JP5720638B2 - Linear solenoid - Google Patents

Description

  The present invention relates to a linear solenoid.

  There is known a linear solenoid that linearly moves a mover core by a magnetic field generated when energizing a stator coil. In the linear solenoid disclosed in Patent Document 1, the first stator core forms an annular protrusion protruding toward the second stator core, and the second stator core is cylindrical at a position sandwiching an air gap with respect to the annular protrusion. A magnetic transmission part. A mover core capable of reciprocating in the axial direction is provided between the first stator core and the second stator core. When the coil is not energized, the mover core is positioned in the radially inward direction of the magnetic transmission portion of the second stator core. When the coil is energized, the mover core moves to the annular protrusion side of the first stator core by the magnetic attractive force. The axial overlap amount between the mover core and the magnetic transmission part of the second stator core decreases as the mover core moves toward the annular protrusion.

JP 2011-222799 A

  By the way, when the coil is energized, a magnetic attractive force that pulls toward the second stator core in the axial direction acts on the mover core. The magnetic attraction force pulled toward the second stator core reduces the amount of axial overlap between the mover core and the magnetic transmission portion of the second stator core, and the magnetic transmission between the mover core and the second stator core. The density increases as the density of magnetic flux transmitted to the part increases. In particular, it increases rapidly in the second half of the stroke from the second stator core toward the first stator core. Therefore, there is a problem that the total magnetic attractive force acting on the mover core varies greatly according to the stroke.

To address the above problem, the magnetic transmission portions of the mover core and the second stator core are elongated toward the first stator core, and the axial position of the first stator core is shifted so that the air gap is maintained. Thus, a measure to increase the amount of overlap in the axial direction between the mover core and the magnetic transmission part of the second stator core can be considered, but this measure has a drawback that the size of the linear solenoid is increased.
The present invention has been made in view of the above points, and an object of the present invention is to provide a linear solenoid capable of suppressing fluctuations in the total magnetic attractive force due to stroke changes without increasing the physique.

The linear solenoid according to the present invention includes a first stator core and a second stator core, and a first stator core and a second stator core, which are arranged so as to have an air gap therebetween in the radial direction of the coil. A non-magnetic member located between the first stator core and the second stator core, and a yoke that magnetically connects the first stator core and the second stator core to each other. The first stator core and the second stator core can move in the axial direction. And a shaft and a mover core supported by each other.
The nonmagnetic member is located between the first stator core and the second stator core and prohibits the relative movement of the first stator core and the second stator core in a direction in which they approach each other. The first stator core and the second stator core are fitted to both the first stator core and the second stator core to prevent the first stator core and the second stator core from moving relative to each other in the radial direction.
Yaw click includes a cylindrical portion that secure the first stator core located radially outside of the coil, is formed integrally at one end of the second stator core side of the cylindrical portion, the second stator including a bottom portion, the at least a portion of the core has an inserted hole.
The second stator core is a cylindrical magnetic member that is located in a radially outward direction of the bearing portion supporting the shaft and spaced from the first stator core. It has a transmission part, and a connecting part that connects the inside of the end portion on the bottom side of the magnetic transmission part and the bearing part, and is inserted into a hole in the bottom part.
The outer diameter of the end on the bottom side of the magnetic transmission portion is in axial contact with the edge of the hole in the bottom. The bottom portion is capable of magnetic transmission in the axial direction with the second stator core.
The first stator core is fitted in the other end portion of the cylindrical portion, and is capable of magnetic transmission in the radial direction between the first stator core and the cylindrical portion.
A first gap, which is a radial gap, is provided between the inner surface of the bottom hole and the connecting portion.

  Accordingly, the axial length of the mover core can be increased by the amount that the second stator core is inserted into the hole at the bottom of the yoke. Therefore, in the second half of the stroke, the amount of overlap in the axial direction between the mover core and the magnetic transmission part of the second stator core is increased, and transmission is performed between the mover core and the magnetic transmission part of the second stator core. Therefore, it is possible to prevent an abrupt increase in the magnetic attractive force that is pulled toward the second stator core in the axial direction. Therefore, it is possible to suppress the fluctuation of the total magnetic attractive force due to the stroke change without increasing the physique.

