JPH08200534A - Solenoid - Google Patents

Abstract

PURPOSE: To reduce operating sound and vibration that are caused when a movable member collides with an axial-direction regulating member during magnetic attraction by providing, in a portion of the movable member along its axis, a taper portion whose diameter decreases from one magnetic-path forming portion to the other magnetic-path forming portion. CONSTITUTION: A portion of a plunger 4 along its axis is formed into a taper portion 42 whose diameter decreases from an upper plate 5 to a lower plate 6, so that as a plunger-A portion 26 approaches a magnetic path-A portion 24, the distance between the guide hole of a magnetic path-B portion 25 and the taper portion 42 of the plunger 4 increases, decreasing magnetic flux II 31 between them. Also, magnetic flux III 32 is produced between the magnetic path-B portion 25 and a plunger-B portion 27, and the magnetic flux of the magnetic path-B portion 25 and the plunger 4 is dispersed. When the plunger-B portion 27 is passing through the magnetic path-B portion 25 with further movement, the force of attraction toward the magnetic path-B portion 25 works between the plunger-B portion 27 and the magnetic path-B portion 25 due to the magnetic flux III 32. These actions restrain the force of attraction toward a first regulating member at the end of the current-carrying state of a coil 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid used as an electromagnetic actuator, for example.

[0002]

2. Description of the Related Art A conventional solenoid of this type is shown in FIG.

That is, the solenoid 100 has a through hole 102 which is housed in a case 101 and penetrates in the axial direction.
And a case 100 provided at both ends of the coil 103 in the axial direction, which form a magnetic path, and form a magnetic path. The upper plate 104 has holes 104A and 105A (the coil 103 in the figure). Left side) and lower plate 105 (right side of coil 103 in the figure), through hole 102 of coil 103 and upper plate 104, holes 104A and 105A of lower plate 105.
A plunger 107 as a movable member made of a magnetic material that is reciprocally inserted into a guide hole 106 formed by and a first regulation on the upper plate 104 side as a regulation member that regulates the axial movement of the plunger 107. The second regulating member 109 on the side of the member 108 and the lower plate 105, and the first regulating member 109
A spring 110 is provided between the regulating member 108 and the plunger 107 and serves as a pressing unit that presses the plunger 107 toward the second regulating member 109.

Then, by applying an electric current to the coil 103, the case 101 and the upper plate 104
A magnetic path is formed by the (magnetic path A portion 111), the plunger 107, and the lower plate 105 (magnetic path B portion 112). The plunger 107 is magnetically attracted to the upper plate 105 side against the pressing force of the spring 110, The axial movement is restricted by the first restriction member 108.

[0005]

In the case of the above-mentioned prior art, as shown in FIG. 4 (a), the coil 10 is used.
When a current is applied to 3, the plunger 107 causes the magnetic path A portion 1
The magnetic flux I113 between 11 and the end of the plunger 107 is attracted to the magnetic path A portion 111 side (left direction in the drawing).

However, since the outer peripheral surface of the plunger 107 is a uniform surface from one end to the other end in the axial direction, the magnetic path B portion 11
Since the distance between the inner peripheral surface of the hole 105A of the lower plate 105 and the outer peripheral surface of the plunger 107 forming the same 2 (see FIG. 4 (b)), the attractive force is the end of the magnetic path A portion 111 and the plunger 107. The distance becomes larger as the distance between the ends becomes smaller, and becomes maximum at the end of energization of the coil 103.

Therefore, there is a problem that impact noise (operation noise) and vibration are generated when the first regulating member 108 and the plunger 107 collide.

The present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to occur when the movable member collides with its axial direction regulating member during magnetic attraction of the movable member. An object of the present invention is to provide a solenoid that can reduce operating noise and vibration.

[0009]

In order to achieve the above object, in the present invention, a solenoid body having a guide hole therein and a magnetic body reciprocally inserted into the guide hole of the solenoid body. Made of a movable member, a magnetic path forming portion which is located at both ends of the movable member in the axial direction and which is provided on the outer periphery of the guide hole and forms a magnetic path with the movable member, and an axial direction of the movable member. A restricting member for restricting movement is provided, and by energizing the solenoid body, the movable member is magnetically attracted to the one magnetic path forming portion side, and the restricting member regulates the movement of the movable member in the axial direction. In the solenoid, a taper portion having a reduced diameter from the one magnetic path forming portion side to the other magnetic path forming portion side is provided in an axially intermediate portion of the movable member.

