WO2014007230A1

WO2014007230A1 - Electromagnetic actuator

Info

Publication number: WO2014007230A1
Application number: PCT/JP2013/068090
Authority: WO
Inventors: 洋小岩; 俊四戸; 俊樹小笠原; 剛資大野
Original assignee: 株式会社ミクニ
Priority date: 2012-07-05
Filing date: 2013-07-02
Publication date: 2014-01-09
Also published as: BR112014033103A2; CN104471655A; JP2014017282A; IN2014DN10950A

Abstract

Provided is an electromagnetic actuator such that size reduction in accordance with the outer diameter of a coil winding can be achieved while sealing property between a fixed core and a coil part is ensured. On the outside of the outer periphery of a fixed core (12), a cylindrical part (15a) of a moving core (15) is disposed movably along its axis. A coil part (16) is disposed on the outside of the outer periphery of the cylindrical part (15a). The fixed core (12) includes a protruding part (12b) protruding from an end of the cylindrical part (15a). Between the protruding part (12b) and the coil part (16), a ring-shaped seal member (18) is disposed, so that a gap corresponding to the thickness of the cylindrical part (15a) is provided between the protruding part (12b) and the coil part (16). Thus, by disposing the ring-shaped seal member in the gap between the protruding part (12b) and the coil part (16), size reduction in accordance with the outer diameter of the coil winding can be achieved while the sealing property between the fixed core (12) and the coil part (16) is ensured.

Description

Electromagnetic actuator

The present invention relates to an electromagnetic actuator used for driving various members by reciprocating a shaft with a solenoid.

An electromagnetic actuator such as a linear solenoid uses an electromagnetic force acting between a fixed iron core and a movable iron core arranged along a magnetic path formed by a solenoid coil as an attractive force.
The structure of a general linear solenoid has a configuration in which a fixed iron core is provided on the outer periphery of the movable iron core (see, for example, Patent Document 1 and Patent Document 2).

FIG. 4 is a cross-sectional view showing an example of a conventional linear solenoid. This linear solenoid is provided with a movable iron core 3 movably along the axial direction inside two

fixed iron cores

1 and 2 that are opposed to each other with a predetermined gap in the axial direction. It has the structure where the coil part 5 was provided in the outer side.

The coil portion 5 includes a bobbin 5a and a coil 5b wound around the bobbin 5a. An annular seal member (O-ring) 4a, 4b is provided between the bobbin 5a of the coil portion 5 and the fixed

iron cores

1 and 2. Is provided.
A seal member 4a is provided between the flange-shaped portion 1a provided on the first fixed iron core 1 and the flange 5c at the lower end of the bobbin 5a, and the outer peripheral surface of the upper end portion of the second fixed iron core 2 and the upper end of the bobbin 5a. A seal member 4b is provided between the inner peripheral surface of the part. The seal member 4a is a flat seal, and the seal member 4b is a diameter seal.
In FIG. 4, the movable iron core 3 is attracted to the fixed iron core 1 and moved to the fixed iron core 1 side on the left side of the axis О, and the movable iron core 3 is located on the fixed iron core 2 side on the right side of the axis О. Indicates the state.

JP 2009-275841 A JP 2006-153283 A

By the way, in the case of an electromagnetic actuator that does not require a large attractive force and has a small number of coil turns, a space for arranging the seal member (O-ring) 4a on the flat seal side is required, and it is not possible to make it slim in accordance with the coil winding outer diameter. There is.
That is, first, in order to securely seal between the flanged portion 1a of the fixed iron core 1 and the flange 5c of the bobbin 5a with the seal member 4a, a seal member (О with a predetermined size (predetermined diameter and predetermined thickness)). Ring).

On the other hand, when the number of coil turns decreases, the diameter of the bobbin 5a around which the coil is wound can be reduced. That is, as shown by a broken line in FIG. 5, the outer diameter of the flange 5c at the lower end of the bobbin 5a can be reduced.
However, if the outer diameter of the flange 5c is reduced, a part of the seal member 4a having a predetermined size protrudes from the flange 5c, and sufficient sealing performance cannot be ensured. Therefore, the outer diameter of the flange 5c, that is, the outer diameter of the bobbin 5a is reduced. I can't.

Thus, since the outer diameter of the bobbin 5a cannot be reduced even if the number of coil turns is reduced, the diameter cannot be reduced in accordance with the number of turns of the coil, that is, cannot be slimmed in accordance with the outer diameter of the coil winding. There was a thing.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic actuator capable of slimming in accordance with the outer diameter of the coil winding while ensuring a sealing property between the fixed iron core and the coil portion.

