JPH0345270B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solenoid valve for switching oil or controlling opening and closing of oil in various hydraulic machines.

The purpose of this is to reduce the protrusion dimension from the mechanical device when it is attached to the mechanical device, to make effective use of the space on the side of the mechanical device, and to reduce the cylindrical shape relative to the valve body. To provide a solenoid valve which can easily check for looseness of the valve and, if the valve is loosened, can be easily tightened as is.

The drawings showing the embodiments of the present application will be described below. In Figures 1 to 4, 1 is the valve body, 2
are solenoids, which are examples of well-known switching valves and wet armature solenoids, respectively. In the valve body 1, 3 is a valve body, and an oil passage 4 is formed inside the valve body.
As is well known, ports A, B, pressure port P, tank port T, etc. connected to the controlled device are communicated with each other. 5 is a spool, which is provided so as to be able to move forward and backward in the direction of the arrow. In FIG. 1, the upper half of the spool 5 shows the normal state (returning state) and the lower half shows the switching normal state (operating state). The same applies to the movable core and valve pin described later. 6 is a closing body which is connected to the body 3 by a retaining ring 6a.
It is attached to. A spool return spring 7 is configured to press the spool 5. In the spool 5, reference numerals 8 and 9 indicate communication holes, and reference numeral 10 indicates a communication groove, which are configured to allow the flow of the controlled fluid (oil). Next, 11 is the mounting bolt,
It is for attaching the valve body 3 to various mechanical devices 13, and is inserted through a through hole 12 for attachment made in the valve body 3. The body 3 is attached to the mechanical device 1 using the through hole 12 and the bolt 11.
3, ports A, B,
P and T are ports A', B', P' of the device 13, respectively;
Connects to T′. Reference numeral 14 indicates a screw hole formed in one surface of the valve body 3 on the side in which the spool 5 moves forward and backward.

Next, in the solenoid 2, reference numeral 15 denotes a hollow cylindrical body, which includes a fixed iron core 16 formed of a magnetic material and screwed onto the valve body 3, and a fixed iron core 16.
It is formed into a hollow shape by a cylindrical element 17 welded to the cylindrical element 6, a cylindrical element 18 welded to the cylindrical element 17, and a closure body 19 welded to the cylindrical element 18. As the cylindrical element 17, a pipe made of a non-magnetic material is used, and as the cylindrical element 18, a pipe made of a magnetic material is used. In the cylindrical body 15, reference numeral 41 denotes a threaded portion formed integrally with the fixed iron core 16, which can be threaded into the threaded hole 14. Reference numeral 42 denotes a collar, which is formed so as to come into contact with the above-mentioned one surface of the valve body 3 and press the O-ring 43 in that state. Reference numeral 22 indicates a through hole formed in the closing body 19, and 23 indicates a manual operation push pin provided in the through hole 22 so as to be able to be pushed into the working chamber 21. 4
4 is a fixing screw portion provided around the closure body 19;
Reference numeral 45 denotes a mounting portion formed around the axis of the closure body 19, and is formed in a concave shape so that a hexagonal wrench as an example of a fastener can be fitted therein.
One end of the through hole 22 for inserting the push pin is opened. 46 is a guide cylinder integrally formed with the closure body 19. Reference numeral 20 denotes a movable iron core, which is disposed within a working chamber 21 formed inside the cylindrical body 15 so as to be movable in the direction of the arrow. Further, on the circumferential surface of the movable iron core 20, an oil circulation groove 20a extending over the entire length in the advancing and retreating direction,
20a is formed. Reference numeral 47 denotes a recess, which is formed around the axial center position of the movable iron core 20 so that the guide tube 46 and one end of the push pin 23 can enter therein.

