JPH0671982U - solenoid - Google Patents

Abstract

(57) [Summary] [Purpose] To further reduce vibration transmission noise. [Structure] Between the fixed member 5 and the magnetic path forming member 8, there is provided a buffer means 20 for absorbing a shock when the movable member 7 collides with the fixed member 5. The fluid viscous damper is characterized in that a fluid 16 is enclosed in a space 15 formed between the passage forming means 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid used for, for example, a solenoid valve.

[0002]

[Prior art]

 As a conventional solenoid of this type, there is one as shown in FIGS. That is, the solenoid 100 is applied to a solenoid valve.

The solenoid 100 includes a center post 101 as a fixing member made of a magnetic material, a coil 102 arranged so as to surround the center post 101, and a coil 102 arranged coaxially with the center post 101. And a plunger 103 as a movable member that is housed in a cover plate 104 as a magnetic path forming member that forms a magnetic path between the center post 101 and the plunger 103. By energizing the coil 102, the plunger 103 is magnetically attracted to the center post 101.

A through hole 105 is formed coaxially with the center post 101 at a position where the plunger 103 of the center post 101 of the cover plate 104 faces the end face 101A opposite to the end face for magnetic attraction. The protrusion 101B protruding from the end surface 101A of the center post 101 is inserted into the through hole 105, and the center post 101 is fixed by caulking the protrusion 101B.

Then, the solenoid 100 configured as described above is mounted on the mating mounting surface (for example, the vehicle body side) in use.

[0006]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional technique, when the coil 103 is energized, the plunger 103 is actuated and a shock (vibration) is generated when the plunger 103 collides with the center post 101 by magnetic attraction. This vibration is transmitted from the caulking portion 106 where the protrusion 101B of the center post 101 is crimped to the mating mounting surface (vehicle body side) via the case 104, and an uncomfortable sound is transmitted to the outside (inside the vehicle) as a vibration transmission sound. There was a flaw to convey.

Therefore, as a countermeasure against the above-described drawback, a rubber mount 108 is arranged between the solenoid 100 and the mating mounting surface 107 as shown in FIG. However, it is not perfect, and recently, further reduction of vibration transmission noise is required.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object thereof is to provide a solenoid capable of further reducing the vibration transmission sound. .

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a fixed member made of a magnetic material, a movable member made of a magnetic material arranged coaxially with the fixing member, and a fixed member are arranged so as to surround the fixed member. A solenoid that has a coil to be placed and a magnetic path forming member that forms a magnetic path between the fixed member and the movable member, and energizes the coil to magnetically attract the movable member to the fixed member. A buffer means is provided between the member and the magnetic path forming member to absorb an impact when the movable member collides with the fixed member, and the buffer means is a space formed between the fixed member and the magnetic path forming member. It is characterized by being a fluid viscosity damper in which a fluid is enclosed.

[0010]

[Action]

 In the solenoid having the above structure, a cushioning means is provided for absorbing a shock when a movable member, which is a fluid viscous damper in which a fluid is sealed in a gap formed between the fixed member and the magnetic path forming member, collides with the fixed member. Since it is provided, the vibration transmission path in the collision when the movable member is magnetically attracted to the fixed member is the fixed member → the flow path → the magnetic path forming member, and the vibration is largely damped in the fluid portion. Therefore, the vibration transmission sound can be further reduced as compared with the conventional technique.

[0011]

【Example】

 The present invention will be described below based on the illustrated embodiment. In FIG. 1 showing a solenoid according to an embodiment of the present invention, reference numeral 1 denotes a solenoid main body applied to a solenoid valve A. By operating this solenoid 1, the solenoid 1 is integrally assembled with the solenoid 1. The flow path 4 opening in the valve seat 3 of the valve body 2 is opened and closed.

The solenoid 1 is roughly configured as follows: a center post 5 as a fixing member made of a magnetic material, a coil 6 arranged so as to surround the center post 5, and a coil 6 inside the coil 6 and coaxial with the center post 5. 7, a plunger 7 as a movable member that is disposed in a fixed manner, a cover plate 8 as a magnetic path forming member that houses these members 5, 6, 7 and forms a magnetic path between the center post 5 and the plunger 7. It is composed of a cushioning means 20 for absorbing a shock when the plunger 7 collides with the center post 5.

