JP2008306122A - Electromagnetic actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a configuration with both of a stopper function for regulating the displacement of a first movable core and a guide function for guiding the displacement of a second movable core. <P>SOLUTION: The electromagnetic actuator 10 has first and second solenoids 24, 26 composing a solenoid section 14. A first guide section 102 of a guide body 36 is inserted inside a first bobbin 40 in the first solenoid 24. A second guide section 104 of the guide body 36 is inserted inside of a second bobbin 68 in the second solenoid 26. The inner-periphery diameter of the second guide section 104 is set smaller than that of the first guide section 102. A first plunger 28 displaced along the first guide section 102 is locked on the end face of the second guide section 104. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electromagnetic actuator capable of displacing a moving element by attracting a movable core to a fixed core by an electromagnetic force generated under the excitation action of a solenoid unit.

  2. Description of the Related Art Conventionally, an electromagnetic actuator is known that displaces a shaft connected to a movable core along an axial direction by attracting the movable core to a fixed core by an electromagnetic force generated under an excitation action of a solenoid unit.

  For example, as shown in FIG. 5, such an electromagnetic actuator has a first fixed magnetic pole 1 provided at one end thereof, and a first plunger 3 is provided on the outer peripheral side of the first fixed magnetic pole 1 via a sleeve 2. A first coil 4 a is provided on the outer peripheral side of the first plunger 3 while being disposed so as to be freely displaceable. A second fixed magnetic pole 5 is provided below the first coil 4 a and the first plunger 3, and a second plunger 6 is movably provided inside the second fixed magnetic pole 5. A third fixed magnetic pole 7 is provided at the other end of the electromagnetic actuator (see, for example, Patent Document 1).

  Then, by exciting the first coil 4a, a magnetic circuit 8 is generated around the first coil 4a, the first plunger 3, the first fixed magnetic pole 1 and the second fixed magnetic pole 5, and the first and second plungers 3 are generated. , 6 are attracted to the third fixed magnetic pole 7 side.

JP 2004-63825 A

  By the way, in the prior art which concerns on patent document 1, the 2nd fixed magnetic pole 5 functioned as a stopper which controls the displacement of the 1st plunger 3, and the 2nd plunger 6 was penetrated in this 2nd plunger 6. It is configured to be guided along the axial direction via the shaft 9. However, since the stopper for the first plunger 3 and the member for guiding the second plunger 6 are configured separately from each other, there is a problem that the number of parts of the electromagnetic actuator increases and the structure becomes complicated.

  The present invention has been made in consideration of the above-described problems, and has a stopper function for restricting the displacement of the first movable core and a guide function for guiding the displacement of the second movable core, thereby simplifying the configuration. An object of the present invention is to provide an electromagnetic actuator that can be realized.

In order to achieve the above-mentioned object, the present invention provides an electromagnetic actuator having a set of solenoid parts and capable of displacing a moving element along an axial direction under the excitation action of the solenoid parts.
A first solenoid having a first bobbin wound with a coil and a first movable core that is displaced under the excitation action of the coil;
A second solenoid disposed coaxially with the first solenoid and having a second bobbin wound with a coil, and a second movable core that is displaced under the exciting action of the coil;
A fixed core disposed coaxially with the first and second solenoids;
A cylindrical first guide portion that is disposed inside the first and second solenoids and through which the first movable core is movably inserted, and is connected to the first guide portion, and the second movable core is A guide body having a cylindrical second guide portion that is inserted in a freely displaceable manner;
With
The fixed core is connected to one end portion of the second guide portion, the first guide portion is connected to the other end portion of the second guide portion, and the inner peripheral diameter of the second guide portion is The first guide portion is set to be smaller than the inner peripheral diameter.

  According to the present invention, the guide body is provided inside the first and second solenoids constituting the solenoid portion, and the first movable core of the first solenoid is inserted into the first guide portion of the guide body so as to be displaceable. In addition, a second movable core of the second solenoid is inserted through the second guide portion of the guide body so as to be displaceable. The inner diameter of the second guide portion is set smaller than the inner diameter of the first guide portion, a fixed core is connected to one end portion of the second guide portion, and the second guide portion is connected to the second guide portion. 1 guide part is connected.

