JP3752648B2 - Movable pin support device in electromagnet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a movable pin support device in an electromagnet that has a fixed iron core and a movable iron core, a movable pin is connected between the movable iron core and a spool of a valve body, and supports the pin.
[0002]
[Prior 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 movable iron core that is slidably moved away from the fixed iron core. 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 the movable iron core to a spool disposed in the valve body, the flow path of the hydraulic valve is released and hydraulically operated.
[0003]
The electromagnet 20 shown in FIG. 5 is used as a hydraulic solenoid valve or the like, particularly as an oil immersion type. The electromagnet 20 includes a coil assembly 21, a tube assembly 26 fitted in the coil assembly 21, and a coil. The coil assembly 21 includes a nut 31 that fixes the assembly 21 and the tube assembly 26. The coil assembly 21 is a hollow bobbin 24 in which a magnetic coil 23 is wound in an outer case 22 of a hollow round magnetic body. And the yoke 25 are integrally formed of resin, and the tube assembly 26 includes a fixed iron core 27 and a movable iron core 28, and further includes a pipe 29 that fits the fixed iron core 27 and the movable iron core 28. Has been. The pipe 29 is formed of a ring-shaped non-magnetic material and is inserted into the inner peripheral surface of the hollow portion of the bobbin 24. One end of the pipe 29 is engaged with and welded to the fixed iron core 27. The movable iron core 28 is slidably disposed. Further, a stopper 30 is welded to the other end of the pipe 29, and a nut 31 is screwed into the stopper 30 and attached in order to fix the coil assembly 21 and the tube assembly 26 together.
[0004]
A through hole 27a is formed in the fixed iron core 27 along the central axis, and a movable pin 33 that connects the movable iron core 28 and the spool 41 of the valve body 40 is inserted into the through hole 27a. As shown in FIG. 6, the movable pin 33 is formed in a deformed shape having a round movable pin having a flat surface portion 33 a chamfered on both sides, and a space between the flat surface portion 33 a and the through hole 27 a is formed as an oil passage. The Further, the fixed iron core 27 is formed with a male screw 27b on the outer periphery of the tip portion, and is attached to the valve body 40 by the male screw 27b.
[0005]
On the other hand, the movable iron core 28 is formed with an oil groove 28a in the axial direction for circulating oil on one side or both sides of the outer peripheral surface, so that the oil flowing from the hydraulic valve 40 passes through the movable iron core 28 and is on the stopper 30 side. It was circulated until. And the seal | sticker for oil leakage prevention was arrange | positioned in the required location.
[0006]
[Problems to be solved by the invention]
However, since the movable pin 41 that slides with frequent sliding of the movable iron core 28 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 will prevent an accurate parallel movement of the movable pin 41. This applies an offset load to the movable iron core 28, which may prevent normal operation of the spool, and accelerates the wear of the movable pin 41. Therefore, if the fitting between the fitting hole 27a of the fixed iron core 27 and the movable pin 41 is made strict, it takes time to process the fixed iron core, which increases the cost. Furthermore, since the movable pin 41 that connects the movable iron core 28 and the spool 41 requires an oil passage, the movable pin 41 is formed in an irregular shape, so that 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 becomes stronger, the price competition becomes fierce, and it has become necessary to review the price of conventional electromagnets.
[0007]
SUMMARY OF THE INVENTION The present invention solves the above-described problems, and improves the movable pin supporting device that penetrates the fixed iron core, so that the movable magnet can be supported stably without increasing the cost. An object is to provide a pin support device.
[0008]
[Means for Solving the Problems]
The movable pin support device in the electromagnet according to the present invention is configured as follows in order to solve the above-described problems. That is,
A fixed iron core, a movable iron core disposed so as to be close to and away from the fixed iron core, and a movable pin having one end connected to the tip of the movable iron core and the other end connected to the spool of the valve body. A movable pin support device in an electromagnet for supporting the movable pin,
The movable pin is formed in a round shape, and the movable pin is disposed so as to penetrate in a loosely fitted state through a through hole formed in the fixed iron core,
A movable pin support member that supports the movable pin in at least two places is disposed on the fixed iron core with a pin support hole and an oil passage ,
The movable pin support member is formed in a disc shape, and has an annular portion and a plurality of convex portions formed so as to protrude from the annular portion, and a distal end portion of the convex portion is movable. It is formed in the movable pin support hole which supports a pin, and between each convex part is formed in the oil path, It is characterized by the above-mentioned.
