JP6439457B2 - solenoid - Google Patents

Description

  The present invention relates to a solenoid, and more particularly to a solenoid having a configuration capable of self-holding the position of a movable magnetic pole.

  In a so-called self-holding type solenoid, a permanent magnet is provided in order to integrally hold the position of the movable magnetic pole. From the standpoint of self-maintenance, such a permanent magnet is configured so that the movable magnetic pole abuts on the permanent magnet so that the magnetic flux generated by the permanent magnet does not leak to the outside and flows through the movable magnetic pole as much as possible. preferable. However, if the movable magnetic pole is disposed so as to directly collide with the permanent magnet, noise is generated when the permanent magnet is struck, and undesirable effects such as cracking or chipping of the permanent magnet occur. Some permanent magnets are made from materials that are less prone to cracking or chipping, but such materials are relatively expensive. In view of this, an invention has been made to prevent the permanent magnet from having such an influence.

FIG. 17 is a schematic cross-sectional view of a solenoid according to the prior art, in which (a) shows a retracted state and (b) shows an energized state. In FIG. 17, 201 is a solenoid, 202 is a coil, 203 is a movable magnetic pole, 204 is a stopper, 205 is a yoke, 206 is a permanent magnet, and 207 is a spring.
It is.

  FIG. 17 is an invention disclosed in Japanese Patent Application Laid-Open No. 2004-288909. The solenoid 201 reports the flow of magnetic flux around the movable magnetic pole 203, the stopper 204, the yoke 205 and the permanent magnet 206 when a current flows through the coil 202 in the retracted state shown in FIG. The movable magnetic pole 203 slides inside the coil 202 against the elastic force of the spring 207 and stops when it collides with the stopper 204. When colliding with the movable magnetic pole 203 and the stopper 204, the movable magnetic pole 203 is made of plastic, and the stopper 204 is made of a rubber magnet. Therefore, the collision sound is smaller than when the movable magnetic pole 203 is made of a metal such as iron.

  According to the above configuration, it is possible to suppress noise generated each time the coil 202 is energized. However, the rubber magnet has a smaller attractive force than a metal permanent magnet and a smaller force for holding the movable magnetic pole. If such a solenoid is used in an environment where there is external vibration or impact, the movable magnetic pole may be separated from the rubber magnet stopper. Increasing the rubber magnet stopper increases the attractive force, but causes a secondary problem such as an increase in the overall length of the solenoid or an increase in the volume of the entire solenoid.

JP 2004-288909 A

  In order to solve the above problems, the present invention can secure a sufficient holding force for keeping the movable magnetic pole at a predetermined position in the solenoid capable of self-holding the movable magnetic pole, and at the same time, the total length of the solenoid is increased. An object of the present invention is to provide a solenoid that does not increase the volume of the entire solenoid.

  The invention according to claim 1 is formed in a substantially cylindrical shape, a case provided with a first opening and a second opening, a coil provided inside the case, and a substantially cylindrical shape. A stationary magnetic pole provided near the second opening inside the case, and a standby position farthest away from the stationary magnetic pole by being attracted to the stationary magnetic pole when the coil is energized A movable magnetic pole provided so as to slide away from the fixed magnetic pole and return to the standby position when energization of the coil is stopped, and the first opening of the case An end cap provided to close the portion, and provided inside the end cap so as to oppose the end of the movable magnetic pole, and attracts the movable magnetic pole when the movable magnetic pole is in the standby position. The movable magnetic pole is A permanent magnet that is held in the machine position, and a flexible magnet that is disposed on the inner side surface of the end cap and that surrounds the permanent magnet and protrudes toward the movable magnetic pole with respect to the permanent magnet. A solenoid having a muffler member.

  According to a second aspect of the present invention, in the first aspect of the present invention, the end cap is formed with a recessed portion or a through hole at a portion facing the end of the movable magnetic pole, and the permanent magnet has the end. The solenoid is fitted into the recessed portion or the through hole of the cap.

  According to a third aspect of the present invention, in the second aspect of the present invention, the end cap is formed in a substantially cylindrical shape so as to extend in the central axis direction of the movable magnetic pole, and the movable magnetic pole is A cylindrical portion slidably provided inside, a flange-like portion provided at an end of the cylindrical portion on the case side and fixed to the first opening of the case, and the cylindrical shape Provided at the end of the part opposite to the case side so as to close the end of the cylindrical part and having a bottom part in which the recessed part or the through hole is formed, In the central axis direction of the movable magnetic pole, the inner diameter of the region from the end on the bottom side to a predetermined position separated by a length equal to or approximately equal to the thickness of the silencer member is formed to a predetermined inner diameter equal to or approximately equal to the diameter of the silencer member From the predetermined position The inner diameter of the region up to the end on the part side is formed to be smaller than the diameter of the silencer member, and the silencer member is equal to the thickness of the silencer member from the bottom side end of the cylindrical part Alternatively, the solenoid is held in the region up to the predetermined position separated by an approximately equal length.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the cylindrical portion further formed in a substantially cylindrical shape and extending in the central axis direction of the movable magnetic pole, and the cylindrical portion And an auxiliary magnetic pole provided at the end opposite to the movable magnetic pole and having a hook-shaped lid fixed to the second opening of the case, and formed in a substantially disc shape, Another permanent magnet disposed so as to be interposed between the fixed magnetic pole and the auxiliary magnetic pole, a substantially cylindrical shape, and the inner diameter of the first portion near the end on the movable magnetic pole side is the first The inner portion of the first portion and the inner portion of the second portion are formed to be smaller than the inner diameter of the second portion on the opposite side of the movable magnetic pole side than the portion. A fixed magnetic pole holding member having an inner circumferential step surface formed at the boundary thereof, and the fixed magnetic pole is on the movable magnetic pole side The first columnar part is formed to have a larger diameter than the second columnar part opposite to the movable magnetic pole, and the outer peripheral surface of the first columnar part and the second circle A stepped surface is formed at the boundary with the outer peripheral surface of the columnar portion, and the fixed magnetic pole holding member includes the cylindrical portion of the auxiliary magnetic pole, the other permanent magnet, and the first cylindrical portion of the fixed magnetic pole. The auxiliary magnetic pole, the other permanent magnet, and the fixed magnetic pole are integrated with each other by being press-fitted from the second cylindrical portion side so that the inner peripheral stepped surface is in contact with the stepped surface of the fixed magnetic pole. The solenoid is characterized by being held in a state.

