JP7068306B2 - Solenoid valve - Google Patents

Description

The present invention relates to a solenoid valve, particularly a immersion type solenoid valve used for hydraulic pressure control of a hydraulic pressure circuit.

As a conventional solenoid valve for hydraulic pressure (hydraulic pressure) control, a valve part having a spool housed in a sleeve, a plunger (movable iron core) for driving the spool in the axial direction, and a solenoid molded body in which a coil is covered with resin. A solenoid part having a solenoid case for accommodating a valve, which is arranged between the pressure source of a pump or an accumulator and the load side, and has a control oil whose pressure and flow rate are adjusted by driving a spool to the load side. It can be supplied.

By the way, since the spool has a relatively large drive stroke, when the solenoid portion is driven, the hydraulic oil in the internal space of the accommodating member accommodating the plunger may become a resistance and hinder the rapid movement of the plunger. Therefore, in the conventional oil-immersed solenoid valve, an opening (hereinafter, also referred to as a breathing hole) that communicates with the outside is provided, and the internal space of the accommodating member and the opening are communicated with each other to communicate the hydraulic oil inside the accommodating member. It is necessary to deal with the resistance caused by the hydraulic oil by discharging the hydraulic oil in the moving direction of the plunger by breathing it to the outside.

The oil-immersed solenoid valve disclosed in Patent Document 1 is mainly composed of a spool valve portion (valve portion) and a solenoid portion, and the solenoid portion includes a plunger having a communication hole penetrating in the axial direction. A cylindrical stator core (accommodating member) for accommodating a plunger, a solenoid molded body provided on the outer periphery of the stator core and having a coil, and a yoke (solenoid case) for accommodating the stator core and the solenoid molded body and forming a magnetic circuit are provided. are doing. The yoke has a two-stage stepped tubular structure consisting of a yoke tubular portion that accommodates the solenoid molded body and a ring core tubular portion into which the stator core is fitted on the rear side of the yoke tubular portion. A circular recess is provided at the bottom of the ring core, and at least one internal respiratory path extending radially so as to communicate with the recess provided at the bottom is formed on the inner wall of the ring core cylinder. Further, on the inner wall of the yoke tube, an external breathing path is formed which is continuous with the internal breathing path of the ring core tube and has a breathing hole open to the outside of the yoke. According to this, the space formed before and after the plunger housed in the cylindrical stator core is breathably communicated with the outside through the communication hole of the plunger, the internal breathing path and the external breathing path, and is connected to the stator core. By breathing hydraulic fluid from the outside of the yoke as the plunger moves inside, hydraulic control can be performed accurately and quickly.

Japanese Unexamined Patent Publication No. 2007-1549447 (Page 4, Fig. 1)

However, in the solenoid valve of Patent Document 1, when it is mounted horizontally with respect to the hydraulic control unit (attached member), the oil level of the hydraulic oil in the hydraulic control unit drops or the oil level temporarily tilts. As a result, the hydraulic oil is discharged from the rear side (ring core cylinder side) of the stator core, the oil level of the hydraulic oil inside the stator core is lowered, the operability of the plunger deteriorates, and the hydraulic control becomes unstable. There was a risk.

The present invention has been made focusing on such a problem, and an object of the present invention is to provide a solenoid valve capable of stably performing hydraulic pressure control.

In order to solve the above problems, the solenoid valve of the present invention is used.
With spool
A sleeve in which the spool is arranged so as to be movable in the axial direction,
A movable iron core arranged on one end side of the spool and moving the spool,
A solenoid molded body arranged on the outer circumference of the movable iron core and
A solenoid case for accommodating the movable iron core and the solenoid molded body,
A cylinder for accommodating the movable iron core is provided in the inner space.
An immersion type solenoid valve that can be mounted horizontally on the member to be mounted.
The cylinder is characterized in that a weir is provided at the tip of the movable iron core on the opposite side of the spool.
According to this feature, by providing a weir at the tip of the tubular body opposite to the spool of the movable iron core, the movable iron core is provided even when the liquid level in the attached member drops or the liquid level temporarily tilts. Since the fluid inside the cylinder can be blocked by the weir provided on the opposite side of the spool, the decrease in the liquid level inside the cylinder is suppressed, the deterioration of the operability of the movable iron core is prevented, and the hydraulic pressure is controlled. Can be performed stably.

