JP2014127496A - Solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid allowed to be used for opening/closing a valve formed on a liquid pressure circuit of hydraulic pressure or the like, having a long stroke and allowed to be easily downsized by simplifying a structure.SOLUTION: Since a solenoid 10 is configured so that a sleeve 20 is formed like a bottomed cylindrical shape, a small diameter part 22 close to a bottom is inserted into an auxiliary magnetic pole part 61 and a large diameter part 21 close to an aperture is inserted into a cylindrical part 51 of a fixed magnetic pole 50, slide of a movable magnetic pole 30 is supported by the sleeve 20 whose thickness e.g. can be fairly thinned to 0.2 to 0.6 mm, so that formation of a dry bush is made unnecessary and the solenoid 10 can be easily downsized. Further, since liquid such as hydraulic oil can be prevented from being transmitted on a surface of the auxiliary magnetic pole part 61 or a collar-shaped part 62 and leaked into the inside and outside of a case 80, formation of an O-ring around the auxiliary magnetic pole part 61 or the collar-shaped part 62 is made unnecessary and the structure of the solenoid can be simplified.

Description

  The present invention relates to a solenoid, and more particularly to a solenoid that is used to open and close a valve provided in a hydraulic circuit such as hydraulic pressure and that has a long stroke length.

  Some solenoids are used in valves having a long stroke length such as spool valves. Of course, it is necessary to lengthen the stroke length of the solenoid used in such a valve. In such a solenoid, if the necessary thrust is ensured over the entire length of the stroke, and if it is attempted to prevent the axial deviation and inclination of the movable magnetic pole, the structure is more complicated than a solenoid with a short stroke length, and the size is reduced. The difficulty becomes higher. Hereinafter, an invention for miniaturizing a solenoid having a long stroke length will be described.

  FIG. 14 is a cross-sectional view showing the structure of a solenoid according to the prior art. In FIG. 14, 100 is a solenoid valve, 101 is a movable magnetic pole, 102 is a fixed magnetic pole, 103 is a taper, 104 is a lid, 105 is a fixed magnetic pole, 106 is an auxiliary magnetic pole, 107 is a shaft, and 108 is a sliding space. 109, 110 and 111 are spools, 112 is a case, 113 is an O-ring, 114 is a coil, 115 is a bobbin, and 116 is an O-ring.

  FIG. 14 is an invention disclosed in Japanese Patent Laid-Open No. 2006-194351. The solenoid of the present invention is incorporated in an electromagnetic valve 100 provided with three spools 109, 110 and 111. By energizing the coil 114, a magnetic circuit is generated around the fixed magnetic pole 102, the case 112, the lid portion 104, the fixed magnetic pole portion 105, and the auxiliary magnetic pole portion 106, and the movable magnetic pole 101 is attracted to the fixed magnetic pole 102 and slides. . Further, a shaft 107 is fitted in a through hole in the central axis direction of the movable magnetic pole 101, and the spools 109, 110 and 111 are slid as the movable magnetic pole 101 slides. In the above structure, the portion of the shaft 107 opposite to the spool 109 is inserted into a hole formed in the fixed magnetic pole portion 105. The portion in which the shaft 107 is inserted slides inside the hole of the fixed magnetic pole portion 105 when the coil 114 is energized. With the structure as described above, the shaft 106 is supported by the fixed magnetic pole portion 105. Therefore, it is not necessary to provide a separate bearing, and it is easy to reduce the size and prevent the axial deviation of the movable magnetic pole 101. ing. Further, since the shaft 106 is inserted into the hole of the fixed magnetic pole portion 105, the length of the electromagnetic valve 100 can be shortened by the length of the inserted portion.

  However, when the above-described solenoid structure is downsized not only in the axial direction of the shaft 106 but also in the radial direction, the shaft 106 can be inserted into the hole of the fixed magnetic pole portion 105. This is an obstacle to reducing the length and diameter of the direction. It is also conceivable to fit a drive bush inside the auxiliary magnetic pole portion 106 instead of the structure supported by the hole of the fixed magnetic pole portion 105. However, since the drive bush has a thickness of 2 to 3 mm, it is necessary to reduce the diameter of the movable magnetic pole 101 by at least the thickness or to reduce the thickness of the auxiliary magnetic pole portion 106. Reducing the diameter of the movable magnetic pole 101 or reducing the thickness of the auxiliary magnetic pole portion 106 is not preferable because the magnetic resistance increases and the thrust is reduced. Further, when the thickness of the auxiliary magnetic pole portion 106 is cut, the thickness of the fixed magnetic pole 102 taper portion 103 is considerably reduced, and the magnetic resistance of this portion is also increased. In addition, the O-ring 113 or 116 provided to prevent the hydraulic oil from leaking out from the periphery of the bobbin 115 can be simplified and reduced in size if either of them can be omitted. It becomes difficult to prevent leakage of hydraulic oil to the periphery. In any case, it is not easy to reduce the size without degrading the functionality and reliability of a solenoid with a long stroke length.

JP 2006-194351 A

  In order to solve the above-described problems, the present invention provides a solenoid that is used for opening and closing a valve provided in a hydraulic circuit such as a hydraulic pressure and that has a long stroke and has a simplified structure and facilitates downsizing. For the purpose.

