KR102667999B1 - Solenoid valves, directional control valves and construction machinery - Google Patents

Abstract

Provided are a solenoid valve that does not require a flange portion for installation, and a direction change valve and construction machinery provided with such a solenoid valve.
The electromagnetic valve 10 includes a first fixing part 34, a second fixing part 35, and a driving part 11. The first fixing portion 34 has a first connection port P1 connected to the hydraulic device, and can be secured to the connecting portion of the hydraulic device. The second fixing portion 35 has a second connection port P2 connected to a hydraulic pressure supply source, and can be fixed to the connection portion of the hydraulic pressure supply source. The driving unit 11 has a flow path C3 directly or indirectly connected to the first connection port (P1) and another channel directly or indirectly connected to the second connection port (P2) by the exciting current applied to the solenoid unit. Change the cross-sectional area of the confluence of the flow path (C6).

Description

Solenoid valves, directional valves and construction machinery {SOLENOID VALVES, DIRECTIONAL CONTROL VALVES AND CONSTRUCTION MACHINERY}

The present invention relates to electromagnetic valves, directional valves, and construction machinery.

In hydraulic devices, electromagnetic valves with excellent response speed are widely used as valve elements that control the flow of hydraulic oil. In particular, in recent years, the demand for electrically driving hydraulic devices has increased, and it is expected that the use of electromagnetic valves will gradually expand in the future.

Patent Document 1 discloses an electromagnetic proportional valve, which is a type of electromagnetic valve. This electromagnetic proportional valve includes a driving device having a solenoid coil and a driving rod, a valve whose flow path configuration is changed by the driving device, and a flange portion having an installation hole. The electromagnetic proportional valve of Patent Document 1 is installed on an installation object such as a direction change valve using an installation tool (screw, etc.) inserted into an installation hole of the flange portion.

Japanese Patent Publication No. 2017-20541 Japanese Patent Publication No. 08-170353

A normal electromagnetic valve, like the electromagnetic proportional valve of Patent Document 1, is installed on an installation object such as a direction change valve through a flange portion. Therefore, when designing a solenoid valve, it is necessary to consider the size and shape of the flange portion. Also, when forming an installation hole in the flange portion, high processing precision is required with respect to the location and size of the installation hole.

Also, for example, if the placement space for the solenoid valve is limited and sufficient space for the flange cannot be secured, or if the installation target is not suitable for the flange section, the solenoid valve cannot be installed on the installation target. .

The present invention has been made in light of the above-mentioned circumstances, and its purpose is to provide a solenoid valve that does not require a flange portion for installation, and a direction change valve and construction machinery provided with such a solenoid valve.

One aspect of the present invention has a first connection port connected to a hydraulic device, a first fastening portion capable of being attached to a connection portion of the hydraulic device, and a second connection port connected to a hydraulic power source, and a connection portion of the hydraulic power supply source. The cross-sectional area of the confluence of the flow path directly or indirectly connected to the first connection port and the other flow path directly or indirectly connected to the second connection port is determined by the exciting current applied to the second connection port and the solenoid section. It relates to an electromagnetic valve having a changing driving unit.

The hydraulic device may be a directional valve.

The hydraulic pressure source may be a hydraulic pump.

The second connection port may be perpendicular to the first connection port.

The first fixing portion may have a screw structure.

The first connection port may be located on the side opposite to the drive unit through the installation surface of the installation unit.

The first connection port may be located on the same side as the drive unit with respect to the installation surface of the installation unit.

The second connection port may be located on the same side as the drive unit with respect to the installation surface of the installation unit.

The solenoid valve may have a third connection port connected to the tank and may be provided with a third fixing portion that can be attached to the connection portion of the tank.

The third connection port may be located on the same side as the drive unit with respect to the installation surface of the installation unit.

Another aspect of the present invention has a first connection port connected to a hydraulic device, a first fastening portion capable of being attached to a connection portion of the hydraulic device, and a second connection port connected to a hydraulic power source, and a connection portion of the hydraulic power supply source. It has a second fixing part that can be attached to and a third connection port connected to the tank, and the third fixing part that can be attached to the connection part of the tank and the solenoid part are directly or directly connected to the first connection port by an exciting current applied to the solenoid part. A confluence of an indirectly connected flow path and another flow path directly or indirectly connected to the second connection port, and another flow path directly or indirectly connected to the first connection port and another flow path directly or indirectly connected to the third connection port. It relates to an electromagnetic valve having a driving part that changes the cross-sectional area of at least one of the confluence parts of the flow path.

Another aspect of the present invention relates to a directional control valve provided with the electromagnetic valve described above.

Another aspect of the present invention relates to a construction machine provided with the above-described direction change valve.

According to the present invention, it is possible to provide an electromagnetic valve that does not require a flange portion for installation, and a direction change valve and construction machinery provided with such an electromagnetic valve.

1 is a side view showing the schematic configuration of an example of a solenoid valve.
Fig. 2 is a side view showing the schematic configuration of another example of a solenoid valve.
Fig. 3 is a side view showing the schematic configuration of another example of a solenoid valve.
Fig. 4 is a side view showing an example of the specific configuration of the solenoid valve.
Fig. 5 is a side view showing another example of the specific configuration of the solenoid valve.
Fig. 6 is a side view showing another example of the specific configuration of the solenoid valve.
Fig. 7 is a cross-sectional view showing an example of a direction change valve.
Fig. 8 is an external view schematically showing a typical configuration example of a hydraulic excavator.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the schematic structure of a typical solenoid valve will be described (see FIGS. 1 to 3). Next, a more specific configuration example of the solenoid valve will be described (see FIGS. 4 to 6). In addition, each element constituting the electromagnetic valve is schematically shown in FIGS. 1 to 6, and each element shown in FIGS. 1 to 6 is not necessarily shown in the exact shape and size.

