JP7171509B2 - solenoid valve - Google Patents

Description

The present invention relates to a solenoid valve used, for example, for hydraulic control of a hydraulic circuit.

As a conventional solenoid valve for hydraulic control, a spool valve portion having a cylindrical spool housed in a sleeve, and a solenoid molded body in which a stator, a plunger, and a coil for axially driving the spool are covered with resin are housed. and a solenoid unit having a solenoid case, which is arranged between the pressure source and the supply destination of the pump or accumulator, and drives the spool so that the fluid whose pressure and flow rate are adjusted can be supplied to the supply destination. It's becoming

For example, in the solenoid valve disclosed in Patent Document 1, a plunger is arranged inside the solenoid portion, and a bearing as a bush is arranged between the inner peripheral surface of the solenoid portion and the outer peripheral surface of the plunger. and the bearing supports the plunger for axial movement. The axial movement of the plunger is stabilized by sliding the plunger inside such a bearing. In such a bearing, fluid such as hydraulic oil existing in the solenoid part enters the gap between the inner peripheral surface of the bearing and the outer peripheral surface of the plunger, thereby lubricating the plunger and the bearing. sexuality is improving.

JP 2017-163049 A (page 6, FIG. 1)

However, in the solenoid valve of Patent Document 1, the inner peripheral surface of the bearing slides against the outer peripheral surface of the plunger. It is difficult for fluid to enter the gap between the inner peripheral surface of the bearing and the outer peripheral surface of the plunger, and repeated movement of the plunger may result in poor lubrication in the gap between the inner peripheral surface of the bearing and the outer peripheral surface of the plunger, preventing smooth movement of the plunger. was there.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a solenoid valve in which the plunger can move stably and smoothly in the axial direction.

In order to solve the above problems, the solenoid valve of the present invention is
a solenoid portion including a stator; a plunger arranged inside the solenoid portion and brought into contact with and separated from the stator by an electromagnetic force; a bush arranged between an inner peripheral surface of the solenoid portion and an outer peripheral surface of the plunger; A solenoid valve comprising a valve body that reciprocates by the operation of the plunger to open and close the valve,
Spaces are formed on both sides in the moving direction of the plunger,
At least one end of the bush has an inner slanted surface on the inner diameter side that is formed so as to increase in diameter toward one space,
The outer peripheral surface of the plunger is arranged to face the inner inclined surface.
According to this, the axial movement of the plunger is stabilized by the bush disposed between the inner peripheral surface of the solenoid portion and the outer peripheral surface of the plunger, and the axial movement of the plunger is stabilized between the outer peripheral surface of the plunger and the inner inclined surface of the bush. Since the fluid in one space can be retained, the fluid can be easily drawn between the outer peripheral surface of the plunger and the inner peripheral surface of the bush when the plunger moves, and the plunger can move smoothly.

The inner inclined surface may be formed over the entire circumference.
According to this, since the fluid can be held in a wide range over the entire circumference between the plunger and the bush, it is easy to draw the fluid between the outer peripheral surface of the plunger and the inner peripheral surface of the bush when the plunger moves.

The inner inclined surfaces may be formed at both ends of the bush.
According to this, the fluid can be drawn between the outer peripheral surface of the plunger and the inner peripheral surface of the bush from one space or the other space regardless of the movement direction of the plunger.

The plunger may be axially longer than the bush.
According to this, the outer peripheral surface of the plunger can always face one of the inner inclined surfaces of the bush.

An outer diameter side of at least one end of the bush may have an outer inclined surface formed so as to decrease in diameter toward the one space.
According to this, it is easy to attach the bush to the solenoid portion.

The outer inclined surface may be formed on both axial ends of the bush.
According to this, the bush can be easily attached to the solenoid portion from any direction.

Both axial ends of the bush may extend radially and may be flat.
According to this, it is possible to prevent the end portion of the bush and the inner peripheral surface of the solenoid portion from being damaged when the bush is attached to the solenoid portion.

