JP4131949B2 - Solenoid valve device - Google Patents

Description

  The present invention relates to an electromagnetic valve device mounted on a construction machine represented by, for example, a hydraulic excavator or a hydraulic crane.

  With recent computerization, for example, control systems for hydraulic control devices used in, for example, hydraulic excavators and hydraulic cranes have become more sophisticated, and the solenoid valves used in this control system have high versatility for a wide variety of external devices. Is now required. Normally, a solenoid valve is provided with a connector for connecting wiring from an external device to a terminal built in the solenoid unit. The connector is connected to a terminal of an electromagnetic actuator built in the solenoid unit, and an electrical signal from an external device connected via the connector is transmitted to a so-called electromagnetic actuator. The connector used for such a solenoid valve is generally integrally formed with the solenoid part as shown in, for example, Patent Document 1, Patent Document 2 and the like, which are connected to the solenoid part via a lead wire. There is a thing.

JP-A-7-169527

JP-A-6-241340

However, the conventional electromagnetic valve device has the following problems.
For example, in a solenoid valve in which a connector is integrally formed with a solenoid portion, the connector cannot be easily replaced. For this reason, the connector shape of the external device to be connected or the external device itself must be selected according to the connector shape of the solenoid valve, or the solenoid valve itself must be replaced according to the connector shape of the external device to be connected. There is a little versatility for a wide variety of connectors. Further, since the connector is fixed to the solenoid portion, the orientation of the connector is uniquely determined by the installation state of the solenoid valve, and the wiring layout is greatly restricted.

  On the other hand, in the solenoid valve in which the connector is connected to the solenoid part via the lead wire, the replacement of the connector is relatively easy, and in terms of versatility and wiring layout, compared to the one in which the connector is integrally molded. Are better. However, as described above, hydraulic control devices for construction machinery in recent years have been highly systematized, and a large number of solenoid valves provided corresponding to the respective operating directions of the hydraulic actuators are connected to each other, and one electromagnetic It has become common to configure valve units.

  As described above, when the solenoid valve unit is configured by the solenoid valves having the connectors connected via the lead wires, the connectors of the solenoid valves are collectively arranged in one place in consideration of convenience for wiring with each external device. In many cases, however, the distance to the collective position of the connector differs for each solenoid valve, so the length of the lead wire connected to the connector must be changed for each solenoid valve. However, as long as each connector of the solenoid valve unit is consolidated in one place, it is sufficient to unify the lengths of the lead wires of the other solenoid valves for the solenoid valve farthest from the connector aggregation position. The lead wire of the solenoid valve, which is relatively close to the connector aggregation position, causes a surplus longer than necessary, and the wiring layout becomes complicated.

  An object of the present invention is to provide a solenoid valve device capable of ensuring versatility that can be applied to a wide variety of external devices and simplifying the layout of lead wires.

(1) In order to achieve the above object, the present invention provides a casing, an electromagnetic valve coil covered with the casing, a plunger that reciprocates in the axial direction by electromagnetic force from the electromagnetic valve coil, In a solenoid valve device comprising a control spool that moves in the axial direction with the operation and adjusts the output pressure of hydraulic oil, a terminal connected to the terminal of the solenoid valve coil, a lead wire connected to the terminal, connected to said lead wire, and a connector to be connected to the solenoid valve coil wires from the external device via the lead wires and the terminals, and the connector fixing bracket for mounting the connector, the connector fixing bracket before Symbol casing and mounting means for mounting, as well as accommodating the plunger, cylinder having a threaded portion at an end portion projecting from the end surface of the casing The mounting means is adapted to be screwed into a thread portion of the cylinder, and the connector fixing bracket has a hole through which the cylinder is passed, and the cylinder is passed through the hole. It is clamped and fixed between the attachment means and the casing.

  In the present invention, the connector is fixed to the casing via a connector fixing bracket. Therefore, the distance from the connector to the terminal of the solenoid valve coil depends on the size and size of the connector fixing bracket. Therefore, even when a plurality of electromagnetic valve devices are assembled to form an electromagnetic valve unit, if the similarly formed connector fixing brackets are used in a unified manner, the distance between the connector and the terminal becomes almost the same. The length of the lead wire connecting the connector and the terminal can be unified by each solenoid valve device, and the layout of the lead wire wiring can be simplified. At the same time, in the present invention, since the connector is attached independently of the casing through the lead wire, the connector can be easily replaced. Therefore, a connector having a shape corresponding to the external device to be connected and the connector of the harness wiring can be selected and attached, and versatility that can be applied to a wide variety of external devices can be sufficiently ensured.

