JP2012225406A - Solenoid selector valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid selector valve in which the spool of the solenoid selector valve is surely returned when the valve is manually operated and suction and displacement of a manual operation pin by negative pressure is prevented when electromagnetically operated.SOLUTION: The solenoid selector valve 10 includes solenoid coils 12a and 12b which are attached to both end surfaces of a valve body 11 and generate attracting force, and plates 37a and 37b which are engaged with the axial side wall surfaces of the coils 12a and 12b, wherein the solenoid coils 12a and 12b and the plates 37a and 37b are joined to the valve body 11 by attaching bolts 38a and 38b. At the center of the side wall surfaces of the tubes 23a and 23b of the solenoid coils 12a and 12b, the projections 39a and 39b of the tubes 23a and 23b are inserted into holes 41a and 41b formed in the plates 37a and 37b, the projections 39a and 39b are pressed by a tool, and movable iron cores 24a and 24b are moved to manually switch the solenoid coils 12a and 12b.

Description

  The present invention relates to an electromagnetic switching valve, and to an improvement in the structure of an electromagnetic switching valve that can be equipped with a manual operation pin at low cost.

  Conventionally, a solenoid 50, which is this type of electromagnetic switching valve, includes a cylindrical nonmagnetic ring 52 welded to one end (right end in FIG. 3) of a fixed iron core 51, as shown in FIG. A thin-walled cylindrical tube-shaped solenoid guide 53 welded to the other end (left end in FIG. 3), and a lid 54 welded or integrally formed to the other end (left end in FIG. 3) of the solenoid guide 53; And a plunger 55 that is inscribed in the nonmagnetic ring 52 and the solenoid guide 53 and is movable in the axial direction. Further, a push pin 56 that presses the plunger 55 in the axial direction is slidably supported on the lid 54 (see, for example, Patent Document 1).

Japanese Patent No. 3095252

However, in Patent Document 1, a lid 54 formed by welding on the solenoid guide 53 is required, and the number of parts is large. Moreover, a welding process is required and productivity is low.
The present invention has been made to solve the above problems, and an object of the present invention is to provide an electromagnetic switching valve that can be easily switched manually by minimizing the number of parts and that has a simplified structure. To do.

In order to achieve the above object, the present invention provides:
A valve body;
A fixed iron core engaged with at least one end surface of the valve body;
A coil portion provided around the fixed iron core and integrally formed with a mold;
A tube member that is slidably inserted into the inner peripheral surface of the coil portion and has one end having a small diameter, and
A movable iron core that is slidably inserted into the inner peripheral surface of the tube member and whose shaft portion is slidably supported by the fixed iron core;
A spring member mounted on the fixed iron core and moving the movable iron core in the axial direction by an elastic force when the coil portion is not excited;
In an electromagnetic switching valve with
A plate attached to an end surface of the mold and attached to the valve body integrally with the mold and disposed in proximity to a side wall surface of the tube member;
The tube member is provided on a side wall surface that engages with the plate, and a cylindrical protrusion that is slidably supported in a hole provided in the plate;
An extruding member having a disc portion that is slidably inserted into the inner peripheral surface of the protruding portion and has a disc portion that abuts against the side wall surface of the tube member;
Have
The pushing member is pressed against the side wall surface of the movable iron core with a tool or the like to move the movable iron core in the axial direction to move the non-excited movable iron core.

  In the present invention, since the solenoid guide and the lid are integrally formed, the structure is simplified, so that the cost can be reduced.

1 is a longitudinal sectional view showing a schematic structure of an electromagnetic switching valve according to an embodiment of the present invention. It is a principal part enlarged detail view of the tube member shown in FIG. It is a longitudinal cross-sectional view which shows schematic structure of the conventional solenoid valve.

An electromagnetic switching valve 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a schematic structure of an electromagnetic switching valve 10 according to an embodiment of the present invention.
As shown in FIG. 1, the electromagnetic switching valve 10 basically includes a substantially rectangular valve body 11 and solenoid coil portions 12 a and 12 b that are attached to both end faces of the valve body 11 and generate a suction force. It is configured.

