JP2022147345A - solenoid - Google Patents

Abstract

To provide a solenoid capable of suppressing the reduction of an amount of a magnetic line moved from a movable element to a stationary part.SOLUTION: A solenoid comprises: a stationary part 2 having a shape which turns around an axis; a coil 3; and a movable element 4. The stationary part 2 is structured by a magnetic material, and is arranged so as to be opposite to the movable element 4. The coil 3 turns around the stationary part at the same axis, and excited by an electric conduction. The movable element 4 is the magnetic material moved along an axial direction to the stationary part 2, and comprises: a hollow cylinder part 41 that is provided to the circumference of the axis; and a plate-like opposite part 42 that is formed in an axial direction end part of the cylinder part 41, and is opposite to an end surface of the stationary part 2, and comprises an extension part 43 that has a tip end 43T separated from the stationary part 2 while being extended to the stationary part side in an outer peripheral edge part of the opposite part 42.SELECTED DRAWING: Figure 6

Description

The present invention relates to a solenoid configured to move in a direction along an axis.

The solenoid includes a stator, a mover, and a coil that are shaped to rotate about an axis, the stator is made of a magnetic material, and has an end face facing the mover, and the mover: A magnetic body that moves along the axial direction with respect to the stator, and is formed at a hollow cylindrical portion provided around the axial center and at an end portion of the cylindrical portion in the axial direction, and a plate-shaped facing portion facing the end surface of the stator, wherein the coil is concentrically wound around the stator, and is energized so as to move the mover toward the stator. The opposing portion of the mover is formed in a disk shape (see Patent Document 1 (unpublished publication) filed by the applicant of the present invention).

In Patent Document 1, magnetic flux lines of a magnetic field generated by energization of a coil move from a stator to a facing portion via a cylindrical portion of the mover, and move from the facing portion to the stator, thereby moving the mover. A force is generated to attract the stator, and the mover moves toward the stator. However, since the facing portion of the mover is disc-shaped, the magnetic flux lines that move to the facing portion do not exist in the direction from the outer peripheral surface of the facing portion, so the magnetic flux lines are dispersed. However, it is difficult to move toward the stator side. As a result, the amount of magnetic flux lines directed from the mover to the end face of the stator is reduced, resulting in a problem that the force for moving the mover to the stator is reduced.

Patent application 2020-142979

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a solenoid capable of suppressing a decrease in the amount of magnetic flux lines moving from a mover to a stator.

A solenoid of the present invention is a solenoid configured to move in a direction along an axis, and includes a stator, a mover, and a coil that are shaped to revolve around the axis, and the stator is made of a magnetic material. and has an end surface facing the movable element in the axial direction. The movable element is a magnetic body that moves along the axial direction with respect to the stator, and is provided around the axial center. a hollow cylindrical portion that abuts against the stator; and a plate-shaped facing portion that is formed at an end portion of the cylindrical portion in the axial direction and faces the end surface of the stator, The coil is concentrically wound around the stator, is configured to move the mover toward the stator when energized, and extends toward the stator at the outer peripheral edge of the facing portion. and an extending portion having a tip spaced apart from the end surface of the stator when the coil is not energized.

According to the present invention, since the outer peripheral edge of the opposing portion is provided with the extending portion extending toward the stator and having the tip spaced apart from the mover, the magnetic flux lines of the magnetic field generated by energizing the coil However, it tends to move from the stator to the opposing portion via the cylindrical portion, and tends to move toward the stator from the tip of the extending portion facing the stator. This can prevent the amount of magnetic flux lines moving from the mover to the stator from decreasing.

Further, in the solenoid of the present invention, the extending portion is provided over the entire circumference of the outer peripheral edge portion of the facing portion, and when the coil is energized to move the mover to the stator, the The extending portion may be configured to overlap the outer peripheral surface of the stator.

According to the above configuration, when the coil is energized to move the mover toward the stator, if the extending portion is configured to overlap the outer peripheral surface of the stator, the axial direction of the solenoid can be reduced. Dimensions can be shortened.

Further, a solenoid of the present invention is a solenoid configured to move in a direction along an axis, and includes a stator, a mover, and a coil that are shaped to revolve around the axis. It has a magnetic path forming part for forming a magnetic path of magnetic flux lines circulating the coil in the cross section of the core, has a housing part for housing a shaft made of a magnetic material, and is inserted into the magnetic path forming part a shaft accommodating portion made of a non-magnetic material, the shaft accommodating portion having a notch or a through hole for exposing the outer surface of the shaft to the magnetic path forming portion; may be provided with a convex portion that protrudes radially inward through a notch or a through hole of the shaft accommodating portion and contacts the shaft.

