JP2003314739A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve that suppresses loss in flow rate discharged from a discharge port. <P>SOLUTION: The solenoid valve comprises: a valve mechanism 2 having an intake port 61 for taking fluid therein and the discharge port 41 discharging the fluid therefrom; and a coil 32 device 3 in contact with the valve mechanism 2 and operating the valve mechanism 2 according to an energization state. The valve mechanism 2 includes: a hollow and cylindrical base 4 having the discharge port 41; a ball 5 housed in the base 4 to communicate the intake port 61 with the discharge port 41 or cut off between the ports according to the energization state of the coil 32 device 3; and a slip-off preventive member 6 made of a member different from that of the base 4, having the intake port 61, and preventing slip-off of the ball 5 from the base 4. The slip-off preventive member 6 has a large-diameter hole larger than an outer diameter of the ball 5, and a plurality of projecting portions projecting from the outer periphery of the large-diameter hole toward the inner diameter side of the outer diameter of the ball 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for controlling fluid pressure supply / discharge.

[0002]

2. Description of the Related Art As prior art, Japanese Patent Laid-Open No. 4-33188
There is a technique disclosed in Japanese Patent No. This publication is composed of a valve portion and a solenoid portion connected to the valve portion. The valve portion has a cylindrical valve seat in a cylindrical base, and a fluid suction is provided on a front end wall of the base. A three-way solenoid valve is disclosed in which the mouth is provided with a fluid discharge port on the peripheral wall. A ball is housed inside the base, and the front end wall of the base prevents the ball from falling out of the outside of the base.

[0003]

In the solenoid valve having the structure shown in the above-mentioned prior art, the inner diameter of the front end wall of the base is made smaller than the inner diameter of the cylindrical portion of the base in order to prevent balls from coming off. In general, the inner diameter of the front end wall (outer diameter of the suction port) is a circle smaller than the outer diameter of the ball. Therefore, there is a problem that most of the fluid introduced into the base through the suction port directly hits the ball and the flow rate loss of the fluid discharged from the discharge port becomes large.

Therefore, the present invention has been made to solve the above problems.
It is a technical object to provide an electromagnetic valve that suppresses the loss of the flow rate discharged from the discharge port as much as possible.

[0005]

Means for Solving the Problems The measures taken by the present invention to solve the above technical problems are a valve mechanism having a suction port for sucking a fluid and a discharge port for discharging a fluid, and a valve mechanism connected to the valve mechanism. And a solenoid device having a coil device for operating the valve mechanism according to an energized state, wherein the valve mechanism is a hollow cylindrical base having the discharge port, and is housed in the base and A ball that connects and disconnects between the suction port and the discharge port according to the state of energization to the coil device, and a member different from the base, have the suction port, and prevent the ball from falling off the base. A retaining member for preventing the retaining member, the retaining member protruding from the outer periphery of the large diameter hole having a diameter larger than the outer diameter of the ball toward the inner diameter side of the outer diameter of the ball. Do And an electromagnetic valve, characterized in that it comprises a number of protrusions.

According to the first aspect of the present invention, the protrusion of the retaining member reliably prevents the ball from falling out of the base. Further, since the large diameter portion is larger than the outer diameter of the ball, when the fluid is sucked from the suction port, the fluid sucked from the outer peripheral side of the suction port (outer peripheral side of the large diameter hole) faces the ball. It goes to the discharge port without doing. Therefore,
The flow rate loss of the fluid discharged from the discharge port does not increase, and the flow rate of the fluid discharged can be increased with respect to the conventional solenoid valve. Further, since the retaining member is made of a member different from the base, it is not necessary to mold the large diameter hole and the protruding portion together with the base, and it is possible to mold by a simple process such as press working, which is advantageous in manufacturing. .

Claims 2 to 4 show more specific configurations of the above-mentioned means. In the above-mentioned means, when the projecting portions of the retaining member are formed at three positions at equal intervals in the circumferential direction as described in claim 2, the balls are reliably prevented from coming off and the suction port is removed from the suction port. This is preferable because it can sufficiently inhale the fluid.
Further, as described in claim 3, the retaining member has a guide portion that extends in the axial direction between the ball and the inner peripheral surface of the base and guides the movement of the ball in the radial direction. This is preferable because the radial position of the ball is stable when the coil device is energized / de-energized. Further, as described in claim 4, when the retaining member is formed by press working, the retaining member can be molded relatively easily, which is more preferable.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments according to the present invention will be described below with reference to the drawings. In the present embodiment, a shift valve (not shown) provided in the hydraulic circuit of the automatic transmission (not shown) for switching the friction engagement element whose fluid pressure is controlled.
It will be described as a solenoid valve for switching the position of.

