JP2008157430A - Solenoid driving device and solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of sticking due to foreign matter entering a solenoid part. <P>SOLUTION: This solenoid driving device has a coil 17, a core 34, a yoke 20 disposed surrounding the coil 17 and the core 34, and a plunger 14 disposed slidably along the inner peripheral wall of a hollow part 22 formed radially inward from the core 34 to form a cylinder head part in front and a cylinder bottom part in the rear. An oil passage 30 for supplying/discharging oil outside a solenoid valve to/from the cylinder bottom part is formed between an oil inflow/outflow part and the cylinder bottom part. The oil passage 30 is formed in communication with the oil inflow/outflow part, and comprises a first axial passage extending in an axial direction and a second axial passage communicating with the first axial passage and communicating with a circumferential passage and the cylinder bottom part in at least two circumferential parts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a solenoid driving device and a solenoid valve.

  Conventionally, for example, various solenoid valves are provided in a hydraulic circuit of an automatic transmission, and a linear solenoid valve of the solenoid valves includes a solenoid unit and a pressure regulating valve unit, and supplies a current to a coil of the solenoid unit. Supplying the pressure actuates the pressure regulating valve portion to generate a predetermined oil pressure.

  For this purpose, the linear solenoid valve is configured such that the plunger is slidably movable in the core, and when a current is supplied to the coil, the magnetic path returns from the yoke to the yoke through the core, the plunger and the core in order. Is formed, and accordingly, the plunger is attracted to the core.

  The pressure regulating valve portion includes a valve body, a spool that is fitted and retracted with respect to the valve body, and a spring that biases the spool toward the solenoid portion with a predetermined spring load. Prepare.

As the plunger is moved, the spool is moved to oppose the spring force, and a predetermined hydraulic pressure is generated (see, for example, Patent Document 1).
JP 2004-293663 A

  However, in the conventional linear solenoid valve, when the plunger is advanced and retracted, oil is supplied into the yoke by the pumping action, and accordingly, foreign matter that has entered the solenoid portion is caused, for example, between the core and the plunger. If you enter in between, a stick will be generated.

  It is an object of the present invention to provide a solenoid driving device and a solenoid valve that can solve the problems of the conventional linear solenoid valve and prevent the stick from being generated by a foreign matter that has entered the solenoid portion. .

  Therefore, in the solenoid drive device of the present invention, a coil formed by winding a winding around a bobbin, a core disposed adjacent to the coil, and surrounding the coil and the core. A provided yoke, and a plunger that is slidably disposed on an inner peripheral wall of a hollow portion formed radially inward from the core, and that forms a cylinder head at the front and a plunger that forms the cylinder bottom at the rear. Have.

  An oil passage for supplying and discharging oil outside the solenoid valve to and from the cylinder bottom is formed between the oil inflow / outflow part formed at a predetermined portion of the yoke and the cylinder bottom.

  The oil passage is formed between the inner peripheral surface of the yoke and the outer peripheral surface of the coil so as to communicate with the oil inflow / outflow portion, and extends in the axial direction. A circumferential flow path that communicates with the axial flow path and extends in the circumferential direction, and is formed between the inner peripheral surface of the yoke and the outer peripheral surface of the core. And a second axial flow path that communicates with the circumferential flow path and the cylinder bottom.

  According to the present invention, in the solenoid driving device, a coil formed by winding a winding around a bobbin, a core disposed adjacent to the coil, and surrounding the coil and the core. A provided yoke, and a plunger that is slidably disposed on an inner peripheral wall of a hollow portion formed radially inward from the core, and that forms a cylinder head at the front and a plunger that forms the cylinder bottom at the rear. Have.

  An oil passage for supplying and discharging oil outside the solenoid valve to and from the cylinder bottom is formed between the oil inflow / outflow part formed at a predetermined portion of the yoke and the cylinder bottom.

  The oil passage is formed between the inner peripheral surface of the yoke and the outer peripheral surface of the coil so as to communicate with the oil inflow / outflow portion, and extends in the axial direction. A circumferential flow path that communicates with the axial flow path and extends in the circumferential direction, and is formed between the inner peripheral surface of the yoke and the outer peripheral surface of the core. And a second axial flow path that communicates with the circumferential flow path and the cylinder bottom.

  In this case, since the first oil passage is formed, when the plunger is advanced and retracted, a sufficient amount of oil can be supplied to and discharged from the cylinder bottom, and the plunger can be smoothly advanced and retracted. In addition, since the first oil passage can be lengthened, it becomes difficult for foreign matter that has entered from the first oil inflow / outflow portion to reach the bottom of the cylinder, and it is possible to prevent sticking from occurring in the solenoid valve. it can.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this case, a linear solenoid valve among the solenoid valves will be described.

  1 is a cross-sectional view of a linear solenoid valve according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a response of the linear solenoid valve according to the first embodiment of the present invention. It is a figure explaining property.

  In the figure, reference numeral 10 denotes a linear solenoid valve, and the linear solenoid valve 10 is disposed, for example, in a hydraulic circuit of an automatic transmission. In the hydraulic circuit, the hydraulic pressure discharged from an oil pump (not shown) is adjusted to a line pressure by a primary regulator valve (not shown), and the line pressure is supplied to the linear solenoid valve 10 as an input pressure.

  The linear solenoid valve 10 is operated based on an electric current, and supplies a hydraulic pressure corresponding to the electric current to a hydraulic servo as an actuator of a friction engagement element (not shown) and a supply destination.

  Further, 51 is a solenoid part constituting a solenoid drive device, 12 is a pressure regulating valve part constituting a valve part operated by driving the solenoid part 51, and the linear solenoid valve 10 includes the solenoid part 51 and The pressure regulating valve portion 12 is provided and is attached horizontally to an automatic transmission case (not shown).

  The solenoid 51 includes a coil assembly 13, a plunger 14 that can be moved forward and backward (moved in the left-right direction in FIG. 1) relative to the coil assembly 13, and an outer side that surrounds the coil assembly 13. A yoke 20 and a terminal tm for supplying current to the coil 17 of the coil assembly 13 are provided. As the plunger 14 moves forward (moves in the left direction in FIG. 1), the plunger 14 moves toward the pressure regulating valve portion 12 and moves backward (moves in the right direction in FIG. 1). Therefore, in the description of the present invention, the pressure regulating valve portion 12 side of the linear solenoid valve 10 is the front (left side in FIG. 1), and the solenoid portion 51 side is the rear (FIG. 1 on the right).

