JP2015060952A - Linear solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the possibility that a coil 2 is damaged by oil and water etc. intruding from the exterior in a linear solenoid 1 where first and second stators 4, 5 are respectively disposed at inner and outer peripheries of a cylindrical movable element 3.SOLUTION: According to a linear solenoid 1, in a bobbin 30, resin protrusions 42a, 42b are respectively provided on a surface of a flange 41a at the one axial end side and a surface of a flange 41b at the other axial end side. The resin protrusions 42a, 42b are melted by a molten resin and then solidified to provide one end side seal γ and the other end side seal δ. The seals block oil and water etc. from reaching a coil 2 through a boundary surface formed between the solidified resin and the bobbin 30. Thus, the structure reduces the possibility that the coil 2 is damaged by the oil and the water etc. intruding from the exterior.

Description

  The present invention relates to a linear solenoid that outputs thrust acting in the axial direction.

2. Description of the Related Art Conventionally, linear solenoids that output thrust using magnetic flux generated by energization of a coil are well known, and are used by being mounted on a vehicle, for example.
By the way, in the linear solenoid, the movable element has a cylindrical shape as a structure that can increase the amount of movement (hereinafter sometimes referred to as a stroke) of the movable element without expanding the physique in the axial direction. It is publicly known that a stator is disposed on each of the inner and outer peripheries of a cylindrical portion (see, for example, Patent Document 1).

That is, Patent Document 1 discloses a linear solenoid having a mover made of a magnetic material and first to third stators described below as a more preferable configuration.
First, the mover has a cylindrical magnetic part, and is incorporated so as to be movable in the axial direction coaxially with the coil on the inner periphery of the coil. The first stator is disposed on the inner peripheral side of the cylindrical magnetic portion of the mover and transfers magnetic flux to the mover in the radial direction. The second stator is a cylindrical magnetic part, and is arranged on the outer peripheral side of the mover, sandwiches the mover in the radial direction together with the first stator, and transfers magnetic flux to the mover in the radial direction. Further, the third stator is disposed away from the second stator in the axial direction, and magnetically attracts the mover in the axial direction.

  By the way, the linear solenoid is often used in an environment where there is a high possibility that oil, water, or the like may enter the inside, and it is necessary to prevent the coil from being damaged by the infiltrated oil, water, or the like. In this regard, according to Patent Document 1, a structure in which resin is filled on the outer peripheral side of the coil is disclosed. However, an interface is formed between the bobbin around which the coil is wound and the filled resin, and oil or water may reach the coil from the inner peripheral side of the coil through this interface, and the coil may be damaged. is there.

JP 2005-045217 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a linear solenoid in which a cylindrical portion is provided on a mover and a stator is disposed on each of the inner and outer circumferences of the cylindrical portion. The object is to reduce the possibility of the coil being damaged by oil or water entering from the outside.

According to the first invention of the present application, the linear solenoid outputs the thrust acting in the axial direction by using the magnetic flux generated by energizing the coil. The mover and the first stator described below , A second stator, a third stator, a bobbin, one end side seal and the other end side seal.
First, the mover has a cylindrical magnetic part, and is incorporated so as to be movable in the axial direction coaxially with the coil on the inner periphery of the coil. Further, the first stator is made of a magnetic material, and is disposed on the inner peripheral side of the cylindrical magnetic portion of the mover and transfers magnetic flux to the mover in the radial direction.

  The second stator is a cylindrical magnetic part, and is arranged on the outer peripheral side of the mover, sandwiches the mover in the radial direction together with the first stator, and transfers magnetic flux to the mover in the radial direction. In addition, the third stator is made of a magnetic material, and is spaced apart from the second stator in the axial direction, and magnetically attracts the mover in the axial direction. Further, the bobbin is disposed on the outer peripheral side of the second stator, and is a resin-made cylinder portion around which the coil is wound, and a resin that is provided at both ends in the axial direction of the cylinder portion and divides a region around which the coil is wound with respect to the axial direction. Two flanges made of

  The one end side seal is solidified after melting an annular resin ridge provided on the surface on one end side in the axial direction of the flange on one end side in the axial direction and surrounding the axis of the coil with a molten resin. Is provided. Furthermore, the other end side seal was melted by the molten resin on the annular resin ridge provided on the surface on the other end side in the axial direction of the flange on the other end side in the axial direction and surrounding the axis of the coil. After that, it is provided by solidifying.

