JP5453828B2 - solenoid valve - Google Patents

Description

  According to the present invention, a spool valve that is pressed in one direction by electromagnetic thrust generated in the solenoid part is fitted into a sleeve hole of the valve body provided with a solenoid part at one end, and a mounting hole formed at the other end of the valve body. The present invention relates to an electromagnetic valve in which a spring member for urging the spool valve in a direction opposite to the electromagnetic thrust is provided between a fixed adjustment plug and the spool valve.

Conventionally, in this type of electromagnetic valve, a female screw provided on the inner periphery of the end portion of the sleeve hole into which the spool valve is slidably inserted, and a receptacle formed with a male screw to be engaged with the female screw, Fixing means for fixing the position of the stopper from the outside, and the fixing means is provided with a thin protruding portion provided with a female screw on the inner periphery connected to the end of the valve sleeve, and the female screw is provided with a male screw. The receptacle is provided with a screw, and after adjusting the position of the receptacle, the protruding portion is fixed by caulking (see, for example, Patent Document 1).
Conventionally, in this type of solenoid valve, the adjustment plug is screwed into the mounting hole of the valve body, and the set load of the valve spring is adjusted by the screwing depth. It is known that the valve body is fixed by caulking from the outside (see, for example, Patent Document 1).
In addition, the adjustment plug formed in the bottomed thin cylindrical shape is press-fitted into the mounting hole of the valve body, the set load of the valve spring is adjusted by the press-fitting depth, and the press-fitting between the adjustment plug and the mounting hole after the press-fitting is performed. A method is known in which concave and convex portions that are intimately bonded to each other are formed and fixed by caulking (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 2-129848 Japanese Patent No. 3160747

However, in the solenoid valve as described in Patent Document 1, it is indispensable to fix the screwing portion of the adjusting plug, and at the time of the caulking, the adjusting plug is pivoted by a minute gap in the screwing portion. Some displacement in the direction may cause the set load of the adjusted valve spring to be distorted. Furthermore, since a screw part is formed in the adjustment plug, the cost increases.
In addition, in the electromagnetic valve as described in Patent Document 2, since a caulking load is applied to the adjustment plug after adjusting the set load of the valve spring, for example, a slight displacement of the adjustment plug, unintentional deformation, deflection, etc. The error cannot be ignored.
Furthermore, in order to make the press-fit load appropriate, the adjustment plug is required to be processed with high accuracy, which increases the cost.

  The present invention has been made to solve the above problems, and a spool valve that is pressed in one direction by electromagnetic thrust generated in the solenoid portion is fitted in a sleeve hole of a valve body provided with a solenoid portion at one end. And a solenoid member in which a spring member for biasing the spool valve in a direction opposite to the electromagnetic thrust is provided between an adjuster fixed to an attachment hole formed at the other end of the valve body and the spool valve. An object of the present invention is to provide an electromagnetic valve characterized in that, after the adjuster is fixed to the valve body, the adjuster is deformed to adjust the set load of the spring member.

In order to achieve the above object, the invention according to claim 1 is characterized in that a spool valve that is pressed in one direction by electromagnetic thrust generated in the solenoid is inserted into a sleeve hole of a valve body provided with a solenoid at one end, A spring member that urges the spool valve in a direction opposite to the electromagnetic thrust is compressed between the spool valve and an adjuster formed in a bottomed thin cylindrical shape that is fixed to a mounting hole formed at the other end of the valve body. In the solenoid valve provided, the adjuster is inserted into the mounting hole of the valve body , the outer peripheral surface of the adjuster is brought into close contact with the inner peripheral surface of the mounting hole, and a protrusion is formed on the end surface of the valve main body by caulking and fixed. The projecting portion fitted into the outer end of the spring member is deformed to adjust the set load of the spring member.
According to the present invention, since it is not necessary to perform screw processing for fixing the adjuster to the valve body, the cost can be reduced.
In the invention according to claim 2, since the deformation of the adjuster presses the convex portion of the adjuster with the pressure adjusting device, a step that affects the set load of the spring member after the adjustment becomes unnecessary, and the set load of the spring member becomes unnecessary. This is preferable because it is possible to reduce the error.