  The invention according to claim 5 is the invention according to claim 4, wherein the movable magnetic pole has a hole formed on the fixed magnetic pole side, and the cylindrical shape of the fixed magnetic pole, the other permanent magnet, and the auxiliary magnetic pole. The portion is formed with a through hole in the central axis direction, and further, one end portion and a neighboring portion are formed as a fitting small diameter portion having a diameter smaller than that of the other portion, and the fitting small diameter portion is formed on the movable magnetic pole. By being press-fitted into the hole, it is provided integrally with the movable magnetic pole, and the portions other than the fitting small-diameter portion are the through-holes in the cylindrical portion of the fixed magnetic pole, the other permanent magnet, and the auxiliary magnetic pole. And a shaft that is slidably inserted into the stationary magnetic pole and supported by the fixed magnetic pole for sliding.

  The invention according to claim 6 is the invention according to claim 5, further comprising a winding drum portion formed in a substantially cylindrical shape, the coil being wound around the winding drum portion, and the winding drum. The bobbin in which a part or all of the fixed magnetic pole and the movable magnetic pole is arranged inside the part, and the inside of the cylindrical part of the end cap and the inside of the winding body part of the bobbin A solenoid provided with a winding bush for guiding sliding of the movable magnetic pole.

  According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the winding is further provided inside the through hole of the cylindrical portion of the auxiliary magnetic pole and guides the sliding of the shaft. A solenoid having a bush.

  According to the first aspect of the present invention, since the muffling member surrounding the permanent magnet is provided so as to protrude to the movable magnetic pole side from the permanent magnet, when the movable magnetic pole returns to the standby position, The movable magnetic pole collides only with the silencing member and does not collide with the permanent magnet, or the movable magnetic pole collides with the permanent magnet very lightly, so that the generation of noise can be reduced and the total length of the solenoid is increased. Alternatively, the volume of the entire solenoid does not increase.

  Since the permanent magnet is fitted into the recessed portion or the through hole of the end cap, it is possible to prevent the permanent magnet from deviating from a predetermined position initially provided by vibration generated during operation of the solenoid or external vibration.

  According to the third aspect of the present invention, since the silencer member is held by the region from the end of the cylindrical portion of the end cap to the predetermined position, the silencer member can be used while the solenoid is used for a long time. It is possible to prevent the occurrence of problems such as peeling from the end cap, obstructing the sliding of the movable magnetic pole, and reducing the effect of reducing noise.

  According to the invention described in claim 4, the movable magnetic pole, the auxiliary magnetic pole, and another permanent magnet are integrally held by pressing the movable magnetic pole, the auxiliary magnetic pole, and the other permanent magnet into the fixed magnetic pole holding member. The movable magnetic pole, the auxiliary magnetic pole, and another permanent magnet can be assembled accurately, and the occurrence of noise and malfunction caused by lack of assembly accuracy can be prevented.

  According to the fifth aspect of the present invention, since the sliding of the movable magnetic pole is supported by the fixed magnetic pole via the shaft, it is not necessary to provide a sleeve. As a result, it is not necessary to perform a design or an assembly procedure in consideration of providing the sleeve.

  According to the sixth aspect of the present invention, the movable magnetic pole can be stably slid by providing the winding bush. In addition, the wound bushing is easier to incorporate than the sleeve, so it does not significantly affect the design and assembly procedure.

  According to the seventh aspect of the present invention, by providing another winding bush, the shaft and the movable magnetic pole can be stably slid without shaking even in a solenoid having a considerably long shaft.

It is sectional drawing which shows the non-energized state of the solenoid which concerns on the 1st Embodiment of this invention. It is an expanded sectional view of the permanent magnet for waiting state maintenance in the non-energized state of the solenoid concerning a 1st embodiment of the present invention, and its peripheral part. It is sectional drawing which shows the electricity supply state of the solenoid which concerns on the 1st Embodiment of this invention. It is an expanded sectional view of the attracting state holding permanent magnet in the energized state of the solenoid according to the first embodiment of the present invention and its peripheral portion. It is a schematic cross section (1) which shows operation | movement of the solenoid which concerns on the 1st Embodiment of this invention. It is a schematic cross section (2) which shows operation | movement of the solenoid which concerns on the 1st Embodiment of this invention. It is a schematic cross section (3) which shows operation | movement of the solenoid which concerns on the 1st Embodiment of this invention. It is a schematic cross section (4) which shows operation | movement of the solenoid which concerns on the 1st Embodiment of this invention. It is a schematic cross section (5) which shows operation | movement of the solenoid which concerns on the 1st Embodiment of this invention. It is a figure (1) which shows the components of the solenoid which concerns on the 1st Embodiment of this invention, (a) is a top view of the permanent magnet for adsorption state holding | maintenance, (b) is sectional drawing of the permanent magnet for adsorption state holding | maintenance (C) is a top view of the standby state holding permanent magnet, (d) is a sectional view of the standby state holding permanent magnet. It is a figure (2) which shows the components of the solenoid concerning a 1st embodiment of the present invention, (a) is a top view of a fixed magnetic pole, (b) is a sectional view of a fixed magnetic pole, (c) is an auxiliary magnetic pole. Sectional drawing, (d) is a plan view of the auxiliary magnetic pole. It is a figure (3) which shows the components of the solenoid which concerns on the 1st Embodiment of this invention, (a) is a top view of a movable magnetic pole, (b) is sectional drawing of a movable magnetic pole, (c) is a cross section of a bobbin. FIG. 4D is a bottom view of the bobbin. It is a figure (3) which shows the components of the solenoid which concerns on the 1st Embodiment of this invention, (a) is a top view of an end cap, (b) is sectional drawing of an end cap, (c) is a plane of a shaft. FIG. 4D is a front view of the shaft. It is a figure (4) which shows the components of the solenoid which concerns on the 1st Embodiment of this invention, (a) is a top view of a fixed magnetic pole holding member, (b) is sectional drawing of a fixed magnetic pole holding member, (c) Is a plan view of the muffler washer, and (d) is a cross-sectional view of the muffler washer. It is a figure (5) which shows the components of the solenoid which concerns on the 1st Embodiment of this invention, (a) is a top view of a case, (b) is sectional drawing of a case. It is an expanded sectional view of the permanent magnet for standby state maintenance in the non-energized state of the solenoid concerning a 2nd embodiment of the present invention, and its peripheral part. It is the cross-sectional schematic of the solenoid which concerns on a prior art, (a) shows a retraction state and (b) shows an electricity supply state.