  Thereby, oil, water, etc. can be prevented from reaching the coil through the interface formed between the solidified resin and the bobbin. For this reason, it is possible to reduce the possibility of the coil being damaged by oil or water that has entered from the outside.

  According to a second invention subordinate to the first invention of the present application, the linear solenoid includes a first delivery structure described below. That is, the first delivery structure is a structure in which another magnetic part integrally provided on the second stator and another magnetic part integrally provided on the third stator are brought into contact with each other to transfer the magnetic flux. is there. According to the first delivery structure, another magnetic portion on the second stator side is extended to the outer peripheral side on the other axial end side of the coil, and third on the outer peripheral side than the flange on the other axial end side. The magnetic flux is transferred by contacting another magnetic part on the stator side.

Furthermore, another magnetic part on the second stator side is provided in a shape that does not sterically interfere with the resin ridge that forms the other end side seal.
Thereby, even when providing the 1st delivery structure, the filling area | region of the molten resin can be ensured around the resin bulge on the other end side in the axial direction, and the other end side seal can be provided.

According to the linear solenoid of the third invention subordinate to the first and second inventions of the present application, the first delivery structure is provided on one end side in the axial direction from the terminal of the coil.
Thereby, the process of providing the notch etc. which pulls out the terminal of a coil can be simplified. That is, since another magnetic part on the second stator side is extended to the outer peripheral side, a notch or the like is provided so as to penetrate the extended part of the magnetic part in the axial direction, and the coil terminal is It can be pulled out.

  Here, the operation of penetrating the tool or the like in the axial direction is easier than the operation of penetrating the tool or the like in the radial direction. If the first delivery structure is provided on the other end side in the axial direction from the coil terminal, it is necessary to provide a notch or the like so as to penetrate the magnetic part in the radial direction. Therefore, by providing the first delivery structure on one end side in the axial direction from the terminal of the coil and providing a notch or the like so as to penetrate the magnetic part in the axial direction, the process of providing the notch or the like can be facilitated. .

It is sectional drawing of a linear solenoid. (A) is sectional drawing of the movable part of a linear solenoid, (b) is a front view of the movable part of a linear solenoid. It is sectional drawing of the fixed part of the linear solenoid before molding. It is explanatory drawing which shows the axial direction length in connection with delivery of the magnetic flux between a 1st stator and a needle | mover. (A) is sectional drawing of a 1st magnetic body, (b) is a front view of a 1st magnetic body. It is a front view of a bobbin and a terminal. It is a front view of a 3rd magnetic body. It is explanatory drawing which shows the liquid level of the fluid in a linear solenoid.

  The linear solenoid of embodiment is demonstrated using an Example.

[Configuration of Example]
The structure of the linear solenoid 1 of an Example is demonstrated using drawing.
The linear solenoid 1 generates magnetic attraction force using magnetic flux generated by energization of the coil 2 and outputs it as thrust. For example, the linear solenoid 1 is mounted on a vehicle and changes the valve timing of the internal combustion engine. Used to switch the hydraulic pressure supply destination in the timing mechanism.
And the linear solenoid 1 is provided with the needle | mover 3 demonstrated below as a structure in connection with magnetic attraction force, and the 1st, 2nd, 3rd stator 4,5,6.

  The mover 3 is a cylindrical magnetic body, and is incorporated in the inner periphery of the coil 2 so as to be movable in the axial direction coaxially with the coil 2. The mover 3 is provided with a breathing path 8 through which fluid flows in and out between one end side and the other end side in the axial direction of the mover 3. Two respiratory paths 8 are provided, for example, at an angular interval of 180 ° on the inner peripheral surface of the mover 3 (see FIG. 2), both of which penetrate the mover 3 in the axial direction and the inner peripheral surface. It is provided as a groove opened to the surface.

