JP2011185306A - Solenoid valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve device that improves efficiency, controllability, and manufacturability. <P>SOLUTION: The solenoid valve device 1 has: a needle 15 which includes an input port 2, an output port 3, and a valve element for closing at least either one of the input port 2 or output port 3; a stator 6 which includes a fitting part fitted to the needle 15 in an axial direction; a coil 5 which causes electromagnetic force to act on the needle 15 via the stator 6; and an elastic member 14 which causes thrust in an opposite direction of the electromagnetic force to act on the needle 15. Magnetic flux passing through between the needle 15 and the stator 6 increases in a radial direction of the needle with increase of relative fitting depth between the needle 15 and the stator 6. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electromagnetic valve configured to adjust a flow rate of a fluid by being operated by electromagnetic force.

  The fluid control device is provided with a flow path that is a fluid passage, and the pressure of a fluid pressure chamber or the like communicated therewith is adjusted. It is generally known that such control is performed by a configuration including a fluid valve such as a solenoid provided in the flow path. Patent Document 1 or Patent Document 2 describes a proportional solenoid or a compact constituent unit provided in the middle of such a fluid passage.

  In the proportional solenoid described in Patent Document 1, in the stroke-attraction force characteristic of the proportional solenoid, the control zone forming the horizontal characteristic portion H is composed of the control zone H1 and the auxiliary zone H2. When the stroke is smaller than the control zone, a rising portion L1 that descends with a steep slope appears, and when the control zone indicating the horizontal state is exceeded, a useless zone that falls with a steep slope appears. Since the spacer is formed thin and the fixed iron core and the nonmagnetic part are joined by the tapered surface, the rising part L of the rising part L1 can appear in the auxiliary zone H2. The suction force of the auxiliary zone can be increased from the suction force of the control zone. Thereby, in the proportional solenoid described in Patent Document 1, the suction force in the auxiliary zone is increased without increasing the physique.

  Further, the compact structural unit described in Patent Document 2 includes a casing in which the functional unit is inserted into the recess. The functional unit has a cover plate made of a thermoplastic material that closes the recess in a compact manner. Similarly, a gap is formed between the casing made of thermoplastic plastic and the cover plate, and an insertion member is inserted into this gap. With this insertion member, a tight connection between the casing and the cover plate can be realized. In this case, the consolidation is formed by ultrasonic welding, and the vibrator of the ultrasonic welding machine is attached to the insertion member. According to such a manufacturing method, it is not necessary for the vibrator necessary for welding to vibrate the mass of the functional unit, for example, the magnet of the electromagnetic actuating member, and welding can be performed by vibrating only a much smaller mass of the insertion member. .

JP 2004-218816 A Special Table 2000-517036

  As described above, in the proportional solenoid described in Patent Document 1, the thickness of the spacer is reduced, and the fixed iron core and the nonmagnetic portion are joined with a tapered surface, and the thickness and the angle of the tapered surface are set. By appropriately adjusting, the relationship between the suction force and the movable displacement can be made appropriate, or the suction force can be increased in each zone. However, in the configuration in which a spacer is provided between the movable iron core and the fixed iron core, or in the configuration in which the non-magnetic portion having the tapered surface is formed and the tapered surface is formed on the fixed iron core and these are joined, the number of parts increases. In addition, the processing frequency increases, and it is not possible to reduce the cost of parts or to facilitate manufacture.

  Further, the compact constituent unit described in Patent Document 2 has an advantage that a compact constituent unit can be easily manufactured. Further, although steps are provided at a plurality of positions in the axial direction on the outer periphery of the coil core, it does not particularly contribute to the behavior of the mover or the sphere (closing member) that is movable by the magnetic force from the solenoid. As described above, the configuration in which the shape of the mover of the solenoid valve, the fixed iron core, or the member joined thereto can be mutually deformed can improve the efficiency, controllability, and manufacturability of the solenoid valve. There was still room for improvement in order to obtain these effects with a simple structure.

  This invention pays attention to the technical problem mentioned above, and it aims at providing the solenoid valve which can improve efficiency, controllability, and manufacturability.

  In order to achieve the above object, the invention of claim 1 is directed to an input port, an output port, a movable element including a valve body that closes at least one of the input port and the output port, and a movable element thereof. A stator having a fitting portion that is fitted to the child in the axial direction; a coil that applies an electromagnetic force to the mover via the stator; and a thrust in a direction opposite to the electromagnetic force is movable. In an electromagnetic valve having an elastic member that acts on the child, the relative engagement depth between the mover and the stator increases, and the stator and the stator move in the radial direction of the mover. The magnetic flux passing between them is configured to increase.

  According to a second aspect of the present invention, in the first aspect of the present invention, a tip end side of the mover fitted to the stator and a tip end side of the stator fitted to the mover. Either one of the tip end side of the stator having a large inner diameter at the opening end and a small inner diameter at a position deeper than the opening end and fitted to the movable element of the stator On the other hand, the electromagnetic valve is characterized in that a convex portion having a small outer diameter at a tip portion fitted in the concave portion and a large outer diameter at a position retracted from the tip portion is formed.

  According to a third aspect of the present invention, in the second aspect of the present invention, the concave portion is formed in a shape that decreases in inner diameter in a stepped manner from the opening end side, and the convex portion has an outer diameter in a stepped shape from the distal end side. It is an electromagnetic valve characterized by being formed in a shape that increases.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, an annular groove with an increasing or decreasing inner diameter is formed on the inner peripheral surface of the concave portion, and an outer diameter is increased or decreased on the outer peripheral surface of the convex portion. The electromagnetic valve is characterized in that an annular groove is formed.