A spacer may be provided between the weir and the movable iron core to axially separate the weir and the movable iron core.
According to this, by separating the weir provided on the side opposite to the spool of the movable iron core and the movable iron core in the axial direction by a spacer, the weir and the spool of the movable iron core are separated from each other in the axial direction inside the cylinder. Since a space can be formed between the two, the fluid can be left on the side opposite to the spool of the movable iron core inside the cylinder when moving to the side opposite to the spool of the movable iron core.

The weir may be characterized by being a holder that is detachably attached to the opening of the cylinder.
According to this, since the weir is a holder that can be detachably attached to the opening of the cylinder, the maintainability inside the cylinder can be improved.

The holder may be characterized in that a fluid passage communicating with the outside of the cylinder is provided in the upper part of the surface facing the cylinder.
According to this, since the holder is provided with a fluid passage communicating with the outside of the cylinder at the upper part of the facing surface portion with the cylinder, the liquid level in the attached member is lowered or the liquid level is temporarily tilted. However, it becomes difficult for the fluid to flow out from the fluid passage of the holder, and the fluid inside the cylinder can be blocked by the holder.

The movable iron core may be characterized in that a through hole penetrating in the axial direction is provided above the center in the radial direction.
According to this, by providing a through hole extending in the axial direction above the radial center of the movable iron core, even if the liquid level in the mounted member drops or the liquid level temporarily tilts, Since the amount of fluid flowing through the through hole of the movable iron core can be suppressed inside the cylinder, it is possible to suppress the decrease in the liquid level inside the cylinder.

It may be characterized by having a positioning means for positioning the holder and the cylinder in the circumferential direction.
According to this, the holder and the cylinder can be positioned and mounted in the circumferential direction so that the fluid passage of the holder is arranged at the upper part by the positioning means, so that the fluid inside the cylinder can be reliably transferred by the holder. It can be dammed.

The sleeve is attached to the cylinder, and a rod is arranged inside the cylinder between the movable iron core and one end side of the spool.
The rod may be characterized in that it can move inside the cylinder.
According to this, the rod is arranged between the movable iron core and one end side of the spool inside the cylinder to which the sleeve is attached, and the spool side of the movable iron core becomes a space where the movement of the fluid is suppressed. , The fluid on the spool side of the movable iron core inside the cylinder is blocked, and the decrease in the liquid level inside the cylinder can be suppressed.

It is a partial notch sectional view which shows the off state of the solenoid valve in Example 1 of this invention. It is a perspective view which shows the structure of the stator in Example 1. FIG. It is a perspective view which shows the structure of the holder in Example 1. FIG. It is a partial notch sectional view which shows the on state of the solenoid valve which moves the plunger to the annular step side of a stator by energizing a coil. It is a partial notch sectional view which shows the off state of a solenoid valve in the state where the oil level in a valve housing is lowered. It is a partial notch sectional view which shows the on state of a solenoid valve in the state where the oil level in a valve housing is lowered. It is a partial notch sectional view which shows the off state of the solenoid valve in Example 2 of this invention. (A) is a perspective view showing the structure of the holder in the second embodiment, and (b) is also a side view.

An embodiment for carrying out the solenoid valve according to the present invention will be described below based on examples.

The solenoid valve according to the first embodiment will be described with reference to FIGS. 1 to 6. Hereinafter, the left side of the paper surface of FIG. 1 will be described as the upper side of the solenoid valve, and the right side of the paper surface of FIG. 1 will be described as the lower side of the solenoid valve.