[Schematic example of configuration of solenoid valve]

1 is a side view showing the schematic configuration of an example of the solenoid valve 10.

The electromagnetic valve 10 shown in FIG. 1 includes a driving part 11, a hydraulic part 12, and an installation part 13.

The drive unit 11 is disposed on one side (upper side in FIG. 1) with respect to the installation unit 13, and has a solenoid unit 20 and a plunger (movable iron core) 21. The solenoid unit 20 is a magnetic force generating device that generates magnetic force according to the applied exciting current, and is composed of a solenoid coil. Depending on the current applied to the solenoid unit 20, the position of the plunger 21 in the first direction D1 changes, and the amount of movement of the plunger 21 from the solenoid unit 20 changes. The plunger 21 is disposed on the central axis (not shown) of the solenoid valve 10 extending in the first direction D1, and moves in the first direction D1 under the influence of magnetic force from the solenoid portion 20. Round trip transportation is available. In this way, the first direction D1 corresponds to the direction in which the plunger 21 moves.

The plunger 21 may be composed of a single member or may be composed of a combination of a plurality of members. When the plunger 21 is composed of a single member, the plunger 21, influenced by the magnetic force from the solenoid portion 20, can directly contact the hydraulic portion 12 (for example, a spool to be described later). do. When the plunger 21 is composed of a plurality of members, the member directly affected by the magnetic force from the solenoid portion 20 and the member in contact with the hydraulic portion 12 (e.g., a spool to be described later) are different. It is possible. In this case, the member of the plunger 21 in contact with the hydraulic unit 12 receives force from the member of the plunger 21 that is directly affected by the magnetic force from the solenoid unit 20, and moves toward the hydraulic unit 12. It is possible to move.

The specific configuration of the solenoid portion 20 and plunger 21 is not limited. The drive unit 11 may adopt a method (a so-called pull-type drive method) that operates the plunger 21 mainly by magnetic force generated by the solenoid unit 20. Additionally, the drive unit 11 may adopt a method (so-called push-type drive method) that operates the plunger 21 according to the balance between the magnetic force generated by the solenoid portion 20 and the physical force applied from the push bar.

The current flowing through the solenoid unit 20 is controlled by a control unit (not shown). The control unit is connected to an operation unit (e.g., an operation lever unit, an operation panel, etc.) that is directly operated by the operator of a hydraulic device (e.g., a work machine such as a construction machine) on which a solenoid valve is mounted, and the state of the operation unit is connected to the control unit. An operation command signal according to is input from the operation unit. The control unit controls the current flowing through the solenoid unit 20 in accordance with the operation command signal input by the operator through the operation unit. In this way, the operation of the drive unit 11 (i.e., the position of the plunger 21) is controlled by the control unit, and the drive unit 11 changes the structure of the flow path of the hydraulic unit 12.

The solenoid portion 20 shown in FIG. 1 is covered and surrounded by the housing portion 23. Additionally, not only the solenoid portion 20 but also at least a portion of the hydraulic portion 12 may be surrounded by a housing portion (not shown). For example, the housing part can be made of a member having a cylindrical (for example, cylindrical) side wall part, and inside this housing part, the solenoid part 20, the plunger 21, and the hydraulic part 12 are provided. At least part of it can be placed. The elements of the driving part 11 and the elements of the hydraulic part 12 (for example, the solenoid part 20, the plunger 21, and the valve body 60) disposed inside the housing part are directly or indirectly connected to the housing part. is installed for. In this way, the housing unit may be provided as one of the elements constituting the drive unit 11, or may be provided as one of the elements constituting the hydraulic unit 12.

The hydraulic section 12 has a flow path forming portion 25 provided in the valve body 60. A flow path (not shown in FIG. 1) is provided in the flow path forming portion 25, and the structure of the flow path of the flow path forming portion 25 changes depending on the position of the plunger 21 with respect to the hydraulic portion 12. The flow path included in the flow path forming portion 25 herein includes not only a flow path located inside the valve body 60 but also a flow path formed in the valve body 60. The method of changing the flow path configuration in the flow path forming portion 25 is not particularly limited. For example, the flow path configuration of the flow path forming portion 25 may be changed by using a spool provided to be movable while being pressed by the plunger 21. It is possible to change it.

The hydraulic unit 12 has a first fixing part 34, a second fixing part 35, and a third fixing part 36. Each of the first fixing part 34, the second fixing part 35, and the third fixing part 36 is provided so that it can be fixed to the connection part of the corresponding installation object (for example, a hydraulic device). The first fixing portion 34 shown in FIG. 1 has a first thread portion 37 having a screw structure (particularly a male screw structure). The first threaded portion 37 constitutes at least a portion of the outer peripheral portion of the first fastening portion 34, and the first threaded portion 37 shown in FIG. 1 constitutes the entire side surface of the first fastening portion 34. . The first fastening portion 34 can be screwed to a corresponding connection portion to be installed via the first threaded portion 37. Since the first threaded portion 37 shown in FIG. 1 has a male threaded structure, the connection portion to be installed that is fixed to the first fastening portion 34 is required to have a female threaded structure. Although not shown in FIG. 1, each of the second fastening portion 35 and the third fastening portion 36 is also a fastening portion (for example, a screw structure (male screw structure or female screw structure)) that can be fastened to the connection part of the corresponding installation target. ) can be provided.

The first fixing part 34, the second fixing part 35, and the third fixing part 36 are each connected to the flow path of the hydraulic part 12 (particularly, the flow path of the flow path forming part 25). It has a first connection port (P1), a second connection port (P2), and a third connection port (P3). In a state where each of the first fixing part 34, the second fixing part 35, and the third fixing part 36 is fixed to the corresponding installation target connection part, the first connection port P1 and the second connection port Each of (P2) and the third connection port (P3) is connected to the port and flow path of the corresponding installation target.

