JP2005291244A - Linear solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve miniaturization of a solenoid part by reducing spaces between laminated coils on a coil bobbin to eliminate unnecessary spaces, and miniaturize a linear solenoid valve by further enhancing attractive force acting on a moving core. <P>SOLUTION: A coil 32 wound on the coil bobbin 30 is formed into a square in section, and, on the base part 17 of a housing 14, a projected supporting part 19 is formed, projecting a predetermined length toward the moving core 26. On the moving core 26, an annular projected part 47 is formed, projecting a predetermined length toward the housing 14, and is placed in an annular space part 49 which is formed between the base part 17 of the housing 14 and the projected supporting part 19 of the housing 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a linear solenoid valve capable of generating an electromagnetic force proportional to an energization amount to a solenoid portion and displacing a valve body by the electromagnetic force.

  2. Description of the Related Art Conventionally, an electromagnetic valve that displaces a valve body by attracting a movable iron core to a fixed iron core by an electromagnetic force generated under the excitation action of a solenoid coil has been used.

  For example, Patent Document 1 discloses a solenoid valve assembly configured by winding the solenoid coil a plurality of times around a coil bobbin. In this case, the solenoid coil is formed by winding a coil having a circular cross section over multiple layers.

JP-A-60-125478

  However, in the solenoid valve assembly disclosed in Patent Document 1, since the solenoid coil has a circular cross section, a gap is generated between the coils stacked on the coil bobbin, as shown in FIG. For this reason, a large number of gaps are formed along the axial direction and the radially outward direction of the coil bobbin by winding a solenoid coil having a circular cross section around the coil bobbin a plurality of times.

  Accordingly, when a solenoid coil having a circular cross section is wound around the coil bobbin a plurality of times, an extra space portion is created by accumulating a large number of gaps generated between the cross sections of the stacked circular solenoid coils. There is a problem that the shape of the entire solenoid coil completed by being wound around the coil bobbin is enlarged. As a result, there is a problem that the entire solenoid portion including the solenoid coil inevitably increases in size.

  Furthermore, there is a demand from the industry to increase the attractive force of the movable core toward the fixed core by increasing the amount of magnetic flux.

  The present invention has been made in consideration of the above-mentioned problems and the like, and by reducing the gap between the coils stacked on the coil bobbin, the extra space is eliminated and the solenoid part is reduced in size. An object of the present invention is to provide a linear solenoid valve that can be reduced in size while further improving the suction force with respect to the movable core.

  In this section, for ease of understanding, the reference numerals in the accompanying drawings will be described in parentheses. However, the contents described in this section should not be construed as being limited to those given the reference numerals.

The present invention provides a linear solenoid valve that generates an electromagnetic force proportional to the energization amount to the solenoid portion and displaces the valve body by the electromagnetic force.
A valve body including a valve body (18) having an inlet port (56) and an outlet port (58) through which pressure fluid flows and a housing (14);
A coil (32) provided on the housing and wound around a coil bobbin (30), a movable core (26) sucked by a fixed core (24) under an energizing action on the coil, and the movable core (26) A solenoid part (12) having a cylindrical yoke (22) surrounding
A valve mechanism (16) having a valve body (66) that is provided on the valve body and switches between a communication state and a non-communication state of the inlet port and the outlet port by transmitting the displacement of the movable core;
With
The bottom (17) of the housing is formed with a protruding support portion (19) that protrudes by a predetermined length toward the movable core, while the movable core protrudes by a predetermined length toward the housing. An annular protrusion (47) is formed;
The annular protrusion (47) is provided in an annular space (49) formed between the bottom (17) of the housing (14) and the projecting support (19) of the housing (14).
The coil (32) is preferably formed in a square cross section or a rectangular cross section.

  According to the present invention, by providing the annular protrusion in the annular space formed between the bottom of the housing and the protruding support portion of the housing, the transfer of magnetic flux from the bottom of the housing to the movable core side becomes smooth. By increasing the amount of magnetic flux, the attractive force of the movable core is improved and the size can be reduced.