It is a perspective view of a solenoid valve in the example of the present invention. It is a sectional side view of a solenoid valve. For convenience of explanation, the spool is illustrated in a side view. It is a perspective view of a 3rd cylindrical body (bush). FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3; (a) to (c) are explanatory diagrams showing how the plunger moves toward the other end in the axial direction. 4(a) to 4(c) are explanatory diagrams showing the procedure for assembling the solenoid valve; FIG. FIG. 10 is an explanatory diagram showing a third cylindrical body (bush) in Modification 1 of the present invention; It is an explanatory view showing the 3rd cylindrical object (bush) in modification 2 of the present invention. FIG. 11 is an explanatory diagram showing a third cylindrical body (bush) in modification 3 of the present invention; FIG. 11 is an explanatory diagram showing a third cylindrical body (bush) in modification 4 of the present invention;

A mode for implementing a solenoid valve according to the present invention will be described below based on an embodiment.

A solenoid valve according to an embodiment will be described with reference to FIGS. 1 to 5. FIG. In the following description, the left side of the paper surface of FIG. 2 is defined as one axial end side of the solenoid valve, and the right side of the paper surface of FIG. 2 is defined as the other axial direction end side of the solenoid valve.

As shown in FIG. 1, the solenoid valve 1 of this embodiment is a spool type solenoid valve, and is used in a hydraulically controlled device such as an automatic transmission of a vehicle. The solenoid valve 1 is used as a so-called oil-immersed solenoid valve that is mounted horizontally in a mounting hole of a valve housing on the device side and immersed in hydraulic oil, which is a liquid in the valve housing.

As shown in FIGS. 1 and 2, a solenoid valve 1 is constructed by integrally attaching a valve portion 2 to a solenoid portion 3 for adjusting the flow rate of a control fluid such as hydraulic oil. 2 shows the OFF state of the solenoid valve 1 in which the coil 34 of the solenoid molded body 31 is not energized.

First, the structure of the valve portion 2 will be described. As shown in FIGS. 1 and 2, the valve section 2 includes an input port 24, an output port 25, an exhaust port 26, a drain port 27, and a feedback port 28, which are connected to flow paths provided in mounting holes of the valve housing. a sleeve 21 provided with openings for various ports such as; a spool 22 as a valve element liquid-tightly housed in a through hole 21a formed axially on the inner diameter side of the sleeve 21; It is composed of a coil-shaped spring 29 that biases the end side and a retainer 23 that holds the spring 29 .

The sleeve 21 is formed with a drain port 27, a feedback port 28, an input port 24, an output port 25, and a discharge port 26 in this order from one axial end to the other axial end. The spool 22 can be reciprocated in the axial direction, and by reciprocating the spool 22 in the axial direction, the communication state of various ports is changed to control the pressure and flow rate of hydraulic oil. . The sleeve 21, spool 22, and retainer 23 are made of materials such as aluminum, iron, stainless steel, and resin.

Next, the structure of the solenoid portion 3 will be described. As shown in FIG. 2, the solenoid portion 3 includes a solenoid case 30 made of a magnetic metal material such as iron, a solenoid molded body 31 housed in the solenoid case 30, and a It is mainly composed of a stator 32 arranged and a plunger 4 arranged on one side in the axial direction of the stator 32 so as to be axially movable.

The solenoid molded body 31 is formed by molding a coil 34 with a resin 35, and a control current is supplied to the coil from a connector of a connector portion 35a extending to the outside from an opening 30j provided on the outer diameter side of the solenoid case 30. 34. This solenoid molded body 31 is integrally formed on the outer diameter side of the stator 32 . The solenoid case 30 has an opening at one end in the axial direction, and the opening is closed by crimping the lid member 10 .

The stator 32 is a tubular body having a through-hole 32a extending axially through its central portion, and is made of a magnetic metal material such as iron. The stator 32 has a recess 32b formed at one end in the axial direction and recessed toward the other end in the axial direction, and the recess 32b communicates with the through hole 32a. A ring-shaped damper member 6 made of a non-magnetic material such as resin or rubber is fixed to the bottom of the recess 32b. One end of the spool 22 is in contact with the other end of the stator 32, and the movement of the spool 22 toward the one end in the axial direction is restricted.

A first cylindrical body 7 made of a non-magnetic material is disposed on one end side of the stator 32 in the axial direction, and a second cylindrical body 7 made of a magnetic material is disposed on one end side of the first cylindrical body 7 in the axial direction. A cylindrical body 8 is arranged, and inside the first cylindrical body 7 and the second cylindrical body 8, a third cylindrical body 9 as a bush made of a non-magnetic material is provided. 7 and the second tubular body 8 . Specifically, the third tubular body 9 is fitted inside the first tubular body 7 and the second tubular body 8 . The solenoid valve 1 of this embodiment is a so-called split type solenoid valve in which the stator 32 and the second cylindrical body 8, which are split in the axial direction, form a magnetic circuit.

