JP2013092228A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve having a strainer capable of preventing a foreign object from entering inside of a control valve while lowering costs.SOLUTION: An annular groove 44 is provided on an external side of a supply port 29 in a sleeve 24, and an arc-shaped strainer 42 having a mesh part 45 and a rotation stop shape 43 is attached to the sleeve 24 to position a W-shaped cross section 43 on the supply port 29. The W-shaped cross section 43 of the strainer 42 covers the supply port 29, so that the solenoid valve has a rotation stop function for the strainer 42.

Description

  The present invention relates to a solenoid valve, and more particularly to a solenoid valve having a strainer attached thereto.

  Conventionally, a hydraulic circuit of an automatic transmission has been provided with various control valves such as a pressure control valve that controls pressure, a flow control valve that controls flow rate, and a directional control valve that controls flow direction. By operating, oil is supplied to a predetermined hydraulic servo to engage a clutch, a brake, etc., thereby achieving a predetermined shift stage.

  Each of the various control valves includes a sleeve, a spool disposed in the sleeve so as to freely advance and retreat, a spring for urging the spool in a predetermined direction, and a solenoid portion for advancing and retreating the spool as necessary. Is provided. The sleeve is formed with ports such as an inlet port for supplying oil to the control valve and an outlet port for discharging oil from the control valve. By setting the control valve on the valve body, the valve body The formed flow path and each port communicate with each other.

  By the way, when foreign matter such as iron powder enters the control valve, the foreign matter enters between the sleeve and the spool, and locks or damages the control valve. Therefore, a strainer having a filter structure is attached to the strainer mounting portion of the sleeve from the outside so as to cover each port, the inner peripheral surface of the strainer and the outer peripheral surface of the strainer mounting portion are in close contact with each other, and the ports are sealed. The foreign matter is prevented from entering the valve (for example, Patent Document 1).

Japanese Patent No. 4400606

In the control valve of Patent Document 1, the strainer is provided with a rotation stopper using an inlet port and an outlet port which are port-shaped portions, and a hook portion provided in the rotation stopper is brought into contact with the sleeve of the control valve.
However, compared to the case where no strainer is installed in the port shape portion, the flow rate loss of the fluid (low temperature) due to the installation of the strainer increases. Further, since the hook portion is formed on the outer diameter portion of the strainer, the material of the strainer is large and the number of one mold is reduced, so that the material unit price for creating the strainer is high.

  The present invention has been made in order to solve the problems of the conventional control valve, and can prevent a foreign substance from entering the control valve and can reduce the cost, thereby providing a solenoid valve having a strainer. The purpose is to provide.

In order to solve the above problems, the present invention according to claim 1
Port,
A sleeve in which a strainer mounting portion provided outside the port corresponding to the port is formed;
A spool disposed in the sleeve so as to freely advance and retract;
A strainer attached to the strainer attaching portion;
In a solenoid valve with
The strainer is characterized in that a mesh portion is formed and a portion corresponding to the port opening has a detent shape.
The invention according to claim 2 is characterized in that the strainer has a W-shaped cross section.

According to the present invention, since the area of the fluid flowing in the port is increased by installing a strainer having a non-rotating shape in the strainer mounting portion, the loss of the fluid amount can be reduced.
Further, when the strainer is attached to the strainer attachment portion, it is not necessary to stop the strainer, so that the strainer material can be reduced and the cost of the solenoid valve can be reduced.

1 is a schematic longitudinal sectional view of a solenoid valve according to a first embodiment of the present invention. FIG. 2 is a main part outline view of the sleeve of FIG. 1. It is a principal part external view of the sleeve which attached the strainer. It is sectional drawing of the IV-IV line of FIG. It is a perspective view of a strainer. It is a schematic longitudinal cross-sectional view of the solenoid valve which concerns on the 2nd Embodiment of this invention. It is a principal part external view of the valve part 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 schematic longitudinal sectional view of a solenoid valve 10 according to a first embodiment of the present invention.
The solenoid valve 10 includes a housing 11 made of a magnetic metal material, and the housing 11 includes a cylindrical portion 12 and a flange portion 13. A fitting hole 14 is formed through the inside of the housing 11. In this case, the cylindrical portion 12 has a function as a fixed iron core. The bearing mechanism 15 fitted in the fitting hole 14 includes a cylindrical retainer 16 having a relatively thin thickness along the axial direction, and a magnetic metal ball 17 inserted into the retainer 16. It has a guide function when the rod 18 described later is displaced in the axial direction.