The solenoid valve 1 is a spool type solenoid valve, which is used in a device controlled by hydraulic pressure, for example, an automatic transmission of a vehicle. The solenoid valve 1 is a so-called oil-immersed (liquid-immersed) solenoid valve that is horizontally attached to a member to be mounted such as a valve housing (not shown) and is immersed in the hydraulic oil L (liquid) in the valve housing. Used as. Note that FIG. 1 shows a state in which the oil level L1 is maintained at a predetermined height position in which the hydraulic oil L in the valve housing immerses the entire solenoid valve 1, and the shaded portion inside the solenoid valve 1 is shown. , Indicates the hydraulic oil L.

As shown in FIG. 1, the solenoid valve 1 is configured such that a valve portion 2 for adjusting the flow rate of a fluid as a valve is integrally attached to a solenoid portion 3 as an electromagnetic drive portion. Note that FIG. 1 shows an off state of the solenoid valve 1 in which the coil 34 of the solenoid molded body 31 is not energized.

As shown in FIG. 1, the valve portion 2 includes a sleeve 21 provided with openings such as an input port and an output port (not shown) connected to a flow path provided in a valve housing (not shown) on the outer periphery, and a sleeve 21. It is composed of a spool 22 which is liquid-tightly housed in the through hole 21a and has a plurality of lands (not shown), a coiled spring (not shown) which urges the spool 22 to the left in the axial direction, and a retainer 23 which holds the spring. Has been done. Since this configuration is well known as a spool valve, detailed description thereof will be omitted. The sleeve 21, spool 22, and retainer 23 are made of materials such as aluminum, iron, stainless steel, and resin.

Further, the sleeve 21 is configured such that the diameter of the opening 21b (opening) formed at the left end in the axial direction is larger than the diameter of the spool 22, so that the inner peripheral surface of the opening 21b and the spool inside the sleeve 21 are formed. An annular space S1 is formed between the outer peripheral surface of the 22 and the outer peripheral surface of the 22. Further, a breathing hole 21c (opening) which is a drain port penetrating in the radial direction is formed at the left end portion in the axial direction of the sleeve 21, and the breathing hole 21c is communicated with the space S1.

The solenoid unit 3 includes a cup-shaped solenoid case 30 formed of a magnetic metal material such as iron, a solenoid molded body 31 housed in the solenoid case 30, and a stator 32 arranged inside the solenoid molded body 31. It is mainly composed of (cylindrical body) and.

The solenoid case 30 is formed inside with a first accommodating cylinder portion 30b accommodating the solenoid molded body 31 and a diameter smaller than that of the first accommodating cylinder portion 30b at the center in the radial direction on the axial left side of the first accommodating cylinder portion 30b. It is configured in a cylindrical shape with a flange, which is composed of a second accommodating cylinder portion 30c into which the left end portion in the axial direction of the cylindrical portion 32a of the stator 32, which will be described later, is inserted. Further, inside the solenoid case 30, there is a radial direction between the inner peripheral surface of the first accommodating cylinder portion 30b and the second accommodating cylinder portion 30c and the outer peripheral surface of the cylindrical portion 32a of the solenoid molded body 31 and the stator 32. By separating them, the respiratory path 33 is formed.

The solenoid molded body 31 is formed by molding the coil 34 with the resin 35, and the control voltage is applied from the connector of the connector portion 35a extending to the outside from the opening 30d provided on the lower side in the radial direction of the solenoid case 30. It is designed to be supplied to the coil 34. The axial dimension of the opening 30d of the solenoid case 30 is larger than the axial dimension of the connector portion 35a of the solenoid molded body 31, and the gap with the connector portion 35a inserted through the opening 30d. A breathing path 33 formed inside the solenoid case 30 communicates with the outside via the above.

As shown in FIGS. 1 and 2, the stator 32 is formed in a cylindrical shape with a flange, and the cylindrical portion 32a and the cylindrical portion 32a in which the annular recess 32b is formed by forming the substantially central portion in the axial direction with a thin wall. It is mainly composed of a flange portion 32c extending in the radial direction at the right end portion in the axial direction of the above, and a through hole 32d capable of accommodating the plunger 4 (movable iron core) and the rod 5 in the radial center of the cylindrical portion 32a. A cylindrical protrusion 32k (positioning means) protruding vertically downward to the left in the axial direction is provided on the open end surface 32h on the left side in the axial direction of the cylindrical portion 32a, and a holder 37 (dam) is attached. The weir of the present invention is a wall portion having a space above the weir, and in the present embodiment, the disk-shaped holder 37 is a weir, and the space above the weir 37d will be described as an example. .. Further, the details of the structure of the holder 37 will be described later.