[0010]

In the solenoid having the above-described structure, the axially intermediate portion of the movable member is provided with the taper portion whose diameter is reduced from one magnetic path forming portion side toward the other magnetic path forming portion side. ,
When the solenoid body moves to the one magnetic path forming portion side when energized, as one end of the movable member on the magnetic path forming portion side approaches the one magnetic path forming portion, the guide hole of the other magnetic path forming portion Since the distance between the side surface and the surface of the taper portion increases, the magnetic flux between them decreases.

Further, when the other end of the movable member on the side of the other magnetic path forming portion tries to pass the other magnetic path forming portion by moving, the distance between the end of the movable member and the other magnetic path forming portion is reduced. The magnetic flux between them causes an attractive force to act on the other magnetic path forming portion side.

By these actions, it is possible to suppress the attraction force to one magnetic path forming portion side at the end of energization of the solenoid body. As a result, it is possible to reduce operating noise and vibration at the time of collision between the movable member and the axial direction regulating member of the movable member.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1 showing a solenoid according to an embodiment of the present invention, reference numeral 1 denotes the entire solenoid, and generally, a solenoid main body 3 having a guide hole 2 inside and a guide hole 2 are shown.
And a plunger 4 as a movable member made of a magnetic material that is reciprocally inserted into the guide hole 2. The plunger 4 is located at both axial ends of the plunger 4 and is provided on the outer circumference of the guide hole 2 to form a magnetic path together with the plunger 4. Upper plate 5 (left side in the figure) and lower plate 6 (right side in the figure) forming a magnetic path forming part
And a first regulation member 7 (upper plate 5 side) and a second regulation member 8 (lower plate 6 side) that regulate the movement of the plunger 4 in the axial direction.

The solenoid body 3 has a case 9 which is open at both ends, and a first case which is attached to both end faces of the case 9, respectively.
It has a cap 10 (left side in the drawing) and a second cap 11 (right side in the drawing). The first cap 10 and the second cap 11 are half-section L-shaped members that have holes 10A and 11A on the same axis and also have flange portions 10B and 11B that face outward in the radial direction, and their convex portions 10C and 11C. With the flange portion 10 on the open end face of the case 9 with the axial direction facing outward.
B and 11B are arranged in contact with each other.

The hole 10 is formed in the first cap 10.
A first sleeve 12 having a L-shaped half-section is attached so as to abut the inner peripheral surface of A and the end surface of the flange portion 10B. On the other hand, in the second cap 11, so as to contact the inner peripheral surface of the hole 11A,
A second sleeve 13 having the same diameter as the inner diameter of the first sleeve 12 is attached coaxially with the first sleeve 12. This second
The end surface of the sleeve 13 on the case 9 side and the end surface of the flange portion 11A of the second cap 11 on the case 9 side are substantially flush with each other.

As described above, the inner diameters of the first and second sleeves 12 and 13 are within the space formed by the case 9, the first and second caps 10 and 11, and the first and second sleeves 12 and 13. A coil 15 wound around a bobbin 14 which is almost the same as
The upper plate 5 and the lower plate 6, which have holes 51 and 61 having substantially the same diameter as the inner diameter of the bobbin 14 provided via the bobbin 14 at both ends of the coil 15, are housed. At this time, the upper plate 5 is arranged so as to abut the end surface of the flange portion 12A of the first sleeve 12, and the lower plate 6 is arranged so as to abut the end surface of the second sleeve 13 and the flange portion 11B of the second cap 11. Set up.

As described above, the coil 15, the upper plate 5, and the lower plate 6 wound around the bobbin 14 are housed, so that the first and second sleeves 11 and 12, the hole 51 of the upper plate 5, and the lower plate 6 are accommodated. Hole 61, bobbin 1
A guide hole 2 into which the plunger 4 is reciprocally inserted via a sleeve 16 is formed on the inner diameter side surface of the guide hole 4.

That is, the upper plate 5 and the lower plate 6 are located at both ends of the plunger 4 in the axial direction, and are provided substantially perpendicular to the axial direction of the plunger 4.

The sleeve 16 is provided from the first sleeve 12 to the second sleeve 13.

The plunger 4 has a through hole 41 on the central axis.
The rod 17 is inserted and fixed in the through hole 41. The rod 17 extends from both end surfaces of the plunger 4 to the outside of the solenoid body 3.

The outer diameters of both ends of the plunger 4 are substantially the same, and the axially intermediate portion between them is a tapered portion 42 whose diameter decreases from the upper plate 5 side toward the lower plate 6 side. Has become.