  The first stator 4 is a part of the first magnetic body 9 that is one of the members on the fixed side, and is provided in a columnar shape. The first stator 4 is arranged on the inner peripheral side of the mover 3 to support the mover 3 so as to be slidable in the axial direction from the inner peripheral side, and transfers magnetic flux to the mover 3 in the radial direction. .

  The second stator 5 is a part of the second magnetic body 10 which is a separate member from the first magnetic body 9 and is provided in a cylindrical shape. And the 2nd stator 5 is arrange | positioned at the outer peripheral side of the needle | mover 3, pinches | interposes the needle | mover 3 with the 1st stator 4 to radial direction, and delivers a magnetic flux to the needle | mover 3 to radial direction. Note that a predetermined gap is formed in the radial direction between the inner peripheral surface of the second stator 5 and the outer peripheral surface of the mover 3, and the mover 3 is not in sliding contact with the second stator 5. Move in the direction.

  The third stator 6 is a part of the third magnetic body 11, which is a separate member from the first and second magnetic bodies 9 and 10, is provided in a cylindrical shape, and is coaxial with the second stator 5. And it arrange | positions away from the 2nd stator 5 at the axial direction one end side. And the 3rd stator 6 attracts | sucks the needle | mover 3 to an axial direction one end side based on the generate | occur | produced magnetic flux, and draws in to its inner periphery.

  Further, the inner peripheral opening of one end side in the axial direction of the third stator 6 (the side opposite to the side where the second stator 5 exists) is separate from the first to third magnetic bodies 9 to 11. It is sealed by a cover 12 that is a magnetic material. The cover 12 prevents foreign matter from entering from the outside to the inside of the linear solenoid 1, and mainly prevents the foreign matter from entering by a lid portion 13 that swells in an umbrella shape at one end in the axial direction. Further, the cover 12 is provided with a cylindrical portion 14 that is press-fitted into the inner periphery of the third stator 6, and the cylindrical portion 14 increases an area related to the transfer of magnetic flux.

  Here, in the linear solenoid 1, the magnitude relationship that the inner peripheral diameter a of the third stator 6 is larger than the inner peripheral diameter b of the second stator 5 is established (see FIG. 3). The inner peripheral diameters a and b are larger than the outer peripheral diameter c of the first stator 4. For this reason, with the first to third stators 4 to 6 arranged on the inner periphery of the coil 2, the positioning jig 15 is inserted from the inner periphery opening on one end side in the axial direction of the third stator 6. The first to third stators 4 to 6 can be directly positioned with respect to the radial direction.

Moreover, the linear solenoid 1 is provided with the 1st, 2nd delivery structure (alpha) and (beta) demonstrated below regarding delivery of the magnetic flux between the 1st-3rd magnetic bodies 9-11.
First, the first delivery structure α is a magnetic part different from the second stator 5 in the second magnetic body 10 and a magnetic part different from the third stator 6 in the third magnetic body 11. And the magnetic flux is transferred by contacting the magnetic flux.

  Here, the second magnetic body 10 has an annular plate-like other-end side yoke 16 that extends from the other axial end of the second stator 5 to the outer peripheral side and covers the other axial end of the coil 2. Further, the third magnetic body 11 extends from one end in the axial direction of the third stator 6 to the outer peripheral side and covers the one end side yoke 17 in the shape of an annular plate that covers the one end side in the axial direction of the coil 2. A cylindrical outer yoke 18 extending from the other end in the axial direction to cover the outer peripheral side of the coil 2. Further, the third magnetic body 11 has an annular plate-shaped flange portion 19 that extends from the other axial end of the outer yoke 18 to the outer periphery.

And according to the 1st delivery structure (alpha), magnetic flux is delivered by the outer peripheral part 20 and the collar part 19 of the other end side yoke 16 surface-contacting.
That is, the other end side yoke 16 extends to the outer peripheral side from the outer peripheral edge of the coil 2, and the outer peripheral portion 20 exists on the outer peripheral side from the outer peripheral edge of the coil 2. Further, the surface 20a on one end side in the axial direction of the outer peripheral portion 20 is a plane perpendicular to the axial direction, and the surface 19b on the other end side in the axial direction of the flange portion 19 is also a plane perpendicular to the axial direction.

