JP3489074B2 - 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 and a fixed iron core, in which the movable iron core is slidably arranged by exciting a coil.

[0002]

2. Description of the Related Art Conventionally, a solenoid having a movable iron core and a fixed iron core, in which the movable iron core is slidably arranged by exciting a coil, has a small stroke (about 10 mm or less). The movable iron core is used as a hydraulic electromagnetic valve or a pneumatic electromagnetic valve by attaching the tip end side to a valve body, or is used as a stopper of a conveying device by utilizing the moving in / out of the movable iron core. A large stroke (about 40 mm or more) is used as an electromagnetic lock device for preventing a fall in a multi-storey parking lot.
In solenoids used for solenoid valves and the like, the tip of a fixed iron core is often attached to the valve body, and the solenoid used as an electromagnetic lock device for preventing fall in a multilevel parking lot supports a movable iron core. Plates are often attached to stanchions in parking lots.

The conventional solenoid shown in FIG. 4 is used in an electromagnetic lock device for preventing a fall in a multi-storey parking lot. The solenoid 41 is made of a resin material and has a protrusion 42a on a part of its outer peripheral surface. Formed substantially cylindrical body case 42
And a flange type mounting bracket 43 which is mounted on the main body case 42 with a bolt through a packing (not shown) as a housing.

A bobbin 45, which is hollow and has a coil 44 wound therein, and a bobbin 45 in the main body case 42.
A fixed iron core 47 housed inside and fixed to the body case 42
And a movable iron core 48 that is attracted to the fixed iron core 47 while being guided by the mounting bracket 43 and the bobbin 45 by the excitation of the coil 44.

A coil 44 is provided on the outer peripheral surface of the bobbin 45.
An outer case 52 made of a magnetic material which protects the magnetic circuit and constitutes a magnetic circuit is arranged, and a micro switch (position detection member) 53 is attached to the inside of the protrusion 42a in the main body case 42 through a metal fitting, and the protrusion 42a is connected to the outside. Towards the coil 44
And the lead wire of the micro switch 53 is wired.

The movable iron core 48 constitutes a magnetic flux circuit by exciting a shaft portion 49 slidable on the mounting bracket 43, a stopper portion 50 having a larger diameter than the shaft portion 49 and capable of contacting the mounting bracket 43, and the coil 44. The stopper portion 50 is formed with an inclined surface 51a on the magnetic pole portion 51 side so as to have a smaller diameter toward the magnetic pole portion 51 side.
When the movable iron core 48 moves, the main body case 42
The inclined surface 51a is brought into contact with the roller (detection portion) 53a of the micro switch 53 arranged in the protruding portion 42a to operate the micro switch 53. The roller 53a is arranged on the microswitch 53 via a lever.

In this type of solenoid, since the stroke of the movable iron core 47 is large, the fixed iron core 47 has a tapered male portion 47a and the movable iron core 48 has a tapered female portion 48a. . Then, when the movable iron core 48 starts to be attracted to the fixed iron core 47, the magnetic flux flows on the respective tapered surfaces.

[0008]

However, in the solenoid industry, there is a demand to provide the price at a low price. Therefore, it remains a major problem to review the configuration of the conventional solenoid to reduce the cost of the solenoid. It had been. In the above-mentioned conventional solenoid 41, in order to secure a space for disposing the micro switch 53,
The protrusion 42a is formed in a part of the body case 42, and in order to manufacture the body case 42 at a low cost, the body case 42 including the protrusion 42a is integrally formed by resin molding. This solenoid 41 has a coil 44
An outer case 52 that protects the magnetic field and forms a magnetic circuit
However, since it is arranged around the outer periphery of the coil 44, the case has a double structure. Therefore, it has been considered to reduce the cost by reviewing the position of the micro switch 53.

It is an object of the present invention to provide a solenoid whose cost is reduced except for the main body case which is resin-molded by disposing the mounting position of the micro switch on the bobbin in view of the above points.

[0010]

In a solenoid according to the present invention, a hollow bobbin, a coil wound around the bobbin, an outer case formed so as to protect the outer circumference of the coil, and the outer A mounting plate disposed on one end side of the case, a rear wall disposed on the other end side of the outer case, a fixed iron core fixed to the rear wall and attached to a hollow portion of the bobbin, And a movable iron core slidably disposed in the hollow portion of the bobbin, wherein the bobbin has two wall portions arranged side by side on the outer peripheral surface of the bobbin. and it is formed so as to dispose the sensor container, together with the coil to the coil receiving portion is wound, detection sensor for detecting the position of the movable core in the sensor housing portion is disposed, the sensor Has a contact-type detector
At the same time, a tapered surface is formed on a part of the outer peripheral surface of the movable core.
And the detection unit slides on the tapered surface.
It is also characterized in that the position of the movable iron core is detected.
Of.

