JPH0557555U - solenoid - Google Patents

Abstract

(57) [Abstract] [Purpose] The movable plunger does not rattle in the radial direction, and the flow passage area provided on the outer circumference of the plunger is sufficiently secured to improve the performance. A structure is characterized in that a hole 51 is provided in one end surface of a movable plunger 5, and a guide member 10 for guiding reciprocating movement of the movable plunger 5 is slidably provided in a peripheral surface of the hole 51. .

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a solenoid used in, for example, a solenoid valve, and more particularly to a structure having a flow passage on the outer circumference of a movable plunger.

[0002]

[Prior Art]

 As a conventional solenoid of this type, there is a solenoid used in a solenoid valve as shown in FIGS. 6 to 8, for example. That is, reference numeral 100 denotes the entire solenoid main body. This solenoid main body 100 includes a core 101, a bobbin 103 formed of resin around a coil 102 arranged so as to surround the core 101, and a bobbin 103 thereof. And a movable plunger 104 that is reciprocally inserted into the hollow interior of the. The coil 102 is housed in a hollow case 105, and an upper plate 106 that guides a magnetic path from the case 105 to the plunger 104 is provided above the coil 102. Further, an upper plate 106 is provided on the upper plate 106 in the axial direction of the plunger 104. A stopper plate 107 that restricts movement is provided.

Then, by exciting the coil 102, a reciprocating drive of the plunger 104 is performed by using a magnetic attraction force formed by forming a closed loop magnetic path from the case 105, the upper plate 106, the plunger 104, and the core 101. It has become .

The bobbin 103 is provided between the outer circumference of the plunger 104 and the inner circumference of the bobbin 103 in order to secure a flow passage area of the flow passage 108 that allows the fluid to flow on both end surfaces of the plunger 104. A plurality of ribs 109 that are slidable with the outer circumference of the plunger 104 as shown in FIG. The rib 109 serves as a guide member that guides the reciprocating movement of the plunger 104.

[0005]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional technique, since the plunger 104 only uses several ribs 109 formed of resin as bearings, the radial play of the plunger 104 becomes large. Therefore, when applied to the solenoid valve as shown in FIG. 6 shown in the above prior art, the plunger 104 forms a valve body, and the core 101 forms a valve seat. Since it does not come into direct contact with 101, it is difficult to reliably hold the hydraulic pressure from the input side flow passage 110 opened in the core 101.

Further, since the bearing portion composed of the rib 109 is made of resin, if the clearance between the plunger 104 and the bearing portion is reduced in order to reduce the play of the plunger 104, which is the above problem, the thermal expansion of the resin causes the plunger 104, The bearing portion including the rib 109 may be fixed.

On the other hand, since there are several ribs 109 in the flow path 108 provided on the outer circumference of the plunger 104, there is a drawback that the flow path area is inevitably small.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The purpose of the present invention is to prevent the movable plunger from rattling in the radial direction, and to provide the flow provided on the outer circumference of the plunger. An object of the present invention is to provide a solenoid capable of sufficiently securing the flow passage area of the passage and thus improving the performance.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, a movable plunger is reciprocally inserted into the hollow inside of a hollow cylindrical solenoid body, and the movable plunger is moved by utilizing the magnetic attraction force of the solenoid body. A solenoid for driving a plunger, the solenoid having a flow passage between the outer circumference of the movable plunger and the inner circumference of the cylindrical solenoid body, the passage allowing fluid to flow on both end surfaces of the movable plunger, A hole is provided at one end surface of the movable plunger, and a guide member for guiding reciprocating movement of the movable plunger is provided at a peripheral surface of the hole.

[0010]

[Action]

 In the solenoid having the above structure, the movable plunger has a hole in its one end surface, and the guide member provided in the peripheral surface of the hole guides the reciprocating movement of the plunger, thereby eliminating the rattling of the plunger. Further, since it is not necessary to provide the guide member inside the flow path provided on the outer circumference of the plunger, the flow path area can be sufficiently secured.