The plunger 4 is formed in a cylindrical shape from a magnetic metal material such as iron, and is disposed on the inner peripheral surface 9d of the third tubular body 9 so as to be able to slide thereon. The outer peripheral surface 4c of the plunger 4 and the inner peripheral surface 9d of the third cylindrical body 9 are slightly spaced apart (see FIG. 5).

A space S1 as one space is formed on one side of the plunger 4 in the axial direction, and a space S2 as the other space is formed on the other side of the plunger 4 in the axial direction. The plunger 4 is formed with a through hole 4a penetrating in parallel with the central axis at an eccentric position to communicate the space S1 and the space S2. Specifically, the space S1 is defined by the plunger 4, the second cylindrical body 8, and the lid member 10, and the space S2 is defined by the plunger 4, the through hole 32a of the stator 32, the recess 32b, and the spool 22. ing. The space S3 inside the sleeve 21 functions as a third space different from the spaces S1 and S2 defined by the spool 22 from the spaces S1 and S2.

One end of a rod 5 that is slidably inserted into a through hole 32a of a stator 32 is in contact with the end surface 4b of the plunger 4 on the other end side. It abuts on one side end. One end of the rod 5 may not be in contact with the end surface 4b of the plunger 4 on the other end side, or may be fixed.

Next, the third cylindrical body 9 will be explained. As shown in FIGS. 3 and 4, the third cylindrical body 9 is a so-called winding bush made of a non-magnetic material having low frictional properties such as PTFE, and having a substantially C shape when viewed from the axial direction. be. The axial length L1 of the third cylindrical body 9 is shorter than the axial length L2 of the plunger 4 (L1<L2 (see FIG. 4 in particular)). , the third tubular body 9 is radially superimposed on the plunger 4 .

A plurality of fine grooves (not shown) are formed on the inner peripheral surface of the third cylindrical body 9, and the grooves can hold the fluid, thereby increasing the slidability with respect to the plunger 4. As shown in FIG. The shape of the groove of the third tubular body 9 may be freely designed such as a dimple having a concave cross-sectional view or a long groove having a rectangular cross-sectional view. does not necessarily have to be grooved. Also, the third cylindrical body 9 may be made of a magnetic material such as iron.

At one end of the third cylindrical body 9, an inner tapered surface 9a as an inner inclined surface formed on the inner diameter side and expanding in diameter toward one side, and an inner tapered surface 9a formed on the outer diameter side and directed to the one side It has an outer tapered surface 9b as an outer inclined surface whose diameter decreases gradually, and an end surface 9c connecting one ends of the inner tapered surface 9a and the outer tapered surface 9b. The end surface 9c is formed into a flat surface extending perpendicularly to the axial direction.

The inner tapered surface 9a has an angle θ1 of about 150 degrees between the inner tapered surface 9a and the inner peripheral surface 9d of the third cylindrical body 9, and an angle θ2 between the inner tapered surface 9a and the end surface 9c. It is approximately 1200 degrees. That is, the angle θ2 on the inner diameter side at one end of the third cylindrical body 9 is formed to be an obtuse angle.

The radial dimension L3 of the inner tapered surface 9a (the radial dimension from the inner peripheral surface 9d of the third cylindrical body 9 to the inner diameter side end of the end face 9c) is equal to the inner peripheral surface 9d of the third cylindrical body 9. and the outer peripheral surface 4c of the plunger 4 (L3>L4). In addition, the radial dimension L3 of the inner tapered surface 9a is 1/5 or more of the plate thickness of the plate-shaped body that constitutes the third tubular body 9, preferably the plate-shaped body that constitutes the third tubular body 9. It is sufficient that it is formed in a size of 1/3 or more of the plate thickness of . The angle θ1 formed by the inner tapered surface 9a and the inner peripheral surface of the third cylindrical body 9 should be larger than 90 degrees and smaller than 180 degrees, preferably 130 degrees to 160 degrees.