  Furthermore, according to the present invention, the gap generated between the stacked coils can be made extremely small by making the cross-sectional shape of the coil wound around the coil bobbin square or rectangular. Therefore, the winding space of the coil wound around the coil bobbin can be reduced.

  In this case, since a high current value can be ensured by reducing the resistance value when the coil is energized, the coil can be suitably used as a vehicle-mounted solenoid valve with a limited minimum applied voltage.

  In addition, an annular flange protruding radially outward is formed only at one end or the other end along the axial direction of the coil bobbin, and the one end or the other end where the annular flange is not formed is made of resin. It is good to coat | cover with the sealing body formed with the material. The length dimension of the coil bobbin in the axial direction is shortened by the thickness dimension of the flange, which can contribute to miniaturization of the solenoid portion. In addition, the coil is stably protected by covering the portion of the coil where the flange is not formed with a sealing body made of a non-conductive material.

  According to the present invention, the following effects can be obtained.

  That is, by making the cross-sectional shape of the coil wound around the coil bobbin square or rectangular, the clearance between the coils stacked on the coil bobbin is reduced, and the extra space is eliminated, thereby reducing the size of the solenoid part. Can be planned.

  Furthermore, by providing the annular protrusion in the annular space formed between the bottom of the housing and the protruding support portion of the housing, the transfer of magnetic flux from the bottom of the housing to the movable core side becomes smooth, and the amount of magnetic flux is reduced. The size can be reduced while further increasing the suction force of the movable core.

  Preferred embodiments of the linear solenoid valve according to the present invention will be described below and described in detail with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates a hydraulic control valve according to an embodiment of the present invention.

  The hydraulic control valve 10 is formed in a bottomed cylindrical shape with a magnetic material such as SUM (JIS standard), for example, and has a housing 14 provided with a solenoid portion (linear solenoid portion) 12 therein, and the housing 14 is integrated with the housing 14. And a valve body 18 having a valve mechanism portion 16 provided therein. The housing 14 and the valve body 18 function as a valve main body.

  The housing 14 includes a cylindrical portion 15, a cylindrical yoke 22 formed at a predetermined interval on the inner peripheral side of the cylindrical portion 15 and disposed substantially parallel to the cylindrical portion 15, and more than the cylindrical portion 15. The cylindrical portion 15, the yoke 22, and the bottom portion 17 are integrally formed.

  The cylindrical yoke 22 is, for example, a member that press-fits a substantially cylindrical yoke formed separately from the housing 14 to a press-fit surface formed on the inner peripheral surface of the bottom portion 17 of the housing 14. It is good.

  The inner wall of the bottom portion 17 is provided with a projecting support portion 19 that is composed of an annular convex portion that extends substantially in parallel with the cylindrical yoke 22 and supports a movable core described later. A hole 52 is formed in the inner central portion of the protruding support portion 19 so as to face one end portion of a shaft 46 to be described later.

  The solenoid unit 12 includes a coil assembly 20 accommodated in the housing 14 and a cylindrical shape that is integrally formed with the housing 14 on the closed end side of the housing 14 and disposed inside the coil assembly 20. A yoke 22, a fixed core 24 that is coupled to the opening end of the housing 14 and is disposed along the axial direction inside the coil assembly 20 with a predetermined clearance from the yoke 22, the yoke 22, And a movable core 26 slidably fitted to the fixed core 24.

  The coil assembly 20 is formed of a synthetic resin material and has a coil bobbin 30 having flanges 28a and 28b at both ends along the axial direction, and is wound around the coil bobbin 30 a plurality of times. As shown, the coil 32 is formed of a square wire formed in a square cross section.

  By forming the coil 32 to have a square cross section, contact between the coils 32 wound around the coil bobbin 30 becomes surface contact. Therefore, the coil 32 is stably and aligned at a predetermined position. Thereby, as FIG. 5 shows, the one flange 28a (28b) of the coil bobbin 30 can be made unnecessary. By eliminating the one flange 28a (28b), the axial dimension of the entire solenoid portion 12 is shortened, and the size can be reduced.