In order to achieve the above object, the present invention provides an outer periphery of a fixed iron core, wherein the tubular portion of the movable iron core having a tubular portion is provided so as to be movable along an axial direction thereof. In the electromagnetic actuator provided with a coil part on the outside,
The fixed iron core has a protruding portion protruding from an end portion of the cylindrical portion,
An annular seal member is provided between the protruding portion and the coil portion.

In the present invention, a gap corresponding to at least the thickness of the cylindrical portion is provided in the radial direction between the protruding portion protruding from the end of the cylindrical portion and the coil portion. Therefore, in this gap, an annular seal member is provided between the protruding portion and the coil portion, so that the sealing performance between the fixed iron core and the coil portion can be ensured without increasing the outer diameter of the bobbin. . Therefore, it is possible to achieve slimming in accordance with the outer diameter of the coil winding while ensuring the sealing performance between the fixed iron core and the coil portion.

In the above configuration of the present invention, a hook-like part perpendicular to the axis of the cylindrical part is formed in the protruding part, and the seal member is provided between the hook-like part and the end surface of the coil part. Is preferred.

According to such a configuration, since the seal member is provided between the flange-shaped portion and the end surface of the coil portion, it is possible to reliably perform planar sealing between the fixed iron core and the coil portion by the seal member. it can.

Further, in the configuration of the present invention, the fixed iron core includes another fixed iron core disposed to face the fixed iron core with a predetermined gap in the axial direction thereof,
The movable iron core has the cylindrical portion provided on the outer periphery of the fixed iron core, and a bottom portion that is provided so as to cross the gap and constitutes the bottom of the cylindrical portion,
Another seal member may be provided between the outer peripheral surface of the other fixed iron core and the inner peripheral surface of the coil portion.

According to such a configuration, since the bottom portion of the movable core crosses the gap between the two fixed cores, the magnetic flux passing through the gap passes through the bottom portion without leaking to the electromagnetic force. As a result, the suction force generation efficiency is improved and a large suction force can be obtained. Further, the two fixed iron cores face each other from the opposite sides, so that it is possible to secure a wide delivery surface by eliminating mutual interference, and the suction force generation efficiency is also improved in this respect.
In addition, since another seal member is provided between the outer peripheral surface of the other fixed iron core and the inner peripheral surface of the coil portion, the seal between the other fixed iron core and the coil portion can be sealed with this seal member. It can be done reliably.

According to the present invention, the fixed iron core has a protruding portion that protrudes from the end of the cylindrical portion of the movable iron core, and an annular seal member is provided between the protruding portion and the coil portion. Slimming in accordance with the outer diameter of the coil winding can be performed while ensuring a sealing property between the iron core and the coil portion.

1 is a sectional view showing an actuator according to an embodiment of the present invention. It is the schematic which shows the principal part of an actuator similarly. It is the schematic which shows the principal part of an actuator in case the number of turns of a coil is small similarly. An example of a conventional actuator is shown and is a sectional view thereof. It is an enlarged view of the X circle part in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an electromagnetic actuator according to an embodiment of the present invention. This electromagnetic actuator is used, for example, to operate a fuel lever of a diesel internal combustion engine in a stop direction to automatically stop the engine, or to automatically perform a reverse select lock in a four-wheel manual transmission vehicle. It is.

The electromagnetic actuator includes a first fixed iron core (another fixed iron core in claim 3) 11 and a second fixed iron core (fixed iron core in claim 1) arranged opposite to each other with a predetermined gap G in the direction of the axis O. ) 12.
A movable iron core 15 having a cylindrical portion 15a is provided on the outer periphery of the second fixed iron core 12 so as to be movable along the axial direction. In addition, a coil portion 16 is provided on the outer periphery of the cylindrical portion 15 a and on the outer periphery of the first fixed iron core 11.

In FIG. 1, the movable iron core 15 is attracted to the fixed iron core 11 and moved to the fixed iron core 11 side on the left side of the axis О, and the movable iron core 15 is located on the fixed iron core 12 side on the right side of the axis О. Indicates the state.

The coil unit 16 applies a magnetic field to the two

fixed iron cores

11 and 12 and the movable iron core 15 to form a magnetic path therein, and moves the movable iron core 15 along the axis O. The bobbin 16a and the bobbin And a coil 16b wound around 16a.
Each of these members (the fixed

iron cores

11 and 12, the movable iron core 15, and the coil portion 16) is basically rotationally symmetric, that is, has a circular cross section and is accommodated in a cylindrical housing 30.