  First, the general outline of the solenoid according to the first embodiment of the present invention will be described. It is sectional drawing which shows the non-energized state of the solenoid which concerns on the 1st Embodiment of this invention. In FIG. 1, 10 is a solenoid, 11 is a permanent magnet for holding a standby state, 12 is a top surface, 15 is a permanent magnet for holding an attracted state, 20 is an end cap, 21 is a cylindrical portion, 22 is a bottom portion, and 23 is a bowl-shaped portion. , 30 is a fixed magnetic pole, 31 is a protruding portion, 32 is a first cylindrical portion, 35 is an inclined surface, 40 is an auxiliary magnetic pole, 42 is a large-diameter cylindrical portion, 43 is a bowl-shaped portion, 50 is a movable magnetic pole, 51 Is an inverted frustoconical recessed part, 55 is a shaft, 57 is a small fitting part, 60 is a bobbin, 62 is a first hook-like part, 64 is a second hook-like part, 65 is a third hook-like part, 70 is a fixed magnetic pole holding member, 71 is a first part, 72 is a second part, 73 is a third part, 80 is a case, 82 is a first deformation part, 83 is a second deformation part, 90 is A silencer washer, 95 is a first winding bush, 96 is a suction coil, 97 is a demagnetizing coil, and 98 is a second winding. It is a bush. Moreover, FIG. 3 is sectional drawing which shows the energization state of the solenoid which concerns on the 1st Embodiment of this invention. In FIG. 3, reference numeral 92 denotes an upper surface, and other reference numerals are the same as those in FIG.

  The solenoid 10 according to the first embodiment of the present invention is a two-way (bidirectional) self-holding type capable of self-holding the movable magnetic pole both when energized as shown in FIG. 3 and when not energized as shown in FIG. It is a linear solenoid. Accordingly, the solenoid 10 attracts and holds the movable magnetic poles in two states, ie, the standby state and the attracted state, so that the two permanent magnets of the standby state retaining permanent magnet 11 and the attracted state retaining permanent magnet 15 are provided. Provided. The movable magnetic pole may be held by itself only in the standby state by omitting the attracting state holding permanent magnet 15. The self-holding solenoid is used in various devices, but the solenoid of the present invention can also be applied to various devices, and the use is not particularly limited. Further, the solenoid 10 is configured on the assumption that a pressing force in a direction in which the movable magnetic pole 50 is separated from the fixed magnetic pole 30 is applied from the load device. Therefore, a spring for separating the movable magnetic pole 50 from the fixed magnetic pole 30 is not provided. However, when such a pressing force is not applied, a spring for causing the movable magnetic pole to be provided between the movable magnetic pole and the fixed magnetic pole is provided. That's fine.

  Further, the solenoid 10 has two coils, a suction coil 96 and a degaussing coil 97. In the attraction coil 96, the movable magnetic pole 50 is attracted to the fixed magnetic pole 30 and slides toward the fixed magnetic pole 30 due to the flow of magnetic flux generated when the coil is energized. When the movable magnetic pole 50 is attracted to the fixed magnetic pole 30, the energization to the suction coil 96 is stopped. After the energization of the attracting coil 96 is stopped, the attracted state is retained by the flow of magnetic flux generated by the magnetic field of the attracted state retaining permanent magnet 15. Further, when the demagnetizing coil 97 is energized, it generates a flow of magnetic flux in the direction opposite to that of the attracting coil 96, cancels the flow of magnetic flux generated by the attracting state holding permanent magnet 15, and the movable magnetic pole 50 is fixed. It is pulled away from the magnetic pole 30. When the circuit for controlling energization to the solenoid has a configuration that can change the energization direction of the coil, only one coil may be provided without providing two coils.

  Next, components that constitute the solenoid 10 according to the first embodiment will be described. FIG. 2 is an enlarged cross-sectional view of a standby state holding permanent magnet and its peripheral portion when the solenoid according to the first embodiment of the present invention is in a non-energized state. The reference numerals used in FIG. 2 are the same as those in FIG. FIG. 10 is a diagram (1) showing components of the solenoid according to the first embodiment of the present invention, in which (a) is a plan view of an attracting state holding permanent magnet, and (b) is an attracting state holding. (C) is a top view of a permanent magnet for standby state maintenance, (d) is a sectional view of a permanent magnet for standby state maintenance. In FIG. 10, 13 is a lower surface, 16 is an upper surface, 17 is a lower surface, 18 is an inner peripheral surface, and other reference numerals are the same as those in FIG. Further, FIG. 13 is a diagram (3) showing components of the solenoid according to the first embodiment of the present invention, (a) is a plan view of the end cap, (b) is a sectional view of the end cap, c) is a plan view of the shaft, and (d) is a front view of the shaft. In FIG. 13, 24 is a notch, 25 is a recessed portion, 26 is a first inner peripheral surface, 27 is a second inner peripheral surface, 28 is an inner bottom surface, 29 is an inclined surface, and 56 is a main body portion. Other reference numerals are the same as those in FIG. In addition, FIG. 15 is a diagram (5) showing components of the solenoid according to the first embodiment of the present invention, in which (a) is a plan view of the case and (b) is a sectional view of the case. FIG. 15 is a diagram (5) showing components of the solenoid according to the first embodiment of the present invention, in which (a) is a plan view of the case and (b) is a sectional view of the case. In FIG. 15, 81 is a main body part, 84 is an inner peripheral surface, 85 is a first step surface, 86 is a second step surface, 87 and 88 are inner peripheral surfaces, and other symbols are the same as those in FIG. Indicates.

  As shown in FIGS. 10C and 10D, the standby state holding permanent magnet 11 is formed in a disc shape, and a portion on the lower surface 13 side is fitted into a recessed portion of an end cap 20 described later. The Further, the upper surface 12 of the standby state holding permanent magnet 11 is opposed to be parallel to the tip surface of the movable magnetic pole 50. However, even when the tip surface of the movable magnetic pole 50 is closest, the upper surface 12 does not contact the tip surface. As shown in FIGS. 10A and 10B, the attracting state holding permanent magnet 15 is formed in an annular shape. As shown in FIG. 1, the lower surface 17 is in contact with the fixed magnetic pole 30, and the upper surface 16 is The auxiliary magnetic pole 40 is provided in contact with the upper surface 16. A shaft 55 is inserted through the inner peripheral surface 18 of the attracting state holding permanent magnet 15. Thus, when the attracting state holding permanent magnet 15 is interposed between the fixed magnetic pole 30 and the auxiliary magnetic pole 40, the energization of the attraction coil 96 is stopped when the movable magnetic pole 50 is attracted to the fixed magnetic pole 30. Thereafter, the movable magnetic pole 50 continues to be attracted to the fixed magnetic pole 30 with a certain level of force. The standby state holding permanent magnet 11 or the attracting state holding permanent magnet 15 may be formed in a cylindrical shape or a prismatic shape according to the internal structure of the solenoid or the required magnetic field strength.

