JP2013247172A - Solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid having a structure capable of maintaining reliability without deforming component parts even when a stress is added to a shaft from a direction orthogonal to the central axis.SOLUTION: A shaft 25 is removable with a movable magnetic pole 20, namely, the shaft 25 is provided to be separated from the movable magnetic pole 20, and further a spring 41 slides the shaft 25 on a side of the movable magnetic pole 20 when energization to a coil 48 is stopped, and furthermore the shaft 25 slides the movable magnetic pole to a position before the energization, namely, a position where an O ring 45 contacts to an end cap 44. Therefore, a stress to be inclined to the central axis is not added to the movable magnetic pole 20 even when the stress in a direction orthogonal to the central axis is added to the shaft 25 from a pressing member 62. Accordingly, reliability of a solenoid 10 can be maintained without deforming component parts of the solenoid.

Description

  The present invention relates to a solenoid, and more particularly to a solenoid suitable for use in a locking mechanism.

  Solenoids are often used in locking mechanisms for vehicles, buildings, machine tools, and the like because of the high operating speed and the certainty of position retention after the operation.

  Below, the prior art of a solenoid having a long stroke and suitable for being incorporated in a lock mechanism will be described. FIG. 10 is a cross-sectional view showing the structure of a solenoid according to the prior art. 10, 70 is a solenoid, 71 is a movable magnetic pole, 72 is a main body, 73 is a tip, 74 is a shaft, 75 is a fixed magnetic pole, 76 is a support member, 77 is a case, 78 is a coil, 79 is a bobbin, 80 Is a bearing, and 81 is a sleeve.

  FIG. 10 shows a solenoid disclosed in Japanese Patent Laid-Open No. 2006-303090. The solenoid 70 according to the prior art includes a coil 78 wound around a bobbin 79 inside a case 77, a fixed magnetic pole 75 disposed inside the coil 78, and a movable magnetic pole 71 in an insertion hole of the fixed magnetic pole 75. Yes. The movable magnetic pole 71 is provided with a main end portion 72 and a tip end portion 73, and the tip end portion 73 has a frustoconical inclined surface on the peripheral side, and a hole for fitting the shaft 74 is opened on the tip end surface. ing. The shaft 74 is configured to be supported by a bearing 80 provided in the insertion hole of the support member 76. In addition, before energizing the coil 78, the inclination angle of the peripheral side surface of the tip 73 and the corresponding inverted frustoconical concave surface of the fixed magnetic pole 75 is reduced with respect to the central axis of the movable magnetic pole 71. The gap between the peripheral side surface of the movable magnetic pole 71 and the concave surface of the fixed magnetic pole 75 is increased. When the coil 78 is energized, the movable magnetic pole 71 slides inside the sleeve 81 and the shaft 74 protrudes forward.

  According to the above configuration, the solenoid 70 has a small inclination angle between the peripheral side surface of the movable magnetic pole 71 and the concave surface of the fixed magnetic pole 75 before the coil 78 is energized. It becomes possible to lengthen the stroke. As a result, when the coil 78 is energized, the shaft 74 protrudes greatly, which makes it very suitable for use in a locking mechanism.

  By the way, in a lock mechanism incorporating a solenoid, in order to prevent the shaft from being retracted into the case due to the influence of a power failure or the like to be unlocked, the shaft is pressed by pushing the shaft from a direction perpendicular to the central axis of the shaft, for example. In many cases, the movement is restricted. In the configuration of FIG. 10, when a stress is applied to the shaft 74 from a direction orthogonal to the central axis, a stress that is inclined with respect to the central axis is applied to the movable magnetic pole 71 that is integral with the shaft 74. If it does so, it will be in the state where the movable magnetic pole 71 was strongly pressed on the sleeve 81, and the deformation | transformation of the sleeve 81 and the deformation | transformation of the connection part of the movable magnetic pole 71 and the shaft 74 will be caused, and the reliability of a solenoid will be reduced.

JP 2006-303090 A

  In order to solve the above problems, the present invention provides a solenoid having a structure capable of maintaining reliability without deformation of components even when stress is applied to the shaft from a direction orthogonal to the central axis. Objective.