( 2 ) In the above ( 1 ), preferably, the connector fixing bracket is rotatable about the cylinder by loosening the attachment means.

  ADVANTAGE OF THE INVENTION According to this invention, while ensuring the versatility which can respond to various external apparatuses, the layout of a lead wire can be simplified.

Hereinafter, embodiments of a solenoid valve device of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing the overall configuration of an embodiment of the electromagnetic valve device of the present invention, and FIG. 2 is a cross-sectional view showing the internal structure thereof.
1 and 2, the solenoid valve device 1 according to the present embodiment is a three-port, two-position solenoid proportional valve, and applies pilot pressure to the drive unit of the corresponding control valve 2 that supplies pressure oil to the hydraulic actuator. It comes to supply. In addition, the electromagnetic valve device 1 includes a plurality of electromagnetic valve units, each of which is schematically configured by an electromagnetic valve main body portion 3, a solenoid portion 4, and a connector portion 5. Yes. In this example, as shown in FIG. 1, a plurality of control valves 2 are connected to constitute one control valve unit.

  As shown in FIG. 2, the electromagnetic valve main body 3 includes a body 6 forming the main body of the electromagnetic valve main body 3, a control spool 7 provided inside the body 6 so as to be capable of reciprocating in the axial direction, and this control. And a spring 8 for urging the spool 7.

  The body 6 has a pump port (supply passage) 9, a control valve port (output passage) 10, and a tank port (discharge passage) 11. The body 6 is provided with a spool housing chamber 12 for housing the control spool 7. The spool housing chamber 12 includes a small diameter portion 13, a large diameter portion 14 having a diameter larger than the small diameter portion 13, and a connection portion 15 that connects the small diameter portion 13 and the large diameter portion 14. One end of the pump port 9, the control valve port 10, and the tank port 11 is connected to the large diameter portion 14, the connection portion 15, and the small diameter portion 13, respectively. On the other hand, the other end of the pump port (hereinafter referred to as “P port”) 9 is connected to, for example, a pilot pump 16 driven by an engine of a construction machine on which the electromagnetic valve device is mounted. Yes. The other end of the control valve port (hereinafter referred to as “C port”) 10 is connected to the drive unit 17 of the corresponding control valve 2. Furthermore, the other end of the tank port (hereinafter referred to as “T port”) 11 is connected to a tank 18 that stores hydraulic oil.

  The control spool 7 is inserted into the spool accommodating chamber 12 and reciprocates in the spool accommodating chamber 12 in the axial direction. One end thereof abuts against a plunger 27 (described later), and the other end is urged by a spring 8 provided in the small diameter portion 13 of the spool housing chamber 12. The control spool 7 has a smaller diameter than the inner diameter of the spool housing chamber 12, and has a gap between the outer peripheral portion and the inner wall of the spool housing chamber 12, while the seal portion 19 and the pressure receiving portion are substantially inscribed in the large diameter portion 14. 20 and a pressure receiving portion 21 that is substantially inscribed in the small diameter portion 13.

  The seal part 19 is located on the solenoid part 4 side, that is, on the left side in FIG. 2 with respect to the installation position of the P port 9, and prevents the hydraulic oil from entering the solenoid part 4. The pressure receiving portions 20 and 21 are located at the boundary between the large diameter portion 14 and the connection portion 15 and at the boundary between the connection portion 15 and the small diameter portion 13, respectively. The pressure receiving portion 20 is provided with a communicating portion 22 for communicating the P port 9 and the C port 10 at a position where it faces the connecting portion 15 from the large diameter portion 14 side. Similarly, the pressure receiving portion 21 is provided with a communicating portion 23 for communicating the C port 10 and the T port 11 at a position where it faces the connecting portion 15 from the small diameter portion 13 side. The distance between the communication portions 20 and 21 is substantially the same as or slightly larger than the axial length of the connection portion 15.

  Thus, in the state shown in FIG. 2, the P port 9, C port 10 and T port 11 are blocked by the pressure receiving portions 20 and 21, respectively. However, when the control spool 7 moves to the right in FIG. The communication part 22 faces the connection part 15, and the P port 9 and the C port 10 communicate with each other via the communication part 22. On the contrary, when the control spool 7 moves to the left side in FIG. 2, the communication part 23 faces the connection part 15, and the C port 10 and the T port 11 communicate with each other via the communication part 23.