  Therefore, a guide body that guides the displacement operation of the first and second movable cores is provided inside the solenoid part, and the first movable core is inserted through the inner peripheral diameter of the second guide part that constitutes the guide body. Since it is smaller than the inner peripheral diameter of the first guide part, when the first movable core is displaced toward the second movable core side, the displacement is regulated by contacting the end of the second guide part. Is done. Therefore, by configuring the guide body from the first and second guide portions having different inner peripheral diameters, the second guide portion may have both the stopper function of the first movable core and the guide function of the second movable core. It becomes possible. As a result, compared with the conventional electromagnetic actuator that has been provided by a member provided with the stopper function of the first movable core and the guide function of the second movable core, respectively, the configuration can be simplified, Since the number of parts can be reduced, the number of assembling steps can be reduced.

  Also, by setting the outer diameter of the first guide portion to be substantially the same as the outer diameter of the second guide portion, the guide body composed of the first and second guide portions is provided inside the first and second solenoids. The assembling property at the time of assembling can be made good.

  Furthermore, the fixed core is fitted to the inner peripheral surface at one end portion of the second guide portion, and the first guide portion is fitted to the outer peripheral surface at the other end portion of the second guide portion. The first and second guide portions constituting the guide body can be easily arranged and assembled on the same axis, and the guide body and the fixed core can be easily arranged on the same axis. Moreover, the assembly workability | operativity can also be made favorable.

  Furthermore, the first movable core is provided with a first elastic member at an end surface facing the second movable core, and the second movable core is provided with a second elastic member at an end surface facing the fixed core, thereby When the first movable core abuts against the second guide portion, the impact and contact noise are alleviated by the first elastic member, and the second elastic member may cause the second movable core to contact the fixed core. Therefore, the magnetic characteristics of the second solenoid including the second movable core can be improved.

  According to the present invention, the following effects can be obtained.

  That is, by setting the inner peripheral diameter of the second guide portion constituting the guide body to be smaller than the inner peripheral diameter of the first guide portion through which the first movable core is inserted, the first movable core becomes the second movable core. When it is displaced toward the side, it can be brought into contact with the end portion of the second guide portion and locked. Therefore, by configuring the guide body from the first and second guide portions having different inner peripheral diameters, the second guide portion may have both the stopper function of the first movable core and the guide function of the second movable core. As a result, the configuration can be simplified and the number of parts can be reduced as compared with the conventional electromagnetic actuator, so that the number of assembling steps can be reduced.

  Preferred embodiments of the electromagnetic actuator according to the present invention will be described below and described in detail with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates an electromagnetic actuator according to an embodiment of the present invention.

  As shown in FIGS. 1 to 4, the electromagnetic actuator 10 closes a bottomed cylindrical casing 12, a solenoid portion 14 disposed in the casing 12, and an opening end of the casing 12. And an end cover 16.

  A disc-shaped end cover 16 is attached to one end of the casing 12 and closed. An insertion hole 20 is formed in the central portion of the end cover 16 so as to penetrate along the axial direction and pass through a shaft 18 of the solenoid portion 14 described later.

  Further, the other end portion of the casing 12 includes a bottom portion 12a extending substantially in the radial direction substantially orthogonal to the axis of the casing 12, and a through-hole portion 22 is formed substantially at the center of the bottom portion 12a. Yes.

  The solenoid portion 14 is disposed inside the casing 12 and is disposed on the other end portion side of the casing 12 having the first solenoid 24 disposed on the one end portion side of the casing 12 having an open end and the bottom portion 12a. A shaft 18 inserted through a second solenoid 26, a first plunger (first movable core) 28 constituting the first solenoid 24, a fixed core 34 disposed so as to face the second solenoid 26, And a guide body 36 for guiding the first and second plungers (second movable cores) 28 and 30 constituting the first and second solenoids 24 and 26 along the axial direction.

