JPS5996709A - Solenoid device - Google Patents

Abstract

PURPOSE:To obtain a solenoid device which is relatively simply mounted and does not require so high a dimensional accuracy by supporting a plunger core by an elastic member engaged with a shaft. CONSTITUTION:Ring grooves 41 and 42 are formed on both sides of the plunger through part 43 of the shaft 4, and relatively hard rubber discs 7 and 8 are mounted respectively in these ring grooves 41 and 42. In original form, the hole diameters of the rubber discs 7 and 8 are smaller than those of swell-out parts 44, 43 and 45, and approximately the same as those of the ring grooves 41 and 42 or smaller than those. First, the rubber disc 8 is made to engage with t he ring groove 42 by inserting a shaft 4 into the hole of the rubber disc 8 by slightly strong force, next the shaft 4 is passed through holes of the plunger core 3, a permanent magnet 1 composed of e.g. a rare earth magnetic substance, the plunger core 2, and the rubber disc 7 in this order, and the rubber disc 7 is pushed toward the plunger core 2 by considerably strong force and thus made to engage with a ring groove 7, resulting in the constitution of an assembled body of the shaft 4 with the plunger.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solenoid device that drives a plunger by energizing an electric coil.

There are various types of solenoid devices of this type. The first example is a conventional example.
To explain this as shown in the figure, a shaft 4 passes through a disc-shaped ferrite permanent magnet l whose side surfaces are polarized and magnetized to S and N poles, and a truncated conical magnetic core 2°3 on both sides of the magnet. E-rings 5 and 6 fitted into the ring-shaped groove support the magnetic core 2.3. Rubber discs 7 and 8 for shock prevention are arranged outside the E-ring, and the shaft 4 passes through these rubber discs.

Electric coils 9 and 1.0 are each coil bobbin 11
and 12 windings. The coil bobbins 11 and 12 are supported by a magnetic yoke end plate 13 and a magnetic center plate 15, and a magnetic yoke end plate 14 and a center plate 15, respectively, and are housed in a magnetic cylindrical case (yoke main body) 16. . Both ends of the cylindrical case 16 are bent inward by caulking, and the yoke end plate 13. Coil bobbin 11. Center plate 15. Coil bobbin 12. The yoke end plate 14 and the cylindrical case 16 are integrated.

When a current is applied as shown by arrow A in FIG. 1, the yoke end plates 13 and 14 are magnetized to N poles as shown in the figure.
The center plate 15 is magnetized to the south pole. Since the ferrite permanent magnet 1 has an S pole on its left side and an N pole on its right side, plunger cores 2 and 3 are always magnetized to S and N poles, respectively. Therefore, when a current is applied in the direction of arrow A, plunger core 5 is attracted to yoke end plate 13 and is repelled by center plate I5, trying to move in the direction of arrow B, and plunger core 3 is repelled by yoke end plate 14. It is attracted by the center plays 1 to 15 and tries to move in the direction of arrow B, and these forces are added to the shaft 4, causing the shaft 4 to move in the direction of arrow B and stop when the rubber plate 7 hits the yoke plate 13. do. After the shaft 4 moves to the left (B), when the direction of the current is switched to the direction opposite to the arrow A, this time, the yoke end plates 13° 14
becomes the south pole, the center plate 15 becomes the north pole, the shaft 4 moves to the right (the direction opposite to B), and stops in the state shown in FIG. Used as a driving source for automatically locking and unlocking vehicle doors.

In this type and other types of solenoid devices in which the plunger core is fixed to the shaft, for example, if the plunger core is supported by an E-ring as shown in Figure 1, the plunger core may rattle due to dimensional errors and generate noise. , it may become impossible to attach the E1 Lug.

In particular, the permanent magnet 1 has difficulty achieving dimensional accuracy and has a high probability of producing defective products.