The two fixed

iron cores

11 and 12 have

flange portions

21 and 22 on the upper and lower end surfaces, respectively, and guide the magnetic field generated by the coil portion 16 via the

flange portions

21 and 22, and the gap G To form a high-density magnetic flux. When the coil 16b of the coil portion 16 is energized, an attractive force is generated from the two fixed

iron cores

11 and 12 to the movable iron core 15, respectively. However, as will be described later, the first fixed iron core 11 has a larger attractive force. When energized, the movable iron core 15 moves toward the first fixed iron core 11. That is, the first fixed iron core 11 mainly performs a suction action, and the second fixed iron core 12 performs a magnetic flux induction action. A through hole 11a is formed in the first fixed core 11 along the axis O, and a shaft 20 is movably installed in the through hole 11a via two

bearings

17 and 17, and the tip of the shaft 20 is movable. It is fixed to the iron core 15. The outer diameter of the second fixed iron core 12 is smaller than that of the first fixed iron core 11, so that a space for arranging the cylindrical portion 15 a of the movable iron core 15 is provided between the inner surface of the coil portion 16. Is formed.

The movable iron core 15 is formed in a cup shape (bottomed cylindrical shape) from a cylindrical portion 15a extending along the axis O direction and a bottom portion 15b extending in a direction intersecting the axis O so as to cross the gap G. The cylindrical portion 15a constitutes a magnetic flux guiding portion, and the bottom portion 15b constitutes a magnetic flux acting portion.

The tip of the shaft 20 is inserted and fixed in a through hole formed in the center of the bottom portion 15b. The inner surface of the cylindrical portion (magnetic flux guiding portion) 15a faces the outer surface of the second fixed iron core 12 with a small gap, and most of the magnetic flux between the second fixed iron core 12 and the movable iron core 15 is these surfaces. It passes here along a direction substantially perpendicular to the axis, that is, a direction perpendicular to the axis O. Therefore, almost no force in the direction of the axis O is generated between the second fixed iron core 12 and the movable iron core 15. On the other hand, the first fixed iron core 11 faces only the bottom (magnetic flux acting part) 15b of the movable iron core 5, and the magnetic flux generated here has a component in the axis O direction, so that an attractive force in the axis O direction is generated. . Accordingly, a suction force toward the first fixed iron core 11 acts on the movable iron core 15.

In the present embodiment, the end surface on the gap G side of the first fixed iron core 11 is formed with a recess 32 having a tapered surface 31 whose side surface is widened toward the opening, and is opposed to this of the movable iron core 15. The bottom portion (magnetic flux acting portion) 15b, which is a portion to be formed, is formed in a shape corresponding to the concave portion 32. That is, the magnetic flux acting portion 15b in this example includes a first acting portion 34 having a tapered surface corresponding to the tapered surface 31 of the recessed portion 32 and a second acting portion 35 having a plane corresponding to the bottom surface of the recessed portion 32. Have. With such a configuration, the change in the suction force in the direction of the axis O relative to the displacement of the movable iron core 15 can be reduced, the change in the suction force in the stroke range can be suppressed, and a linear suction force characteristic can be obtained.

The second fixed iron core 12 is formed by integrally forming the flange-like portion 22 at the upper end of a cylindrical fixed iron core main body 12 a, and the upper end 12 b of the fixed iron core main body 12 a is formed of the movable iron core 15. The protrusion part 12b which protrudes from the upper end part of the cylindrical part 15a is comprised. And the said hook-shaped part 22 is formed in the upper end of this protrusion part 12b coaxially with the fixed iron core main body 12a.

An annular seal member 18 formed of an O-ring is provided between the protruding portion 12 b of the fixed iron core 12 and the bobbin 16 a of the coil portion 16.
That is, a recess for fitting the seal member 18 is formed on the upper end surface of the bobbin 16a, and the seal member 18 is fitted in the recess. The upper half of the sealing member 18 protrudes upward from the recess, and the protruding sealing member 18 is in close contact with the flange-shaped portion 22. In this way, the seal member 18 is provided between the bowl-shaped portion 22 and the end surface of the bobbin 16a of the coil portion 16. The seal member 18 constitutes a flat seal.