According to the above configuration, when the coil is energized, the magnetic path forming portion forms a magnetic path of magnetic flux lines circling the coil. The magnetic flux lines move from the convex portion of the magnetic path forming portion to the shaft, and the magnetic flux lines that move to the shaft join the magnetic flux lines that go around the coil, so that the amount of the magnetic flux lines can be suppressed from decreasing. .

According to the present invention, the outer peripheral edge portion of the opposing portion is provided with an extending portion extending toward the stator and having a distal end spaced from the mover, or the magnetic path forming portion provided in the stator is provided in the notch of the shaft accommodating portion. It is possible to provide a solenoid capable of suppressing a reduction in the amount of magnetic flux lines moving from the mover to the stator by providing the convex portion that protrudes radially inward through the portion or the through hole and contacts the shaft.

1 is a front view of a solenoid of the present invention; FIG. It is a side view of the same solenoid. It is the perspective view seen from the back side of the same solenoid. It is an exploded perspective view of the same solenoid. The parts which comprise the same solenoid are shown, (a) is a perspective view of a shaft accommodating part, (b) is a perspective view of a field. FIG. 2 is a cross-sectional view taken along the line VI-VI in FIG. 1 and describes the flow of magnetic flux lines. 7 is a cross-sectional view showing a state in which the movable element of the solenoid is attracted to the stator in FIG. 6; FIG.

An embodiment of the present invention will be described below with reference to the drawings.

The solenoid 1 of the embodiment of the present invention is configured to be non-rotating and movable only along the axis and is shown in FIGS. 1-4. This solenoid 1 includes a stator 2, a coil 3 (see FIG. 6), and a mover 4, which are shaped to revolve around the axis. and a shaft housing portion 12 (see FIG. 5A) having a housing portion 12A for housing a cylindrical shaft 11 made of a magnetic material. This solenoid 1 is applied to, for example, a paper feeding mechanism of a copier. The shaft 11 does not belong to the solenoid 1, but belongs to a part of the paper feeding mechanism or the like to which the solenoid 1 is attached. The bobbin 6, the terminal cover 8, and the shaft accommodating portion 12 are made of synthetic resin, which is a non-magnetic material. The spring 5 is arranged to move the mover 4 away from the stator 2 when not energized. Specifically, as shown in FIG. 6, it is arranged between the lower end of the second inner portion 73 of the field 7 described below and the upper end of the cylinder portion 41 of the mover 4 described later. Here, the stator 2 has a magnetic path forming portion for forming a magnetic path of the magnetic flux lines circulating the coil 3 in the cross section of the axial center. It is configured. The terminal block 8A and the terminal cover 8 can be made of synthetic resin, metal, or the like.

The stator 2 is made of a magnetic metal plate (for example, a plated steel plate). A plate-like end face portion 21, a first outer cylindrical portion 22 extending from the outer peripheral edge of the end face portion 21 toward the side away from the mover 4, and a first cylindrical portion 22 extending from the inner peripheral edge of the end face portion 21 toward the side away from the mover 4. and an inner tubular portion 23 . The end face portion 21 is provided with radially divided stator window portions 9 . In the following description, the mover side in the axial direction of the solenoid 1 is defined as downward, the field side of the solenoid 1 is defined as upward, and the direction perpendicular to the axial direction is defined as the lateral direction.

As shown in FIG. 6, the first outer cylindrical portion 22 is configured in a cylindrical shape extending along the axial direction (upward in the figure) and configured to be shorter in the axial direction than the first inner cylindrical portion 23. ing. Like the first outer tubular portion 22, the first inner tubular portion 23 is configured in a cylindrical shape extending along the axial direction (upward in the figure), and is longer than the first outer tubular portion 22 in the axial direction. is configured to It should be noted that the first inner tubular portion 23 may be configured to have a dimension shorter in the axial direction than the first outer tubular portion 22, and the first inner tubular portion 23 may be shorter than the first outer tubular portion in the axial direction. 22 may be configured to have the same length.

