JP3362307B2 - solenoid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid having a movable iron core.

[0002]

2. Description of the Related Art Conventionally, a solenoid has a coil assembly in which a coil is mounted, a tube assembly arranged in the coil assembly, and a cap connecting the coil assembly and the tube assembly. . The tube assembly has a tubular pipe and a movable iron core that slides inside the pipe.The movable iron core is usually attracted to a fixed iron core by exciting the coil and provided on the cap side by a spring when the coil is deenergized. It is returned to the position where it abuts the stopper. A pin that connects to the spool of the valve body is attached to the movable iron core. The pin attached to the movable iron core is attached to one side of the movable iron core,
Some of them are formed so as to project to both sides of the movable iron core, and those in which pins are mounted on one side of the movable iron core are slidably supported between the movable iron core and the pipe, and both sides of the movable iron core are The one projecting to is slidably supported between the pin and the bearing mounted in the pipe.

[0003]

However, in the conventional solenoid, the tube assembly has a fixed iron core formed with a male screw on the tip side (valve body side) in the pipe and is movable so as to face the fixed iron core. The iron core is slidably mounted. A spanner hook is formed on the rear end of the pipe, and when the pipe is attached to the valve body, a male screw is fitted to the valve body, and then the pipe is attached while being rotated with a tool such as a spanner. Therefore, when mounting on the valve body, the tube assembly and the coil assembly are mounted on the valve body without mounting the cap. At this time, since the non-valve body side of the tube assembly is released, the movable iron core easily falls from the released side. If the movable iron core falls and is damaged, it will be replaced with a defective product, so in the past, it was necessary to work with caution.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a solenoid having fall prevention measures so as not to drop the movable iron core when the solenoid is mounted on the valve body. To do.

[0005]

The solenoid according to the present invention is configured as follows in order to solve the above problems. That is, a coil assembly having a coil attached thereto, a tube assembly disposed in the coil assembly, and a cap connecting the coil assembly and the tube assembly are provided, and the tube assembly is formed into a tubular shape. And a movable iron core that slides in the pipe, and a movable iron core fall prevention unit is provided in the tube assembly.

[0006] Preferably, the fall prevention means has a step portion formed near the inlet of the pipe on the cap side, and a snap ring means having a spring property arranged in the step portion. It is characterized by being done.

It is sufficient that the retaining ring means is located closer to the cap inlet side than the stopper surface at the stroke end of the movable iron core arranged in the cap.

Further, it is more preferable that an outer peripheral taper surface is formed on the end surface side of the movable iron core which can come into contact with the retaining ring means.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. What is applied to this solenoid may be one having a tube assembly and a fixed iron core and a movable iron core slidably mounted on the fixed iron core, for example, ON / O.
The FF solenoid, the proportional solenoid, or the movable iron core may be provided with a pin that is connected to the spool of the valve body or may be protruded on both sides.

FIG. 1 is a sectional view showing an embodiment of an electromagnetic proportional solenoid provided with a measure for preventing the movable iron core from falling. An electromagnetic proportional solenoid (hereinafter referred to as a solenoid) 1 is a coil 4 wound around a bobbin 3. And the coil assembly 2 in which the yokes 5 and 6 that form the coil outer peripheral circuit body are integrally formed
And a cap 21 that connects the coil assembly 2 and the tube assembly 11 with each other, and is provided in the coil assembly 2.

The tube assembly 11 is mounted on the inner peripheral surface of the bobbin 3 and has a tubular shape. A fixed iron core is integrally formed on the tip end side of the pipe 12 via a non-magnetic magnetic blocking member 13. 14 and a movable iron core 16 which is attracted to the fixed iron core 14 and slides in the pipe 12. Fixed core 14 is the tip (downward in FIG. 1)
A male screw 14a is formed on the portion and is screwed to a valve body (not shown). The magnetic blocking member 13 is formed with an inclined surface 13a between the pipe 12 and the fixed iron core 14 in order to have horizontal characteristics as an electromagnetic proportional solenoid. In particular, by forming this inclined surface 13a, it plays a role as an electromagnetic proportional solenoid that can linearly represent the relationship between the electric current and the attractive force.

The movable iron core 16 is provided with a pin 17 penetrating the fixed iron core 14 on the tip side (downward in FIG. 1) and connected to a spool of a valve body (not shown), and the outer peripheral surface of the movable iron core 16 is inside the pipe 12. While being slidably supported on the peripheral surface, the pin 17 is configured to be movable between the fixed iron core 14 and the fixed iron core 14 with a gap slightly larger than the gap formed between the movable iron core 16 and the pipe 12. Furthermore, a taper surface 16a is formed on the rear end side (upper side in FIG. 1) end surface of the movable iron core 16 so that the diameter becomes smaller toward the rear.