  As shown in FIG. 1, a case 80, an end cap 20 that closes an end of the case 80 on the side where the movable magnetic pole 50 is arranged, and a fixed magnetic pole 30 of the case 80 are arranged on the outer periphery of the solenoid 10. And an auxiliary magnetic pole 40 that closes the end portion on the side where the contact is made. As shown in FIG. 15, the case 80 is formed in a cylindrical shape, and the first deformable portion 82 and the second deformable portion 83 are deformed in the assembly process. The inner peripheral surface 87 of the first deformable portion 82 and the inner peripheral surface 88 of the second deformable portion 83 are formed thinner than the main body portion 81 so that the inner diameter is larger than the inner peripheral surface 84 of the main body portion 81. It is easy to deform. Further, by forming the first deformable portion 82 and the second deformable portion 83 thin, the stepped surface 85 between the inner peripheral surface 84 and the inner peripheral surface 87 is set to the press-fitting depth when the auxiliary magnetic pole is press-fitted. Similarly, the step surface 86 between the inner peripheral surface 84 and the inner peripheral surface 88 is used for setting the press-fitting depth when the end cap 20 is press-fitted.

  As shown in FIGS. 1 and 13A and 13B, the end cap 20 includes a cylindrical portion 21, a bottom portion 22, and a flange portion 23. The cylindrical portion 21 is formed in a substantially cylindrical shape, and is formed so as to extend in the direction of the central axis of the movable magnetic pole 50. In addition, the cylindrical portion 21 also has a role of supporting the sliding of the movable magnetic pole 50. Further, the cylindrical portion 21 also has a role of holding the first winding bush 95 together with the bobbin 60. In addition, as shown in FIG. 2 and FIG. 13, the cylindrical portion 21 is formed from the end of the bottom 22 side in the central axis direction of the movable magnetic pole 50, that is, from the thickness of the silencer washer 90 from the inner surface on the bottom 22 side. The second inner peripheral surface 27, which is a region up to a slightly longer position, is formed to have a slightly larger inner diameter than the diameter of the silencer washer 90, and is slightly longer than the thickness of the silencer washer 90. The inner diameter of the first inner peripheral surface 26, which is a region from the distant position to the end on the flange-like portion 23 side, is formed to be smaller than the diameter of the silencer washer 90. As will be described later, since the silencing washer 90 is made of a flexible material, the silencing washer 90 is deformed and pushed from the opening on the side of the hook-shaped portion 23 to the second inner peripheral surface 27. Can be easily implemented. Further, the silencing washer 90 inserted at the second inner peripheral surface 27 has a larger diameter than the inner diameter of the first inner peripheral surface 26, so that it can be easily detached from the second inner peripheral surface 27. There is nothing to do.

  The length of the second inner peripheral surface 27 in the direction of the central axis of the movable magnetic pole 50 may be slightly shorter than the thickness of the silencing washer 90 as long as it is in a range equal to or substantially equal to the thickness of the silencing washer 90. Although it may be impossible to completely insert the muffler washer 90, it is preferable that the muffler washer 90 be slightly longer than the thickness of the muffler washer 90. For the same reason, the inner diameter of the second inner peripheral surface 27 may be slightly smaller than the diameter of the silencer washer 90 as long as the inner diameter of the second inner peripheral surface 27 is equal to or substantially equal to the thickness of the silencer washer 90. It can be said that a slightly larger diameter than 90 is preferable. The length of the second inner peripheral surface 27 in the central axis direction of the movable magnetic pole 50 is slightly shorter than the thickness of the sound deadening washer 90, or the inner diameter of the second inner peripheral surface 27 is smaller than that of the sound deadening washer 90. When the diameter is slightly smaller than the diameter of the thickness, it is preferable that the material of the muffler washer 90 is a highly flexible rubber.

  The bottom 22 of the end cap 20 has a function of closing the end of the cylindrical portion 21 opposite to the movable magnetic pole 50 and holding the standby state holding permanent magnet 11 at a predetermined position. That is, as shown in FIG. 13B, the recessed portion 25 corresponding to the diameter of the standby state holding permanent magnet 11 is formed on the inner bottom surface 28 side of the bottom portion 22, that is, on the side where the standby state holding permanent magnet 11 is provided. The portion on the lower surface 13 side of the standby state holding permanent magnet 11 is press-fitted. By this press-fitting, the standby state holding permanent magnet 11 is securely fitted to the bottom portion 22, and is thus fixed so as not to be separated by its own attractive force even when the movable magnetic pole 50 approaches. In addition, it is possible to prevent the standby state holding permanent magnet 11 from falling off due to external vibration or impact. Further, as shown in FIG. 13, the flange portion 23 of the end cap 20 extends in a circular shape from the end opposite to the side on which the bottom portion 22 of the cylindrical portion 21 is provided, and is cut out in a partial region. A portion 24 is formed to serve as a lead-out port for leading a lead wire (not shown). In addition, an annular inclined surface 29 is formed so that the second deformable portion 83 of the case 80 can be easily deformed and brought into contact as shown in FIG. As will be described later, when the inner diameter of the silencer washer 90 is equal to or substantially equal to the diameter of the standby state holding permanent magnet 11, the standby state holding permanent magnet is not formed without forming the recess 25. 11 may be attached to the inner bottom surface 28 side of the bottom portion 22 with an adhesive. However, from the viewpoint of securely holding the standby state holding permanent magnet 11, it is preferable to form the recessed portion 25. Further, in the case where the recessed portion 25 is not formed, a through hole in which a pin can be inserted into the bottom portion 22 and whose inner diameter is smaller than the diameter of the standby state holding permanent magnet 11 may be provided. By forming such a through hole, an adhesive is applied to the standby state holding permanent magnet 11 or the inner bottom surface 28 and the standby state holding permanent magnet 11 is pressed against the bottom portion 22 in the assembly process, and then the through hole is formed. The standby state holding permanent magnet 11 can be pushed up and peeled off by the pin inserted into the hole.