  The coil assembly 13 includes a bobbin 15, the coil 17 formed by winding a winding 16 around the bobbin 15, a core 34 having a main portion disposed radially inward from the coil 17, and the like. Is provided. The core 34 is adjacent to the coil 17 radially inward from the coil 17 and extends rearward from a predetermined portion of the coil 17, in the present embodiment, near the front end (left end in FIG. 1). A cylindrical end portion 18 disposed at a predetermined position, a predetermined portion of the coil 17, in the present embodiment, an annular end portion 19 disposed in front of the vicinity of the front end, and an end portion 18, 19 includes a cylindrical magnetic shielding portion 21 as a magnetoresistive portion disposed between the bobbin 15, the end portions 18 and 19, and the magnetic shielding portion 21, welding, brazing, and sintering joining. They are assembled together by bonding or the like. The end portion 18 constitutes a first inner yoke, and the end portion 19 constitutes a second inner yoke. Further, the end portion 19 forms a flange portion in the core 34 and is formed so as to extend from a portion radially inward from the coil 17 toward the radially outer side.

  The magnetic shielding portion 21 includes a first surrounding portion 31 that covers the thin portion 18a at the front end of the end portion 18 from the outside, a second surrounding portion 32 that covers the rear end (right end in FIG. 1) of the end portion 19 from the outside, In order to magnetically separate between the end portions 18 and 19, the first and second surrounding portions 31 and 32 are formed so as to protrude radially inward and to face the plunger 14. The separation part 33 is provided.

  As a magnetoresistive part, instead of the magnetic shielding part 21, a thin part in which a part of the first and second inner yokes is thinned is formed, or in a part of the first and second inner yokes, It is possible to form a hole-opening portion provided with a plurality of holes extending in the radial direction. In this case, the first and second inner yokes and the hole opening are integrally formed.

  The coil assembly 13 is formed in a cylindrical shape excluding the portion of the terminal tm. A hollow portion 22 having a constant diameter in the axial direction is formed in the core 34, and the plunger 14 is placed in the hollow portion 22. The core 34 is slidably inserted into the core 34. Therefore, the plunger 14 is supported by the coil assembly 13 in a state of being fitted into the core 34.

  The yoke 20 is composed of a bottomed cylindrical body, and is formed with a thickness between the cylindrical portion 55 surrounding the coil 17, a bottom portion 56 having a circular shape, and the cylindrical portion 55 and the bottom portion 56. And a corner portion 57 surrounding the portion of the core 34 projecting rearward from the rear end of the coil 17, and the cylindrical portion 55, the bottom portion 56, and the corner portion 57 by plastic metal processing such as deep drawing and cold forging. Are integrally formed. A notch 58 having a rectangular shape is formed at a predetermined portion in the circumferential direction of the front end of the cylindrical portion 55, and a terminal tm is attached to the coil assembly 13 through the notch 58. A thin caulking portion 80 is formed at the front end of the cylindrical portion 55, the coil assembly 13 is fitted into the yoke 20, and the valve main body 62 of the pressure regulating valve portion 12 is set. The solenoid part 51 and the pressure regulation valve part 12 are assembled | attached integrally by crimping the flange part 63 formed in the rear end.

  At this time, the outer peripheral edge of the diaphragm dp as a separating member for separating the inside of the solenoid portion 51 and the pressure regulating valve portion 12 is sandwiched between the end portion 19 and the flange portion 63. Since the inner peripheral edge of the diaphragm dp is attached to the spool 26 of the pressure regulating valve portion 12, the diaphragm dp completely separates the solenoid portion 51 and the pressure regulating valve portion 12 from each other.

  The outer circumferential surface of the plunger 14 has a constant diameter in the axial direction, and is longer than the coil 17 in the axial direction. In the plunger 14, a plunger abutting portion 72 formed at the rear end of the spool 26 of the pressure regulating valve portion 12 is brought into contact with the center of the front end surface (left end surface in FIG. 1), and the rear end surface (FIG. 1 is brought into contact with a contact portion 27 as a protrusion formed by protruding from the bottom portion 56. The surface of the contact portion 27 is subjected to a surface treatment to form an outer layer (not shown) made of a nonmagnetic material. As described above, the contact portion 27 is formed on the bottom portion 56 and the outer layer made of a nonmagnetic material is formed on the surface of the contact portion 27, so that the plunger 14 is in contact with the yoke 20. And the contact portion 27 can be prevented from generating magnetic flux, and magnetism can be separated.

  In the present embodiment, the contact portion 27 is formed on the bottom portion 56. However, the contact portion 27 is formed on the rear end surface of the plunger 14 so as to protrude toward the bottom portion 56 side. A contact portion may be formed on both the yoke 14 and the yoke 20.

  Further, a plurality of oil passages 30 having a predetermined diameter in the axial direction are formed through the plunger 14, and the front end side (left end side in FIG. 1) and the rear end of the plunger 14 are passed through the oil passage 30. The side (the right end side in FIG. 1) is communicated. Therefore, as the plunger 14 is advanced and retracted, the oil in the cylinder head of the yoke 20 between the front end of the plunger 14 and the diaphragm dp in the hollow portion 22 flows backward, or the plunger in the hollow portion 22 14, the oil in the cylinder bottom part of the yoke 20 between the rear end and the bottom part 56 flows forward. An oil sump is formed by the cylinder bottom.

  The bobbin 15 and the magnetic shielding part 21 are made of a non-magnetic material. As the non-magnetic material, for example, a non-magnetic metal such as stainless steel (SUS) can be used, or a synthetic resin can be used. Further, the end portions 18 and 19, the yoke 20 and the plunger 14 are made of a magnetic material, preferably a ferromagnetic material, and for example, electromagnetic soft iron or the like can be used as the ferromagnetic material. The electromagnetic soft iron contains 95% or more of pure iron, preferably about 99% or more (rounded to the first decimal place and 99% or more). used.

  By the way, an edge portion 61 having a right-angled triangular cross section is formed at the rear end of the end portion 19 as a suction portion, and the outer peripheral surface of the edge portion 61 is tapered. The outer diameter of the edge portion 61 is the largest at the front end, and becomes smaller toward the rear, and is made equal to the inner diameter of the separation portion 33 at the rear end of the edge portion 61. In this case, since the edge 61 is tapered toward the rear, magnetic saturation occurs at the edge 61.