  According to the first aspect of the present invention, the magnetic flux passing between the mover and the stator in the radial direction of the mover increases as the relative fitting depth between the mover and the stator increases. Since it is comprised, when the needle | mover is attracted | sucked to the stator side, the magnetic force which acts on the movable direction of a needle | mover can be suppressed and the controllability of an electromagnetic valve can be improved. Further, since the magnetic force acting in the moving direction of the mover is suppressed, an elastic member having a small thrust can be used, and the consumption of electric power for moving the electromagnetic valve is suppressed.

  According to the invention of claim 2, the concave portion and the convex portion are configured to be fitted, and the magnetic flux acting between the concave portion and the convex portion acts in the movable direction of the movable element and the movable element Since it also acts in the radial direction, the controllability of the solenoid valve can be improved by suppressing the magnetic force acting in the movable direction of the mover when the mover is attracted to the stator side. Further, since the magnetic force acting in the moving direction of the mover is suppressed, an elastic member having a small thrust can be used, and the consumption of electric power for moving the electromagnetic valve is suppressed.

  Furthermore, according to the invention of claim 3, the concave portion is formed in a stepped shape from the opening end side in a stepped shape, and the convex portion is formed in a stepped shape from the tip side in a stepped shape. It is formed and acts in the moving direction of the mover as well as in the radial direction of the mover, so that the magnetic force acting in the moving direction of the mover when the mover is attracted to the stator side is suppressed. Therefore, the controllability of the solenoid valve can be improved. Further, since the magnetic force acting in the moving direction of the mover is suppressed, an elastic member having a small thrust can be used, and the consumption of electric power for moving the electromagnetic valve is suppressed.

  According to the invention of claim 4, an annular groove with an increasing or decreasing inner diameter is formed on the inner peripheral surface of the concave portion, and another annular groove with an outer diameter increasing or decreasing is formed on the outer peripheral surface of the convex portion. Since it acts in the moving direction of the mover and also in the radial direction of the mover, it suppresses or adjusts the magnetic force acting in the moving direction of the mover when the mover is attracted to the stator side. Therefore, the controllability of the solenoid valve can be improved. In addition, since the magnetic force acting in the moving direction of the mover is suppressed or adjusted, an elastic member having a small thrust can be used, and consumption of electric power for moving the electromagnetic valve is suppressed.

It is a schematic diagram which shows 1st Example of the solenoid valve which concerns on this invention. It is a schematic diagram which shows 2nd Example of the solenoid valve which concerns on this invention. It is a diagram which shows the change of the fitting area in 1st Example of the solenoid valve which concerns on this invention. It is a diagram which shows the change of the fitting area in 2nd Example of the solenoid valve which concerns on this invention. It is the diagram which compared the attraction | suction characteristic of 1st Example and 2nd Example of the solenoid valve which concerns on this invention. It is a schematic diagram which shows 3rd Example of the solenoid valve which concerns on this invention. It is a schematic diagram which shows 4th Example of the solenoid valve which concerns on this invention. It is a schematic diagram which shows 5th Example of the solenoid valve which concerns on this invention. It is a schematic diagram which shows the other structural example of the groove | channel in 3rd Example of the solenoid valve which concerns on this invention. It is a schematic diagram which shows the further another structural example of the groove | channel in 3rd Example of the solenoid valve which concerns on this invention.

  Next, the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of an electromagnetic valve according to the present invention. The electromagnetic valve 1 can be applied to a hydraulic device such as a construction machine or an injection molding machine, or a device that performs pressure control, flow rate control, and direction switching such as control of a continuously variable transmission of a vehicle. The solenoid valve 1 is a proportional solenoid capable of arbitrarily controlling the position of a plunger 15 (to be described later) with a characteristic obtained by a spring 14 (to be described later) added to a magnetic pole shape.

  The solenoid valve 1 includes an input port 2 and an output port 3. The input port 2 communicates with a flow path (not shown) connected to a fluid pump or the like that uses the rotational force of the engine as a power source. The output port 3 communicates with a flow path (not shown) connected to, for example, a fluid pressure chamber that performs shift control of the continuously variable transmission. By adjusting the flow rate by the electromagnetic valve 1, the amount of fluid supplied to the fluid pressure chamber is adjusted, and, for example, shift control or clamping control of a continuously variable transmission is performed. The input port 2 and the output port 3 are configured by forming holes in the casing 4 of the electromagnetic valve 1.

  In the casing 4, an input port 2 and an output port 3 are formed on one side, and a coil (solenoid) 5 is accommodated on the other side. The coil 5 is provided together with the iron core 6 in a storage chamber formed in the casing 4. The coil 5 is connected by a lead wire (not shown) or the like to a power supply device (not shown) capable of controlling the power supply state so that power is supplied. The iron core 6 is provided together with the casing 4 and is made of a magnetic material such as iron. The casing 4 is provided with a passage 7 that is a space that allows the input port 2 and the output port 3 to communicate with each other. A valve seat 8 that seals the input port 2 is formed on the side of the passage 7 of the input port 2 by a valve body 16 to be described later. Further, a bottomed cylindrical recess 9 is formed in the casing 4 or the iron core 6 on the opposite side of the passage 7 from the input port 2. In addition, the recessed part 9 is equivalent to the fitting part of this invention.

  The recess 9 has a cylindrical portion 10 with a predetermined dimension that is formed in a cylindrical shape with a constant inner diameter in the depth direction (left side in the left-right direction in FIG. 1) according to the application of the solenoid valve 1 or the like. is doing. Moreover, the cylindrical nonmagnetic part 11 is provided in the recessed part 9 in which the internal diameter was formed in the cylinder shape to the depth direction of the recessed part 9 uniformly. The nonmagnetic portion 11 has a cylindrical shape with a constant inner diameter in the depth direction of the concave portion 9 and is flush with the concave portion 9. The material of the nonmagnetic part 11 is made of a nonmagnetic material such as brass. Furthermore, a stepped portion 12 of the recess 9 is provided in a stepped manner at the end of the recess 9 of the nonmagnetic portion 11 in the depth direction.

