JP3726202B2 - solenoid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solenoid mounted on a valve body and constituting a solenoid valve together with the valve body, and more particularly to a structure of a movable iron core and a fixed iron core of the solenoid.
[0002]
[Prior art]
Generally, an electromagnetic valve, which is a component of a hydraulic circuit or the like, is a pair of left and right solenoids (also referred to as electromagnet devices) having the same structure that operates the spool in a valve body in which a spool that opens and closes an oil passage and the like is built. It is configured by mounting.
[0003]
There are two types of solenoids, AC solenoids and DC solenoids, depending on the power source used, and AC solenoids have a specific problem of preventing the vibration of the movable iron core, while DC solenoids eliminate residual magnetism. Therefore, the movable iron core and the fixed iron core have different structures for the AC solenoid and the DC solenoid, respectively.
[0004]
[Problems to be solved by the invention]
In view of the above points, the present invention has been made for the purpose of making it possible to use at least the movable iron core in common in both the AC solenoid and the DC solenoid and to make the parts common.
[0005]
[Means for Solving the Problems]
A first solenoid according to the present invention is a solenoid in which a fixed iron core and a movable iron core are arranged to face each other, and a shading coil housing portion is provided on a surface of the movable iron core facing the fixed iron core, and the solenoid is used as an AC solenoid. In this case, an AC kuma coil is provided in the kuma coil housing portion so as to allow the opposed surface of the movable iron core and the opposed surface of the fixed iron core to be in close contact with each other. Is used as a DC solenoid, a DC kuma coil that has a height higher than that of the AC kuma coil that can prevent contact between the movable iron core facing surface and the stationary iron core facing surface is used as the kuma scraper. It is characterized by being housed in a coil housing part.
[0006]
The second solenoid of the present invention is a solenoid in which a fixed iron core and a movable iron core are arranged to face each other, and is provided with a bearer coil housing portion on a surface of the fixed iron core facing the movable iron core, and the solenoid is used as an AC solenoid. When used, it is configured by accommodating a bear coil for AC having a height that allows the opposed surface of the movable iron core and the opposed surface of the fixed iron core to be in close contact with each other, When the solenoid is used as a DC solenoid, a DC kuma coil having a height larger than the AC kuma coil that can prevent the contact between the movable iron core facing surface and the stationary iron core facing surface is provided. It is configured to be accommodated in the dark spot coil accommodating portion.
[0007]
The third solenoid according to the present invention is a solenoid in which a fixed iron core and a movable iron core are arranged to face each other, and a disposition coil housing portion is provided on one end surface of the movable iron core, and the solenoid is used as an AC solenoid. Is configured such that the darkening coil is housed in the darkening coil housing portion and the one end surface of the movable iron core is opposed to the facing surface of the AC fixed iron core, while the solenoid is used as a DC solenoid. Is characterized in that the other end surface of the movable iron core is opposed to the facing surface of the fixed iron core for DC without accommodating the darkening coil in the darkening coil housing portion.
[0008]
[Effects of the invention]
The first and second solenoids of the present invention are provided with a shading coil housing portion on the facing surface of the movable iron core or the facing surface of the fixed iron core. When the solenoid is used as an AC solenoid, the first and second solenoids are fixed to the movable iron core facing surface. An AC kuma coil that has a height that enables close contact with the iron core facing surface is housed in the kuma coil coil housing portion. On the other hand, when the solenoid is used as a DC solenoid, A DC kuma coil that can prevent close contact with the fixed iron core facing surface and has a height larger than that of the AC kuma coil is housed in the kuma coil housing portion.
[0009]
When the solenoid is used as an AC solenoid, the AC iron coil can prevent vibration of the movable iron core. On the other hand, when the solenoid is used as a DC solenoid, the DC iron coil is formed between the movable iron core and the fixed iron core. Residual magnetism can be reduced because it acts as a spacer that prevents adhesion.
[0010]
Therefore, according to the first and second solenoids of the present invention, the movable iron core and the fixed iron core can be used in common for the AC solenoid and the DC solenoid.
