JP2016131163A - solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid having a variation in the size of a magnetic gap, that is minimized regardless of whether or not there is a manufacturing error, an assembly error or the like of the components constituting the solenoid.SOLUTION: A solenoid has a coil 6 provided cylindrically, a housing 2 provided to cover the one end side and the outer peripheral surface of the coil 6, a sleeve 3 provided on the inside of the coil 6, a body 4 provided on the other end side of the coil 6, and a plunger 7 provided between the sleeve 3 and the body 4 relatively movably in the axial direction of the housing 2. The body 4 and the sleeve 3 are coupled integrally via a cylinder 5 composed of a nonmagnetic material. The sleeve, cylinder, body and plunger are mounted relatively movably in the axial direction for the housing, and in the electrification state to the coil, the housing and the sleeve are held in contact state by a magnetic force.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solenoid used for a solenoid valve for various hydraulic / pneumatic control devices such as a shock absorber.

Conventionally, as this type of solenoid, for example, there is one shown in FIG. 2 (hereinafter referred to as “conventional technology”, for example, see Patent Document 1).
In FIG. 2, the solenoid 50 includes a base 51, a sleeve 52, a plunger 53, a shaft 54, a gap embedded body 55, a housing 56, a bobbin 57, a coil 58, a mold resin 59, and the like as its constituent parts. The end of the shaft 54 cooperates with a hydraulic valve provided in a mother machine (not shown), and drives the hydraulic valve to open and close.

  As a magnetic path constituent member for guiding the magnetic flux of the coil 58, a housing 56, a sleeve 52, a plunger 53, and a base 51 are provided, which are each formed of a magnetic material.

In the solenoid 50 having the above configuration, a current is supplied to the coil 58 through the terminal 60, whereby a base 51, a housing 56, a sleeve 52, a plunger 53, and a magnetic circuit returning to the base 51 are formed. Magnetically attracted to the base 51.
When no current is supplied to the coil 58, the plunger 53 is positioned away from the base 51 by receiving a biasing force from a spring (not shown) or the like.

  In the above prior art, a solenoid main body (base 51, sleeve 52, plunger 53, shaft 54, gap buried body 55, bobbin 57, coil 58, and mold resin 59 housed in a housing 56 that functions as a magnetic path constituting member. In order to fix the relative position in the axial direction with respect to the housing 56, an annular step 61 is formed at the open end of the housing 56. The annular step portion 61 is formed in a planar shape orthogonal to the center line O and constitutes a seating surface for the base 51. The inner surface 51b of the base flange portion 51a abuts on the annular step portion 61 of the housing 56, and the base flange portion. 51 a is fitted into the housing 56.

  In order to assemble the solenoid main body in the housing 56, the sleeve 52 is pushed into the housing 56, then the gap buried body 55 is pushed in, and finally the base 51 is pushed in, and the caulking portion formed at the open end of the housing 56 The base 51 is prevented from coming off by crimping 62 to engage with the base flange 51a.

In this prior art, when the gap buried body 55 is an elastic body (for example, rubber, plastic) or a gap, the magnetic gap G formed by the base 51 and the sleeve 52 is the inner surface of the housing 56 on which the sleeve 52 abuts. 56a and the annular step 61 are determined by the axial length dimension A, the inner surface 51b and the length dimension B of the base collar 51a of the base 51, and the axial length dimension C of the sleeve 52. Due to the accumulation of manufacturing errors, assembly errors, and the like of the members, there is a problem that the variation becomes large and the variation in suction characteristics becomes large.
On the other hand, when the gap burying body 55 is a rigid body (for example, nonmagnetic metal), the base flange 51a of the base 51 is brought into contact with the annular step portion 61 of the housing 56 and fixed by caulking. If the axial dimensional accuracy is not high, for example, if the axial length of the solenoid body is larger than the axial length of the housing 56, the caulking force will act excessively on the solenoid body. There is a problem that the member is damaged, and when the axial length of the solenoid body is smaller than the axial length of the housing 56, a gap is formed in the axial direction of the sleeve 52 and the housing 56. As a result, there is a problem that magnetic leakage occurs between the two, resulting in poor magnetic efficiency.

JP 2010-117099 A

  The present invention has been made to solve the above-described problems of the prior art, and minimizes the variation in the size of the magnetic gap regardless of whether there are manufacturing errors and assembly errors of the members constituting the solenoid. The object is to provide a limited solenoid.