  In addition, when a coil according to the prior art formed in a circular cross section as shown in FIG. 12 is wound around a coil bobbin, a force that collapses toward the flange acts due to the tension when winding the coil. In the coil 32 having a square cross section, the force that collapses toward the flange 28a (28b) due to the surface contact between the coils 32 does not work, so that one flange 28a (28b) can be dispensed with.

  In addition, as FIG.6 and FIG.7 shows, you may use the other coil 32a which consists of a flat conducting wire formed in the cross-sectional rectangle. In this case, the coil 32 formed in a square cross section can be set with a smaller winding space than the coil 32a formed in a rectangular cross section. Furthermore, in the coil 32 having a square cross section, since the peripheral dimension of the cross section can be reduced as compared with the coil 32a having a rectangular cross section, the cross-sectional area of the insulating coating on the coil 32 can be set small.

  The yoke 22 and the fixed core 24 that are spaced apart from each other by a predetermined distance are formed on the outer peripheral surface of the annular vertical surface portion 34 formed on one end surface of the cylindrical yoke 22 and the concave portion 36 of the fixed core 24. A conical surface portion 38 is provided. A tapered portion 35 for reducing leakage magnetic flux is chamfered in the circumferential direction on one end surface of the yoke 22 adjacent to the vertical surface portion 34.

  The yoke 22 and the fixed core 24 are formed with a cylindrical portion and a recess 36 corresponding to the shape of the movable core 26, and the movable core 26 reciprocates between the cylindrical yoke 22 and the recess 36 of the fixed core 24. A linear solenoid structure to be operated can be used.

  Between the housing 14 and the coil 32, there is provided a resin sealing body 40 that molds the outer peripheral surface of the coil 32 and a part of the coil bobbin 30, and the resin sealing body 40 is a coupler portion that energizes the coil 32. 42 is integrally formed of resin material. The coupler portion 42 is provided so that the terminal portion 44a of the terminal 44 electrically connected to the coil 32 is exposed.

  By covering the outer peripheral surface of the coil 32 with the resin sealing body 40, the coil 32 can be stably protected. Further, when the flange 28a (28b) formed at one end of the coil bobbin 30 is not necessary, the unnecessary portion of the flange 28a (28b) is covered with the resin sealing body 40, thereby further increasing the coil. 32 is stably protected.

  As shown in FIG. 3, the movable core 26 is formed integrally with a movable core body 45 formed of a cylindrical body and one end surface of the movable core body 45, and has a predetermined length toward the bottom 17 side of the housing 14. And an annular protrusion 47 protruding only. The annular protrusion 47 is provided so as to face an annular space portion 49 formed between the cylindrical yoke 22 and the inner wall surface of the bottom portion 17 of the housing 14 and the protruding support portion 19 of the housing 14.

  In this case, a predetermined and uniform clearance is formed along the circumferential direction between the inner peripheral surface of the annular projecting portion 47 and the outer peripheral surface of the projecting support portion 19, and in FIG. The inner circumferential section 47a and the outer circumferential section 19a of the projecting support portion 19 are formed substantially parallel to each other.

  Further, a pressure oil circulation hole (pressure fluid circulation hole) 51 penetrating in a direction orthogonal to the axis of the shaft 46 (diameter direction of the movable core body 45) is formed at a boundary portion between the movable core body 45 and the annular protrusion 47. The pressure oil circulation hole 51 functions as a pressure oil breathing hole when the annular protrusion 47 of the movable core 26 enters the annular space 49. In addition, the said pressure oil circulation hole is good to be formed so that it may be orthogonal to a single or cross shape.

  A shaft 46 penetrating the central portion of the movable core 26 is fixed to the movable core 26, and one end portion of the shaft 46 is a first plain bearing (first bearing) mounted in a hole portion 52 of a protruding support portion of the housing 14. A second plain bearing (second bearing) is slidably supported in the axial direction via 48 a, and the other end of the shaft 46 is mounted in a through hole 50 that penetrates the center of the fixed core 24. It is supported so as to be slidable in the axial direction via 48b.

