JPH1140414A - Moving-pin supporter of electromagnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moving-pin supporter of an electromagnet capable of moving the moving-pin pushing a spool of valve in a direction parallel to the pin shaft and lowering cost. SOLUTION: The moving pin supporter 13 comprises a fixed iron core 9, the moving-pin 14 placed movable in the fixed iron core 9, and two supporting washers 15 press-fitted in the fixed iron core 9 and supporting the moving-pin 14. Two concaves 91 and 92 are formed at both the ends of the fixed iron core 9 and a penetrating hole 93 is formed through the concaves 91 and 92. The supporting washers 15 having a supporting hole 15a and an oil path 15d are press-fitted in the concaves 91 and 92 respectively and the moving-pin 14 is placed movable in the penetrating hole 93 supported by the supporting washers 15 at both its ends. One end of the moving-pin 14 is contacted under pressure with a moving iron core 11 and the other end is contacted under pressure with a spool 41 of valve, and the spool 41 is moved under pressure along with the movement of the moving iron core 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet having a fixed iron core and a movable iron core, wherein a movable pin is connected between the movable iron core and a spool of a valve element, and a movable pin in an electromagnet for supporting the pin. It relates to a support device.

[0002]

2. Description of the Related Art Conventionally, an electromagnet has a bobbin formed in a hollow shape, a magnetic coil wound around the bobbin, a fixed iron core disposed in the bobbin, and a sliding member which is close to and separated from the fixed iron core. And a movable iron core to be moved, and is widely used as a hydraulic solenoid valve by being attached to a hydraulic valve body or the like. Then, by connecting a movable pin pressed from a movable iron core to a spool arranged in the valve body, the flow path of the hydraulic valve is released and hydraulically operated.

An electromagnet 20 shown in FIG. 1 is used as an oil immersion type in a hydraulic solenoid valve or the like.
0 denotes a coil assembly 21; a tube assembly 26 fitted into the coil assembly 21;
A nut 31 for fixing the tube assembly 1 and the tube assembly 26;
The coil assembly 21 is formed by integrally molding a hollow bobbin 24 in which a magnetic coil 23 is wound and a yoke 25 with a resin in a hollow round magnetic outer case 22 using a resin. 26 has a fixed iron core 27 and a movable iron core 28, and further has a fixed iron core 27 and a movable iron core 28.
, And a pipe 29 for fitting. The pipe 29 is formed of a ring-shaped non-magnetic material,
The movable core 28 which is engaged with and fixed to the fixed iron core 27 at one end and is slidably disposed on the inner circumferential surface of the movable core 28 is moved toward and away from the fixed iron core 27. A stopper 30 is welded to the other end of the pipe 29, and a nut 31 is screwed and attached to the stopper 30 in order to integrally fix the coil assembly 21 and the tube assembly 26.

A through hole 27a is formed in the fixed core 27 along the central axis, and the movable core 28 is formed in the through hole 27a.
The movable pin 33 that connects the spool 41 of the valve body 40 with the movable pin 33 is inserted. As shown in FIG. 6, the movable pin 33 is formed in an irregular shape having a round movable pin having a flat portion 33a with both sides chamfered, and an oil passage is formed between the flat portion 33a and the through hole 27a. You. Further, the fixed iron core 27 has a male screw 27b formed on the outer periphery of the distal end portion.
It is attached to the valve body 40 by b.

On the other hand, an oil groove 28a for circulating oil is formed in one or both of the outer peripheral surfaces of the movable core 28 in the axial direction, so that the oil flowing from the hydraulic valve 40 passes through the movable core 28. It was circulated to the stopper 30 side.
And a seal for preventing oil leakage was provided at a necessary place.

[0006]

However, the movable core 28
Since the movable pin 41 that slides with the frequent sliding of the movable pin 41 is supported by the through hole 27a of the fixed iron core 27, the gap formed between the movable pin 41 and the through hole 27a is This would hinder the parallel translation. This may cause an eccentric load to be applied to the movable iron core 28, preventing normal operation of the spool, and speeding up the wear of the movable pin 41. For this reason, if the fitting between the fitting hole 27a of the fixed core 27 and the movable pin 41 is strict, it takes time to process the fixed core and the cost is increased. Further, since the movable pin 41 connecting the movable iron core 28 and the spool 41 requires an oil passage and is formed in an irregular shape, the movable pin 41 is significantly higher than a commercially available standard price. On the other hand, as the demand for cost reduction from the user side increases, price competition intensifies, and the price of conventional electromagnets must be reviewed.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. By improving a device for supporting a movable pin that penetrates a fixed iron core, it is possible to stably support a movable pin without increasing costs. It is an object to provide a movable pin support device for an electromagnet.