Therefore, without using the E-ring, the plunger core 13,
! Although plunger cores 13 and 14 are fixed to shaft 4 by caulking the outer edge of the shaft through hole 4 inward, compressive force is applied to permanent magnet 1 during caulking, which may cause damage.

Moreover, the caulking work itself is time-consuming.

SUMMARY OF THE INVENTION An object of the present invention is to provide a solenoid device in which a plunger core can be relatively easily attached to a shaft and does not require high dimensional accuracy.

In order to achieve the above object, the present invention provides.

Relatively hard elastic members that substantially correspond to the rubber plates 7 and 8 are engaged with the recessed portions of the shaft, and the plunger core is supported by these elastic members. According to this, even if the dimensional error is a little large,
Attaching the elastic member to the shaft is relatively easy. Also, there is no wobbling after installation. It is also possible to use the elastic member as it is as an impact binding material without increasing the number of parts.

FIG. 2a shows an embodiment of the invention. This embodiment is designed for use as a drive source for automatically locking and unlocking vehicle doors.

In FIG. 2a, the plunger penetration part 43 of the shaft 4
Ring-shaped grooves 41 and 4□ are formed on both sides of the shaft 4, so that the shaft 4 has portions 44+43 and 45 of the same diameter that bulge out more than the ring-shaped grooves 7 and 8. Relatively hard rubber discs 7 and 8 are fitted in the ring-shaped grooves 7 and 8, respectively. In the original form, the hole diameters of the rubber disks 7 and 8 are smaller than the diameters of the bulges 44+43 and 45, and are about the same or slightly smaller than the diameters of the ring-shaped grooves 7 and 8.

First, the shaft 4 is inserted into the hole of the rubber disk 8 with a slightly strong force to engage the rubber disk 8 with the ring-shaped groove 42, and then the shaft 4 is inserted into the plunger core 3. For example, permanent magnets made of rare earth magnetic materials1. Plunger core 2 and rubber disc 7
The rubber disk 7 is passed through the holes in this order in this order, and the rubber disk 7 is pushed toward the plunger core 2 with a fairly strong force to engage the ring-shaped groove 7, thereby forming an assembly of the shaft 4 and the plunger. Its appearance is shown in Figure 3a. Note that in this embodiment, the shaft 4
The length of the plunger penetration portion 43 in the direction along the axis is the length of the plunger core 3. It is made slightly shorter than the total thickness of the permanent magnet 1 and the plunger core 4, and the thickness of the rubber plate 7°8 is approximately the same as the width of the ring-shaped groove 41942.
When the plunger shaft assembly is configured as shown in FIGS. 2a and 3a, the rubber discs 7 and 8 are slightly compressed by the plunger cores 2 and 3, respectively. As a result, the plunger assembly does not wobble with respect to the shaft 4.

Referring again to FIG. 2a, the shaft 4 is connected to the yoke end plate 1.
3 and 14. Yoke end plates 13 and 1
4 are connected by two yoke main bodies 17 and 18. The appearance of the yoke bodies 17 and 18 is shown in FIG. 3b.

The yoke main bodies 17 and 18 have elongated holes 171 and 182, respectively, in the center, and these holes have
As shown in FIG. 2a, the protrusion of the center plate 15 is inserted. The third appearance of the center plate 15
Shown in ap4. The yoke bodies 17 and 18 each have an engaging protrusion 172 with a semicircular opening, as shown in FIG. 3b.
173 and 182° 183 at both ends, these protrusions entering ring-shaped grooves in the cup-shaped yoke end plates 13 and 14 in FIG. 2a. That is, the tip of the engagement protrusion 172 has an 18° tip, and the tip of the engagement protrusion 173 has an 18° tip.
When the yoke main bodies 17 and 18 are placed opposite each other with the tips of the yoke parts 17 and 18 facing each other, the protrusions 172 and 182 and 173 and 183 surround a circular opening, and the ring-shaped yoke end plates 13 and 14 are inserted into the circular opening. groove is located, and the protrusion 17
2 and 182 are engaged with ring-shaped grooves of the yoke end plate 13, and protrusions 173 and 183 are engaged with ring-shaped grooves of the yoke end plate 14. Through this connection, the yoke end plate 13 and the
4 are separated from each other by a predetermined interval.