  The stepped portion 12 is formed in a cylindrical shape with a constant inner diameter in the depth direction of the recess 9 and is flush with the nonmagnetic portion 11, and the inner diameter is gradually increased in the depth direction of the recess 9. It is made small and formed in a plurality of places. The step of the step portion 12 has a predetermined inner diameter set according to the use of the electromagnetic valve 1 and the like, and is provided at three places as an example. In FIG. 1, there are only three steps of the stepped portion 12, but the number of steps may be further increased or decreased.

  Further, in the bottomed cylindrical concave portion 9 formed in the casing 4 or the iron core 6, a cylindrical spring accommodating portion 13 that shares the bottom of the concave portion 9 is provided in the depth direction of the concave portion 9 of the stepped portion 12. It has been. In the spring accommodating portion 13, an elastic member 14, that is, a spring 14 provided as an example in the embodiment, is provided in contact with the bottom portion of the recess 9. The spring 14 is configured to expand and contract in the depth direction of the concave portion 9 to apply thrust to the bottom portion of the plunger 15 described later.

  On the opposite side of the portion where the spring 14 is in contact with the bottom of the recess 9, a plunger 15 is provided in contact. The portion where the spring 14 and the plunger 15 are in contact with each other may be connected to each other or may be configured so as not to be fixed only by contact. The plunger 15 is fitted to the concave portion 9, the nonmagnetic portion 11 and the spring accommodating portion 13, and is provided so as to be movable in the depth direction of the concave portion 9. The shape of the plunger 15 is movable in the depth direction of the recess 9, and the outer diameter is substantially the same as the inner diameter of the recess 9, that is, the cylindrical portion 10, the nonmagnetic portion 11, the step portion 12 and the spring accommodating portion 13. Is formed. The plunger 15 has a valve body 16 that abuts against a valve seat 8 formed together with the input port 2 of the casing 4 and seals the input port 2. The valve body 16 is integrally formed on the end surface of the shaft-shaped portion 17 that fits into the tubular portion 10 on the passage 7 side of the concave portion 9 in the plunger 15. The valve body 16 is formed with a valve seat 8 together with the output port 3 of the casing 4, and the position of the valve body 16 in the plunger 15 is changed, and the valve body 16 abuts on the valve seat 8 of the output port 3 to output the valve body 16. The port 3 may be sealed. The shaft-like portion 17 of the plunger 15 is fitted into the recess 9 on the side of the passage 7, that is, the tubular portion 10 and the nonmagnetic portion 11, and the depth direction of the recess 9 depends on the dimensions of the tubular portion 10 of the recess 9. The length of is set.

  Further, the plunger 15 is further formed with a stepped portion 18 in a step shape from the end portion of the shaft-shaped portion 17 in the depth direction of the recessed portion 9. The stepped portion 18 is formed such that the outer diameter decreases stepwise as it goes in the depth direction of the recessed portion 9. The step of the step portion 18 has a predetermined inner diameter set according to the application of the solenoid valve 1 and the like, and is provided at three places as an example. In FIG. 1, there are only three steps of the stepped portion 18 of the plunger 15, but the number of steps may be further increased or decreased, and the points may be provided at a plurality of locations. Further, the plunger 15 corresponds to the protrusion in the present invention.

  As described above, the step portion 12 of the recess 9 and the step portion 18 of the plunger 15 are provided, and the positional relationship between the step portion 12 and the step portion 18 is configured as follows in this first embodiment. . As shown in FIG. 1, the outer peripheral surfaces of the three steps of the step portion 12 of the recess 9 are sequentially arranged in the depth direction of the recess 9 in the first fitting portion 12a, the second fitting portion 12b, and the third fitting portion 12c. And Further, as shown in FIG. 1, the outer peripheral surfaces of the three step portions of the step portion 18 of the plunger 15 are sequentially arranged in the depth direction of the concave portion 9 in the first fitting portion 18a, the second fitting portion 18b, and the third fitting portion. Let it be a portion 18c. As shown in FIG. 1, the three opposing steps in the depth direction of the recess 9 are sequentially arranged in the depth direction of the recess 9 between the three steps of the step 12 of the recess 9 and the three steps of the step 18 of the plunger 15. The first facing portion 12d, the second facing portion 12e, the third facing portion 12f of the stepped portion 12, and the first facing portion 18d, the second facing portion 18e, and the third facing portion 18f of the stepped portion 18.

  In the electromagnetic valve 1 of the first embodiment, the first fitting portion 12a and the first fitting portion 18a are set to the same length in the depth direction of the concave portion 9, and the second fitting portion 12b and the second fitting portion are set. The joint portion 18 b is set to the same length in the depth direction of the recess 9, and the third fitting portion 12 c and the third fitting portion 18 c are set to the same length in the depth direction of the recess 9. In addition, the innermost circumference diameter and the outermost circumference diameter of the first facing portion 12d and the first facing portion 18d are set to the same dimension, and the innermost circumference of the second facing portion 12e and the second facing portion 18e. The side diameter and the outermost diameter are set to the same size, and the innermost diameter and the outermost diameter of the third facing portion 12f and the third facing portion 18f are set to the same size. The dimensions of the fitting portions 12a, 12b, 12c, 18a, 18b, 18c and the facing portions 12d, 12e, 12f, 18d, 18e, 18f are such that the plunger 15 is in the recess 9 and the depth direction of the recess 9 is as follows. It is configured to be movable. Then, at the position where the valve body 16 of the plunger 15 contacts the valve seat 8 and seals the input port 2, the end surface of the step portion 12 connected to the end portion in the depth direction of the recess 9 of the nonmagnetic portion 11 The first facing portion 18d is flush with the first facing portion 12d and the second facing portion 18e are flush with each other, the second facing portion 12e and the third facing portion 18f are flush with each other, and the third facing portion 12f. And the bottom of the plunger 15 are flush with each other. That is, each fitting part 12a, 12b, 12c of the level | step-difference part 12 which faces each other and each fitting part 18a, 18b, 18c of the level | step-difference part 18 become a structure located without overlapping.

