JP2010098037A - Bidirectional latching solenoid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a bidirectional latching solenoid reduced in cost and small in the frame size thereof. <P>SOLUTION: The bidirectional latching solenoid includes one coil 10, magnetic members 11, 12, and 20 constituting a magnetic path for a magnetic flux induced by the coil 10, and a plunger 13 operated with the magnetic flux induced by the coil 10. The plunger 13 has a magnet 13a, and a direction of power supply to the coil 10 is switched to operate the plunger 13 bidirectionally, and the plunger 13 is held by a magnetic force of the magnet 13a when power supply to the coil 10 is cut. Concretely, the plunger 13 is operated by a repulsive force between one pole of the magnet 13a and the magnetic member 12 and an attractive force between the other pole of the magnet 13a and the magnetic member 12 while power is supplied to the coil 10, and the magnetic member 12 is attracted to and held on the plunger 13 by a magnetic force of one pole of the magnet 13a while power supply to the coil 10 is cut. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bi-directional latching solenoid in which a plunger operates bi-directionally and is self-holding (latching).

  Conventionally, in this type of bidirectional latching solenoid, a magnet (magnet) is arranged on the outer periphery of the center of a cylindrical bobbin, and two coils are wound around the outer periphery of the bobbin on both sides of the magnet (for example, Patent Document 1). .

In this prior art, one of the two coils is energized, and the plunger is operated bidirectionally by switching the energized coil. It is designed to hold (latching).
JP 2002-75729 A

  However, in this prior art, since two coils are used, not only the cost of components is increased, but also there are many electrical connection points with the coil, and the productivity is not good, so that the manufacturing cost is also increased. is there. There is also a problem that the use of two coils causes an increase in the size of the physique.

  In view of the above points, an object of the present invention is to reduce costs and downsize a physique.

In order to achieve the above object, in the invention according to claim 1, one coil (10),
A magnetic member (11, 12, 20) constituting a magnetic path of magnetic flux induced by the coil (10);
A plunger (13) actuated by magnetic flux induced by the coil (10),
The plunger (13) has a magnet (13a);
The plunger (13) is operated bidirectionally by switching the energization direction to the coil (10),
When energization to the coil (10) is interrupted, the plunger (13) is held by the magnetic force of the magnet (13a).

  According to this, since only one coil (10) is used, not only can the cost of parts be reduced compared to the case of using two coils as in the prior art, but also electrical connection with the coil (10). The productivity is improved by reducing the number of parts, and thus the manufacturing cost can be reduced. Therefore, the cost can be reduced and the size of the physique can be reduced.

Specifically, as in the invention according to claim 2, in the bidirectional latching solenoid according to claim 1, when the coil (10) is energized, one of the poles of the magnet (13a) is magnetic. The plunger (13) is actuated by the repulsive force between the body member (12) and the attractive force between the other pole of the magnet (13a) and the magnetic body member (12),
When energization of the coil (10) is interrupted, the plunger (13) may be attracted and held by the magnetic member (12) by the magnetic force of one pole of the magnet (13a).

Specifically, as in the invention according to claim 3, in the bidirectional latching solenoid according to claim 1, when the coil (10) is energized in a predetermined direction, the magnet (13a) The plunger (13) is actuated by the difference between the repulsive force between one pole and the magnetic member (20) and the repulsive force between the other pole of the magnet (13a) and the magnetic member (20). ,
When the coil (10) is energized in the direction opposite to the predetermined direction, the attractive force between one pole of the magnet (13a) and the magnetic member (20) and the other pole of the magnet (13a) The plunger (13) is actuated by the difference between the attractive force between the magnetic member (20) and the magnetic member (20),
When energization of the coil (10) is interrupted, the attractive force between one pole of the magnet (13a) and the magnetic member (20), the other pole of the magnet (13a), and the magnetic member ( The plunger (13) may be attracted and held by the magnetic member (12) due to the difference between the attraction force and 20).

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIG. The bidirectional latching solenoid in the present embodiment is used, for example, as a key lock solenoid that locks an engine key of an automatic vehicle.

  FIG. 1 is a sectional view of a bidirectional latching solenoid in the present embodiment. The bidirectional latching solenoid has one coil 10. The coil 10 is wound around the outer periphery of a cylindrical bobbin (not shown).