  In addition, the non-magnetic member prohibits the first stator core and the second stator core from moving relative to each other and reduces the variation in the axial dimension of the air gap. Variations can be suppressed.

It is a figure explaining the schematic structure of the valve timing adjustment apparatus to which the linear solenoid by 1st Embodiment of this invention was applied. It is sectional drawing which shows the linear solenoid of FIG. 1, Comprising: The shaft has shown the state located in the original position. It is sectional drawing which shows the linear solenoid of FIG. 1, Comprising: The state in which the shaft is located in a full stroke position is shown. It is an enlarged view of the arrow IV part of FIG. It is an enlarged view of the arrow V part of FIG. FIG. 3 is a cross-sectional view showing a subassembly in which the first stator core, the collar, the second stator core, the shaft, and the mover core of FIG. 2 are assembled together. It is sectional drawing which shows the yoke of FIG. 2, a coil part, and a housing. FIG. 8 is a cross-sectional view illustrating a state in which the subassembly of FIG. 6 is inserted into the coil portion and the yoke of FIG. 7. It is an enlarged view of the arrow IX part of FIG. It is a figure which shows the relationship between the stroke which the needle | mover core of FIG. 2 goes to a full stroke position from an original position, and the total magnetic attraction force which acts on a needle | mover core. It is sectional drawing which shows the linear solenoid by 2nd Embodiment of this invention. It is sectional drawing which shows the linear solenoid by 3rd Embodiment of this invention. It is sectional drawing which shows the linear solenoid by 4th Embodiment of this invention. It is sectional drawing which shows the linear solenoid by 5th Embodiment of this invention. It is the XV-XV sectional view taken on the line of FIG.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In the embodiments, substantially the same components are denoted by the same reference numerals and description thereof is omitted.
(First embodiment)
FIG. 1 shows a valve timing adjusting device to which a linear solenoid according to a first embodiment of the present invention is applied. The valve timing adjustment device 100 relatively rotates the vane rotor 104 that rotates integrally with the camshaft 103 by supplying hydraulic oil to the hydraulic chamber 102 in the case 101 that rotates integrally with the crankshaft of the internal combustion engine (not shown). The opening / closing timing of an intake / exhaust valve (not shown) is adjusted. Hydraulic oil pumped up from the oil pan 105 by the oil pump 106 is supplied to the hydraulic chamber 102 through the hydraulic switching valve 107. The spool 108 of the hydraulic switching valve 107 is provided so as to be reciprocally movable in the axial direction within the sleeve 109, and is urged to one side in the axial direction by a spring 110. The linear solenoid 1 is used as a drive unit that drives the spool 108 to the other side in the axial direction against the urging force of the spring 110.

First, a schematic configuration of the linear solenoid 1 will be described with reference to FIGS.
The linear solenoid 1 includes a coil portion 10, a yoke 15, a housing 20, a first stator core 25, a second stator core 30, a shaft 35, a mover core 40, and the like.

The coil unit 10 includes a cylindrical bobbin 11 and an annular coil 12 made of an electric wire wound around the bobbin 11.
The yoke 15 is made of a magnetic material, and has a cylindrical portion 16 that is positioned in the radially outward direction of the coil portion 10 and a bottom portion 17 that is integrally formed at one end of the cylindrical portion 16.

  The housing 20 is a resin member in which the coil portion 10 and the yoke 15 are molded. The housing 20 forms a connector portion 22 that includes a terminal 21 that is electrically connected to the coil 12 and an attachment portion 23 that is used when attaching to an engine cover (not shown), for example.

  The first stator core 25 is made of a magnetic material, and is located on one side of the coil 12 in the axial direction, that is, on the other end side of the cylindrical portion 16. The first stator core 25 forms a first annular protrusion 28 that protrudes toward the bottom 17 side of the yoke 15, and the radially outer end is fixed to the cylindrical portion 16 of the yoke 15.