[0009]
Further, the movable pin support device in the electromagnet according to the present invention includes a fixed iron core, a movable iron core disposed so as to approach and separate from the fixed iron core, and one end connected to the tip of the movable iron core. A movable pin connected to the spool of the valve body, and a movable pin support device in an electromagnet for supporting the movable pin,
The movable pin is formed in a round shape, and the movable pin is disposed so as to penetrate in a loosely fitted state through a through hole formed in the fixed iron core,
A movable pin support member that supports the movable pin in at least two places is disposed on the fixed iron core with a pin support hole and an oil passage,
The movable pin support member has an annular part and a movable pin support hole arranged inside the annular part and is formed in a disk shape, and a plurality of slit-like shapes are formed in the annular part. An oil passage is formed through the annular portion .
[0011]
Further, the oil passage may be formed in a radial shape from the movable pin support hole toward the outer peripheral direction.
[0012]
Furthermore, the oil passage may be formed along a circumferential direction at a position not in contact with the movable pin support hole.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0014]
As shown in FIG. 1, the electromagnet 1 of this embodiment includes a round outer case 3 and a tube assembly 5 disposed in the outer case 3. The tube assembly 5 includes a bobbin 6 and a bobbin 6. The coil 7 is arranged so as to be wound, and the fixed iron core 9 and the movable iron core 11 are arranged in the bobbin 6. A hydraulic solenoid valve is configured by attaching the outer case 2 to the valve body 40.
[0015]
As shown in FIG. 2, the movable pin support device 13 includes a fixed iron core 9, a movable pin 14 that is slidably inserted into the fixed iron core 9, and a support washer 15 that is press-fitted into the fixed iron core 9. It is configured.
[0016]
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. In addition, a rib portion 94 is formed on the outer peripheral edge of the rear end surface so as to protrude toward the movable iron core 11 over the entire circumference, so that residual magnetism is reduced when the attracting 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 side through a gap formed between the through hole 93 and the movable pin 14. The support washer 15 is press-fitted into both end portions of the through hole 93 in the recesses 91 and 92.
[0017]
The support washer 15 supports both end portions of the movable pin 14 and is formed in a disk shape having a support hole 15a at the center as shown in FIG. 3, from the annular portion 15b toward the support hole 15a. Three (if it is plural, other than three) convex portions 15c are formed. Accordingly, the oil passage 15d is formed between the respective convex portions 15c, and the tip surfaces of the three convex portions 15c form the support holes 15a. Further, the support hole 15a has substantially the same size as the outer diameter of the movable pin 14, and is formed so that the movable pin 14 can slide.
[0018]
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 contacts and is connected to the tip of the movable core 11, and the other end contacts the rear end surface of the spool 41 of the valve body 40. It is arranged so that both ends thereof are slidably supported by a support washer 15 which is connected and press-fitted into the fixed iron core 9. Therefore, the movable iron core 11 is attracted to the fixed iron core 9 by exciting the coil, and the movable pin 14 presses and moves the spool 41.
[0019]
The support washer 15 is not limited to the above, and other forms are possible as shown in FIG. A support washer 15A shown in FIG. 4A is composed of a support hole 15a and an annular portion 15b arranged around the support hole 15a, and a plurality of slit-shaped oil passages from the support hole 15a toward the outer periphery. 15e is formed in a radial shape, and oil from the valve body flows into the movable iron core 11 through the oil passage 15e.
[0020]
Also, the washer 15B shown in FIG. 4B has three slit-shaped oil passages 15f along the circumferential direction in the annular portion 15b (other than three if it is plural), and the support hole 15a. It is formed at a position where it does not interfere with. And the oil from a valve body flows in into the movable iron core 11 side through the oil path 15f.
[0021]
When the above-mentioned movable pin support device 13 is mounted on an electromagnet, it is configured as shown in FIG. An electromagnet 1 shown in FIG. 1 is a type in which a tube constituting a tube assembly 5 is formed by a bobbin 6. In more detail, the outer case 3 is formed of a magnetic material and has a front end (lower in FIG. 2). ) Has a flange portion 3a and accommodates the tube assembly 5 and is closed with a rear wall portion 3c having a smaller diameter than the main body portion 3b at the rear end (upward in FIG. 2). Molded by processing.