In the valve body 11, a spool 15 is slidably inserted into a spool hole 14 formed in the body 13. On both end surfaces (the left side and the right side in FIG. 1) of the body 13, the concave portions 11a and 11b formed coaxially with the spool hole 14 and the convex portions 29a of the solenoid coil portions 12a and 12b, 29b is fitted, and the body 13 and the solenoid coil portions 12a, 12b are liquid-tightly sealed by the seal member 16 of the O-ring.
The body 13 has a pressure port 18 communicating with a pressure supply source (not shown) connected to the spool hole 14, and tank ports 19 a, 19 b communicating with a tank (not shown) spaced apart in the axial direction of the spool hole 14. Channels 20 and 21 that are provided orthogonally and communicate with the spool hole 14 and connect to a hydraulic actuator (not shown) between these ports 18, 19 a, and 19 b are provided orthogonally to the axial direction of the spool hole 14. The tank ports 19a and 19b communicate with each other through a communication path 22.

Since the solenoid coil portions 12a and 12b have the same configuration, only one solenoid coil 12a will be described, and the other solenoid coil portion 12b will be denoted by reference numerals and detailed description thereof will be omitted.
The solenoid coil portion 12a includes a coil portion 17a formed integrally with a mold 28a, which will be described later, and a tube (tube member) 23a having a thin cylindrical shape in the axial direction with the inner peripheral surface of the coil portion 17a as a guide. A fixed iron core 26a having one side inserted into the inner peripheral surface of the tube 23a and the other side inserted into the valve body 11, and a large diameter portion slidably inserted into the inner peripheral surface of the tube 23a. A movable iron core 24a having a plunger function whose portion 25a is slidably supported by the fixed iron core 26a, a coil case 27a fitted on the outer peripheral surface of the coil portion 17a, and the coil portion 17a and the coil by a resin material. A mold 28a formed integrally with the case 27a.

A thick cylindrical fixed iron core 26a is fitted on the inner peripheral surface of the tube 23a, and a stepped hole 30a is formed on the inner peripheral surface formed on the convex portion 29a of the fixed iron core 26a. Yes. A spring member 32a is attached to the small diameter portion 31a of the stepped hole portion 30a. One side (the left side in FIG. 1) of the spring member 32a is loosely inserted into the outer peripheral portion of the shaft portion 25a of the movable iron core 24a, and one end (the left end in FIG. 1) engages with the end surface of the small diameter portion 31a. The end face of the retainer 35a, whose right side in FIG. 1 is loosely inserted into the outer peripheral portion of the guide portion 33a of the spool 15 and has the same diameter as the shaft portion 25a, and whose other end (right end in FIG. 1) is housed in the large diameter portion 34a. Is engaged.
Reference numeral 36a denotes a spacer inserted into the large-diameter portion 34a, and the lengths of the concave portion 11a and the convex portion 29a so that the concave portion 11a of the valve body 11 and the convex portion 29a of the solenoid coil portion 12a are closely engaged. It has a function to adjust.

FIG. 2 is an enlarged detail view of a main part of the tube member 23a. In FIG. 2, the tube member 23a has a cylindrical protrusion 39a on the side wall surface (left side surface in FIG. 2) that is substantially the same as the wall thickness of the tube member 23a in a hole 41a provided in the axial direction on the plate 37a. It is loosely inserted.
An extrusion pin (extruding member) 42a for pressing the side wall surface (left wall surface in FIG. 2) of the movable iron core 24a is formed on the inner peripheral surface of the protruding portion 39a. The protruding pin 42a slides on the protruding portion 39a. The shaft part 43a supported freely, and the disk (disk part) 44a which presses and presses the side wall surface (left wall surface in FIG. 2) of the movable iron core 24a are provided. The disk 44a has a large area in contact with the side wall surface of the movable iron core 24a to reduce the pressing force on the side wall surface.
Reference numeral 40 denotes an O-ring which is a seal member attached to the outer peripheral surface of the push pin 42a.

The case where the solenoid coil part 12a is attached to the left side surface of the valve main body 11, for example, the recessed part 11a is demonstrated.
First, the spool 15 is slidably fitted into the spool hole 14 of the valve body 11, the spacer 36 a is attached to the recess 11 a of the valve body 11, and the retainer 35 a is fitted to the guide portion 33 a of the spool 15. deep.
Next, after assembling the solenoid coil portion 12a as shown in FIG. 1, the other side of the spring member 32a guided by the shaft portion 25a of the plunger 24a is loosely inserted into the guide portion 33a of the spool 15, and the solenoid coil portion 12a The convex portion 29 a is fitted into the concave portion 11 a of the valve body 11.