According to the present invention, the adjuster is fitted into the mounting hole of the valve body , the outer peripheral surface of the adjuster is made the inner peripheral surface of the mounting hole, and a protrusion is formed on the end surface of the valve main body by caulking to fix the spring member. It is possible to eliminate the step affecting the set load of the spring member after the adjustment and reduce the error of the set load by deforming the convex part fitted into the outer end of the spring and adjusting the load of the spring member. . In addition, it is possible to reduce the cost without the need for adjuster screw molding or processing requiring high accuracy.

It is a longitudinal section showing a schematic structure of a solenoid valve concerning an embodiment of the invention. It is a perspective view of an adjuster. It is operation | movement explanatory drawing which inserts an adjuster in the attachment hole of a valve main body. It is operation | movement explanatory drawing which fixes an adjuster to a valve body. It is a principal part enlarged view of FIG. It is a copy figure which shows the mechanism which deform | transforms an adjuster. It is operation | movement explanatory drawing which shows the process of deforming an adjuster, and shows the state before deforming an adjuster. It is operation | movement explanatory drawing which shows the process in which an adjuster is deform | transformed, and shows the state in which the adjuster is deform | transforming with the pressure regulator. It is operation | movement explanatory drawing which shows the process which deform | transforms an adjuster, and shows the state which adjusted the elastic force of the spring member by deforming an adjuster. It is another operation explanatory drawing which fixes an adjuster to the attachment hole of a valve body. It is a principal part enlarged view of FIG. It is another operation | movement explanatory drawing which fixes an adjuster to the attachment hole of a valve main body. It is a principal part enlarged view of FIG.

Preferred embodiments of the electromagnetic valve of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a schematic structure of a solenoid valve 10 according to an embodiment of the present invention.
The electromagnetic valve 10 includes a housing 11 made of a magnetic metal material, and the housing 11 includes a cylindrical portion 12 and a flange portion 13. A fitting hole 14 is formed through the inside of the housing 11. In this case, the cylindrical portion 12 has a function as a fixed iron core.

A bearing mechanism 15 is mounted in the fitting hole 14. The bearing mechanism 15 includes a cylindrical resin bearing member 16 having a relatively thin wall thickness along the axial direction, and a magnetic metal ball 17 inserted into the bearing member 16.
Since the bearing member 16 supports the rod 18 at both ends and is formed integrally with the rod 18, the fitting hole 14 is displaced in the axial direction together with the rod 18.

  A solenoid 20 is disposed on the outer periphery of the housing 11, and the solenoid 20 is covered with a cover 23 around which a coil 22 is wound around a bobbin 21. A nonmagnetic end cover 24 is in contact with one end of the solenoid 20, and one end of the cover 23 is fixed to the end cover 24. A hole 25 is formed in the cover 23 coaxially with the fitting hole 14 of the housing 11, and a movable iron core 26 fixed to the rod 18 is loosely fitted in the hole 25 so as to be displaceable.

  Reference numeral 29 denotes a valve body, which is integrated with the housing 11 by, for example, crimping one end of the cover 23 in contact with the housing 11. A sleeve hole 30 is formed in the valve body 29 coaxially with the fitting hole 14, and a spool 31 is slidably fitted into the sleeve hole 30. In the valve body 29, a tank passage 32 that communicates a tank (not shown) and a sleeve hole 30, a control passage 33 that communicates an actuator (not shown) and the sleeve hole 30, and a pump and sleeve hole 30 (not shown). A supply passage 34 that communicates with each other.