  The first solenoid 24 includes a synthetic resin first bobbin 40 around which the first coil 38 is wound, a synthetic resin first cover 42 surrounding the outside of the first bobbin 40, and the first bobbin 40. The first plunger 28 is provided so as to be displaceable along the axial direction (the directions of arrows A and B), and the first holder 44 is disposed between the first bobbin 40 and the end cover 16. Is done.

  The first bobbin 40 is formed with first and second enlarged diameter portions 46a and 46b that are enlarged in the radially outward direction at both ends thereof. The first and second enlarged diameter portions 46a and 46b are covered with the overhang portions 48a and 48b of the first cover 42, respectively.

  A through hole 52 penetrating along the axial direction is formed in a substantially central portion of the first bobbin 40, and a guide body 36 formed in a cylindrical shape is disposed in the through hole 52.

  An elastic member 54 such as an O-ring is attached to the projecting portion 48a of the first cover 42 through an annular groove on a side surface facing the second holder 56 constituting the second solenoid 26, and the elastic member 54 is connected to the first cover 42a. 2 is brought into contact with the holder 56.

  On the other hand, an elastic member 58 such as an O-ring is mounted on the inner peripheral side of the overhang portion 48 b and is in contact with the outer peripheral surface of the guide body 36.

  The first plunger 28 is formed in a cylindrical shape from a magnetic metal material, and is displaceably provided in the guide body 36 facing the first coil 38. The first plunger 28 is formed with a shaft hole 60 that extends along the axial direction (directions of arrows A and B) and through which a shaft 18 described later is inserted. The shaft hole 60 penetrates in the center of the first plunger 28 along the axial direction, and is formed with substantially the same diameter.

  Also, a first buffer member (first elastic member) 62 made of an elastic material such as rubber is provided on the end surface of the first plunger 28 facing the second plunger 30, and the first plunger 28 is a second plunger. It is displaced toward the 30 side (in the direction of arrow A), and shock is shocked when the first buffer member 62 comes into contact with the end surface of the second guide portion 104 constituting the guide body 36. The first buffer member 62 is not limited to being provided on the first plunger 28 side, and may be provided on the second guide portion 104 side facing the end surface of the first plunger 28.

  The first holder 44 is formed in a ring shape, and is inserted into the other end of the casing 12 coaxially with the casing 12, and the guide body 36 is inserted therein. The first holder 44 sandwiches the flange portion 64 of the guide body 36 between the end cover 16 and the first holder 44.

  The second solenoid 26 includes a synthetic resin second bobbin 68 around which the second coil 66 is wound, a synthetic resin second cover 70 surrounding the outside of the second bobbin 68, and the second bobbin 68. From the second plunger 30 provided so as to be displaceable along the axial direction (directions of arrows A and B), and the second holder 56 disposed between the second bobbin 68 and the first solenoid 24. Composed.

  The 2nd bobbin 68 is formed in the substantially same shape as the 1st bobbin 40, and the 1st and 2nd enlarged diameter part 72a, 72b each diameter-expanded radially outward is formed in the both ends. The first and second enlarged diameter portions 72a and 72b are covered with the overhang portions 74a and 74b of the second cover 70, respectively.

  Further, a through hole 76 penetrating along the axial direction is formed in a substantially central portion of the second bobbin 68, and a guide body 36 formed in a cylindrical shape is disposed in the through hole 76.

  An elastic member 54 such as an O-ring is attached to the overhanging portion 74 a of the second cover 70 through an annular groove on a side surface facing the bottom portion 12 a of the casing 12, and the elastic member 54 comes into contact with the bottom portion 12 a of the casing 12. Is done.

  On the other hand, an elastic member 58 such as an O-ring is mounted on the inner peripheral side of the overhanging portion 74 b and is in contact with the outer peripheral surface of the guide body 36.

  The second plunger 30 is made of a magnetic metal material, and is provided inside the guide body 36 facing the second coil 66 so as to be displaceable. As shown in FIG. 2, the second plunger 30 has a diameter D2 smaller than the diameter D1 of the first plunger 28 (D2 <D1), and the second plunger 30 includes the first plunger 28. A threaded hole 78 is formed at one end of the shaft 18, and the threaded portion 80 of the shaft 18 inserted through the first plunger 28 is screwed together. Thereby, the 2nd plunger 30 and the shaft 18 are connected so that it may become coaxial.