  The second stator core 30 is made of a magnetic material, and is located on the other side in the axial direction of the coil 12, that is, on one end portion side of the cylindrical portion 16. The second stator core 30 abuts against the bottom portion 17 of the yoke 15 in the axial direction, and the first annular projection 28 is spaced from the first annular projection 28 of the first stator core 25. A second annular protrusion 33 protruding to the side is formed. The first stator core 25 and the second stator core 30 are magnetically connected by the yoke 15.

  The shaft 35 is supported by the first stator core 25 and the second stator core 30 in the radial direction of the air gap 47, and the original position on the second stator core 30 side and the full on the first stator core 25 side are supported. It can reciprocate in the axial direction between the stroke positions. FIG. 2 shows a state where the shaft 35 is located at the original position, and FIG. 3 shows a state where the shaft 35 is located at the full stroke position.

  The mover core 40 is made of a magnetic material, is positioned between the first stator core 25 and the second stator core 30, and is fixed to the shaft 35. When the shaft 35 is located at the original position, the mover core 40 is located on the second stator core 30 side with respect to the air gap 47. When the shaft 35 is located at the full stroke position, the mover core 40 is located in the radially inward direction of the air gap 47 so as to straddle the first annular protrusion 28 and the second annular protrusion 33 in the axial direction. The first annular protrusion 28 and the second annular protrusion 33 are magnetically bypassed.

Next, the characteristic configuration of the linear solenoid 1 will be described with reference to FIGS.
The second stator core 30 includes a bearing portion 31 that supports the shaft 35, a cylindrical magnetic transmission portion 32 that is positioned radially outward of the bearing portion 31, and the bottom 17 side of the magnetic transmission portion 32. It has a connecting portion 34 that connects the inner diameter portion 36 of the end portion and the bearing portion 31, and is constituted by one member. The end on the bottom 17 side of the magnetic transmission part 32 has a bowl shape. The magnetic transmission part 32 forms a second annular protrusion 33 projecting toward the first annular protrusion 28 so as to separate the air gap 47 from the first annular protrusion 28.

  The linear solenoid 1 includes a cylindrical collar 45 positioned between the first stator core 25 and the second stator core 30. The collar 45 is made of a nonmagnetic material and corresponds to a “nonmagnetic member” recited in the claims. One end of the collar 45 is press-fitted into the first annular protrusion 28, the other end is press-fitted into the second annular protrusion 33, and the axial direction and the radial direction of the first stator core 25 and the second stator core 30 are both Relative movement is prohibited.

  The bottom portion 17 of the yoke 15 has a hole 18 into which a part of the connecting portion 34 of the second stator core 30 on the bottom portion 17 side is inserted. The hole 18 is a bottomed hole, that is, a stepped shape. Further, the bottom portion 17 of the yoke 15 sandwiches the collar 45 and the magnetic transmission portion 32 of the second stator core 30 between the first stator core 25 in the axial direction. The outer diameter 37 of the end of the second stator core 30 on the bottom 17 side in the magnetic transmission part 32 is in contact with the edge 19 of the hole 18 in the bottom 17 of the yoke 15 in the axial direction. The bottom portion 17 of the yoke 15 is capable of magnetic transmission in the axial direction with the magnetic transmission portion 32 of the second stator core 30.

  The first stator core 25 is formed in an annular and plate shape, is fitted into the other end portion of the cylindrical portion 16 of the yoke 15, and the collar 45 and the second stator core 30 are between the bottom portion 17 of the yoke 15. The magnetic transmission portion 32 is fixed to the yoke 15 by caulking while being sandwiched in the axial direction. The first stator core 25 is capable of magnetic transmission in the radial direction between the first stator core 25 and the cylindrical portion 16 of the yoke 15. The minimum radial dimension X1 of the first gap 51 between the inner surface of the hole 18 of the yoke 15 shown in FIG. 4 and the connecting portion 34 of the second stator core 30 is the same as that of the cylindrical portion 16 of the yoke 15 shown in FIG. It is larger than the maximum radial direction dimension X <b> 2 of the second gap 52 with the child core 25. Further, the minimum radial direction dimension X3 of the second gap 53 between the bobbin 11 and the collar 45 and the second stator core 30 shown in FIG. 4 is larger than the maximum radial direction dimension X2 of the second gap 52 shown in FIG.