The mover 4 is configured to be movable with respect to the stator 2 along the axial direction. The mover 4 is made of a metal plate made of a magnetic material (for example, a plated steel plate), and as shown in FIGS. A ring-shaped plate-shaped opposing portion 42 integrally formed at the axial end portion (upper end portion in the axial direction) and facing the end face 2T of the stator 2 and having a circular plate-like outer shape, and the opposing portion 42 A cylindrical extending portion 43 integrally formed so as to extend toward the stator 2 (toward the stator 2 side) is provided on the outer peripheral edge of the. A tip 43T of the extending portion 43 is separated from the lower end of the stator 2 with a gap therebetween. This gap is set to a size that allows magnetic flux lines to easily move from the extension 43 to the stator 2 . The opposing portion 42 is provided at a position different in the radial direction and the circumferential direction from the stator window portion 9 of the stator 2, and has the mover window portion 10 divided in the radial direction. In this embodiment, the mover 4 is formed by press-molding a metal plate (for example, a plated steel plate or the like).

The inner diameter of the extending portion 43 is set larger than the outer diameter of the stator 2 , and when the coil 3 is energized to move the mover 4 toward the stator 2 , the extending portion 43 is fixed. It is configured to overlap the outer peripheral surface of the end portion of the first outer cylindrical portion 22 of the child 2 on the side of the movable member 4 (see FIG. 7). In this way, when the coil 3 is energized and the mover 4 is moved to the stator 2 , the extension 43 overlaps the outer peripheral surface of the first outer tubular portion 22 of the stator 2 . If so, the dimension of the solenoid 1 in the axial direction can be shortened. As in this embodiment, the extending portion 43 is preferably configured to extend substantially parallel to the axial direction. Alternatively, depending on the circumstances, the tip (upper end) side of the extending portion 43 may be configured to have a tapered shape located inward.

The coil 3 is wound around a synthetic resin bobbin 6 which is open radially outward so as to rotate concentrically around the stator 2 . When the coil 3 is energized, the coil 3 is energized and attracts the mover 4 to the stator 2 against the biasing force of the spring 5 . The upper side of bobbin 6 around which coil 3 is wound is covered with field (also called casing) 7 .

4 and 6, the bobbin 6 includes a cylindrical portion 61 for winding the coil 3, a ring-shaped lower plate portion 62 extending laterally outward from the lower end of the cylindrical portion 61, and the upper end of the cylindrical portion 61. and a ring-shaped upper plate portion 63 extending laterally outward from the . A plurality (three in FIG. 4) of cylindrical projections 62A protruding downward are formed on the lower end surface of the lower plate portion 62 at intervals in the circumferential direction. These protrusions 62A are engaged with three through holes 21A out of a plurality (six in FIG. 4) of circular through holes 21A formed at intervals in the circumferential direction in the end face portion 21 of the stator 2. ing. In the locked state, the lower end portion of the projection 62A protrudes downward from the lower end surface of the end surface portion 21 of the stator 2, and when the mover 4 is attracted to the stator 2, the mover 4 is attracted. The upper end face 42A (see FIG. 7) of the facing portion 42 of the contacting portion 42A contacts the tip end face of the projection 62A, thereby restricting the adsorption position of the mover 4. As shown in FIG. Three projections 125, which will be described later, are engaged from the opposite direction (below) to each of the remaining three through-holes 21A that are not engaged by the projection 62A. Further, as shown in FIGS. 2, 3 and 7, the upper end surface of the upper plate portion 63 is provided with a prism-shaped projecting portion 13 projecting upward. The protruding portion 13 is inserted into a rectangular through-hole 71A formed in a plate portion 71 of the field 7, which will be described later, and protrudes to the outside. The projecting portion 13 is provided as a member that is fixed to a fixing member side in the copying machine to prevent rotation of the stator 2 side in the copying machine.

The shaft accommodating portion 12 is made of synthetic resin, which is a non-magnetic material, and as shown in FIG. and a cylindrical portion 122 extending upwardly from. The shaft 11 is fitted inside the shaft accommodating portion 12 . Shaft 11 is provided within the copier. A plurality of (three in FIG. 4) legs 123, 123, 123 extending upward are provided on the upper end of the cylindrical portion 122 at intervals in the circumferential direction. A notch for exposing the outer surface of the shaft 11 (or a through hole may be formed in the cylindrical body) between the leg portions 123, 123 adjacent in the circumferential direction of the leg portions 123, 123, 123. 123K is formed. The lower end surface 21B of the end surface portion 21 of the stator 2 is inserted into three through holes 42K formed in the opposing portion 42 of the mover 4 at three locations in the circumferential direction of the outer peripheral edge of the upper end surface of the plate portion 121, respectively. A contact portion 124 for regulating the position of the stator 2 on the lower side in the axial direction is formed. Each contact portion 124 is formed with a columnar protrusion 125 protruding downward. These projections 125 engage the remaining three through holes 21A from below. Further, the upper end of each leg 123 is provided with a claw portion 126 for engaging with the inner peripheral edge of the plate portion 71 of the field 7 from above in the axial direction to regulate the position of the field 7 on the upper side in the axial direction. ing. Therefore, by setting the shaft accommodating portion 12, the three contact portions 124 contact the lower end surface 21B of the end surface portion 21 of the stator 2, and the three claw portions 126 are positioned inside the plate portion 71 of the field 7. Lock to the rim. As a result, all the members constituting the solenoid 1 can be fixed in an integrated state.