  On the other hand, a receiving portion 32a surrounding the edge portion 61 is formed at a rear end portion (right end portion in FIG. 1) of the second surrounding portion 32, and an inner peripheral surface of the receiving portion 32a is formed in a tapered shape. The The inner diameter of the accommodating portion 32a is the largest at the front end, and becomes smaller toward the rear, and is made equal to the inner diameter of the separating portion 33 at the rear end of the accommodating portion 32a.

  In the present embodiment, the outer peripheral surface of the edge portion 61 and the inner peripheral surface of the accommodating portion 32a are tapered, but the outer peripheral surface and the inner peripheral surface are curved in a convex shape or a concave shape, or different. A multi-step inclined surface with an inclination angle may be used.

  On the other hand, the pressure regulating valve portion 12 is snapped to the valve main body 62, the spool 26 fitted to the valve main body 62 so as to be movable back and forth, and the front end of the valve main body 62, and the spool 26 is prevented from coming out of the valve main body 62. As an urging member that is disposed between the end plate 64 for preventing prevention and between the end plate 64 and the front end of the spool 26 and urges the spool 26 toward the solenoid portion 51 with a predetermined spring load. At the rear end of the spring 44 and the spool 26, a diaphragm dp is provided extending radially outward and separating the solenoid 51 side and the pressure regulating valve 12 side.

  The spool 26 is formed at the front end, and is formed with a spring seat 60 inserted into the spring 44, a large-diameter land 66 formed adjacent to the rear of the spring seat 60, and adjacent to the rear of the land 66. A small-diameter groove 67, a large-diameter land 68 formed adjacent to the rear of the groove 67, a small-diameter groove 69 formed adjacent to the rear of the land 68, and adjacent to the rear of the groove 69. And a small-diameter plunger abutting portion 72 formed adjacent to the rear of the land 71. The inner peripheral edge of the diaphragm dp is attached between the land 71 and the plunger abutting portion 72.

  The valve body 62 includes an input port p1 to which an input pressure supplied from a modulator valve (not shown) is supplied, an output port p2 for outputting an output pressure to the control valve, a sealed feedback port p3, and a drain port p4. The feedback port p3 is communicated with the output port p2 via a feedback oil passage (not shown), and the output pressure is supplied as a feedback pressure to generate an urging force corresponding to the area difference between the lands 68 and 71. The spool 26 is urged forward by the urging force. A notch k is formed in the input port p1. Filters f1 and f2 are disposed at the input port p1 and the output port p2 so that foreign matter does not enter the valve body 62.

  Therefore, the spool 26 receives the thrust force from the plunger 14, the spring load of the spring 44, and the feedback force due to the feedback pressure, and advances and retreats integrally with the plunger 14 in a state where the plunger contact portion 72 is in contact with the plunger 14. Be made.

  Thus, since the plunger 14 is directly supported by the core 34, it is not necessary to dispose the stator core radially inward from the coil 17 as in the prior art. Therefore, not only can the solenoid unit 51 be reduced in size, but also the number of turns of the winding 16 can be increased and the magnetomotive force can be increased.

  Next, the operation of the linear solenoid valve 10 having the above configuration will be described.

  When the contact portion 27 and the bottom portion 56 are brought into contact with each other in the initial position of the plunger 14, that is, in the non-operating state, and a current is supplied to the coil 17 through the terminal tm, a magnetic flux is generated. Since it is formed of a non-magnetic material, the current bypasses the bobbin 15, and a magnetic path is formed from the yoke 20 through the end portion 18, the plunger 14 and the end portion 19 to the yoke 20 in this order. Along with this, an attracting portion is formed between the edge portion 61 and the plunger 14 in the magnetic path.

  In this case, a gap is formed between the rear end surface of the plunger 14 and the yoke 20 as much as the contact portion 27 is formed, and the surface of the contact portion 27 is subjected to surface treatment. Since a coating layer (not shown) made of a magnetic material is formed, magnetic flux does not leak from the rear end of the plunger 14. Further, since the gap between the inner peripheral surface of the end portions 18 and 19 and the outer peripheral surface of the plunger 14 is sufficiently reduced, the magnetic resistance of the magnetic path can be reduced.

  And the coil 17 attracts | sucks the plunger 14 with predetermined | prescribed suction | attraction force, generates a thrust to the plunger 14, and puts the plunger 14 in an operation state. As a result, the thrust is transmitted to the spool 26 together with the feedback pressure against the spring load by the spring 44, the pressure regulating valve portion 12 is operated, and the spool 26 is advanced. In this case, based on the stroke amount of the plunger 14, the spool 26 is advanced integrally with the plunger 14 against the spring load, and the position of the spool 26 is controlled. Thereby, the distribution ratio between the input port p1 and the drain port p4 is controlled, the hydraulic pressure is linearly adjusted, and the adjusted hydraulic pressure is output as the output pressure from the output port p2.

  By the way, as the plunger 14 is advanced and retracted in the core 34, the oil at the cylinder head flows backward through the oil passage 30 or the oil at the bottom of the cylinder passes through the oil passage 30 as described above. However, since the hollow portion 22 is closed by the diaphragm dp at the cylinder head, the flow of oil in the oil passage 30 is restricted, and when the plunger 14 is advanced, the cylinder bottom is A sufficient amount of oil cannot be supplied, or when the plunger 14 is retracted, the oil at the bottom of the cylinder cannot be sufficiently discharged. In this case, if the foreign matter that has entered the bottom of the cylinder enters, for example, between the core 34 and the plunger 14 by the pumping action, a stick is generated in the linear solenoid valve 10.

  Therefore, in the present embodiment, when the plunger 14 is advanced, in addition to sending the oil at the cylinder head to the cylinder bottom via the oil passage 30, the oil outside the linear solenoid valve 10 is caused to flow into the cylinder bottom. When a sufficient amount of oil is supplied to the cylinder bottom and the plunger 14 is retracted, the cylinder bottom oil is sent to the cylinder head via the oil passage 30, and the cylinder bottom oil is supplied to the linear solenoid valve. 10 so that the oil at the bottom of the cylinder can be sufficiently discharged.

  Therefore, in the present embodiment, the first oil outflow extending in the radial direction in order to allow oil to flow into or out of the cylinder bottom between the notch 58 and the terminal tm. An inlet portion h1 is formed, and a first oil passage is formed between the first oil inflow / outflow portion h1 and the cylinder bottom portion.