  According to the first aspect of the present invention, there is provided a movable magnetic pole slidably provided, a shaft having a base end portion disposed so as to be able to contact and separate from a distal end portion of the movable magnetic pole, and a through hole formed therein. A shaft support material that slidably supports the shaft by a hole, a coil disposed in the vicinity of the movable magnetic pole, an insertion hole through which the shaft is inserted, and the movable magnetic pole when the coil is energized In a solenoid having a fixed magnetic pole that attracts the shaft and a spring provided so as to constantly bias the shaft toward the movable magnetic pole, when the coil is energized, the movable magnetic pole presses the shaft. The shaft is stopped when the predetermined portion comes into contact with the shaft support material, the movable magnetic pole is stopped before being attracted to the fixed magnetic pole, and the energization to the coil is stopped. In addition, the spring is a solenoid that slides the shaft toward the movable magnetic pole, and the shaft slides the movable magnetic pole to a position before energization of the coil. is there.

  According to a second aspect of the present invention, in the first aspect of the present invention, the shaft is formed such that the diameter of the tip portion is smaller than the diameter of the intermediate portion, and between the tip portion and the intermediate portion. The step portion is a predetermined portion.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the shaft is formed such that a diameter of the base end portion is smaller than a diameter of the intermediate portion, and the base end A solenoid having a spring receiver for receiving one end of the spring in a region closest to the intermediate portion of the portion.

  The invention according to claim 4 is the solenoid according to claim 3, wherein the spring receiver is an E-ring.

  According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, the shaft support member has a spring receiving surface that receives the other end of the spring formed around the through hole. It is the solenoid characterized by this.

  According to a sixth aspect of the invention, in the invention according to any one of the third to fifth aspects of the invention, when the shaft stops energization of the coil, the spring receiver is fixed to the fixed magnetic pole. The solenoid is characterized in that sliding by the urging force of the spring is stopped by abutting the spring.

  According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, the fixed magnetic pole and the shaft support member are formed with cylindrical portions that face each other. The solenoid is characterized in that either one of the cylindrical portions is fitted inside the other cylindrical portion.

  The invention according to claim 8 is the invention according to claim 7, wherein the tubular portion of the fixed magnetic pole and the tubular portion of the shaft support member accommodate the spring between the shaft. In addition, the solenoid is formed so as to form a gap having a predetermined width in order to store the grease adhering to the shaft.

  The invention according to claim 9 is the invention according to claim 7 or claim 8, wherein the shaft support member has a diameter on the side where the cylindrical portion is formed larger than the diameter on the opposite side. A step member is formed, and a flange member fitted to be in contact with the step portion of the shaft support member on the opposite side of the shaft support member from the side where the cylindrical portion is formed, and a substantially cylinder A solenoid having a shape and a case in which the cylindrical portion of the shaft support member is fitted in a hollow portion and an end portion is provided so as to abut against the flange member. It is.

  The invention according to a tenth aspect is the invention according to the ninth aspect, wherein the hollow portion of the case is further fitted on the opposite side to the side on which the cylindrical portion of the shaft support member is fitted. An end cap and a buffer provided at the base end of the movable magnetic pole and adapted to abut against the end cap before the spring receiver abuts against the fixed magnetic pole when energization of the coil is stopped. And a solenoid.

  According to the first aspect of the present invention, the shaft can be brought into and out of contact with the movable magnetic pole, that is, the shaft is provided in a state separated from the movable magnetic pole, and in addition to this, when energization to the coil is stopped In addition, since the spring slides the shaft toward the movable magnetic pole and the shaft slides the movable magnetic pole to the position before energization, even if stress is applied to the shaft from the direction perpendicular to the central axis. The movable magnetic pole is not subjected to stress that is inclined with respect to the central axis. Therefore, the reliability of the solenoid can be maintained without deforming the components of the solenoid.

  According to the second aspect of the present invention, since the sliding of the shaft is stopped by the step portion between the tip portion and the intermediate portion, even if the shaft and the movable magnetic pole are separated, the movable magnetic pole is not The shaft can be accurately slid by a predetermined stroke length so as to stop before being attracted to the fixed magnetic pole.

  According to the third aspect of the present invention, since the spring receiver is provided between the stepped portion and the base end portion of the shaft, the movable magnetic pole and the shaft after the energization of the coil is stopped even in the configuration in which the shaft is separated from the movable magnetic pole. Can be immediately and simultaneously returned to the position before energization.

  According to the invention described in claim 4, since the spring receiver is an E-ring, the spring receiver can be easily provided accurately at a predetermined position on the peripheral side surface of the shaft.

  According to the fifth aspect of the present invention, since the spring support surface is formed on the shaft support member, it is not necessary to provide a second spring support.

  According to the sixth aspect of the present invention, when the energization to the coil is stopped, the sliding of the movable magnetic pole and the shaft is stopped by the spring receiver coming into contact with the fixed magnetic pole. There is no need to provide a separate means.