In addition, by providing the three contact portions 124, the mover 4 is smoothly and reliably guided along the axial direction while preventing rotation and tilting with respect to the axial direction. More specifically, as shown in FIG. 6, the movement of the mover 4 is achieved by the arc-shaped inner surfaces 124A of the three contact portions 124 (only one is shown in FIG. 6) and the outer peripheral surface 122A of the cylindrical portion 122. The arc-shaped outer peripheral surface of the four surfaces that guide and support the cylindrical portion 41 and form the three through holes 42K of the facing portion 42 of the mover 4 with the arc-shaped outer surfaces 124B of the three contact portions 124. By guiding and supporting 42G, tilting with respect to the axial direction can be reliably prevented.

The field 7 is made of a metal plate made of a magnetic material (for example, a plated steel plate), and as shown in FIGS. A plate-shaped and ring-shaped plate portion 71, an arc-shaped second outer portion 72 for covering the outer peripheral portion of the bobbin 6 excluding a portion of the outer peripheral edge of the plate portion 71 where the terminal block 8A is located, and a cylindrical second inner portion 73 extending from the inner peripheral edge of the plate portion 71 toward the bobbin side. The lower side of the second outer portion 72 is located inside the upper side of the first outer tubular portion 22 of the stator 2 and radially overlaps and contacts. In addition, the lower side of the second inner portion 73 is located outside the upper side of the first inner cylindrical portion 23 of the stator 2 and radially overlaps and contacts therewith.

The plate portion 71 is formed with a rectangular through hole 71A through which the projecting portion 13 can be inserted. As shown in FIG. 4, the second inner portion 73 includes three recesses 73A into which the three legs 123 are inserted, and projections that protrude radially inward from the three notches 123K and contact the outer surface of the shaft 11. 73B and. Therefore, the lines of magnetic flux move from the convex portion 73B of the field 7 to the shaft 11. FIG. That is, as shown in FIG. 6, the coil 3 is energized to generate a magnetic field, and the magnetic flux lines are directed to the first outer cylindrical portion 22 of the stator 2, the second outer portion 72 of the field 7, and the plate portion 71 of the field 7. , through the second inner portion 73 of the field 7 to the first inner tubular portion 23 of the stator 2 and from the convex portion 73B of the second inner portion 73 to the shaft 11 . Both the magnetic flux lines that have moved to the first inner cylindrical portion 23 of the stator 2 and the magnetic flux lines that have moved to the shaft 11 join the cylindrical portion 41 of the mover 4, thereby further suppressing the amount of magnetic flux lines from decreasing. can do. Also, the magnetic flux lines tend to move from the cylindrical portion 41 of the mover 4 to the opposing portion 42 and from the tip of the extending portion 43 of the opposing portion 42 toward the stator side. As a result, it is possible to prevent the amount of magnetic flux lines moving from the facing portion 42 toward the stator side from decreasing, and it is possible to prevent the amount of circulating magnetic flux lines from decreasing. The magnetic flux lines that have moved to the first inner cylindrical portion 23 of the stator 2 also move to the end face portion 21 in addition to the cylindrical portion 41 of the mover 4, and move from the end face portion 21 to the first outer cylindrical portion of the stator 2. Move to 22. At this time, the lines of magnetic flux from the tip 43T of the extending portion 43 also move to the first outer tubular portion 22 of the stator 2 .

