied current (that is, the excitation current). The driving unit 13 of the present embodiment is constituted by a solenoid actuator in which an electromagnet (not shown) and a plunger 51 are combined. However, the specific configuration of the solenoid actuator is not limited, and the driving unit 13 may be configured by any solenoid actuator that determines the pressing force applied from the plunger 51 to the spool 12 according to the magnitude of the excitation current.

As described above, for example, a hydraulic pressure source different from the hydraulic pressure source P and an oil passage for pressurizing and feeding pressure oil are connected to the 2 nd input port 32. In this case, the following situation may occur: the pressure oil that has flowed into the 1 st input port 31 flows into the merging chamber 22 and the pressure oil that has flowed into the 2 nd input port 32 flows into the merging chamber 22, but in this case, the merging chamber 22 and the moving body 14 function as a shuttle valve in the present embodiment.

That is, when the pressure (hydraulic pressure) of the pressure oil directed from the 1 st input port 31 to the confluence chamber 22 via the hollow hole 40 and the spool hole 21 is higher than the pressure of the pressure oil directed from the 2 nd input port 32 to the confluence chamber 22 when the inlet hole 41 is connected to the 1 st input port 31, the moving body 14 closes the 2 nd input port 32. On the other hand, when the pressure of the pressure oil directed from the 2 nd input port 32 to the joining chamber 22 is higher than the pressure of the pressure oil directed from the 1 st input port 31 to the joining chamber 22 via the hollow hole 40 and the spool hole 21 when the inlet hole 41 is connected to the 1 st input port 31, the moving body 14 is seated on the valve seat member 15, and the connection between the spool hole 21 and the joining chamber 22 is blocked.

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

When no current is applied to the drive unit 13 or the 1 st current is applied to the drive unit 13, the spool 12 is disposed at the initial position shown in fig. 1. In this case, the spool hole 21 is connected to the discharge port 33 via the outlet port 43, the inlet port 41 is not connected to the 1 st input port 31, and the pressure oil from the 1 st input port 31 does not flow into the spool hole 21.

When the 2 nd current larger than the 1 st current is applied to the driving unit 13 from the above state, the spool 12 is pressed toward the merging chamber 22 side by the plunger 51 of the driving unit 13 in the axial direction C1, the inlet port 41 is connected to the 1 st input port 31, and the pressure oil from the 1 st input port 31 flows into the spool hole 21.

Here, when the pressure oil directed to the merging chamber 22 is supplied to the 2 nd input port 32 as well, the moving body 14 closes the 2 nd input port 32 when the pressure of the pressure oil directed to the merging chamber 22 from the 1 st input port 31 via the hollow hole 40 and the spool hole 21 is higher than the pressure of the pressure oil directed to the merging chamber 22 from the 2 nd input port 32. On the other hand, when the pressure of the pressure oil directed from the 2 nd input port 32 to the joining chamber 22 is higher than the pressure of the pressure oil directed from the 1 st input port 31 to the joining chamber 22 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 joining chamber 22 is blocked. Thereby, of the pressure oil from the 1 st input port 31 and the pressure oil from the 2 nd input port 32, the pressure oil having a higher pressure is output from the output port 34.

In the present embodiment described above, when the supply and shutoff of the pressure oil from the 1 st input port 31 are switched depending on the position of the exciting current control spool 12 and the pressure oil from the 1 st input port 31 is supplied to the merging chamber 22 and the pressure oil to the merging chamber 22 is also supplied to the 2 nd input port 32, the merging chamber 22 and the movable body 14 therein function as a shuttle spool. Thereby, of the pressure oil from the 1 st input port 31 and the pressure oil from the 2 nd input port 32, the pressure oil having a higher pressure can be selectively output from the output port 34.

Here, the merging chamber 22 functioning as a shuttle valve and the movable member 14 inside the merging chamber are provided in the valve body 11 in alignment with the valve body 11 and the spool 12 in the axial direction C1, thereby suppressing the radial protrusion of the merging chamber 22 and the movable member 14 inside the merging chamber. Thus, according to the present embodiment, the fluid selection function of the shuttle valve can be compactly incorporated while maintaining the basic function of controlling the supply of fluid in accordance with the excitation current.

The 2 nd input port 32 opens to the merging chamber 22 along the axial direction C1 and also opens to the outside of the valve main body 11, specifically, to the outside of the 2 nd tank portion 112. In this case, the pressure oil directed from the 2 nd input port 32 to the merging chamber 22 can flow into the merging chamber 22 through a straight simple oil passage, and the pressure oil can be made to face the pressure oil from the 1 st input port 31 through the mobile unit 14. Thus, the function of the shuttle valve can be realized without complicating the path of the pressure oil (fluid).

Further, the valve main body 11 includes: a1 st valve box portion 111 having a spool hole 21; and a 2 nd valve box part 112 having the merging chamber 22, the 2 nd valve box part 112 being attached to the 1 st valve box part 111. This facilitates formation of the output port 34 and the 2 nd input port 32 of the 2 nd valve box portion 112, and therefore, the efficiency of manufacturing the solenoid valve 1 can be improved.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications may be made in the above embodiments.

For example, the valve main body 11 of the above embodiment includes: a1 st valve housing portion 111 provided with a1 st input port 31 and a discharge port 33; and a 2 nd valve housing part 112 provided with a 2 nd input port 32 and an output port 34, and the 1 st valve housing part 111 and the 2 nd valve housing part 112 are independent members, but the valve main body 11 may have a structure in which the 1 st input port 31, the discharge port 33, the 2 nd input port 32, and the output port 34 are provided in one member.