Referring again to FIG. 2a, on the outside of the yoke end plate 13,
A first electric coil 9 is located between the yoke main protrusions 172 and 182 and the center plate 15, and also between the yoke end plate 1.
A second electric coil 1O is housed on the outside of the yoke main body projections 173 and 183 and the center plate 15. Note that the coil bobbin is omitted.

The external appearance of the electric coils 9 and 10 is shown in FIG. 3b. These coils are made by winding an insulated wire coated with a heat-fusible insulating resin into a coil shape around a bobbin coated with a release agent and heating it.
It is removed from the bobbin mold after it has cooled down, and normally maintains the coil shape shown in FIG. 3b. A cup-shaped yoke end plate 13 is inserted into the coil 9, a cup-shaped yoke end plate 14 is inserted into the coil 10, and the plunger shaft assembly is attached to the center plate 15 as shown in FIG.
The shaft of the plunger shaft assembly is passed through the yoke end plates 13 and 14 to which the coils 9 and 10 are attached, respectively, in the manner shown in FIG. long hole 171
Then, pass another protrusion through the elongated hole 181 of the yoke main body 18 and insert the protrusion 172y 1821 of the yoke main body 17, 18.
17ay183 into the ring-shaped groove of the yoke end plate 13, and the plunger shaft assembly (1 to 4, 7.8) forming the coil-plunger assembly, the yoke end plate 13, 1
4. Center plate 15 and yoke main body 17.18
are integrated.

This coil-plunger assembly is inserted into a synthetic resin outer cylinder 23 together with a leaf spring 19. The appearance of the outer cylinder 23 is shown in Figure 3a.
As shown in the figure. A space 231 for receiving the coil-plunger assembly is formed in the outer cylinder 23, and a hole 232 (FIG. 2a) with a relatively large diameter is bored at the bottom of the space 231 to allow the shaft 4 to pass through. A cylindrical flange 233 is formed extending in the axial direction of the shaft.

The appearance of the leaf spring 19 is shown in FIG. 3b. The leaf spring 19 is
It is an elongated leaf spring that is normally curved, and has two upright pieces 191 and 192 at one end. Leaf spring 1 in normal condition
The width of the yoke 9 in the short axis direction is narrower than the back width of the yoke main body 17.

The inner space 231 of the outer cylinder 23 is shaped to accommodate the coil-plunger assembly and the leaf spring 19 with its curve slightly flattened. When assembling the coil-plunger assembly (1 to 4, 7 to 10) into the outer cylinder 23, the leaf spring 19 is placed on the back of the yoke main body 17 (No. 1 in figure 3b
7) along the protrusions 173.18. and insert into the inner space 231 of the outer cylinder 23 from the upright pieces 191 and 192. During this insertion, the leaf spring 19 becomes slightly flattened,
After the insertion (the state shown in FIG. 2a), the leaf spring 19
is constantly pushing the yoke main body 17 toward 18 with its spring force.

A substantially cylindrical protruding wall 241 that presses the cup-shaped yoke end plate 13 is formed integrally with the lid 24 on the inside of the synthetic resin lid 24 that closes the inner space 231 of the outer cylinder 23 . This protruding wall 241 is divided into two parts, and has a space that accommodates the movable switch plate 20 and the fixed switch plate 22 and allows them to move. A rubber piece 21 is fixed to the switch plate 20 at a position where the tip of the shaft 4 contacts. This switch plate 20 and another switch plate 22 are connected to a lid 24 as shown in FIG. 2a.
is fixed inside. The appearance of the lid 24 is shown in FIG. 3a.