[0022]
The bobbin 6 is formed of a nonmagnetic material in a cylindrical shape, and has a front end portion opened and a rear end portion 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 stored outward in the outer case 3. The coil 7 is wound and stored. Further, on the rear end side, a disc-shaped flange plate 63 is formed so as to be stored in the outer case 3 with a space from the coil storage wall 62 on the rear side. The lead wire 7a of the coil 7 is accommodated in a gap 6b formed between the flange 63 and the yoke 7 along the outer peripheral surface of the bobbin 6 between the flange plate 63 and the rear end surface of the main body 3b of the outer case 2. 12 is arranged.
[0023]
A stopper 64 that protrudes inward is formed inside the rear wall 6a of the bobbin 6, so that the adhesive area of the movable iron core 11 is reduced so that the movable iron core 11 does not come into close contact with oil when it contacts the rear wall 6a. is doing.
[0024]
Further, a first fitting surface 65 is formed on the inner peripheral surface of the bobbin 6 so as to be fitted to the fixed iron core 9 on the front end side, and is connected to the first fitting surface 65 so as to be connected to the movable iron core 11 on the rear end side. A second fitting surface 66 is formed on which is fitted. The first fitting surface 65 is formed to have a larger diameter than the second fitting surface 66, and the fixed iron core 9 is positioned by the rear end surface of the fixed iron core 9 coming into contact with the front end surface of the second fitting surface 66. .
[0025]
A plurality of slit-like oil grooves are formed in the second fitting surface 66 of the bobbin 6 along the axial direction to form an oil passage. There may be only one oil groove, or a plurality of oil grooves may be formed at equal intervals.
[0026]
The movable iron 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 a convex portion that engages with the concave portion 92 of the fixed iron core 9 on the front end surface. 11a is formed. Then, it is attracted to the fixed iron core 9 by the excitation of the coil 7, and is slid toward the rear wall 6a of the bobbin 6 by the biasing force of the spring by releasing the excitation of the coil 7.
[0027]
The electromagnet 1 is attached so that the flange 3a of the outer case 3 is attached to the valve body 40 and the movable pin 14 is connected to one end of the movable core 14 at the front end surface and the other end at the rear end surface of the spool 41. Deploy. When the coil 7 is excited, a magnetic field is generated in the fixed iron core 9, the movable iron core 11, the yoke 12, and the outer case 3, and the movable iron core 11 moves in a direction to be attracted to the fixed iron core 9. The convex part 11a of the movable iron core 11 is engaged with this. As the movable iron core 11 moves, the movable pin 14 moves in the direction of pressing the spool 41 while being supported by the support washers 15 and 15 in the through hole 93 of the fixed iron core 9. At this time, the oil flowing in from the valve body 40 side is supplied 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 into the bobbin 6. Further, the oil flowing into the second fitting surface 66 of the bobbin 6 lubricates the sliding surface of the movable iron core 11 through the oil groove and flows into the rear of the movable iron core 11. Since the movable pin 14 is supported by the support washer 15 at both ends thereof, the movable pin 14 is moved substantially parallel to the shaft center without undulating, so that the movable iron core 11 is not subjected to an offset load, and the spool 41 is normally operated. . Moreover, the wear of the movable pin 14 itself is also reduced.
[0028]
When the excitation of the coil 7 is released, the magnetic field is demagnetized between the fixed iron core 9 and the movable iron core 11, so that the coil spring 18 (actually, locked between the fixed iron core 9 and the spool 41). In the double solenoid valve, the movable core 11 is moved away from the fixed core 9 via the movable pin by a spring disposed at the same position on the opposite side across the spool 41 of the solenoid valve 1. . The movable iron core 11 is moved back from the position where it is attracted to the fixed iron core 9 to the position where it abuts against the stopper portion 64 of the rear wall 6a of the bobbin 6.
[0029]
As mentioned above, in the said form, although the movable pin support apparatus apparatus 13 in a movable electromagnet is mounted | worn with the electromagnet 1 in which the tube was formed in the bobbin 6, you may mount | wear with another electromagnet. For example, the tube may be formed in a cylindrical pipe disposed in the bobbin 6, or may be a conventional type electromagnet shown in FIG. Further, the oil groove formed in the tube is provided with a plurality of slits in the bobbin 6 in the case of the above-described form, but a plurality of ribs fitted to the movable iron core may be formed in the tube. In addition, instead of forming the oil groove in the tube, the oil groove may be formed in the movable iron core.