In the spool 31, a first land portion 35 and a second land portion 36 are formed along the axial direction with a space therebetween, and the tank land 32 and the control passage 33 are separated by the first land portion 35. Communication control is performed, and communication control between the control passage 33 and the supply passage 34 is performed by the second land portion 36.
A large-diameter mounting hole 37 is provided coaxially with the sleeve hole 30 at the outer end portion (right end portion in FIG. 1) of the valve body 29, and an adjuster 38 is fitted into the mounting hole 37. Between the adjuster 38 and the end surface of the spool 31 (the right end surface in FIG. 1), a spring member 42 that urges the rod 18 in a direction (leftward in FIG. 1) is interposed.

As shown in FIG. 2, the adjuster 38 is formed, for example, by press molding so that the closed end wall 38 b is connected to one end of the cylindrical peripheral wall 38 a and the adjuster body 41 is formed into a thin bottomed cylindrical shape. At that time, the closed end wall 38 b is simultaneously formed with a convex portion 39 that fits into the outer end of the spring member 42.
The adjuster 38 is provided with an adjuster main body 41 in the circumferential direction. When the adjuster 38 is fitted into the mounting hole 37, the outer peripheral surface of the adjuster main body 41 comes into close contact with the inner peripheral surface of the mounting hole 37. Yes.

3 to 5 are diagrams for explaining the operation when the adjuster 38 is fixed to the mounting hole 37 of the valve main body 29. FIG.
First, as shown in FIG. 3, the outer peripheral surface of the adjuster main body 41 is fitted into the inner peripheral surface of the mounting hole 37, and the one end surface 41 a of the adjuster main body 41 is brought into contact with the end surface 37 a of the mounting hole 37.
Next, as shown in FIGS. 4 and 5, the end surface 29a of the valve body 29 is caulked with a caulking jig 43 in the direction of arrow X, a projection 44 is formed on the end surface 29a, and the other end surface 41b of the adjuster 41 is pressed, The adjuster 38 is fixed to the valve body 29.

  On the other hand, the output of the solenoid valve 10 can be changed by adjusting the elastic force biased by the spring member 42. Therefore, in the embodiment of the present invention, as shown in FIG. 6, a pressure generating source 45 is connected to the supply passage 34 and a specified current is supplied to the solenoid 20 to measure the pressure oil in the control passage 33 with the pressure gauge 46. However, the adjuster 38 is deformed by the pressure adjusting device 47 until the hydraulic pressure in the control passage 33 reaches a predetermined value.

  FIGS. 7 to 9 are operation explanatory views showing the process of deforming the adjuster 38. FIG. 7 is a view before the adjuster 38 is deformed. The state fixed to the valve body 29 is shown. Therefore, in FIG. 7, one end of the spring member 42 is engaged with the spool 31, and the other end is secured in a state of contacting the convex portion 39 that forms the closed end wall 38 b of the adjuster 38.

FIG. 8 shows a state in which the adjuster 38 is deformed by the pressure adjusting device 47. The pressure adjusting device 47 is moved in the direction of the arrow X to apply a deformation load to the convex portion 39 of the adjuster 38. The elastic force of the spring member 42 is adjusted by deforming the convex portion 39 in the arrow X direction.
At this time, if the pressing force of the pressure adjusting device 47 applied to the adjuster 38 is removed, the seating surface of the spring member 42 of the convex portion 39 of the adjuster 38 moves in the arrow Y direction by the amount of the spring back, so the deformation amount is corrected. To do.
Specifically, the adjuster 38 may be deformed by correcting the deformation amount in advance from the value of the deformation load and the elastic coefficient of the material. Further, at the time of pressure adjustment, the deformation load may be removed once before the target value, the amount of spring back at that time may be measured to correct the deformation amount, and the deformation may be performed again.
FIG. 9 shows a state where the adjustment of the elastic force of the spring member 42 is completed by deforming the convex portion 39 of the adjuster 38.