  The movable core 26 and the shaft 46 are integrally coupled by crimping one end portion and the other end portion along the axial direction of the movable core 26 to which the shaft 46 is attached to deform inward in the radial direction. . In addition, the movable core 26 and the shaft 46 may not be configured separately, and the movable core 26 may be integrally formed including the shaft 46.

  Thus, the movable core 26 can be made into a both-ends support structure via the 1st and 2nd flat bearings 48a and 48b which respectively support the both ends of the shaft 46 which penetrates. By making the shaft 46 have a both-ends support structure, it is possible to ensure stable straightness of the movable core 26.

  The first flat bearing 48a is press-fitted and fixed in the hole 52 of the projecting support portion of the housing 14, and the first flat bearing 48a has a first axial communication that communicates between both end surfaces thereof. A groove 54a is formed. The second flat bearing 48b is press-fitted and fixed to the inner peripheral surface of the through hole 50, and the second flat bearing 48b is connected to the outer peripheral surface of the second flat bearing 48b in the axial direction through the second communication groove 54b. Is formed. Further, the outer peripheral surface of the movable core 26 is formed with a third communication groove 54c in the axial direction that communicates between both end surfaces.

  A ring body 55, which is formed of a nonmagnetic material and functions as a spacer for preventing residual magnetism in the solenoid portion 12, is provided on the end surface of the movable core 26 facing the fixed core 24 via the shaft 46.

  That is, residual magnetism is generated in the fixed core 24 or the movable core 26 when the energization of the solenoid unit 12 is interrupted, and the movable core 26 may not be separated from the fixed core 24 under the action of the residual magnetism. By providing the ring body 55 via the shaft 46, a predetermined clearance is formed between the fixed core 24 and the occurrence of residual magnetism can be suppressed.

  The movable core 26 may be made of, for example, ferritic stainless steel such as SUS410L or SUS405 (JIS standard), general steel such as S10C (JIS standard), or free-cutting steel material such as SUM (JIS standard). .

  The magnetic material forming the movable core 26 can improve durability by using a material containing Cr in an amount of 12% by weight or less.

  The valve mechanism 16 includes a valve body 18 having an inlet port 56, an outlet port 58, a drain port 60, and a breather port 62 communicating with an oil tank (not shown) on the side, and a space inside the valve body 18. The part 64 has a spool valve (valve element) 66 disposed so as to be displaceable along the axial direction.

  In the spool valve 66, a first land portion 66a, a second land portion 66b, and a third land portion 66c are formed in this order from the solenoid portion 12, and the first land portion 66a and the second land portion 66b are the same. The third land portion 66c is formed to have a diameter slightly smaller than the first and second land portions 66a and 66b.

  A space portion 64 of the valve body 18 is closed by an end block 68, and a return spring that constantly presses the spool valve 66 toward the solenoid portion 12 between the end block 68 and the spool valve 66. 70 is disposed. The return spring 70 is not limited to a coil spring, and may be constituted by an elastic body including a leaf spring (not shown), for example.

  The end surface of the spool valve 66 adjacent to the solenoid portion 12 is provided so as to contact the end surface of the shaft 46, and the spring force of the return spring 70 is applied to the movable core 26 via the spool valve 66 and the shaft 46. Thus, the movable core 26 is in a state of being pressed toward the direction of the arrow X1 in FIG.

  The hydraulic control valve 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described.

  When the solenoid unit 12 is not energized (OFF state), as shown in FIG. 1, the spool valve 66 is pressed in the direction of arrow X <b> 1 in FIG. 1 by the spring force (pressing force) of the return spring 70. In this state, the communication between the inlet port 56 and the outlet port 58 is blocked.