The object to which the first connection port (P1), the second connection port (P2), and the third connection port (P3) are connected is not fundamentally limited, but is typically an actuator (for example, a hydraulic device such as a direction change valve) ) (A), a first connection port (P1), a second connection port (P2), and a third connection port (P1) to the pump (e.g., hydraulic pressure source such as a hydraulic pump) (P) and the tank (hydraulic oil outlet) (T). The connection port (P3) can be connected. In the solenoid valve 10 of FIG. 1, the first connection port P1 acts as an actuator port connected to the actuator A, and the second connection port P2 acts as a pump port connected to the pump P. And, the third connection port (P3) acts as a tank port connected to the tank (T). In addition, the number of ports that the hydraulic unit 12 has is not limited, and in addition to the first connection port (P1), the second connection port (P2), and the third connection port (P3), one or more ports are connected to the hydraulic unit 12. You can have more.

Each of the first fastening portion 34, the second fastening portion 35, and the third fastening portion 36 may be provided integrally with the valve body 60 or may be provided as a separate body. That is, each of the valve body 60 and the first fixing part 34, the second fixing part 35, and the third fixing part 36 may be composed of a single member that is basically inseparable, and may be separated. The valve body 60 and the first fastening portion 34, the second fastening portion 35, and the third fastening portion 36 may each be comprised of a plurality of members. When each of the valve body 60 and the first fixing part 34, the second fixing part 35, and the third fixing part 36 is composed of a plurality of separable members, these plural members are fixed to each other. Each of the first fastening portion 34, the second fastening portion 35, and the third fastening portion 36 is fixedly provided with respect to the valve body 60. In the hydraulic unit 12 shown in FIG. 1, the second fixing part 35 and the third fixing part 36 are composed of the valve body 60, but the first fixing part 34 is composed of the valve body 60. ), and the member constituting the first fixing portion 34 is fixed to the valve body 60 by fixing means (for example, screw fixing).

The configuration and arrangement of the first connection port (P1), the second connection port (P2), and the third connection port (P3) are not limited, and the first connection port (P1), the second connection port (P2), and the third connection port (P3) are not limited. The direction of the connection port P3 is not limited. At least one of the first connection port (P1), the second connection port (P2), and the third connection port (P3) moves in the first direction D1 (in particular, the plunger 21 moves toward the hydraulic unit 12). (direction) may be facing. In the solenoid valve 10 shown in FIG. 1, the first connection port P1 faces the side opposite to the solenoid portion 20 (i.e., the lower direction in FIG. 1) in the first direction D1, and the second connection port P1 Each of the port (P2) and the third connection port (P3) faces a second direction (D2) perpendicular to the first direction (D1), and the second connection port (P2) and the third connection port (P3) Each of forms a right angle to the first connection port (P1).

Additionally, at least two of the first connection port P1, the second connection port P2, and the third connection port P3 may face the first direction D1. In this case, the at least two connection ports facing the first direction D1 may include a plurality of parallel ports, and the plurality of parallel ports may be located outside each other. For example, all of the first connection port (P1), the second connection port (P2), and the third connection port (P3) are on the opposite side from the solenoid portion 20 in the first direction D1 (i.e., in FIG. 1 They may be provided as parallel arrangement ports facing the lower direction, and may be positioned outside each other. Moreover, the 1st connection port P1, the 2nd connection port P2, and the 3rd connection port P3 provided as parallel arrangement ports may be lined up in a straight line in one row, or may be lined up at equal intervals. Moreover, at least two of the first connection port P1, the second connection port P2, and the third connection port P3 may have a common central axis extending in the first direction D1. In this way, one fastening portion (for example, the first fastening portion 34) may be provided with a plurality of connection ports.

Additionally, the cross-sectional shape and cross-sectional size (ie, cross-sectional diameter) of the first connection port (P1), the second connection port (P2), and the third connection port (P3) are not limited. The first connection port (P1), the second connection port (P2), and the third connection port (P3) may have the same cross-sectional shape and/or cross-sectional size, or may have different cross-sectional shapes and/or cross-sectional sizes. You can stay.

When an installation object (for example, a hydraulic device) is fixed to the first fixing part 34, the installation part 13 has an installation surface 13a that faces the installation object. In a state where the installation object is fixed to the first fixing portion 34, the installation surface 13a may or may not be in contact with the installation object. By bringing the installation object into contact with the installation surface 13a while the installation object is fixed to the first fixing portion 34, the installation object can be accurately positioned.

As described above, the solenoid unit 20 and the hydraulic unit 12 are provided at different positions with respect to the first direction D1. Additionally, the drive unit 11, the hydraulic unit 12, and the installation unit 13 are provided to be penetrated by the central axis of the solenoid valve 10 extending in the first direction D1. Moreover, in the solenoid valve 10 shown in FIG. 1 mentioned above, the 1st connection port P1 is located on the opposite side from the drive part 11 through the installation surface 13a. That is, the first fixing portion 34 provided with the first connection port P1 is located on the opposite side to the driving portion 11 through the installation surface 13a.

In addition, the hydraulic unit 12 has one or more other connection ports (i.e., second connection ports) that are different from the first connection port P1 and are connected to the flow path of the hydraulic unit 12 (especially the flow path forming portion 25). (P2) and a third connection port (P3). These other one or more connection ports (i.e., the second connection port P2 and the third connection port P3) are located on the same side as the drive unit 11 with respect to the installation surface 13a. In addition, the hydraulic unit 12 includes one or more other fixing parts (i.e., the second fixing part 35 and the third fixing part 36) that are different from the first fixing part 34 and can be attached to the connection part of the corresponding installation target. has, and the other one or more fixing parts (i.e., the second fixing part 35 and the third fixing part 36) have one or more other connection ports (i.e., the second connection port (P2) and the third connection port ( P3)) is provided.