The outer tapered surface 9b has an angle θ3 of approximately 160 degrees between the outer tapered surface 9b and the outer peripheral surface of the third cylindrical body 9, and an angle θ4 between the outer tapered surface 9b and the end surface 9c is approximately 160 degrees. It is 110 degrees. That is, the outer diameter side angle θ4 at one end portion of the third cylindrical body 9 is formed to be an obtuse angle. In addition, the outer tapered surface 9b may be formed in a shape symmetrical with respect to the line extending in the axial direction with respect to the inner tapered surface 9a. Also, it is preferable that the angle θ1 formed between the inner tapered surface 9a and the inner peripheral surface 9d of the third cylindrical body 9 is smaller than the angle θ3 formed between the outer tapered surface 9b and the outer peripheral surface of the third cylindrical body 9. (.theta.1<.theta.3), in this case, a large liquid pool portion 11, which will be described later, can be formed to hold a large amount of fluid in the space S1.

Further, at the other end of the third cylindrical body 9, an inner tapered surface 9a' as an inner inclined surface formed on the inner diameter side and expanding in diameter toward the other side, and an inner tapered surface 9a' formed on the outer diameter side and on the other side It is provided with an outer tapered surface 9b' as an outer inclined surface whose diameter decreases toward and an end surface 9c' connecting one ends of the inner tapered surface 9a' and the outer tapered surface 9b'. The end surface 9c' is formed as a flat surface extending in a direction orthogonal to the axial direction. The inner tapered surface 9a', the outer tapered surface 9b', and the end surface 9c' are formed line-symmetrically with the inner tapered surface 9a, the outer tapered surface 9b, and the end surface 9c with respect to the line extending in the radial direction of the third cylindrical body 9. ing.

Next, the operation of the solenoid valve 1 will be explained schematically. When the solenoid valve 1 shown in FIG. 2 is in the OFF state, a magnetic circuit is formed by the solenoid case 30, the second cylindrical body 8, the plunger 4, and the stator 32 by energizing the coil 34. , the plunger 4 and the rod 5 can be axially moved toward the stator 32 side. At this time, the fluid in the space S2 moves to the space S1 through the through hole 4a of the plunger 4. As shown in FIG. As a result, the tip of the rod 5 on the other side in the axial direction pushes the end surface of the spool 22 on the one side in the axial direction, moving the spool 22 to the one side in the axial direction against the urging force of the spring 29, and opening the input port of the sleeve 21. The amount of control fluid flowing from 24 to output port 25 can be varied.

When the coil 34 is deenergized and the magnetic force generated between the stator 32 and the plunger 4 is relatively weakened, the biasing force of the spring 29 causes the spool 22 to move to one side in the axial direction. As a result, the plunger 4 and the rod 5 move to one side in the axial direction. At this time, the fluid in the space S1 moves to the space S2 through the through hole 4a of the plunger 4. As shown in FIG. Further, the end surface of the spool 22 on one side in the axial direction abuts the end surface of the stator 32 on the other side, and movement of the spool 22 is restricted.

Next, the motion of the fluid when the plunger 4 moves will be described. Here, only the movement of the fluid on one axial end side of the plunger 4 and the third cylindrical body 9 will be explained, and the explanation of the movement of the fluid on the other axial end side of the plunger 4 and the third cylindrical body 9 will be omitted. do.

As shown in FIG. 5A, when the solenoid valve 1 is in the OFF state, the outer peripheral surface 4c of the plunger 4 faces the inner tapered surface 9a of the third cylindrical body 9. As shown in FIG. In other words, the inner tapered surface 9a and the outer peripheral surface 4c of the plunger 4 overlap when viewed in the radial direction. A space having a substantially triangular cross section between the inner tapered surface 9a and the outer peripheral surface 4c of the plunger 4 functions as a liquid reservoir 11 in which the fluid in the space S1 is retained.

As shown in FIG. 5B, when the plunger 4 moves from the state shown in FIG. 4 and the inner peripheral surface 9 d of the third cylindrical body 9 . As shown in FIG. 5C, the plunger 4 moves further toward the other axial end from the state shown in FIG. Movement to the side is restricted (see FIG. 2).