Next, the cylindrical electromagnet body disposed on the outer peripheral side of the cylindrical body 15 will be explained. 24 is a cylindrical coil, 24a is its lead wire, and 25 is a yoke, which is configured to form a magnetic path so that the magnetic flux generated by the coil 24 passes through the fixed iron core 16 and the movable iron core 20. ing. 26 is a rubber bushing. Reference numeral 27 denotes a case body of the solenoid 2, which is formed by molding plastic with the coil 24, yoke 25, and bushing 26 embedded therein. Incidentally, this may have a structure in which the housing is formed of metal as usual, and each member such as the coil 24 is inserted inside the housing. A valve pin 28 transmits the operating force of the movable core 20 to the spool 5, and is inserted into a through hole 16a formed in the fixed core 16 so as to be able to move forward and backward.

Next, a description will be given of the fixing portion 30 that is adapted to tighten the electromagnet body to the valve body 1. Reference numeral 33 denotes a fastener, which is manufactured into an annular shape by molding a synthetic resin material, and is screwed into the threaded portion 44 in a detachable manner. The pressing portion 35 at the tip is formed in an annular shape so as to face the end surface of the case body 27 . Further, the outer circumferential surface of the fastener 33 has many irregularities formed therein so that it can be easily gripped by hand.

Next, the assembly of the solenoid valve having the above structure will be explained. First, the hollow cylindrical body 15 containing the movable iron core 20, push pin 23, etc. is moved to the fourth
Attach it to the valve body 3 as shown in the figure. In this case, the cylindrical body 15 is grasped by hand and the threaded portion 41 is threaded into the screw hole 14. And the final tightening is done in the fourth step.
As shown in the figure, one end of a wrench 50 is fitted into the mounting portion 45 and the wrench is rotated in the direction of the arrow to tighten the cylindrical body 15 to the valve body 3. After that, the electromagnet body is placed on the outer circumferential side of the cylindrical body. Next, attach the fastener 33 to the threaded part 4.
4 and tighten this fastener 33 until the pressing part 35 presses the case body 27. This completes the solenoid valve assembly work. In the solenoid valve completed as described above, when the coil 24 is not energized, the movable core 20 is in the state shown in the upper half of FIG. The situation is as shown in the upper half of the figure. In this state, port P and port A are in communication, and port B and port T are in communication.
Therefore, fluid supplied to port P is sent to port A through oil passage 4, and fluid returning to port B is sent to port T through oil passage 4.

Next, when the coil 24 is energized via the lead wire 24a, the magnetic flux generated by the coil reaches the movable core 20, and the movable core 20 is brought into a state as shown in the lower half of FIG. Move towards 16 by suction. This movement is transmitted to the spool 5 via the valve pin 28, and the spool 5 moves to the state shown in the lower half of FIG. In this state, ports P and B communicate through the oil passage 4, and ports A and T communicate with each other through the communication holes 9 and 8.
communicate via. Therefore, fluid sent to port P is sent to port B, and fluid returning to port A is sent to port T.

Next, when the above current is cut off, the spool 5 and the movable iron core 2
0 is returned to the normal position by the biasing force of the spring 7.

When operating the movable core 20 by the magnetic flux generated by the coil 24 as described above, since the yoke 25 is disposed on the outer circumference side of the movable core 20, the magnetic flux due to the coil 24 is mainly applied to the outer circumference side of the movable core 20. Go through the part. Therefore, even if a recess 47 is formed around the axis, the recess 47 has almost no effect on the magnetic properties of the movable core 2.
0 is attracted toward the fixed iron core 16 with a sufficiently large force.

Further, when the magnetic flux from the coil 24 is applied to the movable iron core 20 to operate it as described above, the side surface of the collar 42 on the side opposite to the valve body is in close contact with the yoke 25 as shown in FIG. Since the gap between the outer peripheral surface of the yoke 42 and the inner peripheral surface of the yoke 25 is extremely small as shown in FIG. 3, the magnetic resistance between the yoke 25 and the fixed iron core 16 is extremely small. Therefore, the coil 24
can be efficiently applied to the movable core 20 to cause the movable core to operate as described above.

In addition, when switching the fluid as described above, the fluid flows into the working chamber 2 through the circulation groove 10 and the through hole 16a.
It also flows into 1. Therefore, the pressure balance between the movable iron core 20, the valve pin 28, and the spool 5 in the left-right direction in FIG. 1 is always maintained.