  Therefore, by energizing a power source (not shown) and energizing the coil 32, the solenoid unit 12 is excited and turned on, and an electromagnetic force is generated by the magnetic circuit 82 as shown in FIG. In this case, an electromagnetic force proportional to the amount of current supplied to the coil 32 is generated, and the electromagnetic force is applied to the movable core 26. Therefore, when the spool valve 66 is displaced in the direction of the arrow X2 against the pressing force of the return spring 70 under the action of the electromagnetic force, the communication between the drain port 60 and the outlet port 58 is blocked, The inlet port 56 and the outlet port 58 communicate with each other (see FIG. 2).

  Accordingly, the pressure oil supplied from a hydraulic source (not shown) is supplied to a hydraulic operating device (not shown) through the inlet port 56 and the outlet port 58 via a passage (not shown). When the energization to the solenoid unit 12 is stopped, the solenoid unit 12 is turned off and returned to the initial position shown in FIG.

  In the present embodiment, a projecting support portion 19 formed of an annular convex portion is formed on the bottom portion 17 of the housing 14, and the yoke 22, the bottom portion 17 and the projecting support portion are formed on the end surface of the movable core 26 facing the bottom portion 17 of the housing 14. By providing an annular protrusion 47 that faces an annular space 49 formed between the housing 19 and the movable core 26, the magnetic flux is transferred from the bottom 17 of the housing 14 to the movable core 26 side. Therefore, the magnetic flux can be smoothly transferred between the bottom portion 17 of the housing 14 and the annular projection 47 of the movable core 26, and the amount of magnetic flux can be increased.

  That is, as shown in FIG. 8, the flow of magnetic flux generated under the energization action on the coil 32 flows from the inner peripheral surface of the cylindrical yoke 22 via the bottom portion 17 of the housing 14 to the side peripheral surface of the movable core 26. The annular protrusion of the movable core 26 is not only from the flow of the magnetic flux flowing toward (see the magnetic flux A in FIG. 8), but also from the inner peripheral surface of the portion corresponding to the bottom 17 via the bottom 17 of the housing 14. A flow of magnetic flux flowing toward the portion 47 (see magnetic flux B in FIG. 8) is formed.

  Therefore, when the magnetic flux flows through the bottom portion 17 of the housing 14 toward the movable core 26, for example, after the magnetic flux flows into the cylindrical yoke 22 via the bottom portion 17 of the housing 14, the yoke 22 Compared with a magnetic circuit (not shown) of a solenoid valve according to the prior art constituted only by the magnetic flux A flowing from the movable core 26 toward the movable core 26 side, this embodiment corresponds to the bottom 17 of the housing 14. The magnetic flux B flows from the inner peripheral surface of the part toward the movable core 26 side (annular protrusion 47), so that the magnetic flux can be circulated extremely smoothly and the amount of magnetic flux in the entire magnetic circuit 82 is circulated. That is, the amount of magnetic flux (magnetic flux A + magnetic flux B) can be increased.

  As a result, the suction force with respect to the movable core 26 can be greatly improved, and the overall structure of the hydraulic control valve 10 can be reduced in the case of the same suction force.

  Further, by providing the annular protrusion 47 in the annular space 49, the protruding support portion 19 is disposed in the annular protrusion 47 of the movable core 26. As a result, the inner peripheral space of the end of the movable core 26 on the bottom surface side of the housing 14 can be used effectively. For example, the housing is compared with the case where the projecting support portion projects outward from the outer bottom surface of the housing. It is possible to reduce the size by flattening the outer bottom surface. Thus, by providing the annular protrusion 47 in the annular space 49, it is possible to reduce the size while further improving the suction force with respect to the movable core 26.

  Further, as shown in FIG. 3, the inner circumferential section 47a and the outer circumferential section 19a are formed in parallel by forming the inner circumferential section 47a of the annular protrusion 47 and the outer circumferential section 19a of the projecting support section 19 in parallel. It is possible to make the clearance of the as small as possible. As a result, for example, the annular protrusion 47 can be thickened in the circumferential direction in the annular space 49 so that the space can be used effectively.