  Inside the coil 10 (more specifically, inside the bobbin), a core (magnetic member) 11 formed in a cylindrical shape with a magnetic material is inserted.

  The coil 10 is accommodated in a yoke (magnetic member) 12 formed in a U shape with a magnetic material. One end of the core 11 is in contact with the bottom 12 a of the yoke 12. Thereby, the core 11 and the yoke 12 constitute a magnetic path of the magnetic flux induced by the coil 10.

  A plunger 13 is disposed in the opening of the yoke 12. The plunger 13 has a cylindrical magnet 13a extending in the width direction of the yoke 12 (left and right direction in FIG. 1), and a shaft 13b penetrating through the magnet 13a.

  As for the magnet 13a, the north-pole and the south pole are arrange | positioned in the axial direction (left-right direction of FIG. 1). The shaft 13b is formed of a non-magnetic material, and both end portions of the shaft 13b extend to the outside of the yoke 12 through the through holes 12b provided in portions of the yoke 12 located on both sides in the axial direction of the magnet 13a. The shaft 13 b is slidable with the through hole 12 b of the yoke 12 and supports the plunger 13.

  Stopper surfaces 12c and 12d that restrict the stop position of the plunger 13 are formed at the opening (upper end in FIG. 1) of the yoke 12 so as to oppose the end face on the N pole side and the end face on the S pole side of the magnet 13a. Yes.

  Next, the operation in the above configuration will be described with reference to FIG. For convenience of illustration, the shaft 13b and the through hole 12b of the yoke 12 are omitted in FIG. Further, for convenience of illustration, hatching to be applied to the cross section is omitted in FIG. 2, and reference numerals are omitted in FIGS. 2 (b) to 2 (d). In FIGS. 2B and 2D, symbols shown in the coil 10 indicate the direction of current flowing through the coil 10.

  FIG. 2A shows one state when the coil 10 is not energized. In this state, the plunger 13 is attracted and held on one stopper surface 12c of the yoke 12 by the magnetic force of the south pole of the magnet 13a.

  FIG. 2B shows an operation when the coil 10 is energized in a predetermined direction from the state of FIG. When the coil 10 is energized in a predetermined direction, both the stopper surfaces 12c and 12d of the yoke 12 become S poles due to the magnetic flux generated in the coil 10.

  For this reason, the plunger 13 is moved to the yoke by the repulsive force between the S pole of the magnet 13a and the one stopper surface 12c of the yoke 12 and the attractive force between the N pole of the magnet 13a and the other stopper surface 12d of the yoke 12. 12 is operated toward the other stopper surface 12d.

  As a result, the plunger 13 is attracted to the other stopper surface 12d of the yoke 12. Incidentally, in this state, the core 11 is an N pole.

  FIG. 2 (c) shows a state when the power supply to the coil 10 is cut off after the operation of FIG. 2 (b). In this state, the plunger 13 is attracted and held on the other stopper surface 12d of the yoke 12 by the magnetic force of the N pole of the magnet 13a.

  FIG. 2D shows the operation when the coil 10 is energized in the reverse direction from the state of FIG. Here, “energizing the coil 10 in the reverse direction” means energizing in the direction opposite to the energizing direction in FIG.

  When the coil 10 is energized in the opposite direction, both the stopper surfaces 12c and 12d of the yoke 12 become N poles, so that the attractive force between the S pole of the magnet 13a and one stopper surface 12c of the yoke 12 and the magnet 13a The plunger 13 operates toward one stopper surface 12 c of the yoke 12 by a repulsive force between the N pole and the other stopper surface 12 d of the yoke 12.

  As a result, the plunger 13 is attracted to one stopper surface 12 c of the yoke 12. Incidentally, in this state, the core 11 is an S pole.

  When the current to the coil 10 is cut off after the operation of FIG. 2C, the plunger 13 is moved to the one stopper surface 12c of the yoke 12 by the magnetic force of the south pole of the magnet 13a shown in FIG. It will be in a state where it is adsorbed and held.

  According to the present embodiment, since only one coil 10 is used, it is possible not only to reduce the component cost but also to reduce the number of electrical connection points with the coil as compared to the case where two coils are used as in the conventional technique. As a result, productivity can be improved and manufacturing costs can be reduced, so that costs can be reduced.

  In addition, since only one coil 10 is used, the physique can be reduced in size as compared with the conventional technique using two coils.