A solenoid according to the present invention
Is a hollow bobbin and a coil wound around the bobbin
And an outer casing formed to protect the outer circumference of the coil.
And a mounting plate disposed on one end side of the outer case,
The rear wall disposed on the other end side of the outer case and the rear wall
A fixed iron core that is fixed and mounted in the hollow part of the bobbin.
The mounting plate and the hollow part of the bobbin so that they can slide.
And a movable iron core that is installed on the bobbin.
However, it has two wall portions arranged side by side on the outer peripheral surface and has a coil storage portion.
And the coil is formed so as to dispose the sensor storage portion.
The coil is wound around the storage portion and the sensor
A detection sensor for detecting the position of the movable iron core is arranged in the storage section.
And the detection sensor has a contact-type detection unit.
In addition, the pressing that presses the detection unit against a part of the movable iron core.
Sections are arranged, and the pressing section presses the detection section.
The position of the movable iron core is detected by
It is something.

[0012]

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

An improved form of solenoid 1 is shown in FIG.
As shown in FIG. 2, a cylindrical outer case 2 and a disc-shaped rear wall 3 fixed to one end of the outer case 2 via a retaining ring 2 a.
And a mounting plate 4 fixed to the other end of the outer case 2 to form a main body case, and the rear case 3 and the mounting plate 4 come into contact with the opposite surfaces of the outer case 2 inside. A hollow bobbin 6 is arranged.

The mounting plate 4 is a shaft portion 4 which is fitted to a member to be mounted.
a and the flange portion 4 attached to the attachment surface of the attached member
b, and the inside is formed in a hollow shape. Bobbin 6
Wall portions 6a and 6b that rise further outward from the outer peripheral surface are formed at two locations on the tip end side (mounting plate side) and the intermediate portion, and the coil is housed between the wall portions 6a and 6b. A sensor storage portion 8 is arranged between the portion 7, the wall portion 6b and the rear end 6c. A coil 10 is wound around the coil housing portion 7, and a micro switch 11 as a position detecting sensor is attached to the sensor housing portion 8 on a rib 8a formed in the sensor housing portion 8 along the axial direction. .

A fixed iron core 13 and a movable iron core 15 are arranged in the hollow portion of the bobbin 6 so as to face each other. The fixed iron core 13 has a thin wall-shaped outer peripheral wall 13b formed around the concave portion 13a on the front end side (a surface facing the movable iron core 15), and the rear end side is fixed to the rear wall 3. A buffer member 19 made of synthetic rubber is arranged in the recess 13a of the fixed iron core 13, and serves as a buffer when the movable iron core 15 is attracted to the fixed iron core 13. Recess 13a of buffer member 19
One end of the return spring 20 of the movable iron core 15 is supported by the flange portion attached to the bottom surface of the.

The movable iron core 15 has a shaft portion 16 and a suction portion 17. The shaft portion 16 is slidably fitted in the hollow portion of the mounting plate 4 via a bearing, and the rear portion of the shaft portion 16 is provided. The stepped projection 16a is formed on the outer peripheral part of the outer periphery of the mounting plate 4, and the sliding end of the movable iron core 15 is positioned by contacting the inner end surface of the mounting plate 4 via the buffer member 21. The adsorbing portion 17 has a tapered surface 17a formed on the outer peripheral surface so as to have a smaller diameter toward the fixed iron core 13 side, and has a concave portion 17b for inserting the outer peripheral surface of the fixed iron core 13 on the inner peripheral surface. Further, the bottom surface of the recess 17 b is provided with the other end of the return spring 20 arranged in the recess 13 a of the fixed iron core 13 so that the movable iron core 1 is
5 is arranged to be pressed.

The sliding stroke of the movable iron core 15 is set to about 50 mm, and the rear end surface of the suction portion 17 (on the side of the fixed iron core 13).
The sliding start end position is located at a position slightly intruding into the fixed iron core 13 side from the tip end surface of the fixed iron core 13 by the urging force of the return spring 20, and when the coil 10 is attracted to the fixed iron core 13 side, The slide end position of the rear end face of the portion 17 reaches a position near the rear wall 3.

