JPH0614652U - solenoid - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the manufacturability of parts and the performance. [Structure] The bearing 5 is formed by at least three pillars 51, and a flow path 9 for allowing a fluid to flow through a gap between the pillars 51.
It is characterized by

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid used in, for example, a solenoid valve, and more particularly to a solenoid in which a flow path must be secured between the outer circumference of a magnetic movable member and a bearing.

[0002]

[Prior art]

 As a conventional solenoid of this type, there is, for example, one shown in FIGS. 5 and 6. That is, reference numeral 100 denotes the entire solenoid applied to the solenoid valve. This solenoid 100 is wound around a magnetic fixing member 101 and a resin bobbin 102 arranged so as to surround the fixing member 101. The coil 103 and the plunger 105 as a movable member made of a magnetic material are reciprocally inserted into the hollow inside of the bobbin 102 via a bearing 104. The coil 103 wound around the bobbin 102 is housed in a case 106 having a hollow inside. Further, one end of the case 106 is integrated with the fixing member 101, and the other end of the case 106 is provided with a stopper 107 that regulates the movement of the plunger 105 in the axial direction and closes the opening.

Then, by energizing the coil 103, a magnetic flux of a closed loop is formed from the case 106, the plunger 105, and the fixing member 101, and the plunger 105 is reciprocally driven by utilizing a magnetic attraction force. ing.

Then, in order to secure a flow path 108 between the outer circumference of the plunger 105 and the inner circumference of the bobbin 102, which allows the fluid to flow on both end surfaces of the plunger 105, as shown in FIG. There are cases where a pair of slits 109 are provided on the outer circumference of the plunger 105 and cases where two pairs of slits 110 are provided on the inner circumference of the bearing 104 as shown in FIG. 7.

[0005]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional technique, it is necessary to process the slits 109 and 110 in the plunger 105 or the bearing 104, which complicates the shape of the parts, and thus there is a problem that manufacturability is poor.

Further, when the slits 109 are provided in the plunger 105, the magnetic path of the plunger 105 becomes narrower, so that the attraction force becomes smaller and the performance deteriorates.

Further, when the bearing 104 is formed by resin molding, the inner diameter of the bearing 104 changes via the bobbin 102 due to the pressure and the thermal expansion of the coil 103 wound around the bobbin 102 at a high temperature. Since the value of S is large, there is a problem that the play of the plunger 105 becomes large and the performance deteriorates.

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 provide a solenoid capable of improving the manufacturability of parts and the performance thereof. To do.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a fixing member made of a magnetic material, a coil wound around a bobbin arranged so as to surround the fixing member, and the fixing member coaxial with the fixing member are provided. A movable member made of a magnetic material that is reciprocally inserted via a bearing into the hollow inside of the bobbin, and energizes the coil to magnetically attract the movable member to the fixed member. It is characterized in that the bearing is formed by at least three pillars, and the gap between the pillars is a flow passage that allows fluid to flow.

[0010]

[Action]

 In the solenoid having the above structure, the bearing is formed by at least three pillars, and the gap between the pillars is formed as a flow passage that allows the passage of fluid, so that the flow passage is formed as in the prior art. Since it is no longer necessary to provide slits on the outer circumference of the movable member or the inner circumference of the bearing to secure it, the shape of the component can be simplified.

Further, since the bearing is formed of at least three columns, the contact with the outer periphery of the movable member becomes a line contact, and the line contact causes a contact between the movable member and the bobbin at a high temperature due to the pressure of winding the coil. Since the deformation of the bobbin is released, there is no change in the inner diameter of the bearing. Therefore, it is not necessary to make a large gap between the bearing and the movable member as in the prior art, so that there is no rattling of the movable member and the performance is improved.

Further, since the flow passage is secured between the columns of the bearing, it is not necessary to provide the flow passage on the outer periphery of the movable member as in the conventional technique. Therefore, the magnetic path of the movable member does not become narrow when the coil is energized, and the magnetic attraction force to the fixed member does not become small, so the performance is improved.

