JP6007432B2 - solenoid valve - Google Patents

Description

  The present invention relates to a solenoid valve, and more particularly to a solenoid valve used for a tilt cylinder of a forklift.

  In a forklift, a pallet into which a fork is inserted is moved up and down by a mast. The mast expands and contracts by the lift cylinder, and the fork rises when the mast extends. Further, the mast is tilted back and forth by a tilt cylinder to facilitate the transfer of the load on the pallet. This tilt cylinder operates at a low speed when the fork is raised, because the load on the pallet may collapse if the mast tilts rapidly when the pallet is located at a high place. Is configured to tilt slowly. Therefore, the electromagnetic valve used for the tilt cylinder functions as a flow control valve. The technique disclosed in Japanese Patent Laid-Open No. 8-326936 is an example of such a solenoid valve. Hereinafter, the electromagnetic valve disclosed in this publication will be described.

  Below, the prior art of the solenoid valve used for the tilt cylinder of a forklift is demonstrated. FIG. 5 is a cross-sectional view showing the structure of a conventional electromagnetic valve. In FIG. 5, 80 is a spool, 81 is a spring, 82 is a plunger, 82a is a sliding hole, 82b is a land portion, 83 is a first passage, 84 is a second passage, 85 is a groove, 86 is a spring chamber, 87 is a pilot passage, 88 is a tank passage, and 89 is a drain hole.

  As shown in FIG. 5, the spool 80 forms a sliding hole 82a having an opening on the inner periphery along the axial direction with a first return passage 83 and a second return passage 84, and the sliding hole 82a has a sliding hole 82a. Is provided with a plunger 82 having a groove 85 that opens and closes between the first passage 83 and the second passage 84 in accordance with the sliding position. Further, a spring chamber 86 is formed at a position on one end side of the plunger 82 and communicating with the sliding hole 82a, and a spring 81 for urging the plunger 82 toward the other end side is provided in the spring chamber 86. Further, a pilot passage 87 is provided on the other end side of the plunger 82 to introduce a pilot pressure at a position opening in the sliding hole 82 a to urge the rear end surface of the plunger 82 and move it toward the one end side against the spring 81. Furthermore, a tank passage 88 that is always open to the spring chamber 86 and a drain hole 89 that is always blocked by the land portion 82b regardless of the position of the plunger 82 are provided.

  By adopting a structure that allows leakage at the plunger 82 that is the spool valve body and the peripheral portion, the processing accuracy of the sliding hole 82a and the plunger 82 that is the spool valve body can be lowered, and the manufacturing cost can be reduced. is there. However, a number of oil passages corresponding to the first return passage 83, the second return passage 84, the tank passage 88, the pilot passage 87, and the drain hole 89 need to be provided around the spool 80. Therefore, when viewed as a whole solenoid valve, the structure is complicated and it is difficult to reduce the size. If a solenoid is used, a pilot passage or the like can be omitted, but a relatively large solenoid with a long stroke is required, and this also makes it difficult to reduce the size.

JP-A-8-326936

  In order to solve the above-described problems, the present invention provides an electromagnetic valve that is mainly used in a tilt cylinder of a forklift, has a structure that can be easily downsized, has a simple oil passage configuration, and can be manufactured at low cost. For the purpose.

  The invention according to claim 1 is provided such that the valve seat, the communication passage connecting the first oil passage and the second oil passage, and the communication passage is opened and closed by contacting and separating from the valve seat. And a movable magnetic pole that is directly or indirectly connected to the valve body and that is provided to move the valve body toward and away from the valve seat by sliding along a central axis. In the electromagnetic valve provided, the valve body includes a hollow portion formed so as to open to a portion of the communication passage on the first oil passage side, and one of the valve body is provided on a portion of the second oil passage of the communication passage. The flow rate of oil per unit time when the valve body is in contact with the valve seat and the valve body is separated from the valve seat. A through-hole having a diameter smaller than the flow rate of oil per unit time when An electromagnetic valve according to claim Rukoto.