  According to the invention described in claim 7, since the cylindrical portions of the fixed magnetic pole and the shaft support member are fitted to each other, it is possible to easily realize accurately setting the stroke of the shaft to a predetermined length, A solenoid with little variation in stroke length can be manufactured.

  According to the eighth aspect of the invention, since the gap for storing the grease attached to the shaft is formed, it is possible to prevent the grease from penetrating to the periphery of the movable magnetic pole and preventing the movable magnetic pole from sliding.

  According to the ninth aspect of the present invention, the shaft support member is fitted to the case so that the case and the flange member abut after the flange member is fitted to the stepped portion of the shaft support member. Therefore, these parts can be accurately fitted to each other, and a highly reliable solenoid can be manufactured.

  According to the tenth aspect of the present invention, it is possible to reduce the impact sound when the movable magnetic pole and the shaft return to their original positions by the end cap and the cushioning material.

It is sectional drawing which shows the solenoid which concerns on the 1st Embodiment of this invention, (a) shows an energized state and (b) shows a non-energized state. It is a figure which shows the solenoid which concerns on the 1st Embodiment of this invention, (c) is a right side surface, (b) is a front view. It is a partial expanded sectional view of the shaft vicinity of the solenoid which concerns on the 1st Embodiment of this invention. It is a partial expanded sectional view (1) which shows the use condition of the solenoid which concerns on the 1st Embodiment of this invention. It is a partial expanded sectional view (2) which shows the use condition of the solenoid which concerns on the 1st Embodiment of this invention. It is a partial expanded sectional view (3) which shows the use condition of the solenoid which concerns on the 1st Embodiment of this invention. It is a partial expanded sectional view which shows the state which grease stored inside the solenoid which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the solenoid which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the solenoid which concerns on the 3rd Embodiment of this invention. It is sectional drawing which shows the structure of the solenoid which concerns on a prior art.

  First, the configuration of the solenoid according to the first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing a solenoid according to a first embodiment of the present invention, where (a) shows an energized state and (b) shows a non-energized state. In FIG. 1, 10 is a solenoid, 20 is a movable magnetic pole, 21 is a main body, 22 is an annular portion, 23 is a recessed portion, 24 is a tip, 24a is an inclined surface, 24b is a tip, 25 is a shaft, and 26 is a base. End portion, 26a is a proximal end surface, 27 is an annular groove, 28 is an intermediate portion, 29 is a distal end portion, 30 is a shaft support member, 31 is a cylindrical portion, 32 is a proximal end portion, 33 is a distal end portion, 33a is a through hole , 33b is a spring receiving surface, 34 is a fixed magnetic pole, 34a is an insertion hole, 35 is an opposing portion, 35a is an inclined surface, 36 is a small diameter intermediate portion, 37 is a large diameter intermediate portion, 38 is a main body portion, and 39 is a cylindrical portion. , 40 is an E-ring, 41 is a spring, 42 is a case, 43 is a thin part, 44 is an end cap, 45 is an O-ring, 46 is a clamping member, 47 is a bobbin, 48 is a coil, 49 is a sleeve, 50 is a collar Members, 51 and 52 are openings, and 55 is a storage space. The scan is. 2A and 2B are diagrams showing the solenoid according to the first embodiment of the present invention, where FIG. 2C is a right side surface, and FIG. 2B is a front view. In FIG. 2, reference numerals 53 and 54 denote openings, and other reference numerals are the same as those in FIG.

  As shown in FIG. 1, the solenoid 10 according to the first embodiment of the present invention is relatively long in the central axis direction of the movable magnetic pole 20 and the shaft 25, and generally requires a long stroke. The configuration is suitable for the locking mechanism. Further, the internal mechanism is completely covered with the shaft support member 30, the case 42, and the end cap 44, so that intrusion of dust and rainwater can be prevented. In addition, the solenoid 10 slides the movable magnetic pole 20 through the fact that the shaft 25 abuts against the shaft support member 30 and the sliding thereof is restricted and the sliding of the shaft 25 is restricted, as will be described later. Is regulated. That is, the solenoid 10 according to this embodiment does not employ a configuration that restricts the sliding of the shaft through restricting the sliding of the movable magnetic pole, unlike a general solenoid. Further, each component will be described in detail.