  The first oil passage is formed in communication with the first oil inflow / outflow portion h1, and is formed in communication with the flow path m1 extending in the axial direction and in the radial direction and in the circumferential direction. The channel m2 is formed in communication with the channel m2 and the bottom of the cylinder, and is provided in at least two locations in the circumferential direction and includes a channel m3 extending in the axial direction. The flow path m1 forms a first axial flow path, the flow path m2 forms a first circumferential flow path, and the flow path m3 forms a second axial flow path.

  The flow path m1 is formed with a predetermined width and a predetermined depth in a portion (a lower end portion in FIGS. 1 and 2) corresponding to the terminal tm in the circumferential direction on the inner peripheral surface of the cylindrical portion 55. A closed space composed of the one groove formed and the outer peripheral surface of the coil 17 (the outer peripheral surface of the bobbin 15). The front end is communicated with the first oil inflow / outflow portion h1 at the rear end of the notch 58, and the rear end is The rear end of the coil 17 communicates with the flow path m2. The width and depth dimensions of the groove are set sufficiently small so that the cross-sectional area of the magnetic path formed in the yoke 20 does not become small.

  The flow path m2 includes an annular groove formed at a predetermined depth along a portion of the front end surface of the corner portion 57 facing the coil 17, and a rear end surface of the coil 17 (rear end surface of the bobbin 15). The outer peripheral edge communicates with the flow path m1 at a portion corresponding to the terminal tm in the circumferential direction, and the inner peripheral edge communicates with the flow path m3 in the entire circumferential direction. In addition, since the flow path m2 is formed over the entire circumferential direction, it is a gap (clearance) in the axial direction. Therefore, a projection 82 is formed at the rear end of the bobbin 15 toward the bottom 56 so that the coil 17 does not move in the axial direction when receiving an external force, and the tip of the projection 82 is the front end of the bottom 56. It is brought into contact with the surface. The protrusion 82 is formed at a predetermined location in the circumferential direction, and is also used for positioning the coil 17 when the linear solenoid valve 10 is assembled.

  In addition, the flow path m3 is formed at a plurality of locations in the circumferential direction of the inner peripheral surface of the cylindrical portion 55, in this embodiment, at two locations, and is a groove extending in the axial direction, and an outer peripheral surface of the core 34. This is a closed space composed of (the outer peripheral surface of the end portion 18), and the front end communicates with the oil passage m <b> 2 at the rear end of the coil 17, and the rear end communicates with the cylinder bottom at the rear end of the core 34.

  In the linear solenoid valve 10 having the above-described configuration, when the plunger 14 is moved forward, the oil at the cylinder head is sent to the cylinder bottom via the oil passage 30, and the oil outside the linear solenoid valve 10 is fed into the first oil inflow / outflow part. It enters the flow channel m1 through h1, flows backward through the flow channel m1, and enters the flow channel m2 from the rear end of the flow channel m1. The flow path m1 is formed at a location corresponding to the terminal tm in the circumferential direction, whereas the flow path m2 is formed in an annular shape, so that the oil that has entered the flow path m2 branches to the left and right, The arc-shaped flow path m2 flows upward and merges at the upper end. The oil that has entered the flow path m2 not only flows upward, but also enters the flow path m3, flows backward through the flow path m3, and enters the cylinder bottom from the rear end of the flow path m3. .

  In this way, the oil outside the linear solenoid valve 10 is caused to flow into the cylinder bottom through the first oil passage.

  Further, when the plunger 14 is retracted, the oil at the bottom of the cylinder is sent to the cylinder head via the oil path 30, and the oil at the bottom of the cylinder flows in the opposite direction in the first oil path. It is caused to flow out of the solenoid valve 10.

  Thus, in the present embodiment, since the first oil passage is formed, when the plunger 14 is advanced and retracted, a sufficient amount of oil can be supplied to and discharged from the bottom of the cylinder, and the plunger 14 It can be advanced and retracted smoothly. The oil that has entered the flow path m2 branches right and left and flows upward, and at least two places in the circumferential direction, in this embodiment, the terminal tm side and the opposite side (180 [°] apart) 2), the fluid enters the flow path m3 and is supplied to the cylinder bottom, so that a further sufficient amount of oil can be supplied to and discharged from the cylinder bottom. Therefore, as shown in FIG. 3, the responsiveness of the linear solenoid valve 10 can be improved. In this case, the responsiveness is represented by the time until the movement of the amount of oil corresponding to the movement of the plunger 14 (volume change amount) is completed when the plunger 14 is moved.

  Further, in the present embodiment, the flow channel m1 is formed in the axial direction, communicated with the flow channel m2 at the rear end of the flow channel m1, and the flow channel m2 is formed in an annular shape. Since the flow path m2 is communicated with the flow path m3 in at least two places, the first oil path can be lengthened. Accordingly, it becomes difficult for the foreign matter that has entered from the first oil inflow / outflow portion h1 to reach the bottom of the cylinder, so that sticking can be prevented from occurring in the linear solenoid valve 10.

  Moreover, since the flow paths m1 to m3 are constituted by grooves formed in the yoke 20, it is not necessary to increase the size of the solenoid portion 51 in order to form the first oil passage. Therefore, the linear solenoid valve 10 can be reduced in size.

  Further, since the contact portion 27 is formed, the flow paths m1 to m3 and the cylinder bottom portion are communicated at all times, that is, regardless of whether the plunger 14 is placed in the non-operating state or the operating state. Therefore, the responsiveness of the linear solenoid valve 10 when the plunger 14 changes from the non-operating state to the operating state can be increased.

  By the way, the core 34 is normally assembled to the yoke 20 by press-fitting the rear end into the inner peripheral surface of the corner portion 57 and the front end into the inner peripheral surface of the caulking portion 80. In the present embodiment, since the flow channel m3 is formed in the press-fitted portion, it is not necessary to add an extra structure to form the flow channel m3. Therefore, the cost of the linear solenoid valve 10 can be reduced.

  Further, since the flow path m3 is formed symmetrically on the terminal tm side and the opposite side, the yoke 20 can be pulled out without applying stress to the mold when the yoke 20 is formed by cold forging. . Therefore, the lifetime of the mold can be extended.

  Next, a second embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 4 is a sectional view of a linear solenoid valve according to the second embodiment of the present invention, and FIG. 5 is a sectional view taken along line BB in FIG.

