JPH1167528A - Solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a solenoid by reducing the number of parts by integrally molding a pipe section and a case section. SOLUTION: A solenoid 5 is provided with a resin case 51. The case 51 is composed of an integrally molded body, in which a case section 51b is arranged around a bottomed pipe section 51a, and the pipe section 51a houses a movable core 52 in a state such that the core 52 is slidable in the axial direction. The case section 51b houses a solenoid coil 56 wound around a bobbin 55, a hollow cylindrical case 58 which is arranged on the outer peripheral side of the coil 56 and made of a magnetic material, and doughnut-shaped platy yokes 54 and 57 arranged on the both end face sides of the case 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid which is mounted on a valve body and forms an electromagnetic valve together with the valve body.

[0002]

2. Description of the Related Art In general, an electromagnetic valve, which is a component of a hydraulic circuit or the like, includes a pair of left and right solenoids (electromagnets) having the same structure for operating the spool provided on a valve body having a built-in spool for opening and closing an oil passage and the like. ).

FIG. 3 shows a sectional view of a conventional example of one of a pair of left and right solenoids of this kind.

A solenoid 1 shown in FIG. 3 is a solenoid widely used for an oil immersion type solenoid valve and the like. The solenoid 1 includes a coil assembly 2, a tube assembly 3, and a nut 4.

The coil assembly 2 includes a resin bobbin 21
And a solenoid coil 22 wound around the bobbin 21
And a plurality of donut-shaped yokes 23 forming a part of the magnetic circuit MC indicated by the dashed arrows when the solenoid coil 22 is excited, and a hollow cylindrical magnetic body also forming a part of the magnetic circuit MC 24 and the solenoid coil 22
Terminal pin 25 for taking in current from outside
By setting these components 21 to 25 in a mold and injecting a resin material, the components 21 to 25 are molded and integrally formed in the resin case 26.

The tube assembly 3 is a coil assembly 2
Is inserted into the hollow portion of the bobbin 21. The tube assembly 3 includes a fixed iron core 31 having a male screw 31 a screwed into a female screw formed on a valve body (not shown), a movable iron core (plunger) 32 receiving a magnetic attraction force from the fixed iron core 31 when the solenoid coil 22 is excited, One end is welded to the fixed iron core 31 and the other end is welded to the stopper 34. The pipe 33 is made of a non-magnetic material and accommodates the movable iron core 32 slidably in the axial direction. And is integrally formed with the stopper 34. A manual operation pin 39 is slidably inserted into the through hole of the stopper 34 while ensuring sealing properties. The manual operation pin 39 is for manually operating a spool (not shown) in the valve body via the movable iron core 32 and the push pin 35 by an operation from the outside.

The nut 4 is a nut that is screwed into the external thread 34a of the stopper 34 of the tube assembly 3.
It is used to integrate the tube assembly 3 and the coil assembly 2 into a valve body. That is, the method of mounting the solenoid on the valve body is as follows. The male screw 31a of the fixed iron core 31 of the tube assembly 3 is screwed into the female screw of the valve body, and the coil assembly 2 is assembled to the tube assembly 3. The nut 4 is screwed into the male screw 34a.

The lower end surface of the movable iron core 32 is in contact with the upper end surface of a push pin 35.
5 is in contact with a spool (not shown) of the valve body through a through hole 31b in the vertical direction of the fixed iron core 31. Further, when the solenoid coil 22 is demagnetized and the other solenoid (which is located on the opposite side of the valve body with respect to the solenoid shown in FIG. 3 and has the same structure as the solenoid shown in FIG. 3) is energized, the spool (Not shown) pushes the push pin 35 against the elastic force of a spring (not shown), and the movable core 32 is separated from the fixed core 31.

[0009]

However, according to the above-described conventional solenoid, the pipe 33 and the resin case 26 are not provided.
Are formed separately, and there is a problem that the number of parts is large and the cost is high.

An object of the present invention is to solve the above problems and reduce the number of parts and cost by integrally molding a pipe portion and a case portion with a resin.

[0011]

SUMMARY OF THE INVENTION The solenoid of the present invention comprises:
A solenoid provided with a resin case, wherein the resin case is formed of an integrally molded product having a case portion disposed around a bottomed pipe portion, and the bottomed pipe portion allows a movable iron core to slide in an axial direction. The case is housed, and the case portion is provided on a solenoid coil wound around a bobbin, a hollow cylindrical case made of a magnetic material disposed on the outer peripheral surface side of the solenoid coil, and disposed on both end surfaces of the hollow cylindrical case. The donut plate-shaped yokes are respectively housed.