A solenoid valve coil assembly 19 is disposed on the outer periphery of the housing 11, and the outer periphery of the solenoid valve coil assembly 19 is covered with a cover 21. The coil assembly 19 for the solenoid valve includes a coil 19a in which a conducting wire (not shown) is wound around the outer periphery of the bobbin 20, a flange portion 20a, 20b of the bobbin 20, a mold member 20c that covers the outer periphery of the coil 19a, Is provided.
The inner peripheral surface 22 of the bobbin 20 is fitted to the outer peripheral surface of the inner cylindrical portion 21 a of the cover 21, and the movable member fixed to the rod 18 is fixed to the inner peripheral surface 22 of the inner cylindrical portion 21 a of the cover 21. An iron core 23 is loosely fitted so as to be freely displaceable.

Reference numeral 24 denotes a cylindrical sleeve, and is integrated with the housing 11 by, for example, crimping one end of the cover 21 in contact with the housing 11. A sleeve hole 25 and a sleeve hole 26 are formed in the sleeve 24 coaxially with the fitting hole 14, and a spool 27 is slidably fitted into the sleeve hole 25 and the sleeve hole 26. In the sleeve 24, a feedback port 28, a supply port 29, an output port 30, and a drain port 31 are formed in this order from the housing 11 side.
The supply port 29 is adapted to allow the pressure fluid supplied from the tank by a pump (not shown) to flow in and adjust the hydraulic pressure of the pressure fluid supplied to the output port 30.

FIG. 2 is a perspective view showing the outer shape of the sleeve 24, FIG. 3 is an outer view in which a strainer 42 is attached to the supply port 29 of the solenoid valve 10, and FIG. 4 is a sectional view taken along line IV-IV in FIG. FIG. 5 shows an external view of the strainer 42.
1 to 3, the supply port 29 is formed with an opening opening in the radial direction of the sleeve 24, for example, a U-shaped opening 45, and the guide hole portion of the supply port 29 has an outer periphery of the sleeve 24. An annular groove 44 (strainer attaching portion) is formed on the surface, and the strainer 42 is attached to the annular groove 44.

The strainer 42 (see FIG. 5) is, for example, a thin stainless steel plate formed into a semicircular curve, and forms a mesh portion 45 over substantially the entire surface thereof, and both ends of the mesh portion 45 are formed on the strainer. The elastic force of 42 is brought into close contact with the outer peripheral surface of the sleeve 24. Then, the strainer 42 is pushed into the annular groove 44 of the sleeve 24 from above the supply port 29 so as to spread both ends, and is fixed to the annular groove 44 by the elastic force of the strainer 42 itself.
Although the solenoid valve 10 of the present embodiment has been described with the strainer 42 attached to the supply port 29, the solenoid valve 10 may be attached to the feedback port 28 and the outlet port 30.
Further, the strainer 42 may be attached to the opening 43 in a U-shaped cross section or a circular arc shape.

The spool 27 includes a small-diameter portion 32 and a large-diameter portion 33 that are slidably inserted into the sleeve hole 25 and the sleeve hole 26, respectively. The end face (left end in FIG. 1) of the small-diameter portion 32 is always in contact with one end (right end in FIG. 1) of the rod 18 urged by the spring force of a spring member 35 described later. The spring member 35 is accommodated in the sleeve hole 26, and one end (left end in FIG. 1) abuts the end surface (right end surface in FIG. 1) and the other end (right end in FIG. 1) is the sleeve 24. It abuts against the recess of the adjuster 36 screwed to the end face.
In this case, the elastic force of the spring member 35 is adjusted by the tightening amount of the adjuster 36, and the pressing force (or biasing force) of the spool 27 to the rod 18 is adjusted by adjusting the tightening amount of the adjuster 36. . As a result, the spool 27 is urged in the direction of the arrow Y against the elastic force of the spring member 35 by the movement of the movable iron core 23 and the rod 18 by the excitation of the coil assembly 19 for the solenoid valve, and the coil for the solenoid valve When the assembly 19 is de-energized and is urged in the direction of the arrow X by the elastic force of the spring member 35, the sleeve 24 is displaced in the directions of the arrow Y and X in cooperation with the rod 18.

  The large diameter portion 33 of the spool 27 is connected between a land 37 for connecting / blocking between the supply port 29 and the output port 30 according to the axial center position of the spool 27 and between the output port 30 and the drain port 31. A land 38 to be blocked is provided along the axial direction. The lands 37 and lands 38 are provided at intervals in the axial direction, and the lands 37 and 38 are connected by a shaft portion 39 smaller than the outer diameter of the large-diameter portion 33. Therefore, the land 37 and the land 38 and the shaft portion 39 are stepped in the diameter direction, and the opening 40 is formed in the diameter direction with respect to the sleeve hole 26. The opening 40 functions as an oil passage that connects the land 37 and the land 38.