Then, first and second restricting members 7 and 8 for restricting the axial movement of the plunger 4 are fitted into the guide holes 2 at both ends of the sleeve 16, respectively. This first
The second restricting members 7 and 8 have a recessed cross section having holes 71 and 81 on the central axis through which the rod 17 can reciprocate.

The first and second regulating members 7 and 8 are arranged such that the openings of the respective recesses face each other, and the bottoms of the first and second regulating members 7 and 8 are the first closing member 18 (left side in the drawing) and the second closing member 19 (see the drawing). By making contact at the center right side), the end surfaces of the fitting portions 72, 82 come into contact with the end surface of the sleeve 16. Since the fitting portions 72 and 82 are thicker than the wall thickness of the sleeve 16, they are projected from the inner peripheral surface of the sleeve 16. As a result, when the plunger 4 moves back and forth,
Since the end surface of the contact part abuts on the end surfaces of the fitting parts 72 and 82, the movement in the axial direction is restricted.

The first and second closing members 18 and 19 are substantially plate-shaped, and the first and second closing members 18 and 19 corresponding to the radially outer sides of the holes 18A and 19A in which the rod 17 provided on the central axis can reciprocate. Two
Insertion holes 18B, 1 for inserting the sleeves 12, 13
Have 9B.

The first closing member 18 is positioned and fixed by inserting the first sleeve 12 into the insertion hole 18B and engaging with the recess 12B provided at a predetermined axial position of the first sleeve 12. The second blocking member 19 is positioned and fixed by inserting the second sleeve 13 into the insertion hole 19B and engaging with the recess 13A provided at a predetermined axial position of the second sleeve 13.

Thus, the first and second closing members 18, 19
The first and second regulating members 7 and 8 are positioned through the sleeve 16 by positioning and fixing the.

A spring 20 as a pressing means for pressing the plunger 4 toward the second restricting member 8 is interposed between the first restricting member 7 and the plunger 4. One end of the spring 20 abuts on a corner of the concave portion of the first regulating member 7, and the other end of the spring 20 contacts the outer peripheral surface of the rod 17 and the plunger 4.
Has a taper shape that abuts a corner with the end surface of the.

Reference numeral 21 in the drawing denotes a lead wire for applying a current to the coil 15, and this lead wire 21 is a pipe provided so as to penetrate the first cap 10, the first sleeve 12, and the upper plate 5. It is connected to the coil 15 via 22.

The solenoid 1 constructed as described above is
For example, they are attached in a pair of mating attachment portions 23 provided with a predetermined interval in the axial direction as shown in FIG.

In the solenoid 1, when the current is not applied to the coil 15, the plunger 4 is pressed toward the second regulating member 8 by the spring force of the spring 20, and the end face of the plunger 4 is the second regulating member 8. Fitting part 82
The movement on the right side in the axial direction is regulated by abutting against.

When a current is applied to the coil 15, the case 9, the lower plate 6, the plunger 4, and the upper plate 5 form a magnetic path. Thereby, the plunger 4
Is magnetically attracted to the upper plate 5 side against the spring force of the spring 20, and moves to the first regulating member 7 side,
When the end surface of the plunger 4 collides with the end surface of the fitting portion 72 of the first restriction member 7, the movement on the left side in the axial direction is restricted.

The energization of the coil 15 will be described in detail with reference to FIG.

When a current is applied to the coil 15, a magnetic path is formed by the case 9, the upper plate 5 (magnetic path A portion 24), the plunger 4, the lower plate 6 (magnetic path B portion 25), and The plunger 4 is magnetically attracted to the upper plate 5 (magnetic path A portion 24) side by the magnetic flux I30 between the path A portion 24 and the end portion of the plunger 4 (plunger A portion 26) (see FIG. 2A).

In the solenoid having the above construction, the plunger 4 has a shape in which the outer diameters of both end portions are substantially the same, and the axially intermediate portion between them extends from the upper plate 5 side to the lower plate 6 side. Since the taper portion 42 has a reduced diameter, when moving to the magnetic path A portion 24 side, as the plunger A portion 26 approaches the magnetic path A portion 24, the side surface of the guide hole 2 of the magnetic path B portion 25 ( Since the distance between the inner peripheral surface of the hole 61 of the lower plate 6 and the surface of the tapered portion 42 of the plunger 4 is large, the magnetic flux II31 therebetween is reduced. Further, the magnetic path B portion 25 and the end portion of the plunger 4 (plunger B portion 27)
A magnetic flux III 32 is generated between the magnetic flux and the magnetic field B portion 25 and the plunger 4 (see FIG. 2B).