  In the electromagnetic valve 1 of the first embodiment configured as described above, the coil 5 is energized from the state in which the valve body 16 of the plunger 15 contacts the valve seat 8 and the input port 2 is sealed. Due to this, electromagnetic force acts, the plunger 15 is drawn into the recess 9, the valve body 16 of the plunger 15 is separated from the valve seat 8, and the input port 2 is gradually opened. That is, when the coil 5 is energized, a magnetic field corresponding to the current is generated, and the action is exerted on the iron core 6 and the plunger 15 provided in the casing 4. At this time, the action of the magnetic field by the coil 5 is represented by a magnetic flux line connected to or passing from the iron core 6 to the plunger 15. The concave portion 9 is provided in the iron core 6, and a magnetic flux is connected from the step portion 12 of the concave portion 9 to the step portion 18 of the plunger 15, and an attractive force (electromagnetic force) acts on the magnetic flux direction in the direction of the magnetic flux. .

  This suction force is a pressure applied by the fluid flowing in from the input port 2 to push the valve body 16 and is reduced by the thrust of the spring 14 with respect to the direction of the force of the suction force. Since the solenoid valve 1 is a proportional solenoid, the flow rate of the fluid flowing from the input port 2 to the output port 3 can be adjusted by the position where the plunger 15 moves in the recess 9 (hereinafter referred to as a movable position). . Therefore, it is desirable for control that the suction force is uniform regardless of the movable position of the plunger 15. In this invention, the action of the magnetic field by the coil 5 is connected to the stepped portion 18 of the plunger 15 from the stepped portion 12 of the recessed portion 9, or the passing magnetic flux acts in the depth direction of the recessed portion 9, and the stepped portion 12 of the recessed portion 9. And the step portion 18 of the plunger 15, a magnetic field is applied from the first fitting portion 12 a to the first fitting portion 18 a, and a magnetic field is applied from the second fitting portion 12 b to the second fitting portion 18 b, A magnetic field is applied from the third fitting portion 12c to the third fitting portion 18c. That is, if the stepped portion 12 of the concave portion 9 and the stepped portion 18 of the plunger 15 are not provided, the stepped portion 12 of the concaved portion 9 and the stepped portion 12 of the concaved portion 9 are changed from the state in which the action of the force due to the magnetic field substantially works only in the depth direction. By providing the step portion 18 of the plunger 15, the force due to the magnetic field that substantially acts only in the depth direction of the concave portion 9 is applied to the outer peripheral side in the radial direction of the plunger 15, and the concave portion 9 and the plunger 15 approach each other. The strength of the magnetic field that gradually increases with time is weakened.

  That is, the magnetic flux in which the action of the magnetic field by the coil 5 is connected from the step portion 12 of the concave portion 9 to the step portion 18 of the plunger 15 acts on both the depth direction of the concave portion 9 and the outer peripheral side in the radial direction of the plunger 15. 9 inclines with respect to the depth direction of 9, and the force which a magnetic field acts on the outer peripheral side of the plunger 15 in the radial direction is released. Since the force acts on the plunger 15 from the recess 9 as described above, the action of the force due to the magnetic field gradually weakens as the plunger 15 approaches the recess 9.

  In the solenoid valve 1 according to the first embodiment configured as described above, when the plunger 15 is sucked in the depth direction of the concave portion 9 formed in the iron core 6, the stroke, that is, the concave portion 9 of the plunger 15 and the iron core 6, The controllability of the solenoid valve 1 can be improved by suppressing an increase in attractive force due to the narrow gap in the axial direction. In addition, since an increase in attractive force due to the magnetic field acting from the coil 5 can be suppressed, the thrust of the spring 14 can be reduced, so that power consumption for moving the solenoid valve 1 is suppressed. Further, the step portion 12 is provided in the concave portion 9 formed in the iron core 6 and the step portion 18 is provided in the plunger 15 to obtain the above-described effects of improving controllability and power saving with a simple configuration. Manufacturability is improved.

  Next, a second embodiment of the electromagnetic valve according to the present invention will be described with reference to the drawings. FIG. 2 shows a second embodiment of the electromagnetic valve according to the present invention. Similar to the first embodiment, the solenoid valve 20 can be applied to a hydraulic device such as a construction machine or an injection molding machine, or a device that performs pressure control such as control of a continuously variable transmission of a vehicle, flow rate control, and direction switching. . The solenoid valve 20 is a proportional solenoid capable of arbitrarily controlling the position of a plunger 23 (to be described later) with a characteristic obtained by a spring 14 (to be described later) added to a magnetic pole shape, as in the first embodiment. is there. Hereinafter, the electromagnetic valve 20 will be described, and the same configurations as those of the first embodiment will be denoted by the same reference numerals as those of the first embodiment, and description thereof will be omitted.

  The electromagnetic valve 20 of the second embodiment is different from the electromagnetic valve 1 described in the first embodiment in the depth of the concave portion 9 between the step portion 12 formed in the concave portion 9 and the step portion 18 provided in the plunger 15. The positional relationship in the direction is different. That is, in the electromagnetic valve 1, the step connected to the end in the depth direction of the recess 9 of the nonmagnetic portion 11 at the position where the valve body 16 of the plunger 15 contacts the valve seat 8 to seal the input port 2. The end surface of the portion 22 and the first facing portion 18d are flush with each other, the first facing portion 12d and the second facing portion 18e are flush with each other, the second facing portion 12e and the third facing portion 18f are flush with each other, The third opposing portion 12f and the bottom portion of the plunger 15 are flush with each other, but in the electromagnetic valve 20, a gap is provided in each opposing portion at a position where the valve body 16 contacts the valve seat 8. It has a configuration.

