JP2005344903A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve with pressure release passages formed by reducing the thickness of a bearing member for displaceably supporting a rod in a sliding hole of a cylindrical portion. <P>SOLUTION: The solenoid valve 10 has a housing 11 consisting of the cylindrical portion 12 and a flange portion 13. The housing 11 has a fitting hole 14 in which a bearing mechanism is provided. The bearing mechanism 15 has the thin cylindrical bearing member 16 and a ball 17 inserted through the bearing member 16. The bearing member 16 has protruded portions 19a-19c so as to be positioned on the rod 18. In the inner diameter of the bearing member 16, cut-off grooves 20a-20c are formed adjacent to the protruded portions 19a-19c among the protruded portions 19a-19c. The cut-off grooves 20a-20c are used as the pressure release passages in the solenoid valve 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic valve that controls a pressurized fluid by displacing a spool in accordance with an applied current, and more particularly to an improvement in a bearing mechanism that supports a rod that is displaced by mounting a movable iron core.

Conventionally, a solenoid is disposed outside the fixed iron core, a fitting hole is formed inside the fixed iron core, a cylindrical outer ring is inserted into the fitting hole, a ball is inserted inside the outer ring, and the ball There is an electromagnetic actuator that is provided with a retainer for holding the rod, supports the rod so as to be displaceable by the ball, and smoothly operates the rod and the fixed iron core fixed to the rod (for example, Patent Document 1 and Patent) Reference 2).
Patent document 1 and patent document 2 aim at supporting the rod of an electromagnetic valve with a ball | bowl, and making it operate | move smoothly. In Patent Document 1, a retainer is fixed to a fixed iron core, and a ball is formed separately from the retainer. In Patent Document 2, a gap between the retainer and the outer ring / rod is not secured.
JP-A-1-316582 Japanese Examined Patent Publication No. 45-4583

However, in Patent Document 1, since the ball and the retainer are separate bodies, the assembling work becomes complicated and the cost is high, and the gap between the rod and the retainer is structurally small. There was a problem of not functioning as a passage. In Patent Document 2, the ball can be assembled to the retainer in advance. However, since the eccentric amount of the retainer needs to be regulated in order to operate the ball smoothly, the clearance between the retainer and the outer ring / rod is increased. Since this was not possible, it was necessary to provide a separate pressure relief passage.
The present invention has been made to solve the above problems, and provides a solenoid valve characterized in that a shape of a retainer for holding a ball is changed to form a pressure relief passage in a space around the ball. For the purpose.

In order to achieve the above object, the present invention provides a solenoid disposed on the outer periphery of the housing, and a fitting hole is formed in the housing. The fitting hole is inserted into the fitting hole to support the rod and cooperate with the rod. In a solenoid valve equipped with a bearing mechanism that
The bearing mechanism is
A projecting portion having a plurality of joining surfaces arranged in a circumferential direction and projecting radially on the inner peripheral surface at both ends of the cylindrical shape and oriented in the axial direction and joined to the outer peripheral surface of the rod. A plurality of notch grooves that are adjacently oriented in the axial direction, and a bearing member having an inner peripheral surface formed on the bottom surface of the notch groove;
A spherical member that is rotatably inserted in the circumferential direction of the bearing member;
With
The protruding portion is engaged with the rod to support the rod, the spherical member abuts on the inner peripheral surface of the fitting hole and the outer peripheral surface of the rod, and the notch groove is used for an oil passage. Features.
According to the present invention, since the bearing mechanism can provide the oil passage by reducing the thickness of the bearing member, it is easy to release the pressure in the solenoid valve and improve the response of the solenoid valve. Can do.
In this case, if the joining surface joined to the outer peripheral surface of the rod is formed in an arc shape, the joining surface of the projecting portion can be reliably joined to the outer peripheral surface of the rod, and the rod can be stably It is good because it can be operated.
Furthermore, since the bearing member can be elastically deformed and held by the spherical member press-fitted into the bearing member, the bearing member can be assembled in a separate process in advance. Becomes easy, the assembly time is shortened, and the cost can be reduced.
In this case, it is preferable that the arc shape is formed along the outer peripheral surface of the rod or a curved surface protruding inward in the radial direction because the pressure in the electromagnetic valve can be easily released.