  The mover core 40 includes a holding portion 41 that holds the shaft 35 and a cylindrical magnetic transmission portion 42 that extends from the holding portion 41 toward the bottom 17 of the yoke 15. The magnetic transmission part 42 is located between the bearing part 31 of the second stator core 30 and the magnetic transmission part 32, and between the coupling part 34 of the second stator core 30 when the shaft 35 is located at the original position. Are formed so as to have a slight axial gap. In other words, the magnetic transmission portion 42 can be moved to the bottom 17 side of the yoke 15 as long as the shaft 35 does not contact the connecting portion 34 of the second stator core 30 while the shaft 35 moves between the original position and the full stroke position. It extends as long as possible.

When the linear solenoid 1 is assembled, the collar 45 is press-fitted into the first annular protrusion 28 and the second annular protrusion 33, so that the first stator core 25, the second stator core 30, and the shaft as shown in FIG. 35 and the mover core 40 are assembled together to form a subassembly 48.
In the subassembly 48, first, as shown in FIG. 7, the magnetic transmission part 32 of the second stator core 30 is axially arranged in the yoke 15 and the coil part 10 as shown in FIG. It is inserted into the coil portion 10 and the yoke 15 until it contacts the edge portion 19 of the hole 18. At this stage, since the minimum radial direction dimension X1 of the second gap 52 and the minimum radial direction dimension X3 of the second gap 53 are both set larger than the maximum radial direction dimension X2 of the first gap 51, the subassembly 48 can be inserted into the coil portion 10 and the yoke 15 without interfering with the bobbin 11 and the yoke 15. Next, the punch 111 shown in FIG. 9 is used, and the other end portion of the cylindrical portion 16 of the yoke 15 is caulked as shown in FIG. 5 while the second stator core 30 is in contact with the yoke 15 in the axial direction. The outer diameter of the first stator core 25 is fixed to the cylindrical portion 16 of the yoke 15.

Next, the operation of the linear solenoid 1 will be described with reference to FIGS.
When hydraulic oil is not supplied to the hydraulic chamber 102 of the valve timing adjusting device 100, the coil 12 is not energized. At this time, the shaft 35 is urged through the spool 108 by the spring 110 of the hydraulic switching valve 107 and abuts against the bottom 17 of the yoke 15 to be in the original position.

  When hydraulic fluid is supplied to the hydraulic chamber 102 of the valve timing adjusting device 100, the coil 12 is energized. The magnetic flux generated around the coil 12 by energization passes through a magnetic circuit including the first stator core 25, the yoke 15, the second stator core 30, and the mover core 40. Magnetic flux transmission between the first stator core 25 and the yoke 15 is performed in the radial direction, and magnetic flux transmission between the yoke 15 and the second stator core 30 is performed in the axial direction. At this time, the mover core 40 moves the shaft 35 to the full stroke position side against the urging force of the spring 110 by the total magnetic attraction generated according to the amount of magnetic flux.

  Here, as shown by the broken line in FIG. 10 showing the relationship between the stroke of the mover core from the original position to the full stroke position and the total magnetic attraction force, in the comparative form in which the bottom of the yoke does not have a hole In the second half of the stroke, the total magnetic attractive force drops. On the other hand, as shown by the solid line in FIG. 10, in the case of the first embodiment, the total magnetic attraction force does not drop in the second half of the stroke, and there is no significant fluctuation.