  Further, the other end portion of the second plunger 30 is disposed so as to face the fixed core 34, and a tapered portion 82 having a diameter gradually reduced toward the fixed core 34 side (arrow A direction) is formed. The tapered portion 82 is formed in a tapered shape, and a return spring 84 is interposed between the tapered portion 82 and the fixed core 34.

  The second holder 56 is formed in a ring shape like the first holder 44 and is coaxially inserted into the casing 12, and the position thereof is substantially the center of the casing 12, that is, the overhang of the first cover 42. It is disposed between the portion 48 a and the overhanging portion 74 b of the second cover 70. Further, a guide body 36 is inserted through the inside.

  Here, the second bobbin 68, the second holder 56, the first bobbin 40, and the first holder 44 are elastically sandwiched because the elastic members 54 and 58 are interposed between the bottom 12a of the casing 12 and the guide body 36. Thus, rattling in the axial direction of the second bobbin 68, the second holder 56, the first bobbin 40, and the first holder 44 can be prevented and positioned.

  The shaft 18 is formed of a nonmagnetic material, is inserted through the shaft hole 60 of the first plunger 28, and is connected to the second plunger 30 side (arrow A direction) via a screw portion 80 formed at one end. Connected to the second plunger 30. In addition, on one end portion side of the shaft 18, a flange portion 86 is provided in the vicinity of the screw portion 80, and the diameter of the flange portion 86 is substantially equal to the outer peripheral diameter D <b> 2 of the second plunger 30. In addition, the flange 86 is disposed between the first plunger 28 and the second plunger 30.

  On the other hand, the other end portion of the shaft 18 is inserted into the insertion hole 20 of the end cover 16 and protrudes from the end surface of the end cover 16 to the outside.

  The fixed core 34 is made of a magnetic metal material, is formed on one end side, is formed on the other end side with a large-diameter portion 90 in which a screw portion 88 protrudes at a substantially central portion, and the tapered portion of the second plunger 30. And a small-diameter portion 94 having a concave portion 92 that is recessed in a tapered shape corresponding to 82.

  The large-diameter portion 90 is provided such that an end thereof abuts on the bottom portion 12 a of the casing 12, and a screw portion 88 is inserted through the hole portion 22 of the casing 12. Then, after the washer 96 is inserted into the screw portion 88 from the outside of the casing 12, the cap core 98 is screwed to fix the fixed core 34 to the bottom portion 12 a of the casing 12.

  On the other hand, the second guide portion 104 constituting the guide body 36 is inserted and fixed to the outer peripheral surface of the small diameter portion 94. That is, one end of the guide body 36 is closed by the fixed core 34 that is fixed. Note that the outer diameter of the large-diameter portion 90 in the fixed core 34 and the outer diameter of the guide body 36 are set to be substantially the same diameter.

  The recess 92 is formed so as to gradually increase in diameter toward the second plunger 30 side (in the direction of arrow B), and the return spring 84 interposed between the end of the second plunger 30 The second plunger 30 is biased in a direction (arrow B direction) in which the second plunger 30 is separated from the fixed core 34. A second buffer member (second elastic member) 100 made of an elastic material such as rubber, for example, is provided on the end surface of the second plunger 30 facing the recess 92 and protrudes toward the fixed core 34 side. The second buffer member 100 abuts against the fixed core 34 before the second plunger 30 when the second plunger 30 is displaced toward the fixed core 34 side. Therefore, contact between the second plunger 30 and the fixed core 34 can be prevented.

  The second buffer member 100 is not limited to being provided on the second plunger 30 side, and may be provided in the recess 92 of the fixed core 34 facing the end surface of the second plunger 30. .

  The guide body 36 is disposed inside the first solenoid 24, and the first guide portion 102 into which the first plunger 28 is inserted is attached to the end portion of the first guide portion 102, and the guide body 36 is placed inside the first guide portion 102. It is comprised from the 2nd guide part 104 in which the 2nd plunger 30 is penetrated.