[0011]

【Example】

 The present invention will be described below based on the illustrated embodiment. 1 to 5 showing a solenoid according to an embodiment of the present invention, reference numeral 1 denotes the entire solenoid body applied to the same solenoid valve shown in FIG. 6 (a) of the prior art. A core 2, a bobbin 4 for winding a coil 3 arranged so as to surround the core 2, and a movable plunger 5 reciprocally inserted into the hollow inside of the bobbin 4 are provided. The coil 3 is housed in a hollow case 6 provided integrally with the core 2, and the magnetic attraction of the solenoid body 1 is used to drive the plunger 5 back and forth. A flow path 8 is provided between the outer circumference of the plunger 5 and the inner circumference of the bobbin 4 to allow the fluid to flow on both end surfaces of the plunger 5.

The case 6 is made of a magnetic material, has a substantially U shape, and a core 2 protruding vertically in the axial direction is provided integrally with the case 6 at a substantially central portion of the bottom surface. A resin-made rectangular bobbin 4 is provided in the case 6 so as to surround the core 2, and the coil 3 is wound around the bobbin 4.

Further, the inner peripheral surface of the bobbin 4 is notched so as to provide several ribs 7 from the position flush with the end surface of the core 2 on the plunger 5 side to the end portion on the opening side. Then, the plunger 5 is reciprocally inserted into the inner peripheral surface of the rib 7 while maintaining the clearance in the prior art, and the space between the outer periphery of the plunger 5 and the inner periphery of the notched portion of the bobbin 4 is inserted. A flow path 8 is formed to allow the fluid to flow on both end surfaces of the plunger 5.

The movable plunger 5 is made of a magnetic material and has a cylindrical shape. A cylindrical hole 51 having a depth up to a midway portion is provided at the center of the outer end surface of the plunger 5.

An annular upper plate 9 that guides a magnetic path from the case 6 to the plunger 5 is provided on the upper portion of the coil 3, and the upper plate 9 is cut at a position corresponding to the flow path 8 on the inner periphery thereof. A notch 91 is provided. A stopper plate 10 provided on the upper plate 9 for restricting the movement of the plunger 5 in the axial direction is also provided.

The stopper plate 10 is made of a non-magnetic material and has a disk shape reaching the inner peripheral surface of the case 6, and a cylindrical hole 51 formed in the outer end surface of the plunger 5 is supported at the center thereof. A cylindrical projection 11 having a bottomed cylindrical shape is provided, and the outer peripheral surface of the cylindrical projection 11 and the inner peripheral surface of the hole 51 of the plunger 5 are slidable. Therefore, the stopper plate 10 serves as a guide member for guiding the reciprocating movement of the plunger 5. The height of the cylindrical projection 11 is such that when the outer end surface of the plunger 5 abuts the end surface of the disk portion 10A of the stopper plate 10, the end surface of the cylindrical projection 11 of the stopper plate 10 and the hole of the plunger 5. The bottom of 51 does not come into contact with it. Further, a hole 12 is formed at a position corresponding to the flow path 8 on the outer periphery of the plunger 5 and the notch 91 of the upper plate 9. A cover plate 13 having the same shape as the stopper plate 10 is provided on the stopper plate 10.

The cover plate 13 is made of a magnetic material, and is provided with a cylindrical columnar protrusion 14 so as to come into contact with the entire inner surface of the cylindrical protrusion 11 of the stopper plate 10. Further, the cover plate 13 has a disc portion 13 A of the cover plate 13. A hole 15 having the same diameter is formed at the same position as the hole 12 formed in the stopper plate 10.

The upper plate 9, the stopper plate 10, and the cover plate 13 are fixed to the inner peripheral surface of the open end of the case 6 by caulking or the like.

In the solenoid valve to which the solenoid body 1 shown in FIG. 1 is applied, the plunger 5 forms a valve body, the core 2 forms a valve seat, and the core 2 forming a valve seat is opened. An input side flow path 16 is provided. Therefore, by exciting the coil 3, a closed loop magnetic path is formed from the case 6, the upper plate 9, the plunger 5 and the core 2, the plunger 5 is magnetically attracted to the core 2, and the plunger 5 is , The input side flow path 16 is closed, and hydraulic pressure or the like is held. At this time, in this embodiment, since the hole 51 is formed in the plunger 5 and the clearance between the upper plate 9 and the plunger 5 is large, the magnetic attraction force is reduced and the hydraulic pressure cannot be retained. By providing a cover plate 13 made of a magnetic material having the same shape as the stopper plate 10 and the holes 15 and the protrusions 14 at the same position on the plate 10 and increasing the magnetic attraction force, the hydraulic pressure can be reliably retained. I did it.