[0011]
Further, the third solenoid of the present invention is provided with a darkening coil housing portion on one end face of the movable iron core, and when the solenoid is used as an AC solenoid, the darkening coil housing portion houses the darkening coil. The one end surface of the movable iron core is configured to face the facing surface of the AC fixed iron core. On the other hand, when the solenoid is used as a DC solenoid, the movable iron core is movable without accommodating the decoy coil. The other end surface of the iron core is configured to face the facing surface of the DC fixed iron core.
[0012]
Therefore, according to the third solenoid of the present invention, the movable iron core can be used in common for the AC solenoid and the DC solenoid.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a sectional view of a solenoid according to the first embodiment (corresponding to the first solenoid of the present invention). This solenoid is a solenoid that is used in a solenoid valve that is a component of a hydraulic circuit or the like and is mounted on a valve body that has a built-in spool that opens and closes an oil passage and the like. One solenoid of a pair of solenoids (also referred to as electromagnet devices).
[0015]
The solenoid shown in FIG. 1 is a solenoid that can be used as both an AC solenoid and a DC solenoid, as will be described in detail later.
[0016]
The solenoid 1 of the first embodiment is a solenoid widely used for oil-immersed solenoid valves and the like. The solenoid 1 includes a coil assembly 2, a tube assembly 3, and a nut (fixing means) 4.
[0017]
The coil assembly 2 is indicated by a resin bobbin 21, a solenoid coil 22 wound around the bobbin 21, and a broken line arrow when the solenoid coil 22 is energized (when used as an AC solenoid as is well known). When used as a DC solenoid, it is indicated by a broken arrow in one direction.) A plurality of donut-shaped yokes 23 forming a part of the magnetic circuit MC and a part of the magnetic circuit MC are also shown. A hollow cylindrical magnetic body 24 to be formed, and a terminal pin 25 for taking current from the outside into the solenoid coil 22, and 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.
[0018]
The tube assembly 3 is inserted into the hollow portion of the bobbin 21 of the coil assembly 2. The tube assembly 3 includes a fixed iron core 31 having a male screw 31a screwed into a female screw formed in a valve body (not shown), a movable iron core (plunger) 32 that receives a magnetic attractive force from the fixed iron core 31 when the solenoid coil 22 is excited, A pipe 33 made of a non-magnetic material having one end welded to the fixed iron core 31 and the other end welded to the stopper 34 and slidably accommodated in the axial direction, and the upper end position of the movable iron core 32 in FIG. The stopper 34 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 performance. The manual operation pin 39 is for manually operating a spool (not shown) in the valve body through the movable iron core 32 and the push pin 35 by an external operation.
[0019]
On the surface 32a of the movable iron core 32 facing the fixed iron core 31, a bear coil receiving portion 32b for receiving the bear coil 32c or 32d is formed. When the solenoid 1 is used as an AC solenoid, the bear coil stored in the bear coil receiving portion 32b includes a movable iron core facing surface 32a and a facing surface 31c of the fixed iron core 31, as shown in FIG. When the solenoid 1 is used as a DC solenoid, as shown in FIG. 3, the movable iron core facing surface 32a and the fixed iron core are opposed to each other. It is constituted by a DC kuma coil 32d having a height higher than that of the AC kuma coil 32c, which can prevent close contact with the surface 31c.
[0020]
The nut (fixing means) 4 is a resin nut that is screwed into the male thread 34a of the stopper 34 of the tube assembly 3, and is used for fixing the coil assembly 2 to the valve body by integrating the tube assembly 3 and the coil assembly 2. It is done. That is, the coil assembly 2 is fixed to the valve body in such a manner that the male thread 31a of the fixed core 31 of the tube assembly 3 is screwed into the female thread of the valve body 3 and the coil assembly 2 is fitted on the outer peripheral surface of the tube assembly 3. The nut 4 is screwed into the male screw 34 a of the stopper 34 of the assembly 3, and the end surface of the resin case 26 of the coil assembly 2 is pressed against the end surface of the nut 4.