As shown in FIG. 4, the mover window portion 10 provided in the mover 4 has a plurality of (four in this embodiment) circular arc-shaped windows formed at one radial position along the circumferential direction at intervals. It is composed of two types of long and short slits 10A and 10B. The two longer slits 10A have the same length in the circumferential direction and the same width in the radial direction. The two shorter slits 10B have the same length in the circumferential direction and the same width in the radial direction. Between the two longer slits 10A and 10A and between the two shorter slits 10B and 10B, rectangular slits as engaging portions that can be engaged with an operation object 14, which will be described later, are provided. A protrusion 10T having a shape (substantially square) is formed. In this embodiment, when the coil 3 is de-energized, the mover 4 is moved away from the stator 2 so that the projecting portion 10T engages with the operation target 14 (see FIG. 1).

As shown in FIG. 4, the stator windows 9 provided in the stator 2 are a plurality of (three in this embodiment) circular arc-shaped windows formed at two positions in the radial direction and spaced along the circumferential direction. It is composed of slits 9A, 9A, 9A, 9B, 9B, 9B. The three radially outer arcuate slits 9A, 9A, 9A all have the same radial width and the same circumferential length. The three radially inner arc-shaped slits 9B, 9B, and 9B all have the same radial width and the same circumferential length, but are wider than the outer slits 9A, 9A, and 9A. is also shorter in the circumferential direction. The radial width of the slits 9A and 9B is set larger than the radial width of the slits 10A and 10B provided in the mover 4 . There are three connecting portions 9C between the outer slits 9A, 9A adjacent in the circumferential direction at intervals of 120 degrees in the circumferential direction, and all three connecting portions 9C have the same length in the circumferential direction. There are three connecting portions 9D between the inner slits 9B, 9B adjacent in the circumferential direction at intervals of 120 degrees in the circumferential direction, and all three connecting portions 9D have the same length in the circumferential direction. The outer connecting portion 9C and the inner connecting portion 9D are located at different positions in the radial direction.

The four slits 10A and 10B of the mover 4 are located between the three radially outer slits 9A of the stator 2 and the three radially inner three slits 9B. Moreover, the radial width of the slits 10A and 10B provided in the mover 4 is made smaller than the radial width of the slits 9A and 9B provided in the stator 2 . Thereby, the distance between the slits 9A and 9B adjacent to each other in the radial direction of the stator 2 can be kept small.

By providing the slits 10A and 10B of the mover 4 between the slits 9A and 9A of the stator 2 as described above, the coil 3 of the solenoid 1 is energized, and the mover 4 moves to the stator 2 and is firmly fixed. be adsorbed. In other words, the magnetic flux lines flowing from the field 7 to the stator 2 move from the outer peripheral portion of the end surface portion 21 of the stator 2 to the inner peripheral portion in the order of the mover 4 → the stator 2 → the mover 4 → the stator 2. After flowing toward it, it flows to Field 7. By repeatedly moving the magnetic flux lines between the mover 4 and the stator 2 in this manner, the amount of attraction can be increased. Therefore, the magnetic efficiency is not lowered by forming the stator window portion 9 and the mover window portion 10 as described above. In addition, unlike an electromagnetic clutch, it does not rotate, so that the position of the mover window 10 with respect to the stator window 9 does not change, so that a predetermined amount of attractive force can be stably generated at all times.

Operation of the solenoid 1 will be described. When the mover 4 is not in operation, it is positioned at a position separated (protruded) from the stator 2 by the urging force of the spring 5 (see FIG. 6), and one protrusion 10T, which is the engaging portion of the stator 2, is operated. The object 14 is engaged and the state in which the operation object 14 is stopped at that position is maintained (see FIG. 1). The operation target 14 is attached to a rotating body (not shown) that is rotatably provided coaxially with the solenoid 1 . When the mover 4 is actuated, the coil 3 is energized so that the mover 4 is attracted to the stator 2 against the biasing force of the spring 5 (retracted position, see FIG. 7). As a result, the engagement with the operation object 14 is released, the operation object 14 rotates, and the energization of the coil 3 is cut off before the operation object 14 passes the other protrusion 10T and makes one rotation. As a result, the movable element 4 is returned to the projecting position (initial position) by the biasing force of the spring 5 . As a result, the rotating operation target 14 engages with the projection 10T, which is the engaging portion of the stator 2, and is stopped at a position after one rotation.

As described above, the present invention is not limited to the above embodiments, and various modifications are possible without departing from the gist of the present invention. For example, a solenoid configured by replacing the planar mover of the solenoid of Japanese Patent Application No. 2020-142979 filed by the applicant of the present invention with the mover 4 having the extending portion 43 of the present invention may be used.