  The first guide portion 102 includes a cylindrical main body portion 106 having a substantially constant diameter, and a flange portion 64 formed at an end portion of the main body portion 106 and having a diameter increased radially outward. Is disposed on one end side of the casing 12 and is sandwiched between the first holder 44 and the end cover 16 constituting the first solenoid 24.

  The main body 106 is inserted into the first bobbin 40 of the first solenoid 24, and the first plunger 28 is movably provided therein. Since the inner peripheral diameter d1 of the main body portion 106 is set substantially equal to the outer peripheral diameter D1 of the first plunger 28, the first plunger 28 is guided along the main body portion 106 in the axial direction. Become.

  The second guide portion 104 is formed in a cylindrical shape and is provided on the first guide portion 102 side (arrow B direction), and the first fitting portion 110 whose outer peripheral surface is depressed and the fixed core 34 side (arrow A direction). And a second fitting portion 112 whose inner peripheral surface is slightly enlarged in diameter. The main body portion 106 of the first guide portion 102 is inserted into and fixed to the first fitting portion 110. Thereby, the 1st guide part 102 and the 2nd guide part 104 which comprise the guide body 36 are assembled | attached coaxially. At this time, the outer peripheral diameter of the second guide portion 104 is formed to have substantially the same diameter as the outer peripheral diameter of the first guide portion 102.

  The second fitting portion 112 is inserted and fitted into the small diameter portion 94 of the fixed core 34. As a result, the guide body 36 and the fixed core 34 are arranged coaxially via the second guide portion 104, and the second guide portion 104 and the fixed core 34 are positioned in the axial direction. The

  The second guide portion 104 is inserted into the second bobbin 68 of the second solenoid 26, and the second plunger 30 is movably provided therein. Since the inner peripheral diameter d2 of the second guide portion 104 is set substantially equal to the outer peripheral diameter D2 of the second plunger 30, the second plunger 30 is guided in the axial direction.

  That is, the inner peripheral diameter d2 of the second guide portion 104 set corresponding to the second plunger 30 is the inner peripheral diameter d1 of the first guide portion 102 corresponding to the first plunger 28 having a larger diameter than the second plunger 30. It is set smaller (d1> d2).

  The electromagnetic actuator 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and action and effects thereof will be described. In the off state where both the first and second coils 38 and 66 constituting the solenoid unit 14 are not energized, the first and second plungers 28 are caused by the elastic force of the return spring 84 as shown in FIG. , 30 is biased in the direction away from the fixed core 34 (the direction of arrow B) (the tip position of the shaft 18 is the first position).

  First, by energizing a power source (not shown) and energizing the first coil 38, the first solenoid 24 constituting the solenoid unit 14 is excited and turned on, and the first magnetic circuit E as shown in FIG. appear. The first magnetic circuit E has a magnetic flux that returns to the casing 12 through the casing 12, the first holder 44, the first plunger 28, and the second holder 56 in order.

  The first plunger 28 is displaced toward the fixed core 34 by the electromagnetic force generated by the first magnetic circuit E, and the flange portion 86 of the shaft 18 is fixed to the fixed core under the displacement action of the first plunger 28. Since it is pressed toward the side 34 (arrow A direction), the second plunger 30 together with the flange 86 is displaced toward the fixed core 34 (arrow A direction) against the elastic force of the return spring 84.

  At this time, the first and second plungers 28 and 30 are guided so as to be displaced in a straight line along the first and second guide portions 102 and 104 of the guide body 36 disposed on the outer peripheral side thereof. .

  The second plunger 30 is pressed toward the fixed core 34 (in the direction of arrow A) via the first plunger 28 by the electromagnetic force generated in the first magnetic circuit E, and the end of the first plunger 28 is the first portion. It is displaced until it abuts against the end portion of the second guide portion 104 via the buffer member 62 (the tip position of the shaft 18 becomes the second position) and stops. In this case, the impact generated under the contact action between the first plunger 28 and the second guide portion 104 is buffered by the first buffer member 62, and the contact sound generated at the time of contact is also reduced.