  The invention according to claim 1 is formed in a cylindrical shape, is provided with a case having a first opening and a second opening, and is disposed on the first opening side of the case. A truncated cone having a cylindrical part that opens toward the second opening, and a part or all of the inner peripheral surface of the cylindrical part gradually increases in opening diameter toward the opening. A fixed magnetic pole formed in a shape, an auxiliary magnetic pole formed in a substantially bottomed cylindrical shape and having an opening opposed to the opening of the fixed magnetic pole, and the vicinity of the bottom of the auxiliary magnetic pole And a lid that is formed so as to protrude from the peripheral side surface of the case and has a hook-like portion that closes the second opening portion of the case; It is formed so that the diameter is larger than the portion near the bottom, and the portion near the bottom is the A sleeve inserted into the auxiliary magnetic pole part, and the cylindrical part inserted into the part near the opening part, and formed in a substantially cylindrical shape and slidable inside the sleeve A movable magnetic pole provided with a main body portion and a facing portion formed in a substantially truncated cone shape and facing the inner peripheral surface formed in the truncated cone shape of the fixed magnetic pole, and formed in a truncated cone shape; It is a solenoid characterized by having.

  According to a second aspect of the present invention, in the first aspect of the present invention, the sleeve is configured such that a portion of the auxiliary magnetic pole portion facing the bottom portion is in contact with an inner surface of the bottom portion of the auxiliary magnetic pole portion. It is a solenoid characterized by being arranged.

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the sleeve has an outer peripheral surface of a portion near the bottom portion in contact with an inner peripheral surface of the auxiliary magnetic pole portion, and the opening. The solenoid is characterized in that the inner peripheral surface of the portion closer to the portion is disposed so as to contact the outer peripheral surface of the cylindrical portion.

  According to a fourth aspect of the present invention, in the invention of the third aspect, the fixed magnetic pole is formed with an annular groove formed on an outer peripheral surface of the cylindrical portion, and is attached to the annular groove of the cylindrical portion. The solenoid further includes a ring.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the fixed magnetic pole is formed so as to project from the cylindrical portion and the first of the case. 1 is a solenoid having a hook-like portion that closes one opening, and the sleeve is formed such that an end on the opening side is separated from the hook-like portion of the case.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the sleeve is parallel to the sliding direction of the movable magnetic pole on the inner peripheral surface of the portion near the bottom. The solenoid is characterized in that a groove extending in the direction is formed.

  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 is formed with a through-hole penetrating the inside along the sliding direction of the movable magnetic pole. The movable magnetic pole is formed with a through-hole penetrating the main body portion and the protruding portion of the movable magnetic pole along a sliding direction, and a portion closer to the distal end is inserted into the through-hole of the fixed magnetic pole, The solenoid further includes a shaft that is fitted in the through hole of the movable magnetic pole, and that has a proximal end portion slightly protruding from the through hole of the movable magnetic pole.

  According to the first aspect of the present invention, the sleeve has a bottomed cylindrical shape, a portion closer to the bottom is inserted into the auxiliary magnetic pole portion, and a cylindrical portion of the fixed magnetic pole is inserted into the portion closer to the opening. With this construction, for example, the sliding of the movable magnetic pole is supported by a sleeve that can be made as thin as 0.2 to 0.4 mm, so there is no need to provide a drive bush, and the diameter of the solenoid Miniaturization in the direction is facilitated. Furthermore, it is possible to prevent liquid such as hydraulic oil from spreading along the surface of the auxiliary magnetic pole part or the bowl-like part into the case, or leaking outside the case. There is no need to provide an O-ring, and the structure can be simplified. As a result, the solenoid can be easily downsized.

  According to the second aspect of the present invention, the portion of the sleeve facing the bottom of the auxiliary magnetic pole is in contact with the inner surface of the bottom plate of the auxiliary magnetic pole. It is possible to prevent the portion being deformed from being gradually deformed by the collision of the movable magnetic pole or the shaft.

  According to the invention described in claim 3, the outer peripheral surface of the portion near the bottom of the sleeve is in contact with the inner peripheral surface of the auxiliary magnetic pole portion, and the inner peripheral surface of the portion near the opening is the outer peripheral surface of the cylindrical portion of the fixed magnetic pole portion. Therefore, the center axis of the sleeve can be accurately aligned with the fixed magnetic pole and the auxiliary magnetic pole portion of the lid, and the axial deviation of the movable magnetic pole can be prevented.

  According to the fourth aspect of the present invention, it is possible to prevent liquid such as hydraulic fluid from leaking from between the sleeve and the fixed magnetic pole.

  According to the fifth aspect of the present invention, even when the dimensional accuracy of the fixed magnetic pole or sleeve or other components is not high, the flange of the fixed magnetic pole collides with the sleeve and the end on the opening side during assembly. Thus, the sleeve can be prevented from being deformed. Therefore, the thickness of the sleeve can be reduced without considering deformation due to collision, and the solenoid can be easily downsized.

  According to the invention of claim 6, when the movable magnetic pole slides, the groove of the sleeve facilitates the adjustment of the differential pressure between the hydraulic circuit such as the oil passage and the gap between the bottom of the sleeve and the movable magnetic pole. It is possible to ensure the operability that tends to decrease when the size is reduced.

  According to the seventh aspect of the invention, the protruding portion of the shaft is prevented from sticking to the bottom portion of the sleeve of the movable magnetic pole. Therefore, it is not necessary to provide a separate spacer, and the size can be easily reduced.