  Specifically, in the electromagnetic valve 20 of the second embodiment, a stepped portion 22 formed in a stepped shape in the recess 21 and a stepped portion 24 and a shaft-shaped portion 25 formed in a stepped shape in the plunger 23 are provided. It has been. The recess 21 corresponds to the fitting portion of the present invention. In the stepped portion 22, the stepped portion 24, and the shaft-like portion 25, the dimension of the recess 21 in the depth direction is set, and a gap is provided in each facing portion. In the second embodiment, the depth dimension of the recess 21 is changed in the step 24 and the shaft 25 formed in the plunger 23 while the configuration of the step 22 formed in the recess 21 is left as it is. Yes. In addition, in order to provide a gap in each facing portion, the depth direction dimension of the recess 21 may be changed in the step portion 22 formed in the recess 21.

  In the electromagnetic valve 20 of the second embodiment, the positional relationship between the step portion 22 of the recess 21 and the step portion 24 of the plunger 23 is configured as follows in the second embodiment. As shown in FIG. 2, the outer peripheral surfaces of the three steps of the stepped portion 22 of the recessed portion 21 are sequentially arranged in the depth direction of the recessed portion 21 in the first fitting portion 22a, the second fitting portion 22b, and the third fitting portion 22c. And Further, the outer peripheral surfaces of the three step portions of the step portion 24 of the plunger 23 are sequentially arranged in the depth direction of the concave portion 21 as shown in FIG. 2 in order of the first fitting portion 24a, the second fitting portion 24b, and the third fitting portion. Let it be a portion 24c. As shown in FIG. 2, the surfaces facing the three steps of the step portion 22 of the recess 21 and the three steps of the step portion 24 of the plunger 23 in the depth direction of the recess 21 are sequentially arranged in the depth direction of the recess 21. The first facing portion 22d, the second facing portion 22e, the third facing portion 22f of the step portion 22, and the first facing portion 24d, the second facing portion 24e, and the third facing portion 24f of the stepped portion 24 are defined.

  In the shaft-like portion 25 formed on the plunger 23, the end surface of the step portion 22 connected to the end portion in the depth direction of the recess portion 9 of the nonmagnetic portion 11 is shortened in the depth direction of the recess portion 21. . Accordingly, a gap is provided between the end surface of the step portion 22 connected to the depth direction end of the recess 9 of the nonmagnetic portion 11 and the first facing portion 22 d of the step portion 22 in the depth direction of the recess 21. It has become. Further, the first fitting portion 24a of the step portion 24 has a length in the depth direction of the concave portion 21 shortened. Therefore, the first facing portion 22 d of the stepped portion 22 and the second facing portion 24 e of the stepped portion 24 are configured such that a gap is provided in the depth direction of the recessed portion 21. Further, the second fitting portion 24b of the step portion 24 has a length in the depth direction of the concave portion 21 shortened. Therefore, the second facing portion 22e of the stepped portion 22 and the third facing portion 24f of the stepped portion 24 are configured such that a gap is provided in the depth direction of the recessed portion 21.

  The gaps thus provided are strokes when the lengths of the recesses 21 of the fitting portions 24 a, 24 b, 24 c provided in the plunger 23 are adjusted in the depth direction, and the plunger 23 is pulled into the recess 21. That is, the dimension is set so that the suction force is as constant as possible by suppressing an increase in the suction force due to the narrow gap in the axial direction between the plunger 23 and the recess 21 of the iron core 6. The other parts of the electromagnetic valve 20 of the second embodiment have the same configuration as that of the electromagnetic valve 1 of the first embodiment.

  Since the solenoid valve 20 of the second embodiment configured as described above is a proportional solenoid, the position from which the plunger 23 moves in the recess 21 (hereinafter referred to as a movable position) is changed from the input port 2 to the output port 3. The flow rate of the flowing fluid can be adjusted. Therefore, it is desirable for the control that the suction force is uniform regardless of the movable position of the plunger 23. In the electromagnetic valve 20 of the second embodiment, the magnetic field action by the coil 5 is connected to the stepped portion 24 of the plunger 23 from the stepped portion 22 of the recessed portion 21 or the passing magnetic flux is applied in the depth direction of the recessed portion 21. In the step portion 22 of the recess 21 and the step portion 24 of the plunger 23, a magnetic field is applied from the first fitting portion 22a to the first fitting portion 24a, and the second fitting portion 22b to the second fitting portion 24b. And a magnetic field is applied from the third fitting portion 22c to the third fitting portion 24c. Therefore, in addition to the action obtained by the electromagnetic valve 1 of the first embodiment, since the gaps are further provided as described above, the force due to the magnetic field acting almost only in the depth direction of the recess 9 is applied to the step part 22. , 24 are provided so as to act on the outer peripheral side of the plunger 15 in the radial direction, the suction force is relatively uniform regardless of the movable position of the plunger 23 by adjusting the respective gaps.

  FIG. 3 shows the relationship between the fitting area between the stepped portion 12 of the recess 9 and the stepped portion 18 of the plunger 15 and the movable position of the plunger 15 in the electromagnetic valve 1 of the first embodiment of the present invention. The electromagnetic valve 1 is configured such that the stepped portions 12 and 18 are uniformly formed, that is, each gap is not provided. Therefore, the total sum of the fitting areas of the steps changes on the average with respect to the movable position of the plunger 15. On the other hand, in the solenoid valve 20 of the second embodiment, as shown in FIG. 4, each gap is provided so that the fitting area by each step is different. The total sum can be changed with respect to the movable position of the plunger 15.