  Furthermore, in the present embodiment, by making the cross-sectional shape of the coil 32 wound around the coil bobbin 30 constituting the solenoid portion 12 square, the gap generated between the stacked coils 32 can be extremely reduced. Therefore, for example, when compared with a conventional technique in which a solenoid coil having a circular cross section has the same number of turns, the total cross sectional area of the coil 32 (the entire space of the coil 32 wound around the coil bobbin 30) can be set small. .

  Paradoxically, this means that the ratio of the conductor cross-sectional area tightened in the winding space of the coil 32, that is, the conductor occupation ratio, can be set larger than that of the circular cross-section.

  Therefore, since the winding space of the coil 32 can be reduced, the shape of the coil bobbin 30 can be reduced, and ultimately the solenoid unit 12 as a whole can be reduced in size.

  Further, for example, when the winding space is the same as that of the solenoid coil having a circular cross section, in the present embodiment using the coil 32 having a square cross section, the number of turns on the coil bobbin 30 can be increased. The attraction force (electromagnetic force) generated at 12 can be increased.

  Further, in the present embodiment, since the winding space of the coil 32 can be reduced, the continuous total dimension (full length) of the coil 32 can be reduced. Therefore, the resistance value of the coil 32 can be reduced, and the power consumption consumed when the coil 32 is energized can be suppressed.

  For example, when the coil 32 having a circular cross section is formed so as to have the same resistance value as that of the coil having a circular cross section, in the present embodiment, the number of windings around the coil bobbin 30 can be set to a large value. Electromagnetic force) can be improved.

  Furthermore, in the present embodiment, since the contact surface between the stacked coils 32 is a surface contact, the single line occupancy in the winding space can be set larger than that of the coil having a circular cross section. it can.

  Therefore, the gap generated between the stacked coils 32 can be made extremely small, and the occupation density of each coil 32 per unit volume of the winding space can be improved. Thereby, the heat conductivity (heat dissipation) in a winding space can be improved. For example, when applied to an electromagnetic valve that is used in an environment where the ambient temperature is lower than the coil heat generation temperature, the heat dissipation is improved. Therefore, in addition to the fact that the resistance value of the coil 32 can be set small as described above, further energization Heat generation in the coil 32 during heat generation can be reduced, and therefore the resistance value can be further reduced.

  Furthermore, the solenoid part 12 including the coil 32 formed in a square cross section can be suitably applied as a vehicle-mounted solenoid valve. In-vehicle components are generally limited to a minimum applied voltage (for example, 8 V) by a battery voltage. And since it is requested | required as a vehicle-mounted solenoid valve to ensure the minimum magnetomotive force (electric current value), for example, when the same magnetic circuit is used, a maximum resistance value will be decided inevitably. Here, since the resistance value of the coil 32 generally increases as the temperature of the coil 32 increases, the maximum resistance value must be a value that also takes into account the increased resistance value. For example, if the maximum resistance value is set without taking this rising resistance value into consideration, the necessary current value cannot be obtained, and the minimum magnetomotive force may not be obtained. That is, when used as an in-vehicle solenoid valve, it is necessary to secure a magnetomotive force (current value) even if the resistance value of the coil 32 is energized through the solenoid unit 12 and the temperature of the coil 32 is increased.

  Therefore, if the resistance value of the coil 32 and the resistance value of the coil 32 during energization heat generation are low, a high current value can be secured by Ohm's law, which is extremely beneficial. That is, by making the cross-sectional shape of the coil 32 square, for example, in the solenoid unit 12 that can obtain the same magnetomotive force, the resistance value of the coil 32 is reduced to reduce power consumption. The amount of heat generated by the coil 32 during energization decreases, and the resistance value during energization heat generation can be reduced.

  As a result, since the resistance value of the coil 32 during energization heat generation can be reduced to ensure a high current value, it can be suitably used as an in-vehicle electromagnetic valve in which the minimum applied voltage is limited. Further, for example, the solenoid unit 12 having the coil 32 having a square cross section compared to other solenoid units having the same minimum magnetomotive force constituted by coils having a circular cross section has a current value that can be increased. Since the number of turns on the coil bobbin 30 can be reduced, further downsizing can be achieved.