The flange portion 32c is provided with a recess 32j recessed to the left in the axial direction on the end surface on the right side in the axial direction, and is mounted and fixed in a state where the left end portion in the axial direction of the sleeve 21 is inserted. Further, the right end portion of the cylindrical portion 30a of the solenoid case 30 in the axial direction is crimped to the flange portion 32c, and the stator 32 and the holder 37 are fixed to the solenoid case 30 in the axial direction. In the off state of the solenoid valve 1, the end surface 22a on the left side in the axial direction of the spool 22 housed in the sleeve 21 comes into contact with the inner diameter side of the recess 32j, so that the movement of the spool 22 to the left in the axial direction is restricted. Has been done.

The through hole 32d constituting the space S2 in the stator 32 is formed in a first accommodating portion 32e in which the plunger 4 is arranged on the left side in the axial direction and a small diameter in the center in the radial direction on the axial right side of the first accommodating portion 32e. It is configured in a stepped cylindrical shape composed of a second accommodating portion 32f in which the rod 5 is arranged and a second accommodating portion 32f. An annular surface portion 32g extending in the radial direction is formed on the right side of the first accommodating portion 32e in the axial direction, and the annular surface portion 32g is connected orthogonally to the inner surface of the second accommodating portion 32f on the inner diameter side. The annular surface portion 32g has an annular protective member 36 formed of a rubber-like elastic body for protecting the plunger 4 from an impact at the time of contact with the axially right end surface of the plunger 4 moving axially in the first accommodating portion 32e. Is installed.

The plunger 4 is formed in a columnar shape, and its outer peripheral surface is guided by the inner peripheral surface of the first accommodating portion 32e so that it can move in the axial direction. A slight clearance is provided in the radial direction between the outer peripheral surface of the plunger 4 and the inner peripheral surface of the first accommodating portion 32e, so that the plunger 4 can move smoothly in the axial direction. .. Further, the plunger 4 is provided with a through hole 4a deviated from the center in the radial direction, and preferably is provided with a through hole 4a penetrating in the axial direction above the center in the radial direction. Further, the space S2 in the stator 32 is formed by communicating the space on the left side in the axial direction (holder 37 side) of the plunger 4 and the space on the right side in the axial direction (side of the annular surface portion 32g) of the plunger 4 by the through hole 4a. There is.

The rod 5 is arranged substantially coaxially with the plunger 4, that is, on an extension line of the center in the radial direction, and is movable in the axial direction inside the second accommodating portion 32f. A slight clearance is provided in the radial direction between the outer peripheral surface of the rod 5 and the inner peripheral surface of the second accommodating portion 32f so that the rod 5 can move smoothly in the axial direction. .. Further, the plunger 4 and the rod 5 are integrally movable, and the tip of the rod 5 on the right side in the axial direction (valve portion 2 side) is the end surface 22a on the left side in the axial direction of the spool 22 (solenoid portion 3 side). Is in contact with. The tip of the rod 5 on the right side in the axial direction and the end surface 22a of the spool 22 may be fixed.

Next, the structure of the holder 37 will be described. As shown in FIGS. 1 and 3, the holder 37 is formed in a disk shape having substantially the same diameter as the outer diameter of the cylindrical portion 32a of the stator 32, and the end surface 37a on the right side in the axial direction has an axial direction toward the inner diameter. A cylindrical convex portion 37b protruding to the right is provided. The convex portion 37b is formed to have an outer diameter substantially the same as the inner diameter of the through hole 32d (first accommodating portion 32e) of the stator 32, and the convex portion 37b can be inserted into the through hole 32d of the stator 32. Further, at the center of the convex portion 37b in the radial direction, a columnar protruding portion 37c having a diameter smaller than that of the convex portion 37b and projecting to the right in the axial direction is provided.