A feedback chamber 41 is formed between the small-diameter portion 32 and the land 37, and the pressure-receiving area on which the pressure fluid fed back varies depending on the outer diameter difference between the small-diameter portion 32 and the land 37. Therefore, the pressure fluid flowing into the feedback chamber 41 always acts to press the spool 27 in the arrow Y direction.
On the other hand, the spool 27 has a feedback chamber and a force by which the rod 18 pushes the spool 27 by an elastic force of the spring member 35 and an electromagnetic force generated in the fixed iron core 12 by an electric current supplied to the solenoid valve coil assembly 19. It stops at a position where the force received by the spool 27 from the pressure fluid 41 is balanced.

  The flow rate of the pressure fluid flowing from the supply port 29 into the output port 30 is determined by the seal length of the overlapping portion between the inner peripheral wall (not shown) of the sleeve 24 and the outer peripheral wall of the land 37. That is, when the seal length is shortened, the flow rate of the fluid flowing from the supply port 29 to the output port 30 is increased, and when the seal length is increased, the flow rate of the fluid flowing from the supply port 29 to the output port 30 is decreased. Similarly, the flow rate of the fluid flowing from the output port 30 to the drain port 31 is determined by the seal length between the inner peripheral wall of the sleeve 24 and the outer peripheral wall of the land 38.

  FIG. 6 is a schematic longitudinal sectional view in which a strainer 77 is attached to the three-way two-position normal close valve 50 according to the second embodiment of the present invention.

As shown in FIG. 6, the fixed iron core 51 includes a cylindrical portion 53 having a space portion 52 having a concave cross section and a flange portion 55 provided at an opening end 54 of the space portion 52. A drain through hole 57 is provided in the bottom 56 of the cylindrical portion 53 of the space 52. A solenoid coil 58 is inserted so as to contact the outside of the cylindrical portion 53 of the fixed iron core 51 and the outer peripheral surface of the cylindrical portion of the flange portion 55.
A cylindrical iron yoke 59 having an L-shaped cross section is fixed to the lower end of the bobbin 58a. The terminal portion 60 protrudes in the radial direction from below the bobbin 58a, and power is supplied from the outside.

  A movable iron core 61 is provided so as to be movable along the lower end of the fixed iron core 51 and the inner diameter of the bobbin 58a. The movable iron core 61 has a hollow cylindrical shape having a concave hole 61a, and a pin 62 is fixed to the bottom. A spring member 63 is provided in the recessed hole 61a, and the upper portion of the spring member 63 abuts on the lower end of the fixed iron core 51 so that the fixed iron core 51 and the movable iron core 61 are separated by the elastic force of the spring member 63. Has been. A valve portion 64 is provided below the movable iron core 61 and the yoke 59. The valve portion 64 has a flange 64 a at the top, and is fixed by crimping so that the flange 64 a, the yoke 59, the solenoid coil 58, and the flange portion 55 of the fixed iron core 51 are sandwiched between both ends of the cover 65.

  A valve seat (hereinafter referred to as a first valve seat) 66 having a supply port and a valve seat (hereinafter referred to as a second valve seat) 67 having a drain port are fitted and inserted into the concave hole 64b. In this case, the coupling between the concave hole 64b of the valve portion 64 and the second valve seat 67 integrally forms the valve portion 64 and the second valve seat 67 by rolling caulking.

  A pressure port 68 communicating with the supply port 75 is formed in the first valve seat 66 fitted into the concave hole 64b of the valve portion 64, and a pressure port side valve seat 69 opening upward, the pressure port side valve seat. A ball 70 to be seated on and off 69 is provided. A tank port side valve seat 71 opening downward is provided on the upper side of the ball 70, and the ball 70 is arranged so as to be able to be seated. A load port 72 is provided in communication between the pressure port side valve seat 69 and the tank port side valve seat 71, and is connected to a supply path (not shown). The tank port side valve seat 71 is connected to the pin through hole 73, is connected to the tank port 76 via the tank hole 74, and is discharged to the outside of the solenoid valve 10.

Reference numeral 77 is a strainer attached to the supply port 75, and the strainer 77 shown in FIG. 5 is mounted as shown in FIGS.
The tip of the pin 62 of the movable iron core 61 can be brought into contact with the ball 70 by the elastic force of the spring member 63. When the solenoid coil 58 is energized, the pin 62 is attracted to the fixed iron core 51 side. Avoid contact.

Claims (2)

Port,
A sleeve in which a strainer mounting portion provided outside the port corresponding to the port is formed;
A spool disposed in the sleeve so as to freely advance and retract;
A strainer attached to the strainer attaching portion;
In a solenoid valve with
The strainer has a mesh portion and has a non-rotating shape at a portion corresponding to the port opening. The solenoid valve according to claim 1, wherein
The solenoid valve according to claim 1, wherein the non-rotating shape of the strainer has a W-shaped cross section.

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