JPH02209706A - Plunger type solenoid - Google Patents

Abstract

PURPOSE:To restrict a movable core from being rotated around a shaft and position a plate to both the ends of a yoke by which the plate is attracted by a method wherein the cross section of the movable core perpendicular to the moving direction of the movable core is formed into a polygon and a core insertion hole is also formed into the same polygon corresponding to the cross section of the movable core. CONSTITUTION:The cross section of a movable core 17 perpendicular to the moving direction of the movable core 17 is formed into a polygon, for instance a square, and the core insertion hole 16 of a coil bobbin 14 is also formed into the same polygon, for instance a square. As the cross section of the movable core 17 perpendicular to its axial direction is a square and the core insertion hole 16 of the coil bobbin 14 is also a square corresponding to the cross section of the movable core 17, the movable core 17 is restricted from being rotated around the shaft. With this construction, the movable core 17 is not rotated by its own, vibration during the reciprocal movement. Therefore, a plate 18 fixed to the movable core 17 is securely positioned so as to cover both the whole surfaces 10a and 10a of a yoke 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a plunger-type solenoid that is used for controlling machines, etc. by moving a movable iron core back and forth by the magnetic force of the solenoid.

[Prior Art] As the above-mentioned solenoid, the present applicant has developed a solenoid as shown in FIGS. 6 and 7. In this solenoid, a winding bobbin 3 on which a coil 2 is wound is housed inside a yoke having a U-shaped cross section indicated by the symbol l, and an iron core insertion hole 4 formed at the center of the winding bobbin 3 and the yoke 1
．． A movable iron core 6 is inserted into 5. At the upper end of the movable iron core 6, there is a rectangular plate 7 made of a magnetic material such as iron, which is large enough to cover both end surfaces 1a and Is of the yoke 1 and to cover the inside of the yoke 1. Fixed. The movable core 6 is supported by a biasing member such as a coil spring (not shown) so that the plate 7 and both end surfaces 1g and la of the yoke 1 are separated from each other.

The action of the solenoid is that when DC current is applied to the coil 2, the coil 2 generates magnetic force, and the plate 7 fixed to the movable iron core 6 is attracted to both end surfaces 11.1a of the yoke 2. Furthermore, when the coil 2 is de-energized, the movable core 6 returns to its original position due to the action of the biasing member. Various types of control can be performed by utilizing such reciprocating movement of the movable iron core 6.

In such a solenoid, as shown in FIG. 7, since the movable core 6 is cylindrical, it is conceivable that it rotates due to its own vibrations during reciprocating movement. The movable iron core 6 rotates and the plates 7 move as shown by the dashed lines in FIG. 6 on both end faces 1M, 1! of the yoke 1. If the plate 7 is at a shifted position that does not cover the entire surface of the yoke 1, the force with which the plate 7 is attracted to the yoke 1 becomes weaker. Furthermore, when the movable core rotates approximately 90'', the plate 7 completely separates from both end surfaces 1a and In of the yoke 1, as shown by the two-dot chain line in the figure, and the movable core 6 is no longer attracted to the yoke 1. It ends up.

Therefore, in order to prevent the movable core 6 from rotating, as shown in the figure,
A plurality of positioning protrusions 8 are provided at predetermined locations on the upper flange 31 of the winding pobbin 3 facing the plate 7, and the retaining holes 9 formed in the plate 7 are fitted into the protrusions 8.

[Problems to be Solved by the Invention] However, there were problems in that the processing for forming the positioning projections 8 and the engagement holes 9 was time-consuming and the appearance was not good.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and the movable iron core has a polygonal cross section perpendicular to the direction of movement of the movable iron core. The iron core insertion holes are formed in the same polygonal shape.

[Function j Since the movable core has a polygonal cross section in the direction of movement, and the core insertion holes have the same corresponding polygonal shape, the movable core is restricted from rotating around the axis and cannot be adsorbed. The plate is positioned with respect to both end surfaces of the yoke to be rotated.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

Reference numeral 10 in the figure is a yoke made of a magnetic material such as iron. This yoke 10 has a U-shaped cross section, and has an iron core insertion hole 1 in the center.
1 is open. Inside the yoke 10, a winding pobbin 14 consisting of a cylindrical winding drum 12 and seven flanges 13g and 13b integrally formed at the upper and lower ends of the winding drum 12 is accommodated. A coil 15 is wound around the winding drum 12 of the winding pobbin 14. Further, an iron core insertion hole 16 is bored in the axis of the winding drum 12 of the winding pobbin 14. As shown in FIG. 2, this core insertion hole 16 has a square cross section perpendicular to its axial direction.

A movable core 17 is inserted into the core insertion hole 16 so as to be movable in the axial direction. As shown in FIG. 2, the movable core 17 has a square cross section perpendicular to the axial direction that corresponds to the core insertion hole 16 of the winding pobbin 14. Further, a rectangular plate 18 made of a magnetic material such as iron and having a hole 181 is fixed to the upper end of the movable iron core 17 with a pin that tightly fits into the hole 181. In this state, the plate 18 has both end surfaces 1Oa of the yoke 10,
10a, and accordingly, the inside of the yoke 10 can be covered.