(Second Embodiment)
In the first embodiment, the plunger 13 operates in the radial direction of the coil 10 (left-right direction in FIG. 1). However, in the second embodiment, as shown in FIGS. It operates in the axial direction (vertical direction in FIG. 3).

  FIG. 3 is a sectional view of the bidirectional latching solenoid in the present embodiment. The bidirectional latching solenoid in the present embodiment is used for, for example, a key lock solenoid that locks an engine key of an automatic vehicle, as in the first embodiment.

  In the present embodiment, the core 11 of the first embodiment is eliminated, and the plunger 13 is coaxially inserted into the coil 10 (more specifically, inside the bobbin).

  A yoke (magnetic member) 20 constituting a magnetic path of magnetic flux induced by the coil 10 is formed in a U shape with a magnetic material and accommodates the core 11. A through hole 20 b through which one end of the shaft 13 b of the plunger 13 passes is provided in the bottom 20 a of the yoke 20.

  A protrusion 20 c that protrudes in an annular shape toward the inner side in the width direction of the yoke 20 is formed in a portion of the yoke 12 that is closer to the opening than the coil 10 (portion on the upper end side in FIG. 3). A stopper 21 formed in a ring shape with a non-magnetic material is disposed in the opening of the yoke 20 (upper end in FIG. 3).

  The other end of the shaft 13b of the plunger 13 passes through the center hole of the annular stopper 21. The plate surface of the stopper 21 faces the N pole side end surface of the magnet 13a and regulates the stop position of the plunger 13.

  Next, the operation in the above configuration will be described with reference to FIG. For convenience of illustration, hatching to be applied to the cross section is omitted in FIG. 4, and reference numerals are omitted in FIGS. 4 (b) to 4 (d). In FIGS. 4B and 4D, the symbols shown in the coil 10 indicate the direction of current flowing through the coil 10.

  FIG. 4A shows one state when the coil 10 is not energized. In this state, the plunger 13 is attracted and held by the protrusion 20c of the yoke 20 by the magnetic force of the magnet 13a.

  This will be described in detail. When the plunger 13 is in the position of FIG. 4A, the attractive force between the N pole of the magnet 13a and the protruding portion 20c of the yoke 20 is the same as the S pole of the magnet 13a. The dimensions of the magnet 13a and the yoke 12 are set so as to be larger than the attractive force between the protruding portion 20c of the yoke 20 and the magnet 20a.

  Due to the difference between the two suction forces, a force in the direction of the arrow in FIG. 4A (upward in FIG. 4A) acts on the plunger 13. When such a force is acting on the plunger 13, the stopper 21 regulates the N pole side end face of the magnet 13a, so that the plunger 13 is held at the position shown in FIG.

  FIG. 4B shows an operation when the coil 10 is energized in a predetermined direction from the state of FIG. When the coil 10 is energized in a predetermined direction, the magnetic flux generated in the coil 10 causes the bottom 20a of the yoke 20 to become an N pole, and the protruding portion 20c of the yoke 20 becomes an S pole.

  Thereby, an attractive force (hereinafter referred to as an attractive force on the bottom 20a side) is generated between the S pole of the magnet 13a and the bottom 20a of the yoke 20, and the N pole of the magnet 13a and the protruding portion 20c of the yoke 20 are generated. A suction force (hereinafter referred to as a suction force on the protruding portion 20c side) is also generated.

  The dimensions of the magnet 13a and the yoke 12 are set so that the attractive force on the bottom 20a side at this time is larger than the attractive force on the protruding portion 20c side. For this reason, the plunger 13 operates toward the bottom 12 a of the yoke 12 due to the difference between the two suction forces.

  FIG. 4C shows a state when the power supply to the coil 10 is interrupted after the operation of FIG. In this state, the plunger 13 is attracted and held on the bottom 12a of the yoke 12 by the magnetic force of the magnet 13a.

  More specifically, since the attractive force between the S pole of the magnet 13a and the bottom 12a of the yoke 12 is larger than the attractive force between the N pole of the magnet 13a and the protruding portion 20c of the yoke 20, The plunger 13 is attracted and held on the bottom 12a of the yoke 12 due to the difference between the two suction forces.