In this state, a plurality of, for example, four (only two are shown in FIG. 1) are displayed with the disk-shaped or rectangular plate 37a engaged with the back surface (left side in FIG. 1) of the solenoid coil portion 12a. The mounting bolt 38a is loosely inserted into the plate 37a and the solenoid coil portion 12a, and the mounting bolt 38a is screwed to the valve body 11.
In the electromagnetic switching valve 10 shown in FIG. 1, the tube 23a is disposed in the space between the fixed iron core 26a and the plate 37a, but the side of the tube 23a is prevented from being deformed by the tightening force of the mounting bolt 38a. By providing a gap, for example, a gap of about 0 to 0.5 mm, between the wall surface (left side surface in FIG. 1) and the side wall surface (right side surface in FIG. 1) of the plate 37a, the tube 23 should not be deformed. Can do.

Since the electromagnetic switching valve 10 according to the present invention is basically configured as described above, in order to manually operate the non-excited solenoid coil portion 12a, the push pin 42a is moved by a movable iron core with a tool or the like (not shown). When the side wall surface of 24a (the left side surface in FIG. 1) is pressed in the arrow X direction, the movable iron core 24a starts moving in the arrow X direction using the inner peripheral surface of the tube 23a as a guide.
As the movable iron core 24a moves, the end surface (right end in FIG. 1) of the shaft portion 25a of the movable iron core 24a contacts the guide portion 33a of the spool 15, and the end surface of the spool 15 abuts against the retainer 35b. It moves in the direction of arrow X against the resilience of 32b. For this reason, when the plunger 23b and the tube 23b constituting the solenoid coil portion 12b move in the direction of the arrow X, the flow path in the valve body 11 can be switched by manual switching of the solenoid coil portion 12a.

On the other hand, in the manual switching of the solenoid coil portion 12a in the arrow Y direction, when the pressing of the tube 23a by a tool or a rod is stopped, the spool 15 is moved in the arrow Y direction by the elastic force of the spring member 32b. Movement of the guide portion 33a causes the plunger 24a to move.
It is possible to switch the flow path in the valve body 11 by hitting the shaft portion 25a and moving the plunger 24a in the arrow Y direction.
The electromagnetic switching valve 10 according to the embodiment of the present invention has been described with respect to the case where the solenoid coil portions 12a and 12b are attached to both side surfaces of the valve body 11, but either one of the solenoid coil portions 12a and 12b is attached to the side surface of the valve body 11. One of them may be an electromagnetic switching valve.

DESCRIPTION OF SYMBOLS 10, 60 Electromagnetic switching valve 11 Valve body 12 Solenoid coil part 13 Body 14 Spool hole 15 Spool 23 Tube 24 Movable iron core 25 Shaft part 26 Fixed iron core 27 Coil case 28 Mold 29 Protrusion part 30 Stepped hole part 31 Small diameter part 32 Spring member 33 Guide part 34 Large diameter part 35 Retainer 36 Spacer 37 Plate 38 Mounting bolt 39 Projection part 41 Hole 42 Extrusion pin 43 Shaft part 44 Disk

Claims (1)

A valve body;
A fixed iron core engaged with at least one end surface of the valve body;
A coil portion provided around the fixed iron core and integrally formed with a mold;
A tube member that is slidably inserted into the inner peripheral surface of the coil portion and has one end having a small diameter, and
A movable iron core that is slidably inserted into the inner peripheral surface of the tube member and whose shaft portion is slidably supported by the fixed iron core;
A spring member mounted on the fixed iron core and moving the movable iron core in the axial direction by an elastic force when the coil portion is not excited;
In an electromagnetic switching valve with
A plate attached to an end surface of the mold and attached to the valve body integrally with the mold and disposed in proximity to a side wall surface of the tube member;
The tube member is provided on a side wall surface that engages with the plate, and a cylindrical protrusion that is slidably supported in a hole provided in the plate;
An extruding member having a disc portion that is slidably inserted into the inner peripheral surface of the protruding portion and has a disc portion that abuts against the side wall surface of the tube member;
Have
An electromagnetic switching valve characterized in that the non-excited movable core is moved by pressing the pushing member against a side wall surface of the movable core with a tool or the like to move the movable core in the axial direction.