  Therefore, for example, as shown in FIG. 5, by adjusting each gap, the suction force can be made more uniform relative to the first embodiment regardless of the movable position of the plunger 23. That is, the magnetic flux in which the action of the magnetic field by the coil 5 is connected to the stepped portion 24 of the plunger 23 from the stepped portion 22 of the recessed portion 21 acts on both the depth direction of the recessed portion 21 and the outer peripheral side in the radial direction of the plunger 23. When acting with an inclination with respect to the depth direction of 21, the strength of the magnetic field acting on both the outer peripheral side of the plunger 23 in the radial direction is related to the sum of the fitting areas. The degree to which the force acting on the magnetic field is allowed to escape on the radially outer peripheral side of the plunger 15 can be adjusted by adjusting the gap between the fitting areas. Since the force acts on the plunger 23 from the recess 21 as described above, the degree of the action of the force by the magnetic field gradually weakening as the plunger 23 approaches the recess 21 can be adjusted.

  In the electromagnetic valve 20 of the second embodiment configured as described above, an increase in suction force due to a narrow stroke when the plunger 23 is sucked in the depth direction of the recess 9 formed in the iron core 6. The controllability of the electromagnetic valve 20 can be improved by suppressing the above. Moreover, since the increase of the attractive force (electromagnetic force) due to the magnetic field acting from the coil 5 can be suppressed and the thrust of the spring 14 can be reduced, the power consumption for moving the electromagnetic valve 20 is suppressed. Furthermore, the change of the suction force in the stroke range of the plunger 23 can be adjusted by changing the size of the overlapping portion. Further, the step portion 22 is provided in the concave portion 21 formed in the iron core 6, and the step portion 24 is provided in the plunger 15, and the effects such as the above-described improvement in controllability and power saving are obtained with a simple configuration. Therefore, manufacturability is improved.

  FIG. 6 shows a solenoid valve 30 according to a third embodiment of the present invention. Similar to the first embodiment, the electromagnetic valve 30 can be applied to a hydraulic device such as a construction machine or an injection molding machine, or a device that performs pressure control such as control of a continuously variable transmission of a vehicle, flow control, and direction switching. . The solenoid valve 30 is a proportional solenoid capable of arbitrarily controlling the position of a plunger 33 (to be described later) with a characteristic obtained by a spring 14 (to be described later) added to a magnetic pole shape, as in the first embodiment. is there. Hereinafter, the electromagnetic valve 30 will be described, and the same configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof will be omitted.

  The electromagnetic valve 30 of the third embodiment is different from the electromagnetic valve 1 described in the first embodiment in that the step portion 12 is formed in the recess 9 and the later-described plunger 33 is provided with a groove 32 described later. Is different. The recess 31 in the electromagnetic valve 30 is provided with two grooves 32 on the inner peripheral surface. The recess 31 corresponds to the fitting portion in the present invention. In addition, although this groove | channel 32 is provided in two places of the internal peripheral surface of the recessed part 31, you may be provided in more places of the internal peripheral surface of the recessed part 31. FIG. The groove 32 is formed in a V shape with a predetermined depth by combining the tapered surfaces.

  On the other hand, the plunger 33 is formed with a shaft-like portion 34 as in the first embodiment, and a step portion 35 is formed from the end of the shaft-like portion 34 on the bottom side of the plunger 33 in the depth direction of the recess 31. . The stepped portion 35 is smaller than the outer diameter of the shaft-shaped portion 34 and has an outer diameter set according to the size of the inner diameter of the recessed portion 31. On the outer peripheral surface of the stepped portion 35, a groove 36 is formed in a V shape with a predetermined depth, which is formed by combining tapered surfaces.

  The positional relationship in the depth direction of the recessed portion 31 between the groove 32 of the recessed portion 31 and the groove 36 of the stepped portion 35 of the plunger 33 is that the electromagnetic valve 30 is a proportional solenoid. Configured to suppress force changes. In other words, the change in the fitting area between the recess 31 and the plunger 33 is configured so that the change in the suction force according to the movable position of the plunger 33 is suppressed. The electromagnetic valve 30 of the third embodiment is not shaped like a V-shaped groove 32, 36, but has a rectangular cross section as shown in FIG. 42 may be provided. Further, as shown in FIG. 10, the cross section may be formed by a curved surface such as a semicircular shape or a semi-elliptical diameter, and grooves 51 and 52 may be provided in the concave portion 31 and the stepped portion 35, respectively.

  In the electromagnetic valve 30 according to the third embodiment, the electromagnetic force expressed by the magnetic flux lines that connect the action of the magnetic field by the coil 5 from the recessed portion 31 to the stepped portion 35 of the plunger 33 or pass therethrough in the depth direction of the recessed portion 31. In addition, the force by the magnetic field that substantially acts only in the depth direction of the recess 31 is applied to the outer circumferential side of the plunger 33 in the radial direction at the recess 31 and the stepped portion 35 of the plunger 33. Further, a groove 32 of the concave portion 31 and a groove 36 of the stepped portion 35 of the plunger 33 are provided, and a magnetic field acting on both the grooves 32 and 36 acts on the radially outer peripheral side of the plunger 33. Thereby, the suction force according to the movable position of the plunger 33 is increased or decreased, and the suction force is applied in a uniform state regardless of the movable position of the plunger 33.

  In the electromagnetic valve 30 of the third embodiment configured as described above, the plunger 33 is formed of the recess 31 formed in the iron core 6 in the same manner as the electromagnetic valve 1 of the first embodiment and the electromagnetic valve 20 of the second embodiment. The controllability of the solenoid valve 30 is improved by suppressing an increase in suction force due to the stroke, that is, the gap in the axial direction between the plunger 33 and the recess 31 of the iron core 6 being narrowed when sucked in the depth direction. it can. Moreover, since the increase in the attractive force due to the magnetic field acting from the coil 5 can be suppressed, the thrust of the spring 14 can be reduced, so that the power consumption for moving the electromagnetic valve 30 is suppressed. Furthermore, the change of the suction force in the stroke range of the plunger 33 can be adjusted by providing the groove 32 of the concave portion 31 and the groove 36 of the step portion 35 of the plunger 33. Further, the step portion 35 is provided in the concave portion 31 formed in the iron core 6, the step portion 35 is provided in the plunger 33, and the grooves 32 and 36 are provided in the concave portion 31 and the plunger 33. Manufacturability is improved in order to obtain the effects of improving controllability and power saving described above.