FIG. 10 shows another operation explanatory view for fixing the adjuster 38 to the mounting hole 37 of the valve body 29. In FIG. 10, the same constituent elements as those in FIGS. Is omitted.
In FIG. 10, when the adjuster 38 is fixed to the adjuster body 41, the adjuster 38 is caulked from the radial direction. Specifically, a hole 41c is formed in the adjuster main body 41 in the radial direction, the adjuster 38 is inserted into the mounting hole 37 of the valve main body 29, and then the receiving jig 48 is inserted into the inner peripheral surface of the adjuster 38 to receive the receiver. The end surface of the jig 48 is brought into contact with the convex portion 39. Next, when a portion outside the valve main body 29 corresponding to the hole 41c formed in the adjuster main body 41 is caulked by the receiving jig 48 and the caulking tool 49, the valve facing the hole 41c as shown in FIGS. A protrusion 50 is formed on the inner peripheral surface of the main body 29, and the adjuster 38 is fixed to the valve main body 29.

  12 and 13 show another operation explanatory view for fixing the adjuster 38 to the mounting hole 37 of the valve body 29. In FIG. 12 and FIG. 13, the same constituent elements as those shown in FIGS. Are the same and will not be described in detail. FIGS. 12 and 13 show that the valve main body 29 and the adjuster 38 are caulked with a jig 48 and a caulking tool 49, and are formed and fixed to the valve main body 29 and the adjuster 38 by caulking of a concave portion 51 and a convex portion 52. Since it is substantially the same as the content described in 3160747, detailed description is abbreviate | omitted.

When assembling the solenoid valve 10, the spool 31 is inserted into the sleeve hole 30 of the valve body 29 through the mounting hole 37, the spring member 42 is inserted, and the inner end of the spring member 42 (on the left side in FIG. 1). ) Is brought into contact with the outer end of the spool 31 (right side in FIG. 1). Next, the adjuster body 41 of the adjuster 38 is inserted into the mounting hole 37 while the outer end (right side in FIG. 1) of the spring member 42 is supported by the convex portion 39 of the closed end wall 38 b of the adjuster 38.
4 and 5, the end face 29a of the valve body 29 is caulked in the direction of the arrow X, and caulking is formed by the caulking jig 43. A projection 44 is formed on the end face 29a, and the other end face 41b of the adjuster 41 is formed. Holding the adjuster 38 to the valve body 29.
After that, as shown in FIG. 8, the pressure adjusting device 47 is moved in the direction of arrow X, a deformation load is applied to the convex portion 39 of the adjuster 38, and the convex portion 39 is deformed in the arrow X direction. Adjust the resilience of.

DESCRIPTION OF SYMBOLS 10 Solenoid valve 11 Housing 12 Cylindrical part 15 Bearing mechanism 16 Bearing member 17 Ball 20 Solenoid 29 Valve main body 30 Sleeve hole 31 Spool 37 Mounting hole 38 Adjuster 41 Adjuster main body 42 Spring member 43 Fixing plate 44, 50 Protrusion 45 Hydraulic generator 46 Pressure Total 47 Pressure regulator 48 Receiving jig 49 Caulking tool

Claims (2)

The solenoid sleeve bore of the valve body which is attached to one end, a bottom which is fixed to the mounting hole fitted a spool valve which is pressed in one direction by electromagnetic thrust, formed in the other end of the valve body generated in the solenoid In a solenoid valve in which a spring member for biasing the spool valve in a direction opposite to the electromagnetic thrust is provided between an adjuster formed in a thin cylindrical shape and the spool valve, the adjuster is attached to a mounting hole of the valve body. Inserting and fixing the outer peripheral surface of the adjuster closely to the inner peripheral surface of the mounting hole, forming and fixing a protrusion on the end surface of the valve body by caulking, and deforming the convex portion inserted into the outer end of the spring member, the spring An electromagnetic valve characterized by adjusting a set load of a member. In the solenoid valve according to claim 1,
The electromagnetic valve, wherein the adjuster is deformed by pressing a convex portion of the adjuster with a pressure regulator.

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