JP2011127729A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light and inexpensive solenoid valve capable of preventing outbreaks of defective products due to deformation of a base and due to fastening when locking a ball guide in the base with a claw-like shape provided in a come-out preventing member by forming the ball guide from a resin material. <P>SOLUTION: This solenoid valve 10 includes: a valve part 12 having a suction port 41 and a discharge port 42; and a coil part 13 connected to the valve part 12 to operate the valve part 12 in response to the electrical continuing condition. The valve part includes: a hollow cylindrical base 14 having the discharge port 42; a ball 15 housed in the base part to communicate/cut between the suction port and the discharge port in response to the energization condition to the coil part 32; and a come-out preventing member 16 having the suction port and preventing fall-out of the ball 15 from the base; a large diameter hole 25 larger than the outer diameter of the ball 5; a first projecting part 26 projecting from the periphery of the large diameter hole 25 inward in the radial direction more than the outer diameter of the ball 15; and second projecting part 28 projecting from the periphery of the large diameter hole 25 outward in the radial direction of the fall-out preventing member 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solenoid valve used in an automatic transmission of an automobile such as an AT or a CVT.

  Conventionally, this type of solenoid valve is composed of a valve mechanism and a coil device connected to the valve mechanism, and the valve mechanism is accommodated in the base and has a hollow cylindrical base having a discharge port. A ball that communicates and blocks between the suction port and the discharge port according to the energized state, and a ball guide that is made of a member different from the base and has a suction port and prevents the ball from falling off the base ( For example, see Patent Document 1.)

JP 2003-314739 A

Patent Document 1 discloses that a concave groove directed in the axial direction is provided on the circumference of the end face of the base, and the concave shape is deformed by applying an external force or the like to fix the ball guide to the base.
In this case, the concave groove of the base to be fixed is thin, the shape of the base becomes complicated to form the concave groove, and the ball guide is made of a metal material, which makes it relatively heavy, and costs It is a factor that hinders reduction.
The present invention has been made in order to solve the problem, and is characterized in that the ball guide is formed of a resinous material, and the ball guide is locked to the base by a protruding portion provided on the retaining member. An object is to provide a solenoid valve.

In order to solve the above-mentioned problem, the invention according to claim 1 is a valve portion having a suction port for sucking fluid and a discharge port for discharging fluid.
A solenoid valve having a coil part connected to the valve part and capable of switching the operation of the valve part according to the energized state;
The valve portion is a hollow cylindrical base having the discharge port, and is housed in the base and communicates / blocks between the suction port and the discharge port according to the energization state of the coil portion. With the ball,
A ball guide made of a resinous member different from the base, having the suction port and preventing the ball from falling off the base;
The ball guide has a large diameter hole larger than the outer diameter of the ball, and is provided on one side of the ball guide and protrudes from the outer periphery of the large diameter hole toward the inner diameter side than the outer diameter of the ball material. A plurality of first protrusions;
A plurality of second protrusions provided on the other side of the ball guide and projecting toward the outer diameter side of the ball guide and engaging the ball guide;
A solenoid valve characterized by comprising:
The invention according to claim 2 is characterized in that the first and second projecting portions are formed at at least three equidistant positions in the circumferential direction.
According to a third aspect of the present invention, the ball guide 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. Characteristic solenoid valve.

  In the present invention, since the ball guide is locked to the base by the protrusion formed on the ball guide, it is reliably prevented from falling off the base. In addition, since the ball guide is locked to the base by the protruding portion, there is no waste product such as a defect due to deformation or caulking, so that the effect of improving productivity is great. Further, the ball guide is manufactured by resin molding, so that it can be manufactured at a light weight and at a low cost.

1 is a longitudinal sectional view of a solenoid valve according to an embodiment of the present invention. It is a principal part enlarged view which shows the structure of the base and ball guide of FIG. It is an expanded sectional view of the ball guide of FIG. It is the schematic of the A arrow direction of FIG.

Preferred embodiments of the solenoid valve of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of a solenoid valve 10 according to an embodiment of the present invention.
The solenoid valve 10 is connected to the valve portion 12 having a suction port for sucking fluid and a discharge port for discharging fluid, and switches the operation of the valve portion 12 according to the energized state (energized / non-energized). And a coil portion 13 (switching the communication state).