As described above, in the linear solenoid 1 according to the first embodiment, the bottom portion 17 of the yoke 15 has the hole 18 into which a part on the bottom portion 17 side of the connecting portion 34 of the second stator core 30 is inserted. ing.
Accordingly, the axial length of the magnetic transmission portion 42 of the mover core 40 can be increased by the amount that the second stator core 30 is inserted into the hole 18 in the bottom portion 17 of the yoke 15. Therefore, in the second half of the stroke of the mover core 40, the axial overlap amount between the mover core 40 and the magnetic transmission part 32 of the second stator core 30 increases, and the mover core 40 and the second stator core 30 are increased. Since the increase in the density of the magnetic flux transmitted to and from the magnetic transmission unit 32 is suppressed, it is possible to prevent a sudden increase in the magnetic attractive force that is pulled toward the second stator core 30 in the axial direction. Therefore, it is possible to suppress the fluctuation of the total magnetic attractive force due to the stroke change without increasing the physique.
In the first embodiment, since the hole 18 is a bottomed hole, the rigidity of the yoke 15 can be ensured.

In the first embodiment, one end of the collar 45 is press-fitted into the first annular protrusion 28, and the other end is press-fitted into the second annular protrusion 33, and the first stator core 25 and the second stator core 30 are pressed. Relative movement in the axial and radial directions is prohibited.
Therefore, since the variation in the axial dimension of the air gap 47 is reduced, the variation in the total magnetic attractive force can be suppressed.
Further, since the eccentricity between the first stator core 25 and the second stator core 30 constituting the magnetic circuit is suppressed, the radial force acting on the mover core 40, that is, the side force can be reduced. Therefore, the magnetic attractive force can be stabilized, wear of the bearing portion 26 and the bearing portion 31 sliding with the shaft 35 can be reduced, and the coaxiality between the bearing portion 26 and the bearing portion 31 can be improved. The shaft can be smoothly slid.

In the first embodiment, when the linear solenoid 1 is assembled, the collar 45 is press-fitted into the first annular protrusion 28 and the second annular protrusion 33, whereby the first stator core 25 and the second stator core 30. The shaft 35 and the mover core 40 are assembled together.
Therefore, the linear solenoid 1 can be easily assembled.

In the first embodiment, the bottom portion 17 of the yoke 15 sandwiches the collar 45 and the magnetic transmission portion 32 of the second stator core 30 in the axial direction between the first stator core 25 and the second stator core. Magnetic transmission is possible in the axial direction between 30 magnetic transmission units 32.
Therefore, the axial air gap between the second stator core and the bottom of the yoke is constant even if the radial position between the second stator core and the bottom of the yoke varies due to the dimensional variation between the individuals. It is possible to reduce variation in magnetic attraction force between individuals.

In the first embodiment, the outer diameter 37 of the end portion on the bottom portion 17 side of the magnetic transmission portion 32 of the second stator core 30 extends axially to the edge portion 19 of the hole 18 in the bottom portion 17 of the yoke 15. It is in contact.
Therefore, the contact area between the second stator core 30 and the bottom portion 17 of the yoke 15 can be increased, and magnetic transmission can be performed in a larger area.

In the first embodiment, the minimum radial direction dimension X 1 of the first gap 51 and the minimum radial direction dimension X 3 of the second gap 53 are larger than the maximum radial direction dimension X 2 of the second gap 52.
Therefore, when assembled, the subassembly 48 can be inserted into the coil portion 10 and the yoke 15 without interfering with the bobbin 11 and the yoke 15. That is, even when the relative movement in the radial direction between the first stator core 25 and the second stator core 30 is restricted by the collar 45, each core mechanically interferes with the yoke 15 and cannot be assembled. There is no. In addition, since it is not necessary to set a large radial clearance between the first stator core 25 and the yoke 15 in consideration of interference, the air gap between the first stator core 25 and the yoke 15 is reduced and the total magnetic attractive force is reduced. Can be increased.