[0008]

SUMMARY OF THE INVENTION A movable pin supporting device for an electromagnet according to the present invention is configured as follows to solve the above-mentioned problems. That is, a fixed core, a movable core disposed so as to approach and separate from the fixed core, a movable pin having one end connected to the tip of the movable core and the other end connected to a spool of a valve element, A movable pin support device for an electromagnet having the movable pin is formed in a round shape, and the movable pin is disposed so as to pass through a through hole formed in the fixed iron core in a loosely fitted state, A movable pin support member for supporting the movable pin at at least two places is provided on the fixed iron core, the movable pin support member having a pin support hole and an oil passage.

Preferably, the movable pin support member is formed in a disk shape, and has an annular portion and a plurality of convex portions formed to project from the annular portion. The distal end of the portion may be formed in a movable pin support device hole for supporting the movable pin, and an interval between each convex portion may be formed in an oil passage.

[0010] More preferably, the movable pin support member is formed in a disk shape having an annular portion and a movable pin support hole disposed in the annular portion, and the annular portion is A plurality of slit-shaped oil passages are formed through the annular portion.

The oil passage may be formed in a radial shape from the movable pin support hole toward the outer periphery.

Further, the oil passage may be formed along a circumferential direction at a position not in contact with the movable pin support hole.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the electromagnet 1 of the present embodiment
The outer case 3 includes a round outer case 3 and a tube assembly 5 disposed in the outer case 3.
The bobbin 6 includes a coil 7 arranged to wind the bobbin 6, and a fixed iron core 9 and a movable iron core 11 arranged in the bobbin 6. And the outer case 2 is the valve body 40
, A hydraulic solenoid valve is formed.

As shown in FIG. 2, the movable pin support device 13 includes a fixed iron core 9, a movable pin 14 slidably inserted into the fixed iron core 9, and a support washer 15 pressed into the fixed iron core 9. And is composed of

The fixed iron core 9 has recesses 91 and 92 formed at both ends, and a through hole 93 is formed along the axial direction. Further, on the outer peripheral edge of the rear end surface, a rib portion 94 is formed so as to protrude toward the movable iron core 11 over the entire circumference, so that residual magnetism is reduced when the attraction with the movable iron core 11 is released. The through hole 93 is formed to have a larger diameter than the movable pin 14, and serves as a passage for oil flowing from the valve body 40 through a gap formed between the through hole 93 and the movable pin 14. The support washers 15 are press-fitted into both ends of the through hole 93 in the recesses 91 and 92.

The support washer 15 supports both ends of the movable pin 14 and is formed in a disk shape having a support hole 15a at the center as shown in FIG. Three convex portions 15c (other than three, if more than three) are formed toward. Therefore, an oil passage 15d is formed between each of the protrusions 15c, and the tip surfaces of the three protrusions 15c form the support holes 15a. The support hole 15a is formed to have the same size as the outer diameter of the movable pin 14 so that the movable pin 14 can slide.

The movable pin 14 is formed in a round shape so that a commercially available pin can be used. One end of the movable pin 14 is in contact with and connected to the tip of the movable core 11, and the other end is connected to the rear end face of the spool 41 of the valve body 40. The two ends are slidably supported by a support washer 15 press-fitted into the fixed iron core 9 and abuttingly connected thereto. Therefore, the movable core 11 is attracted to the fixed core 9 by the excitation of the coil, and the movable pin 14 presses and moves the spool 41.

Note that the support washer 15 is not limited to
As shown in FIG. The support washer 15A shown in FIG. 4A includes a support hole 15a and an annular portion 15b disposed around the support hole 15a.
A plurality of slit-shaped oil passages 1
5e are formed radially, and oil from the valve element
e flows into the movable iron core 11 side.

Further, three washers 15B shown in FIG. 4B are provided along the circumferential direction in the annular portion 15b.
(Other than the individual oil passages) may be formed at positions that do not interfere with the support holes 15a. And
Oil from the valve body flows into the movable iron core 11 through the oil passage 15f.