It is sectional drawing which shows the electricity supply state of the solenoid which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the non-energized state of the solenoid which concerns on the 1st Embodiment of this invention. It is sectional drawing of the sleeve which concerns on the 1st Embodiment of this invention. It is a figure which shows the movable magnetic pole which concerns on the 1st Embodiment of this invention, (a) is sectional drawing, (b) is a top view. It is sectional drawing of the state which integrated the movable magnetic pole and the shaft. It is a figure which shows the fixed magnetic pole which concerns on the 1st Embodiment of this invention, (a) is sectional drawing, (b) is a top view. It is a figure which shows the lid | cover which concerns on the 1st Embodiment of this invention, (a) is sectional drawing, (b) is a top view. It is sectional drawing of the bobbin which concerns on the 1st Embodiment of this invention. It is sectional drawing (1) which shows the process of inserting the bobbin, sleeve, and cover which concern on the 1st Embodiment of this invention in a case. It is sectional drawing (2) which shows the process of inserting the bobbin, sleeve, and cover which concern on the 1st Embodiment of this invention in a case. It is sectional drawing which shows the electricity supply state of the solenoid which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the non-energized state of the solenoid which concerns on the 2nd Embodiment of this invention. It is a figure which shows the fixed magnetic pole which concerns on the 2nd Embodiment of this invention, (a) is sectional drawing, (b) is a top view. It is sectional drawing which shows the structure of the solenoid which concerns on a prior art.

  First, the solenoid according to the first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing the energized state of the solenoid according to the first embodiment of the present invention. In FIG. 1, 10 is a solenoid, 20 is a sleeve, 21 is a large-diameter portion, 22 is a small-diameter portion, 23 is a bottom portion, 24 is a stepped portion, 25 is a lead-in portion, 30 is a movable magnetic pole, 31 is a main body portion, and 32 is Opposing portions, 33 and 34 are communication grooves, 40 is a shaft, 42 is a proximal end portion, 43 is a protruding portion, 50 is a fixed magnetic pole, 51 is a cylindrical portion, 53 is a fitting portion, 54 is a hook-like portion, 55 Is a projecting portion, 56 is a through hole, 60 is a lid, 61 is an auxiliary magnetic pole portion, 62 is a hook-shaped portion, 66 is a bobbin, 67 and 68 are hook portions, 71 and 72 are terminal fittings, 73 is an O-ring, 75 is A coil, 76 is a sealing resin, 80 is a case, 81 is a fitting receiving portion, 82 is a thin portion, and 83 is a caulking portion. FIG. 2 is a cross-sectional view showing a non-energized state of the solenoid according to the first embodiment of the present invention. 2, 38 and 52 are frustoconical surfaces, 74 is a spacer, and the other symbols are the same as those in FIG.

  First, the outline of the solenoid 10 will be described. The solenoid 10 according to the first embodiment of the present invention is a direct acting solenoid that is mounted on a valve that is mainly used in a hydraulic circuit. That is, as shown in FIG. 1, when the movable magnetic pole 30 is attracted to the fixed magnetic pole 50, the solenoid 10 projects the shaft 40 and slides the valve body and the like. That is, when the movable magnetic pole 30 is energized to the coil 75, the movable magnetic pole 30 slides so as to fill the air gap with the stationary magnetic pole 50 by the flow of magnetic flux around the stationary magnetic pole 50, the case 80, the lid 60 including the auxiliary magnetic pole portion 61, and the movable magnetic pole 30. Move. When the energization of the coil 75 is stopped, the movable magnetic pole 30 slides away from the fixed magnetic pole 50 by a spring (not shown) provided outside the solenoid 10 to be in the state shown in FIG. Further, in order to increase the stroke length, the opposing portion 32 of the movable magnetic pole 30 and the cylindrical portion 51 of the fixed magnetic pole 50 are each formed into a sharp convex frustoconical shape and a deep concave frustoconical shape, respectively. The central axis of the facing portion is common. Further, the solenoid 10 is provided with a sleeve 20 as a bearing for the movable magnetic pole 30. A movable magnetic pole 30 is inserted into the sleeve 20 and a cylindrical portion 51 of the fixed magnetic pole 50 is also inserted into the sleeve 20. Further, between the large diameter portion 21 of the sleeve 20 and the cylindrical portion 51 of the fixed magnetic pole 50, the through hole of the O-ring fixed magnetic pole 50 is accommodated. The solenoid 10 may be used in a hydraulic circuit other than hydraulic pressure such as a hydraulic circuit.

  Next, each component of the solenoid 10 will be described. FIG. 3 is a cross-sectional view of the sleeve according to the first embodiment of the present invention. The reference numerals used in FIG. 3 are the same as those in FIG.

  The sleeve 20 is made of stainless steel and has a substantially bottomed cylindrical shape as a whole. In this embodiment, the wall thickness is 0.4 mm. This wall thickness can be appropriately set according to the size of the solenoid, and may be set to 0.2 mm or 1.0 mm, for example. Further, as shown in FIG. 3, the large diameter portion 21 that is a portion near the opening portion has a larger diameter than the small diameter portion 22 that is a portion near the bottom portion 23, and the portion between these is a short truncated cone shape. A step portion 24 is formed. In the state where the solenoid 10 is assembled, the large-diameter portion 21 is in a state where the cylindrical portion 51 of the fixed magnetic pole 50 is inserted therein and in contact with each other, as shown in FIGS. An O-ring 73 is provided between the large-diameter portion 21 and the cylindrical portion 51, and hydraulic oil that has entered the sleeve 20 through the through hole 56 of the fixed magnetic pole 50 is connected to the large-diameter portion 21. Leaking from the space between the cylindrical portion 51 is prevented. The large diameter portion 21 and the small diameter portion 22 are formed by drawing. Further, as shown in FIG. 3, a guide portion 25 is formed in the opening. The lead-in part 25 is formed in a truncated cone shape that is very short with respect to the central axis, whereby the opening of the sleeve 20 has a very short trumpet shape. When assembling the solenoid 10, it is necessary to insert the cylindrical portion 51 into the large-diameter portion 21, but by providing the guiding portion 25, the effect that the opening portion can be smoothly inserted without being caught on the end surface of the cylindrical portion 51. There is. In addition, as described later, there is an effect of preventing the O-ring 73 from being damaged in the assembly process.