In order to achieve the above object, the solenoid of the present invention is firstly,
As a magnetic circuit constituent member for guiding the magnetic flux of the coil, a housing, a sleeve, a plunger and a body made of a magnetic material are provided,
A solenoid formed with a magnetic circuit that returns to the housing through the housing, sleeve, plunger and body,
The coil provided in a cylindrical shape;
The housing provided to cover one end side and the outer peripheral surface of the coil;
The sleeve provided inside the coil;
The body provided on the other end side of the coil;
The plunger provided between the sleeve and the body so as to be relatively movable in the axial direction of the housing;
The body and the sleeve are integrally connected via a cylinder made of a nonmagnetic material, and the sleeve, the cylinder, the body, and the plunger are axially movable relative to the housing. The housing and the sleeve are held in contact with each other by a magnetic force when the coil is energized.
According to this feature, since the body and the sleeve are integrally connected via a cylinder made of a non-magnetic material, the magnetic gap can be obtained regardless of whether there is a manufacturing error, an assembly error, or the like of the members constituting the solenoid. Variation in size can be minimized, and as a result, variation in suction force characteristics can be reduced.
In addition, the body is provided with a sliding contact surface that slidably contacts the housing in the axial direction, so the sleeve, cylinder, body, coil, and plunger, which are solenoid bodies, can move relative to the housing in the axial direction. The magnetic circuit can be formed while simplifying the design because positioning by mechanical fixing is not required and it is not necessary to adopt a mechanical fixing structure.
In addition, unlike the prior art, the solenoid body is not fixed to the housing by caulking, so that the problem of damage to the solenoid body can be solved.
Furthermore, since the solenoid can be easily disassembled, parts can be easily replaced if the solenoid body is damaged.
Furthermore, in the energized state of the coil, since the housing and the sleeve are held in contact with each other by magnetic force, the clearance gap between the housing and the sleeve can be eliminated, and there is no magnetic leakage between the two. It becomes a structure with good magnetic efficiency and can increase the attractive force.

According to a second aspect of the solenoid of the present invention, in the first feature, the body has a sliding contact surface that is slidably in contact with the housing in an axial direction of the housing.
Thirdly, the solenoid according to the present invention is characterized in that, in the first or second feature, the sleeve, the cylinder, the body, and the plunger are within the range in which the sleeve can contact the housing by magnetic force. It is characterized in that it can be moved relative to the housing in the axial direction.

Further, according to a fourth aspect of the solenoid of the present invention, in any one of the first to third features, the housing is formed in a cup shape, and the interior of the housing faces the bottom of the cup shape. The sleeve, the cylinder, and the body are inserted in this order.
According to this feature, the configuration of the solenoid can be simplified.

According to a fifth aspect of the solenoid of the present invention, in any one of the second to fourth features, the body has a step shape having a small diameter portion and a large diameter portion, and the small diameter portion is the cylinder. The large-diameter portion has the sliding surface facing the inner surface of the side portion of the housing with a gap, and an O-ring is mounted on the outer peripheral surface of the large-diameter portion. It is said.
According to this feature, the solenoid main body can be held at the shaft center by the body and the inside of the housing can be sealed.

According to a sixth aspect of the present invention, there is provided the solenoid according to any one of the first to fifth aspects, wherein the coil is disposed in proximity to a stepped portion of the body, and the sleeve is disposed in the housing from the coil. It is arrange | positioned so that it may protrude toward the said bottom part.
According to this feature, the contact between the sleeve and the handling can be ensured.

The present invention has the following excellent effects.
(1) Since the body and the sleeve are integrally connected via a cylinder made of a non-magnetic material, the size of the magnetic gap is maintained regardless of whether there are manufacturing errors or assembly errors of the members constituting the solenoid. Variation can be minimized, and as a result, variation in suction force characteristics can be reduced.
(2) The sleeve, cylinder, body, coil, and plunger, which are solenoid bodies, are mounted so as to be relatively movable in the axial direction with respect to the housing. Since it is not necessary to adopt a structure, the design can be simplified.
In addition, unlike the prior art, the solenoid body is not fixed to the housing by caulking, so that the problem of damage to the solenoid body can be solved.
Furthermore, since the solenoid can be easily disassembled, parts can be easily replaced if the solenoid body is damaged.

(3) In the energized state of the coil, the housing and the sleeve are kept in contact with each other by the magnetic force, so the clearance gap between the housing and the sleeve can be eliminated, and the magnetic leakage between the two is eliminated. Thus, the magnetic efficiency is improved and the attractive force can be increased.

It is sectional drawing which shows the solenoid which concerns on the Example of this invention. It is sectional drawing which shows the solenoid of a prior art.