  Next, a hydraulic control valve 100 according to another embodiment of the present invention is shown in FIGS. The same components as those in the embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the hydraulic control valve 100 according to another embodiment, the outer peripheral surface of the protruding support portion 102 formed on the bottom portion 17 of the housing 14 is formed on the tapered surface 104 that gradually decreases in diameter toward the movable core 26 side. The inner peripheral surface of the annular protrusion 106 of the movable core 26 facing the tapered surface 104 of the protruding support portion 102 through a predetermined clearance is formed on the reverse tapered surface 108 corresponding to the tapered surface 104. This is different from the hydraulic control valve 10 according to the embodiment (see FIG. 11).

  That is, in the hydraulic control valve 10 according to the embodiment, the inner circumferential section of the annular protrusion 47 and the outer circumferential section of the projecting support section 19 are formed in parallel with each other. In the hydraulic control valve 100 according to the above, the inner circumferential section of the annular protrusion 106 and the outer circumferential section of the projecting support section 102 are formed on the tapered surface 104 and the reverse tapered surface 108 that are inclined by a predetermined angle so as to intersect the axis of the shaft 46. Is different.

  In this case, the outer peripheral surface of the projecting support portion 102 is a tapered surface 104 whose diameter is reduced toward the movable core 26, and the inner peripheral surface of the annular protrusion 106 of the movable core 26 is a reverse tapered surface 108 corresponding to the tapered surface 104. Thus, the force that the movable core 26 receives from the oil when the movable core 26 is actuated can be improved.

  That is, when the movable core 26 is turned on toward the fixed core 24, the distance between the taper surface 104 and the reverse taper surface 108 increases in the direction of separating, so that the oil shearing force is reduced. Accordingly, it is possible to improve the operation of the movable core 26 during suction.

  The relationship between the outer peripheral surface of the projecting support portion 102 and the inner peripheral surface of the annular projecting portion 106 is parallel, or a tapered surface or an inversely tapered surface. However, the present invention is not limited to this. The outer peripheral surface of the support portion 102 may be parallel, and the inner peripheral surface of the annular protrusion 106 may be a tapered surface. Further, the outer peripheral surface of the protruding support portion 102 may be a tapered surface, and the inner peripheral surface of the annular protrusion 106 may be parallel. Furthermore, a predetermined angle difference may be provided between the tapered surface 104 of the projecting support portion 102 and the reverse tapered surface 108 of the annular projection portion 106 so as to intersect each other.

  Further, the protruding support portion 102 of the housing 14 has a tapered surface 104 that decreases in diameter toward the movable core 26 side, that is, the diameter gradually increases toward the base portion thereof. The strength of 102 can be increased. Furthermore, since the protruding support portion 102 has a draft angle toward the open side of the housing 14, the housing 14 can be easily manufactured by forging.

  Other configurations and operational effects are the same as those in the above embodiment, and detailed description thereof is omitted.