  The invention according to claim 2 is the invention according to claim 1, wherein the valve seat is formed such that a portion in contact with the valve body and a surface in the vicinity thereof form an inverted frustoconical shape, The valve body is an electromagnetic valve characterized in that a distal end portion is in contact with and separated from the valve body, and a portion near the distal end is formed in a substantially cylindrical shape.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the valve body has the tip portion facing the first oil passage, and the hollow portion is the tip. It is an electromagnetic valve characterized by opening in the part.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the valve body has a peripheral side surface of the portion near the tip facing the second oil passage. And the hollow portion is open on the peripheral side surface near the tip portion.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects of the present invention, the valve body has a diameter closer to the proximal end than a portion closer to the distal end. And having a step portion between the portion near the base end and the portion near the tip end, and further inserted through the portion near the base end and in contact with the step portion. A provided spacer, a spring provided so that one end abuts against the spacer, a spring receiver provided so as to abut on the other end of the spring, and one end abuts against the spring receiver, and the other end And a shaft provided so that the portion comes into contact with the movable magnetic pole.

  According to the first aspect of the present invention, the valve body has a hollow portion formed so as to open to a portion of the communication passage on the first oil passage side, and one of the valve body is on a portion of the second oil passage of the communication passage. When the valve body is spaced from the valve seat when the valve body is in contact with the valve seat and the other is open to the hollow portion Therefore, the solenoid can be opened and closed even with a solenoid having a short stroke length, and downsizing is very easy. Furthermore, it is not necessary to form another communication passage having a small passage area in the constituent members around the valve body, and the electromagnetic valve used for tilt control of the forklift can be easily reduced in size.

  According to the second aspect of the present invention, the portion of the valve seat that contacts the valve body and the surface in the vicinity thereof are formed in an inverted truncated cone shape, and the portion near the tip of the valve body is formed in a substantially cylindrical shape. The shape of the valve body becomes simple and can be manufactured at low cost.

  According to the third aspect of the present invention, the distal end portion of the valve body faces the first oil passage and the hollow portion opens at the distal end portion, so the configuration of the hollow portion of the valve body is simplified. Can be manufactured at low cost.

  According to the fourth aspect of the invention, since the peripheral side surface of the portion near the tip of the valve body faces the second oil passage and the hollow portion opens on the peripheral side surface near the tip, both A directional solenoid valve can be realized with a simple structure and can be manufactured at low cost. The bidirectionality required for the solenoid valve used for tilt control of a forklift can be secured. In addition, a spring having a smaller elastic force than an electromagnetic valve having a structure that completely cuts off the oil flow can be used.

  According to the fifth aspect of the present invention, the spring, the spring receiver, and the shaft can be accommodated in the space having a small diameter between the valve body and the movable magnetic pole, and the miniaturization is further facilitated.

It is sectional drawing which shows the solenoid valve which concerns on the 1st Embodiment of this invention, (a) is a non-energized state, (b) shows an energized state. It is a partial expanded sectional view of the valve body of the solenoid valve concerning a 1st embodiment of the present invention, and its peripheral part, (a) shows a deenergized state and (b) shows an energized state. It is a figure which shows the valve body of the solenoid valve which concerns on the 1st Embodiment of this invention, (a) is a top view, (b) is a side view, (c) is sectional drawing. It is a figure which shows the solenoid valve which concerns on the 2nd Embodiment of this invention, (a) is a top view, (b) is a partial expanded sectional view of a valve body and its peripheral part. It is sectional drawing of the solenoid valve which concerns on a prior art.

  A solenoid valve according to a first embodiment of the present invention will be described. 1A and 1B are sectional views showing a solenoid valve according to a first embodiment of the present invention, where FIG. 1A shows a non-energized state and FIG. 1B shows an energized state. In FIG. 1, 10 is a solenoid valve, 11 is a communication passage component, 12 is a solenoid component, 20 is a valve body, 25 is a hollow portion, 26a and 26b are through holes, 30 is a communication channel component, and 31 is a first member. Oil passage side communication passage, 32 is a valve seat member fitting hollow portion, 33 is an annular communication passage, 34 is a second oil passage side communication passage, 36 is a valve seat portion, 37 is a seat surface, 38 is a valve seat hollow portion, 40 is a seat structure member, 40a is a valve body support part, 43 is a solenoid connection member, 44 is a flange part, 45 is a fitting part, 46 is a fitting part, 47 is a spring, 48 is a spring receiver, 49 is a flange part, 50 is a case, 51 is a hollow portion, 52 and 53 are thin-walled portions, 54 is a caulking portion, 55 is a fixed magnetic pole, 56 and 57 are large-diameter portions, 58 and 59 are small-diameter portions, 60 is a shaft, 61 is a communication space, 62 is an air gap, 63 is a sleeve, 64 is a movable magnetic pole, 5 is a hollow portion, 66 is a convex portion, 67 is a pressure adjustment space, 68 is an end cap, 69 is a through hole, 70 is a rubber bush, 71 a and 71 b are lead wires, 72 is a bobbin, 73 is a coil, and 74 is a pressure adjustment Spaces 75, 76, 77 and 78 are O-rings. FIG. 2 is a partially enlarged cross-sectional view of the valve body of the solenoid valve according to the first embodiment of the present invention and its peripheral part, where (a) shows a non-energized state and (b) shows a conductive state. . In FIG. 2, 35 is a solenoid fitting hollow part, 39a and 39b are openings, 41 is a spacer, 42 is a fitting part, 42a is a caulking part, and other reference numerals are the same as those in FIG. The arrows in FIGS. 1 and 2 schematically describe the flow of oil.