FIG. 1 is a solenoid valve 1 according to an embodiment of the present invention.
FIG. The solenoid valve 1 includes a valve mechanism 2 having a suction port for sucking fluid and a discharge port for discharging fluid, and a valve mechanism 2
And a coil device 3 that switches the operation of the valve mechanism 2 (switches the communication state) according to the energized state (energized / non-energized).

The valve mechanism 2 includes a hollow cylindrical base 4 having a discharge port 41, and a space between the suction port 61 and the discharge port 41 depending on the energization state of the coil device 3 while being housed in the base 4. A ball 5 that communicates / blocks, a member different from the base 4, and has a suction port 61 and a retaining member 6 that prevents the ball 5 from falling out of the base 4.
The first sheet member 43 is inserted and fixed to the inner peripheral surface of the base 4, and the second sheet member 46 is similarly inserted and fixed to the inner peripheral surface of the base 4. Further, the base 4 has a discharge port 42 for discharging a fluid between the base 4 and a yoke 35 described later.
Is formed. The suction port 61 communicates with an oil pump (not shown) and sucks the discharge pressure from the oil pump. The discharge port 41 communicates with the shift valve,
The position of the shift valve is switched according to the discharged fluid pressure. Further, the discharge port 42 is connected to an oil pan (not shown) and has an atmospheric pressure.

Each component of the valve mechanism 2 will be further described.
The base 4 is made of aluminum, is hollow so as to have different inner diameters by cutting, and the discharge port 41 is formed perpendicular to the axial direction of the base 4 so as to communicate with this hollow portion. The first seat member 43 is inserted and fixed from the left side of FIG. 1, and a ball seat portion 44 for seating the ball 5 is formed on one end side and a through hole 45 is formed in the center. The second seat member 46 is inserted and fixed from the right side of FIG. 1, a valve seat 47 for seating a drain valve of the movable core 8 described later is formed on one end side, and a through hole 48 is also formed in the center. Has been done.

Next, the retaining member 6 which is the gist of the present invention.
Will be described. An enlarged cross-sectional view of the retaining member 6 is shown in FIG.
2 shows a view A of FIG. 2 in FIG. 3, and a view B of FIG. 2 in FIG. The retaining member 6 is made of metal and has a cylindrical shape. The one end side is configured to prevent the ball 5 from falling out, and the inner peripheral side is configured to guide the radial position of the ball 5.
A large diameter hole 62 having a diameter larger than the outer diameter of the ball 5 is formed on one end side of the retaining member 6. Further, a protruding portion 63 projects from the outer periphery of the large diameter hole 62 toward the inner diameter side of the ball 5 with respect to the outer diameter thereof. The protrusions 63 are formed at three locations at equal intervals in the circumferential direction of the large diameter hole 62, and the protrusions 63 prevent the balls 5 from coming off. A guide portion 64 is formed on the inner peripheral side of the retaining member 6 so as to extend radially inward from the inner peripheral surface so as to be substantially the same as or slightly outside the outer diameter of the ball 5. The guide portion 64 extends in the axial direction along the projecting portion 63 so as to be at the same position as the projecting portion 63 in the circumferential direction. Is guided to move. Here, the circle shown by the dotted line in FIG. 4 is a circle along the inside of the guide portion 64, and has a size substantially the same as the outer diameter of the ball 5.

In this embodiment, the retaining member 6 is formed by pressing.

The coil device 3 has a cylindrical bobbin 31 made of resin and a coil 32 wound around the outer circumference of the bobbin 31.
A terminal 33 electrically connected to the coil 32 on one end side of the bobbin 31, a fixed core 7 formed of a magnetic body on the other end side of the bobbin 31, and a magnetic body on one end side of the bobbin 31. The movable core 8 is disposed on the inner periphery of the movable core 8 so as to be slidable in the axial direction. The fixed core 7 is inserted into the inner circumference on the other end side of the bobbin 31 and has a shape covering the outer circumference of the bobbin 31. A rod portion 81 having a diameter smaller than that of the through holes 45 and 48 is formed at one end of the movable core 8, and a drain valve portion 82 is further formed. The movable core 8 is constantly urged to the left in FIG. 1 by the coil spring 34 arranged between the movable core 8 and the fixed core 7. A cylindrical yoke 35 is formed on the inner peripheral surface of the bobbin 31 to facilitate the transfer of magnetism to and from the movable core 8.