  The movable magnetic pole 20 has an annular portion 22 formed at the base end portion of a substantially cylindrical body portion 21 and a distal end portion 24 formed in a substantially truncated cone shape. The main body 21 is formed longer than other types of solenoids in consideration of the length of the stroke, and is slidable inside the sleeve 49. Furthermore, in order to prevent the tip portion 24 from colliding with the facing portion 35 of the fixed magnetic pole 34 when the coil 48 is energized, the tip portion 24 fits into the facing portion 35 and does not return to the original position. The inclined surface 24a of the tip portion 24 and the inclined surface 35a of the facing portion 35 are formed in such a length that they do not contact each other. Further, the recessed portion 23 surrounded by the annular portion 22 becomes a space for providing an O-ring 45 serving as a cushioning material.

  FIG. 3 is a partially enlarged sectional view of the vicinity of the shaft of the solenoid according to the first embodiment of the present invention. In FIG. 3, reference numeral 33b denotes a spring receiving surface, and other reference numerals are the same as those in FIG.

  The shaft 25 is composed of a proximal end portion 26 on the proximal end side, a distal end portion 29 on the distal end side, and an intermediate portion 28 that is located between these and has a larger diameter. In addition, an annular groove 27 is formed in a region closest to the intermediate portion 28 on the peripheral side surface of the base end portion 26. The base end portion 26 is disposed in a state of being inserted into the insertion hole 34a of the fixed magnetic pole 34, but does not contact the inner peripheral surface of the insertion hole 34a. The base end face 26a of the base end portion 26 is always in contact with the front end face 24b of the movable magnetic pole 20 as described above. However, it is very easy for the shaft 25 to separate the base end surface 26a and the front end surface 24b by mechanically pulling the front end portion 29. An annular groove 27 formed in the base end portion 26 is a groove for attaching an E-ring 40 serving as a spring receiver. The annular groove 27 is formed in a region of the base end portion 26 closest to the intermediate portion 28 so that the E-ring 40 is in contact with the intermediate portion 28. In the solenoid 10, a through hole is formed in the shaft 25, and a pin is fitted here to form a spring receiver. Instead, an E-ring is used, so that a spring receiver can be provided very simply. The rigidity is not lowered by forming the through hole. When the energization of the coil 48 is stopped, the E-ring 40 is pressed against the fixed magnetic pole 34 by the elastic force of the spring 41. However, as shown in FIG. 1B, the intermediate portion 28 is in contact with the E-ring 40. As a result, the E-ring 40 is sandwiched between the fixed magnetic pole 34 and the intermediate portion 28. Therefore, the E-ring 40 is not detached from the annular groove 27 or deformed by being pressed against the fixed magnetic pole 34.

  The distal end portion 29 is a portion that slides while being supported by the through hole 33a of the shaft support member 30 that is a bearing, and is also a portion that protrudes from the through hole 33a and functions as a latch bolt or the like. Furthermore, as will be described later, it is also a portion to which a pressing force is applied from a direction orthogonal to the central axis of the shaft 25. Further, when the energization to the coil 48 is stopped, the portion protruding by the elastic force of the spring 41 is retracted into the through hole 33a. Further, grease is applied to the tip portion 29 so as to reduce friction with the through hole 33a. In addition, the grease applied to the tip portion 29 also serves to prevent the entry of dust and rainwater from the slight gap between the tip portion 29 and the through hole 33a. Further, the stepped portion between the intermediate portion 28 and the tip portion 29 regulates the sliding of the shaft 25 by abutting against the spring receiving surface 33b of the shaft support member 30 when the coil 48 is energized. Regulates sliding. When the sliding of the movable magnetic pole attracted by the fixed magnetic pole is restricted by a pin or E-ring, the pin or E-ring may be deformed during long-term use. It does not happen and can improve the reliability of the solenoid. When the diameter of the shaft 25 is sufficiently large, the base end portion 26 and the intermediate portion 28 are formed to have the same diameter, a through hole is formed in the base end portion 26, and a pin is fitted therein to spring. It may be received.

  The shaft support member 30 is opposed to the fixed magnetic pole 34 and is fitted to the fixed magnetic pole 34. The base portion 32 is formed continuously with the cylindrical portion 31 and fitted to the case 42. It consists of the front-end | tip part 33 which protrudes toward the exterior from the case 42 and the collar member 50, and becomes a bearing of the shaft 25. The tubular portion 31 is a portion into which the tubular portion 39 of the fixed magnetic pole 34 is fitted, and is formed in a relatively thick and substantially cylindrical shape so as to firmly support the shaft 25. Further, by adopting a configuration in which the tubular portion 39 is fitted to the tubular portion 31, it is possible to withstand the impact from the outside and the impact when the sliding of the shaft 25 is restricted. Further, when the solenoid 10 is assembled, the distance between the spring receiving surface 33b of the shaft support member 30 and the inclined surface 35a of the fixed magnetic pole 34 can be set accurately. Therefore, when the stepped portion between the intermediate portion 28 and the tip portion 29 comes into contact with the spring receiving surface 33b, as shown in the enlarged view at the bottom of FIG. 3, there is a slight difference between the inclined surface 24a and the inclined surface 35a of the movable magnetic pole 20. The sliding of the movable magnetic pole 20 can be stopped in a state in which a large gap is left, that is, immediately before the movable magnetic pole 20 is attracted to the fixed magnetic pole 34. The cylindrical portion 31 is also a portion that is fitted to the case 42 together with the base end portion 32.