  In this case, the first oil passage is formed in communication with the first oil inflow / outflow portion h1, and is formed in communication with the flow path m1 extending in the axial direction and the flow path m1 in the radial direction and the circumferential direction. The flow path m2 that extends and the flow path m13 that is formed in communication with the flow path m2 and the bottom of the cylinder at at least two locations in the circumferential direction and that extends in the axial direction are provided. The flow path m1 forms a first axial flow path, the flow path m2 forms a first circumferential flow path, and the flow path m13 forms a second axial flow path.

  The flow path m1 is a closed space composed of one groove formed on the inner peripheral surface of the cylindrical portion 55 and the outer peripheral surface of the coil 17, as in the first embodiment. Similarly to the first embodiment, an annular groove formed at a predetermined depth along a portion facing the coil 17 on the front end surface (left end surface in FIG. 4) of the corner portion 57, and the coil 17 It is a closed space consisting of a rear end face (right end face in FIG. 4).

  On the other hand, the flow path m13 is a closed space composed of grooves formed in at least two locations in the circumferential direction of the outer peripheral surface of the core 34 (the outer peripheral surface of the end portion 18) and the inner peripheral surface of the corner portion 57. The front end (left end in FIG. 4) communicates with the oil passage m2 at the rear end (right end in FIG. 4) of the coil 17, and the rear end communicates with the cylinder bottom at the rear end of the core 34.

  In the linear solenoid valve 10 having the above-described configuration, when the plunger 14 is moved forward (moved leftward in FIG. 4), the oil at the cylinder head is sent to the cylinder bottom via the oil passage 30, and the outside of the linear solenoid valve 10 Enters the flow channel m1 through the first oil inflow / outflow portion h1, flows backward through the flow channel m1, and enters the flow channel m2 from the rear end of the flow channel m1. The flow path m1 is formed at a location corresponding to the terminal tm in the circumferential direction, whereas the flow path m2 is formed in an annular shape, so that the oil that has entered the flow path m2 branches to the left and right, The arc-shaped flow path m2 flows upward and merges at the upper end. The oil that has entered the flow path m2 not only flows upward, but also enters the flow path m13, flows backward through the flow path m13, and enters the cylinder bottom from the rear end of the flow path m13. .

  In the first and second embodiments, the flow path m1 is a closed space including one groove formed on the inner peripheral surface of the cylindrical portion 55 and the outer peripheral surface of the coil 17. It can be formed by a gap due to a dimensional error between the inner peripheral surface of the shaped portion 55 and the outer peripheral surface of the coil 17.

  Thus, in the present embodiment, since the first oil passage is formed, when the plunger 14 is advanced and retracted (moved in the left-right direction in FIG. 4), a sufficient amount of oil is supplied to the cylinder bottom. Supply and discharge can be performed, and the plunger 14 can be advanced and retracted smoothly. In addition, the oil that has entered the flow path m2 branches right and left and flows upward, enters the flow path m13 from at least two locations in the circumferential direction, and is supplied to the bottom of the cylinder. Oil can be supplied to and discharged from the bottom of the cylinder. Therefore, the responsiveness of the linear solenoid valve 10 can be improved.

  Further, in the present embodiment, the flow channel m1 is formed in the axial direction, communicated with the flow channel m2 at the rear end of the flow channel m1, and the flow channel m2 is formed in an annular shape. Since the flow path m2 is communicated with the flow path m13 in at least two places, the first oil path between the first oil inflow / outflow portion h1 and the cylinder bottom portion can be lengthened. Accordingly, it becomes difficult for the foreign matter that has entered from the first oil inflow / outflow portion h1 to reach the bottom of the cylinder, so that sticking can be prevented from occurring in the linear solenoid valve 10.

  In addition, since the flow paths m1 and m2 are formed by grooves formed in the yoke 20, and the flow path m13 is formed by grooves formed in the core 34, the dimensions of the solenoid portion 51 in order to form the first oil passage. There is no need to increase the size. Therefore, the linear solenoid valve 10 can be reduced in size.

  Further, since the contact portion 27 is formed, the flow paths m1, m2, and m13 and the cylinder bottom portion are communicated with each other even when the plunger 14 is in an inoperative state. Therefore, the responsiveness of the linear solenoid valve 10 when the plunger 14 changes from the non-operating state to the operating state can be increased.

  Next, a third embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  6 is a sectional view of a linear solenoid valve according to a third embodiment of the present invention, FIG. 7 is a sectional view taken along the line CC in FIG. 6, and FIG. 8 is a sectional view taken along the line DD in FIG.

  In this case, the first oil passage is formed so as to communicate with the first oil inflow / outflow portion h1, and the flow path m1 extending in the axial direction, the flow path m2 formed so as to communicate with the flow path m1, and extending in the radial direction. And a flow path m23 formed in communication with the flow path m2 and the bottom of the cylinder and extending in the axial direction at at least one place in the circumferential direction. The flow path m1 forms a first axial flow path, the flow path m2 forms a first circumferential flow path, and the flow path m23 forms a second axial flow path.

  The flow path m1 is a closed space composed of one groove formed on the inner peripheral surface of the cylindrical portion 55 and the outer peripheral surface of the coil 17, as in the first embodiment. Similar to the first embodiment, an annular groove formed at a predetermined depth along a portion facing the coil 17 on the front end surface (left end surface in FIG. 6) of the corner portion 57, and the corner portion 57. It is a closed space consisting of the front end face.

  On the other hand, the flow path m23 has one groove formed on the outer peripheral surface of the core 34 on the side opposite to the flow path m1 (side separated by 180 °) and the outer periphery of the first surrounding portion 31. The front end (left end in FIG. 6) is in communication with the oil passage m2 at the rear end of the coil 17, and the rear end (right end in FIG. 6) is the bottom of the cylinder at the rear end of the core 34. Communicated.

  By the way, in the present embodiment, a second oil passage is provided in parallel with the first oil passage so that the oil outside the linear solenoid valve 10 can be stably supplied to and discharged from the cylinder bottom. It is formed.

  Therefore, in the notch 58, the second oil inflow / outflow portion on the opposite side of the first oil inflow / outflow portion h1 across the holding portion 84 of the terminal tm, that is, on the front side (left side in FIG. 6) from the holding portion 84. h2 is formed, and a second oil passage is formed between the second oil inflow / outflow portion h2 and the cylinder bottom portion.