Additionally, a part of the hydraulic unit 12 is disposed on the drive unit 11 side rather than the installation unit 13. The portion of the hydraulic unit 12 provided on the opposite side from the drive unit 11 via the installation surface 13a has a flow path connected to the first connection port P1. The part of the hydraulic part 12 provided on the same side as the drive part 11 with respect to the installation surface 13a has a flow path connected to the 2nd connection port P2 and the 3rd connection port P3. At least one of the first connection port (P1), the second connection port (P2), and the third connection port (P3) (e.g., the first connection port (P1), the second connection port (P2), and the third connection port (P3) The connection port (P3) may not be provided at a position opposite to the solenoid unit 20 (drive unit 11) via the installation portion 13 (especially the installation surface 13a), or may be provided.

FIG. 2 is a side view showing the schematic configuration of another example of the solenoid valve 10. In the solenoid valve 10 shown in FIG. 2, elements that are the same or similar to those of the solenoid valve 10 shown in FIG. 1 above are given the same symbols, and detailed descriptions thereof are omitted.

In the solenoid valve 10 shown in FIG. 2, the first connection port P1 is located on the same side as the drive unit 11 with respect to the installation surface 13a. Additionally, the first threaded portion 37 of the first fixing portion 34 has a female threaded structure. Therefore, the connection part of the corresponding installation object that is fixed to the first fixing part 34 is required to have a male thread structure. Additionally, the installation portion 13 in FIG. 2 is composed of a first fixing portion 34, and the installation surface 13a is composed of an end surface of the first fixing portion 34. Additionally, the first fixing portion 34 is composed of a valve body 60.

In the solenoid valve 10 having the above-described configuration, the flow path of the hydraulic unit 12 is disposed overall on the side of the drive unit 11 rather than the installation surface 13a, and the hydraulic unit 12 is located on the installation surface 13a. It is not disposed on the side opposite to the driving unit 11. Therefore, the solenoid valve 10 shown in FIG. 2 has no member protruding from the installation surface 13a in the first direction D1 (particularly in the direction opposite to the drive unit 11), and has a first fixing portion 34. ) can be installed on the installation object through the first threaded portion 37 and the external threaded portion of the installation object. In this case, it is also possible to place an O-ring (R) at the boundary between the first threaded portion 37 and the installation surface 13a, or near the boundary, so that the pressure oil from between the solenoid valve 10 and the installation object is Leakage can be prevented with an O-ring (R).

FIG. 3 is a side view showing the schematic configuration of another example of the solenoid valve 10. In the electromagnetic valve 10 shown in FIG. 3, elements that are the same or similar to those of the electromagnetic valve 10 shown in FIGS. 1 and 2 above are given the same symbols, and detailed descriptions thereof are omitted.

The first fixing part 34 of the solenoid valve 10 shown in FIG. 3 is located on the opposite side from the driving part 11 through the flow path forming part 25 of the valve body 60. The first fixing portion 34 has a first joint body 77 and a second joint body 78. The first joint body 77 is fixed to the valve body 60 and may be provided integrally with the valve body 60 or may be provided as a separate body. The second joint body (78) is fixed to the first joint body (77). In the example shown in FIG. 3, the protrusion extending in the second direction D2 of the first joint body 77 and the protrusion extending in the second direction D2 of the second joint body 78 are engaged with each other. , the second joint body 78 is fixed to the first joint body 77. Additionally, the first threaded portion 37 of the second joint body 78 of the first fixing portion 34 has a female threaded structure. Therefore, the connection part to be installed that is fixed to the first fixing part 34 shown in FIG. 3 is required to have a male thread structure. Additionally, the illustrated installation portion 13 is composed of a first fastening portion 34 (particularly the first joint body 77), and the installation surface 13a is composed of a first fastening portion 34 (particularly the first joint body 77). (77)) It is composed of the end face of (77)). Accordingly, the first connection port P1 of the first fixing portion 34 is located on the same side as the driving portion 11 with respect to the installation surface 13a.

Additionally, the installation portion 13 and the installation surface 13a do not necessarily need to be comprised of the first joint body 77. For example, as indicated by symbols “13'” and “13'a” in FIG. 3, an installation portion and an installation surface may be formed by the valve body 60. In this case, the installation object (for example, a hydraulic device) fixed to the first fixing portion 34 may be in contact with the installation surface 13'a, and may be installed while being disposed near the installation surface 13'a. It may be spaced apart from the surface 13'a. In this way, in the solenoid valve 10 shown in FIG. 3, when the installation portion 13' and the installation surface 13'a are formed by the valve body 60, the first fixing portion 34 has 1 Connection port P1 is located on the opposite side from the drive unit 11 through the installation surface 13'a.

As described above with reference to FIGS. 1 to 3, an attachment portion (e.g., first attachment portion 34) having a connection port (e.g., first connection port (P1)) is connected to an installation target (e.g., For example, by providing the solenoid valve 10 so that it can be directly attached to a connection part of a hydraulic device, it is possible to provide the solenoid valve 10 with excellent installation performance. In particular, according to the solenoid valve 10 described above, the flange part conventionally used to attach the solenoid valve to the installation object becomes unnecessary, making it possible to easily miniaturize and reduce the weight of the solenoid valve 10. Additionally, when designing the solenoid valve 10, there is no need to consider the size or shape of the flange portion, and forming a screw hole in the flange portion becomes unnecessary.