Then, by bringing the surfaces 20 a and 19 b into surface contact, the magnetic flux is transferred between the second magnetic body 10 and the third magnetic body 11 on the outer peripheral side of the coil 2.
In addition, since the flange part 19 and the outer peripheral part 20 do not form an uneven fitting or the like, the flange part 19 and the outer peripheral part 20 can be relatively moved in the radial direction at the time of positioning by the jig 15.

Next, the second delivery structure β includes a magnetic part different from the first stator 4 in the first magnetic body 9 and a magnetic part different from the second stator 5 in the second magnetic body 10. It is the structure which contacts a part and delivers magnetic flux.
Here, the first magnetic body 9 has a ring-shaped plate-like flange portion 21 that spreads from one end in the axial direction of the first stator 4 to the outer peripheral side.

And according to the 2nd delivery structure (beta), magnetic flux is delivered because the inner peripheral part 23 of the other end side yoke 16 and the outer peripheral part 24 of the collar part 21 surface-contact.
That is, the flange portion 21 extends to the outer peripheral side from the outer peripheral edge of the mover 3, and the outer peripheral portion 24 also exists on the outer peripheral side of the outer peripheral edge of the mover 3. Further, the surface 23b on the other end side in the axial direction of the inner peripheral portion 23 is a plane perpendicular to the axial direction. Furthermore, the surface 24a on the one end side in the axial direction of the outer peripheral portion 24 is also a plane perpendicular to the axial direction.

Then, by bringing the surfaces 24 a and 23 b into surface contact, the magnetic flux is transferred between the first magnetic body 9 and the second magnetic body 10 on the other axial end side of the coil 2.
In addition, since the inner peripheral part 23 and the outer peripheral part 24 do not form an uneven fitting or the like, the inner peripheral part 23 and the outer peripheral part 24 can be relatively moved in the radial direction at the time of positioning by the jig 15.
Further, the first delivery structure α is provided on one end side in the axial direction with respect to the second delivery structure β.

  In the linear solenoid 1, a notch 25 is provided so as to penetrate the other end side yoke 16 in the axial direction, and a terminal 26 of the coil 2 is drawn from the notch 25. And the 1st delivery structure (alpha) is provided in the axial direction one end side rather than the terminal 26. FIG.

The linear solenoid 1 includes a bearing 28, an output member 29, and a bobbin 30 described below.
The bearing 28 is fixed to the inner periphery of the mover 3 and is in direct sliding contact with the first stator 4, and the mover 3 is in sliding contact with the first stator 4 indirectly through the bearing 28. Moreover, the outer peripheral part of the bearing 28 is made of a magnetic material, and the inner peripheral part is made of a non-magnetic material. The inner peripheral surface that is in sliding contact with the outer peripheral surface of the first stator 4 is made of a nonmagnetic material.

  Here, in the linear solenoid 1, the axial length d of the region in which the magnetic flux can be transferred in the radial direction between the inner peripheral surface of the mover 3 and the outer peripheral surface of the first stator 4, The following magnitude relationship is established between the axial length e of the region in which the magnetic flux can be transferred in the radial direction between the outer peripheral surface of the stator 4 and the inner peripheral surface of the mover 3. (See FIG. 4). That is, this magnitude relationship is that the axial length d is smaller than the axial length e, and the axial length d substantially coincides with the axial length of the bearing 28. Yes.

  Further, the bearing 28 has a flange 32 that spreads from the other end in the axial direction to the outer peripheral side, and the flange 32 hits the inner peripheral portion 33 of the flange portion 21, thereby restricting the movement of the mover 3 toward the other end in the axial direction. Is done. Here, in the flange 32, a portion on one end side in the axial direction is made of a magnetic material, and a portion on the other end side is made of a non-magnetic material. The contact surface 32b that directly contacts the inner peripheral portion 33 is made of a nonmagnetic material.

  A plurality of grooves serving as breathing passages 34 for allowing fluid to flow in and out between the outer peripheral side and the inner peripheral side of the flange 32 are provided on the surface on the one axial end side of the inner peripheral portion 33. For example, the grooves are provided radially at an angular interval of 60 ° around the axis of the linear solenoid 1 (see FIG. 5).