  FIG. 4 is an enlarged cross-sectional view of the attracting state holding permanent magnet and its peripheral portion in the energized state of the solenoid according to the first embodiment of the present invention. The reference numerals used in FIG. 4 are the same as those in FIG. FIG. 11 is a diagram (2) showing components of the solenoid according to the first embodiment of the present invention, where (a) is a plan view of the fixed magnetic pole, (b) is a cross-sectional view of the fixed magnetic pole, c) is a sectional view of the auxiliary magnetic pole, and (d) is a plan view of the auxiliary magnetic pole. In FIG. 11, 33 is a second cylindrical portion, 34 is a front end surface, 36 is a first stepped surface, 37 is a second stepped surface, 38 is a rear end surface, 39 is a through-hole, and 41 is a small-diameter cylindrical portion. , 44 is a front end surface, 45 is a small-diameter peripheral side surface, 46 is an inclined peripheral side surface, 47 is a large-diameter peripheral side surface, 48 is an inclined surface, 49 is a through hole, and the other symbols are the same as those in FIG. Further, FIG. 12 is a diagram (3) showing components of the solenoid according to the first embodiment of the present invention, (a) is a plan view of the movable magnetic pole, (b) is a sectional view of the movable magnetic pole, c) is a sectional view of the bobbin, and (d) is a bottom view of the bobbin. In FIG. 12, 52 is a cylindrical recessed part, 53 is a bottom face, 61 is a winding drum part, 63 is a notch part, 66 is an inner peripheral surface, and other symbols are the same as those in FIG. FIG. 14 is a diagram (4) showing components of the solenoid according to the first embodiment of the present invention, where (a) is a plan view of the fixed magnetic pole holding member, and (b) is a view of the fixed magnetic pole holding member. Sectional view, (c) is a plan view of the muffler washer, and (d) is a cross-sectional view of the muffler washer. In FIG. 14, 74 is a first inner peripheral surface, 75 is a second inner peripheral surface, 76 is a third inner peripheral surface, 77 is a step surface, 78 is a first inclined surface, and 79 is a second inclined surface. A surface, 91 is an inner peripheral surface, 93 is a lower surface, and other reference numerals are the same as those in FIG.

  As shown in FIGS. 11A and 11B, the fixed magnetic pole 30 is generally formed in a substantially cylindrical shape, and a protruding portion 31 formed in a substantially truncated cone shape is provided on the movable magnetic pole 50 side. The first columnar portion 32 and the second columnar portion 33 are provided in this order from the protruding portion 31 toward the attracting state holding permanent magnet 15. In order to suppress a sudden change in the attractive force (thrust force) when the suction coil 96 is energized, the protruding portion 31 has all the peripheral side surfaces as inclined surfaces 35 having the same inclination, and the portion surrounded by the inclined surface 35 is It is formed in a substantially truncated cone shape. When the projecting portion 31 attracts the movable magnetic pole 50, as shown in FIG. 4, the projecting portion 31 enters the inside of the inverted frustoconical recessed portion 51. Further, the first step surface 36 which is the boundary between the protruding portion 31 and the first cylindrical portion 32 abuts on the movable magnetic pole 50 and restricts the sliding of the movable magnetic pole 50 as shown in FIG. Note that the tip surface 34 of the protruding portion 31 is configured not to contact the movable magnetic pole 50 in order to prevent sticking of the movable magnetic pole 50 when attracted.

  The first cylindrical portion 32 and the second cylindrical portion 33 are formed in order to press fit the fixed magnetic pole holding member 70 to a predetermined depth. That is, the second step surface 37 that is a boundary between the first columnar portion 32 and the second columnar portion 33 is related to the first step 71 of the fixed magnetic pole holding member 70 and the second step surface 37. It is formed in order to prevent the fixed magnetic pole 30 from coming off by stopping. When the fixed magnetic pole 30 is press-fitted into the fixed magnetic pole holding member 70, the rear end surface 38 of the second cylindrical portion 33 is in contact with the lower surface 17 of the attracting state holding permanent magnet 15, as shown in FIG. . Furthermore, as shown in FIG. 11B, the fixed magnetic pole 30 is formed with a through hole 39 that penetrates the entire protrusion 31, the first cylindrical portion 32, and the second cylindrical portion 33. The through hole 39 is formed so as to be parallel to the central axis direction of the movable magnetic pole 50, and the shaft 55 is inserted therethrough as shown in FIG. 4, but is not in contact with the shaft 55.

  The auxiliary magnetic pole 40 functions as a lid that closes the opening of the case 80 on the first deforming portion 82 side, and also has a function as a constituent member of a fixed magnetic circuit like the fixed magnetic pole 30. Further, as shown in FIGS. 11C and 11D, the auxiliary magnetic pole 40 includes a columnar portion composed of a small-diameter columnar portion 41 and a large-diameter columnar portion 42 and a flange-shaped portion 43. The small-diameter cylindrical portion 41 and the large-diameter cylindrical portion 42 are both formed to enter the fixed magnetic pole holding member 70. As shown in FIG. 4, the tip surface 44 of the small-diameter cylindrical portion 41 is in contact with the upper surface 16 of the attracting state holding permanent magnet 15. The small diameter cylindrical portion 41 is formed to have a slightly smaller diameter than the large diameter cylindrical portion 42. Further, the diameter of the large-diameter cylindrical portion 42 is formed to be equal to the diameters of the attracting state holding permanent magnet 15 and the second cylindrical portion 33 of the fixed magnetic pole 30. Therefore, when the second cylindrical portion 33, the attracting state retaining permanent magnet 15 and the large-diameter cylindrical portion 42 are press-fitted into the fixed magnetic pole holding member 70, the second cylindrical portion 33 is retained. The central axes of the permanent magnet 15 and the large-diameter columnar portion 42 coincide with each other, and the shaft 55 can be smoothly slid.

  Further, the boundary between the small-diameter circumferential side surface 45 of the small-diameter cylindrical portion 41 and the large-diameter circumferential side surface 47 of the large-diameter cylindrical portion 42 is an inclined circumferential side surface 46 without using a stepped surface as formed by other parts. . As shown in FIG. 4, the inclined peripheral side surface 46 is formed by the inclined peripheral side surface 46 of the fixed magnetic pole holding member 70 when the small diameter cylindrical portion 41 and the large diameter cylindrical portion 42 are press-fitted into the fixed magnetic pole holding member 70. The third portion 73 is drawn in for the purpose of being smoothly press-fitted into the large-diameter cylindrical portion 42. The hook-shaped portion 43 is a portion that is press-fitted into the first deformable portion 82 of the case 80. Further, like the hook-like portion 23 of the end cap 20, the hook-like portion 43 forms an annular inclined surface 48 in order to facilitate the deformation and contact of the second deformation portion 82 of the case 80. doing. In addition, a through-hole 49 that penetrates the entire small-diameter cylindrical portion 41, large-diameter cylindrical portion 42, and bowl-shaped portion 43 is formed. The through hole 49 is formed so as to be parallel to the central axis direction of the movable magnetic pole 50, and a second winding bush 98 for guiding the sliding of the shaft 55 is provided as shown in FIG.