[0030]
【The invention's effect】
According to the present invention, the movable pin support device for an electromagnet includes a fixed iron core, a movable iron core disposed so as to approach and separate from the fixed iron core, and one end connected to the tip of the movable iron core. Has a movable pin connected to the spool of the valve body, and is arranged to support the movable pin, wherein the movable pin is formed in a round shape, and the movable pin is A movable pin support member, which is disposed so as to pass through a through hole formed in the fixed iron core in a loosely fitted state and supports the movable pin in at least two places, has a pin support hole and an oil passage. Arranged. And when the movable iron core moves so as to be attracted to the fixed iron core by excitation of the coil, the movable pin moving integrally with the movable iron core is supported by a support washer press-fitted into the fixed iron core, Move in the through hole of the fixed core. Since the movable pin is supported by two support washers at both ends, the movable pin is moved substantially parallel to the shaft center, and the spool is operated normally without applying an offset load to the movable iron core. Pin wear is also reduced. Furthermore, 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.
[0031]
In addition, the movable pin support member is formed in a disc shape, and has an annular portion and a plurality of convex portions formed so as to protrude from the annular portion, and a tip portion of the convex portion is The movable pin is formed so as to support the movable pin, or the movable pin support member has an annular portion and a pin support hole disposed inward of the annular portion, and is formed in a disc shape. In addition, if a plurality of slit-like oil passages are formed in the movable pin support hole, the pin support member can be manufactured at a 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 an embodiment of the present invention. FIG. 2 is a schematic view showing the movable pin support device in FIG. 1. FIG. 4 is a plan view showing another embodiment of the support washer in FIG. 3. FIG. 5 is a front sectional view showing a conventional electromagnet. FIG. 6 is a sectional view showing a movable pin in FIG.
DESCRIPTION OF SYMBOLS 1 ... Electromagnet 3 ... Outer case 3 ... Main-body part 5 ... Tube assembly 6 ... Bobbin (tube)
7 ... Coil 9 ... Fixed iron core 91, 92 ... Recess 93 ... Through hole 11 ... Movable iron core 13 ... Movable pin support device 14 ... Movable pins 15, 15A, 15B ... Support washer 15a ... Support hole 15b ... Ring portion 15c ... Convex Part 15d ... Oil grooves 15e, 15f ... Oil passage 40 ... Valve element 41 ... Spool

Claims (4)

A fixed iron core, a movable iron core disposed so as to be close to and away from the fixed iron core, and a movable pin having one end connected to the tip of the movable iron core and the other end connected to the spool of the valve body. A movable pin support device in an electromagnet for supporting the movable pin,
The movable pin is formed in a round shape, and the movable pin is disposed so as to penetrate in a loosely fitted state through a through hole formed in the fixed iron core,
A movable pin support member that supports the movable pin in at least two places is disposed on the fixed iron core with a pin support hole and an oil passage ,
The movable pin support member is formed in a disc shape, and has an annular portion and a plurality of convex portions formed so as to protrude from the annular portion, and a distal end portion of the convex portion is movable. A movable pin support device in an electromagnet, wherein the movable pin support hole is formed in a movable pin support hole for supporting a pin, and an oil passage is formed between the respective convex portions . A fixed iron core, a movable iron core disposed so as to be close to and away from the fixed iron core, and a movable pin having one end connected to the tip of the movable iron core and the other end connected to the spool of the valve body. A movable pin support device in an electromagnet for supporting the movable pin,
The movable pin is formed in a round shape, and the movable pin is disposed so as to penetrate in a loosely fitted state through a through hole formed in the fixed iron core,
A movable pin support member that supports the movable pin in at least two places is disposed on the fixed iron core with a pin support hole and an oil passage,
The movable pin support member has an annular part and a movable pin support hole arranged inside the annular part and is formed in a disk shape, and a plurality of slit-like shapes are formed in the annular part. The movable pin support device in an electromagnet, wherein an oil passage is formed through the annular portion . The movable pin support device for an electromagnet according to claim 2, wherein the oil passage is formed in a radial shape from the movable pin support hole toward an outer peripheral direction . 3. The movable pin support device for an electromagnet according to claim 2, wherein the oil passage is formed along a circumferential direction at a position not in contact with the movable pin support hole .

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