  The solenoid valve 10 according to each embodiment of the present invention is a valve having bidirectionality with respect to the oil passage to be connected. In the following description, for the sake of convenience, the first oil passage side communication passage 31 is an upstream oil passage and the second oil passage side communication passage 34 is a downstream oil passage, but the first oil passage side communication passage 31 is downstream. Even when the oil passage and the second oil passage side communication passage 34 are the upstream oil passage, they function in exactly the same way, and are extremely suitable for tilt cylinders of forklifts that require the mast to be tilted in both the front and rear directions. .

  An overview of the solenoid valve 10 according to the first embodiment of the present invention will be described. The solenoid valve 10 is a flow rate control valve, and is mainly used for a tilt cylinder of a forklift, but it can also be used for other devices that require switching between a flow rate and a direction in which oil flows. FIG. 1A shows a state in which the coil 73 is not energized and the movable magnetic pole 64 is not attracted to the fixed magnetic pole 55. On the other hand, in FIG. 1B, when the coil 73 is energized, the movable magnetic pole 64 is attracted to the fixed magnetic pole 55, and the movable magnetic pole 64 is attracted to slide the shaft 60. Is shown, and the valve body 20 is in contact with the valve seat portion 36 of the seat structure member 40. The solenoid valve 10 includes a communication path component 11 and a solenoid component 12, and is integrated by fitting the solenoid connection member 43 into the hollow portion of the communication path component 30. When the coil 73 is not energized, the oil passes through the gap between the valve body 20 and the valve seat portion 36 from the first oil passage side communication passage 31 of the communication passage constituting member 30 as shown in FIG. The fluid flows to the second oil passage side communication passage 34 through the openings 39a and 39b and the annular communication passage 33. At the same time, there also exists a communication passage that flows from the first oil passage side communication passage 31 into the hollow portion 25 of the valve body 20 and exits from the through holes 26a and 26b to the openings 39a and 39b and flows to the second oil passage side communication passage 34. And some flow through this path. When the coil 73 is energized, as shown in FIG. 2B, the oil flows from the first oil passage side communication passage 31 into the hollow portion 25 of the valve body 20, and from the through holes 26a and 26b, the opening 39a and Since it flows to 39b and flows into the second oil passage side communication passage 34, the flow rate is reduced and the operating speed of a tilt cylinder (not shown) is lowered.

  Further, the shape and the like of each component will be described in detail. FIG. 3 is a view showing the valve body of the electromagnetic valve according to the first embodiment of the present invention, in which (a) is a plan view, (b) is a side view, and (c) is a cross-sectional view. In FIG. 3, 21 is a body portion, 22 is a medium diameter portion, 22a is an inclined portion, 23 is a small diameter portion, 24 is a flange portion, 25a is a large diameter portion, 25b is a small diameter portion, 27 is a through hole, and 28 is a corner portion. The other reference numerals are the same as those in FIG.