The movable core 17 is supported by a biasing member such as a spring (not shown) so that a predetermined distance is left between the plate 18 and both end surfaces 101.10a of the yoke 10.

The action of the solenoid is that when DC current is applied to the coil 15, the coil 15 generates a magnetic force, which resists the force of the biasing member and moves the plate 18 fixed to the movable iron core 17 to both end surfaces 10 of the yoke 10! , 10! Let it be adsorbed to. Furthermore, when the coil 15 is de-energized, the force of the biasing member causes the movable iron core 17 to
is pushed up and returns to its original position as shown in FIG. Various types of control can be performed using such reciprocating movement of the movable core 17.

According to the solenoid having such a structure, the movable core 17 has a square cross section perpendicular to its axial direction, and the core insertion hole 16 of the winding pobbin 14 into which the movable core 17 is inserted also has a square shape. Since it is correspondingly square, the movable core 17
is restricted from rotating around the axis. This j-4
Therefore, the movable core 17 does not rotate due to its own vibration during reciprocating movement. Therefore, the plate 18 fixed to the movable iron core 17 is reliably positioned to cover the entire surface of both end surfaces 101.10a of the yoke 10.

Therefore, the force that attracts the plate 18 to the yoke 10 works reliably and effectively.

Next, with reference to FIG. 3, an example in which the above-mentioned solenoid is used to connect/disconnect a clutch of a motor with a clutch will be described.

In this motor, the rotation of a rotor 21 rotated by a motor body 20 is transmitted to a gear 22, and this is transmitted to an output shaft 25 via a clutch mechanism 23 and a series of reduction gears 24. It has become. The clutch mechanism 23 resists the coil spring 261 provided between the upper and lower clutch gears 23a and 23b, and the upper clutch gear 23! The connection is made by pushing down and bringing the clutch gear 23b into pressure contact with the lower clutch gear 23b. Note that reference numeral 27 is a cam timer that rotates as the output shaft 25 rotates, and 28 is a switch that turns on and off the energization state of the motor main body 20 using the cam timer 27.

In this motor, the solenoid is disposed above the clutch gear 23 on the upper side of the clutch mechanism 23, and the clutch mechanism 23 is connected and disconnected by this solenoid. That is, the solenoid is the clutch gear 23 with the tip of the movable iron core 17 on the upper side! It is attached so that it touches the upper end of the

In this motor with a clutch, the rotation of the rotor 21 is as follows:
It is transmitted to gear 22, but clutch gear 23! , 23b
are separated from each other by the coil spring 26, so the output shaft 25 does not rotate. Here, the solenoid coil 15
When energized, the movable iron core 17 engages the upper clutch gear 23.
1 and engages with the lower clutch gear 23b, so the output shaft 25 rotates.

Note that FIGS. 4 and 5 show other embodiments of the present invention. The movable core 30 in this embodiment has a regular hexagonal cross section perpendicular to its axial direction, and correspondingly, the core insertion hole 3 of the winding bobbin 31
2 is also opened in the shape of a regular hexagon. This solenoid also has the same effects as the solenoid of the above embodiment.

In addition, as is clear from this example, the cross section of the movable core is formed into a triangle, pentagon, or other polygon, and the core insertion hole in one solenoid case is also formed into the same polygonal shape. You may.

[Effects of the Invention] As explained above, according to the plunger type solenoid of the present invention, the movable core has a polygonal cross section perpendicular to the moving direction thereof, and the core of the solenoid case corresponds to the movable core. Since the insertion holes are formed in the same polygonal shape, the movable core is prevented from rotating due to its own vibration during reciprocating movement, and the plates provided on the movable core are attached to the entire surface of both end faces, which are the suction parts. This means that it will be reliably positioned in a position that covers the area. Therefore, there is an advantage that there is no need to form positioning protrusions and holes that fit into each other on the winding bobbin and the plate part as in the conventional case.

[Brief explanation of the drawing]

1 and 2 are diagrams showing one embodiment of the present invention, in which No. xrM is a longitudinal sectional view, and FIG.
3 is a longitudinal sectional view showing an example in which this solenoid is used for connecting and disconnecting a motor clutch, FIG. 4 is a longitudinal sectional view of another embodiment of the solenoid, and FIG. v-v of
6 is a longitudinal sectional view of a conventional solenoid, and FIG. 7 is a plan view thereof. IO... Yoke, 11, 16... Iron core insertion hole, 12... Winding drum, 14... Winding bobbin, 15...・Coil, 17...Movable iron core, 18...Plate. Applicant Higashifuto Seisakusho Co., Ltd. Figure 47 Figure 3 Figure 5Z

Claims (1)

[Claims] A winding bobbin on which a coil is wound is housed in a space of a yoke that has a U-shaped cross section and a core insertion hole formed in the center, and the core insertion hole of the winding bobbin has one end formed in the space of the yoke. In a plunger type solenoid, a movable core is fitted with a rectangular plate capable of covering the yoke so that its other end protrudes from a core insertion hole of the yoke. 1. A plunger type solenoid, wherein a cross section of the movable iron core is formed into a polygonal shape, and an iron core insertion hole of the winding bobbin is formed into the same polygonal shape corresponding to the movable iron core.