In the above-described embodiment, the shaft accommodating portion 12 has three legs 123, but it may be composed of any number of legs, such as one, two, or four or more.

In the above embodiment, the mover 4 is formed by press forming a metal plate, but the mover 4 may be formed by drawing, roll forming, bending, casting, forging, or the like.

Further, in the above-described embodiment, two engaging portions 10T that can be engaged with the operation target 14 are provided on the mover 4, but may be provided at one location or at three or more locations. Further, the shape of the engaging portion 10T is not limited to a rectangular shape, and may be any shape such as a triangular shape, a polygonal shape with pentagons or more, an oval shape, or the like. Also, the engaging portion 10T may be a recess instead of a projection. Moreover, the engaging portion 10T and the operation target 14 are not limited to approaching and separating, and may always be connected by a link or the like.

Further, in the above-described embodiment, each of the stator 2 and the mover 4 has a shape covering the entire circumference (360 degrees). good too. Moreover, in the embodiment, the one that circulates in a circular shape is shown, but the one that circulates in a polygonal shape may be used.

Further, in the above-described embodiment, the outer shape of the mover 4 is circular, but may be any shape such as elliptical or polygonal. For example, the slits 10A and 10B may have the same shape as the embodiment, and the tubular portion 41 and the facing portion 42 may have different shapes from those of the embodiment.

Further, in the above embodiment, the outer shape of the stator 2 is circular, but may be any shape such as elliptical or polygonal. In this case, the slits 9A and 9B may have the same shape as the embodiment and only the outer shape of the stator 2 may be different.

In the above-described embodiment, the outer shape of the mover 4 is circular, and the outer shape of the stator 2 is also circular. or polygonal shape.

DESCRIPTION OF SYMBOLS 1... Solenoid, 2... Stator, 2T... End face, 3... Coil, 4... Mover, 6... Bobbin, 7... Field, 8... Terminal cover, 8A... Terminal block, 9... Stator window, 9A, 9B Slit 9C, 9D Connecting portion 10 Mover window portion 10A, 10B Slit 10T Protruding portion 10T Engaging portion 11 Shaft 12 Shaft accommodating portion 12A Accommodating portion 12K Opening 13 Protruding portion 14 Operation object 21 End surface 21A Through hole 21B Lower end surface 41 Cylindrical portion 42 Opposite portion 42A Upper end surface 42G Peripheral surface 42K Through hole 43 Extension portion 43T Tip 61 Cylindrical portion 62 Lower plate portion 62A Projection 63 Upper plate portion 71 Plate portion 71A Through hole 72 Second outer side Part 73... Second inner part 73A... Concave part 73B... Convex part 121... Plate part 122... Cylindrical part 122A... Outer peripheral surface 123... Leg part 123K... Notch part 124... Contact part, 124A... inner surface, 124B... outer surface, 125... protrusion, 126... claw portion

Claims (3)

In a solenoid configured to move in a direction along the axis,
A stator, a mover, and a coil having a shape that revolves around the axis,
The stator is made of a magnetic material and has an end surface facing the mover in the axial direction,
The mover is a magnetic body that moves along the axial direction with respect to the stator. and a plate-shaped facing portion formed at the axial end of the stator and facing the end face of the stator,
The coil is concentrically wound around the stator, and is configured to move the mover toward the stator when energized,
A solenoid, wherein the outer peripheral edge of the opposing portion is provided with an extending portion extending toward the stator and having a tip spaced apart from the end surface of the stator when the coil is not energized. The extending portion is provided along the entire circumference of the outer peripheral edge portion of the facing portion, and when the coil is energized to move the mover to the stator, the extending portion extends from the stator. 2. The solenoid according to claim 1, wherein the solenoid is constructed so as to overlap the outer peripheral surface. In a solenoid configured to move in a direction along the axis,
A stator, a mover, and a coil having a shape that revolves around the axis,
The stator includes a magnetic path forming portion for forming a magnetic path of magnetic flux lines that circulate the coil in an axial cross section,
A shaft accommodating portion having a housing portion for housing a shaft made of a magnetic material, and a shaft housing portion made of a non-magnetic material to be inserted into the magnetic path forming portion,
the shaft accommodating portion has a notch or a through hole for exposing the outer surface of the shaft to the magnetic path forming portion;
The solenoid, wherein the magnetic path forming portion includes a convex portion that protrudes radially inward through the notch portion or the through hole of the shaft accommodating portion and contacts the shaft.

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