  As shown in FIGS. 1 and 2, the small diameter portion 22 and the bottom portion 23 of the sleeve 20 are in contact with the auxiliary magnetic pole portion 61 when the solenoid 10 is assembled. As described above, the large diameter portion 21 is in contact with the cylindrical portion 51, and the sleeve 20 is disposed in contact with these magnetic poles. As will be described later, since the lid 60 and the fixed magnetic pole 50 are fitted to the case 80, they are accurately arranged. Therefore, the sleeve 20 whose arrangement is determined by the lid 60 and the fixed magnetic pole 50 also deviates from the position where the central axis should be originally installed, or the central axis of the sleeve 20 is inclined with respect to the direction where the sleeve 20 should be originally installed. Can be placed accurately without any problems. Therefore, the movable magnetic pole 30 that slides inside the sleeve 20 is also not displaced in the central axis, and hence the central axis of the shaft 40 fixed to the movable magnetic pole 30 is not displaced, and a highly accurate solenoid is provided. It becomes possible.

  Furthermore, since the bottom 23 is in contact with the auxiliary magnetic pole 61, it is possible to prevent the bottom 23 from being deformed by using the solenoid 10 for a long time. That is, when the energization to the coil 75 is stopped, as shown in FIG. 2, a light impact is applied to the bottom 23 of the protruding portion 43 of the shaft 40 by the spring force of the spring (not shown). Since the thickness of the bottom part 23 is very thin at 0.4 mm, it is considered that if this impact is received only by the bottom part 23, the bottom part 23 may be deformed or broken during long-term use. In this embodiment, the bottom 23 is in contact with the bottom of the auxiliary magnetic pole 61, and the bottom 23 is supported by the bottom of the auxiliary magnetic pole 61, so that the deformation of the bottom 23 can be prevented even if this impact is received. The stepped portion 24 is formed at a portion where a certain amount of gap can be maintained with respect to both the auxiliary magnetic pole portion 61 and the tubular portion 51. For example, if the sleeve 20 is formed at a position close enough to contact with the cylindrical portion 51, when the variation in the size of the sleeve 20 is relatively large, the cylindrical portion 51 is caught by the stepped portion 24, and the cylindrical portion 51 is This is because insertion into the large diameter portion 21 may be hindered.

  As described above, in this embodiment, since the sleeve 20 supports the sliding of the movable magnetic pole, it is not necessary to provide a drive bush or a dry bearing, and the diameter of the solenoid 10 can be reduced by 2 mm to 3 mm. In addition, the center axis of the sleeve 20 does not shift in the assembled state of the solenoid 10, and the movable magnetic pole 30 that is supported by the sleeve 20 in a slidable state and the central axis of the shaft 40 that is integral with the movable magnetic pole 30. There is no slippage and no tilting. Furthermore, since the sleeve 20 is provided with the bottom 23, the hydraulic oil infiltrates each part in the case 80 along the surface of the auxiliary magnetic pole part 61 or the flanged part 62 of the lid 60, or leaks to the outside of the case 80. Therefore, it is not necessary to provide an O-ring around the auxiliary magnetic pole part 61 or the hook-like part 62, and the structure can be simplified. As a result, the solenoid 10 itself can be easily downsized.

  Next, the movable magnetic pole will be described. 4A and 4B are diagrams showing the movable magnetic pole according to the first embodiment of the present invention, where FIG. 4A is a sectional view and FIG. 4B is a plan view. In FIG. 4, 35 is a through hole, 36 and 37 are caulking grooves, 38 is a truncated cone surface, 39 is an upper end surface, and the other symbols are the same as those in FIG.

  The movable magnetic pole 30 extends from a main body portion 31 formed in a substantially cylindrical shape so that the facing portion 32 protrudes toward the cylindrical portion 51 of the fixed magnetic pole 50. Further, the movable magnetic pole 30 is formed with a through-hole 35 that penetrates the main body 31 and the opposing portion 32 along the central axis. Further, caulking grooves 36 and 37 for fixing the shaft 40 by caulking are formed annularly around the upper and lower openings of the through hole 35. The facing portion 32 is formed in a substantially truncated cone shape, and is formed at an acute angle toward the tubular portion 51 in order to make the stroke length of the shaft 40 as long as possible. The frustoconical surface 38 of the facing portion 32 is formed so that the inclination angle with respect to the central axis of the movable magnetic pole 30 is the same as the inclination angle of the cylindrical portion 51 of the fixed magnetic pole 50. When 51 approaches, a lot of magnetic flux flows in a direction perpendicular to the central axis or a direction close thereto. In addition, by providing the spacer 74 which will be described later, even when the movable magnetic pole 30 comes closest to the fixed magnetic pole 50, the facing portion 32 and the cylindrical portion 51 do not contact each other.

  As shown in FIGS. 1 and 2, the peripheral side surface of the main body 31 is surrounded by the auxiliary magnetic pole 61. Since the main body 31 and the auxiliary magnetic pole 61 are disposed in a very close state via the sleeve 20 having a thickness of 0.4 mm, the main body 31 and the auxiliary magnetic pole 61 are located between the two rather than the solenoid according to the prior art using a drive bush as a bearing. The reluctance of the magnetic resistance becomes very small, and the magnetic efficiency can be greatly improved. Therefore, the size can be reduced more easily than the solenoid according to the related art in which the thrust of the shaft is substantially equal. Further, as shown in FIG. 4, communication grooves 33 and 34 are formed on the peripheral side surface of the main body 31 in parallel with the central axis. The communication grooves 33 and 34 communicate the working oil through the gap between the upper end surface 39 of the main body 31 and the bottom 23 of the sleeve 20 and the space on the shaft side. In addition, when the solenoid 10 is a comparatively large thing, the thickness of the sleeve 20 will also be 1.0 mm, for example. Therefore, the movable magnetic pole 30 may not be formed with the communication grooves 33 and 34 but may be formed with one or a plurality of grooves on the inner peripheral surface of the sleeve 20 along the central axis of the sleeve 20. In addition, although this groove | channel may be formed only in the small diameter part 22, you may make it from the small diameter part 22 to the level | step difference part 24, or the small diameter part 22 to the large diameter part 21. FIG.