[0021]
The upper end surface of the push pin 35 is in contact with the lower end surface of the movable iron core 32. The push pin 35 passes through the vertical through hole 31b of the fixed iron core 31 and is a spool (not shown) of the valve body. Abut. When the solenoid coil 22 is demagnetized and the other solenoid (located on the opposite side of the solenoid shown in FIG. 4 and having the same structure as the solenoid shown in FIG. 4 across the valve body) is energized, the spool (Not shown) pushes the push pin 35 against the elastic force of a spring (not shown), and the movable iron core 32 is separated from the fixed iron core 31.
[0022]
As described above, the solenoid 1 according to the first embodiment (corresponding to the first solenoid of the present invention) is provided with the shading coil accommodating portion 32b on the facing surface 32a of the movable iron core 32, and the solenoid 1 is connected to the AC. When used as a solenoid, an AC kuma coil 32c having a height that enables the movable iron core facing surface 32a and the fixed iron core facing surface 31c to be in close contact with each other is housed in the kuma coil housing portion 32b. When the solenoid 1 is used as a DC solenoid, a DC bear having a height higher than that of the AC kuma coil 32c capable of preventing close contact between the movable iron core facing surface 32a and the fixed iron core facing surface 31c. The take-up coil 32d is housed in a bear-coil housing part 32b.
[0023]
When the solenoid 1 is used as an AC solenoid, vibration of the movable iron core 32 can be prevented by the AC kuma coil 32c. On the other hand, when the solenoid 1 is used as a DC solenoid, the DC kuma coil 32d is movable. Since it acts as a spacer that prevents the iron core 32 and the fixed iron core 31 from closely contacting each other, the residual magnetism can be reduced.
[0024]
Therefore, according to the solenoid 1 of the first embodiment, the movable iron core 32 and the fixed iron core 31 can be used in common for the AC solenoid and the DC solenoid.
[0025]
Note that the position where the bear coil receiving portion 32b is formed is not limited to the planar portion of the movable iron core facing surface 32a as shown in FIGS. 1 to 3, but as shown in FIG. It is good also as a front-end | tip corner part of 32 protrusion part 32e.
[0026]
FIG. 5 shows the configuration of the movable iron core and the fixed iron core in the solenoid according to the second embodiment (corresponding to the second solenoid of the present invention). Other configurations are the same as those of the first embodiment.
[0027]
In FIG. 5, a bear coil receiving portion 31 d is formed on the facing surface 31 c of the fixed iron core 31. When the solenoid is used as an AC solenoid, the AC kuma coil 31e having a height that allows the facing surface 32a of the movable iron core 32 and the stationary iron core facing surface 31c to be in close contact with each other is used as the kuma coil coil receiving portion 31d. On the other hand, when the solenoid is used as a DC solenoid, it is larger than the AC decoiling coil 31e that can prevent the contact between the movable iron core facing surface 32a and the fixed iron core facing surface 31c. A DC bear coil 31f having a thickness is housed in a bear coil housing portion 31d.
[0028]
Similarly to the first embodiment, the solenoid according to the second embodiment can prevent the movable iron core 32 from vibrating due to the AC decoiling coil 31e when the solenoid 1 is used as an AC solenoid. , The DC kuma coil 31f acts as a spacer that prevents the movable iron core 32 and the fixed iron core 31 from coming into close contact with each other. Therefore, the residual magnetism can be reduced, and the movable iron core 32 and the fixed iron coil 31 can be fixed. The iron core 31 can be used in common for the AC solenoid and the DC solenoid.
[0029]
6 and 7 show the configurations of the movable iron core and the fixed iron core in the solenoid according to the third embodiment (corresponding to the third solenoid of the present invention), and FIG. 6 shows the case where the solenoid is used as an AC solenoid. On the other hand, FIG. 7 corresponds to the case where the solenoid is used as a DC solenoid. Other configurations are the same as those of the first embodiment.