Further, in the micro switch 11 attached to the sensor housing portion 8 of the bobbin 2, the roller portion 11b is moved toward the outer peripheral surface side of the fixed iron core 13 via a lever having one end fixed to the main body portion 11a. The movable core 15 is arranged and is located in front of the end position of the rear end surface of the suction portion 17 of the movable iron core 15. Therefore, the fixed iron core 1 of the movable iron core 15
When moved to the 3 side by suction, the taper surface 17a of the suction portion 17 causes the roller portion 11b of the microswitch 11 to move to the main body portion 11a.
It will be pushed and moved toward the side.

The solenoid 1 constructed as described above is
At the normal position where the coil 10 is not excited, the shaft portion 16 of the movable iron core 15 is moved forward of the mounting plate 4 (leftward in FIG. 1), and the suction portion 17 is, as described above, the outer peripheral wall 13b of the fixed iron core 13. Covers slightly. When the coil 10 is excited, the outer case 2, the rear wall 3, the fixed iron core 13, the movable iron core 1
5. A magnetic circuit is formed on the mounting plate 4, and a magnetic flux flows between them, so that the movable iron core 15 is attracted to the fixed iron core 13 and slides in the bobbin 6. At this time, the movable iron core 15
At the sliding start end position, the magnetic flux flows between the outer peripheral wall 13b of the fixed iron core 13 formed in a thin shape and the attraction portion 17 of the movable iron core 15 slightly covering the outer peripheral wall 13b. The more the suction portion 17 moves toward the fixed core 13, the thicker the suction portion 17 formed in the tapered shape becomes, so that more magnetic flux flows and further moves toward the fixed core 13.

When the rear end of the attracting portion 17 of the movable iron core 15 approaches the rear wall 3, as shown in FIG. 2, the taper surface 17a on the outer periphery of the attracting portion 17 presses the roller portion 11b of the microswitch 11 and gradually becomes the main body. It moves to the part 11a side and turns on the microswitch 11. When the position of the movable iron core 15 is detected by the micro switch 11, the signal is sent to the control device to perform the next operation in the system in which the solenoid is attached. For example, if it is used in a pallet fall prevention system in a parking lot, the shaft portion 15a of the movable iron core 15
Is drawn into the main body case of the solenoid 1, and the operation of lowering the pallet is performed.

Next, when the coil 10 is de-excited, the magnetic flux is demagnetized and the return spring 20 slides the movable iron core 15 away from the fixed iron core 13 so that the shaft portion 17a moves outward from the mounting plate 4. Will be issued.

In this way, by forming the coil housing 7 and the sensor housing 8 in the bobbin 6 and attaching the micro switch 11 for detecting the position of the movable iron core 15 to the sensor housing 8, the conventional resin can be used. The inside of the solenoid can be protected only by the outer case that forms the magnetic circuit without the main body case formed with, and the metal fittings for attaching the microswitch can be omitted, and the cost is reduced. Can be provided.

The solenoid is used as a solenoid with a large stroke for preventing a fall in a parking lot and as a solenoid with a short stroke.

A solenoid 31 shown in FIG. 3 shows another embodiment of the present invention, and shows a case where the shapes of the fixed core and the movable core are the same as those of the conventional solenoid. The same parts as those in the above embodiment are designated by the same reference numerals. Fixed iron core 33
Has a male portion 33a formed in a tapered shape such that its diameter becomes smaller toward the movable iron core 35 side, and the movable iron core 35 has a tapered female portion 35a that engages with the male portion 33a of the fixed iron core 33. To approach and separate from the fixed iron core 33. further,
The movable core 35 includes a shaft portion 36, a sensor pressing portion 37, and a suction portion 3.
8, the shaft portion 36 slides in and out of the inner peripheral portion of the mounting plate 4, and the sensor pressing portion 37 has a larger diameter than the shaft portion 36 and is formed on the rear surface. Shaped pressing part 3
7a presses the roller portion 11b of the micro switch 11 attached to the rib 8a of the sensor housing portion 8, and the above-mentioned recess 35a is formed in the suction portion 38.

Therefore, when the movable iron core 35 moves toward the fixed iron core 33, the pressing portion 37a of the sensor pressing portion 37 of the movable iron core 35 presses the roller portion 11b,
The micro switch 11 is operated.