In the first embodiment, the first stator core 25 is fitted in the other end portion of the cylindrical portion 16 of the yoke 15 and can be magnetically transmitted to and from the cylindrical portion 16 in the radial direction.
Therefore, the axial position of the first stator core 25 and the cylindrical portion 16 of the yoke 15 varies due to the influence of the dimensional variation among the first stator core 25, the second stator core 30, the collar 45, and the yoke 15. However, since the radial air gap between the first stator core 25 and the cylindrical portion 16 of the yoke 15 is constant, it is possible to reduce the variation in magnetic attraction force between individuals.

(Second Embodiment)
A linear solenoid according to a second embodiment of the present invention will be described with reference to FIG.
In the linear solenoid 55, the bottom wall of the hole 18 in the bottom 57 of the yoke 56 has a through hole 58 penetrating in the axial direction.
The second embodiment has the same effects as the first embodiment. Furthermore, in the second embodiment, when the hole 18 which is a bottomed hole is formed by press working, the thickness can be removed by using the through hole 58, so that the yoke 56 can be manufactured relatively easily.

(Third embodiment)
A linear solenoid according to a third embodiment of the present invention will be described with reference to FIG.
In the linear solenoid 60, the bottom portion 62 of the yoke 61 has a through hole 63 into which a part of the connecting portion 65 of the second stator core 64 on the bottom portion 62 side is inserted.
The third embodiment has the same effects as the first embodiment. Furthermore, in the third embodiment, the bottom portion 62 of the yoke 61 has a through hole 63, and the axial length of the magnetic transmission portion 67 of the mover core 66 can be made longer than in the first embodiment. It is possible to further suppress fluctuations in the magnetic attractive force.

(Fourth embodiment)
A linear solenoid according to a fourth embodiment of the present invention will be described with reference to FIG.
In the linear solenoid 70, the magnetic transmission portion 72 of the second stator core 71 has a constant radial dimension from the end on the bottom 62 side to the intermediate portion. That is, the end of the magnetic transmission part 72 on the bottom 62 side is not bowl-shaped.
The fourth embodiment has the same effect as the first embodiment.

(Fifth embodiment)
A linear solenoid according to a fifth embodiment of the present invention will be described with reference to FIGS.
In the linear solenoid 75, the bottom wall of the hole 18 in the bottom 77 of the yoke 76 has a through hole 79 penetrating in the axial direction. The shaft 35 can abut on a cross-shaped connecting portion 78 that forms the bottom wall of the hole 18.
The fifth embodiment has the same effects as the first embodiment. Furthermore, in the fifth embodiment, when the hole 18 that is a bottomed hole is formed by press working, the through hole 79 can be used to remove the thickness, so that the yoke 76 can be manufactured relatively easily. In the fifth embodiment, the rigidity of the peripheral portion of the yoke 76 around the hole 18 is increased by the connecting portion 78 as compared to the peripheral portion of the hole 61 of the yoke 61 in the fourth embodiment.

(Other embodiments)
In another embodiment of the present invention, the fixing of the first stator core and the yoke is not limited to caulking, and may be performed, for example, by press fitting.
In another embodiment of the present invention, the magnetic flux transmission between the first stator core and the yoke may be performed in the axial direction. In this case, the radial relative movable range between the first stator core and the yoke may be set larger than the radial relative movable range between the second stator core and the yoke. .
In another embodiment of the present invention, the first stator core may not be fitted in the cylindrical portion of the yoke. When the first stator core is not fitted into the cylindrical portion of the yoke, the first stator core and the yoke may be fixed by, for example, winding caulking.
In another embodiment of the present invention, the first stator core may be configured such that the bearing portion and the fixed portion are separate.
In other embodiments of the present invention, one and both of the first and second stator cores may not form an annular protrusion. In short, the first stator core and the second stator core may be provided so that an air gap is formed between them.
In another embodiment of the present invention, the first stator core, the second stator core, and the yoke may not have a circular cross-sectional shape, and a notch or the like is formed in a part of the circumferential direction. Also good.