  Next, a fourth embodiment of the electromagnetic valve according to the present invention will be described with reference to the drawings. FIG. 7 shows a fourth embodiment of the electromagnetic valve according to the present invention. The electromagnetic valve 60 can be applied to a hydraulic device such as a construction machine or an injection molding machine or a device that performs pressure control, flow rate control, and direction switching such as control of a continuously variable transmission of a vehicle. The solenoid valve 1 is a proportional solenoid capable of arbitrarily controlling the position of a plunger 61 (to be described later) with a characteristic obtained by a spring 66 (to be described later) added to a magnetic pole shape. Hereinafter, the electromagnetic valve 60 will be described, and the same configurations as those of the first to third embodiments will be described with the same reference numerals as those of the first to third embodiments on the drawings. Omitted.

  In the solenoid valve 60 of the fourth embodiment, a plunger 61 is provided with a bottomed cylindrical recess 62, and an iron core that transmits a magnetic force from the coil 5 so as to fit into the recess 62 provided in the plunger 61. 6 is provided with a cylindrical protrusion 63. Further, a stepped portion 64 is provided in a stepped manner on the inner periphery of the recess 62 formed in the plunger 61, and a stepped portion 65 is formed in a stepped manner on the outer peripheral surface of the protruding portion 63 provided on the iron core 6. These step portions 64 and 65 are configured to be fitted to each other. In addition, this projection part 63 is equivalent to the fitting part in this invention. The plunger 61 is configured such that the stepped portions 64 and 65 are fitted and slides in the axial direction (left and right direction in FIG. 7) on the outer peripheral surface of the protruding portion 63.

  A spring 66 is provided at the bottom of the concave portion 62 of the plunger 61. The spring 66 is sandwiched between the bottom portion of the plunger 61 and the tip end portion 67 of the protruding portion, and is configured to apply thrust to the plunger 61 in the axial direction of the protruding portion 63. The step portions 64 and 65 are functionally the same as the step portions 12 and 18 of the electromagnetic valve 1 of the first embodiment and the step portions 22 and 24 of the electromagnetic valve 20 of the second embodiment. That is, when the coil 5 is energized, a magnetic field is generated, and the magnetic flux generated by the magnetic field is provided only in the stepped portions 64 and 65. The structure is such that the force due to the magnetic field acting almost acts on the radially inner peripheral side of the plunger 61, and the force of the magnetic field that gradually increases as the plunger 61 and the projection 63 approach each other. In addition, like the electromagnetic valve 20 of the second embodiment, the plunger 61 is energized in the coil 5 with different dimensions of the fitting surfaces of the stepped portion 64 and the stepped portion 65 of the protruding portion 63 facing each other. Regardless of the action of the magnetic field regardless of the movable position of the plunger 61, the attraction force may be made uniform.

  The operation of the electromagnetic valve 60 of the fourth embodiment configured as described above is substantially the same as that of the electromagnetic valve 1 of the first embodiment and the electromagnetic valve 20 of the second embodiment, and the operation of the magnetic field by the coil 5 is the iron core. 6 is represented by a magnetic flux line connected to or passing through the plunger 61. The protruding portion 63 is provided on the iron core 6, and a magnetic flux is connected from the stepped portion 65 of the protruding portion 63 to the stepped portion 64 of the plunger 61, and an attractive force is applied by the magnetic field generated by the coil 5 in the direction of the magnetic flux. Since the stepped portions 64 and 65 are provided, the magnetic flux connecting the stepped portion 65 of the projection 63 to the stepped portion 64 of the plunger 61 due to the action of the magnetic field by the coil 5 is the axial direction of the projection 63 and the radius of the plunger 61. Acting on both the inner peripheral side of the direction, that is, acting on the inclined side with respect to the axial direction of the protrusion 63, and the force acting on the inner peripheral side of the plunger 61 in the radial direction is released. . Since the force acts on the plunger 61 from the protrusion 63 as described above, the action of the force due to the magnetic field gradually weakens as the plunger 61 approaches the protrusion 63.

  In the solenoid valve 60 of the fourth embodiment configured as described above, when the plunger 61 is sucked in the axial direction of the projection 63 formed on the iron core 6, the stroke, that is, between the plunger 61 and the recess 62 of the iron core 6. The controllability of the electromagnetic valve 60 can be improved by suppressing an increase in suction force due to the narrow gap in the axial direction. In addition, since an increase in attractive force due to the magnetic field acting from the coil 5 can be suppressed, the thrust of the spring 66 can be reduced, so that power consumption for moving the electromagnetic valve 60 is suppressed. Further, the protrusion 63 formed on the iron core 6 is provided with a stepped portion 65, and the plunger 61 is provided with a stepped portion 64. With a simple configuration, the above-described effects such as improved controllability and power saving can be obtained. Therefore, manufacturability is improved.

  Next, a fifth embodiment of the electromagnetic valve according to the present invention will be described with reference to the drawings. FIG. 8 shows a fifth embodiment of the electromagnetic valve according to the present invention. The electromagnetic valve 70 can be applied to a hydraulic device such as a construction machine or an injection molding machine, or a device that performs pressure control, flow rate control, and direction switching such as control of a continuously variable transmission of a vehicle. The electromagnetic valve 70 is a proportional solenoid capable of arbitrarily controlling the position of a plunger 72 described later with a characteristic obtained by a spring 66 described later added to the magnetic pole shape. Hereinafter, the electromagnetic valve 70 will be described, and the same configurations as those of the fourth embodiment are denoted by the same reference numerals as those of the fourth embodiment, and description thereof will be omitted.