  EMBODIMENT OF THE INVENTION With reference to drawings, the form for implementing this invention is demonstrated illustratively based on an Example below. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

A solenoid according to an embodiment of the present invention will be described with reference to FIG.
The solenoid 1 includes a housing 2, a sleeve 3, a body 4, a cylinder 5, a coil 6, and a plunger 7.

  The housing 2 is formed of a magnetic material and is formed in a cup shape having an opening 2a, a bottom 2b, and a side 2c. The side 2c covers the outer periphery of the coil 6 and the bottom 2b extends in the axial direction of the coil 6. One end is covered and magnetic flux is passed by energization of the coil 6. The opening 2 a is used for housing the sleeve 3, the body 4, the cylinder 5, the coil 6, the plunger 7 and the like inside the housing 2. Further, a through hole 2d for passing the lead wire 8 is provided near the center of the bottom 2b.

The sleeve 3 is formed from a magnetic material into a bottomed cylindrical shape, and a plunger 7 is accommodated in an internal space 3b following the open end 3a so as to be movable in the axial direction. A small diameter portion 3c is provided on the outer periphery of the internal space 3b. The cylindrical portion on one side in the axial direction of the cylinder 5 constituting the magnetic shielding portion is integrally fitted to the small diameter portion 3c.
Further, the tip 3 e on the bottom 3 d side of the sleeve 3 protrudes in a cylindrical shape and is formed in a shape capable of coming into contact with the flat bottom surface 2 e of the bottom 2 b of the housing 2. A lead wire 8 is wired in the recess 3f of the tip 3e. The sleeve 3 is disposed coaxially with the center line O of the solenoid 1.
In the present invention, since the magnetic path is formed between the bottom 2b of the housing 2 and the tip 3e of the sleeve 3 in contact with each other, the housing 2 and the sleeve 3 that have been conventionally used are used. A plate member for forming a magnetic path by connecting them in the radial direction is omitted.

The body 4 is made of a magnetic material and is formed in a stepped shape having a small diameter portion 4a and a large diameter portion 4b. The end of the small diameter portion 4a has an opening end 3a of the sleeve 3 and a magnetic gap G. Confront. The cylindrical portion on the other side in the axial direction of the cylinder 5 is integrally fitted to the outer periphery of the small diameter portion 4a. The large-diameter portion 4b has a sliding contact surface slidably in contact with the inner surface of the side portion 2c of the housing 2 on the outer peripheral side, and the sliding surface is slightly spaced from the inner surface of the side portion 2c of the housing 2. An O-ring groove 4c in which an O-ring 9 is mounted is provided on the outer peripheral surface of the large-diameter portion 4b.
Note that the slidable contact means that the housing and the body slide relative to each other, and that the magnetic circuit can be formed or contacted while having a gap α between the housing 2 and the body. doing.
The gap α is necessary for the body 4 to move relative to the housing 2, but serves to hold the body 4 coaxially with the center line O of the solenoid 1 and to form a magnetic circuit. For this reason, a smaller one is better for forming a magnetic circuit.
When the O-ring 9 is attached, the inside of the housing 2 is sealed by the O-ring 9. The frictional force generated by the O-ring 9 is a magnetic force between the body 4 and the housing 2 when the coil 6 is energized. Thus, it is set to be small so as to be relatively movable in the axial direction.
The O-ring 9 can be omitted when the airtight structure is not required.

  The cylinder 5 is a member that prevents a magnetic flux from passing directly between the sleeve 3 and the body 4, and is formed in advance in a substantially cylindrical shape with a nonmagnetic material. The cylinder 5 has a cylindrical shape as a whole, and is provided with a convex portion 5a having a width of the magnetic gap G on the inner peripheral side of the center, and the cylindrical portions 5b and 5c on both sides are respectively connected to the small diameter portion 3c of the sleeve 3. And the small diameter part 4a of the body 4 is fitted. For this reason, the sleeve 3 and the body 4 are integrally connected via the cylinder 5.

The coil 6 is obtained by winding a number of conductive wires with an insulating coating around a resin bobbin 10 and is electrically connected to the lead wire 8. The inner peripheral surface of the bobbin 10 is fitted to the outer peripheral surface of the sleeve 3 and the outer peripheral surface of the cylinder 5, and the outer diameter side of the flange portions 10 a and 10 b at both ends in the axial direction is spaced from the inner surface of the side portion 2 c of the housing 2. It is formed in the size to have.
Further, the flange portion 10b on the body 4 side of the bobbin 10 is disposed close to the stepped portion 4d of the body 4, and the flange portion 10a on the opposite side is a bottom portion so as to have a space between the bottom portion 2b of the handling 2. 2b is spaced apart in the axial direction. Therefore, the sleeve 3 is disposed so as to protrude from the coil 6 toward the bottom 2b of the hanging 2 in the axial direction.