In addition, the first fixing portion 34 (particularly the first threaded portion 37) may be formed of a member different from the valve body 60, as shown in FIGS. 1 and 3, and as shown in FIG. 2. Likewise, it is also possible to be configured as part of the valve body 60. Additionally, the first threaded portion 37 may have a male thread structure as shown in FIG. 1, or may have a female thread structure as shown in FIGS. 2 and 3. In this way, the fixing structure of the first fixing part 34 (especially the first screw part 37) has a high degree of freedom, and the first screw part 37 can flexibly change the fixing structure (screw structure) according to the structure of the connection part to be installed. You can have it. Therefore, the electromagnetic valve 10 described above can be appropriately installed on various types of installation objects, and can also be installed on existing installation objects. Additionally, the fixing structure (screw structure) of the first fixing portion 34 and the first screw portion 37 described above can be applied to various types of solenoid valves and can also be added to existing solenoid valves.

In this way, the solenoid valve 10 according to the above-described embodiment can be flexibly and easily installed on various installation objects (for example, hydraulic devices such as control valves), and the solenoid valve 10 can be used to provide various It is possible to realize electric drive of the installation object.

[Specific configuration example of solenoid valve]

Next, a specific configuration example of the solenoid valve 10 will be described. The configuration of the electromagnetic valve 10 described below is only an example, and the electromagnetic valve 10 may have any other configuration.

FIG. 4 is a side view showing an example of a specific configuration of the solenoid valve 10. In FIG. 4, a cross section is shown of some of the components of the electromagnetic valve 10. Furthermore, in FIG. 4, some of the components of the solenoid valve 10 are omitted from illustration, and, for example, a portion of the drive unit 11 (in particular, the solenoid unit 20) is omitted from illustration. Among the elements constituting the electromagnetic valve 10 shown in FIG. 4, a detailed description of the elements described above will be omitted.

The electromagnetic valve 10 shown in FIG. 4 is configured as an electromagnetic proportional valve, and movement of the spool 62 in the first direction D1 is used to control the hydraulic portion 12 (in particular, the valve body 60). The flow path configuration of the flow path forming portion 25 is changed.

The hydraulic unit 12 shown in FIG. 4 includes a valve body 60 and a joint body 70 fixed to the valve body 60. Inside the valve body 60, a holding body 61 is fixedly provided via a plurality of O-rings (R). Each O-ring (R) performs a sealing function and prevents leakage of pressure oil. Additionally, in Fig. 4, in order to prevent the display from becoming complicated, the symbol “R” is not given to all of the O-rings R. Additionally, the joint body 70 may be provided integrally with the valve body 60. In this case, the installation screw portion 65 described later becomes unnecessary, and the O-ring R disposed between the valve body 60 and the joint body 70 becomes unnecessary, making it possible to miniaturize the device configuration.

The spool 62 is disposed in a receiving hole defined by the inner wall surface of the holding body 61, and is provided to be movable in the first direction D1 while being in close contact with the inner wall surface of the holding body 61. The portion where the spool 62 is in close contact with the valve body 60 has a liquid-tight structure, and hydraulic oil basically cannot pass through the close contact portion between the spool 62 and the valve body 60.

One end (upper end in FIG. 4) of the spool 62 in the first direction D1 is a portion pressed by the plunger 21 of the drive unit 11. When the plunger 21 is composed of a plurality of members, it is a member different from the member of the plunger 21 that is directly affected by the magnetic force from the solenoid portion 20, and is influenced by the magnetic force from the solenoid portion 20. Another member that is interlocked with the member that directly receives can be brought into contact with the end of the spool 62. The other end (lower end in FIG. 4 ) of the spool 62 in the first direction D1 is urged by the compression spring 63 . The compression spring 63 is disposed in the fourth flow path C4 surrounded by the holding body 61 and the spool 62, and moves between the spool 62 and the holding body 61 in the first direction D1. It is provided in a compressed state.

The spool 62 has a first flow path C1, a second flow path C2, and a third flow path C3. The first flow path C1 extends in the first direction D1, and each of the second flow path C2 and the third flow path C3 extends in the second direction D2 and also extends in the first flow path C1. You are connected. A through hole is provided at the end of the spool 62 on the plunger 21 side (upper end in Fig. 4), and the through hole is connected to the first flow path C1. A through hole is also provided at the other end of the spool 62 (the lower end in FIG. 4), and the through hole is configured as a part of the first flow path C1 and faces the fourth flow path C4. Each one end of the second flow path C2 and the third flow path C3 is connected to the first flow path C1, and the other end of the second flow path C2 and the third flow path C3 is connected to the first flow path C1. is open toward the holding body 61.

The fourth flow path C4 is configured as a part of the receiving hole of the holding body 61 in which the spool 62 is disposed, and the fourth flow path C4 is formed according to the position of the spool 62 in the first direction D1. ) (in particular, the length in the first direction D1) changes. The fourth flow path C4 is connected to the first connection port P1 through the flow path C included in the valve body 60 and the joint body 70. In addition, the plunger 21, the first flow path C1, the fourth flow path C4, the flow path C of the valve body 60 and the joint body 70, and the first connection port P1 are electronic It is disposed at a position penetrated by the central axis of the valve 10.

The holding body 61 has a fifth flow path C5 and a sixth flow path C6 extending in the second direction D2. Additionally, the seventh flow path C7 and the eighth flow path C8 are formed by the space between the holding body 61 and the valve body 60. The fifth flow path C5 is connected to the third connection port P3 through the seventh flow path C7, and the sixth flow path C6 is connected to the second connection port P2 through the eighth flow path C8. ) is connected to. The first connection port P1 faces the first direction D1 (particularly the direction opposite to the drive unit 11) and is connected to the actuator A. The second connection port (P2) is open in the second direction (D2) and is connected to the pump (P). The third connection port P3 opens in the second direction D2 and is connected to the tank T. The third fixing part 36 is provided so as to be able to be fixed to the connection part of the tank T.