Further, when the plunger B portion 27 moves past the magnetic path B portion 25 by moving, the distance between the plunger B portion 27 and the magnetic path B portion 25 becomes closer, and due to the magnetic flux III 32 between them. An attractive force acts on the magnetic path B portion 25 side (see FIG. 2).
(C)).

By these actions, it is possible to suppress the attraction force to the first regulating member 7 side at the end of energization of the coil 15. As a result, it is possible to reduce operating noise and vibration when the plunger 4 and the first restricting member 7 collide.

In the above embodiment, the outer diameters of both ends of the plunger 4 as the movable member are substantially the same. However, the outer diameters may not be the same, and the upper plate 5 forming one magnetic path forming portion may be used. It suffices that the end portion on the side of the lower plate 6 that forms the other magnetic path forming portion on the opposite side from is projected from the surface of the taper portion.

[0038]

In the solenoid having the above structure, the movable member is provided with a taper portion which is reduced in diameter from one magnetic path forming portion side toward the other magnetic path forming portion side in the axially intermediate portion. Therefore, when the solenoid body is moved to the one magnetic path forming portion side when energized, as one magnetic path forming portion side end of the movable member approaches the one magnetic path forming portion, the other magnetic path forming portion Since the distance between the side surface of the guide hole and the surface of the tapered portion is large, the magnetic flux between them is reduced.

Furthermore, when the other end of the movable member on the side of the other magnetic path forming section tries to pass the other magnetic path forming section by moving, the distance between the end of the movable member and the other magnetic path forming section becomes smaller. The magnetic flux between them causes an attractive force to act on the other magnetic path forming portion side.

By these actions, the attraction force to one magnetic path forming portion side at the end of energization of the solenoid body can be suppressed, and the operating noise at the time of collision between the axial direction regulating member of the movable member and the movable member. Also, vibration can be reduced.

[Brief description of drawings]

FIG. 1 is an overall sectional view of a solenoid according to an embodiment of the present invention.

2A and 2B are schematic diagrams showing movement of the plunger when the solenoid of FIG. 1 is energized. FIG. 2A shows a plunger position at the beginning of energization, and FIG. 2B shows a plunger position during energization. FIG. 7C shows the plunger position at the end of energization.

FIG. 3 is an overall sectional view of a conventional solenoid.

4A and 4B are schematic diagrams showing movement of the plunger when the solenoid of FIG. 3 is energized. FIG. 4A shows a plunger position at the start of energization, and FIG. 4B shows a plunger position at the end of energization. Is shown.

[Explanation of symbols]

 1 Solenoid 2 Guide Hole 3 Solenoid Main Body 4 Plunger (Movable Member) 41 Through Hole 42 Tapered Part 5 Upper Plate (Magnetic Path Constituent) 51 Hole 6 Lower Plate (Magnetic Path Constituent) 61 Hole 7 First Regulation Member 71 Hole 72 Fitting portion 8 Second regulating member 81 Hole 82 Fitting portion 9 Case 10 First cap 10A Hole 10B Flange portion 10C Convex portion 11 Second cap 11A Hole 11B Flange portion 11C Convex portion 12 First sleeve 12A Flange portion 12B Recessed portion 13 2nd sleeve 13A recess 14 bobbin 15 coil 16 sleeve 17 rod 18 1st closing member 18A hole 18B insertion hole 19 2nd closing member 19A hole 19B insertion hole 20 spring 21 lead wire 22 tube 23 mating part 24 magnetic path A part 25 Magnetic path B section 26 Plunger A section 27 Nja B section 30 the flux I 31 flux II 32 flux III

Claims (1)

[Claims] 1. A solenoid body having a guide hole therein, a movable member made of a magnetic material that is reciprocally inserted into the guide hole of the solenoid body, and positioned at both axial end portions of the movable member. A magnetic path forming portion that is provided on the outer periphery of the guide hole and forms a magnetic path with the movable member, and a restricting member that restricts the axial movement of the movable member are provided, and the solenoid main body is energized so that In a solenoid for magnetically attracting a movable member to the one magnetic path forming portion side and for restricting axial movement of the movable member by the restricting member, the one magnetic path forming part is provided at an axially intermediate portion of the movable member. A solenoid having a taper portion having a diameter reduced from one side toward the other magnetic path forming portion side.