As mentioned above, the coil-plunger assembly (1~4°7~1
0) and the leaf spring 19 into the outer cylinder 23, the electrical leads of the coils 9 and 10 are inserted into the lead holes 244 and 24 of the lid 24.
5, the lid 24 is fixed to the outer cylinder 23 with screws 25 to 27, and the protruding wall 241 of the lid 24 presses the yoke end plate 13. Note that before the lid 24 is fixed to the outer cylinder 23, the switch plates 20 and 22 are fixed thereto, and electrical leads are connected to them, and the electrical leads are connected to the holes 242, 24, . Through the lid 2
4 is pulled out. The electrical leads of the coils 9, 10 and the switch plates 20, 22 are fitted into the lead holder 246 of the lid 24.

The switch plates 20 and 22 are for monitoring to detect the operating state of this solenoid device, and when the plunger shaft assembly is in the left position in Fig. 2a, the rubber plate 21 at the tip of the shaft 4 is Pushed to the left and the switch plate 20 is farther away from 22 (switch off), 2nd a
As shown in the figure, when the shaft 4 is apart from the switch plate 21, the switch plate 21 tries to rotate clockwise due to its elasticity and comes into contact with the switch plate 22 (switch closed).

The cylindrical flange 23□ of the outer cylinder is fitted into one end of the rubber bellows 25. Rubber bellows 2 on the right end of shaft 4
5, the connector 26 is screwed onto the shaft 4 and tightened to fix the rubber bellows 25 to the shaft and also fix the connector 26 to the shaft 4.

FIG. 2a is a longitudinal sectional view of the embodiment described above. The left side view is shown in FIG. 2b, and the right side view is shown in FIG. 2c.

In FIG. 2b, 28 and 29 are electric coils 9, 10
Electrical leads 30 and 31 connected to switch board 2
2. Electrical leads connected to 20. The operation of this solenoid device is similar to the operation of the conventional solenoid device shown in FIG. 1, so a description thereof will be omitted.

As explained above, in the solenoid device of the present invention, the plunger core (2, 3) is supported by the elastic member (7, 8) engaged with the shaft (4). No play occurs even if the dimensional accuracy is rough. Furthermore, the work of connecting the plunger unit to the shaft is easy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of one type of conventional solenoid device. FIG. 2a is a longitudinal sectional view of an embodiment of the present invention, FIG. 2b is a left side view, and FIG. 2C is a right side view. FIGS. 3a, 3b, and 3c are perspective views showing the respective external appearances of the components of the solenoid device shown in FIG. 2a. 1: Permanent magnet 2.3 Nylung gear core (magnetic core) 4: Shaft
5, 6: E-ring 7.8: Elastic member 9.1
0: Electric coil 11.12: Coil bobbin 13.14: Yoke end plate 15: Center plate 16: Cylindrical case 17.18: Yoke main body (yoke) 19: Leaf spring 20.22: Switch plate 21: Rubber piece 23: Outside tube
24: Lid 25-27: Screws 28-31: Electric lead patent applicant Aisin Seiki Co., Ltd.

Claims (3)

[Claims] (1) A permanent magnet that has a hole that the shaft passes through and is magnetized in the direction along the central axis of the hole; Two permanent magnets that have a hole that the shaft passes through and are placed on the north and south pole sides of the permanent magnet. A shaft that passes through the permanent magnet and the hole in the magnetic core and has a recess near the outer surface of the magnetic core; a shaft that partially engages the recess and partially engages the side surface of the magnetic core. an elastic member that comes into contact with and pushes the magnetic core toward the permanent magnet; an electric coil that generates a magnetic flux in a direction along the shaft;
and a yoke forming a magnetic flux flow path along the outside of the electric coil. (2) The solenoid device according to claim 1, wherein the recessed portion of the shaft is a ring-shaped groove extending in one circumferential direction. (3) The solenoid device according to claim (2), wherein the elastic member has a hole with a diameter smaller than the shaft diameter on both sides of the groove, and the hole engages with the groove of the shaft. .