  The second oil passage is formed in communication with the second oil inflow / outflow portion h2, and is formed in communication with the flow path m21 extending in the radial direction and the circumferential direction, and the flow path m21 and the flow path m2. And a flow path m22 extending in the axial direction. The flow path m21 forms a second circumferential flow path, and the flow path m22 forms a third axial flow path.

  The flow path m21 is an annular groove formed at a predetermined depth along the portion facing the coil 17 on the rear end surface (the right end surface in FIG. 6) of the end portion 19 constituting the flange portion of the core 34, And a closed space consisting of the front end face of the coil 17 (front end face of the bobbin 15), and the outer peripheral edge communicates with the second oil inflow / outflow portion h2 at a portion corresponding to the terminal tm in the circumferential direction, and the terminal tm And on the opposite side (a side separated by 180 [°]), it is communicated with the flow path m22.

  In addition, the flow path m22 has a predetermined width and a predetermined depth at a portion (upper end portion in FIGS. 6 to 8) on the inner circumferential surface of the cylindrical portion 55 on the side opposite to the terminal tm in the circumferential direction. Is a closed space composed of one groove formed in the outer periphery of the coil 17 and the outer peripheral surface of the coil 17 (the outer peripheral surface of the bobbin 15), and the front end communicates with the second oil inflow / outflow portion h2 at the rear end of the end portion The rear end is communicated with the flow path m <b> 2 at the rear end of the coil 17. The width and depth dimensions of the groove are set sufficiently small so that the cross-sectional area of the magnetic path formed in the yoke 20 does not become small.

  In the linear solenoid valve 10 having the above-described configuration, when the plunger 14 is moved forward (moved leftward in FIG. 6), the oil at the cylinder head is sent to the cylinder bottom via the oil passage 30, and the oil outside the linear solenoid valve 10 is supplied. Is sent to the bottom of the cylinder via the first oil passage, and oil outside the linear solenoid valve 10 enters the flow path m21 via the second oil inflow / outflow portion h2. The flow path m21 is formed in an annular shape, and the second oil inflow / outflow portion h2 is formed on the terminal tm side in the circumferential direction, whereas the flow path m22 is formed on the opposite side to the terminal tm. Therefore, the oil that has entered the flow path m21 branches right and left, flows upward in the arc-shaped flow path m21, joins at the upper end, and then enters the flow path m22.

  Subsequently, the oil flows backward in the flow channel m22, enters the flow channel m2 from the rear end of the flow channel m22, and further enters the flow channel m23, and then enters the cylinder bottom from the rear end of the flow channel m23. Enter.

  In this way, the oil outside the linear solenoid valve 10 is caused to flow into the cylinder bottom through the second oil passage.

  Further, when the plunger 14 is moved backward (moved rightward in FIG. 6), the oil at the bottom of the cylinder is sent to the cylinder head via the oil passage 30, and the oil at the bottom of the cylinder is opposite to the first oil path. In addition to being flown out of the linear solenoid valve 10, it flows in the opposite direction of the second oil passage and is flowed out of the linear solenoid valve 10.

  As described above, in the present embodiment, the first and second oil passages are formed. Therefore, when the plunger 14 is advanced and retracted (moved in the left-right direction in FIG. 6), a more sufficient amount of oil is supplied to the cylinder. It is possible to supply and discharge with respect to the bottom, and not only can the plunger 14 be smoothly advanced and retracted, but also the responsiveness of the linear solenoid valve 10 can be improved.

  In the present embodiment, as described above, not only the first oil passage can be lengthened, but also the flow passage m21 is formed in an annular shape and communicated with the flow passage m22 at the upper end of the flow passage m21. Therefore, the second oil passage between the second oil inflow / outflow portion h2 and the cylinder bottom portion can be lengthened. Therefore, it becomes difficult for the foreign matter that has entered from the second oil inflow / outflow portion h2 to reach the bottom of the cylinder, so that the sticking of the linear solenoid valve 10 can be further prevented.

  In addition, since the flow path m21 is constituted by a groove formed in the end portion 19 and the flow paths m2, m22, m23 are constituted by grooves formed in the yoke 20, the first and second oil paths are formed. In addition, it is not necessary to increase the size of the solenoid portion 51. Therefore, the linear solenoid valve 10 can be reduced in size.

  Next, a fourth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 3rd Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  9 is a cross-sectional view of a linear solenoid valve according to a fourth embodiment of the present invention, FIG. 10 is a cross-sectional view taken along line EE in FIG. 9, and FIG. 11 is a cross-sectional view taken along line FF in FIG.

  In this case, the first oil passage is formed in communication with the first oil inflow / outflow portion h1, as in the second embodiment, and is connected to the flow channel m1 extending in the axial direction and the flow channel m1. A channel m2 formed and extending in the radial direction and the circumferential direction, and a channel m13 formed in communication with the channel m2 and the bottom of the cylinder at at least one location in the circumferential direction and extending in the axial direction are provided. The flow path m1 forms a first axial flow path, the flow path m2 forms a first circumferential flow path, and the flow path m13 forms a second axial flow path.

  Similarly to the third embodiment, the second oil passage is formed in communication with the second oil inflow / outflow portion h2, and has a flow path m21 extending in the radial direction and the circumferential direction, and the flow path m21. And a flow path m22 formed in communication with the flow path m2 and extending in the axial direction. The flow path m21 forms a second circumferential flow path, and the flow path m22 forms a third axial flow path.

  Next, a fifth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 12 is a longitudinal sectional view showing a main part of a linear solenoid valve according to the fifth embodiment of the present invention, and FIG. 13 is a sectional view taken along the line GG in FIG.

  In this case, an oil sump (outer periphery oil sump) 70 formed of an annular recess is formed on the outer peripheral edge of the rear end of the corner portion 57 so as to communicate with the flow path m3. The oil reservoir 70 comprises a groove formed with a predetermined depth with the inner peripheral surface of the corner portion 57 facing radially outward.

  When the linear solenoid valve 10 is mounted horizontally with respect to the automatic transmission case, the oil sump 70 enters the bottom of the cylinder of the yoke 20 and accommodates foreign matter that has settled to the lowermost end due to gravity. For this purpose, the inner peripheral surface of the oil sump 70 is placed radially outward from the bottom of the groove forming the flow path m3.