In this manner, the fluid in the space S1 can be retained in the liquid reservoir 11 formed between the outer peripheral surface 4c of the plunger 4 and the inner tapered surface 9a of the third tubular body 9, so that the fluid can be retained when the plunger 4 moves. It is easy to draw between the outer peripheral surface 4c of the plunger 4 and the inner peripheral surface 9d of the third cylindrical body 9, and the movement of the plunger 4 can be made smooth. Specifically, as shown particularly in FIG. 5(b), when the plunger 4 moves to one side in the axial direction, the fluid flows along the inner tapered surface 9a and the outer peripheral surface 4c of the plunger 4 and the third tubular shape. Since the fluid is guided to move between the inner peripheral surface 9d of the body 9, the fluid is drawn between the outer peripheral surface 4c of the plunger 4 and the inner peripheral surface 9d of the third cylindrical body 9, Poor lubrication between the outer peripheral surface 4c and the inner peripheral surface 9d of the third cylindrical body 9 is suppressed.

That is, the plunger 4 slides while being guided by the third tubular body 9 arranged between the inner peripheral surfaces of the first tubular body 7 and the second tubular body 8 and the outer peripheral surface 4c of the plunger 4. , the movement of the plunger 4 in the axial direction is stabilized, and the fluid is allowed to flow sufficiently between the outer peripheral surface 4c of the plunger 4 and the inner peripheral surface 9d of the third cylindrical body 9, thereby smoothing the movement of the plunger 4. be able to.

In addition, since the inner tapered surface 9 a is formed along the entire circumference of the end of the third tubular body 9 , the liquid reservoir portion 11 extends over the entire circumference between the plunger 4 and the third tubular body 9 . Since the fluid can be held in a wide range, the fluid can be easily drawn between the outer peripheral surface 4c of the plunger 4 and the inner peripheral surface 9d of the third tubular body 9 when the plunger 4 is moved.

Further, inner tapered surfaces 9a and 9a' are formed at both axial ends of the third cylindrical body 9. As shown in FIG. That is, since the liquid pools 11 are formed at both ends of the plunger 4 and the third cylindrical body 9 in the axial direction, regardless of the moving direction of the plunger 4, the fluid in the space S1 or the space S2 can flow with the outer peripheral surface 4c of the plunger 4. It can be drawn between the inner peripheral surface 9 d of the third cylindrical body 9 .

Further, the axial length L2 of the plunger 4 is longer than the axial length L1 of the third cylindrical body 9, and when the solenoid valve 1 is in the OFF state, the outer peripheral surface 4c of the plunger 4 is are opposed to the inner tapered surfaces 9a, 9a' and liquid reservoir portions 11 are formed at both ends in the axial direction. A liquid pool portion 11 is formed on the other end side in the axial direction. According to this, regardless of whether the solenoid valve 1 is in the off state or the on state, the liquid reservoir 11 is formed on the side opposite to the moving direction of the plunger 4, so that the fluid is reliably supplied to the outer peripheral surface 4c of the plunger 4 and the third cylinder. It can be pulled in between the inner peripheral surface 9 d of the shaped body 9 .

Next, a procedure for assembling the solenoid valve 1 will be described. As shown in FIG. 6(a), first, the sleeve 21 and the spool 22 are attached to the other end of the solenoid case 30 in the axial direction, and the solenoid molded body 31 and the stator 32 are inserted through the opening at the one end of the solenoid case 30 in the axial direction. do. Also, the rod 5 is inserted into the through hole 32 a of the stator 32 . Then, the first cylindrical body 7 and the second cylindrical body 8 are inserted into the solenoid molded body 31 through the opening at one axial end of the solenoid case 30 . The first tubular body 7 contacts the other axial end of the stator 32 , and the second tubular body 8 contacts the other axial end of the first tubular body 7 . It should be noted that the solenoid molded body 31 and the stator 32 may be attached to the solenoid case 30 with the first tubular body 7 and the second tubular body 8 inserted therein.