  As shown in FIGS. 12A and 12B, the movable magnetic pole 50 has a substantially cylindrical outer shape as a whole, and an inverted frustoconical concave portion 51 is formed on the portion facing the fixed magnetic pole 30. Is formed. The inverted frustoconical recessed portion 51 is a portion into which the protruding portion 31 of the fixed magnetic pole 30 enters, and has a shape in which the irregularities are substantially reversed from the protruding portion 31 formed in a substantially truncated cone shape. The shape of the recessed portion is not limited to the truncated cone shape, and may be formed in other shapes such as a stepped recessed portion according to the required characteristics of the solenoid 10. Further, as described above, the bottom surface 53 of the inverted frustoconical recessed portion 51 is not in contact with the tip surface 34 of the protruding portion 31 when the movable magnetic pole 50 is attracted to the fixed magnetic pole 30. Furthermore, a cylindrical recess 52 is formed in the center of the bottom surface 53. The cylindrical recess 52 is a hole into which the shaft 55 is fitted, and is drilled along the central axis of the movable magnetic pole 50.

  As shown in FIGS. 12C and 12D, the bobbin 60 is provided with a first hook-like portion 62 at the end of the cylindrical winding body 61 on the auxiliary magnetic pole 40 side. A second hook-like portion 64 and a third hook-like portion 65 are provided at the end portion on the end cap 20 side. The third hook 65 has a notch 63 for leading a lead wire (not shown) to the outside, but the second hook 64 also has a coil at a portion not shown. A slit for wiring the wire is formed. Further, as shown in FIGS. 1 and 2, a first winding bush 95 that guides the sliding of the movable magnetic pole 50 is provided in the vicinity of the end portion on the end cap 20 side of the inner peripheral surface 66 of the winding drum portion 61. The end cap 20 is provided across the first inner peripheral surface 26. The first winding bush 95 is, for example, sufficiently supported so that the shaft 55 slides without shaking by the through hole 39 of the fixed magnetic pole 30, or the shaft 55 is shaken by the second winding bush 98. In order to be guided so as to slide without any problem, the first cap may be provided only on the first inner peripheral surface 26 of the end cap 20 without straddling the inner peripheral surface 66. As shown in FIGS. 13C and 13D, the shaft 55 is formed to have a smaller diameter than the main body portion 56, and the lower side (base end side) is fitted into the cylindrical recessed portion 52 of the movable magnetic pole 50. It is formed as a fitting small diameter portion 57 to be joined. When the fitting small-diameter portion 57 is press-fitted into the cylindrical recess 52, the step surface between the outer peripheral surface of the main body portion 56 and the outer peripheral surface of the fitting small-diameter portion 57 is the press-fitting end position.

  As shown in FIGS. 14A and 14B, the fixed magnetic pole holding member 70 is formed in a substantially cylindrical shape as a whole, and the first portion 71 having the thickest thickness in order from the movable magnetic pole 50 side, A second portion 72 having a smaller thickness than the first portion 71 and a third portion 73 having the smallest thickness are provided. Further, the step due to the difference in thickness of the first portion 71, the second portion 72, and the third portion 73 is formed on the inner peripheral surface, and the outer peripheral surface is formed on one cylindrical surface. . As described above, the stepped surface 77 between the first inner peripheral surface 74 of the first portion 71 and the second inner peripheral surface 75 of the second portion 72 is the second step of the fixed magnetic pole 30 in the assembled state. The surface is in contact with the surface and has a role of locking the fixed magnetic pole 30. The boundary region between the second inner peripheral surface 75 of the second portion 72 and the third inner peripheral surface 76 of the third portion 73 is not formed as a step surface but as a first inclined surface 78 that is inclined. Yes. The first inclined surface 78 is formed for the purpose of smoothly injecting the large-diameter columnar portion 42 when the auxiliary magnetic pole 40 is press-fitted. Further, the second inclined surface 79 formed at the end of the third portion 73 on the side of the flange portion 43 of the auxiliary magnetic pole 40 press-fits the fixed magnetic pole 30, the attracting state holding permanent magnet 15 and the auxiliary magnetic pole 40. At this time, these are introduced for the purpose of smooth press-fitting.

  The silencer washer 90 protects the movable magnetic pole 50 by colliding with the movable magnetic pole 50 in place of the standby state holding permanent magnet 11, and has a role of reducing noise when the movable magnetic pole 50 collides. That is, as shown in FIGS. 14C and 14D, the whole is formed in an annular shape, and the upper surface 92 and the lower surface 93 are formed as flat surfaces. In addition, the standby state holding permanent magnet 11 is disposed in a space surrounded by the inner peripheral surface 91, but as shown in FIG. 2, the upper surface 92 is more movable than the upper surface 12 of the standby state holding permanent magnet 11. It protrudes toward the 50 side, that is, the upper side. Furthermore, the silencer washer 90 is formed of a flexible rubber or resin. Therefore, since the impact when the movable magnetic pole 50 collides with the upper surface 92 side is absorbed by the entire silencing washer 90, a relatively loud noise unlike when it collides with the permanent magnet is not generated. The silencing washer 90 is not completely formed in an annular shape and may be cut as long as it protects the movable magnetic pole 50 and can reduce noise at the time of collision of the movable magnetic pole 50. . The material of the sound deadening washer 90 is flexible and flexible enough to be inserted into the cylindrical portion 21 of the end cap 20, and has a certain degree of durability against an impact from the movable magnetic pole 50. If it has, it should just select suitably according to the use etc. of the solenoid 10. In order to further shorten the overall length of the solenoid 10, the upper surface 92 protrudes slightly toward the movable magnetic pole 50 from the upper surface 12 of the standby state holding permanent magnet 11, and the gap between the movable magnetic pole 50 and the upper surface 12 is reduced. Although it is possible to make the movable magnetic pole 50 collide with the standby state holding permanent magnet 11 very lightly, from the viewpoint of suppressing the generation of noise, the movable magnetic pole 50 has a standby state holding permanent magnet 11. It is desirable to have a configuration that does not collide with.

  Furthermore, the operation of the solenoid 10 according to the first embodiment will be described. FIG. 5 is a schematic cross-sectional view (1) showing the operation of the solenoid according to the first embodiment of the present invention. FIG. 6 is a schematic cross-sectional view (2) showing the operation of the solenoid according to the first embodiment of the present invention. FIG. 7 is a schematic cross-sectional view (3) showing the operation of the solenoid according to the first embodiment of the present invention. In addition, FIG. 8 is a schematic cross-sectional view (4) showing the operation of the solenoid according to the first embodiment of the present invention. FIG. 9 is a schematic cross-sectional view (5) showing the operation of the solenoid according to the first embodiment of the present invention. The reference numerals used in FIGS. 5 to 9 are the same as those in FIG. In addition, in FIG. 5 to FIG. 9, the description of hatching is omitted.