  Next, the shaft will be described. FIG. 5 is a cross-sectional view of a state in which the movable magnetic pole and the shaft are integrated. In FIG. 5, reference numeral 41 denotes a tip side portion, and the other reference numerals are the same as those in FIGS. 2 and 4.

  As shown in FIG. 5, the shaft 40 according to this embodiment has a base end portion 42 inserted into the through hole 35 of the movable magnetic pole 30, and in this state, the upper and lower openings and the caulking grooves of the through hole 35. The part between 36 and 37 is fixed to the movable magnetic pole 30 by caulking. Further, since the solenoid has a long stroke length, the tip end portion 41 protrudes from the through hole 35 and extends long. Further, the end portion on the proximal end side of the shaft 40 is a protruding portion 43 that slightly protrudes from the through hole 35. The protrusion 43 protrudes toward the bottom 23 of the sleeve 20 from the upper end surface 39 so that the upper end surface 39 and the bottom 23 do not come into contact with each other when energization to the coil 75 is stopped. is there. That is, when the upper end surface 39 and the bottom 23 come into contact with each other, the two are stuck due to the influence of residual magnetism, and the operation of the movable magnetic pole 30 may be hindered when the coil 75 is energized. Further, the shaft 40 slightly protrudes from the upper end surface 39. In the prior art, a spacer is provided to prevent sticking of the movable magnetic pole, but in this embodiment, the number of parts is reduced by substituting the shaft 40.

  Next, the fixed magnetic pole will be described. 6A and 6B are diagrams showing the fixed magnetic pole according to the first embodiment of the present invention, in which FIG. 6A is a sectional view and FIG. 6B is a plan view. In FIG. 6, reference numeral 57 denotes an annular groove, and other reference numerals are the same as those in FIG.

  The fixed magnetic pole 50 constitutes a part of the magnetic circuit, is a lid of the case 80, and further plays a role of guiding the sliding of the long shaft 40. That is, as shown in FIG. 6, the whole is formed in a substantially cylindrical shape, and the cylindrical portion 51 extends toward the inner side of the case 80, and the protruding portion 55 extends toward the outer side. Further, the fitting portion 53 and the hook-like portion 54 project in a hook shape near the center in the central axis direction. Furthermore, a through-hole 56 that penetrates the cylindrical portion 51 and the protruding portion 55 along the central axis is formed. As described above, the cylindrical portion 51 of the fixed magnetic pole 50 has the concave truncated cone surface 52 facing the truncated cone surface 38 of the movable magnetic pole 30 and generates an attractive force to the movable magnetic pole 30 when the coil 75 is energized. Play a role. An annular groove 57 that circulates around the outer peripheral surface is formed at a portion of the outer peripheral surface of the cylindrical portion 51 near the fitting portion 53. Further, an O-ring 73 is attached to the annular groove 57, and the O-ring 73 is sandwiched between the large-diameter portion 21 of the cylindrical portion 51 sleeve 20. Further, the fitting portion 53 is fitted into the fitting receiving portion 81 of the case 80 as shown in FIG. The hook-shaped portion 54 functions as a stopper when press-fitting the fitting portion 53 by projecting around the fitting portion 53. The protruding portion 55 protrudes longer toward the outside of the case 80 in order to ensure a sufficient length of the through hole 56. In addition, since there is a gap between the through hole 56 and the shaft 40, hydraulic oil enters the cylindrical portion 51 side from the valve body side of the hydraulic circuit (not shown). Since it is provided, it does not ooze out of the sleeve 20.

  Further, the lid will be described. 7A and 7B are views showing the lid according to the first embodiment of the present invention, where FIG. 7A is a sectional view and FIG. 7B is a plan view. In FIG. 7, 63 is a bottom plate portion, 64a is a bottom surface, 64b is an inner peripheral surface, 65a and 65b are notches, and the other symbols are the same as those in FIG.

  The lid 60 includes an auxiliary magnetic pole portion 61 that forms part of the magnetic circuit, and a hook-shaped portion 62 that serves as a lid for the case 80. The auxiliary magnetic pole portion 61 is formed in a substantially bottomed cylindrical shape, and a hook-like portion 62 is formed so as to protrude in a hook shape from an end portion on the side where the bottom is located. As described above, the bottom surface 64 a and the inner peripheral surface 64 b of the auxiliary magnetic pole portion 61 are in contact with the bottom portion 23 and the small diameter portion 22 of the sleeve 20, and also serve as a reinforcing material for the sleeve 20. Further, the thickness of the bottom plate portion 63 of the auxiliary magnetic pole portion 61 is formed so as to be thinner than the thickness of the bowl-shaped portion 62. That is, the bottom plate portion 63 is a portion that constitutes a part of the lid of the case 80, but is also a portion that contacts the bottom portion 23 of the sleeve 20. Therefore, the length of the solenoid 10 in the central axis direction of the shaft 40 is shortened by thinning the bottom plate portion 63 within a range that does not hinder the strength as a lid. Further, as shown in FIG. 7B, the hook-shaped portion 62 has notches 65 a and 65 b for leading the terminal fittings 71 and 72 out of the case 80.