As shown in FIGS. 3A and 3B, the valve body 20 has a main body portion 21 formed in a bottomed cylindrical shape, and is open to the first oil passage side communication passage 31 side. An intermediate diameter portion 22, an inclined portion 22a, a small diameter portion 23, and a flange portion 24 are formed in this order on the opposite side of the opening of the main body portion 21, that is, on the solenoid component 12 side shown in FIG. The hollow portion 25 of the main body portion 21 includes a large diameter portion 25a on the first oil passage side communication passage 31 side and a small diameter portion 25b continuous with the large diameter portion 25a. The large-diameter portion 25 a serves as an oil communication path regardless of whether the coil 73 is energized or not. Through holes 26 a and 26 b are formed in the peripheral side surface of the main body portion 21. The through hole 26a and the through hole 26b face the opening 39a and the opening 39b shown in FIG. 2, respectively, and the flow of oil flowing into the large diameter portion 25a from the first oil passage side communication passage 31 side. Become an exit. The through holes 26a and 26b are formed so as to be sufficiently smaller than the flow path area between the valve body 20 and the valve seat portion 36 when the valve body 20 is separated from the valve seat portion 36. ing. Specifically, when the valve body 20 is in contact with the valve seat portion 36, the volume flow per unit time of the oil flowing through the through holes 26 a and 26 b is separated from the valve seat portion 36. The flow of oil between the valve body 20 and the valve seat portion 36 and the oil flowing through the through holes 26a and 26b are sufficiently smaller than the quantity flow per unit time, and the operation speed of the tilt cylinder is predetermined. It can be reduced to the point. Further, when the valve body 20 is in contact with the valve seat portion 36, a certain amount of oil flows, so that a spring having a smaller elastic force than an electromagnetic valve having a structure that completely cuts off the oil flow can be used. The size does not hinder downsizing.

  The small diameter portion 25b extends from the main body portion 21 to the vicinity of the middle of the medium diameter portion 22, and a through hole 27 is formed on the tip side. The through hole 27 is open on the peripheral side surface of the medium diameter portion 22, and together with the large diameter portion 25 a and the small diameter portion 25 b, the large diameter portion 57 that is the hollow portion shown in FIG. 2 and the first oil passage side communication passage 31. And communicate with. Further, the corner portion 28 of the main body portion 21 comes into contact with the seat surface 37 of the valve seat portion 36 shown in FIG. 2 to close the first oil passage side communication passage 31 and the openings 39a and 39b. It can be said that it is the core part of the body. The corner portion 28 is formed so as to have an annular outline as a whole, and is in close contact with the sheet surface 37. Moreover, it can be said that it is an easy shape etc. also for cutting. Accordingly, the main body 21 has an outer shape close to a spool valve, like the movable magnetic pole 82 in the prior art shown in FIG. 5, but is different from the prior art in that it can be closed without leakage.

  The medium diameter portion 22, the inclined portion 22 a, and the small diameter portion 23 are portions that are inserted into the spring 47 shown in FIG. 2 and support the spring 47. The medium diameter portion 22, the inclined portion 22 a and the small diameter portion 23 also have a function of exerting a pressing force from the shaft 60 applied to the flange portion 24 on the main body portion 21. Further, the small diameter portion 23 is formed to have a predetermined diameter so that the large diameter portion 57 which is a space for adjusting the differential pressure with the first oil passage (not shown) has a required volume. In addition, the small-diameter portion 23 is also a portion to which a C-ring shaped spring receiver 48 is attached. The flange portion 24 is a portion that locks the spring receiver 48 and is also a portion that contacts the shaft 60. The relative diameters of the medium diameter part 22, the inclined part 22a, and the small diameter part 23 with respect to the main body part 21 can be appropriately changed according to the configuration of the peripheral part. Further, for example, when the movable magnetic pole is configured to be in direct contact with the spring and the movable magnetic pole is directly pressed by the spring force of the spring, the medium diameter portion 22, the inclined portion 22 a, the small diameter portion 23, and the flange portion 24. It is possible to omit part or all of it.

  The description will be continued with reference to FIG. The communication passage constituting member 30 is a member that becomes a base of the communication passage constituting portion 11, and the first oil passage side communication passage 31 and the valve seat member fitting hollow portion are seen in the inside from the upstream side (not shown). 32, the annular communication passage 33 and the solenoid fitting hollow portion 35 are formed in this order. Further, a second oil passage side communication passage 34 is branched from the annular communication passage 33. The first oil passage side communication passage 31 is connected to a first oil passage (not shown). The valve seat member fitting hollow portion 32 is formed to have a diameter suitable for fitting the valve seat portion 36, and further becomes a part of the first oil passage side communication passage. The annular communication path 33 is connected to the second oil path side communication path 34 by providing a space having a predetermined volume as an oil path around the peripheral side surface of the seat structure member 40, and the second oil path side communication path 34 constitutes a second oil passage side communication passage. The second oil passage side communication passage 34 is connected to an external second oil passage (not shown). The solenoid fitting hollow portion 35 opens to the opposite side to the first oil passage side communication passage 31 and is formed to fit the fitting portion 42 of the solenoid connecting member 43.