  Further, as shown in FIG. 4, in addition to the first coil 38 of the first solenoid 24, the second coil 66 of the second solenoid 26 is energized to energize the casing 12, the second holder 56, and the second plunger. A second magnetic circuit F having a magnetic flux returning to the casing 12 through the 30 and the fixed core 34 in sequence is newly generated.

  Thereby, the second plunger 30 is sucked by a suction force generated between the second plunger 30 and the fixed core 34, and is displaced toward the fixed core 34 side (arrow A direction). At this time, since the first plunger 28 is locked by the end face of the second guide portion 104 and the displacement toward the fixed core 34 is restricted, only the second plunger 30 is displaced together with the shaft 18. That is, the shaft 18 is displaced along the shaft hole 60 of the first plunger 28, and the flange portion 86 is separated from the end surface of the first plunger 28, so that a clearance is formed between the flange portion 86 and the end surface. The

  Then, when the second buffer member 100 attached to the end of the second plunger 82 abuts against the recess 92 of the fixed core 34, the second plunger 30 stops (the tip position of the shaft 18 is the same as the third position). Be) Accordingly, the second plunger 82 is prevented from coming into contact with the recess 92, and the magnetic characteristics of the second magnetic circuit F can be improved.

  Next, when the supply of current to the second coil 66 is stopped, the attractive force toward the fixed core 34 (in the direction of arrow A) by the second magnetic circuit F is extinguished, and the second plunger is driven by the elastic force of the return spring 84. 30 is displaced in a direction away from the fixed core 34 (direction of arrow B). Then, the second plunger 30 is stopped when the flange portion 86 of the connected shaft 18 abuts against the end of the first plunger 28 (the tip position of the shaft 18 becomes the second position). At this time, since the first plunger 28 is urged toward the fixed core 34 (in the direction of arrow A) under the excitation action of the first coil 38, the first plunger 28 is separated from the fixed core 34. There is no displacement.

  Further, when the supply of current to the first coil 38 is stopped, the attractive force to the fixed core 34 side of the first plunger 28 by the first magnetic circuit E is also extinguished, and together with the second plunger 30 by the elastic force of the return spring 84. The first plunger 28 is further displaced toward the end cover 16 side (arrow B direction). As a result, the end portion of the first plunger 28 comes into contact with the end cover 16 and stops (the tip position of the shaft 18 becomes the first position) (see FIG. 1).

  In this way, it is possible to obtain three positions of the tip end of the shaft 18. As a result, the operating stroke of the shaft 18 can be set to a long stroke. For example, when the flow rate is controlled at the tip of the shaft 18, the flow rate can be controlled in two stages. It becomes possible to control with high accuracy.

  As described above, in the present embodiment, the guide body 36 that guides the displacement operation of the first and second plungers 28 and 30 is provided in the solenoid portion 14, and the guide body 36 is connected to the first plunger 28. The first guide portion 102 for guiding and the second guide portion 104 for guiding the second plunger 30 are configured. Then, the inner peripheral diameter d2 of the second guide portion 104 is set smaller than the inner peripheral diameter d1 of the first guide portion 102, and the outer peripheral diameter D1 of the first plunger 28 inserted through the first guide portion 102 is By making it larger than the inner peripheral diameter d2 of the second guide part 104, when the first plunger 28 is displaced toward the second plunger 30 side, it is displaced by abutting against the end part of the second guide part 104. Is regulated.

  In other words, since a step is provided between the inner peripheral surface of the first guide portion 102 and the inner peripheral surface of the second guide portion 104, the first plunger inserted through the first guide portion 102. 28 is restricted from being displaced toward the second guide portion 104 (in the direction of arrow A) by the step.

  That is, by forming the guide body 36 from the first and second guide portions 102 and 104 having different inner peripheral diameters, the second guide portion 104 serves as a stopper function for the first plunger 28 and a guide function for the second plunger 30. And can be combined.

  As a result, the structure can be simplified as compared with the conventional electromagnetic actuator which has been provided by a member provided with the stopper function of the first plunger 28 and the guide function of the second plunger 30 separately. Since the number of parts can be reduced, assembly man-hours and manufacturing costs can be reduced.