  First, the operation when the solenoid 10 is switched from the off state to the on state will be described. First, FIG. 1 shows a state in which neither the attraction coil 96 nor the degaussing coil 97 is energized and is completely off. The movable magnetic pole 50 is at a position farthest from the fixed magnetic pole 30, that is, in a standby state in contact with the silencing washer 90. In this state, when the suction coil 96 is energized, a magnetic field is generated. As shown in FIG. 5, the suction coil 96 has the movable magnetic pole 50, the fixed magnetic pole 30, the attracting state holding permanent magnet 15, the auxiliary magnetic pole 40, and the case. A magnetic circuit around 80 and the end cap 20 is formed. The magnetic flux flow of this magnetic circuit is set to a size that is necessary and sufficient for the movable magnetic pole 50 to be attracted to the fixed magnetic pole 30, and the movable magnetic pole 50 immediately slides toward the fixed magnetic pole 30. FIG. As shown in FIG. 4, the movable magnetic pole 50 is attracted to the fixed magnetic pole 30. When the movable magnetic pole 50 is attracted to the fixed magnetic pole 30, the energization of the suction coil 96 is stopped. By stopping energization, the suction coil 96 does not generate a magnetic field. However, the magnetic field generated by the attracting state holding permanent magnet 15 maintains the state where the movable magnetic pole 50 is attracted to the fixed magnetic pole 30 even when the energization of the attracting coil 96 is stopped as shown in FIG. The flow of magnetic flux can be continued. Therefore, the state where the shaft 55 protrudes from the auxiliary magnetic pole 40 is maintained.

  Next, the operation for switching the solenoid 10 from the on state to the off state will be described. In order to eliminate the state where the movable magnetic pole 50 is attracted to the fixed magnetic pole 30, the demagnetizing coil 97 is energized. When the demagnetizing coil 97 is energized, a flow of magnetic flux in a direction that cancels the magnetic field generated by the attracting state holding permanent magnet 15 is generated, and as shown in FIG. 8, the shaft 55 is caused by a repulsive force from a load device (not shown). Is pushed back. When the shaft 55 is pushed back, the movable magnetic pole 50 also slides from the fixed magnetic pole 30 toward the position farthest from the fixed magnetic pole 30. As shown in FIG. 9, the movable magnetic pole 50 and the shaft 55 stop when the movable magnetic pole 50 collides with the silencing washer 90, but the movable magnetic pole 50 does not collide with the standby state holding permanent magnet 11. Absent. Therefore, the collision with the standby state holding permanent magnet 11 does not generate noise, and the standby state holding permanent magnet 11 is not cracked or chipped due to the impact of the collision. Further, in this state, a magnetic circuit that goes around the standby state holding permanent magnet 11, the movable magnetic pole 50 and the end cap 20 is formed by the magnetic field generated by the standby state holding permanent magnet 11. Since the movable magnetic pole 50 continues to be held in the state of being attracted to the standby state holding permanent magnet 11, the movable magnetic pole 50 does not move from the standby position with a small vibration level, and this state is continued.

  As described above, in the solenoid 10 according to the first embodiment of the present invention, the silencing washer 90 that is the silencing member surrounding the standby state holding permanent magnet 11 is more than the standby state holding permanent magnet 11. Since it is provided so as to protrude to the movable magnetic pole 50 side, when the movable magnetic pole 50 returns to the standby position, the movable magnetic pole 50 collides only with the silencer washer 90 and does not collide with the standby state holding permanent magnet 11. It becomes a structure, generation | occurrence | production of noise can be reduced, and the full length of the solenoid 10 becomes long, or the volume of the whole solenoid does not become large. Further, since the standby state holding permanent magnet 11 is fitted into the recessed portion 25 of the end cap, the standby state holding permanent magnet 11 is initially provided by vibration generated during operation of the solenoid 10 or external vibration. It is possible to prevent deviation from the position. In addition, since the silencer washer 90 is held by the region from the end of the cylindrical portion 21 of the end cap 20 on the bottom 22 side to a predetermined position, the silencer washer 90 can be Occurrence of problems such as peeling from the cap 20, obstructing the sliding of the movable magnetic pole 50, and reducing the effect of reducing noise can be prevented. Further, the movable magnetic pole 50, the auxiliary magnetic pole 40, and the attracting state holding permanent magnet 15 are press-fitted into the fixed magnetic pole holding member 70, whereby the movable magnetic pole 50, the auxiliary magnetic pole 40, and the attracting state holding permanent magnet 15 are integrally held. Therefore, the movable magnetic pole 50, the auxiliary magnetic pole 40, and the attracting state holding permanent magnet 15 can be accurately assembled, and the noise caused by the lack of assembling accuracy, that is, the deviation or inclination of these central axes occurs. And occurrence of malfunctions can be prevented. In addition, since sliding of the movable magnetic pole 50 is supported by the fixed magnetic pole 30 via the shaft 55, it is not necessary to provide a sleeve. As a result, it is not necessary to perform a design or an assembly procedure in consideration of providing the sleeve. Further, by providing the first winding bush 95, the movable magnetic pole 50 can be stably slid. In addition, the wound bushing is easier to incorporate than the sleeve, so it does not significantly affect the design and assembly procedure. Furthermore, by providing the second winding bush 98, the shaft 55 and the movable magnetic pole 50 can be stably slid without shaking even in a solenoid having a considerably long shaft 55.

  Furthermore, a solenoid according to a second embodiment of the present invention will be described. FIG. 16 is an enlarged cross-sectional view of a standby state holding permanent magnet and its peripheral portion in a non-energized state of the solenoid according to the second embodiment of the present invention. In FIG. 16, 110 is a solenoid, 111 is a permanent magnet for holding a standby state, 112 is an upper surface, 113 is an upper portion, 114 is a lower portion, 120 is an end cap, 121 is a cylindrical portion, 122 is a bottom portion, 123 is a bowl-shaped portion, 129 is an opening. Reference numeral 160 denotes a bobbin, 150 denotes a movable magnetic pole, 183 denotes a second deforming portion, 190 denotes a silencer washer, 192 denotes an upper surface, and 195 denotes a first winding bush.

  The solenoid 110 according to the second embodiment of the present invention is provided with an opening 129 in the bottom 122 of the end cap 120 and a standby state holding permanent magnet 111 is fitted into the circular opening 129. There are features. The standby state holding permanent magnet 111 is formed such that the diameter of the columnar upper portion 113 is equal to the diameter of the opening 129, and the columnar lower portion 114 is formed to have a larger diameter than the upper portion 113. Further, similarly to the solenoid 10 according to the first embodiment of the present invention, the silencer washer 190 is provided so that the upper surface 192 protrudes from the upper surface 112 of the upper portion 113 to the movable magnetic pole 150 side. Further, the silencer washer 190 has a lower portion 114 bonded to the bottom portion 122. A configuration in which the first winding bush 195 is disposed so as to straddle the cylindrical portion 121 and the bobbin 160 of the end cap 120, and a configuration in which the hook-shaped portion 123 is fixed by the second deformation portion 183. The other components not shown in the figure are the same as those of the solenoid 10 according to the first embodiment of the present invention.