The coil 6 is wound around a resin bobbin 9 having outward flange portions 91 and 92 extending outward in the radial direction at both ends. The center post 5 is inserted into one opening of the bobbin 9, and the plunger 7 is inserted into the other opening of the bobbin 9 so as to be movable back and forth coaxially with the center post 5.

The center post 5 has a substantially columnar shape, and the end of the plunger 7 opposite to the magnetic attraction surface 51 on which the plunger 7 is magnetically attracted is stepped. This stepped shape has a smaller diameter than the center post 5 on the central axis from the large diameter flange portion 52 that projects radially outward from the outer peripheral surface of the center post 5 and the opposite end surface 53 on the opposite side of the magnetic attraction surface 51. And a projecting portion 54.

The center post 5 is held on the inner circumference of the bobbin 9 by closely contacting the outer peripheral surface and the inner end surface of the flange portion 52 of the center post 5 with the step portion 93 provided at one open end of the bobbin 9. ing.

On the other hand, the plunger 7 is reciprocally inserted into the other opening of the bobbin 9 via a bearing 10, and both the plunger 7 and the bearing 10 are partly outside the bobbin 9 in the axial direction. . A lower plate 11 for guiding the magnetic path from the cover plate 8 to the plunger 7 is provided below the outward flange portion 92 of the bobbin 9 around which the coil 6 is wound around the protruding portion.

Further, the plunger 7 is in the shape of a cylinder with a bottom, the opening is on the side of the center post 5, and a spring 12 is provided inside thereof. One end of the spring 12 is in contact with the magnetic attraction surface 51 of the center post 5 and the other end is in contact with the bottom surface of the spring 12, and the spring 12 is urged toward the valve seat 3 facing the plunger 7.

Each of the members configured as described above is made of a magnetic material through the mold resin portion 13 that is entirely covered with the lower plate 11 side and the opposite end surface 53 of the center post 5 exposed. It is covered by the cover plate 8. Further, the valve plate 2 is integrally assembled by the cover plate 8 so that the valve seat 3 is coaxial with the center post 5 and the plunger 7.

Further, on the end surface 53 side of the cover plate 8 opposite to the center post 5, a recess 81 into which the protrusion 54 of the center post 7 is inserted is formed. In the center post 7, the protrusion 54 of the center post 5 is inserted into the recess 81, and is fixed between the outer peripheral surface of the center post 7 and the outside of the flange 52 and the inner end surface of the cover plate 8 via the O-ring 14. Has been done. At this time, a gap 15 is formed between the O-ring 14 and the opposite end surface 53 of the center post 7, the end surface and the outer peripheral surface of the protruding portion 54, the end surface of the cover plate 8 facing these surfaces, and the O-ring 14. The gap 15 is provided according to the size of the end surface of the mode resin portion 13 that contacts the end surface of the cover plate 8 on the opposite side of the valve body 2. Then, the magnetic fluid 16 as a fluid is enclosed in the void 15 to form the buffer means 20 which is a fluid viscosity damper.

Next, the operation of the solenoid 1 will be described. In this solenoid 1, a closed loop magnetic path is formed from the center post 5, the cover plate 8, the lower plate 11, and the plunger 7 by energizing the coil 6 so that the plunger 7 resists the spring force of the spring 12 and the center post 5 is pressed. It is magnetically attracted to the side and magnetically attracted to the magnetic attraction surface 51 of the center post 5. At this time, the plunger 7 is separated from the valve seat 3 of the valve body 2, and the flow path 4 opened in the valve seat 3 is opened.

When the coil 6 is de-energized, the spring force of the spring 12 causes the plunger 7 to separate from the magnetic attraction surface 51 of the center post 5. At this time, the plunger 7 contacts the valve seat 3 of the valve body 2 and closes the flow path 4.