  The seat structure member 40 includes a valve seat portion 36 and a valve body support portion 40a. The valve seat portion 36 is fitted inside the valve seat member fitting hollow portion 32, and an O-ring 75 for preventing leakage is fitted into a groove that makes one round of the peripheral side surface. The seat surface 37 is formed to have an inverted truncated cone shape. As will be described later, since the contact portion of the valve body 20 is formed in an annular shape, the inverted frustoconical seat surface 37 can be brought into close contact with the valve body 20 to reliably prevent leakage. Moreover, since it is extremely easy to cut the metal base material so as to form an inverted truncated cone shape, there is an advantage that the processing cost can be suppressed. In addition, the valve seat portion 36 is formed with a valve seat hollow portion 38 that is a part of the upstream communication path. Therefore, the first oil passage side portion of the communication passage communicating the upstream oil and the downstream oil is constituted by the first oil passage side communication passage 31, the valve seat member fitting hollow portion 32, and the valve seat hollow portion 38. Has been. The valve body support portion 40a supports the valve body 20 in a slidable state in the hollow portion, and openings 39a and 39b serving as oil passages are formed between the valve seat portion 36 and the valve body support portion 40a. ing. Further, a screw is cut on a peripheral side surface on the proximal end side of the valve body support portion 40a, and is screwed into the solenoid connection member 43. Further, the valve body support portion 40a is caulked by a caulking portion 42a of the solenoid connection member 43 to thereby generate a solenoid. It is fixed to the connecting member 43. The spacer 41 is provided in a state of being inserted into the opening on the solenoid component 12 side of the hollow portion of the valve body support portion 40a, and receives the end of the spring 47 on the communication path component 11 side.

  In the solenoid connecting member 43, the fitting portion 42 is fitted into the solenoid fitting hollow portion 35 of the communication path constituting member 30, and the fitting portion 45 is fitted to the thin portion 52 of the case 50 as shown in FIG. Has been. Further, as shown in FIG. 2, a caulking portion 42a is formed on the distal end side of the fitting portion 42, and the valve body support portion 40a is fixed by caulking. Further, an O-ring 76 is provided between the peripheral side surface on the proximal end side of the fitting portion 42 and the solenoid fitting hollow portion 35 to prevent leakage. A flange portion 44 for setting the fitting portion 42 is provided between the fitting portion 42 and the fitting portion 45. The spring 47 is provided inside the large diameter portion 57 of the fixed magnetic pole 55 in a state of being compressed by the spacer 41 and the spring receiver 48. In addition, when the movable magnetic pole 64 is attracted to the fixed magnetic pole 55 by energizing the coil 73, the repulsive force necessary to return the movable magnetic pole 64 to the original position when the energization to the coil 73 is stopped. Have. Further, as described above, the spring 47 can be easily accommodated in the large-diameter portion 57 having a relatively small volume because a spring having a smaller elastic force than an electromagnetic valve having a structure that completely cuts off the oil flow can be used.

  The description will be continued with reference to FIG. The spring receiver 48 is formed in a C-ring shape and is attached to the small diameter portion 23. Further, the flange portion 49 of the spring receiver 48 is constantly pressed toward the shaft 60 by the elastic force of the spring 47. The fixed magnetic pole 55 is provided inside the case 50 and is formed in a substantially cylindrical shape as a whole. The large-diameter portion 56 on the communication path component 11 side is fitted in the hollow portion of the solenoid connection member 43, and an O-ring 76 is provided on the circumferential side surface of the groove around the circumferential side surface. To prevent leakage. The large-diameter portion 57 that is a hollow portion of the large-diameter portion 56 is a space for adjusting the differential pressure, and is provided with a spring 47 and the like, and is continuous with the small-diameter portion 58 in addition. A shaft 60 is slidably inserted into a hollow portion that opens to the movable magnetic pole 64 side continuously to the small diameter portion 58. The shaft 60 has a circular cross section in a direction perpendicular to the central axis and has a rod shape. In addition, a communication space 61 for adjusting the differential pressure between the large-diameter portion 57 and the air gap 62 is formed on the peripheral side surface by cutting a part of the meat along the central axis. Yes. A sleeve 63 is fitted to the peripheral side surface of the small-diameter portion 59 on the movable magnetic pole 64 side, and an O-ring 78 is provided in a groove that goes around the peripheral side surface to prevent leakage.