  Next, the solenoid unit 4 will be described. The solenoid unit 4 includes a casing 25 forming a main body, a cylinder 26 inserted through the casing 25 and screwed into the body 6 of the electromagnetic valve main body unit 3, and the cylinder. 26, a plunger 27 provided so as to be capable of reciprocating (sliding) in the axial direction, a solenoid valve coil 28 covered with a casing 25 and wound around the outer periphery of the cylinder 26 with a gap, A terminal 29 connected to the end is provided.

A male threaded portion 30 is provided at one end of the cylinder 26 (left end in FIG. 2). The male threaded portion 30 protrudes from the end surface of the casing 25 by a predetermined length, and the male threaded portion 30 includes a nut. 31 is screwed together. On the other hand, a male threaded portion 32 is provided in the vicinity of the other end (right end in FIG. 2) of the cylinder 26. The male threaded portion 32 is formed in the body 6 so as to be continuous with the spool housing chamber 12 described above. It is designed to be tightened into the provided screw hole. Thereby, the cylinder 26 is fixed to the body 6 of the electromagnetic valve main body 3, and the casing 25 inserted through the cylinder 26 is fixed to the electromagnetic valve main body 3 by the tightening force of the nut 31.
A seal ring 33 is attached to the other end of the cylinder 26 to prevent hydraulic oil from the P port 9 from entering the solenoid portion 4 side.

  Inside the cylinder 27, there are a plunger accommodating chamber 34 for accommodating the plunger 27, and a spool insertion part 35 for inserting the control spool 7. The plunger accommodating chamber 34 and the spool insertion portion 35 communicate with each other, and the tip end portion of the control spool 7 faces the plunger accommodating chamber 34. The length of the plunger 7 is short with respect to the plunger accommodating chamber 34, and the end surface on the other end side (the right end side in FIG. 2) is in contact with the tip end of the control spool 7. On the other hand, one side (left side in FIG. 2) of the plunger accommodating chamber 34 is closed by a cap 36. The cap 36 is fitted to the cylinder 26, and foreign matter is prevented from entering the plunger accommodating chamber 32 by a seal ring 37 provided between the cap 36 and the cap 26.

  The connector part 5 will be described. The connector part 5 includes a connector 38 that is a connection part for wiring 50 (see FIG. 1) from an external device, and a connector fixing bracket 39 for attaching the connector 38. .

  The connector fixing bracket 39 has a hole for inserting the cylinder 26, and the nut 31 described above together with the solenoid unit 4 in a state where the hole is passed through the male screw part 30 of the cylinder 26 protruding from the casing 25. It is tightened with. That is, the nut 31 serves as an attaching means for attaching the connector fixing bracket 39 to the casing 25, and the connector fixing bracket 39 is sandwiched and fixed between the nut 31 and the casing 25. Further, if the nut 31 is loosened, the connector fixing bracket 39 can be rotated about the hole through which the casing 27 is passed, and its mounting direction can be adjusted.

  The connector 38 is fixed to the connector fixing bracket 39 by, for example, a screw (not shown) or an adhesive. A lead wire 40 connected to the terminal 29 is fitted and attached to the connector 38, whereby the connector 38 is connected to the electromagnetic valve coil 28 via the lead wire 40 and the terminal 29.

Next, the operation and action of the electromagnetic valve device of the present invention will be described.
For example, when an electric signal output from a corresponding device such as an operation lever is energized to the electromagnetic valve coil 28 via the harness wiring 50, the connector 38, the lead wire 40, and the terminal 29 from the external device, the electromagnetic valve An electromagnetic force that acts to move the plunger 27 toward the control spool 7 is generated in the coil 28. Accordingly, the control spool 7 is also moved to the right side in FIG. 2 by being pushed by the plunger 27, and as a result, the P port 9 is connected to the C port 10 through the communication portion 22. At this time, if the pressure of the C port 10 rises due to the hydraulic oil flowing in from the P port 9, the pressure receiving portion 20 has a larger pressure receiving area than the pressure receiving portion 21, so the control spool 7 is pushed back toward the plunger 27. A force (hydraulic reaction force) is generated, and the control spool 7 is positioned where the hydraulic reaction force balances with the electromagnetic force pushing the plunger 27. As a result, hydraulic oil (pilot pressure) having a pressure corresponding to the magnitude of the electrical signal (input current) output from the corresponding device is output to the drive unit 17 of the corresponding control valve 2 via the C port 10. The Then, the corresponding hydraulic actuator is driven according to the supply direction and flow rate (or pressure) of the pressure oil from the control valve 2 that operates according to the output pressure of the hydraulic oil.