The first fastening portion 34 having the first connection port P1 is provided with a first thread portion 37 having a male thread structure. The second fastening portion 35 having the second connection port P2 is provided with a second thread portion 38 having a female thread structure. The third fastening portion 36 having the third connection port P3 is provided with a third thread portion 39 having a female thread structure. The first fixing part 34 is composed of a joint body 70, and the second fixing part 35 and the third fixing part 36 are composed of a valve body 60. In the example shown, the first fastening portion 34 is composed of a joint body 70 provided separately from the valve body 60, but the joint body 70 is formed integrally with the valve body 60. Also, the first fixing portion 34 may be configured as the valve body 60.

The joint body 70 is a tubular member extending in the first direction D1, and a flow path C extending in the first direction D1 penetrates the joint body 70. The joint body 70 is located between the main body connection thread portion 72 located at one end, the external connection thread portion 74 located at the other end, and the main body connection thread portion 72 and the external connection thread portion 74. It has an adjustment screw portion 73 and a stopper portion 75 located between the main body connection thread portion 72 and the adjustment screw portion 73. The main body connection thread portion 72, the adjustment thread portion 73, and the external connection thread portion 74 have a male thread structure.

The valve body 60 has an installation thread portion 65 having a female thread structure. The joint body 70 is fixed to the valve body 60 by screwing the main body connection thread portion 72 to the installation thread portion 65. In a state where the joint body 70 is fixed to the valve body 60, the flow path C of the joint body 70 is connected to the flow path C of the valve body 60. The first connection port P1 is connected to the fourth flow path C4 and the first flow path C1 through the flow paths C of the joint body 70 and the valve body 60. Additionally, with the joint body 70 fixed to the valve body 60, an O-ring (R) is disposed between the valve body 60 and the joint body 70. The stopper portion 75 has a larger diameter than the flow path C of the valve body 60. As the stopper portion 75 contacts the valve body 60, the degree of insertion of the joint body 70 into the valve body 60 is determined.

The external connection thread portion 74 has a first thread portion 37 . The connection part to be installed is screwed to the first screw part 37 of the external connection screw part 74. Thereby, the solenoid valve 10 is fixed to the corresponding installation object, and the 1st connection port P1 is connected to the port and flow path which the connection part of the installation object has.

An adjustment nut 71 having a female thread structure is screwed to the adjustment screw portion 73. A washer 76 is provided between the adjustment nut 71 and the external connection thread portion 74. The installation object screwed to the first threaded portion 37 of the external connecting threaded portion 74 contacts the washer 76 and is pressed into contact with the adjusting nut 71 via the washer 76 . Therefore, in this example, the washer 76 serves as the installation portion 13 and the installation surface 13a. By rotating the adjustment nut 71 relative to the adjustment screw portion 73, the positions of the adjustment nut 71 and the washer 76 in the first direction D1 can be adjusted. By adjusting the positions of the adjustment nut 71 and the washer 76 in the first direction D1 in this way, the degree of insertion of the external connection threaded portion 74 into the connection portion to be installed is determined.

In the solenoid valve 10 having the above-described configuration, the plunger 21 is influenced by the magnetic force from the solenoid portion 20 and is located on the side opposite to the compression spring 63 through the spool 62, It is capable of moving back and forth in the direction (D1). Therefore, the force applied to the spool 62 from the plunger 21 and the force applied to the spool 62 from the compression spring 63 oppose each other, and the balance of these forces (i.e., the force of the plunger 21) (by the tip position), the position of the spool 62 in the first direction D1 is determined. The spool 62 shown in FIG. 4 is in contact with the plunger 21 and is disposed at a position closest to the solenoid portion 20 (that is, a position furthest from the first connection port P1). From this state, the drive unit 11 is driven by a control unit (not shown) to move the plunger 21 toward the spool 62, and the spool 62 is pressed and moved by the plunger 21, The compression spring 63 is compressed by movement of the spool 62. As a result, the positions of the second flow path C2 and the third flow path C3 of the spool 62 are changed with respect to the fifth flow path C5 and the sixth flow path C6. The connection state of the second flow path C2 and the third flow path C3 (that is, the flow path size of the flow path forming portion 25) can be changed.

In this way, by driving the spool 62 of the hydraulic part 12 by the plunger 21 of the driving part 11, the actuator A, the pump P, and the first flow path C1 of the tank T Connection and disconnection can be changed flexibly. Thereby, switching between supply and stop supply of hydraulic oil from the pump P to the first flow path C1, switching between supply and discharge of hydraulic oil between the first flow path C1 and the actuator A, It is possible to switch between discharging and stopping the discharge of pressure oil from the first flow path C1 to the tank T under electrical control.

FIG. 5 is a side view showing another example of the specific configuration of the solenoid valve 10. In FIG. 5, a cross section is shown of some of the components of the electromagnetic valve 10. Additionally, in FIG. 5, some of the components of the solenoid valve 10 are omitted from illustration. Among the elements constituting the electromagnetic valve 10 shown in FIG. 5, detailed descriptions of elements that are the same or similar to those shown in FIG. 4 will be omitted.

The configuration of the solenoid valve 10 shown in FIG. 5 is similar to that of the solenoid valve 10 shown in FIG. 4, but does not include the joint body 70 shown in FIG. 4. The first fastening portion 34 of the solenoid valve 10 shown in FIG. 5 is comprised of the valve body 60, and the first threaded portion 37 of the first fastening portion 34 has a female thread structure. The connection portion of the installation object that is screwed to the first thread portion 37 has a male thread structure.