  The base end portion 32 is a portion that fits into the case 42 and is formed in a substantially cylindrical shape that continues from the tubular portion 31. Further, it is formed thicker than the cylindrical portion 31 and supports the shaft 25 against stress applied to the tip portion 29 of the shaft 25 and the like. The tip 33 forms an outer shell of the solenoid 10 together with the case 42. A through hole 33 a is formed at the center of the tip portion 33 along the central axis of the shaft 25. Since the solenoid 10 has only one bearing, the tip 33 is formed with a length and a diameter sufficient to support the tip 29 of the shaft 25 against a stress applied from the outside. In addition, a spring receiving surface 33b is formed around the through hole 33a on the fixed magnetic pole 34 side of the tip portion 33. The spring receiving surface 33 b is a flat surface orthogonal to the central axis of the shaft 25 and functions as a spring receiver for the spring 41. Furthermore, it also has a role as a stopper that regulates the sliding of the shaft 25 by contacting the stepped portion between the intermediate portion 28 and the tip portion 29.

  The fixed magnetic pole 34 is connected to a substantially cylindrical facing portion 35 that faces the tip 24 of the movable magnetic pole 20, a substantially cylindrical small-diameter intermediate portion 36 that is formed continuously with the facing portion 35, and a small-diameter intermediate portion 36. The large-diameter intermediate portion 37 formed substantially continuously with the large-diameter intermediate portion 37 and the large-diameter intermediate portion 37 having a slightly larger diameter than the small-diameter intermediate portion 36 and slightly larger in diameter than the large-diameter intermediate portion 37. The main body portion 38 is formed in a large thickness, and the cylindrical portion 39 is formed continuously with the main body portion 38 and faces the cylindrical portion 31 of the shaft support member 30. As described above, the facing portion 35 is opposed to the distal end portion 24 of the movable magnetic pole 20, and is formed as an inclined surface 35 a whose inner peripheral surface is inclined at the same angle as the inclined surface 24 a of the movable magnetic pole 20. Further, since the facing portion 35 is fitted into the sleeve 49, the outer peripheral surface is in pressure contact with the sleeve 49. The small diameter intermediate portion 36 is fitted to the sleeve 49. The large diameter intermediate portion 37 is inserted into a bobbin 47 having an inner diameter slightly larger than that of the sleeve 49. Further, the step portion between the small diameter intermediate portion 36 and the large diameter intermediate portion 37 is a stop point when the small diameter intermediate portion 36 is press-fitted into the sleeve 49. The main body portion 38 is fitted into the case 42, and an insertion hole 34a for inserting the proximal end portion 26 of the shaft 25 is formed at the center. The shaft 25 and the insertion hole 34a are not in contact with each other, and the insertion hole 34a does not function as a bearing. The tubular portion 39 is fitted to the tubular portion 39 of the shaft support member 30 as described above.

  Returning to FIG. 1 and FIG. In the case 42, the distal end portion 33 of the shaft support member 30 is fitted on the distal end side, a thin portion 43 is formed on the proximal end side, and a holding member 46 and an end cap 44 are formed on the thin portion 43. The O-ring 45 is provided in the annular portion 22 of the movable magnetic pole 20. Further, the O-ring 45 is provided so as to contact the end cap 44 before the E-ring 40 contacts the fixed magnetic pole 34 when energization of the coil 48 is stopped. The sound is reduced. The holding member 46 holds the bobbin 47 around which the coil 48 is wound together with the main body portion 38 of the fixed magnetic pole 34. The eaves member 50 is a substantially disk-shaped fixing member for fixing to a device to be mounted, and as shown in FIG. 2D, openings 51, 52, 53, and 54 for screwing are formed. . In this embodiment, first, the flange member 50 is press-fitted so as to contact the stepped portion between the base end portion 32 and the distal end portion 33 of the shaft support member 30, and then the case 42 and the flange member 50 abut. Thus, the shaft support member 30 is press-fitted into the case 42. Therefore, the shaft support member 30 and the fixed magnetic pole 34 can be accurately fitted to the case 42, and a highly reliable solenoid can be manufactured.