The output member 29 is made of a non-magnetic material, is fixed to the mover 3, moves integrally with the mover 3 toward one end in the axial direction, and outputs thrust. The output member 29 receives a restoring force from an external device or the like, and moves to the other end side in the axial direction integrally with the mover 3 by the restoring force.
The output member 29 is a cylindrical portion that is fixed to the movable element 3 coaxially, and a columnar shape that protrudes toward one end in the axial direction (the side opposite to the side where the movable element 3 exists). And a shaft portion 37.

Here, the inner circumference of the mover 3 is expanded in a stepped shape on one end side in the axial direction, and the fixing portion 36 is press-fitted and fixed in the expanded diameter range. Further, the bearing 28 is pressed and fixed away from the other end in the axial direction from the fixed portion 36 in a range where the diameter is not expanded, and the bearing 28 and the fixed portion 36 form an axial gap f ( (See FIG. 2). The gap f communicates with the respiratory path 8.
Further, an opening 38 through which the shaft portion 37 passes is provided in the vicinity of the top portion of the lid portion 13, and the shaft portion 37 projects from the opening 38 toward one end in the axial direction, thereby outputting a thrust to an external device or the like.

  Furthermore, the shaft portion 37 has a smaller diameter than the fixed portion 36, and the shaft portion 37 and the fixed portion 36 are integrated by a tapered portion 39 that is reduced in diameter toward one end in the axial direction. Then, the distal end (one axial end) of the first stator 4 moves relatively in the axial direction on the inner periphery of the fixed portion 36. Here, the peripheral edge of the tip of the first stator 4 is chamfered so that the inner periphery of the tapered portion 39 is the first fixed even when the mover 3 and the output member 29 move to the other end in the axial direction. Do not touch the child 4.

The bobbin 30 is a resin member around which the coil 2 is wound, and has the following cylindrical portion 40 and two flanges 41a and 41b.
First, the cylindrical part 40 is a part where the coil 2 is wound around the outer periphery of the second and third stators 5 and 6. In addition, the flanges 41a and 41b respectively divide a region where the coil 2 is wound from the one end and the other end in the axial direction of the cylindrical portion 40 and is wound on the one end side and the other end side in the axial direction.

And the linear solenoid 1 is equipped with the one end side and other end side seal | sticker (gamma) and (delta) demonstrated below regarding the structure which protects the coil 2 from the fluid which penetrate | invaded inside.
First, the one end side seal γ is provided so as to surround the axial center of the coil 2 on one end side in the axial direction of the flange 41a. That is, an annular resin ridge 42a surrounding the axial center of the coil 2 is provided on the surface on one axial end side of the flange 41a (see FIG. 6). After the resin ridge 42a is melted with a molten resin, One end side seal γ is provided by solidifying.

  The other end side seal δ is provided so as to surround the axis of the coil 2 on the other axial end side of the flange 41b. That is, an annular resin ridge 42b surrounding the axis of the coil 2 is provided on the surface on the other axial end side of the flange 41b. The resin ridge 42b is melted with a molten resin and then solidified. A side seal γ is provided.

Here, the manufacturing method of the linear solenoid 1 includes an injection molding process of injecting molten resin to the coil 2, the first to third magnetic bodies 9 to 11, the bobbin 30 and the mounting bracket 43 to perform molding. It is. Then, the one end side and the other end side seals γ and δ and the connector 44 are formed by the molten resin injected in this injection molding step, and a groove into which the O-ring 45 is fitted is provided.
In addition, the injection port (not shown) of the molten resin in the injection molding step is disposed in a range g facing the first magnetic body 9 on the other axial end side of the first magnetic body 9 (see FIG. 3).

  Further, the other end side yoke 16 is provided in a shape that does not sterically interfere with the resin bump 42b. In other words, the intermediate portion 46 between the inner peripheral portion 23 and the outer peripheral portion 20 of the other end side yoke 16 swells toward the other end side in the axial direction, and the resin protuberance 42b is formed by the intermediate portion 46 and the flange 41b. A protruding space 47 is formed (see FIG. 3). The space 47 is filled with molten resin.