The pipe 12 is formed in a tubular shape as described above, and its rear end portion is, as shown in FIG.
6 has a step portion 12a formed with a diameter larger than that of the sliding surface with respect to 6, and is opened. A ring-shaped retaining ring 18 having a small diameter is partially attached to the step portion 12a as shown in FIG. The retaining ring 18 has a spring property and is formed to have a diameter larger than that of the step portion 12a in a natural state, and is bent inward so as to bend.
When inserted into a, the inner peripheral surface of the retaining ring 18 is formed to have a smaller diameter than the sliding surface of the movable iron core 16 of the pipe 12.
Therefore, the movable iron core 16 can be brought into contact with the retaining ring 18 fixed by the stepped portion 12a, and the movable iron core 16 can be separated from the pipe 12 even if the movable iron core 16 moves to the side opposite to the valve side (upper side in FIGS. 1 and 2). Therefore, it will serve as a fall prevention function.

The cap 21 is formed in a lid shape so as to close the opening of the tube assembly 11, and an internal thread 21a which can be screwed into the external thread 12b formed on the outer peripheral surface of the pipe 12 is formed on the inner peripheral surface of one end portion. A ring-shaped groove into which the end face of the pipe 12 is inserted is formed in the center of the inside, and a manual operation pin 22 is axially slidably mounted in the center. The tip end of the manual operation pin 22 is formed as a stopper surface 22a when the movable iron core 16 returns and moves, and the tip end surface (the front end surface of the retaining ring 18) of the stepped portion 12a of the pipe 12 described above is a stopper of the manual operation pin 22. It is arranged behind the surface 22a (upper side in FIG. 1).

The fact that the stopper surface 22a of the manual operation pin 22 is located in front of the retaining ring 18 means that the rear end surface of the movable iron core 16 is set to the retaining ring 18 when the movable iron core 16 is moved back in the use state of the solenoid 1. It is configured so as not to interfere. Therefore, the retaining ring 18 can be placed in a fixed state without being attached to or detached from the pipe 12. In other words, once the retaining ring 18 is fixed to the inside of the pipe 12, the retaining ring 18 is not detached each time, and no troublesome work is required and the movable iron core 16 does not fall.

The manual operation pin 22 is used for the movable iron core 16
When it is necessary to manually operate the
The movable iron core 16 is moved by inserting and operating a tool in the turning hole formed in the rear part of 6. Further, in the solenoid in which the manual operation pin 22 is not mounted, the tip end surface of the inner central portion of the cap 21 is formed as a stopper surface, and the tip end surface of the stepped portion 12a is positioned behind the stopper surface as described above.

Further, a spacer 19 made of a non-magnetic material is arranged between the movable iron core 16 and the fixed iron core 14. Further, the cap 21 is partially formed with an air vent 21b to prevent an increase in air pressure due to the movement of the movable iron core 16.

The solenoid 1 constructed as described above is
Normally, in this state, the temporary assembly is carried out and shipped to the process of manufacturing the valve. When mounting the solenoid 1 on a valve body (not shown), after temporarily assembling the coil assembly 2 and the tube assembly 11, with the cap 21 removed, the male screw 14a of the fixed iron core 14 is screwed onto the female screw of the valve body. Then, a tool is attached to a spanner hooking portion (not shown) formed on the pipe 12 and tightened. Since the retaining ring 18 mounted in the pipe 12 can be used in the inserted state, it is not particularly removed. During this work, even if the movable iron core 16 moves in the pipe 12 to the side opposite to the valve side, the movement is restricted by the retaining ring 18 fixed in the pipe 12, and the movable iron core 16 is moved.
It does not separate out of the pipe 12.

Further, when the movable iron core 16 moves in the pipe 12 and interferes with the retaining ring 18, the tapered surface 16a formed on the movable iron core 16 comes into contact with the retaining ring 18. The inertial force generated by the movement of the movable iron core 16 does not act on the retaining ring 8 in the axial direction, but a component force acts in the direction of pressing the inclined retaining ring 8 of the tapered surface 16a toward the pipe 12 side. It is difficult to separate 18 from the pipe 12.

The solenoid 31 shown in FIG. 4 is configured as another form of electromagnetic proportional solenoid, and the coil assembly 3
2, a tube assembly 41, and a cap 51. In addition, the pipe 42 in the tube assembly 41
Is integrally formed with a fixed iron core 44 at its tip, and a movable iron core 46 is slidably arranged in the pipe 42, and a pin 47 attached to the movable iron core 46 is provided with a pin 47.
It penetrates 6 and is projected to both sides of movable iron core 46. At the rear end of the pipe 42, a bearing 48 that supports a pin 47 of a movable iron core 46 is supported and attached to a bearing holder 49, and the other end of the pin 47 is supported by a bearing 50 that is attached to a fixed iron core 44. In this solenoid 31, the pins 47 projecting to both sides are slidably supported by bearings 48 and 50, and a gap formed between the movable iron core 47 and the pipe 42 between the pin 47 and the bearings 48 and 50. It is formed larger.