The installation portion 13 in this example is comprised of the valve body 60, and the installation surface 13a is comprised of the end surface of the valve body 60. The first connection port P1 is comprised of a recessed portion of the end of the valve body 60, opens in the first direction D1 (particularly in the direction opposite to the drive unit 11), and is connected to the valve body 60. It is connected to the fourth flow path C4 and the first flow path C1 through a flow path. In a state where the installation object is fixed to the first fixing part 34, the first connection port P1 is connected to the port and flow path of the connection part of the installation object.

Additionally, the relationship between the drive of the plunger 21 and the flow path structure of the flow path forming portion 25 in FIG. 5 is the same as the relationship shown in FIG. 4.

FIG. 6 is a side view showing another example of a specific configuration of the solenoid valve 10. In FIG. 6, a cross section is shown of some of the components of the electromagnetic valve 10. Additionally, in FIG. 6, some of the components of the solenoid valve 10 are omitted from illustration. Among the elements constituting the electromagnetic valve 10 shown in FIG. 6, detailed descriptions of elements that are the same or similar to those shown in FIGS. 4 to 5 will be omitted.

The configuration of the solenoid valve 10 shown in FIG. 6 is similar to the configuration of the solenoid valve 10 shown in FIG. 4, but instead of the joint body 70 shown in FIG. 4, a first joint body 77 is used. and a second joint body (78). That is, the hydraulic unit 12 shown in FIG. 6 includes a valve body 60, a first joint body 77 fixedly installed on the valve body 60, and a first joint body 77 installed on the first joint body 77. It includes a second joint body (78).

The first joint body 77 is a tubular member extending in the first direction D1, and a flow path C extending in the first direction D1 penetrates the first joint body 77. The first joint body 77 includes a main body connection screw portion 72 located at one end, a fitting groove 79 located at the other end side, and a main body connection screw portion 72 and a fitting groove 79. It has a stopper portion 75 located between them. The main body connection thread portion 72 has a male thread structure. The fitting groove 79 has a concave shape into which the fitting claw 80 of the second joint body 78 can be inserted.

The second joint body 78 has a cylindrical shape and constitutes the first fastening portion 34. The second joint body 78 has a fitting hook 80 located at one end and a first screw portion 37 located at the other end. By fitting the fitting hook 80 into the fitting groove 79, the second joint body 78 is installed in the first joint body 77. Additionally, the second joint body 78 is provided so as to be rotatable relative to the first joint body 77 . The first connection port P1 is composed of a concave portion of the end of the second joint 78 (the lower end in Fig. 6), and is connected in the first direction D1 (particularly on the opposite side to the drive unit 11). direction) and is connected to the fourth flow path C4 and the first flow path C1 through the flow path C provided by the first joint body 77 and the valve body 60.

The installation portion 13 of this example is comprised of the first joint body 77, and the installation surface 13a is comprised of the end surface of the first joint body 77. Additionally, the installation portion 13 and the installation surface 13a do not necessarily need to be comprised of the first joint body 77. For example, as indicated by symbols "13'" and "13'a" in FIG. 6, the valve body 60 may be configured with an installation portion and an installation surface. Additionally, as indicated by the symbols “13”” and “13”a” in FIG. 6, the installation portion and the installation surface may be formed by the second joint body 78.

Additionally, the relationship between the drive of the plunger 21 and the flow path structure of the flow path forming portion 25 in FIG. 6 is the same as the relationship shown in FIGS. 4 and 5.

As described above, the drive unit 11 is a flow path (third flow path C3 in the example shown) directly or indirectly connected to the first connection port P1 depending on the excitation current applied to the solenoid part 20. The cross-sectional area (i.e., cross-sectional area of the flow path) of the confluence of another flow path (the sixth flow path C6 in the illustrated example) directly or indirectly connected to the second connection port P2 is changed. Likewise, the drive unit 11 is connected directly or indirectly to a flow path (second flow path C2 in the illustrated example) directly or indirectly connected to the first connection port P1 and to the third connection port P3. The cross-sectional area of the confluence of another flow path (the fifth flow path C5 in the example shown) is changed.

Additionally, the solenoid valve 10 is not limited to the structure shown in FIGS. 4 to 6. For example, the drive unit 11 is a confluence of a flow path connected to the first connection port (P1) and another flow path connected to the second connection port (P2) according to the excitation current applied to the solenoid part 20. , and the confluence of the flow path connected to the first connection port P1 and the other flow path connected to the third connection port P3. It is sufficient to change the cross-sectional area of at least one of them.

[Application example]

The electromagnetic valve 10 described above can be mounted on various devices (for example, hydraulic devices). For example, the direction change valve may be provided with the electromagnetic valve 10 described above. Additionally, construction machinery such as a hydraulic excavator or other work machinery may be equipped with a direction change valve including the electromagnetic valve 10 described above.

[Direction change valve]

FIG. 7 is a cross-sectional view showing an example of the direction change valve 90. The direction change valve 90 shown in FIG. 7 has a known structure. For example, by referring to Japanese Patent Application Laid-Open No. 08-170353, the specific structure of the direction change valve 90 shown in FIG. and operations can be easily understood. Therefore, in this specification, detailed description of the direction switching valve 90 shown in FIG. 7 is omitted.

In the direction change valve 90 shown in FIG. 7, the direction change spool 91 in the spool hole 96 of the valve block 95 (i.e., the left and right position in FIG. 7) changes the direction of the valve block 95. The flow and flow direction of the hydraulic oil in the passages of 95 (in particular, the first load passage 92 and the second load passage 93) change. For example, with the first load passage 92 and the second load passage 93 connected to a common hydraulic device (e.g., hydraulic motor, hydraulic piston, etc.), the valve block 95 By changing the position of the direction change spool 91, not only can the supply and discharge of hydraulic oil to the hydraulic machine be switched, but also the driving state of the hydraulic machine can be switched between forward drive and reverse drive.