  Further, the linear solenoid 1 includes a through hole 49 that penetrates the third stator 6, and the through hole 49 communicates the inside of the linear solenoid 1 with the outside of the linear solenoid 1. Further, the through hole 49 opens to the inside of the linear solenoid 1 on the outer peripheral side of the inner peripheral wall 6a of the third stator 6, and is provided in parallel with the axis of the linear solenoid 1, for example. Further, a plurality of through holes 49 are provided around the axis of the coil 2, and are provided, for example, at an angular interval of 45 ° around the axis of the linear solenoid 1 (see FIG. 7).

  The linear solenoid 1 is mounted on the vehicle in a state in which the axial direction is substantially coincided with the horizontal direction and the intermediate direction between the two through holes 49 adjacent in the circumferential direction is directed vertically downward (at this time) The connector 44 protrudes vertically upward, and the bracket 43 protrudes vertically downward). Thereby, the liquid level of the fluid in the linear solenoid 1 is suppressed below the inner peripheral wall 6a of the third stator 6 (see FIG. 8).

  With the configuration as described above, in the linear solenoid 1, when the coil 2 is energized, magnetic flux is transferred in the radial direction between the first and second stators 4 and 5 and the mover 3, and further movable. Magnetic flux is transferred between the child 3 and the third stator 6 in the radial direction, and the mover 3 is attracted and moved toward one end in the axial direction. As a result, a thrust acting in the axial direction is output from the linear solenoid 1.

[Effects of Examples]
In the linear solenoid 1 according to the embodiment, the mover 3 is provided in a cylindrical shape, and the first and second stators 4 and 5 are arranged on the inner and outer peripheries of the mover 3, respectively. Magnetic flux is transferred from both to the mover 3 in the radial direction. The bobbin 30 is provided with resin ridges 42a and 42b on the surface on one end side in the axial direction of the flange 41a and on the surface on the other end side in the axial direction of the flange 41b. Then, the resin bulges 42a and 42b are respectively melted with a molten resin and then solidified to provide one end side and other end side seals γ and δ.

  As a result, oil, water, or the like can be prevented from reaching the coil 2 through the interface formed between the solidified resin and the bobbin 30. For this reason, a possibility that the coil 2 may be damaged by the oil, water, etc. which permeated from the outside can be reduced.

Further, in the other end side yoke 16 of the second magnetic body 10, the intermediate portion 46 swells toward the other end side in the axial direction and does not sterically interfere with the resin bulge 42 b.
As a result, the other end side seal δ can be provided while ensuring a molten resin filling region around the resin bump 42b.

In addition, the first delivery structure α is provided on one end side in the axial direction from the terminal 26 of the coil 2.
Thereby, the process of providing the notch 25 which pulls out the terminal 26 can be facilitated. That is, since the second magnetic body 10 is partially extended to the outer peripheral side as the other end side yoke 16, the notch 25 is provided so as to penetrate the other end side yoke 16 in the axial direction, and the terminal 26 is pulled out. Can do.

  Here, the operation of penetrating the tool or the like in the axial direction is easier than the operation of penetrating the tool or the like in the radial direction. When the first delivery structure α is provided on the other end side in the axial direction from the terminal 26, for example, it is necessary to provide the notch 25 so as to penetrate the outer peripheral side yoke 18 of the third magnetic body 11 in the radial direction. is there. Therefore, the first delivery structure α is provided on one end side in the axial direction from the terminal 26, and the notch 25 is provided so as to penetrate the other end side yoke 16 in the axial direction, thereby facilitating the process of providing the notch 25. be able to.

[Modification]
The configuration of the linear solenoid 1 is not limited to the embodiment, and various modifications can be considered.
That is, the mover 3, the first to third stators 4 to 6, the first to third magnetic bodies 9 to 11, the first and second delivery structures α and β, the through hole 49, the bearing 28, the respiratory path 8, 34, the output member 29, the lead-out structure of the terminal 26, the magnitude relationship between the axial length d and the axial length e, the inner peripheral diameter a of the third stator and the inner peripheral diameter b of the second stator 5 Various modes can be adopted with respect to the magnitude relationship and the sliding support structure of the movable element 3 and the output member 29 integrally.