Here, FIG. 3 shows a cross-sectional view of the internal configuration of a comparative example with the electromagnetic valve device of the present invention in correspondence with FIG. However, the same parts as those in FIG. In FIG. 3, connection devices such as the control valve 2, the pump 16, and the tank 18 are not shown.
In the electromagnetic valve device 1A of the comparative example shown in FIG. 3, the connector fixing bracket 39 is omitted, and the connector 38 is only connected to the solenoid unit 4 via the lead wire 40, and particularly the solenoid unit. It is not fixed to 4. Generally, when a solenoid valve unit is configured by collecting a plurality of such solenoid valve devices 1A, the connectors of the solenoid valves may be centrally arranged in one place in consideration of the convenience of wiring to external devices to be connected. Many. However, since the distance to the collective position of the connector 38 is different in each electromagnetic valve device 1A, the length of the lead wire 40 connected to the connector 38 must be changed in each electromagnetic valve device 1A. However, as long as each connector 38 is integrated in one place, it is sufficient to unify the lengths of the lead wires 40 of the other electromagnetic valve devices 1A in the electromagnetic valve device 1A farthest from the integrated position of the connectors 38. In this case, the lead wire 40 of the electromagnetic valve device 1A that is relatively close to the collective position of the connector 38 causes an extra portion longer than necessary, and the wiring layout becomes complicated.

  On the other hand, in the electromagnetic valve device of the present embodiment, the connector 38 is fixed to the casing 25 of the solenoid unit 4 via the connector fixing bracket 39 as described above. Therefore, the distance from the connector 38 to the terminal 29 of the electromagnetic valve coil 28 depends on the size and size of the connector fixing bracket 39. Therefore, even when a plurality of the electromagnetic valve devices 1 are collected to form an electromagnetic valve unit, the distance between the connector 38 and the terminal 29 becomes substantially the same if the similarly shaped connector fixing bracket 39 is used. The lengths of the lead wires 40 connecting the connectors 38 and the terminals 29 are the same in each solenoid valve device. Thereby, the layout of the lead wire can be simplified.

  In addition, in the solenoid valve in which the conventional connector part is integrally formed with the solenoid part, it is difficult to replace the connector, so it can be connected only to external devices with harness wiring of a specific connector shape. There was a poor side.

  In contrast, in the present embodiment, since the connector 38 is attached independently of the solenoid portion 4 via the lead wire 40, the connector 38 can be easily replaced. If the connector 38 is attached to the connector fixing bracket 39 with screws or the like, the replacement of the connector 38 can be further facilitated. Even if the connector 38 is fixed to the connector fixing bracket 39 with an adhesive or the like, the connector fixing bracket 39 is fastened to the casing 25 by the nut 31. Therefore, the connector fixing bracket 39 can be removed and easily replaced. can do. Therefore, since the connector 38 having a shape corresponding to the external device to be connected and the connector of the harness wiring 50 can be selected and attached to the lead wire 40, versatility that can be used for various external devices is sufficiently ensured. Can do.

  Further, when the connector fixing bracket 39 is not provided as shown in FIG. 3, the connector 38 and the solenoid unit 4 have vibration frequencies having different phases due to vibrations of the engine of the machine on which the electromagnetic valve device 1A is mounted, vibrations of the vehicle body, and the like. It will vibrate. As a result, it cannot be said that depending on the tension of the lead wire 40, there is no possibility of causing a failure due to disconnection of the lead wire 40 or disconnection of the connector 38 and the connector of the external harness wiring 50. Therefore, in the electromagnetic valve device 1A in which the connector 38 is simply connected to the solenoid portion 4 via the lead wire 40, generally, as shown in FIG. In addition, the lead wire 40 is used together with the solenoid portion 4 by the band 41.

  On the other hand, in the solenoid valve device 1 of the present invention, the connector 38 is attached to the solenoid unit 4 via the connector fixing bracket 39, so that the connector 38 and the connector fixing bracket 39 vibrate at substantially the same in-phase vibration frequency. . For this reason, it is possible to suppress the occurrence of failure due to disconnection of the lead wire 40 connecting the two or disconnection of the connector 38 and the connector of the external harness wiring 50, thereby ensuring high reliability. be able to.