  Next, an example of a usage state of the solenoid according to the first embodiment of the present invention will be described. FIG. 4 is a partially enlarged cross-sectional view (1) showing a use state of the solenoid according to the first embodiment of the present invention. In FIG. 4, 60 is a lock plate material, 61 is an opening, 62 is a pressing member, and other symbols are the same as those in FIG. FIG. 5 is a partially enlarged cross-sectional view (2) showing a use state of the solenoid according to the first embodiment of the present invention. Reference numerals used in FIG. 5 are the same as those in FIG. FIG. 6 is a partially enlarged cross-sectional view (3) showing a use state of the solenoid according to the first embodiment of the present invention. The reference numerals used in FIG. 6 are the same as those in FIG.

  When the solenoid 10 is used, the lock plate member 60 is brought into contact with the proximal end portion 32 of the shaft support member 30 as shown in FIG. And the front-end | tip part 29 of the shaft 25 is inserted in the opening part 61 of the lock plate material 60, and the slide to the direction orthogonal to the center axis | shaft of the shaft 25 of the lock plate material 60 is controlled. As a result, the lock plate 60 is locked. Further, the tip portion 29 of the shaft 25 is strongly pressed by the pressing member 62 from the side, that is, from the direction orthogonal to the central axis of the shaft 25. As a result, the shaft 25 is locked this time, so that the lock is not released even if the power to the coil 48 is stopped due to an operation error or the like. On the other hand, a strong stress is applied to the shaft 25 from the pressing member 62, but the shaft 25 and the movable magnetic pole 20 are only in contact with each other, and thus the movable magnetic pole 20 or the sleeve 49 is not affected by this stress. Further, since there is a gap between the base end portion 26 of the shaft 25 and the main body portion 38 of the fixed magnetic pole 34, this stress does not affect the fixed magnetic pole 34.

  When releasing the lock, as shown in FIG. 5, the pressing member 62 is separated from the distal end portion 29 of the shaft 25 to release the lock on the shaft 25. Further, as shown in FIG. 6, the energization to the coil 48 is stopped, and the tip portion 29 of the shaft 25 is retracted into the through hole 33 a of the shaft support member 30. As a result, the lock plate member 60 can be freely slid and the lock is completely released.

  FIG. 7 is a partially enlarged cross-sectional view showing a state where grease is stored in the solenoid according to the first embodiment of the present invention. In FIG. 7, 63 is grease, and other reference numerals are the same as those in FIG.

  Some solenoids used in the lock mechanism require grease to be applied to the shaft depending on the type of equipment to be mounted. If grease is applied to the shaft, the grease applied to the shaft is pushed in by the edge of the opening such as a lid and stored on the base end side of the shaft over a long period of use. In some cases, the accumulated grease may enter the gap between the movable magnetic pole and the fixed magnetic pole to prevent sliding of the movable magnetic pole. In the solenoid 10 according to this embodiment, as shown in FIG. 7, the storage space 55 exceeds the volume required to store the E-ring 40 and the spring 41, and the volume is taken into consideration for storing grease. In other words, since a gap having sufficient width for grease storage is provided around the E-ring 40 and the spring 41, a large amount can be stored on the peripheral side surface of the shaft 25 as indicated by the grease 63, and fixed to the movable magnetic pole 20 and fixed. It is possible to prevent the gap from entering the magnetic pole 34.

  As described above, according to the solenoid 10 according to the first embodiment of the present invention, the shaft 25 can be brought into and out of contact with the movable magnetic pole 20, that is, the shaft 25 is provided in a state separated from the movable magnetic pole 20. In addition to this, when the energization to the coil 48 is stopped, the spring 41 slides the shaft 25 toward the movable magnetic pole 20 side, and further, the shaft 25 positions the movable magnetic pole 20 before the energization, that is, the O-ring 45. Is slid until it comes into contact with the end cap 44, so that even when stress is applied from the pressing member 62 to the shaft 25 in a direction perpendicular to the central axis, the movable magnetic pole 20 is moved relative to the central axis. Stress is not applied. Therefore, the reliability of the solenoid can be maintained without the components of the solenoid 10 being deformed. Further, since the sliding of the shaft 25 is stopped by the step portion between the intermediate portion 28 and the tip portion 29 of the shaft 25, even if the shaft 25 and the movable magnetic pole 20 are separated, the movable magnetic pole 20 is fixed. The shaft 25 can be accurately slid by a predetermined stroke length so as to stop immediately before being attracted to the shaft 34. Further, since the E-ring 40 is used as a spring receiver, it is easy to accurately provide the spring receiver at a predetermined position on the peripheral side surface of the shaft 25. In addition, since the spring support surface 33b is formed on the shaft support member 30, it is not necessary to provide a second spring support.