  The movable magnetic pole 64 is slidably provided inside the sleeve 63, and an air gap 62 is generated between the movable magnetic pole 64 and the fixed magnetic pole 55 when the coil 73 is not energized. Further, a hollow portion 65 penetrates the movable magnetic pole 64 along the sliding direction so as to adjust the differential pressure between the pressure adjustment space 67 and the air gap 62. Further, a convex portion 66 is formed on the surface of the movable magnetic pole 64 on the pressure adjustment space 67 side, and the convex portion 66 prevents the movable magnetic pole 64 from sticking to the end cap 68. The coil 73 is wound around a bobbin 72, and a fixed magnetic pole 55 and a sleeve 63 are arranged inside the bobbin 72. In the case 50, the fitting portion 45 of the solenoid connection member 43 is fitted to the thin portion 52 which is the end portion on the communication path component 11 side, and the end cap 68 is attached to the thin portion 53 which is the opposite end portion. Is fitted. The end cap 68 is fixed to the case by a caulking portion 54 formed on the distal end side of the thin portion 53 of the case 50. Further, the inside of the protruding portion of the end cap 68 is a pressure adjustment space 67 for adjusting the differential pressure. The pressure adjustment space 67 also serves as a space for sliding the movable magnetic pole 64. A through hole 69 is formed around the protruding portion. The through hole 69 is for leading out the lead wires 71a and 71b connected to the coil 73 to the outside of the case 50, and a rubber bush 70 is inserted therein.

  As described above, in the solenoid valve 10 according to the first embodiment of the present invention, the valve body 20 is a part of the first oil path side of the communication path that communicates the upstream oil and the downstream oil. A hollow portion 25 formed so as to open to a certain valve seat hollow portion 38, one opening to the annular communication passage 33 which is the second oil passage of the communication passage, and the other opening to the hollow portion 25. The oil flow rate per unit time when the valve body is in contact with the valve seat is smaller than the oil flow rate per unit time when the valve body is separated from the valve seat. Since the through-holes 26a and 26b having such a diameter are provided, the solenoid component 12 having a short stroke length can be opened and closed, and downsizing is very easy. Further, it is not necessary to form another communication passage having a small passage area in the seat structure member 40 around the valve body 20, and the electromagnetic valve used for forklift tilt control can be easily reduced in size. In addition, the seat surface 37 forming the valve seat has an inverted frustoconical shape, the body portion 21 of the valve body 20 has a substantially cylindrical shape, and the corner portions 28 have an annular shape. It becomes simple and can be manufactured at low cost. Furthermore, since the large diameter part 25a of the hollow part 25 of the main body part 21 opens toward the valve seat hollow part 38, the structure of the hollow part 25 can be simplified and can be manufactured at low cost. In addition, since the peripheral side surface of the main body portion 21 of the valve body 20 faces the annular communication path 33 and the hollow portion 25 opens on the peripheral side surface of the main body portion 21, a bidirectional electromagnetic valve is simplified. It can be realized with a simple structure and can be manufactured at low cost. In addition, a spring having a smaller elastic force than an electromagnetic valve having a structure that completely cuts off the oil flow can be used. Further, the spring 47, the spacers 41 and 48, and the shaft 60 can be housed in a space having a small diameter between the valve body 20 and the movable magnetic pole 55, and the electromagnetic valve used for tilt control of the forklift can be reduced in size, particularly with a small diameter. Thus, it is possible to easily realize an elongated cylindrical shape.

  Furthermore, a solenoid valve according to a second embodiment of the present invention will be described. 4A and 4B are views showing a solenoid valve according to a second embodiment of the present invention, in which FIG. 4A is a plan view and FIG. 4B is a partially enlarged sectional view of a valve body and its peripheral part. In FIG. 4, 29 is an inclined surface, and other reference numerals are the same as those in FIG.

As shown in FIG. 4A, the solenoid valve 10 according to the second embodiment of the present invention has an inverted truncated conical end surface on the first oil passage side communication passage 31 side in the main body portion 21 of the valve body 10. It is characterized in that the inclined surface 29 is lightly inclined so as to form a shape. The configuration of the other parts is the same as that of the electromagnetic valve 10 according to the first embodiment of the present invention. By forming the valve body 10 in this way, as shown in FIG. 4B, the corner portion 28 of the valve body 10 is sharpened in an edge shape, so that the width of the contact portion with the seat surface 37 is narrowed, The occurrence of leakage can be prevented more reliably.