Further, the holder 37 is provided with a groove portion 37d (fluid passage) forming a substantially L-shape extending in the radial direction from the radial upper side of the convex portion 37b to the outer peripheral portion of the end surface 37a, and the radial lower side of the end surface 37a. Is provided with a bottomed insertion hole 37e (positioning means) formed in an outer diameter substantially the same as the outer diameter of the columnar protrusion 32k of the stator 32 described above. According to this, when the holder 37 is attached to the open end surface 32h of the stator 32, the end surface 37a of the holder 37 and the open end surface 32h of the stator 32 are brought into contact with each other, and the protrusion 32k of the stator 32 is brought into contact with the insertion hole 37e of the holder 37. By inserting the holder 37, the holder 37 and the stator 32 can be positioned in the circumferential direction so that the groove portion 37d of the holder 37 is arranged on the radial upper side. At this time, since the groove portion 37d of the holder 37 is opened radially upward with the opening end surface 32h of the stator 32, the space S2 in the stator 32 passes through the groove portion 37d of the holder 37 of the solenoid case 30. It communicates with the respiratory pathway 33 formed inside. The holder 37 and the stator 32 may be positioned in the circumferential direction by inserting the protrusion 32k of the stator 32 into the groove 37d of the holder 37 without providing the insertion hole 37e of the holder 37.

Next, the operation of the solenoid valve 1 will be described. In the off state of the solenoid valve 1 shown in FIG. 1, a magnetic circuit is formed by the solenoid case 30, the stator 32, and the plunger 4 by energizing the coil 34, and a magnetic force is applied between the annular surface portion 32g of the stator 32 and the plunger 4. By generating it, as shown in FIG. 4, the plunger 4 can be moved to the right in the axial direction toward the annular surface portion 32g side of the stator 32. At this time, by using the driving force of the plunger 4 to integrally move the rod 5 to the right in the axial direction, the tip on the right side in the axial direction of the rod 5 pushes the end surface 22a on the left side in the axial direction of the spool 22 and the spool. By moving 22 to the right in the axial direction against the urging force of a spring (not shown), the amount of control fluid flowing from the input port (not shown) to the output port of the sleeve 21 can be changed.

Further, when the energization to the coil 34 is cut off and the magnetic force generated between the annular surface portion 32g of the stator 32 and the plunger 4 is relatively weakened, as shown in FIG. 1, the urging force of a spring (not shown) is applied. As a result, the spool 22 moves to the left in the axial direction, the end surface 22a on the left side in the axial direction of the spool 22 comes into contact with the recess 32j of the stator 32, and the movement of the spool 22 is restricted, and the plunger 4 and the rod 5 move to the left in the axial direction (holder 37). (Side) to the predetermined position shown in FIG.

According to this, the plunger 4 is placed in the first accommodating portion 32e (space S2) of the stator 32 by switching between the off state of the solenoid valve 1 shown in FIG. 1 and the on state of the solenoid valve 1 shown in FIG. It can be moved in the axial direction within. At this time, the hydraulic oil L filling the inside of the first accommodating portion 32e of the stator 32 passes through the through hole 4a provided in the plunger 4 to the space on the left side (holder 37 side) of the plunger 4 in the axial direction and the axial direction of the plunger 4. It is moving to and from the space on the right side (the annular surface portion 32 g side).