  Further, when the energization of the coil 48 is stopped, the sliding of the movable magnetic pole 20 and the shaft 25 is stopped by the E-ring 40 coming into contact with the fixed magnetic pole 34. Therefore, a stopper for stopping the sliding is separately provided. There is no need. Furthermore, since the cylindrical portion 39 of the fixed magnetic pole 34 and the cylindrical portion 31 of the shaft support member 30 are fitted to each other, it is possible to easily set the stroke of the shaft 25 accurately to a predetermined length. Solenoids with little variation in length can be manufactured. In addition, since a gap for storing the grease attached to the shaft 25 is formed, it is possible to prevent the grease from penetrating to the periphery of the movable magnetic pole 20 and preventing the movable magnetic pole 20 from sliding. Further, since the flange member 50 is fitted so as to be in contact with the step portion of the shaft support member 30, the shaft support member 30 is fitted into the case 42 so that the case 42 and the flange member 50 are in contact with each other. These parts can be accurately fitted to each other, and a highly reliable solenoid can be manufactured. Furthermore, the end cap 44 and the O-ring 45 can reduce the impact sound when the movable magnetic pole 20 and the shaft 25 return to their original positions.

  Furthermore, a solenoid according to a second embodiment of the present invention will be described. FIG. 8 is a cross-sectional view showing a solenoid according to the second embodiment of the present invention. In FIG. 8, 28a is a fitting hole, 56 is a connecting member, 57 is a screw-in part, 58 is a through hole, and the other symbols are the same as those in FIG.

  In the solenoid 10 according to the second embodiment of the present invention, as shown in FIG. 8, the shaft 25 does not protrude from the through hole 33 a of the shaft support member 30, but the connecting member 56 protrudes. That is, there is no tip portion on the tip side of the shaft 25, and a screw hole 28 a is formed in the intermediate portion 28. The screwed portion 57 of the connecting member 56 is screwed into the screw hole 28a. Further, a through hole 58 is formed on the distal end side of the connecting member 56 and connects the link member of the load device. Other configurations are the same as those of the solenoid 10 according to the first embodiment.

  As described above, in the solenoid 10 according to the second embodiment of the present invention, even if stress is applied from a direction different from the central axis of the connecting member 56 from the link member of the load device, the stress is applied to the movable magnetic pole 20. Since it is not added, the same effect as the solenoid 10 according to the first embodiment can be obtained. Moreover, as shown in this embodiment, the present invention can be preferably applied to uses other than the lock mechanism.

  Furthermore, a solenoid according to a third embodiment of the present invention will be described. FIG. 9 is a sectional view showing a solenoid according to the third embodiment of the present invention. In FIG. 9, 59 is a spring receiving portion, and other reference numerals are the same as those in FIG.

  In the solenoid according to the third embodiment of the present invention, as shown in FIG. 9, an annular groove 27 is not formed in the region closest to the intermediate portion 28 on the peripheral side surface of the base end portion 26 of the shaft 25. Instead, a spring receiving portion 59 is formed instead. The E-ring 40 is not provided, and the spring receiving portion 59 acts in the same manner as the E-ring 40. The spring receiving portion 59 is formed when the shaft 25 is cut, and is integral with other portions of the shaft 25. Other configurations are the same as those of the solenoid 10 according to the first embodiment.

  As described above, in the solenoid 10 according to the third embodiment of the present invention, the spring receiver is not the E-ring but the spring receiver 59, so that the shaft 25 has more shaft than the solenoid 10 according to the first embodiment. Although cutting is complicated, a strong spring receiver integrated with the shaft 25 can be obtained.

  The present invention is not limited to the above-described content. For example, the end cap 44 and the O-ring 45 are omitted, and a groove parallel to the central axis is formed on the peripheral side surface of the movable magnetic pole 20. Alternatively, a pin protruding from the holding member 46 may be inserted, and the sliding range of the movable magnetic pole 20 may be regulated by this pin. Further, when grease is not applied to the shaft 25, the storage space 55 may be formed only in a volume necessary for storing the E-ring 40 and the spring 41. Further, the end of the case 42 may be caulked so as to be in close contact with the shaft support member 30 without providing the flange member 50. In addition, the cylindrical portion 31 of the shaft support member 30 may be fitted into the cylindrical portion 39 of the fixed magnetic pole 34. As in the above examples, various modifications can be made without departing from the scope described in each claim.