The position of this direction change spool (91) is determined by the balance of pilot pressure applied to both ends of the direction change spool (91). A first pilot pressure introduction part 98 and a second pilot pressure introduction part 99 are provided in the valve block 95 of the illustrated direction change valve 90. Inside the first pilot pressure introduction portion 98, a drive elastic body 94 composed of a compression spring or the like is disposed. The drive elastic body 94 is compressed by receiving force from the first pilot pressure introduction portion 98 and the direction change spool 91. The pressure of the hydraulic oil supplied to the first pilot pressure introduction part 98 and the elastic force of the drive elastic body 94 are applied to one end of the direction change spool 91 (the right end in FIG. 7). The pressure of hydraulic oil supplied to the second pilot pressure inlet 99 is applied to the other end of the direction change spool 91 (the left end in Fig. 7).

Female threads are formed in the first pilot pressure introduction part 98 and the second pilot pressure introduction part 98, and at least one of the first pilot pressure introduction part 98 and the second pilot pressure introduction part 99 is shown, for example, in FIG. 4. It is possible to adjust the position of the direction change spool 91 by installing a solenoid valve 10 and electrically controlling the solenoid valve 10. That is, the pressure of the hydraulic oil supplied to the first pilot pressure introduction part 98 and/or the second pilot pressure introduction part 99 through the first connection port P1 of the solenoid valve 10 described above is applied to the direction change spool ( By using it as a pilot pressure to move 91), it is possible to arrange the direction change spool 91 in the spool hole 96 at a desired position. In addition, when the solenoid valve 10 is installed only on one of the first pilot pressure introduction part 98 and the second pilot pressure introduction part 99, normal piping is connected to the other introduction part where the solenoid valve 10 is not installed. Through this, it is possible to introduce pressure oil that provides pilot pressure.

In addition, the direction switching valve on which the above-described solenoid valve 10 can be mounted is not limited to the direction switching valve 90 shown in FIG. 7 . In addition, it is possible to mount the above-described solenoid valve 10 on hydraulic equipment and other equipment other than the direction change valve.

[Hydraulic Shovel]

FIG. 8 is an external view schematically showing a typical configuration example of the hydraulic excavator 110. The hydraulic excavator 110 generally includes a lower frame 144 equipped with a crawler, an upper frame 145 provided to pivot with respect to the lower frame 144, and a boom 147 installed on the upper frame 145. ), an arm 148 installed on the boom 147, and a bucket 149 installed on the arm 148. The hydraulic cylinders 167, 168, and 169 as actuators are hydraulic cylinders for the boom, arm, and bucket, and drive the boom 147, arm 148, and bucket 149, respectively. Rotational driving force from the swing motor 146 is transmitted to the upper frame 145 so that the upper frame 145 is rotated by the swing motor 146. Additionally, the crawler is driven by the travel motor 151 so that the hydraulic excavator 110 travels, and rotational driving force from the travel motor 151 is transmitted to the crawler of the lower frame 144.

In this hydraulic excavator 110, for example, the above-described former is placed at an appropriate location among the passages included in or connected to the hydraulic cylinders 167, 168, and 169, the swing motor 146, and/or the traveling motor 151. A direction change valve 90 including the valve 10 may be installed.

The present invention is not limited to the above-described embodiments and modifications. For example, various modifications may be made to each element of the above-described embodiments and modifications, and the embodiments and modifications may be partially combined. Additionally, the effects achieved by the present invention are not limited to the effects described above, and unique effects are exhibited depending on the specific configuration.

Claims (13)

a first fastening portion having a first connection port connected to a hydraulic device and capable of being attached to a connection portion of the hydraulic device;
a second fastening portion having a second connection port connected to a hydraulic power source and capable of being attached to the connection of the hydraulic power supply;
a third attachment portion having a third connection port connected to the tank and capable of being attached to the connection portion of the tank;
A driving unit that changes the cross-sectional area of a confluence of a flow path directly or indirectly connected to the first connection port and another flow path directly or indirectly connected to the second connection port by an exciting current applied to the solenoid unit,
Electronic valve. According to paragraph 1,
An electromagnetic valve, wherein the hydraulic device is a directional valve. According to paragraph 1,
An electromagnetic valve, wherein the hydraulic pressure source is a hydraulic pump. According to paragraph 1,
An electromagnetic valve, wherein the second connection port is perpendicular to the first connection port. According to paragraph 1,
The first fixing portion has a screw structure. According to paragraph 1,
The solenoid valve is where the first connection port is located on the opposite side of the drive unit through the installation surface of the installation unit. According to paragraph 1,
The electromagnetic valve wherein the first connection port is located on the same side as the drive unit with respect to the installation surface of the installation unit. According to paragraph 1,
The electromagnetic valve wherein the second connection port is located on the same side as the drive unit with respect to the installation surface of the installation unit. According to paragraph 1,
The solenoid valve wherein the third connection port is located on the same side as the drive unit with respect to the installation surface of the installation unit. a first fastening portion having a first connection port connected to a hydraulic device and capable of being attached to a connection portion of the hydraulic device;
a second fastening portion having a second connection port connected to a hydraulic power source and capable of being attached to the connection of the hydraulic power supply;
a third attachment portion having a third connection port connected to the tank and capable of being attached to the connection portion of the tank;
The confluence of a flow path directly or indirectly connected to the first connection port and another flow path directly or indirectly connected to the second connection port, and directly to the first connection port by the excitation current applied to the solenoid portion. or a driving unit that changes the cross-sectional area of at least one of the confluence of an indirectly connected flow path and another flow path directly or indirectly connected to the third connection port,
Electronic valve. A direction switching valve provided with the electromagnetic valve according to any one of claims 1 to 10. A construction machine provided with the direction change valve according to claim 11. delete