  Next, a sixth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 2nd Embodiment, the same code | symbol is provided and the effect of the embodiment is used about the effect of the invention by having the same structure.

  FIG. 14 is a cross-sectional view of a linear solenoid valve according to the sixth embodiment of the present invention.

  In this case, an oil sump 70 formed of an annular recess is formed on the outer peripheral edge of the rear end of the corner portion 57 so as to communicate with the flow path m13. The oil sump 70 is configured so that the linear solenoid valve 10 is attached to the automatic transmission case. On the other hand, when it is mounted horizontally, it enters the bottom of the cylinder of the yoke 20 and accommodates foreign matter that has settled to the lowermost end due to gravity.

  Next, a seventh embodiment of the present invention will be described. In addition, about the thing which has the same structure as 2nd Embodiment, the same code | symbol is provided and the effect of the embodiment is used about the effect of the invention by having the same structure.

  FIG. 15 is a view showing a cylinder bottom portion of a linear solenoid valve according to a seventh embodiment of the present invention.

  In this case, a bulge 75 having an arc shape is formed on the bottom of the cylinder so as to protrude from the bottom 56 radially inward from the corner 57 and radially outward from the contact portion 27. The height of the raised portion 75 is equal to that of the contact portion 27. The oil reservoir 70 is formed between the raised portion 75 and the corner portion 57, and the annular groove d1 is formed between the raised portion 75 and the contact portion 27. The oil reservoir 70 and the groove d1 are On the side opposite to the terminal tm (FIG. 4) in the circumferential direction (side away from 180 [°]), the terminal is communicated by a communication part e1 formed with a predetermined width. The oil reservoir 70, the groove d1, and the communication portion e1 form first and second bottom flow paths that communicate with each other at the communication portion e1 when the rear end portion of the plunger 14 contacts the contact portion 27 and the raised portion 75. To do. In addition to the contact portion 27, the surface of the raised portion 75 is subjected to a surface treatment to form an outer layer made of a nonmagnetic material.

  Therefore, since the oil reservoir 70 is formed, the foreign matter that has entered the cylinder bottom can be accommodated.

  Moreover, since the contact part 27 and the protruding part 75 are formed, the flow paths m1 to m3 and the cylinder bottom part are communicated with each other at all times, that is, even when the plunger 14 is placed in the non-operating state or the operating state. Therefore, the responsiveness of the linear solenoid valve 10 when the plunger 14 changes from the non-operating state to the operating state can be increased.

  Next, an eighth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 7th Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 16 is a view showing a cylinder bottom portion of a linear solenoid valve according to an eighth embodiment of the present invention.

  In this case, a protruding portion 76 that protrudes from the bottom 56 and has a “U” -shaped shape at the bottom of the cylinder is radially inward from the corner 57 and radially outward from the contact portion 27. It is formed. The height of the raised portion 76 is made equal to that of the contact portion 27. An oil reservoir 70 is formed between the raised portion 76 and the corner portion 57, and an annular groove d2 is formed between the raised portion 76 and the contact portion 27. The oil reservoir 70 and the groove d2 are On the side opposite to the terminal tm (FIG. 4) in the circumferential direction (side away from 180 [°]), the terminal tm is communicated by a communication portion e2 formed with a predetermined width.

  Next, a ninth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 3rd Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 17 is a cross-sectional view of a linear solenoid valve according to the ninth embodiment of the present invention.

  In this case, an oil sump 70 composed of an annular recess is formed on the outer peripheral edge of the rear end of the corner portion 57 so as to communicate with the flow path m23, and the linear solenoid valve 10 is attached to the automatic transmission case. On the other hand, when it is mounted horizontally, it enters the bottom of the cylinder of the yoke 20 and accommodates foreign matter that has settled to the lowermost end due to gravity.

  Next, a tenth embodiment of the present invention will be described. In addition, about the thing which has the same structure as 3rd Embodiment, the same code | symbol is provided and the effect of the same embodiment is used about the effect of the invention by having the same structure.

  FIG. 18 is a view showing a cylinder bottom portion of a linear solenoid valve according to a tenth embodiment of the present invention.

  In this case, a protruding portion 77 having an arc shape is formed on the bottom portion of the cylinder so as to protrude from the bottom portion 56 inward in the radial direction from the corner portion 57 and outward in the radial direction from the contact portion 27. The height of the raised portion 77 is equal to that of the contact portion 27. An oil reservoir 70 is formed between the raised portion 77 and the corner portion 57, and an annular groove d3 is formed between the raised portion 77 and the contact portion 27. The oil reservoir 70 and the groove d3 are On the terminal tm (FIG. 6) side in the circumferential direction, communication is made by a communication portion e3 formed with a predetermined width. The oil reservoir 70, the groove d3, and the communication portion e3 form first and second bottom flow paths that communicate with each other at the communication portion e3 when the rear end portion of the plunger 14 contacts the contact portion 27 and the raised portion 77. To do. In addition to the contact portion 27, the surface of the raised portion 77 is subjected to a surface treatment to form an outer layer made of a nonmagnetic material.

  Therefore, since the oil reservoir 70 is formed, the foreign matter that has entered the cylinder bottom can be accommodated.

  Next, an eleventh embodiment of the present invention will be described. In addition, about the thing which has the same structure as 10th Embodiment, the same code | symbol is provided and the effect of the embodiment is used about the effect of the invention by having the same structure.

  FIG. 19 is a view showing a cylinder bottom portion of a linear solenoid valve in an eleventh embodiment of the present invention.

  In this case, a protruding portion 78 that protrudes from the bottom portion 56 and has a “U” shape is formed on the bottom of the cylinder, radially inward from the corner portion 57 and radially outward from the contact portion 27. It is formed. The height of the raised portion 78 is made equal to that of the contact portion 27. An oil reservoir 70 is formed between the raised portion 78 and the corner portion 57, and an annular groove d4 is formed between the raised portion 78 and the contact portion 27. The oil reservoir 70 and the groove d4 are On the terminal tm (FIG. 6) side in the circumferential direction, communication is made by a communication portion e4 formed with a predetermined width.

  In each of the above embodiments, the linear solenoid valve 10 has been described. However, the present invention can be applied to other solenoid valves.

  The present invention is not limited to the above embodiments, and various modifications can be made based on the gist of the present invention, and they are not excluded from the scope of the present invention.