According to the present invention, the bearing member and the rod can be secured as a passage for oil by reducing the thickness of the bearing member and providing a protrusion and a notch groove for joining to the rod. Can be easily released, and the responsiveness of the solenoid valve can be improved.
Furthermore, in the present invention, since the rod is supported by the protruding portion of the bearing member, the rod can be stably operated.

A solenoid valve 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a schematic structure of a solenoid valve 10 according to an embodiment of the present invention. 2 is a side view of the bearing mechanism 15, and FIG. 3 is a cross-sectional view of FIG.
The electromagnetic 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.

As shown in FIGS. 2 and 3, the bearing mechanism 15 includes a cylindrical resin bearing member 16 that is relatively thin along the axial direction, and a magnetic metal that is inserted into the bearing member 16. And a ball 17 made of metal. The bearing member 16 is formed with a plurality of, for example, three 19a to 19c in the circumferential direction on the inner diameter side, with a pair of protruding portions 19 for positioning the rod 18 at both ends. The protrusions 19a to 19c are formed in a substantially trapezoidal vertical cross section, and an arc-shaped joining surface 21 is formed along the axial direction at the tip joined to the outer peripheral surface of the rod 18. One side of the joint surface 21 is radially expanded and communicated with a bottom surface of a notch groove 20 described later, that is, an inner peripheral surface 22. In addition, although it is desirable that at least three protrusions 19 are formed, it is of course possible to form 4-8.
Therefore, the bearing member 16 supports the rod 18 by the pair of protrusions 19 and is formed integrally with the rod 18, so that the fitting hole 14 is displaced in the axial direction together with the rod 18. For this reason, the protrusions 19a to 19c have a guide function when the rod 18 is displaced in the axial direction.

As shown in FIG. 3, on the inner diameter side of the bearing member 16, a plurality of cutout grooves 20 are formed between the protrusions 19a to 19c and directed to the outer diameter side adjacent to the protrusions 19a to 19c, that is, the cutout grooves 20a. ~ 20c are formed. An inner peripheral surface 22 is formed on the bottom surface of the notch grooves 20a to 20c and can be used as a pressure release passage in the electromagnetic valve 10. A plurality of, for example, three balls (spherical members) 17, for example, three balls (spherical members) 17 are rotatably fitted in spherical holes (concave portions) 23 at equal intervals in the circumferential direction at positions spaced along the axial direction. It is. In this case, the circumferential position of the ball 17 is provided, for example, on the same axis as the center of the projecting portions 19a to 19c along the axial direction, but may be provided at substantially the center of the width of the cutout grooves 20a to 20c. Of course. The ball 17 is rotatably inserted in the hole 23 and is mounted so as not to be detached from the hole 23. In addition, when the ball 17 is inserted into the bearing member 16, for example, it is performed by press-fitting.
Therefore, as shown in FIGS. 2 and 3, when the ball 17 is fitted into the bearing member 16, a part of the outer diameter portion of the ball 17 protrudes from the hole 23 of the bearing member 16. Has been.

As for the front-end | tip part of protrusion part 19a-19c, although the joining surface 21 joined to the outer peripheral surface of the rod 18 is formed in the circular arc shape along the outer peripheral surface of this rod 18, the outer peripheral surface of the rod 18 is shown in FIG. You may form in the circular-arc-shaped protrusion part 38a-38c which the front-end | tip part joined to this protrudes inward in the radial direction.
A solenoid 24 is disposed on the outer periphery of the housing 11, and the solenoid 24 is covered with a cover 25 by winding a coil 24 b around a bobbin 24 a. A nonmagnetic end cover 26 is in contact with one end of the solenoid 24, and one end of the cover 25 is fixed to the end cover 26. A hole 27 is formed in the cover 25 coaxially with the fitting hole 14 of the housing 11, and a movable iron core 28 fixed to the hole 27 rod 18 is loosely fitted freely.

  Reference numeral 29 denotes a sleeve, which is integrated with the housing 11 by, for example, crimping one end of the cover 25 in contact with the housing 11. A sleeve hole 30 is formed in the sleeve 29 coaxially with the fitting hole 14, and a spool 31 is slidably inserted into the sleeve hole 30. In the sleeve 29, a tank passage 32 that communicates a tank (not shown) and a sleeve hole 30, a control passage 33 that communicates an actuator (not shown) and the sleeve hole 30, and a pump and sleeve hole 30 (not shown). And a supply passage 34 communicating with each other.