The valve portion 12 communicates between the suction port 41 and the discharge port 42 in accordance with the energized state of the coil portion 13 while being accommodated in the base 14 and the hollow cylindrical base 14 having the discharge port 42. A ball guide 16 that is made of a member different from the base 14 and has a suction port 41 and prevents the ball 15 from falling off the base 14, and a first guide that is inserted and fixed to the inner peripheral surface of the base 14. 1 sheet member 17 and a second sheet member 18 that is also inserted into and fixed to the inner peripheral surface of the base 14.
Further, the base 14 forms a discharge port (not shown) for discharging a fluid with a yoke 38 to be described later, and is connected to an oil pan (not shown) so as to be at atmospheric pressure. The suction port 41 communicates with an oil pump (not shown) and sucks the pressure oil discharged from the oil pump. The discharge port 42 communicates with a shift valve (not shown), and switches the position of the shift valve in accordance with the discharged fluid.

  Next, each structure of the valve part 12 is further demonstrated. The base 14 is made of a metal material, for example, aluminum, and is hollow so as to have different inner diameters by cutting, and the discharge port 42 is formed perpendicular to the axial direction of the base 14 so as to communicate with the hollow portion. The first seat member 17 is inserted and fixed from the left side of FIG. 1, and a ball seat portion 19 on which the ball 15 is seated is formed on one end side, and a through hole 20 is formed in the center. Further, the second seat member 18 is inserted into the base 14 from the right side of FIG. 1 and fixed, and a valve portion seat portion 23 for seating a drain valve portion 37 of a movable iron core 35 described later is formed on one end side and is also centered A through hole 24 is formed in the upper surface. A pin 22 is fixed to the movable iron core 35.

  The ball guide 16 that is the gist of the present invention will be described. 2 is an enlarged view of the main part showing the configuration of the base 14 and the ball guide 16, FIG. 3 is an enlarged cross-sectional view of the ball guide 16, and FIG. 4 shows the direction of arrow A in FIG. The ball guide 16 is formed of a resin material and has a cylindrical shape. The ball guide 16 is configured to prevent the ball 15 from falling off at one end side (left side in FIGS. 1 and 2) and to guide the radial position of the ball 5 on the inner peripheral side. Has been. The ball guide 16 is formed with a large diameter hole 25 having a diameter larger than the outer diameter of the ball 15.

  Further, a first projecting portion 26 projects from the outer periphery of the large-diameter hole 25 toward the inner diameter side of the outer diameter of the ball 15 on one end side (left side in FIG. 1) of the ball guide 16. A plurality of, eg, three, first protrusions 26 are formed at regular intervals in the circumferential direction, and the balls 15 are prevented from coming off by the first protrusions 26. On the inner peripheral side of the ball guide 16, a guide portion 27 is formed that extends radially inward from the inner peripheral surface so as to be slightly on the outer diameter side of the ball 15. The guide portion 27 extends in the axial direction along the protruding portion 26 so as to be in the same position as the first protruding portion 26 with respect to the circumferential direction, and the guide portion 27 allows the ball 15 in the ball guide 16 to move. Movement in the radial direction is guided.

  Further, on the other end side (right side in FIGS. 1 and 2) of the ball guide 16, a second protruding portion 28 that protrudes in the outer diameter direction of the ball guide 16 is formed. When the ball guide is inserted, the second protruding portion 28 is fitted into the groove portion of the base and is locked with the base. A plurality of, for example, three, second protrusions 28 are formed at equal intervals in the circumferential direction. In this case, the first and second protrusions 26 and 28 may or may not have the same circumferential position, but the ball guide 16 is molded, for example, injection molded at the same position. In some cases, the structure of the mold can be easily molded, and the cost can be reduced.

The coil unit 13 includes a cylindrical bobbin 31 formed of a resinous material, a coil 32 wound around the outer periphery of the bobbin 31, a terminal 33 electrically connected to the coil 32 on one end side of the bobbin 31, A movable iron core made of a magnetic material and having a pin 22 formed on the other end of the bobbin 31 and a pin 22 made of a magnetic material and slidably disposed on the inner periphery of the bobbin 31 in the axial direction. 35.
The fixed iron core 34 is inserted into the inner periphery on the other end side (the right side in FIG. 1) of the bobbin 31 and has a shape that covers the outer periphery of the bobbin 31. A rod portion 36 having a smaller diameter than the through holes 20 and 24 is formed at one end (left end in FIG. 1) of the movable iron core 35, and a drain valve portion 37 is further formed. The movable iron core 35 is always urged leftward in FIG. 1 by a coil spring 39 disposed between the movable iron core 35 and the fixed iron core 34. A cylindrical yoke 38 is formed on the inner peripheral surface of the bobbin 31 to facilitate the transfer of magnetism with the movable iron core 35.