Next, if you want to manually operate spool 5,
An operating rod for manually operating the push pin 23 is connected to the push pin 23 via the mounting portion 45,
Push the push pin 23 to the right in FIG. 1 using the operating rod. As a result, the movable iron core 20,
The valve pin 28 and spool 5 can each move to the right to achieve their purpose.

Next, the mounting portion 45 is not limited to a shape that can fit a hexagonal wrench as described above;
If a fastener with a rectangular or triangular cross section is used, the fastener may be formed into a corresponding shape. Further, as shown in FIG. 5, fitting holes 48 and 48 are respectively provided on the outer circumferential side of the through hole 22 as mounting portions, and two pins corresponding to the fitting holes 48 and 48 are provided in the fastener. may be provided, and the pins of the fastener may be fitted into the fitting holes 48, 48 to perform the tightening work as described above.

As described above, in this invention, the coil 24
The movable iron core 20 is moved forward and backward by turning on and off power to the spool 5, and the spool 5 is moved forward and backward, thereby achieving the effect of performing a well-known valve operation.

Furthermore, since the mounting portion 45 of the fastener in the cylindrical body 15 is recessed, the dimension of protrusion from the valve body 1 is short enough to accommodate the coil 24 and its fastener 33. Sufficient (as shown in Fig. 6, the protruding dimension L of the wrench hanging part 60 for hanging a wrench for tightening the cylindrical body 15f on the valve body 1f)
), it is possible to reduce the protrusion dimension from the mechanical device when it is attached to the mechanical device, and there is an effect that the space near the mechanical device can be used effectively.

Furthermore, in the case of maintenance or inspection in the above-mentioned installed state, when checking for loosening of the tightening of the cylindrical body 15 to the valve body 1, attach a fastener to the mounting portion 45 exposed on the end surface of the cylindrical body 15. Looseness can be checked simply by rotating the cylindrical body 15 through the
Furthermore, if the bolt is loose, it can be retightened using the fastener, which has the effect of simplifying maintenance and inspection.

Furthermore, as described above, the mounting portion 4 is attached to the end surface of the cylindrical body 15.
5, it is a concave part that allows the fastener to be attached and detached freely, so when you want to manually operate the movable core 20, you can move the operating rod for manual operation to the push pin 23 without any hindrance caused by the presence of the mounting part 45 for attaching the fastener. through the push pin 23 to the movable iron core 2.
Another feature is that 0 can be manually operated at will.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view, FIG. 2 is a left side view of FIG. A perspective view showing the tightened state, FIG. 5 is a view showing a different example of the mounting part (view from the same direction as FIG. 2),
FIG. 6 is a perspective view of a conventional cylindrical body. DESCRIPTION OF SYMBOLS 1... Valve body, 5... Spool, 15... Cylindrical body, 41... Threaded part, 20... Movable iron core, 23...
... Push pin, 24 ... Coil, 33 ... Fastener, 45 ... Mounting part.

Claims (1)

[Claims] 1. A valve body configured to be able to be attached to a mechanical device and having a spool movably moved forward and backward therein;
One end is provided with a threaded part that is screwed onto one surface of the valve body on the side in which the spool advances and retreats, and the other end is closed and has a hollow interior, into which the spool can be moved forward and backward. A hollow cylindrical body that includes a movable iron core that is actuated so that it can move forward and backward, and a coil that is disposed around the valve body side portion of the cylindrical body so as to apply magnetic flux to the movable iron core and cause it to move forward and backward. and a fastener attached around a portion of the cylindrical body opposite to the valve body so as to tighten the coil to the valve body; In the above-mentioned solenoid valve, a push pin for manual operation is inserted through the movable iron core so that one end thereof is exposed on the end surface of the cylindrical body and the other end is opposed to the movable iron core, and can freely move forward and backward in the forward and backward direction of the movable iron core. A solenoid valve characterized in that the end face of the cylindrical body is recessed with a mounting portion to which a fastener for fastening the cylindrical body to the valve body can be detachably mounted.