  Next, the bobbin will be described. FIG. 8 is a cross-sectional view of the bobbin according to the first embodiment of the present invention. In FIG. 8, 69 is a holding part, 70a and 70b are inner peripheral surfaces, 70c is a step part, and other reference numerals are the same as those in FIG.

  As shown in FIG. 8, the bobbin 65 is formed in a substantially cylindrical shape as a whole, and a coil 75 is provided between the flange portion 67 and the flange portion 68 in view of the coil wire. Further, the stepped portion 70c is provided by forming an inner peripheral surface 70a having a slightly larger diameter and an inner peripheral surface 70b having a slightly smaller diameter. As shown in FIG. 1, the stepped portion 70 c is provided in contact with the lower end portion of the auxiliary magnetic pole portion 61. When the solenoid 10 is assembled by a method to be described later, even when the bobbin 65 is not sufficiently pushed into the auxiliary magnetic pole portion 61, when the lid 60 is press-fitted or when the thin portion 82 is caulked, the tip end portion of the auxiliary magnetic pole portion 61 Comes into contact with the stepped portion 70c, so that the bobbin 65 is placed at a predetermined position when the assembly of the solenoid 10 is finished. Further, since the bobbin 65 does not come into contact with the hydraulic oil, as shown in FIG. 1, the terminal fitting 71 and the terminal fitting 72 are held by the holding portion 69 and another holding portion (not shown). The metal fitting is directly led out of the case 80. In addition, since the bobbin 65 according to this embodiment does not need to be provided with an O-ring for preventing the hydraulic oil from leaching out around the bobbin 65, the degree of freedom in design for fixing the wiring and terminal fittings is relatively high. It can be said.

  Furthermore, the process of inserting the bobbin, the sleeve, and the lid according to the first embodiment of the present invention, which is one of the features of the first embodiment of the present invention, will be described. FIG. 9 is a cross-sectional view (1) showing a step of inserting the bobbin, the sleeve, and the lid according to the first embodiment of the present invention into the case. Reference numerals used in FIG. 9 are the same as those in FIG. FIG. 10 is a cross-sectional view (2) showing a step of inserting the bobbin, sleeve and lid according to the first embodiment of the present invention into the case. The reference numerals used in FIG. 10 are the same as those in FIG.

  In the solenoid 10 according to this embodiment, the shaft 40 is first inserted into the through hole 35 of the movable magnetic pole 30 and fixed by caulking. Next, the shaft 40 is inserted into the through hole 56 of the fixed magnetic pole 50, and the facing portion 32 is inserted into the cylindrical portion 51. In addition, the large diameter portion 21 of the sleeve 20 is pushed into the auxiliary magnetic pole portion 61, and the auxiliary magnetic pole portion 61 is pushed into the hollow portion of the bobbin 66. As a result, the sleeve 20 and the bobbin 66 are integrated with the lid 60. Next, the hook-like portion 62 is fixed to the case 80 as follows. First, as shown in FIG. 9, the sleeve 20 and the bobbin 66 are inserted into the case 80 while supporting the lid 60. When the sleeve 20 is inserted to some extent, the sleeve 20 and the cylindrical portion 51 come into contact with each other. However, since the guide portion 25 guides the cylindrical portion 51, the cylindrical portion 51 is smoothly inserted into the large diameter portion 21 of the sleeve 20. When the hook-shaped portion 62 comes into contact with the thin portion 82 of the case 80, the hook-shaped portion 62 is lightly pressed. At this time, as shown in FIG. 10, the sleeve 20 and the O-ring 73 come into contact with each other. However, since the guiding portion 25 attracts the O-ring 73, it is possible to prevent the O-ring 73 from being cut by the tip portion of the sleeve 20. . When the bottom plate portion 63 and the bottom portion 23 of the sleeve 20 come into contact with each other, the thin portion 82 is caulked to fix the lid 60. Further, a resin is poured onto the lid 60 to form a sealing resin 76, which is in the state shown in FIG.

  By the way, for example, if the drawing process for forming the large diameter portion 21 and the small diameter portion 22 of the sleeve 20 is performed by a person who is not highly skilled, the length of the sleeve 20 in the central axis direction tends to vary. When this length is longer than the predetermined length, the guiding portion 25 is positioned below the original position shown in FIG. 1, but the guiding portion 25 of the sleeve 20 and the fixed magnetic pole 50 are fitted. Since a predetermined gap is set between the portion 53 and the gap 53, the gap is reduced. However, when the lid 60 is press-fitted, the guiding portion 25 is not strongly deformed by being pressed against the fitting portion 53. In addition, the sleeve 20 may be displaced downward due to an impact from the outside in the manufacturing process, and the guide portion 25 may be assembled in a state where the guide portion 25 is in contact with the fitting portion 53. However, even in such a state, when energization of the coil 75 is repeated several times or more in the operation check test after assembly, the projecting portion 43 of the shaft 40 collides with the bottom portion 23 of the sleeve 20, thereby causing the sleeve 20. Is pushed into the lid 60 side, so that the bottom portion 23 of the sleeve 20 and the bottom plate portion 63 of the lid 60 are in contact with each other. As described above, the solenoid 10 according to this embodiment also has a great feature in that it is configured to self-repair inconveniences in the assembling process in the assembling process or the operation check test after assembling. In addition, defects due to damage to the O-ring by the sleeve can be eliminated.