  In addition, when the connector is integrally formed with the solenoid part, if the connector terminal is damaged, the connector part must be replaced, so the cost for repair becomes relatively high, but in this embodiment, Since the connector 38 can be easily replaced, there is an advantage that it is possible to cope with terminal breakage at low cost. Further, when the connector is integrally formed, the direction of the connector is uniquely determined by the attachment of the electromagnetic valve device main body. However, in this embodiment, the connector fixing bracket 39 to which the connector 38 is attached loosens the nut 31. Therefore, since it is possible to rotate 360 degrees around the cylinder 26, the degree of freedom of the wiring layout on the connected device side can be improved accordingly. Furthermore, if the connector is integrally formed, a mold for manufacturing the connector is required, and thus the manufacturing cost increases accordingly. In the case of the present embodiment, a commercially available connector is used according to the connected device side. Since it only has to be attached, it is also an advantage that the production cost can be reduced.

  As described above, in the present embodiment, high versatility in terms of connection with a wide variety of devices, low manufacturing cost, simplification of lead wire layout, freedom of connector mounting angle, connector The advantages of both the connector-integrated type, such as the low cost required for repairing damaged terminals and the reduction of malfunctions due to disconnection of the lead wire, and the simple connection of the connector to the solenoid with the lead wire, Can be obtained effectively.

  In the above description, the shape of the connector fixing bracket 39 has not been described in detail. In FIG. 2, the attachment portion of the connector 38 is formed in a single step so as to extend from the end face of the casing 25 in the outer peripheral direction and away from the side opposite to the solenoid valve main body portion 3. The design of the shape of the bracket 39 can be changed as appropriate. For example, the attachment portion of the connector 38 may be formed so as to approach the electromagnetic valve main body portion 3 side, or the connector fixing bracket 39 itself may extend in the axial direction instead of the outer peripheral direction of the casing 25. In short, the shape of the connector fixing bracket 39 is not particularly limited, and the design may be changed as appropriate so that the connector 38 can be attached at a preferred position and angle with respect to the wiring layout with the external device to be connected. Even when the design of the connector fixing bracket 39 is changed as described above, the same effect can be obtained.

  Further, although the nut 31 has been illustrated and described as the attachment means for attaching the connector fixing bracket 39 to the casing 25, it is not necessary to be limited to this. For example, a female screw portion may be provided on the cylinder 27 side and a bolt may be screwed into the cylinder 27 through a hole in the connector fixing bracket 39. Further, when it is not necessary to rotate the connector fixing bracket 39 so that the mounting direction can be adjusted, the connector fixing bracket 39 may be fixed to the casing 25 by welding, an adhesive, or the like, for example, instead of fastening with bolts or nuts. In these cases, the same effect is obtained.

It is a perspective view showing the whole structure of one Embodiment of the solenoid valve apparatus of this invention. It is sectional drawing showing the internal structure of one Embodiment of the solenoid valve apparatus of this invention. It is sectional drawing showing the internal structure of one comparative example with the solenoid valve apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solenoid valve apparatus 7 Control spool 25 Casing 26 Cylinder 27 Plunger 28 Solenoid valve coil 29 Terminal 30 Male thread part (screw part)
31 Nut (mounting means)
38 Connector 39 Connector fixing bracket 40 Lead wire 50 Wiring

Claims (2)

A casing, an electromagnetic valve coil covered with the casing, a plunger that reciprocates in the axial direction by electromagnetic force from the electromagnetic valve coil, and an axial movement that moves in accordance with the operation of the plunger to reduce the output pressure of the hydraulic oil In a solenoid valve device having a control spool to be adjusted,
A terminal connected to the end of the solenoid valve coil;
A lead wire connected to this terminal,
A connector connected to the lead wire, and connecting a wire from an external device to the solenoid valve coil via the lead wire and the terminal;
A connector fixing bracket for attaching this connector;
Mounting means for attaching the connector fixing bracket to the casing;
Accommodates the plunger, a cylinder having a threaded portion at an end portion projecting from the end face of the casing,
Said mounting means is adapted to be screwed into the threaded portion of the cylinder, before Symbol connector fixing bracket has a hole through which said cylinder, in a state in which through the cylinder into the hole, the mounting means A solenoid valve device that is sandwiched and fixed between the casing and the casing. 2. The electromagnetic valve device according to claim 1 , wherein the connector fixing bracket is rotatable about the cylinder by loosening the attachment means.

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