[0013]

【Example】

 The present invention will be described below based on the illustrated embodiment. 1 to 3 showing a solenoid according to an embodiment of the present invention, reference numeral 1 denotes the entire solenoid applied to a solenoid valve, and generally, a core 2 as a fixing member made of a magnetic material, and a core. A coil 4 wound around a bobbin 3 arranged so as to surround 2 and a plunger 6 as a movable member made of a magnetic material, which is reciprocally inserted into a hollow inside of the bobbin 3 via a bearing 5. I have it. The coil 4 wound around the bobbin 3 is housed in an inner hollow case 7 that is integrally provided with the core 2. The plunger 6 is secured by utilizing the electromagnetic attraction force generated by energizing the coil 4. It is designed to reciprocate.

The case 7 is made of a magnetic material, has a substantially U-shaped cross section, and a core 2 that projects upward in the axial direction in FIG. . A bobbin 3 is provided in the case 7 so as to surround the core 2. The bobbin 3 is cylindrical and has outward flange portions 31 at both ends, and is made of resin. The coil 4 is wound around the bobbin 3.

The open end of the case 7 is in contact with the end face of the outward flange 31 of the bobbin 3 and projects radially inward to the inner peripheral surface of the bobbin 3. The diameter is almost the same as the inner diameter of the bobbin 3.

A plunger 6 is inserted into the inside of the bobbin 3 and the protruding portion 71 of the case 7 via a bearing 5 so as to be coaxial with the core 2 and reciprocally movable. The plunger 6 has a cylindrical shape. On the other hand, in the bearing 5, as shown in FIG. 2, four cylindrical pins 51 as pillars are provided on the outer periphery of the plunger 6 in equal distribution. As shown in FIG. 3, both ends of the pin 51 are tapered, and the tapered portion 52 at one end of the pin 51 is located between the outer peripheral surface of the plunger 6 and the inner peripheral surface of the protruding portion 71 of the bobbin 3 and the case 7. The tapered portion 52 at the other end of the pin 51, which is embedded in the core 2, regulates the axial movement of the plunger 6 and is fixed to the stopper 8 that closes the opening of the case 7. It is incorporated in the solenoid 1.

The gaps between the pins 51 form the flow passages 9 that allow the fluid to flow on both end surfaces of the plunger 6.

When the solenoid 1 is applied to a solenoid valve as shown in FIG. 1, the plunger 6 forms a valve body, the core 2 forms a valve seat, and the core 2 forms a valve seat. An input side flow path 10 having an opening is provided. Therefore, by passing a current through the coil 4, a closed loop magnetic path is formed from the outer peripheral portion 72 of the case 7, the protruding portion 71 of the case 7, the plunger 6, and the core 2, and the end face of the plunger 6 is the end face of the core 2. Is magnetically attracted to. The magnetic attraction force causes the end face of the plunger 6 to contact the end face of the coil 2 to close the input side flow passage 10 and hold hydraulic pressure and the like.

On the other hand, when the coil 4 is not energized, the magnetic attraction force between the plunger 6 and the core 2 is lost, and the plunger 6 is pushed by the pressure of the fluid from the input side flow passage 10, and the input side flow passage 10 Is opened. As a result, the fluid flows to the outside through the input side flow passage 10, the flow passage 9 in the gap between the pins 51, and the hole 81 provided in the stopper 8.

In the solenoid having the above-described configuration, the bearing 5 is formed by the four pins 51, and the gap between the pins 51 is formed as the flow passage 9 that allows the fluid to flow. It is not necessary to provide a slit in the plunger 6 to secure the flow path as described above, and the shape of the plunger 6 can be a simple cylinder. Moreover, since the bearing 5 is also formed by the pin 51, the shape of the component can be simplified and the manufacturability can be facilitated.