In other embodiments of the present invention, the collar may not be cylindrical. The collar may be, for example, a rod shape or a plate shape as long as it suppresses the relative movement of the first stator core and the second stator core in the direction of approaching each other.
In other embodiments of the present invention, the collar may be fitted to the first and second stator cores rather than press fit. As a result, the collar does not have to be integrally assembled with the first stator core, the second stator core, the shaft, and the mover core.
In another embodiment of the present invention, the linear solenoid is not limited to the drive unit of the hydraulic switching valve of the valve timing adjusting device, but can be applied as a drive unit of various functional products having driven members that can reciprocate.
The present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention.

1, 55, 60, 70, 75 ... Linear solenoid 12 ... Coil 15, 56, 61, 76 ... York 16, ...・ ・ ・ ・ ・ ・ ・ Cylinder part 17, 57, 62, 77 ・ ・ ・ ・ ・ Bottom part 18, 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hole 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.. First stator core 30, 64, 71 ... Second stator core 47 ... Air gap 35 ...・ ・ ・ ・ ・ ・ ・ Shaft 40, 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mover core 45 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Color (non-magnetic member)

Claims (5)

An annular coil (12);
A first stator core (25) located on one side in the axial direction of the coil;
A second stator core (30, 64, 71) disposed so as to separate an air gap (47) from the first stator core on the other side in the axial direction of the coil;
A yoke (15, 56, 61, 76) located in a radially outward direction of the coil and magnetically connecting the first stator core and the second stator core to each other;
It is supported by the first stator core and the second stator core in the radial direction of the air gap, and the original position on the second stator core side and the full stroke position on the first stator core side A shaft (35) reciprocally movable in the axial direction between,
The first stator core and the second stator core are fixed to the shaft, and when the coil is energized, the first stator core and the second stator core are magnetically bypassed. A mover core (40, 66) that moves in the radial direction of the air gap and moves the shaft to the full stroke position side,
The first stator core and the second stator core are located between the first stator core and the second stator core, and the first stator core and the second stator core are prohibited from relatively moving in a direction approaching each other , and A nonmagnetic member that fits into both the first stator core and the second stator core and prevents the first stator core and the second stator core from moving relative to each other in the radial direction ( 45)
With
The yoke is formed integrally with a cylindrical portion (16) that is positioned radially outward of the coil and that fixes the first stator core, and one end of the cylindrical portion on the second stator core side. are, see containing bottom at least a part has a hole (18,63) which is inserted (17,57,62,77), the one of the second stator core,
The second stator core is disposed so as to separate the air gap between the bearing portion (31) supporting the shaft and the radial direction of the bearing portion and the first stator core. A cylindrical magnetic transmission portion (32, 72) that is connected to the inner diameter (36) of the end portion on the bottom side of the magnetic transmission portion and the bearing portion, and is inserted into the hole. Part (34),
The outer diameter (37) of the end on the bottom side of the magnetic transmission part is in axial contact with the edge (19) of the hole in the bottom,
The bottom portion is capable of magnetic transmission in the axial direction with the second stator core,
The first stator core is fitted into the other end portion of the cylindrical portion, and is capable of magnetic transmission in the radial direction between the first stator core and the cylindrical portion,
A linear solenoid (1, 55, 60, 70, 75) characterized in that a first gap (51), which is a radial gap, is provided between the inner surface of the hole and the connecting portion . Minimum diameter dimension of the first gap between the inner surface and the second stator core of the bore (51) (X1), the second gap between the first stator core and the cylindrical portion of the yoke (52 linear solenoid according to any one of claims 1 and greater than the maximum radial dimension (X2)) of (1,55,60,70,75). The linear solenoid (1, 55, 75) according to claim 1 or 2 , characterized in that the hole (18) is a bottomed hole. The linear solenoid (55, 75) according to claim 3 , wherein the bottom wall of the hole (18) has a through hole (58, 79) penetrating in the axial direction. The linear solenoid (60, 70) according to claim 1 or 2 , wherein the hole (63) is a through hole.

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