  In addition, this invention is not limited to the content demonstrated above, For example, in the communicating path component 30, the direction in which the 1st oil path side communicating path 31 or the 2nd oil path side communicating path 34 opens is different. Various modifications can be made without departing from the scope described in each claim.

DESCRIPTION OF SYMBOLS 10 Solenoid valve 11 Communication path component 12 Solenoid component 20 Valve body 21 Main part 22 Medium diameter part 22a Inclined part 23 Small diameter part 24 Flange part 25 Hollow part 25a Large diameter part 25b Small diameter part 26a Through hole 26b Through hole 27 Through hole 28 corner portion 29 inclined surface 30 communication passage constituting member 31 first oil passage side communication passage 32 valve seat member fitting hollow portion 33 annular communication passage 34 second oil passage side communication passage 35 solenoid fitting hollow portion 36 valve seat portion 37 Seat surface 38 Valve seat hollow portion 39a Opening portion 39b Opening portion 40 Seat structure member 40a Valve body support portion 41 Spacer 42 Fitting portion 42a Caulking portion 43 Solenoid connection member 44 Flange portion 45 Fitting portion 46 Fitting portion 47 Spring 48 Spring Receiving portion 49 Flange portion 50 Case 51 Hollow portion 52 Thin portion 53 Thin portion 54 Caulking portion 55 Fixed magnetic pole 56 Large diameter portion 57 Large diameter portion 58 Small diameter portion 59 Small diameter portion 60 Shaft 61 Communication space 62 Air gap 63 Sleeve 64 Movable magnetic pole 65 Hollow portion 66 Protruding portion 67 Pressure adjustment space 68 End cap 69 Through hole 70 Rubber bush 71a Lead wire 71b Lead wire 72 Bobbin 73 Coil 74 Pressure adjustment space 75 O-ring 76 O-ring 77 O-ring 78 O-ring 80 Spool 81 Spring 82 Plunger 82a Sliding hole 82b Land portion 83 First passage 84 Second passage 85 Groove 86 Spring chamber 87 Pilot passage 88 Tank passage 89 Drain hole

Claims (4)

A valve body, a communication passage connecting the first oil passage and the second oil passage, a valve body provided to be opened and closed by contacting and separating the communication passage to and from the valve seat, and the valve body And a movable magnetic pole provided so as to move the valve body in contact with and away from the valve seat by sliding along a central axis.
The valve seat is formed so that a portion that contacts the valve body and a surface in the vicinity thereof have an inverted truncated cone shape,
The valve body has a hollow portion formed so that a portion near the tip is formed in a bottomed cylindrical shape and opens to a portion on the first oil passage side of the communication path, and one of the valve bodies is the first part of the communication path. The oil flow rate per unit time when the valve body is in contact with the valve seat and the valve body is formed so that the other is open to the hollow portion and the other is open to the hollow portion. A through hole having a diameter that is smaller than the flow rate of oil per unit time when the body is separated from the valve seat, and a tip portion is in contact with and separated from the valve body, and the valve seat An electromagnetic valve comprising: a corner portion that is in contact with the seat surface and having an annular outline as a whole; and an end surface that is lightly inclined so as to form an inverted truncated cone shape .   2. The solenoid valve according to claim 1, wherein the valve body has the tip portion facing the first oil passage, and the hollow portion is open to the tip portion.   The valve body is characterized in that a peripheral side surface of the portion close to the tip end faces the second oil passage, and the hollow portion opens to the peripheral side surface close to the tip end portion. Item 3. The solenoid valve according to item 1 or 2. The valve body is formed such that a portion near the base end is smaller in diameter than a portion near the tip, and a step portion is formed between the portion near the base end and the portion near the tip. A flange portion formed on the end side ,
Further, a spacer that is inserted through the portion near the base end and provided so as to contact the stepped portion,
A spring provided so that one end thereof is in contact with the spacer;
A spring receiver provided to abut against the other end of the spring and locked to the flange ;
4. The shaft according to claim 1, further comprising: a shaft provided so that one end thereof is in contact with the flange portion and the other end is in contact with the movable magnetic pole. 5. solenoid valve.

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