[0012]

According to the present invention, since the pipe portion and the case portion are integrally formed of resin, the number of parts can be reduced and the cost can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a solenoid according to one embodiment, and FIG. 2 is a sectional view of the solenoid.

The solenoid 5 of this embodiment has a resin case 51 which is integrally formed. The resin case 51 has a bottomed pipe portion 51a and a case portion 51b coaxially arranged around the bottomed pipe portion 51a.
1b has a donut plate-shaped lid 51d extending from the bottom wall 51c of the bottomed pipe 51a. Also, the case part 5
At the free end of 1b, an attachment portion 51e is formed which is attached to the valve body 7 by an attachment 6 such as a bolt.

A movable core (plunger) 52 is slidably accommodated in the bottomed pipe portion 51a in the axial direction, and a small-diameter portion 53a of a fixed iron core 53 is inserted into an opening thereof.

A donut plate-shaped yoke 54, a solenoid coil 56 wound around a bobbin 55, and another donut plate-shaped yoke 57 are arranged in the annular concave portion of the case portion 51 b from the back, and the outer peripheral surface of the solenoid coil 56. A hollow cylindrical case 58 made of a magnetic material is disposed on the side. The two donut plate yokes 54 and 57 are arranged on both end surfaces of the hollow cylindrical case 58.

The resin case 51 and the hollow cylindrical case 58 are formed with notches 51f and 58a for leading the lead wire 56a of the solenoid coil 56 to the outside.

Next, a description will be given of an example of a method of fixing the solenoid 5 composed of the above-described components to the valve body 7. The movable core 52 is inserted into the bottomed pipe portion 51a of the resin case 51, and the case portion 51b is The donut plate-shaped yoke 54, the solenoid coil 56, the hollow cylindrical case 58, and another donut plate-shaped yoke 57 are accommodated in order from the back, and the small-diameter portion 53 a of the fixed iron core 53 set in the concave portion 71 of the valve body 7 is removed. Inserted into the opening of the bottomed pipe part 51a,
The mounting portion 51e is fixed to the valve body 7 by the mounting bracket 6. Here, the lead wire 56a is connected to the hollow cylindrical case 58.
And the resin case 51 and the hollow cylindrical case 5 so as to go outside through the cutouts 58a and 51f of the resin case 51.
It goes without saying that the positioning of the solenoid coil 8 and the solenoid coil 56 is performed.

As described above, the solenoid 5 of this embodiment is a solenoid having the resin case 51,
The resin case 51 is made of an integrally formed product having a case portion 51b disposed around a bottomed pipe portion 51a. The bottomed pipe portion 51a houses the movable iron core 52 so as to be slidable in the axial direction. Are a solenoid coil 56 wound around a bobbin 55, a hollow cylindrical case 58 made of a magnetic material disposed on the outer peripheral surface side of the solenoid coil 56, and a donut disposed on both end surfaces of the hollow cylindrical case 58. It is characterized by accommodating the plate-like yokes 54 and 57, respectively.

For this reason, according to the solenoid 5 of this embodiment, since the pipe portion 51a and the case portion 51b are integrally formed of resin, the number of parts can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a solenoid according to one embodiment.

FIG. 2 is a sectional view of the solenoid.

FIG. 3 is a sectional view of a conventional solenoid.

[Explanation of symbols]

 Reference Signs List 5 solenoid 51 resin case 51a bottomed pipe part 51b case part 52 movable iron core 54, 57 donut plate yoke 55 bobbin 56 solenoid coil 58 hollow cylindrical case

Claims (1)

[Claims] 1. A solenoid provided with a resin case, wherein the resin case is formed of an integrally molded product having a case portion disposed around a bottomed pipe portion, and the bottomed pipe portion is configured to move a movable iron core in an axial direction. The case portion includes a solenoid coil wound around a bobbin, a hollow cylindrical case made of a magnetic material disposed on an outer peripheral surface side of the solenoid coil, and both end surfaces of the hollow cylindrical case. Solenoids each accommodating a donut plate-shaped yoke arranged on the side.