The tip surface of the bearing holder 49 is formed as a stopper surface 49a for the backward movement of the movable iron core. At the rear end of the pipe 42, a step 42a having a diameter larger than that of the surface of the pipe 42 on which the movable iron core 46 slides is provided.
Of the bearing holder 49 is formed rearward (upper side in FIG. 4) from the stopper surface 49a of the bearing holder 49. A retaining ring 18 shown in FIG. 3 is fixed to the tip portion (downward in FIG. 4) of the step portion 42a. The retaining ring 18 is attached and fixed to the step portion 42a of the pipe 42 by the same operation as described above.
Therefore, the snap ring 18 can prevent the movable iron core 46 from dropping from the pipe 42 when the solenoid 41 is attached to the valve body.

The other parts of the solenoid 42 of this embodiment are basically the same as those in the above-mentioned embodiment, and the description thereof will be omitted.

The shape and size of the retaining ring for preventing the movable iron core from falling from the pipe are not limited to the above.
For example, the retaining ring is not a round bar-shaped section as shown in FIG.
A wide leaf spring 18A may be used as shown in Fig. 1, and a C-type retaining ring for holes, which is generally commercially available with a step formed in a groove, may be attached. Any other design may be used as long as it is fixed to the inner peripheral surface and is formed so as to restrict the movement of the movable core in the falling direction.

[0024]

According to the present invention, the solenoid includes a coil assembly having a coil attached thereto, a tube assembly disposed in the coil assembly, and a cap connecting the coil assembly and the tube assembly. And a movable iron core that slides in the pipe, and a movable iron core fall prevention means is provided in the tube assembly. When the solenoid is attached to the valve body, the tube assembly is attached to the valve body together with the coil assembly with the cap removed. When mounting the tube assembly, the movable iron core moves inside the tube assembly to the side opposite to the valve body. The movement of the movable iron core is regulated by the fall prevention means to prevent the movable iron core from falling outside the tube assembly. Therefore, the solenoid mounting work can be performed without damaging the movable iron core.

Further, in this solenoid, the fall prevention means includes a step portion formed near the inlet of the pipe on the cap side, and a snap ring means having a spring property arranged in the step portion. Is configured. When the retaining ring is mounted in the tube assembly, if the retaining ring is bent and mounted inward, it can be performed easily and without cost.

Further, in this solenoid, since the retaining ring means is located closer to the cap inlet side than the stopper surface at the movable iron core moving stroke end disposed in the cap, the solenoid of the movable iron core is normally used. There is no hindrance to the return movement, and once the retaining ring is mounted in the tube assembly, it remains attached and does not need to be removed each time.

Further, since the outer peripheral taper surface of the solenoid is formed on the end surface side of the movable iron core which can come into contact with the snap ring means, the solenoid is movable while the tube assembly is mounted on the valve body. Even when the iron core hits the retaining ring, the inertial force due to the movement of the movable iron core presses the retaining ring toward the inner peripheral surface side of the tube assembly, and therefore does not serve as a force for separating the retaining ring from the tube assembly.

[Brief description of drawings]

FIG. 1 is a sectional view showing a solenoid of one embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a perspective view showing a retaining ring in FIG.

FIG. 4 is a sectional view showing another form of solenoid.

FIG. 5 is a perspective view showing a retaining ring of another form.

[Explanation of symbols]

1 ... Solenoid 2 ... Coil assembly 4 ... coil 11 ... Tube assembly 12 ... pipe 12a ... Step 14 ... Fixed iron core 16 ... Movable iron core 17 ... pin 18 ... Retaining ring 21 ... Cap 22a ... Stopper surface

Claims (4)

(57) [Claims] 1. A coil assembly to which a coil is attached,
A tube assembly arranged in the coil assembly; and a cap connecting the coil assembly and the tube assembly, and a pipe in which the tube assembly is formed in a tubular shape, and sliding in the pipe. And a movable iron core, wherein the movable iron core fall prevention means is arranged in the tube assembly. 2. The fall prevention means includes a step portion formed near the cap side inlet of the pipe, and a snap ring means having a spring property arranged in the step portion. The solenoid according to claim 1, wherein: 3. The solenoid according to claim 2, wherein the retaining ring means is located closer to the cap inlet side than the stopper surface of the movable core moving stroke end disposed in the cap. 4. The solenoid according to claim 2, wherein an outer peripheral tapered surface is formed on an end surface side of the movable iron core that can come into contact with the snap ring means.