  FIG. 4D shows the operation when the coil 10 is energized in the reverse direction from the state of FIG. Here, “energizing the coil 10 in the reverse direction” means energizing in the direction opposite to the energizing direction in FIG.

  When the coil 10 is energized in the reverse direction, the bottom 12a of the yoke 12 becomes the south pole, and the protrusion 20c of the yoke 20 becomes the north pole. Thereby, a repulsive force (hereinafter referred to as a repulsive force on the bottom 20a side) is generated between the S pole of the magnet 13a and the bottom 12a of the yoke 12, and the N pole of the magnet 13a and the protruding portion 20c of the yoke 20 are generated. A repulsive force (hereinafter referred to as a repulsive force on the protruding portion 20c side) is also generated.

  At this time, the repulsive force on the bottom portion 12a side is larger than the repulsive force on the projecting portion 20c side. Will work towards.

  When the coil 10 is de-energized after the operation of FIG. 4C, the state shown in FIG. 4A, that is, the plunger 13 is attracted and held by the protruding portion 20c of the yoke 20 by the magnetic force of the magnet 13a. It becomes a state to be.

  Also in the present embodiment, since only one coil 10 is used, the cost can be reduced and the physique can be reduced in size as in the first embodiment.

(Other embodiments)
In addition, each said embodiment is only what showed an example of the specific structure of the bidirectional | two-way latching solenoid by this invention, It is not limited to this, A plunger has a magnet and the electricity supply direction with respect to one coil If the plunger is operated bi-directionally by switching and the energization to the coil is interrupted, the plunger is held by the magnetic force of the magnet, and various modifications are possible.

  For example, in the first embodiment, the core 11 is formed in a columnar shape, but may be formed in a columnar shape other than the columnar shape. Moreover, in the said 1st Embodiment, although the core 11 and the yoke 12 are formed separately, you may form the core 11 and the yoke 12 integrally. Moreover, in the said each embodiment, although the yokes 12 and 20 are formed in U shape, you may form the yokes 12 and 20 in bottomed cylindrical shape.

(A) is sectional drawing of the bidirectional | two-way latching solenoid in 1st Embodiment of this invention, (b) is a perspective view of the said bidirectional | two-way latching solenoid. It is explanatory drawing which shows the action | operation of the bidirectional | two-way latching solenoid of FIG. It is sectional drawing of the bidirectional | two-way latching solenoid in 2nd Embodiment of this invention. It is explanatory drawing which shows the action | operation of the bidirectional | two-way latching solenoid of FIG.

Explanation of symbols

10 coil 11 core (magnetic material member)
12 Yoke (magnetic member)
13 Plunger 13a Magnet

Claims (3)

One coil (10);
Magnetic members (11, 12, 20) constituting magnetic paths of magnetic flux induced by the coil (10);
A plunger (13) actuated by magnetic flux induced by the coil (10),
The plunger (13) has a magnet (13a);
The plunger (13) is operated bidirectionally by switching the energization direction to the coil (10),
The bidirectional latching solenoid is characterized in that when the energization to the coil (10) is cut off, the plunger (13) is held by the magnetic force of the magnet (13a). When the coil (10) is energized, the repulsive force between one pole of the magnet (13a) and the magnetic member (12), and the other pole of the magnet (13a) and the magnetism The plunger (13) is operated by a suction force between the body member (12) and
When energization to the coil (10) is interrupted, the plunger (13) is attracted and held by the magnetic member (12) by the magnetic force of one pole of the magnet (13a). The bidirectional latching solenoid according to claim 1. When the coil (10) is energized in a predetermined direction, the repulsive force between one pole of the magnet (13a) and the magnetic member (20) and the other pole of the magnet (13a). And the plunger (13) is activated by the difference between the repulsive force between the magnetic member (20) and the magnetic member (20),
When the coil (10) is energized in the direction opposite to the predetermined direction, the attractive force between one pole of the magnet (13a) and the magnetic member (20), and the magnet (13a) The plunger (13) is actuated by the difference in attractive force between the other pole of the magnetic member (20),
When energization to the coil (10) is interrupted, the attractive force between one pole of the magnet (13a) and the magnetic member (20), and the other pole of the magnet (13a) The bidirectional mechanism according to claim 1, wherein the plunger (13) is attracted and held by the magnetic member (12) due to a difference with an attraction force between the magnetic member (20) and the magnetic member (20). Latching solenoid.

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