Further, in order to accurately and quickly move the plunger 4 by switching the solenoid valve 1 on and off, the hydraulic oil L in the first accommodating portion 32e of the stator 32 is used in the breathing hole 21c of the sleeve 21 and the solenoid case 30. By breathing from the outside through the opening 30d, the hydraulic oil L in the moving direction of the plunger 4 can be discharged and the resistance due to the hydraulic oil L can be suppressed. Further, by providing the holder 37 at the tip of the first accommodating portion 32e of the stator 32 opposite to the spool 22 of the plunger 4, that is, at the open end surface 32h of the stator 32, the inside of the valve housing shown in FIGS. 5 and 6 is provided. When the oil level of the hydraulic oil L is lowered (for example, when the oil level is L2 or when the oil level of the hydraulic oil L is temporarily tilted), the space S2 (particularly, the first accommodating portion 32e) in the stator 32 is provided by the holder 37. ), Since the hydraulic oil L can be dammed, it is possible to suppress a decrease in the oil level in the space S2 in the stator 32, prevent deterioration of the operability of the plunger 4, and stably perform hydraulic control. A small amount of hydraulic oil flows out from the space S2 in the stator 32 to the space S1 in the sleeve 21 through the clearance between the inner peripheral surface of the second accommodating portion 32f of the stator 32 and the outer peripheral surface of the rod 5. be.

Further, the stator 32 extends in the axial direction to substantially the bottom of the solenoid case 30 so as to accommodate the plunger 4, and in the space S2 inside the stator 32, the right side (annular surface portion) of the plunger 4 in the first accommodating portion 32e in the axial direction. Since the space on the 32 g side) is substantially closed by the annular surface portion 32 g of the stator 32 and the rod 5 arranged in the second accommodating portion 32f, the space on the axial right side of the plunger 4 in the first accommodating portion 32e of the stator 32 The hydraulic oil L is blocked, and the decrease in the oil level of the hydraulic oil L in the space S2 in the stator 32 can be further suppressed.

On the other hand, when the oil level of the hydraulic oil L in the valve housing is lowered (for example, in the case of the oil level L2) in the solenoid valve 1 in which the holder 37 is not provided on the open end surface 32h of the stator 32 as in the prior art. The hydraulic oil L in the space S2 in the stator 32 flows out from the opening end surface 32h of the stator 32 through the breathing path 33 in the solenoid case 30 to the outside from the opening 30d, and the oil in the hydraulic oil L in the space S2 in the stator 32. Due to the lowered surface, the operability of the plunger 4 deteriorated and the hydraulic control became unstable.

Further, the holder 37 provided on the open end surface 32h of the stator 32 is provided with a groove portion 37d extending in the radial direction on the upward side in the radial direction, so that when the oil level of the hydraulic oil L in the valve housing drops, for example, the sleeve 21 breathes. Even when the hydraulic oil L mixed with air is sucked into the space S2 in the stator 32 through the hole 21c, the spool 22 of the plunger 4 is discharged to the outside of the stator 32 through the groove 37d of the holder 37. Since it is possible to prevent the air that has spilled to the opposite side (holder 37 side) from staying in the space S2 in the stator 32, it is possible to stabilize the drive of the plunger 4. Further, since the groove portion 37d of the holder 37 is formed so as to open upward in the radial direction with respect to the space S2 in the stator 32, the hydraulic oil L is formed from the groove portion 37d of the holder 37 when the oil level of the hydraulic oil L drops. The space S2 in the stator 32 is blocked in the axial direction by the holder 37, so that the space S2 in the stator 32 can be easily filled with the hydraulic oil L. Since the groove portion 37d of the holder 37 extends linearly upward in the radial direction, the air mixed in the space S2 in the stator 32 does not stay in the middle of the groove portion 37d, and the air is outside the stator 32. Can be discharged smoothly.

Further, by inserting the protrusion 32k of the stator 32 into the insertion hole 37e of the holder 37, the holder 37 and the stator 32 are positioned in the circumferential direction so that the groove 37d of the holder 37 is arranged on the radial upper side. Therefore, the groove portion 37d of the holder 37 can be arranged radially upward to reliably dam the hydraulic oil L in the space S2 in the stator 32.

Further, since the holder 37 is detachably attached to the open end surface 32h of the stator 32, the maintainability inside the stator 32 can be improved.