  The spool 31 includes a first land portion 35 and a second land portion 36 that are formed along the axial direction with a space therebetween. The first land portion 35 allows the tank passage 32 and the control passage 33 to be separated from each other. Communication control is performed, and communication control between the control passage 33 and the supply passage 34 is performed by the second land portion 36. An adjuster 37 is screwed into the sleeve hole 30, and a spring member 38 is interposed between the adjuster 37 and the second land portion 36 to urge the spool 31 in a direction to contact the rod 18. .

The electromagnetic valve 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation thereof will be described.
In FIG. 1, the solenoid 24 is de-energized, the spool 31 is displaced in the direction of the arrow X by the elastic force of the spring member 38, and the tank path 32 and the control path 33 are kept in communication with each other by the first land portion 35. Thus, the supply passage 34 is closed by the second land portion 36. At this time, the rod 18 is pressed by the spool 31 and displaced in the arrow X direction.

When a current is applied to the solenoid 24, magnetic lines of force passing through the cover 25, the fixed iron core 12, and the movable iron core 28 are generated, and the movable iron core 28 is displaced in the arrow Y direction against the elastic force of the spring member 38.
Therefore, the rod 18 is displaced in the arrow Y direction. At this time, since the ball 17 inserted into the bearing member 15 rotates in contact with the inner peripheral surface of the cylindrical portion 12 and the outer peripheral surface of the rod 16, sliding resistance due to displacement of the rod 18 is reduced. Furthermore, since the pressure relief in the solenoid valve 10 is performed by the notch groove 20 formed in the bearing member 16, the rod 18 can be displaced more lightly.

  When the spool 31 is displaced in the direction of arrow Y, the opening degree of the passage from the control passage 33 to the tank passage 32 increases, and the passage from the supply passage 34 to the control passage 33 rises to a pressure controlled by a pump (not shown). To do. The displacement of the spool 31 in the arrow X direction is adjusted by contacting the adjuster 37 via the spring member 38, and the operation of the spool is controlled.

  In the solenoid valve 10 according to the embodiment of the present invention, since the thickness of the bearing member 16 of the bearing mechanism 15 that supports the rod 18 can be reduced, a pressure relief passage in the solenoid valve 10 is formed in the bearing member 16. Therefore, it is possible to reduce the sliding resistance when the rod 18 is displaced. Although the electromagnetic valve 10 according to this embodiment has been described as a normal electromagnetic valve, it can also be applied to a proportional electromagnetic valve.

It is a longitudinal section showing a schematic structure of a solenoid valve concerning an embodiment of the invention. It is a side view which shows schematic structure of the bearing mechanism of FIG. It is sectional drawing of the II-II line of FIG. FIG. 6 is a schematic structural diagram showing a modification of the protruding portion in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Solenoid valve 11 Housing 12 Cylindrical part 15 Bearing mechanism 16 Bearing member 17 Ball 24 Solenoid 28 Movable iron core 29 Sleeve 31 Spool

Claims (5)

In a solenoid valve provided with a bearing mechanism in which a solenoid is disposed on the outer periphery of the housing, a fitting hole is formed in the housing, the rod is inserted into the fitting hole to support and cooperate with the rod,
The bearing mechanism is
A projecting portion having a plurality of joining surfaces arranged in a circumferential direction and projecting radially on the inner peripheral surface at both ends of the cylindrical shape and oriented in the axial direction and joined to the outer peripheral surface of the rod. A plurality of notch grooves that are adjacently oriented in the axial direction, and a bearing member having an inner peripheral surface formed on the bottom surface of the notch groove;
A spherical member that is rotatably inserted in the circumferential direction of the bearing member;
With
The protruding portion is engaged with the rod to support the rod, the spherical member abuts on the inner peripheral surface of the fitting hole and the outer peripheral surface of the rod, and the notch groove is used for an oil passage. Characteristic solenoid valve. The solenoid valve according to claim 1, wherein
The projecting portion is a solenoid valve characterized in that a joint surface joined to an outer peripheral surface of the rod is formed in an arc shape. The solenoid valve according to claim 1 or 2,
The electromagnetic valve, wherein the bearing member is elastically deformed by a spherical member press-fitted into the bearing member and holds the spherical member. The solenoid valve according to claim 2,
The electromagnetic valve according to claim 1, wherein the arc shape is formed along an outer peripheral surface of the rod. The solenoid valve according to claim 2,
The arcuate valve is formed on a curved surface projecting inward in the radial direction.

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