  Next, the operation of the solenoid valve 10 in this embodiment will be described. In the state shown in FIG. 1 where the coil 32 is not energized, no magnetic attractive force acts between the movable iron core 35 and the fixed iron core 34, and the movable iron core 35 is shown by the elastic force of the coil spring 39. 1 is biased to the left. The spring force of the coil spring 39 is set sufficiently larger than the force by which the fluid sucked from the suction port 41 acts on the ball 15 and the ball 15 presses the rod portion 36 in the right direction in FIG. When the coil 32 is not energized, the movable iron core 35 does not move in the right direction.

  Therefore, the rod portion 36 of the movable iron core 35 penetrates the through holes 20 and 24 and presses the ball 15 in the left direction in FIG. In this state, the ball 15 abuts on the first protrusion 26 of the ball guide 16 and does not abut on the second ball seat portion 17, so that the fluid sucked from the suction port 41 flows from the inside of the ball guide 16. It is introduced into the discharge port 42 through the through holes 20 and 24. At this time, since the drain valve portion 37 of the movable iron core 35 is in contact with the valve portion seat portion 23, the fluid is not discharged from the discharge port. Accordingly, all of the fluid sucked from the suction port 41 is discharged from the discharge port 42, 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 attractive force acts between the movable iron core 35 and the fixed iron core 34. When the sum of the magnetic attraction force and the axial thrust force due to the fluid discharge pressure becomes larger than the elastic force of the coil spring 39, the movable iron core 35 moves to the right in FIG. The ball 15 is in contact with the ball sheet portion 19 of the first sheet member 17 while being separated from the ball 36. At the same time, the drain valve portion 37 and the valve seat portion 23 of the movable iron core 35 are separated from each other.

  In this state, the fluid sucked from the suction port 41 is not discharged toward the discharge port 42, and the discharge port 41 and the discharge port (not shown) are in communication with each other, so that the fluid is supplied to the shift valve. The discharged pressure is discharged through the discharge port. In this way, the operation of the shift valve is also switched in accordance with the switching of the coil 32 from non-energized to energized.

  According to the embodiment of the present invention, the ball 15 is prevented from coming off by the first protrusion 26, and the large-diameter hole 25 is formed radially outside the outer diameter of the ball 15, When the coil 32 is not energized, the flow loss of the fluid discharged toward the discharge port 42 through the large-diameter hole 25 of the ball guide 16 is reduced, which is advantageous in terms of performance.

Further, since the ball guide 16 is made of a member different from the base 14, for example, a resinous material, when the large-diameter hole 25 and the first and second projecting portions 26 and 28 are formed in the ball guide 16, an injection is performed. Molding can be performed, which is advantageous in manufacturing.
Further, the ball guide 16 is fixed because it does not apply a large external force or the like by being fitted and locked in the groove portion of the base when the ball guide 16 is inserted by the second protrusion 28 without caulking the base 14. There is little waste product such as deformation or defect due to.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, an apparatus for switching control of fluid pressure in addition to switching of a shift valve of an automatic transmission. Needless to say, it can be applied. Further, the number of the first and second protrusions 26 and 28 of the ball guide 16 may not be three as long as the ball 15 can be prevented from coming off.

DESCRIPTION OF SYMBOLS 10 Solenoid valve 12 Valve part 13 Coil part 14 Base 15 Ball 16 Ball guide 17, 18 Seat member 19 Ball seat part 20, 24 Through hole 22 Pin 25 Large diameter hole 26, 28 Projection part 27 Guide part 31 Bobbin 32 Coil 33 Terminal 34 Fixed iron core 35 Movable iron core 36 Small diameter rod part 37 Drain valve part

Claims (3)

A valve portion having a suction port for sucking fluid and a discharge port for discharging the fluid;
A solenoid valve having a coil portion connected to the valve portion and capable of switching the operation of the valve portion in accordance with an energized state;
The valve unit is a hollow cylindrical base having the discharge port, and is housed in the base and communicates and blocks between the suction port and the discharge port in accordance with the energization state of the coil device. With the ball,
A ball guide made of a resinous member different from the base, having the suction port and preventing the ball from falling off the base;
The ball guide has a larger diameter than the outer diameter of the ball and guides the ball member, and an outer diameter of the large diameter hole provided on one side of the ball guide from the outer diameter of the ball. A plurality of first protrusions protruding toward the side;
A plurality of second protrusions provided on the other side of the ball guide and projecting toward the outer diameter side of the ball guide and engaging the ball guide;
A solenoid valve characterized by comprising: The solenoid valve according to claim 1, wherein
The solenoid valve according to claim 1, wherein the first and second protrusions are formed at at least three locations at equal intervals in the circumferential direction. The solenoid valve according to claim 1 or 2,
The ball guide has a guide portion that extends in an axial direction between the ball and an inner peripheral surface of the base and guides the movement of the ball in a radial direction.

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