It is a longitudinal cross-sectional view along the axial direction of the hydraulic control valve which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the state which the spool valve displaced by exciting the solenoid part of the hydraulic control valve shown in FIG. It is a partial expanded longitudinal cross-sectional view of the coil assembly which comprises the said hydraulic control valve. It is the partial expanded longitudinal cross-sectional view by which the coil of the cross-sectional square was wound by the coil bobbin. It is a partial expanded longitudinal cross-sectional view which shows the state from which the flange formed in the coil bobbin was removed. It is a partial expanded longitudinal cross-sectional view which concerns on the modification of the coil assembly shown in FIG. FIG. 5 is a partially enlarged longitudinal sectional view in which a coil having a rectangular cross section is wound around a coil bobbin. It is a partially omitted enlarged explanatory view showing a magnetic circuit formed in a solenoid part. It is a longitudinal cross-sectional view along the axial direction of the hydraulic control valve which concerns on other embodiment of this invention. FIG. 10 is a longitudinal sectional view showing a state where the spool valve is displaced by exciting a solenoid portion of the hydraulic control valve shown in FIG. 9. It is a partially omitted enlarged explanatory view showing a magnetic circuit formed in a solenoid part. It is the partial expanded longitudinal cross-sectional view by which the coil which concerns on a prior art was wound by the coil bobbin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 100 ... Hydraulic control valve 12 ... Solenoid part 14 ... Housing 16 ... Valve mechanism part 17 ... Bottom part 18 ... Valve body 19, 102 ... Projection support part 20 ... Coil assembly 22 ... Yoke 24 ... Fixed core 26 ... Movable core 28a 28b ... Flange 30 ... Coil bobbin 32, 32a ... Coil 34 ... Vertical surface portion 36 ... Concave surface 38 ... Conical surface portion 40 ... Resin sealing body 45 ... Movable core body 46 ... Shaft 47 ... Annular protrusions 48a, 48b ... Plain bearing 49 ... Annular space 50 ... Through hole 51 ... Pressure oil flow hole 54a-54c ... Communication groove 55 ... Ring body 56 ... Inlet port 58 ... Outlet port 64 ... Space part 66 ... Spool valve 82 ... Magnetic circuit

Claims (8)

In the linear solenoid valve that generates an electromagnetic force proportional to the energization amount to the solenoid portion and displaces the valve body by the electromagnetic force,
A valve body including a valve body and a housing having an inlet port and an outlet port through which pressure fluid flows; and
A solenoid unit provided in the housing and having a coil wound around a coil bobbin, a movable core that is attracted to the fixed core under a current-carrying action on the coil, and a cylindrical yoke that surrounds the movable core;
A valve mechanism provided on the valve body and having a valve body that switches between a communication state and a non-communication state of the inlet port and the outlet port by transmitting the displacement of the movable core;
With
The coil is formed in a square cross section,
The bottom of the housing is formed with a protruding support portion that protrudes by a predetermined length toward the movable core, while the movable core is formed with an annular protrusion that protrudes by a predetermined length toward the housing. ,
The linear solenoid valve according to claim 1, wherein the annular protrusion is provided in an annular space formed between a bottom portion of the housing and a protruding support portion of the housing. The valve of claim 1, wherein
The linear solenoid valve according to claim 1, wherein the valve is mounted on a vehicle. The valve of claim 1, wherein
A linear solenoid valve characterized in that the coil bobbin is formed with an annular flange projecting radially outward only at one end or the other end along the axial direction of the coil bobbin. The valve according to claim 3,
One end or the other end along the axial direction of the coil bobbin in which the annular flange is not formed is covered with a sealing body made of a resin material. In the linear solenoid valve that generates an electromagnetic force proportional to the energization amount to the solenoid portion and displaces the valve body by the electromagnetic force,
A valve body including a valve body and a housing having an inlet port and an outlet port through which pressure fluid flows; and
A solenoid unit provided in the housing and having a coil wound around a coil bobbin, a movable core that is attracted to the fixed core under a current-carrying action on the coil, and a cylindrical yoke that surrounds the movable core;
A valve mechanism provided on the valve body and having a valve body that switches between a communication state and a non-communication state of the inlet port and the outlet port by transmitting the displacement of the movable core;
With
The coil is formed in a rectangular cross section,
The bottom of the housing is formed with a protruding support portion that protrudes by a predetermined length toward the movable core, while the movable core is formed with an annular protrusion that protrudes by a predetermined length toward the housing. ,
The linear solenoid valve according to claim 1, wherein the annular protrusion is provided in an annular space formed between a bottom portion of the housing and a protruding support portion of the housing. The valve according to claim 5, wherein
The linear solenoid valve according to claim 1, wherein the valve is mounted on a vehicle. The valve according to claim 5, wherein
A linear solenoid valve characterized in that the coil bobbin is formed with an annular flange projecting radially outward only at one end or the other end along the axial direction of the coil bobbin. The valve according to claim 7,
One end or the other end along the axial direction of the coil bobbin in which the annular flange is not formed is covered with a sealing body made of a resin material.

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