When the above-mentioned movable pin support device 13 is mounted on an electromagnet, it is configured as shown in FIG. The electromagnet 1 shown in FIG. 1 is of a type in which a tube constituting a tube assembly 5 is formed of a bobbin 6. More specifically, the outer case 3 is formed of a magnetic material and has a front end (FIG. 2).
Tube assembly 5 having a flange portion 3a
And is closed with a rear wall 3c formed at a rear end (upper in FIG. 2) with a smaller diameter than the main body 3b, and is molded mainly by press working.

The bobbin 6 is formed of a non-magnetic material in a cylindrical shape, and has a front end opened and a rear end closed with a rear wall 6a. A pair of coil storage walls 61 and 62 are formed on the outer peripheral surfaces of the front end portion and the intermediate portion of the bobbin 6 so as to be outwardly received in the outer case 3. The coil 7 is wound and stored. A disk-shaped flange plate 63 is formed at the rear end side so as to be housed in the outer case 3 with an interval from the coil storage wall 62 on the rear side. 63
The lead wire 7a of the coil 7 is inserted into the gap 6b formed between
Is housed, and the flange plate 63 and the main body 3b of the outer case 2 are stored.
A yoke 12 is disposed along the outer peripheral surface of the bobbin 6 between the yoke 12 and the rear end surface.

A stopper 64 is formed inside the rear wall 6a of the bobbin 6 so as to protrude inward. The area is reduced.

Further, on the inner peripheral surface of the bobbin 6, a first fitting surface 65 that fits with the fixed iron core 9 is formed on the front end side, and is connected to the first fitting surface 65 and is formed on the rear end side. A second fitting surface 66 to which the movable iron core 11 is fitted is formed. And the first
The fitting surface 65 is formed to have a larger diameter than the second fitting surface 66, and the fixed core 9 is positioned by the rear end surface of the fixed core 9 abutting the front end surface of the second fitting surface 66.

A plurality of slit-shaped oil grooves are formed in the second fitting surface 66 of the bobbin 6 along the axial direction to form an oil passage. Only one oil groove may be formed, or a plurality of oil grooves may be formed at equal intervals.

The movable core 11 is formed in a round shape so as to be slidably fitted to the second fitting surface 66 of the bobbin 6 as described above, and engages with the concave portion 92 of the fixed core 9 on the front end surface. A convex portion 11a is formed. Then, the coil 7 is attracted to the fixed iron core 9 by excitation, and the coil 7 is released from excitation, thereby sliding toward the rear wall 6a of the bobbin 6 by the biasing force of the spring.

The electromagnet 1 is connected by attaching the flange portion 3a of the outer case 3 to the valve body 40 with the movable pin 14 abutting one end on the distal end surface of the movable core 11 and the other end on the rear end surface of the spool 41. It is arranged to make it. When the coil 7 is excited, the fixed iron core 9, the movable iron core 11, the yoke 1
2. A magnetic field is generated in the outer case 3, and the movable core 11 moves in a direction to be attracted to the fixed core 9, and
Is engaged with the convex portion 11a of the movable iron core 11. Movable iron core 1
As the movable pin 14 moves, the movable pin 14 is supported in the through hole 93 of the fixed iron core 9 by the support washers 15
In the direction of pressing (downward in FIG. 2). At this time, the oil that has flowed in from the valve body 40 side is supplied into the bobbin 6 from the spool 41 side through the oil passages 15 d and 15 d of the support washer 15 and the through hole 93 of the fixed iron core 9. Further, the oil that has flowed into the second fitting surface 66 of the bobbin 6 lubricates the sliding surface of the movable core 11 through the oil groove and flows into the rear of the movable core 11. Since the movable pin 14 is supported by the support washers 15 at both ends thereof, the movable pin 14 is moved substantially in parallel without undulating with respect to the axis, and does not apply an eccentric load to the movable iron core 11 and normally operates the spool 41. . Moreover, wear of the movable pin 14 itself is reduced.

When the excitation of the coil 7 is released, the magnetic field is demagnetized between the fixed core 9 and the movable core 11, so that the coil spring 1 locked between the fixed core 9 and the spool 41
8 (actually, in the case of a double solenoid valve, a spring disposed at the same position on the opposite side of the spool 41 of the solenoid valve 1), the movable core 11 is fixed to the fixed core 9 via the movable pin.
Will move away from the camera. Movable iron core 11
Is a rear wall 6a of the bobbin 6 from a position where the bobbin 6 is attracted to the fixed iron core 9.
Is returned to a position where it comes into contact with the stopper portion 64 of FIG.