Next, the operation of the solenoid valve 1 in this embodiment will be described. In the state shown in FIG. 1 in which the coil 32 is not energized, the magnetic attraction force is not acting between the movable core 8 and the fixed core 7, and the movable core 8 is the coil 3
It is biased to the left in FIG. 1 by two springs.
The urging force of the coil spring 34 is set to be sufficiently larger than the force of the fluid pressure sucked from the suction port 61 acting on the ball 5 to push the rod portion 81 to the right in FIG. The movable core 8 does not move to the right in FIG. 1 when 32 is not energized. Therefore, the movable core 8
The rod portion 81 of the ball 5 passes through the through holes 45 and 48.
To the left in FIG. In this state, the ball 5
Since it contacts the protrusion 63 of the retaining member 6 and does not contact the ball seat portion 44, the fluid sucked from the inlet 61 is discharged from the inside of the retaining member 6 through the through holes 45 and 48. It is introduced to 41. At this time, since the drain valve portion 82 of the movable core 8 is in contact with the valve seat portion 47, the fluid is not discharged from the discharge port 42. Therefore, all the fluid sucked from the suction port 61 is discharged from the discharge port 41, and the shift valve operates according to the discharged fluid pressure.

Next, when the coil 32 is energized from the state shown in FIG. 1, a magnetic attraction force acts between the movable core 8 and the fixed core 7. When the sum of the magnetic attraction force and the axial thrust force due to the fluid discharge pressure becomes larger than the biasing force of the coil spring 34, the movable core 8 moves to the right in FIG.
When the ball 5 and the rod portion 81 are separated from each other, the ball 5
Contacts the ball seat portion 44 of the first seat member 43. At the same time, the drain valve portion 82 and the valve seat portion 47 are separated from each other. In this state, the fluid sucked from the suction port 61 is not discharged toward the discharge port 41, and further,
Since the discharge port 41 and the discharge port 42 are in communication with each other, the discharge pressure supplied to the shift valve is discharged through the discharge port 42. In this way, the operation of the shift valve is also switched according to the switching of the coil 32 from non-energized to energized.

According to this embodiment, the protrusions 63 prevent the balls 5 from coming off, and the large diameter holes 62 are formed to have a diameter larger than the outer diameter of the balls 5.
When the coil 32 is not energized, the large diameter hole 6 of the retaining member 6
The flow rate loss of the fluid discharged toward the discharge port 41 via 2 becomes small, which is advantageous in performance.

Further, since the retaining member 6 is composed of a member different from the base 4, when forming the large diameter hole and the protruding portion in the retaining member 6, the retaining member 6 should be formed by a simple process such as pressing. Is possible, which is advantageous in manufacturing.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and for example, fluid pressure switching control is performed in addition to switching the shift valve of an automatic transmission. It goes without saying that it can be applied to a device. Further, the number of the protruding portions 63 of the retaining member 6 does not have to be three as long as the balls 5 can be retained.

[0020]

According to the present invention, the protrusion of the retaining member 6 reliably prevents the ball from falling off the base. Further, since the large diameter portion is larger than the outer diameter of the ball, when the fluid is sucked from the suction port, the fluid sucked from the outer peripheral side of the suction port (outer peripheral side of the large diameter hole) faces the ball. It goes to the discharge port without doing. Therefore, the flow rate loss of the fluid discharged from the discharge port is relatively small, and the flow rate of the fluid discharged can be increased with respect to the solenoid valve of the related art. Further, since the retaining member is made of a member different from the base, it is not necessary to mold the large diameter hole and the protruding portion together with the base, and it is possible to mold by a simple process such as press working, which is advantageous in manufacturing. .

[Brief description of drawings]

FIG. 1 is a sectional view of a solenoid valve 1 according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a retaining member 6 according to this embodiment.

FIG. 3 is a view from A of FIG.

FIG. 4 is a view from B of FIG.

[Explanation of symbols]

1 ... Solenoid valve 2 ... Valve mechanism 3 ... Coil device 4 ... Base 5 ... ball 6 ... retaining member 41 ... Discharge port 61 ... Suction port 62 ... Large diameter hole 63 ... Projection 64 ... Guide part

Claims (4)

[Claims] 1. A valve mechanism having a suction port for sucking a fluid and a discharge port for discharging the fluid, and a coil device connected to the valve mechanism and capable of switching the operation of the valve mechanism according to an energized state. An electromagnetic valve, wherein the valve mechanism includes a hollow cylindrical base having the discharge port, a suction port and a discharge port which are housed in the base and which are accommodated in the coil device according to an energization state to the coil device. The ball for communicating / blocking the spaces, and a member different from the base, having a suction port, and a retaining member for preventing the ball from falling out of the base, wherein the retaining member is A solenoid valve having a large diameter hole having a diameter larger than the outer diameter and a plurality of protrusions protruding from the outer circumference of the large diameter hole toward the inner diameter side of the outer diameter of the ball. 2. The protrusions of the retaining member are formed at three locations at equal intervals in the circumferential direction.
The solenoid valve according to claim 2. 3. The retaining member has a guide portion that extends in the axial direction between the ball and the inner peripheral surface of the base and guides the radial movement of the ball. The solenoid valve according to claim 1 or claim 2. 4. The retaining member according to claim 1, wherein the retaining member is formed by press working.
Solenoid valve described in.