For example, according to the linear solenoid 1 of the embodiment, the sliding support structure of the mover 3 and the output member 29 integrally is the first stator 4 that slides and supports the mover 3 from the inner peripheral side. However, the movable element 3 may be slidably supported from the outer peripheral side by the second stator 5, and the output member 29 may be slidably supported.
Further, according to the linear solenoid 1 of the embodiment, the respiratory path 34 is provided in the buttocks 21 of the first magnetic body 9, but the respiratory path 34 may be provided in the flange 32 of the bearing 28. A breathing path 34 may be provided on both of the flanges 32.

1 Linear Solenoid 2 Coil 3 Movable Element 4 First Stator 5 Second Stator 6
3rd stator 30 Bobbin 40 Cylindrical part (cylinder part) 41a, 41b Flange 42a, 42b Resin protrusion γ, δ One end side, other end side seal

Claims (3)

In the linear solenoid (1) that outputs the thrust acting in the axial direction using the magnetic flux generated by energizing the coil (2),
A mover (3) having a cylindrical magnetic part and being movably incorporated in the axial direction coaxially with the coil (2) on the inner periphery of the coil (2);
A first stator (4) made of a magnetic material that is arranged on the inner peripheral side of the cylindrical magnetic portion of the mover (3) and transfers magnetic flux in the radial direction to the mover (3);
It is a cylindrical magnetic part and is arranged on the outer peripheral side of the mover (3), sandwiches the mover (3) in the radial direction together with the first stator (4), and has a diameter on the mover (3). A second stator (5) for passing magnetic flux in the direction;
A third stator (6) made of a magnetic material, which is arranged away from the second stator (5) in the axial direction and magnetically attracts the movable element (3) in the axial direction;
The resin-made cylinder part (40) which is arrange | positioned at the outer peripheral side of the said 2nd stator (5), and the said coil (2) is wound, and it is provided in the axial direction both ends of this cylinder part (40), and the said coil A bobbin (30) having two flanges (41a, 41b) made of resin that divides a region around which (2) is wound in the axial direction;
Of the two surfaces of the flange (41a) at one end in the axial direction, an annular resin ridge (42a) which is provided on the surface at one end in the axial direction and surrounds the axis of the coil (2) is melted by the molten resin. Then, one end side seal (γ) provided by solidifying,
Of the two surfaces of the flange (41b) on the other end side in the axial direction, an annular resin ridge (42b) that is provided on the surface on the other end side in the axial direction and surrounds the axial center of the coil (2) is molten resin. A linear solenoid (1) provided with the other end side seal (δ) provided by being melted and solidified. The linear solenoid (1) according to claim 1,
Another magnetic part (16) provided integrally with the second stator (5) and another magnetic part (19) provided integrally with the third stator (6) are brought into contact with each other to generate magnetic flux. The other magnetic portion (16) on the second stator (5) side extends to the outer peripheral side on the other axial end side of the coil (2), and on the other end side in the axial direction. A first delivery structure (α) for delivering a magnetic flux in contact with another magnetic part (19) on the third stator (6) side on the outer peripheral side of the flange (41b);
The other magnetic part (16) on the second stator (5) side is provided in a shape that does not sterically interfere with the resin ridge (42b) that forms the other end side seal (δ). Characteristic linear solenoid (1). In the linear solenoid (1) according to claim 1 or 2,
Another magnetic part (16) provided integrally with the second stator (5) and another magnetic part (19) provided integrally with the third stator (6) are brought into contact with each other to generate magnetic flux. The other magnetic portion (16) on the second stator (5) side extends to the outer peripheral side on the other axial end side of the coil (2), and on the other end side in the axial direction. A first delivery structure (α) for delivering a magnetic flux in contact with another magnetic part (19) on the third stator (6) side on the outer peripheral side of the flange (41b);
The first delivery structure (α) is provided on one end side in the axial direction with respect to the terminal (26) of the coil (2), and the linear solenoid (1).

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