JPS642417Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnet that moves a movable core forward and backward by energizing a coil.

In this type of electromagnet, the space in which the movable iron core moves forward and backward is filled with oil. In order to prevent the oil from leaking, a cylindrical body is used to surround the space in which the moving iron core moves back and forth. There is. However, in conventional configurations, the cylindrical body is constructed by cutting metal materials, brazing, welding, etc., resulting in a large number of parts, a complex number of processes, and a high product price. There were flaws.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks, and to provide an electromagnet that can be easily manufactured and assembled even though it has an oil-immersed structure, and that can reduce the product price. It is something to do.

The drawings 1 and 2 showing embodiments of the present application will be described below. These figures show a solenoid valve device, which is composed of a well-known valve device 1 and an electromagnet 2 for actuating it. In the valve device 1, 3 is a main body, and 4 is a spool, which can freely move forward and backward in the direction of the arrow. 5a, 5b
Spring seat, 6a, 6b are spool return springs, 7,
8a, 8b, 9a, and 9b indicate connection ports, respectively.

Next, in the electromagnet 2, 11 is a housing,
It is made of magnetic material such as soft iron. In this housing 11, 12 is a cylindrical case, 13 is a mounting plate connected to one end of the cylindrical case 12 in an outer flange shape, and a mounting screw 14 is used to attach the valve device to the cylindrical case.
It is fixed to the main body 3 of. 15 is a cylindrical case 12
An inner flange is shown that is integrally connected to the other end (or may be attached after forming a separate body). Next, 16 is housing 1
1 shows the inner frame provided in the interior of the figure. This inner frame body 16
are manufactured by molding synthetic resin materials (e.g. nylon, polycarbonate, PBT, etc.).
In this case, 17 is a cylindrical body, which is composed of a relatively thick winding trunk portion 17a and a thin wall portion 17b. Reference numerals 18 and 19 are projecting portions extending outward from the outer peripheral surface of the winding drum portion 17a. These overhangs 1
8, 19 and the winding drum section 17a constitute a bobbin section 20 for winding a coil, which will be described later. 19a
1 shows a fitting piece protruding from a part of the projecting portion 19. Reference numeral 21 denotes a closing body configured to close one end of the cylindrical body 17. Further, a through hole 22 is bored in this closing body 21, and a well-known push pin 23 for manually operating a movable iron core, which will be described later, is attached thereto so as to be freely advanced and retracted in the direction of the arrow. Next, reference numeral 24 indicates a well-known coil wound around the bobbin portion 20, and 25 indicates a lead wire thereof. A yoke 26 is made of a magnetic material, and a fitting hole 2 is formed in a part of the yoke.
7 is fitted into the fitting piece 19a. The cushion body 28 is made of an oil-resistant rubber material such as nitrile rubber, a heat-resistant rubber material such as chloroprene rubber, or a material such as silicone rubber.
When moving towards the target and colliding with it, the impact force is elastically received to prevent a loud collision sound, and the force of movement in the above direction is absorbed by the inner tsuba 15.
A hardness (hardness of 50 to 70) is used that allows the inner flange 15 to absorb the moving force. 28a indicates a transmission member in the cushion body 28, and the transmission surface 2 in the closure body 21
It is closely interposed between 1a and the receiving portion 15a of the inner flange 15. Next, 29 is a well-known fixed core,
Reference numeral 30 denotes a known movable iron core, and grooves 31, 31 for oil circulation are formed in the outer peripheral surface of the core in the axial direction (in the left-right direction in FIG. 1). 32 is a connecting pin, which is connected to a through hole 29a provided in the fixed iron core 29.
It is inserted through the pipe with a gap left through which oil can flow. Further, one end of the connecting pin 32 is opposed to the movable iron core 30, and the other end is opposed to the spool 4, respectively. 33, 34, and 35 are well-known oil leakage prevention O.
Showing the ring.

Next, the operation of the solenoid valve device having the above configuration will be explained.
When the coil 24 is energized through the lead 25, the magnetic flux generated by the coil 24 is transmitted to the cylindrical case 12, the yoke 26, the movable core 30, and the fixed core 2.
9. Passes through a magnetic path consisting of the main body 3 of the valve device, etc.
As a result, the movable core 30 is attracted toward the fixed core 29, resulting in a state as shown in FIG. As a result, the spool 4 is connected via the connecting pin 32.
are also moved in the same direction, and the oil flow path is switched as is well known. In this case, since the outer circumferential surface of the movable core 30 and the inner circumferential surface of the yoke 26 are opposed to each other via only the thin-walled portion 17b of the cylindrical body 17, the magnetic resistance there is relatively small, and therefore the movable core 3
The above-mentioned movement of 0 can be performed with a sufficiently large force.

Next, when the power to the coil 24 is cut off, the magnetic attraction force of the movable iron core 30 as described above disappears, and the spool 4 and the connecting pin 3 are moved by the action of the return spring 6b.
2. The movable core 30 is returned to the right in FIG.

On the other hand, when an electromagnet (similar to the electromagnet 2 described above) attached to the left side in FIG. 1 is activated for the valve device 1, the spool 4 is moved to the right side in FIG. The flow path is switched in a well-known manner.

In the above case or when the spool 4 is returned to the right by the return spring 6b, the movable core 30 moves toward the closure body 21 due to the force and may collide with it. However, in this case, the collision force when the movable iron core collides with the closure body 21 is transmitted from the transmission surface 21a of the closure body 21 to the transmission member 28a.
Since the collision force is applied to the receiving portion 15a of the inner flange 15 through the collision force, the receiving portion 15a receives the collision force. Therefore, almost no tensile force is applied to the thin wall portion 17b of the cylindrical body 17, thereby completely preventing the thin wall portion 17b from being cut or cracked.