  In the solenoid valve 70 of the fifth embodiment, a groove 73 is provided on the inner periphery of a recess 71 provided in a bottomed cylindrical shape on a plunger 72, and a groove is also provided on the outer peripheral surface of a protrusion 74 provided on an iron core 6. 75 is formed, and the concave portion 71 and the protrusion 74 of the plunger 72 having the grooves 73 and 75 are configured to be fitted to each other. In addition, the protrusion part 74 is equivalent to the fitting part of this invention. The grooves 73 and 75 are formed in a shape in which the tapered surfaces are combined in the same manner as the groove 32 of the concave portion 31 of the electromagnetic valve 30 and the groove 36 of the stepped portion 35 of the plunger 33 in the third embodiment. It is formed in a letter shape.

  Further, the grooves 73 and 75 are functionally the same as the grooves 32 and 36 of the electromagnetic valve 30 of the third embodiment. That is, when the coil 5 is energized, a magnetic field is generated, and the magnetic flux generated by the magnetic field is provided with the grooves 73 and 75, so that the magnetic force acting only in the axial direction of the protrusion 74 (electromagnetic force). Is configured to act on the radially inner peripheral side of the plunger 72 to increase or decrease the suction force according to the movable position of the plunger 72. Note that the solenoid valve 70 of the fifth embodiment is not shaped like a V-shaped groove 73, 75, but has a rectangular cross section, as in the third embodiment. 74 may be provided with grooves 73 and 75, respectively. Further, the cross section may be formed by a curved surface such as a semicircular shape or a semi-elliptical diameter, and grooves 73 and 75 may be provided in the concave portion 71 and the protruding portion 74 of the plunger 72, respectively.

  In the solenoid valve 70 of the fifth embodiment configured as described above, the change in the suction force in the stroke range of the plunger 72 is changed to the groove 73 of the concave portion 71 of the plunger 72 and the groove 75 of the protrusion 74 provided on the iron core 6. And can be adjusted by providing. In addition, the groove 73 of the concave portion 71 of the plunger 72 is provided, and the groove 75 of the protrusion 74 provided on the iron core 6 is provided, so that the manufacturability is obtained in order to obtain the effect of improving the controllability as described above. improves. Further, like the solenoid valve 1 of the first embodiment, the stroke when the plunger 72 is sucked in the axial direction of the projection 74 provided on the iron core 6, that is, the axial direction of the plunger 72 and the concave portion 71 of the iron core 6. The controllability of the electromagnetic valve 70 can be improved by suppressing an increase in the attractive force due to the narrowing of the gap at. In addition, since an increase in attractive force due to the magnetic field acting from the coil 5 can be suppressed, the thrust of the spring 66 can be reduced, so that power consumption for moving the electromagnetic valve 70 is suppressed.

  According to the present invention, in a solenoid valve such as a proportional solenoid, a step portion is provided on a plunger (mover) and an iron core (stator), so that attraction by a magnetic field generated by energizing a coil only in the movable direction of the plunger. From the state where the force is applied, a force by a magnetic field is applied to the inner periphery or the outer periphery side in the radial direction of the plunger, and the attractive force that gradually increases as the plunger approaches the iron core is suppressed, thereby improving controllability. Therefore, a step portion is provided in the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment. In addition, since the fifth embodiment is also stepped with protrusions from other iron core parts, it can be said that it has a stepped portion, which is similar to the first to fourth embodiments. An effect can be obtained.

  The correspondence between the first to fifth embodiments described above and the claims of the present invention will be described below. The “fitting part” according to claim 1 corresponds to the recesses 9, 21, 31 or the protrusions 63, 74, and “relative fitting depth” is, in other words, “relative fitting length”. The plungers 15, 23, 33, 61, 72 represent their relative positional relationships in the range in which the plungers 15, 21, 31 can move in the recesses 9, 21, 31 or in the axial direction of the projections 63, 74. The “tip portion” according to claim 2 is the tip on the side where the plungers 15, 23, 33, 61, 72 and the recesses 9, 21, 31 or the projections 63, 74 are opposed to each other. The “concave portion” corresponds to the concave portions 9, 21, 31, 62, 71, and the “convex portion” corresponds to the step portions 18, 24, 35, 65, or the protruding portions 74.

  DESCRIPTION OF SYMBOLS 1 ... Solenoid valve, 2 ... Port, 3 ... Output port, 5 ... Coil, 6 ... Stator, 9 ... Recessed part, 14 ... Elastic member, 15 ... Movable element.

Claims (4)

Stator including an input port, an output port, a mover having a valve body that closes at least one of the input port and the output port, and a fitting portion that fits the mover in the axial direction And a solenoid valve having a coil that applies an electromagnetic force to the mover via the stator, and an elastic member that applies a thrust in a direction opposite to the electromagnetic force to the mover.
The magnetic flux passing between the mover and the stator in the radial direction of the mover increases as the relative fitting depth between the mover and the stator increases. Solenoid valve characterized by.   Either the tip end side of the mover fitted to the stator or the tip end side of the stator fitted to the mover has a large inner diameter at the open end and the opening A recess having a small inner diameter at a location deeper than the end is formed, and the outer diameter of the tip portion that fits into the recess on the other side of the stator that fits with the tip of the mover The electromagnetic valve according to claim 1, wherein a convex portion having a small outer diameter and a large outer diameter at a position retracted from the tip portion is formed.   The concave portion is formed in a shape in which the inner diameter decreases stepwise from the opening end side, and the convex portion is formed in a shape in which the outer diameter increases stepwise from the tip side. The solenoid valve according to claim 2.   The annular groove whose inner diameter increases or decreases is formed on the inner peripheral surface of the concave portion, and another annular groove whose outer diameter increases or decreases is formed on the outer peripheral surface of the convex portion. 2. The solenoid valve according to 2.

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