On the other hand, when the coil 3 is de-energized, the magnetic attraction force between the plunger 5 and the core 2 disappears and the pressure of the fluid from the input side flow passage 16 pushes the plunger 5 to open the input side flow passage 16. The light is output to the outside through the notch 91 of the upper plate 9, the hole 12 of the stopper plate 10 and the hole 15 of the cover plate 13 through the flow path 8 on the outer peripheral side of the plunger 5.

In the solenoid having the above-mentioned configuration, the cylindrical protrusion of the stopper plate 10 made of a non-magnetic material that is slidable is provided on the inner peripheral surface of the cylindrical hole 51 provided on the outer end surface of the movable plunger 5. Since the guide 11 guides the forward and backward movement of the plunger 5 by utilizing the magnetic attraction force of the solenoid body 1, the radial backlash of the plunger 5 is eliminated.

Further, since the guide member is provided inside the plunger 5 as described above, there is no need to worry about the clearance between the inner peripheral surface of the bobbin 4 and the outer peripheral surface of the plunger 5 as in the conventional technique. Since it is not necessary to further provide the ribs 7, the flow passage 8 can be provided all around the outer peripheral side of the plunger 5, so that the flow passage area can be sufficiently secured and the performance can be improved. ..

In the above embodiment, a cylindrical hole 51 is provided on the outer end surface of the plunger 5, and the cylindrical projection 11 of the stopper plate 10 is provided as a guide member on the inner peripheral surface of the hole 51. As described above, the shape of the hole and guide member provided in the plunger is not limited to the above shape, as long as the guide member is formed in the hole provided in the plunger to guide the reciprocating movement of the plunger. , Other shapes are also acceptable.

[0024]

[Effect of the device]

 The present invention having the above-described configuration and operation has a hole formed in one end surface of a movable plunger, and a guide member for guiding the reciprocating movement of the plunger is provided on the peripheral surface of the hole. Since there is no rattling and it is not necessary to provide a guide member in the flow path provided on the outer periphery of the plunger, a sufficient flow path area can be secured and performance can be improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a solenoid valve to which a solenoid according to an embodiment of the present invention is applied.

2 is a perspective view showing a bobbin of the solenoid of FIG. 1. FIG.

3 (a) is a longitudinal sectional view showing an upper plate of the solenoid of FIG. 1, and FIG. 3 (b) is a side view of FIG. 3 (a).

4 (a) is a vertical sectional view showing a stopper plate of the solenoid of FIG. 1, and FIG. 4 (b) is a side view of FIG. 4 (a).

5 (a) is a vertical sectional view showing a cover plate of the solenoid of FIG. 1, and FIG. 5 (b) is a side view of FIG. 5 (a).

FIG. 6 (a) is a longitudinal sectional view of a main part of a solenoid valve to which a conventional solenoid is applied, and FIG. 6 (b) is the same figure (a).
3 is a perspective view showing a bobbin of the solenoid of FIG.

7 (a) is a vertical sectional view of an upper plate of the solenoid of FIG. 6 (a), and FIG. 7 (b) is a side view of FIG. 7 (a).

8 (a) is a vertical sectional view of the stopper plate of the solenoid of FIG. 6 (a), and FIG. 8 (b) is a side view of FIG. 8 (a).

[Explanation of symbols]

 1 Solenoid Main Body 2 Core 3 Coil 4 Bobbin 5 Plunger 51 Hole 6 Case 7 Rib 8 Flow Path 9 Upper Plate 91 Notch 10 Stopper Plate 10A Disc Part 11 Cylindrical Protrusion 12, 15 Hole 13 Cover Plate 13A Disc Part 14 Yen Columnar projection 16 Input side flow path

Claims (1)

[Scope of utility model registration request] 1. A movable plunger is reciprocally inserted into the hollow inside of a hollow cylindrical solenoid body, and the movable plunger is driven by utilizing the magnetic attraction force of the solenoid body. A solenoid having a flow passage between the outer circumference of the plunger and the inner circumference of the cylindrical solenoid body that allows fluid to flow on both end surfaces of the movable plunger, wherein a hole is provided in one end surface of the movable plunger. And a guide member for guiding the reciprocating movement of the movable plunger is provided on the peripheral surface of the hole.