Next, the assembly of the electromagnet 2 will be explained. First, the coil 24 is wound around the bobbin portion 20 of the inner frame 16 in a well-known manner. Thereafter, the yoke 26 is assembled to the inner frame 16, and the cushion body 28 is also assembled to the inner frame 16. Further, inside the inner frame body 16, the push pin 23 is inserted into the through hole 22 from the cylindrical body 17 side. Thereafter, the combination is inserted into the housing 11 from the left side in FIG. Furthermore, the movable iron core 30 and the fixed iron core 29 are sequentially assembled inside the inner frame body 16. In addition, when assembling both iron cores 30 and 29, the inner frame body 16 is inserted into the housing 1.
This may be done before inserting into 1. The electromagnet 2 is completed by the above operations.

As described above, in this invention, a hollow coil 24 is placed inside the cylindrical case 12, and a cylindrical body 17 into which oil can enter is placed in the hollow portion of the coil 24. At the same time, a movable iron core 30 is disposed within the cylinder, and the movable iron core 30 is attracted in one direction or retreated in the opposite direction depending on whether or not the coil is energized. When this electromagnet is operated, it has the advantage that any work (for example, valve switching) can be performed using the movement of the oil-immersed movable core 30.

Moreover, in this invention, in addition to the above structure, overhanging parts 18 and 19 that correspond to the external shape of the coil are integrally extended from a part of the outer peripheral surface of the cylinder 17. By forming the cylinder body 17
The outer circumferential surface of the cylindrical body 17 and the protruding parts 18 and 19 constitute a bobbin part 20 for holding the coil 24, and the movable iron core 3 is also formed in the cylinder body 17.
0 on the retreating direction side is closed by a closing body 21 integrally formed with the cylinder, and the closing body 21
A push pin 23 for manual operation of the movable core 30 is attached to the central part of the movable core 30 so as to be freely movable toward the movable core, while at the end of the case 12 on the backward side of the movable core, An inner flange 15 is attached to the closure body 21 and faces the movable iron core at a distance in the advancing and retreating direction,
Furthermore, there is a space between the closing body 21 and the inner flange 15, which transmits the collision force applied to the closing body when the movable iron core retreats and collides with the closing body to the inner flange 15. 15, the transmission member 28a is interposed to receive the collision force, so it has the effect of (a) above, and (b) the oil-immersed movable iron core 30 operates. However, in that case, the closed cylindrical body 17 can prevent oil from leaking, and there is an effect that the movable core 30 can be operated properly.

(c) Moreover, the cylinder 17 not only has the effect of preventing oil leakage but also has the effect of improving the workability of assembly. That is, by simply winding the coil 24 around the bobbin portion 20 and inserting the cylinder 17 with the push pin 23 attached to the closure body 21 into the case 12, (a) as well as assembling the cylinder 17, (b) Assembling the coil 24 and (c) assembling the push pin 23 can all be done at the same time, which has the effect of making it possible to provide the product at a low cost.

(d) Cylindrical body 1 having such various effects
In the case of manufacturing 7, the bobbin part 20 and the closure body 2
1 is integrally molded with the cylindrical body 17, so it is easy to manufacture, that is, it can be manufactured by means that can be mass-produced, such as plastic molding means, and it also has the effect of being able to be provided at a low cost.

(E) Moreover, even if the cylinder 17 can be formed inexpensively by integral molding, the movable iron core 30 that retreats
When receiving the force, the closing body 21 is simply subjected to compressive force, and the force of the collision of the movable core 30 is received by the inner flange 15 via the transmission member 28a. This has the effect of preventing this and making it possible to use the electromagnet for a long time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view of a solenoid valve device, and FIG. 2 is a right side view of FIG. 1. 12...Case, 24...Coil, 17...Cylinder, 30...Movable core, 18, 19...Protrusion part,
21... Obstruction body, 23... Pushpin, 15...
...Inner tsuba, 28a...Transmission member.

Claims (1)

[Scope of utility model registration request] A hollow coil is placed inside the cylindrical case, and a cylindrical body into which oil can enter is placed in the hollow part of the coil, and a movable iron core is disposed inside the cylindrical body. In an electromagnet that attracts the movable iron core in one direction or retreats in the opposite direction depending on whether or not the coil is energized, a part of the outer circumferential surface of the cylindrical body is formed so as to correspond to the outer shape of the coil. A protruding portion is integrally formed with the cylindrical body, and the outer peripheral surface of the cylindrical body and the protruding portion constitute a bobbin portion for holding the coil, and the movable portion is formed in the cylindrical body. The end of the iron core in the backward direction is closed by a closing body integrally formed with the cylinder, and a push pin for manual operation of the movable core is provided in the center of the closing body for moving the movable core toward the movable core. is freely attached to the cylindrical case, and an inner flange is attached to the end of the movable iron core on the retreating direction side of the cylindrical case, the inner flange facing the closing body at a distance in the advancing and retreating direction of the movable iron core. Moreover, there is a mechanism between the closing body and the inner flange, which transmits the collision force applied to the closing body when the movable iron core retreats and collides with the closing body to the inner flange. An electromagnet characterized in that an electromagnet is provided with a transmission member that absorbs the collision force.