DESCRIPTION OF SYMBOLS 10 Solenoid 20 Movable magnetic pole 21 Main body part 22 Ring part 23 Recessed part 24 Tip part 24a Inclined surface 24b Tip surface 25 Shaft 26 Base end part 26a Base end face 27 Annular groove 28 Intermediate part 28a Screw hole 29 Tip part 30 Shaft support material 31 Tube Shaped portion 32 Base end portion 33 Tip portion 33a Through hole 33b Spring receiving surface 34 Fixed magnetic pole 35 Opposing portion 35a Inclined surface 36 Small diameter intermediate portion 37 Large diameter intermediate portion 38 Main body portion 39 Tubular portion 40 E ring 41 Spring 42 Case 43 Thin Portion 44 end cap 45 O-ring 46 pinching member 47 bobbin 48 coil 49 sleeve 50 collar member 51 opening portion 52 opening portion 53 opening portion 54 opening portion 55 storage space 56 connecting member 57 screwing portion 58 through hole 59 spring receiving portion 60 lock Plate material 61 Opening 62 Pressing member 63 Grease 70 Soleno De 71 movable magnetic pole 72 main body 73 distal end 74 shaft 75 fixed magnetic pole 76 supporting member 77 case 78 coil 79 bobbin 80 bearing 81 sleeve

Claims (10)

A movable magnetic pole provided so as to be slidable, a shaft having a base end portion disposed so as to be able to contact and separate from a distal end portion of the movable magnetic pole, and a through hole are formed, and the shaft can be slid by the through hole. A shaft support material to be supported, a coil disposed in the vicinity of the movable magnetic pole, an insertion hole through which the shaft is inserted, and a fixed magnetic pole that attracts the movable magnetic pole when the coil is energized, and the shaft In a solenoid having a spring provided so as to constantly urge the movable magnetic pole toward the movable magnetic pole side,
When the coil is energized, the movable magnetic pole presses and slides the shaft,
The shaft is stopped when a predetermined portion abuts against the shaft support, and the movable magnetic pole is stopped before being attracted to the fixed magnetic pole,
When the energization to the coil is stopped, the spring slides the shaft toward the movable magnetic pole,
The solenoid is characterized in that the shaft slides the movable magnetic pole to a position before energization of the coil.   2. The shaft according to claim 1, wherein a diameter of a tip portion is formed to be smaller than a diameter of an intermediate portion, and a step portion between the tip portion and the intermediate portion is the predetermined portion. The solenoid described.   The shaft includes a spring receiver that is formed so that a diameter of the base end portion is smaller than a diameter of the intermediate portion, and that receives one end portion of the spring in a region closest to the intermediate portion of the base end portion. The solenoid according to claim 1 or 2, wherein the solenoid is provided.   The solenoid according to claim 3, wherein the spring receiver is an E-ring.   The solenoid according to claim 3 or 4, wherein the shaft support member has a spring receiving surface that receives the other end of the spring formed around the through hole.   The shaft is configured such that, when energization of the coil is stopped, sliding by the urging force of the spring is stopped when the spring receiver comes into contact with the fixed magnetic pole. The solenoid according to any one of claims 3 to 5.   The fixed magnetic pole and the shaft support member are each formed with a cylindrical portion facing each other, and one of the cylindrical portions is fitted inside the other cylindrical portion. The solenoid according to any one of claims 1 to 6.   The cylindrical portion of the fixed magnetic pole and the cylindrical portion of the shaft support member are spaced from each other with a predetermined width in order to store the spring and store grease adhering to the shaft between the shaft and the shaft. The solenoid according to claim 7, wherein the solenoid is formed. The shaft support material is formed with a stepped portion such that the diameter on the side where the cylindrical portion is formed is larger than the diameter on the opposite side,
Furthermore, on the side opposite to the side where the tubular portion of the shaft support member is formed, a flange member fitted so as to contact the stepped portion of the shaft support member;
And a case that is formed in a substantially cylindrical shape, and that has a hollow portion in which the cylindrical portion of the shaft support member is fitted, and an end portion of which is provided in contact with the flange member. The solenoid according to claim 7 or 8. Furthermore, an end cap that is fitted to the opposite side of the hollow portion of the case to which the cylindrical portion of the shaft support member is fitted,
And a shock absorber provided at the base end of the movable magnetic pole and adapted to abut against the end cap before the spring receiver abuts against the fixed magnetic pole when energization of the coil is stopped. The solenoid according to claim 9.

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