  According to the solenoid 110 according to the second embodiment described above, the volume of the standby state holding permanent magnet 111 is equivalent to that of the standby state holding permanent magnet 11 of the solenoid 10 according to the first embodiment of the present invention. Therefore, it is suitable when a larger attractive force is required for the movable magnetic pole 150. Even if a magnet made of an inexpensive material having a weaker magnetic force than the standby state holding permanent magnet 11 of the solenoid 10 according to the first embodiment is adopted as the standby state holding permanent magnet 111, the standby state holding permanent magnet. A magnetic force equivalent to 11 can be obtained. Further, since the diameter of the lower portion 114 of the standby state holding permanent magnet 111 is larger than the diameter of the opening 129 of the bottom portion 122, the standby state holding permanent magnet 111 is prevented from being displaced from a predetermined position initially provided by vibration or the like. In addition, it is possible to reliably prevent the standby state holding permanent magnet 111 from separating into the end cap 120.

  The present invention is not limited to the contents described above. For example, a frame-shaped yoke may be provided instead of the case, and the present invention may be applied to a swing type or rotary type solenoid instead of a direct acting type. Good. Thus, various modifications can be made without departing from the scope described in each claim.

10 Solenoid 11 Standing State Holding Permanent Magnet 12 Upper Surface 13 Lower Surface 15 Adsorption State Holding Permanent Magnet 16 Upper Surface 17 Lower Surface 18 Inner Perimeter Surface 20 End Cap 21 Cylindrical Part 22 Bottom 23 Gutter 24 Notch 25 Recess 26 1 inner peripheral surface 27 second inner peripheral surface 28 inner bottom surface 29 inclined surface 30 fixed magnetic pole 31 protruding portion 32 first cylindrical portion 33 second cylindrical portion 34 tip surface 35 inclined surface 36 first step surface 37 Second step surface 38 Rear end surface 39 Through hole 40 Auxiliary magnetic pole 41 Small-diameter cylindrical portion 42 Large-diameter cylindrical portion 43 Haze-shaped portion 44 Tip surface 45 Small-diameter peripheral side surface 46 Inclined peripheral side surface 47 Large-diameter peripheral side surface 48 Inclined surface 49 Through hole 50 Movable magnetic pole 51 Reverse frustoconical recessed portion 52 Cylindrical recessed portion 53 Bottom surface 55 Shaft 56 Main body portion 57 Small fitting portion 60 Bobbin 61 Winding body portion 62 First flange portion 63 Notch portion 64 Second hook-like portion 65 Third hook-like portion 66 Inner peripheral surface 70 Fixed magnetic pole holding member 71 First portion 72 Second portion 73 Third portion 74 First inner peripheral surface 75 Second inner periphery Surface 76 Third inner peripheral surface 77 Step surface 78 First inclined surface 79 Second inclined surface 80 Case 81 Main body portion 82 First deformation portion 83 Second deformation portion 84 Inner peripheral surface 85 First step surface 86 Second step surface 87 Inner peripheral surface 88 Inner peripheral surface 90 Silencing washer 91 Inner peripheral surface 92 Upper surface 93 Lower surface 95 First winding bush 96 Suction coil 97 Demagnetizing coil 98 Second winding bush 110 Solenoid 111 Standby State-maintaining permanent magnet 112 Upper surface 113 Upper portion 114 Lower portion 120 End cap 121 Cylindrical portion 122 Bottom portion 123 Gutter portion 129 Opening portion 150 Movable magnetic pole 160 Bobbin 183 Second deforming portion 190 Silencing washer 192 Surface 195 first winding bush 201 solenoid 202 coil 203 movable pole 204 stopper 205 yoke 206 permanent magnet 207 spring

Claims (4)

A case formed in a substantially cylindrical shape and provided with a first opening and a second opening;
A coil provided inside the case;
A fixed magnetic pole formed in a substantially cylindrical shape and provided in the vicinity of the second opening inside the case;
When the coil is energized, it is attracted to the fixed magnetic pole, slides from the standby position farthest from the fixed magnetic pole to the fixed magnetic pole side, and is separated from the fixed magnetic pole when the coil is de-energized. A movable magnetic pole provided to return to the standby position;
An end cap provided to close the first opening of the case;
A permanent magnet that is provided inside the end cap so as to face the end of the movable magnetic pole, and that attracts the movable magnetic pole and holds the movable magnetic pole in the standby position when the movable magnetic pole is in the standby position. When,
A flexible silencing member is provided on an inner surface of the end cap, and surrounds the permanent magnet and is provided so as to protrude toward the movable magnetic pole side with respect to the permanent magnet. solenoid. The end cap is formed with a recess or a through hole at a portion facing the end of the movable magnetic pole,
The solenoid according to claim 1, wherein the permanent magnet is fitted into the recessed portion or the through hole of the end cap. The end cap is formed in a substantially cylindrical shape so as to extend in the central axis direction of the movable magnetic pole, and the cylindrical portion in which the movable magnetic pole is slidable inside, and the cylindrical portion Provided at the end of the case side and fixed to the first opening of the case, and at the end of the cylindrical portion opposite to the case side of the cylindrical portion. The cylindrical portion is provided so as to close an end portion and includes a bottom portion in which the recessed portion or the through hole is formed, and the cylindrical portion extends from the end portion on the bottom portion side in the central axis direction of the movable magnetic pole. An inner diameter of a region up to a predetermined position separated by a length equal to or substantially equal to the thickness is formed to be a predetermined inner diameter equal to or substantially equal to the diameter of the muffler member, and The inner diameter is greater than the diameter of the muffler member It is formed to be smaller,
The sound deadening member is held in the region from the end of the cylindrical portion on the bottom side to the predetermined position separated by a length equal to or substantially equal to the thickness of the sound deadening member. 2. The solenoid according to 2. Furthermore, a winding drum portion formed in a substantially cylindrical shape is provided, and the coil is wound around the winding drum portion, and a part or all of the fixed magnetic pole and the movable magnetic pole are arranged inside the winding drum portion. With the bobbin being
It is provided inside the cylindrical portion of the end cap, or straddling the inside of the cylindrical portion of the end cap and the inside of the winding drum portion of the bobbin, and sliding the movable magnetic pole. The solenoid according to claim 3 , further comprising a winding bush for guiding movement.

Images