As described above, in the above embodiment, the movable pin supporting device 13 of the movable electromagnet is mounted on the electromagnet 1 having the tube formed on the bobbin 6.
It may be attached to another electromagnet. For example, the tube may be formed in a cylindrical pipe disposed in the bobbin 6, or may be a conventional type of electromagnet shown in FIG. Further, the oil groove formed in the tube has a plurality of slits provided in the bobbin 6 in the case of the above-described embodiment, but a plurality of ribs that fit with the movable iron core may be formed in the tube. Alternatively, instead of forming an oil groove in the tube, an oil groove may be formed in the movable iron core.

[0030]

According to the present invention, there is provided a movable pin supporting device for an electromagnet, comprising: a fixed iron core; a movable iron core disposed so as to be close to and away from the fixed iron core; A movable pin, the other end of which is connected to a spool of the valve body, and which is disposed to support the movable pin, wherein the movable pin is formed in a round shape, The movable pin is disposed so as to freely pass through a through hole formed in the fixed core, and a movable pin supporting member that supports the movable pin at at least two places is provided in the fixed core. And an oil passage. Then, when the movable core moves so as to be attracted to the fixed core by excitation of the coil,
The movable pin, which moves integrally with the movable core, moves in the through hole of the fixed core while being supported by a support washer pressed into the fixed core. Since the movable pin is supported by two supporting washers at both ends thereof, the movable pin is moved substantially in parallel to the axis, so that the movable core is operated normally without applying an eccentric load to the movable iron core. Pin wear is also reduced. Further, since the movable pin is formed in a round shape, a commercially available pin can be used as it is, and the cost can be reduced.

Further, the movable pin support member is formed in a disk shape, and has an annular portion and a plurality of convex portions formed so as to project from the annular portion. The tip is formed to support the movable pin,
The movable pin support member has an annular portion and a pin support hole disposed inside the annular portion, is formed in a disk shape, and a plurality of slits are formed in the movable pin support hole. As long as the oil passage is formed, the pin supporting member can be manufactured at low cost by pressing.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an electromagnet equipped with a movable pin support device according to one embodiment of the present invention.

FIG. 2 is a schematic view showing the movable pin support device in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a plan view showing another embodiment of the support washer of FIG. 3;

FIG. 5 is a front sectional view showing a conventional electromagnet.

FIG. 6 is a sectional view showing the movable pin of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electromagnet 3 ... Outer case 3 ... Body part 5 ... Tube assembly 6 ... Bobbin (tube) 7 ... Coil 9 ... Fixed iron core 91, 92 ... Concave 93 ... Through hole 11 ... Movable iron core 13 ... Movable pin support device 14 ... Movable Pin 15, 15A, 15B Support washer 15a Support hole 15b Annular part 15c Convex part 15d Oil groove 15e, 15f Oil passage 40 Valve element 41 Spool

Claims (5)

[Claims] 1. A fixed iron core, a movable iron core disposed so as to approach and separate from the fixed iron core, one end is connected to a tip end of the movable iron core, and the other end is connected to a spool of a valve body. A movable pin, wherein the movable pin is formed in a round shape and the movable pin is formed in the fixed iron core. A movable pin support member that supports the movable pin at at least two places is provided on the fixed iron core, the movable pin support member having a pin support hole and an oil passage. A movable pin support device for an electromagnet. 2. The movable pin support member is formed in a disk shape, and has an annular portion and a plurality of convex portions formed so as to protrude from the annular portion. 2. The movable pin supporting device for an electromagnet according to claim 1, wherein a distal end portion is formed in a movable pin supporting device hole for supporting the movable pin, and a space between each convex portion is formed in an oil passage. 3. The movable pin support member is formed in a disk shape having an annular portion and a movable pin support hole disposed inside the annular portion. The movable pin support device for an electromagnet according to claim 1, wherein a plurality of slit-shaped oil passages are formed through the annular portion. 4. The movable pin support device for an electromagnet according to claim 3, wherein the oil passage is formed in a radial shape from the movable pin support hole toward the outer periphery. 5. The movable pin support device for an electromagnet according to claim 3, wherein the oil passage is formed along a circumferential direction at a position not in contact with the movable pin support hole.