Further, since the holder 37 is provided with a small-diameter protruding portion 37c that protrudes to the right in the axial direction from the convex portion 37b, when the solenoid valve 1 is moved to the opposite side to the spool 22 of the plunger 4 in the off state. (See FIGS. 4 and 6) Since the holder 37 and the end face on the left side of the plunger 4 in the axial direction can be separated in the axial direction, the inside of the stator 32 is moved to the side opposite to the spool 22 of the plunger 4. It is possible to easily leave the hydraulic oil L in the space S2 of.

Further, since the plunger 4 is provided with a through hole 4a penetrating in the axial direction above the center in the radial direction, the space S2 in the stator 32 when the oil level of the hydraulic oil L in the valve housing drops. Since the amount of fluid flowing through the through hole 4a of the plunger 4 can be suppressed, it is possible to suppress a decrease in the oil level of the hydraulic oil L in the space S2 in the stator 32.

Next, the solenoid valve according to the second embodiment will be described with reference to FIGS. 7 and 8. The same components as those shown in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

The solenoid valve 101 according to the second embodiment will be described. As shown in FIG. 7, in the solenoid valve 101 of the present embodiment, the stator 132 is formed in a cylindrical shape with a flange, and is located vertically below the inner peripheral portion of the left end of the cylindrical portion 132a in the axial direction. A bottomed insertion groove 132k (positioning means) that is recessed from the inner diameter side to the outer diameter side and opens to the left in the axial direction is provided, and a holder 137 (dam) is attached.

As shown in FIGS. 7 and 8, the holder 137 is formed in a disk shape having substantially the same diameter as the outer diameter of the cylindrical portion 132a of the stator 132, and the end surface 137a on the right side in the axial direction has an axial direction on the inner diameter side. A columnar convex portion 137b projecting to the right is provided. The convex portion 137b is formed to have an outer diameter substantially the same as the inner diameter of the through hole 132d (first accommodating portion 132e) of the stator 132, and the convex portion 137b can be inserted into the through hole 132d of the stator 132. Further, an annular groove 137f shallow in the radial direction is provided on the left side in the axial direction (end surface 137a side) of the outer peripheral portion of the convex portion 137b. Further, at the center of the convex portion 137b in the radial direction, a columnar protruding portion 137c having a diameter smaller than that of the convex portion 137b and projecting to the right in the axial direction is provided.

Further, the holder 137 is provided with a substantially L-shaped groove portion 137d (fluid passage) extending in the radial direction from the radial upper side of the convex portion 137b to the outer peripheral portion of the end surface 137a, and the convex portion 37b is provided in the radial lower direction. A projecting portion 137e (positioning means) having a substantially rectangular cross section is provided so as to project downward in the vertical direction from the outer peripheral portion on the side. The protruding portion 137e is formed in an outer shape having substantially the same dimensions as the circumferential dimension of the concave insertion groove 132k of the stator 132 described above. According to this, when the holder 137 is attached to the open end surface 132h of the stator 132, the end surface 137a of the holder 137 and the open end surface 132h of the stator 132 are brought into contact with each other, and the protrusion 137e of the holder 137 is brought into contact with the insertion groove 132k of the stator 132. The holder 137 and the stator 132 can be positioned in the circumferential direction so that the groove portion 137d of the holder 137 is arranged on the radial upper side by inserting the holder 137 from the opening on the left side in the axial direction. Since the holder 137 and the stator 132 can be positioned in the circumferential direction by guiding them to the two side surfaces of the protrusion 137e in the circumferential direction, the holder 137 can be easily attached and the attachment accuracy is good.

Further, a gap is formed between the protruding portion 137e of the holder 137 and the insertion groove 132k of the stator 132, and the gap communicates with the space S2 in the stator 132 and is a convex portion. It communicates with the groove portion 137d via the annular groove 137f provided on the left side in the axial direction (end surface 137a side) of the outer peripheral portion of the 137b. According to this, the hydraulic oil L can be circulated from the inside of the insertion groove 132k of the stator 132 to the groove portion 137d on the radial upper side via the annular groove 137f, so that the hydraulic oil L can be moved to the side opposite to the spool 22 of the plunger 4. Sometimes it is possible to easily leave the hydraulic oil L in the space S2 in the stator 132.