Further, another seal member 19 is provided between the fixed iron core 11 and the coil portion 16. That is, a recess for fitting the seal member 19 is formed on the inner peripheral surface of the lower end portion of the bobbin 16a of the coil portion 16, and the seal member 19 is fitted in this recess. The inner half of the seal member 19 protrudes inward from the recess, and the protruded seal member 19 is in close contact with the outer peripheral surface of the fixed iron core 11 and the flange portion 21. In this way, another seal member 19 is provided between the outer peripheral surface of the fixed iron core 11 and the inner peripheral surface of the coil portion 16. The other seal member 19 constitutes a diameter seal.

According to the present embodiment, as shown in FIGS. 2 and 3, the protrusion 12 b of the fixed iron core 12 that protrudes from the end of the cylindrical portion 15 a of the movable iron core 15 and the bobbin 16 a of the coil portion 16 are provided. A gap S corresponding to at least the thickness of the cylindrical portion 15a is provided in the radial direction.
Accordingly, in the gap S, the annular seal member 18 is provided between the protruding portion 12b and the bobbin 16a of the coil portion 16, so that the fixed iron core 12 and the coil portion can be formed without increasing the outer diameter of the bobbin 16a. 16 can be secured. Therefore, it is possible to achieve slimming in accordance with the outer diameter of the coil winding while ensuring the sealing performance between the fixed iron core 12 and the coil portion 16. That is, when the number of coil turns of the coil portion 16 shown in FIG. 2 decreases as shown in FIG. 3 (when the radial thickness of the coil 16b decreases), the diameter of the bobbin 16a is adjusted accordingly. Since it can be made smaller, it can be slimmed to match the outer diameter of the coil winding while ensuring sealing performance.
Further, since the seal member 18 can be disposed inside the inner diameter of the coil portion 16, the diameter size of the seal member 18 can be reduced, and the cost can be reduced accordingly.

Further, since the seal member 18 is provided between the flange-shaped portion 22 of the fixed iron core 12 and the end surface of the bobbin 16 a of the coil portion 16, a plane between the fixed iron core 12 and the coil portion 16 is provided by the seal member 18. Sealing can be performed reliably.
Further, since the seal member 19 is provided between the outer peripheral surface of the fixed iron core 11 and the bobbin 16a of the coil portion 16, the seal member 19 ensures a radial seal between the fixed iron core 11 and the coil portion 16. It can be carried out.

Further, since the bottom portion (magnetic flux acting portion) 15b of the movable iron core 15 crosses the gap G between the two fixed

iron cores

11 and 12, the bottom portion does not leak the magnetic flux passing through the gap G to the other. (Magnetic flux action part) 15 will be passed and an electromagnetic force will be generated, the attraction | suction force generation efficiency will improve and a big attraction | suction force can be obtained. Further, the two fixed

iron cores

11 and 12 face the bottom portion (magnetic flux acting portion) 15b from the opposite sides, so that it is possible to secure a wide delivery surface by eliminating mutual interference. Will improve.

In the present embodiment, of the two fixed

iron cores

11 and 12, the cylindrical portion of the movable core having a cylindrical portion is provided on the outer periphery of the fixed iron core 12 so as to be movable along the axial direction. However, the present invention is not limited to this, but can be applied to an electromagnetic actuator in which a cylindrical movable iron core is provided on the outer periphery of one fixed iron core so as to be movable in the axial direction.

11 First fixed iron core (other fixed iron cores)
12 Second fixed iron core (fixed iron core)
15 Movable iron core 15a Tubular part 15b Bottom part 16 Coil part 16a Bobbin 16b Coil 18 Seal member (flat seal)
19 Other seal members (diameter seals)
22 bowl

Claims

In the electromagnetic actuator in which the cylindrical part of the movable iron core having a cylindrical part is provided on the outer peripheral outer side of the fixed iron core so as to be movable along the axial direction, and the coil part is provided on the outer peripheral outer side of the cylindrical part.
The fixed iron core has a protruding portion protruding from an end portion of the cylindrical portion,
An electromagnetic actuator, wherein an annular seal member is provided between the protruding portion and the coil portion.
The protrusion is formed with a hook-shaped portion orthogonal to the axis of the cylindrical portion,
The electromagnetic actuator according to claim 1, wherein the seal member is provided between the flange-shaped portion and an end surface of the coil portion.
With respect to the fixed iron core, provided with another fixed iron core disposed to face the fixed iron core via a predetermined gap in the axial direction,
The movable iron core has the cylindrical portion provided on the outer periphery of the fixed iron core, and a bottom portion that is provided so as to cross the gap and constitutes the bottom of the cylindrical portion,
The electromagnetic actuator according to claim 1, wherein another seal member is provided between an outer peripheral surface of the other fixed iron core and an inner peripheral surface of the coil portion.