  Further, other components will be described with reference to FIG. In the case 80, the thickness of the fitting receiving portion 81 is made thicker than that of the other portions, so that the fixed magnetic pole 50 is firmly fixed and hydraulic fluid does not leak from between the fitting portion 53. Further, the upper portion of the thin portion 82 becomes the caulking portion 83 by caulking after the lid 50 is press-fitted in the procedure shown in FIG. Further, a sealing resin 76 is provided in a space surrounded by the caulking portion 83 to protect the terminal fitting 71 and the terminal fitting 72. In addition, as shown in FIG. 2, a spacer 74 is provided at a portion corresponding to the bottom of the substantially frustoconical internal space of the cylindrical portion 51 of the fixed magnetic pole 50. The spacer 74 regulates the sliding range of the movable magnetic pole 30 so that the frustoconical surface 38 of the facing portion 32 and the frustoconical surface 52 of the cylindrical portion 51 do not contact each other. This prevents the frustoconical surface 38 and the frustoconical surface 52 from coming into contact with each other, so that the operation reliability of the solenoid 10 can be improved.

  As described above, in the solenoid 10 according to the first embodiment of the present invention, the sleeve 20 has a bottomed cylindrical shape, and the small-diameter portion 22 closer to the bottom portion is inserted into the auxiliary magnetic pole portion 61, and the opening portion Since the cylindrical portion 51 of the fixed magnetic pole 50 is inserted inside the large-diameter portion 21 on the side, the sleeve 20 can be moved by the sleeve 20 which can be made considerably thin, for example, 0.2 to 0.4 mm. Since the sliding of the magnetic pole 30 is supported, it is not necessary to provide a drive bush, and the solenoid 10 can be easily downsized in the radial direction. Furthermore, since liquid such as hydraulic oil can be prevented from spreading inside the case 80 through the surface of the auxiliary magnetic pole part 61 or the bowl-shaped part 62 or leaking out of the case 80, the auxiliary magnetic pole part 61 or It is not necessary to provide an O-ring around the shape portion 62, and the structure can be simplified. As a result, the solenoid 10 can be easily downsized. Further, since the inner side surface of the bottom plate portion 63 of the auxiliary magnetic pole portion 61 facing the bottom portion 23 of the sleeve 20, that is, the bottom surface 64 a of the cup-shaped internal space is brought into contact, the bottom portion 23 is the protruding portion 43 of the shaft 40. Can be prevented from gradually deforming due to collision. In addition, the outer peripheral surface of the small-diameter portion 22 of the sleeve 20 is in contact with the inner peripheral surface of the auxiliary magnetic pole portion 61, and the inner peripheral surface of the large-diameter portion 21 is in contact with the outer peripheral surface of the cylindrical portion 51. In addition, the center axis of the sleeve 20 can be accurately aligned with the auxiliary magnetic pole portion 61, and the axial deviation of the movable magnetic pole 30 can be prevented. Furthermore, since the O-ring 73 is provided between the large-diameter portion 21 and the cylindrical portion 51, it is possible to prevent hydraulic oil from leaking from between these. Further, since there is a gap between the guide portion 25 of the sleeve 20 and the fitting portion 53 of the fixed magnetic pole 50, even if the dimensional accuracy of the fixed magnetic pole 50, the sleeve 20, or other components is not high, the guide portion 25 and the guide portion 25 are fitted. It can prevent that the sleeve 20 deform | transforms by colliding with the joint part 53. FIG. Therefore, the thickness of the sleeve 20 can be reduced without considering deformation due to collision, and the solenoid 10 can be easily downsized. Furthermore, the end on the opening side can securely hold the hook-like portion of the case 80 and the separation connecting means in the first region. Since the communication grooves 33 and 34 are formed on the peripheral side surface of the main body 31, when the movable magnetic pole 30 slides, the communication grooves 33 and 34 are formed on the oil path, the bottom of the sleeve 20, and the upper end surface 39 of the movable magnetic pole 30. Since adjustment of the differential pressure with respect to the gap is promoted, it is possible to ensure operability that tends to decrease when the device is downsized. In addition, the protrusion 43 of the shaft 40 prevents the movable magnetic pole 30 from sticking to the bottom 23 of the sleeve 20. Therefore, it is not necessary to provide a separate spacer, and the size can be easily reduced.

  Subsequently, a solenoid according to a second embodiment of the present invention will be described. FIG. 11 is a cross-sectional view showing the energized state of the solenoid according to the second embodiment of the present invention. In FIG. 11, 11 is a solenoid, 84 is a case, 85 is a thin portion, 86 is a caulking portion, 86 is a thin portion, 90 is a fixed magnetic pole, 91 is a facing portion, 93 is a fitting portion, 94 is a stepped portion, 95 Is a projecting portion, 96 is a through hole, 97 is an annular groove, and the other symbols are the same as those in FIG. FIG. 12 is a sectional view showing a non-energized state of the solenoid according to the second embodiment of the present invention. In FIG. 12, 92 is a truncated cone surface, and other reference numerals are the same as those in FIG. Furthermore, FIG. 13 is a figure which shows the fixed magnetic pole which concerns on the 2nd Embodiment of this invention, (a) is sectional drawing, (b) is a top view. The reference numerals used in FIG. 13 are the same as those in FIG.

  As shown in FIGS. 11 and 12, the solenoid 11 according to the second embodiment of the present invention has a simpler structure of the case 84 than that according to the second embodiment. That is, the portion near the opening on the fixed magnetic pole 90 side of the case 84 is a thin portion 87 similar to the thin portion 85 on the lid 60 side, and the fitting portion 93 of the fixed magnetic pole 90 is fitted to the thin portion 87. ing. As shown in FIG. 13, a stepped portion 94 is formed outside the fitting portion 93 in order to increase the rigidity as a lid. The caulking portion 86 of the case 84, the opposing portion 91 of the fixed magnetic pole 90, the truncated cone surface 92, the protruding portion 95, the annular groove 97, and the through hole 62 have the same shape and structure as those according to the first embodiment. It is.