Although examples of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these examples, and any changes or additions that do not deviate from the gist of the present invention are included in the present invention. Will be.

For example, in the above embodiment, the solenoid valves 1, 101 are separate holders 37 having grooves 37d, 137d on the radial upper side as a weir for blocking the hydraulic oil L at the open end faces 32h, 132h of the stators 32, 132. , 137 has been described as an embodiment, but the present invention is not limited to this, and the weir is any one that can block the hydraulic oil in the space inside the stator and allow the hydraulic oil to flow from the radial upper side to the outside of the stator. For example, it may be integrally configured with respect to the stator.

Further, in the above embodiment, the holders 37 and 137 are provided with the groove portions 37d and 137d, but the groove portions may be provided on the open end surfaces 32h and 132h of the stators 32 and 132.

Further, in the above embodiment, the embodiment in which the stators 32 and 132 are provided as the tubular body for accommodating the plunger 4, but the tubular body may be formed by the inner peripheral space of the solenoid molded body.

Further, in the above embodiment, as a spacer for axially separating the holders 37, 137 and the end face on the left side in the axial direction of the plunger 4, the protrusions 37b, 137b of the holders 37, 137 project to the right in the axial direction. Although the one provided with the small-diameter protrusions 37c and 137c has been described, the spacer may be provided separately from the holder.

1,101 Solenoid valve 2 Valve part 3 Solenoid part 4 Plunger (movable iron core)
4a Through hole 5 Rod 21 Sleeve 21a Through hole 21b Opening 21c Breathing hole (opening)
22 Spool 30 Solenoid case 30a Cylindrical part 30b First storage cylinder part 30c Second storage cylinder part 30d Opening (opening)
31 Solenoid molded body 32,132 Stator (cylinder body)
32a, 132a Cylindrical part 32b Circular recess 32c Flange part 32d, 132d Through hole 32e, 132e First accommodating part 32f Second accommodating part 32g Circular surface part 32h, 132h Opening end surface 32j Recessed part 32k Protrusion part (positioning means)
33 Respiratory path 34 Coil 37,137 Holder (weir)
37a, 137a End faces 37b, 137b Convex 37c, 137c Protruding 37d, 137d Groove (fluid passage)
37e Insertion hole (positioning means)
132k insertion groove (positioning means)
137e Protruding part (positioning means)
137f Circular groove L Hydraulic oil L1, L2 Oil level S1, S2 Space

Claims (6)

With spool
A sleeve in which the spool is arranged so as to be movable in the axial direction,
A movable iron core arranged on one end side of the spool and moving the spool,
A solenoid molded body arranged on the outer circumference of the movable iron core and
A solenoid case for accommodating the movable iron core and the solenoid molded body,
A cylinder for accommodating the movable iron core is provided in the inner space.
An immersion type solenoid valve that can be mounted horizontally on the member to be mounted.
A breathing path is formed between the solenoid molded body and the solenoid case to communicate the space of the movable iron core in the cylinder opposite to the spool and the outside of the solenoid case.
The cylinder is provided with a weir at the tip of the movable iron core on the opposite side of the spool.
A solenoid valve characterized in that a fluid passage communicating with the outside of the cylinder is provided above the weir . The solenoid valve according to claim 1, wherein a spacer for axially separating the weir and the movable iron core is provided between the weir and the movable iron core. The solenoid valve according to claim 1 or 2, wherein the weir is a holder that is detachably attached to the opening of the cylinder. The solenoid valve according to any one of claims 1 to 3 , wherein the movable iron core is provided with a through hole that penetrates in the axial direction on the upper side of the center in the radial direction. The solenoid valve according to claim 3 or 4 , further comprising a positioning means for positioning the holder and the cylinder in the circumferential direction. The sleeve is attached to the cylinder, and a rod is arranged inside the cylinder between the movable iron core and one end side of the spool.
The solenoid valve according to any one of claims 1 to 5 , wherein the rod is movable inside the cylinder.

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