In any of the embodiments, the detection sensor for detecting the position of the movable iron core is not limited to the micro switch, and another sensor, for example, a proximity switch may be attached to the sensor housing portion 8 of the bobbin 6. . In the case of a proximity sensor, the suction part 17 of the movable iron core 15 (or 35)
(Or 38) When the rear end of the movable core approaches the proximity sensor, the position of the movable core is detected. In addition, the sensor
It may be an optical sensor that projects light.

The shapes of the fixed iron core and the movable iron core are not limited to those described above, and other known ones may be used. Further, even in the case where the stroke of the movable iron core is small, the bobbin is formed with the coil housing portion and the sensor housing portion. The same effect can be achieved by detecting the position detection sensor attached to the sensor housing by the detection piece provided on the movable iron core.

[0029]

According to the present invention, a solenoid has a hollow bobbin, a coil wound around the bobbin, an outer case formed to protect the outer circumference of the coil, and one end of the outer case. Side mounting plate, a rear wall disposed on the other end side of the outer case, a fixed iron core fixed to the rear wall and mounted in the hollow portion of the bobbin, the mounting plate, and A movable iron core slidably disposed in the hollow portion of the bobbin, and the bobbin has two wall portions arranged side by side on the outer peripheral surface thereof, and has a coil accommodating portion and a sensor accommodating portion. A coil is wound around the coil housing portion, and a detection sensor for detecting the position of the movable iron core is arranged in the sensor housing portion. As a result, it is possible to omit the resin-made main body case that protects the inside of the solenoid that has been conventionally arranged, and to eliminate the mounting bracket for the detection sensor, thereby providing a cost-reduced solenoid. .

Further, the detection sensor has a contact type detection portion, a taper surface is formed on a part of the outer peripheral surface of the movable iron core, and the detection portion slides on the tapered surface to move the movable iron core. Since it is configured to detect the position of, it can be used as a solenoid having a long stroke specification.

Further, the detection sensor has a contact type detection part, and a pressing part for pressing the detection part is arranged on a part of the movable iron core, and the pressing part presses the detection part, whereby Even if it is configured to detect the position of the movable iron core, it can be used for a solenoid having a long stroke.

[Brief description of drawings]

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

FIG. 2 is a front sectional view showing an operating state of the micro switch of the solenoid of FIG.

FIG. 3 is a front sectional view showing a solenoid of another form.

FIG. 4 is a front sectional view showing a conventional solenoid.

[Explanation of symbols]

1 ... Solenoid 2 ... Outer case 3 ... rear wall 4 ... Mounting plate 6 ... Bobbin 6a, 6b ... Outer peripheral wall 7 ... Coil compartment 8 ... Sensor storage 10 ... Coil 11 ... Micro switch (detection sensor) 13 ... Fixed iron core 15 ... Movable iron core 17 ... Adsorption part 17a ... Tapered surface

Claims (2)

(57) [Claims] 1. A hollow bobbin, a coil wound around the bobbin, an outer case formed so as to protect the outer circumference of the coil, and a mounting plate disposed on one end side of the outer case. And a rear wall disposed on the other end side of the outer case,
A fixed iron core fixed to the rear wall and mounted in the hollow portion of the bobbin; and a movable iron core slidably disposed in the hollow portion of the mounting plate and the bobbin. A bobbin is formed so as to have a coil housing portion and a sensor housing portion having two wall portions arranged side by side on the outer peripheral surface, and the coil is wound around the coil housing portion,
A detection sensor for detecting the position of the movable iron core is provided in the sensor housing portion, and the detection sensor has a contact-type detection portion, and
A taper surface is formed on a part of the outer peripheral surface of the movable core.
The moving part can be moved by sliding on the tapered surface.
A solenoid that detects the position of the iron core. 2. A hollow bobbin and a bobbin wound around the bobbin.
Formed to protect the coil and the outer circumference of the coil
And an outer case disposed on one end side of the outer case
A mounting plate and a rear wall disposed on the other end side of the outer case,
It is fixed to the rear wall and mounted in the hollow part of the bobbin.
Sliding the fixed core and the hollow part of the mounting plate and the bobbin
And a movable iron core that is arranged so that the bobbin has two wall portions arranged side by side on the outer peripheral surface.
It is formed so as to dispose an il storage part and a sensor storage part, and the coil is wound around the coil storage part,
Detection for detecting the position of the movable iron core in the sensor housing
A sensor is provided, the detection sensor has a contact type detection unit, and
A pressing part for pressing the detecting part is arranged on a part of the movable iron core.
And the pressing unit presses the detection unit.
Soleno characterized by detecting the position of the movable iron core
Id.