In the solenoid having the above-described structure, since the magnetic fluid 16 is a fluid viscous damper in which the magnetic fluid 16 is present in the gap 15 between the opposite end face 53 side of the center post 5 and the cover plate 8, the plunger 7 is the center. When colliding with the post 5 due to magnetic attraction, vibration is generated, but the transmission path of this vibration changes from the conventional center post 7 → cover plate 8 to center post 7 → magnetic fluid 16 → cover plate 8 and the vibration is generated. The magnetic fluid is greatly attenuated by 16 parts. Therefore, when the solenoid having the above structure is attached to the mating mounting surface 107 as shown in FIG. 2B shown in the related art, the transmission of vibration to the mating mounting surface 107 is reduced as compared with the prior art. Therefore, the vibration transmission sound can be further reduced.

Further, since the fluid in the void 15 is the magnetic fluid 16, it is possible to suppress magnetic loss, and it is possible to prevent a decrease in magnetic attraction force.

Although the magnetic fluid 16 is used as the fluid to be sealed in the void 15 in the above embodiment, this is because the magnetic loss is taken into consideration, and the fluid is not limited to the magnetic fluid. It is possible to reduce the vibration transmission noise even with fluid such as oil.

[0025]

[Effect of device]

 The present invention has the above-described configuration and operation, and is designed to prevent impact when a movable member, which is a fluid viscous damper in which a fluid is enclosed in a gap formed between a fixed member and a magnetic path forming member, collides with the fixed member. Since a cushioning means is provided to absorb the vibration, the vibration transmission path in the collision when the movable member is magnetically attracted to the fixed member is fixed member → flow path → magnetic path forming member, and the vibration is greatly damped in the fluid part. Will be done. Therefore, the vibration transmission sound can be further reduced as compared with the conventional technique.

[Submission date] January 21, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007] Therefore, as a countermeasure for the drawbacks, 2 to the center Posuto side of the mounting and the plunger 7 of the rubber mount 108 cushioning material between the solenoid 100 and the mating mounting surface 107 as shown in (a) of the (rubber) Although measures have been taken to reduce the vibration transmission sound due to mounting , it is not perfect, and recently, further reduction of the vibration transmission sound is required.

[Brief description of drawings]

FIG. 1 (a) is a vertical cross-sectional view of a solenoid valve to which a solenoid according to an embodiment of the present invention is applied, and FIG. 1 (b) is an enlarged view of part B of FIG. 1 (a).

FIG. 2 (a) is a front view of a solenoid valve to which a conventional solenoid is applied, and FIG. 2 (b) is the same figure (a).
FIG. 6 is a top view showing a state where the solenoid valve of FIG.

3 (a) is a sectional view taken along line CC of FIG. 2 (a), and FIG. 3 (b) is an enlarged view of a portion D of FIG. 3 (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solenoid 2 Valve body 3 Valve seat 4 Flow path 5 Center post (fixed member) 51 Magnetic attraction surface 52 Flange portion 53 Opposite end surface 54 Projection portion 6 Coil 7 Plunger (movable member) 8 Cover plate (magnetic path forming member) 81 Recessed portion 9 Bobbin 91, 92 Outward flange portion 93 Stepped portion 10 Bearing 11 Lower plate 12 Spring 13 Mold resin portion 14 O-ring 15 Gap 16 Magnetic fluid (fluid) 20 Buffering means

Claims (1)

[Scope of utility model registration request] 1. A fixed member made of a magnetic material, a movable member made of a magnetic material arranged coaxially with the fixed member, a coil arranged so as to surround the fixed member, and between the fixed member and the movable member. A magnetic path forming member that forms a magnetic path of the magnetic path forming member, wherein the movable member is magnetically attracted to the fixed member by energizing the coil, the movable member is movable between the fixed member and the magnetic path forming member. A shock-absorbing means is provided for absorbing a shock when the member collides with the fixed member, and the shock-absorbing means is a fluid viscosity damper in which a fluid is enclosed in a space formed between the fixed member and the magnetic path forming member. And solenoid.