Next, as shown in FIG. 6(b), the third tubular body 9 is inserted inside the first tubular body 7 and the second tubular body 8 from one end side in the axial direction. At this time, as described above, the outer tapered surface 9b′ is formed on the other end side of the third tubular body 9, so that the corner portion on the outer diameter side of the third tubular body 9 is the first tubular body. It is smoothly inserted without interfering with the inner peripheral surfaces of the shaped body 7 and the second tubular body 8, and the third tubular body 9 can be attached easily. Specifically, when the corners on the outer diameter side form a substantially right angle like a conventional bushing, when inserting the bushing inside the first tubular body 7 and the second tubular body 8, There is a risk that the inner peripheral surfaces of the first cylindrical body 7 and the second cylindrical body 8 may be bitten at the corners on the outer diameter side, and the bushing may not be inserted to a predetermined position or may not be inserted straight. Since the third tubular body 9 of the embodiment is smoothly inserted into the inner side of the first tubular body 7 and the second tubular body 8 by the outer tapered surface 9b', the third tubular body 9 is held at a predetermined position. can be inserted straight up to

Further, since the outer tapered surfaces 9b, 9b' are formed on both axial ends of the third tubular body 9, regardless of the orientation of the third tubular body 9, the first tubular body 7 and the second tubular body Easy to insert into the body 8.

Further, when the third tubular body 9 is inserted into the first tubular body 7 and the second tubular body 8, the end face 9c' of the third tubular body 9 is the first tubular body. It comes into surface contact with an annular collar portion 7a protruding from 7 toward the inner diameter side. As described above, the end surface 9c' of the third tubular body 9 is in surface contact with the flange portion 7a, so that the third tubular body 9 is inserted into and attached to the first tubular body 7 and the second tubular body 8. state stabilizes. Further, when the third tubular body 9 is inserted into the first tubular body 7 and the second tubular body 8, the diameter of the third tubular body 9 is reduced and the radial gap ( 3) is almost eliminated.

Furthermore, compared to the case where the other end in the axial direction of the third tubular body 9 does not have an end face 9c′ and has an acute angle tapering off, the third tubular body 9 is arranged in the first tubular body 7 and the second tubular body. Since it is possible to prevent the other axial end of the third tubular body 9 from biting into the inner peripheral surfaces of the first tubular body 7 and the second tubular body 8 when it is inserted into the body 8, the third tubular body It is possible to suppress damage to the other axial end of the cylindrical body 9 and the inner peripheral surfaces of the first cylindrical body 7 and the second cylindrical body 8, and to prevent the third cylindrical body 9 from being damaged by the first cylindrical body 7 and the second cylindrical body 8. 2 It is easy to insert into the tubular body 8 .

Subsequently, as shown in FIG. 6(c), the plunger 4 is inserted into the third cylindrical body 9 from one end in the axial direction. At this time, the outer diameter side edge of the end face 4b on the other end side of the plunger 4 is guided along the inner tapered surface 9a of the third cylindrical body 9, so that the plunger 4 is moved inside the third cylindrical body 9. It can be inserted easily. In addition, since the inner tapered surfaces 9a and 9a' are formed on both axial ends of the third cylindrical body 9, the mounting direction of the third cylindrical body 9 with respect to the first cylindrical body 7 and the second cylindrical body 8 is as follows. Regardless, the plunger 4 can be easily inserted inside the third tubular body 9 .

After that, the cover member 10 is arranged on one axial side of the second tubular body 8 , and the one axial end of the solenoid case 30 is bent, so that the cover member 10 is crimped and fixed to the solenoid case 30 . As a result, the first cylindrical body 7, the second cylindrical body 8, and the stator 32 are axially held between the wall portion of the solenoid case 30 on the other axial end side and the lid member 10, thereby assembling the solenoid valve 1. is completed.

In the above-described embodiment, the inner tapered surfaces 9a and 9a' are formed on the inner diameter side edge portions of both ends in the axial direction of the third cylindrical body 9. However, as shown in FIG. Inner tapered surfaces 9a and 9a' may be formed slightly inward in the axial direction from both ends in the axial direction of the cylindrical body 9 (Modification 1 of the bushing).

Further, in this embodiment, the inner tapered surfaces 9a and 9a' are formed on both axial ends of the third cylindrical body 9, but as shown in FIG. It is sufficient if a surface is formed. Further, in the above-described embodiment, the outer tapered surfaces 9b, 9b' are formed on both axial ends of the third cylindrical body 9, but as shown in FIG. It is sufficient if a surface is formed.

In addition, as shown in FIG. 8, when the inner tapered surface and the outer tapered surface are provided on one side of the third tubular body 9 in the axial direction, the outer tapered surface is provided at the end opposite to the inner tapered surface. A face is preferably formed. According to this, the third tubular body 9 can be easily inserted into the first tubular body 7 and the second tubular body 8 from the outer tapered surface side, and the plunger 4 can be inserted from the inner tapered surface side of the third tubular body 9 . can be easily inserted inside the third cylindrical body 9 (bush modification 2).