  The solenoid 11 configured as described above is suitable for applications in which the thin portion 87 of the case 84 is thinner and easier to process than the one according to the first embodiment, and thus the rigidity of this portion is not so required. Yes. Since the configuration other than the portions described above is the same as that according to the first embodiment, the same operational effects as those according to the first embodiment can be obtained.

  The present invention is not limited to the contents described above. For example, a shaft-like protrusion may be provided on the fixed magnetic pole itself, instead of providing a shaft on the fixed magnetic pole. Further, an oil passage for holding the spool with respect to the fixed magnetic pole and a spool may be provided so as to be integrated with the valve. Further, the lid and the auxiliary magnetic pole may be separated to be independent components. As described above, various modifications can be made without departing from the scope described in each claim.

DESCRIPTION OF SYMBOLS 10 Solenoid 11 Solenoid 20 Sleeve 21 Large diameter part 22 Small diameter part 23 Bottom part 24 Step part 25 Guide part 30 Movable magnetic pole 31 Main body part 32 Opposite part 33 Communication groove 34 Communication groove 35 Through hole 36 Caulking groove 37 Caulking groove 38 Cone Base surface 39 Upper end surface 40 Shaft 41 Front end side portion 42 Base end side portion 43 Projection portion 50 Fixed magnetic pole 51 Cylindrical portion 52 Frustum surface portion 53 Fitting portion 54 Projection portion 55 Protrusion portion 56 Through hole 57 Annular groove 60 Lid 61 Auxiliary magnetic pole Portion 62 flange portion 63 bottom plate portion 64a bottom surface 64b inner peripheral surface 65a cutout portion 65b cutout portion 66 bobbin 67 flange portion 68 flange portion 69 holding portion 70a inner peripheral surface 70b inner peripheral surface 70c stepped portion 71 terminal fitting 72 terminal fitting 73 O Ring 74 Spacer 75 Coil 76 Sealing resin 80 Case 81 Fitting receiving portion 82 Thin portion 83 Caulking portion 84 Case 85 Meat Part 86 caulking part 87 thin part 90 fixed magnetic pole 91 opposing part 92 frustoconical surface 93 fitting part 94 stepped part 95 projecting part 96 through hole 97 annular groove 100 electromagnetic valve 101 movable magnetic pole 102 fixed magnetic pole 103 taper part 104 lid part 105 fixed Magnetic pole part 106 Auxiliary magnetic pole part 107 Shaft 108 Sliding space 109 Spool 110 Spool 111 Spool 112 Case 113 O-ring 114 Coil 115 Bobbin 116 O-ring

Claims (7)

A case having a first opening and a second opening, and having a cylindrical shape;
A cylindrical portion that is disposed on the first opening side of the case and that opens toward the second opening side, and a part or all of the inner peripheral surface of the cylindrical portion is provided. A fixed magnetic pole formed in a truncated cone shape such that the opening diameter gradually increases toward the opening;
An auxiliary magnetic pole portion formed in a substantially bottomed cylindrical shape and having an opening portion opposed to the opening portion of the fixed magnetic pole, and formed so as to protrude from a peripheral side surface in the vicinity of the bottom portion of the auxiliary magnetic pole portion. And a lid provided with a hook-like portion that closes the second opening of the case;
A substantially bottomed cylindrical shape is formed such that the portion near the opening is larger in diameter than the portion near the bottom, and the portion near the bottom is inserted into the auxiliary magnetic pole portion, and the opening A sleeve in which the cylindrical portion is inserted inside the portion close to the portion;
A main body portion formed in a substantially cylindrical shape and slidable inside the sleeve, and an inner peripheral surface formed in a substantially truncated cone shape and formed in a truncated cone shape of the fixed magnetic pole And a movable magnetic pole provided with an opposing portion formed in a truncated cone shape.   2. The solenoid according to claim 1, wherein the sleeve is disposed such that a portion of the auxiliary magnetic pole portion facing the bottom portion contacts an inner surface of the bottom portion of the auxiliary magnetic pole portion.   The sleeve is disposed such that the outer peripheral surface of the portion near the bottom portion is in contact with the inner peripheral surface of the auxiliary magnetic pole portion, and the inner peripheral surface of the portion near the opening portion is in contact with the outer peripheral surface of the cylindrical portion. The solenoid according to claim 1, wherein the solenoid is provided. The fixed magnetic pole has an annular groove formed on the outer peripheral surface of the cylindrical portion,
The solenoid according to claim 3, further comprising an O-ring mounted in the annular groove of the cylindrical portion. The fixed magnetic pole is formed so as to protrude from the cylindrical portion and includes a hook-shaped portion that closes the first opening of the case.
The solenoid according to any one of claims 1 to 4, wherein the sleeve is formed so that an end on the opening side is separated from the flange-shaped portion of the case.   6. The sleeve according to claim 1, wherein a groove extending in parallel with a sliding direction of the movable magnetic pole is formed on an inner peripheral surface of a portion near the bottom portion. Solenoid. The fixed magnetic pole is formed with a through-hole penetrating the inside along the sliding direction of the movable magnetic pole,
The movable magnetic pole is formed with a through-hole penetrating the main body portion and the protruding portion of the movable magnetic pole along the sliding direction.
A portion near the tip is inserted into the through hole of the fixed magnetic pole, a portion near the base end is fitted into the through hole of the movable magnetic pole, and a portion near the base end is slightly from the through hole of the movable magnetic pole. The solenoid according to claim 1, further comprising a projecting shaft.

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