[0030]
6 and 7, the one end face 32 f of the movable iron core 32 is formed with a bear removing coil housing portion 32 g. Then, when the solenoid is used as an AC solenoid, as shown in FIG. 6, the bear coil 32h is housed in the bear coil receiving portion 32g, and one end face 32f of the movable iron core 32 is attached to the AC fixed iron core 31A. On the other hand, when the solenoid is used as a DC solenoid, as shown in FIG. 7, as shown in FIG. 7, the bearer coil 32 h is not housed in the bearer coil housing portion 32 g. The other end surface 32i is configured to face the facing surface 31h of the DC fixed iron core 31B. Here, a spacer 31i is fixed to the end face 31h of the DC fixed iron core 31B in order to prevent the end face 32i of the movable iron core 32 and the end face 31h of the fixed iron core 31 from sticking to each other and reduce residual magnetism. .
[0031]
Therefore, according to the solenoid of the third embodiment (corresponding to the third solenoid of the present invention), the movable iron core 32 can be commonly used for the AC solenoid and the DC solenoid.
[Brief description of the drawings]
FIG. 1 is a sectional view of a solenoid according to a first embodiment.
FIG. 2 is a configuration diagram of a movable iron core and a fixed iron core when the solenoid is used as an AC solenoid.
FIG. 3 is a configuration diagram of a movable iron core and a fixed iron core when the solenoid is used as a DC solenoid.
FIG. 4 is a cross-sectional view showing a modification of the formation position of the bear coil receiving portion in the first embodiment.
FIG. 5 is a configuration diagram of a movable iron core and a fixed iron core in a solenoid according to a second embodiment.
FIG. 6 is a configuration diagram of a movable iron core and a fixed iron core when the solenoid according to the third embodiment is used as an AC solenoid.
FIG. 7 is a configuration diagram of a movable iron core and a fixed iron core when the solenoid is used as a DC solenoid.
[Explanation of symbols]
31 Fixed Iron Core 31c Opposite Surface 31d Beared Coil Housing 31e AC Bearer Coil 31f DC Bearer Coil 31A AC Fixed Iron Core 31g Opposed Surface 31B DC Fixed Iron Core 31h Opposed Surface 32 Movable Iron Core 32a Opposed Surface 32b Beared Coil Housing portion 32c AC kuma coil 32d DC kuma coil 32f One end surface 32g kuma coil housing portion 32h kuma coil 32i The other end surface

Claims (3)

In the solenoid where the fixed iron core and the movable iron core are arranged opposite to each other,
Provide a bearer coil housing portion on the surface facing the fixed iron core of the movable iron core,
When the solenoid is used as an AC solenoid, an AC kuma coil having a height that allows the opposed surface of the movable iron core and the opposed surface of the fixed iron core to be in close contact with each other is housed in the kuma coil coil receiving portion. On the other hand, when the solenoid is used as a DC solenoid, it has a height higher than that of the AC kuma coil that can prevent close contact between the movable iron core facing surface and the fixed iron core facing surface. A solenoid comprising a bearer coil for DC housed in the bearer coil housing portion. In the solenoid where the fixed iron core and the movable iron core are arranged opposite to each other,
A bearer coil housing portion is provided on the surface facing the movable iron core of the fixed iron core,
When the solenoid is used as an AC solenoid, an AC kuma coil having a height that allows the opposed surface of the movable iron core and the opposed surface of the fixed iron core to be in close contact with each other is housed in the kuma coil coil receiving portion. On the other hand, when the solenoid is used as a DC solenoid, the DC having a height higher than that of the AC kuma coil that can prevent the movable core facing surface and the fixed core facing surface from being in close contact with each other. A solenoid comprising: a bear removing coil housed in the bear removing coil housing portion. In the solenoid where the fixed iron core and the movable iron core are arranged opposite to each other,
A bearer coil housing portion is provided on one end face of the movable iron core,
When using the solenoid as an AC solenoid, the bearer coil is received in the bearer coil housing portion and the one end surface of the movable iron core is opposed to the facing surface of the AC fixed iron core, When the solenoid is used as a DC solenoid, the other end surface of the movable iron core is configured to face the facing surface of the DC fixed iron core without accommodating the darkening coil in the darkening coil housing portion. Characteristic solenoid.

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