Further, since the bearing 5 is formed by the four pins 51, the contact with the outer periphery of the plunger 6 becomes a line contact, and the bobbin is formed by the gap between the line contacts, that is, the gap between the pins 51. The deformation of the bobbin 3 due to the pressure of winding the coil 4 around the coil 3 at high temperature is released as shown by the dotted line in FIG. 2 (b), so that the inner diameter of the bearing 5 does not change. Therefore, unlike the prior art, it is not necessary to allow a large gap between the bearing 5 and the plunger 6 in consideration of the amount of deformation, so that the rattling of the plunger 6 is eliminated and the performance can be improved.

Further, since the plunger 6 does not need to be provided with the slit for securing the flow path 9 as described above, the magnetic path of the plunger 6 when the coil 4 is energized is not narrowed, Since the magnetic attraction force to the core 2 does not become small, the performance can be improved.

In the above embodiment, the pin 51 is used as the pillar for forming the bearing 5, but the plate 53 may be formed as shown in FIG. Further, the bearing 5 may be formed of resin at the same time as the molding of the bobbin 3, instead of incorporating the four pins 51 in the core 2 and the stopper 8. Further, the bearing 5 has been described by taking the example in which the four pins 51 are provided at equal intervals, but the number of the pins 51 may be three or five instead of four, and the point is to have three or more. . The positions where the pins 51 are provided are not limited to equidistant arrangement, and may be provided at positions where the plunger 6 is supported without play.

[0024]

[Effect of device]

 According to the present invention, which has the above-described configuration and operation, the bearing is formed by at least three columns, and the gap between the columns is a flow passage that allows fluid to flow. It is not necessary to provide a slit on the outer periphery of the movable member to secure the flow passage. In addition, since the bearing is also formed of a pillar, the shape of the component can be simplified and the manufacturability of the component can be improved.

Further, since the bearing is formed by at least three columns, the contact with the outer periphery of the movable member becomes a line contact, and the coil is attached to the bobbin between the line contacts, that is, the gaps between the columns. Deformation of the bobbin at high temperature due to the winding pressure is released, so there is no change in the inner diameter of the bearing. Therefore, unlike the prior art, it is not necessary to make a large gap between the bearing and the movable member in consideration of the amount of deformation, so that there is no backlash of the movable member and the performance can be improved.

Further, since the movable member does not need to have the slit for securing the flow path as described above, the magnetic path of the movable member does not become narrow when the coil is energized, and the fixed member is eliminated. Since the magnetic attraction force to the magnet does not decrease, the performance can be improved.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view of a solenoid valve to which a solenoid according to an embodiment of the present invention is applied.

2 (a) is a longitudinal sectional view of a main part showing a bearing portion of FIG. 1, and FIG. 2 (b) is a top view of FIG. 2 (a).

FIG. 3 is a front view of a pin for forming a bearing.

FIG. 4 shows a plate as another aspect of the pillar for forming the bearing, and is a view corresponding to FIG. 2 (b).

FIG. 5 is an overall vertical sectional view of a solenoid valve to which a conventional solenoid is applied.

6 (a) is a longitudinal cross-sectional view of a main part showing the bearing portion of FIG. 5, and FIG. 6 (b) is a top view of FIG. 6 (a).

FIG. 7 (a) is a longitudinal cross-sectional view of a main part showing a bearing portion of another conventional solenoid, and FIG. 7 (b) is the same figure (a).
FIG.

[Explanation of symbols]

 1 Solenoid 2 Core (fixing member) 3 Bobbin 31 Outward flange part 4 Coil 5 Bearing 51 Pin (pillar) 52 Tapered part 53 Plate (pillar) 6 Plunger (movable member) 7 Case 71 Projection 72 Perimeter 8 Stopper 81 Hole 9 Flow path 10 Input side flow path

Claims (1)

[Scope of utility model registration request] 1. A fixing member made of a magnetic material, and a coil wound around a bobbin arranged so as to surround the fixing member,
A movable member made of a magnetic material, which is coaxial with the fixed member and is reciprocally inserted into the hollow inside of the bobbin via a bearing,
A solenoid for magnetically attracting the movable member to the fixed member by energizing the coil, the bearing is formed by at least three columns, and a fluid is allowed to flow through a gap between the columns. A solenoid characterized by being used as a flow path.