In this embodiment, the inner tapered surfaces 9a and 9a' of the third tubular body 9 are formed along the circumferential direction. A groove having an inner inclined surface may be formed in a part of the direction (variation 3 of the bushing). The circumferential length of the grooves having the inner inclined surfaces and the number of grooves arranged in the circumferential direction can be freely changed.

In this embodiment, the plunger 4 is longer than the third cylindrical body 9 in the axial direction. The axial length of the plunger 4 may be equal to or less than the axial length of the third tubular body 9 as long as it faces the inner tapered surface of the plunger 9 .

In this embodiment, the end surfaces 9c and 9c' of the third cylindrical body 9 are flat surfaces extending perpendicularly to the axial direction. It may be formed in a curved shape or the like. Even in this case, the third tubular body 9 can be easily inserted into the first tubular body 7 and the second tubular body 8, and the third tubular body 9 or the first tubular body 7 and the second tubular body 9 can be easily inserted. It is possible to suppress breakage of the two cylindrical bodies 8 (bush modification 4).

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions within the scope of the present invention are included in the present invention. be

For example, in the above embodiment, one end of the rod 5 is in contact with the end face 4b of the plunger 4, and the other end of the rod 5 is in contact with one end of the spool 22. The rod 5 may be fixed to the plunger 4 or the spool 22 by a fixing member such as a bolt, welding or adhesion.

In the above-described embodiment, the plunger 4 moves toward one end in the axial direction when the solenoid valve 1 is turned off, and the plunger 4 moves toward the other end in the axial direction when the solenoid valve 1 is turned on. The plunger 4 may move to the other end in the axial direction when the valve 1 is off, and move to the one end in the axial direction when the solenoid valve 1 is on.

Further, in the above-described embodiment, the plunger 4 is in a non-contact state with the stator 32 by the damper member 6 when the solenoid valve 1 is on. may In the above-described embodiment, the plunger 4 is in a non-contact state with the lid member 10 when the solenoid valve 1 is off (see FIG. 2). It may be.

Further, in the above embodiments, the spool type solenoid valve using a spool as the valve element has been described, but the present invention is not limited to this, and may be a solenoid valve using a globe valve, a gate valve, or the like.

1 Solenoid Valve 2 Valve Portion 3 Solenoid Portion 4 Plunger 5 Rod 7 First Cylindrical Body 8 Second Cylindrical Body 9 Third Cylindrical Body (Bushing)
9a, 9a' inner tapered surface (inner inclined surface)
9b, 9b' outer tapered surface (outer inclined surface)
9c, 9c' end surface 9d inner peripheral surface 11 liquid reservoir 21 sleeve 22 spool (valve element)
30 solenoid case 31 solenoid molded body 32 stator S1 space (one space)
S2 space (the other space)

Claims (6)

a solenoid portion including a stator; a plunger arranged inside the solenoid portion and brought into contact with and separated from the stator by an electromagnetic force; a bush arranged between an inner peripheral surface of the solenoid portion and an outer peripheral surface of the plunger; A solenoid valve comprising a valve body that reciprocates by the operation of the plunger to open and close the valve,
Spaces are formed on both sides in the moving direction of the plunger,
At least one end of the bush has an inner slanted surface on the inner diameter side that is formed so as to increase in diameter toward one space,
The outer peripheral surface of the plunger is arranged to face the inner inclined surface ,
A solenoid valve having an outer slanted surface formed on the outer diameter side of at least one end of the bush so as to decrease in diameter toward the one space . 2. The solenoid valve according to claim 1, wherein said inner inclined surface is formed over the entire circumference. 3. The solenoid valve according to claim 1, wherein the inner inclined surfaces are formed on both ends of the bush. 4. The solenoid valve according to claim 1, wherein said plunger is axially longer than said bush. 5. The solenoid valve according to any one of claims 1 to 4 , wherein the outer inclined surfaces are formed on both ends of the bush in the axial direction. 6. The solenoid valve according to any one of claims 1 to 5 , wherein both axial ends of said bush extend radially and are flat.

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