It is sectional drawing of the linear solenoid valve in the 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is a figure explaining the responsiveness of the linear solenoid valve in the 1st Embodiment of this invention. It is sectional drawing of the linear solenoid valve in the 2nd Embodiment of this invention. It is BB sectional drawing of FIG. It is sectional drawing of the linear solenoid valve in the 3rd Embodiment of this invention. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is sectional drawing of the linear solenoid valve in the 4th Embodiment of this invention. It is EE sectional drawing of FIG. It is FF sectional drawing of FIG. It is a longitudinal cross-sectional view which shows the principal part of the linear solenoid valve in the 5th Embodiment of this invention. It is GG sectional drawing of FIG. It is a cross-sectional view of the linear solenoid valve in the 6th Embodiment of this invention. It is a figure which shows the cylinder bottom part of the linear solenoid valve in the 7th Embodiment of this invention. It is a figure which shows the cylinder bottom part of the linear solenoid valve in the 8th Embodiment of this invention. It is a cross-sectional view of the linear solenoid valve in the 9th Embodiment of this invention. It is a figure which shows the cylinder bottom part of the linear solenoid valve in the 10th Embodiment of this invention. It is a figure which shows the cylinder bottom part of the linear solenoid valve in the 11th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Linear solenoid valve 12 Pressure regulation valve part 14 Plunger 15 Bobbin 16 Winding 17 Coil 20 Yoke 22 Hollow part 27 Contact part 34 Core 55 Cylindrical part 56 Bottom part 57 Corner part dp Diaphragm h1, h2 1st, 2nd oil Inflow / outflow portions m1 to m3, m13, m21 to m23

Claims (15)

  A coil formed by winding a winding around a bobbin, a core disposed adjacent to the coil, a yoke disposed so as to surround the coil and the core, and radially inward from the core And is formed slidably with respect to the inner peripheral wall of the hollow portion formed on the side, and has a cylinder head at the front and a plunger that forms the cylinder bottom at the rear, and is formed at a predetermined portion of the yoke. An oil passage for supplying and discharging oil outside the solenoid valve to and from the bottom of the cylinder is formed between the oil inflow / outflow portion and the bottom of the cylinder, and the oil passage includes an inner peripheral surface of the yoke and an outer periphery of the coil A first axial flow path that extends in the axial direction and communicates with the first axial flow path and extends in the circumferential direction between the surface and the oil inflow / outflow portion. Formed between the flow path and the inner peripheral surface of the yoke and the outer peripheral surface of the core, At least at two points, extends in the axial direction, a solenoid driving device, characterized in that it comprises the circumferential flow path and the cylinder bottom part and a second axial flow passage is communicated with the.   The solenoid drive device according to claim 1, wherein the yoke includes a cylindrical portion, a bottom portion, and a corner portion, and the circumferential flow path is formed between the corner portion and the coil.   The solenoid drive device according to claim 1, wherein the oil that has entered the circumferential flow path branches to the left and right and flows.   2. The projection according to claim 1, wherein a protrusion is formed on one of the bottom of the yoke and the plunger, and the second axial flow path and the cylinder bottom are always in communication with each other in at least two locations of the circumferential flow path. Solenoid drive.   A coil formed by winding a winding around a bobbin, a core disposed adjacent to the coil, a yoke disposed so as to surround the coil and the core, and radially inward from the core And is formed slidably with respect to the inner peripheral wall of the hollow portion formed on the side, and has a cylinder head at the front and a plunger that forms the cylinder bottom at the rear, and is formed at a predetermined portion of the yoke. First and second oil passages for supplying and discharging oil outside the solenoid valve to and from the cylinder bottom are formed between the first and second oil inflow / outflow parts and the cylinder bottom. The first oil passage is formed between the inner peripheral surface of the yoke and the outer peripheral surface of the coil so as to communicate with the first oil inflow / outflow portion, and extends in the axial direction. A circumferential flow path that extends in the circumferential direction, and an inner circumferential surface of the yoke; Formed between the outer circumferential surface of the A, extend axially, a solenoid driving device, characterized in that it comprises the circumferential flow path and the cylinder bottom part and a second axial flow passage is communicated.   The solenoid driving device according to claim 5, wherein the second oil inflow / outflow portion is formed closer to the pressure regulating valve portion than the first oil inflow / outflow portion.   The second oil passage communicates with the second oil inflow / outflow portion, a circumferential flow path formed between the flange portion of the core and the coil, and an inner peripheral surface of the yoke and an outer periphery of the coil The solenoid drive device according to claim 5, further comprising an axial flow path formed between the surface and extending in the axial direction.   The solenoid drive device according to claim 7, wherein the first axial flow path of the first oil passage and the axial flow path of the second oil passage are formed on opposite sides in the circumferential direction.   The solenoid driving device according to any one of claims 1 to 8, wherein the cylinder head is sealed by a separating member.   The solenoid drive device according to any one of claims 1 to 9, wherein a groove is formed in the yoke to form the oil passage.   The solenoid drive device according to any one of claims 1 to 9, wherein a groove is formed in the core to form the oil passage.   The solenoid drive device according to claim 1, wherein the oil passage is formed by a clearance due to a dimensional error of the yoke and the core.   The solenoid drive device according to any one of claims 1 to 12, wherein an oil sump is formed by a groove formed in a radially outward direction at the bottom of the cylinder.   The solenoid drive device according to claim 13, wherein the oil reservoir is formed in communication with the second axial flow path.   A coil formed by winding a winding around a bobbin, a core disposed adjacent to the coil, a yoke disposed so as to surround the coil and the core, and radially inward from the core And a plunger which is slidably disposed with respect to the inner peripheral wall of the hollow portion formed on the side, and which has a cylinder head at the front and a cylinder bottom at the rear, and a hydraulic pressure adjusted as the plunger advances and retreats And a pressure regulating valve portion that outputs as an output pressure, and between the oil inflow / outflow portion formed at a predetermined portion of the yoke and the cylinder bottom portion, oil outside the solenoid valve is supplied to and discharged from the cylinder bottom portion. An oil passage is formed between the inner peripheral surface of the yoke and the outer peripheral surface of the coil, and is formed in communication with the oil inflow / outflow portion and extends in the axial direction. A flow path, in communication with the first axial flow path, extending in a circumferential direction The circumferential flow path, the inner circumferential surface of the yoke and the outer circumferential surface of the core, and extending in the axial direction at at least two locations in the circumferential direction. A solenoid valve comprising a second axial flow path communicated.

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