  Further, the inner peripheral surfaces of the first and second holders 44 and 56 through which the guide body 36 is inserted and the through holes 52 and 76 of the first and second bobbins 40 and 68 are formed with a substantially constant diameter. The workability when assembling the guide body 36 inside the through holes 52 and 76 of the first and second holders 44 and 56 and the first and second bobbins 40 and 68 can be improved. Further, since the first and second holders 44 and 56 are not disposed on the inner peripheral side of the first and second bobbins 40 and 68, the first and second solenoids 24 and 26 are large in the radially outward direction. Is prevented.

  Further, the first plunger 28 is inserted into the first guide portion 102, the second plunger 30 having a small diameter with respect to the first plunger 28, and the second plunger having a small inner peripheral diameter with respect to the first guide portion 102. By inserting it into the guide portion 104, the assembly of the first and second plungers 28, 30 with respect to the guide body 36 can be improved.

  Furthermore, by providing a magnetic body (not shown) inside the second guide portion 104 facing the second holder 56, the magnetic characteristics in the second magnetic circuit F can be improved.

  Note that the electromagnetic actuator according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

It is a whole longitudinal cross-sectional view which shows the structure of the electromagnetic actuator which concerns on embodiment of this invention. FIG. 2 is an enlarged cross-sectional configuration diagram illustrating first and second plungers, a shaft, and a fixed core disposed in a guide body in the electromagnetic actuator of FIG. 1. FIG. 2 is a longitudinal sectional view showing a state in which the first coil is excited and the first and second plungers are displaced toward the fixed core side in the electromagnetic actuator of FIG. 1. FIG. 4 is a longitudinal sectional view showing a state where the second coil is excited in addition to the first coil and the first and second plungers are further displaced toward the fixed core side in the electromagnetic actuator of FIG. 3. It is sectional drawing which shows the structure of the electromagnetic actuator which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electromagnetic actuator 12 ... Casing 14 ... Solenoid part 16 ... End cover 18 ... Shaft 24 ... 1st solenoid 26 ... 2nd solenoid 28 ... 1st plunger 30 ... 2nd plunger 34 ... Fixed core 36 ... Guide body 38 ... 1st Coil 60 ... shaft hole 62 ... first buffer member 66 ... second coil 82 ... tapered portion 84 ... return spring 90 ... large diameter portion 92 ... recessed portion 94 ... small diameter portion 100 ... second buffer member 102 ... first guide portion 104 ... 2nd guide part 106 ... main-body part 110 ... 1st fitting part 112 ... 2nd fitting part

Claims (4)

In an electromagnetic actuator having a set of solenoid parts and capable of displacing the moving element along the axial direction under the excitation action of the solenoid parts,
A first solenoid having a first bobbin wound with a coil and a first movable core that is displaced under the excitation action of the coil;
A second solenoid disposed coaxially with the first solenoid and having a second bobbin wound with a coil, and a second movable core that is displaced under the exciting action of the coil;
A fixed core disposed coaxially with the first and second solenoids;
A cylindrical first guide portion that is disposed inside the first and second solenoids and through which the first movable core is movably inserted, and is connected to the first guide portion, and the second movable core is A guide body having a cylindrical second guide portion that is inserted in a freely displaceable manner;
With
The fixed core is connected to one end portion of the second guide portion, the first guide portion is connected to the other end portion of the second guide portion, and the inner peripheral diameter of the second guide portion is An electromagnetic actuator, wherein the electromagnetic actuator is set smaller than an inner peripheral diameter of the first guide portion. The electromagnetic actuator according to claim 1,
The electromagnetic actuator according to claim 1, wherein an outer peripheral diameter of the first guide portion is set to be substantially the same as an outer peripheral diameter of the second guide portion. The electromagnetic actuator according to claim 1 or 2,
The fixed core is fitted to the inner circumferential surface at one end of the second guide portion, and the first guide portion is fitted to the outer circumferential surface at the other end of the second guide portion. An electromagnetic actuator. The electromagnetic actuator according to any one of claims 1 to 3,
The first movable core is provided with a first elastic member on an end surface facing the second movable core, and the second movable core is provided with a second elastic member on an end surface facing the fixed core. Electromagnetic actuator.

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