The plunger 7 is formed of a magnetic material in a cylindrical shape, and is disposed so as to be movable in the axial direction in a space formed inside the internal space 3 b of the sleeve 3 and the small diameter portion 4 a of the body 4. A rod 11 is integrally fitted in the center of the plunger 7. The rod 11 is moved as the plunger 7 is actuated in the axial direction by the axial suction driving force by the small diameter portion 4 a of the body 4 generated by energizing the coil 6. The movement of the rod 11 in the axial direction is transmitted to the spool of the valve body of the hydraulic / pneumatic device connected to the rod 11, for example.
The sleeve 3 side of the rod 11 is supported by a bearing 12 fixed to the sleeve 3, and the body 4 side is supported by a bearing 14 provided in a plug (bearing holding member) 13 fitted in the hole 4 e of the body 4. Has been.

In the solenoid 1 having the above configuration, the current is supplied to the coil 6 through the lead wire 8 to form the case 2, the sleeve 3, the plunger 7, the body 4, and the magnetic circuit L that returns to the case 2, and the plunger 7 is magnetically attracted to the small diameter portion 4a which is a magnetic attraction portion of the body 4 and is moved in the axial direction. The movement of the plunger 7 in the axial direction is transmitted to, for example, the spool of the valve body of the hydraulic / pneumatic device connected to the rod 11.
When no current is supplied to the coil 6, the plunger 7 is positioned away from the plug 13 by receiving a biasing force from a spring (not shown) or the like.

In the present embodiment, in particular, the solenoid 1 is integrally connected to the body 4 and the sleeve 3 via a cylinder 5 made of a nonmagnetic material, and the sleeve 3, the cylinder 5, the body 4, the coil 6, and the like. The plunger 7 (hereinafter also referred to as “solenoid main body”) is mounted so as to be movable relative to the housing 2 in the axial direction. When the coil 6 is energized, the housing 2 and the sleeve 3 are moved by magnetic force. It is characterized by being configured to be held in contact.
Incidentally, the solenoid body portion is relatively movable mounted axially relative to the housing 2, the term "relatively movable" in, in the non-energized state of the coil 6, the main member of the solenoid within the housing 2 On the other hand, it means that it is physically or mechanically unfixed. The non-fixed state is a state in which the main member can move relative to the housing 2 by the generation of a magnetic force caused by energization of the coil 6 even when there is no fixed state or there is some frictional force between the two. Means a state.

The solenoid 1 of the present embodiment has the above-described configuration and has the following remarkable effects.
(1) Since the body 4 and the sleeve 3 are integrally connected via a cylinder 5 made of a non-magnetic material, the magnet 4 is magnetic regardless of whether there are manufacturing errors, assembly errors, etc. of the members constituting the solenoid 1. The variation in the size of the gap G can be minimized, and as a result, the variation in the attractive force characteristic can be reduced.
That is, in the prior art shown in FIG. 2, the magnetic gap G has the axial length dimension A between the inner surface 56 a of the sleeve 52 of the housing 56 and the annular step 61, and the inner surface of the base flange 51 a of the base 51. 51b and the length dimension B to the tip and the axial length dimension C of the sleeve 52, the variation is large and the attraction force characteristic is large. In this embodiment, the magnetic gap G is Since it is determined only by the dimensions of the cylinder 5, the variation is remarkably reduced, and the variation of the attractive force characteristic is also remarkably reduced.
(2) The sleeve 3, cylinder 5, body 4, coil 6, and plunger 7, which are solenoid bodies, are mounted so as to be relatively movable in the axial direction with respect to the housing 2, so that positioning by mechanical fixation is unnecessary. The design can be simplified because it is not necessary to adopt a mechanical fixing structure.
Further, when the solenoid main body is fixed to the housing 2 by caulking as in the prior art, the axial dimensional accuracy of the housing 2 and the solenoid main body is not formed high, for example, the shaft of the solenoid main body When the length in the direction is larger than the length in the axial direction of the housing 2, there is a problem that the caulking force acts excessively on the solenoid body and the solenoid body is damaged. The solenoid can solve the problem of such damage to the solenoid body.
Furthermore, since the solenoid can be easily disassembled, parts can be easily replaced if the solenoid body is damaged.
(3) When the coil 6 is energized, the housing 2 and the sleeve 3 are held in contact with each other by the magnetic force, so that the clearance gap between the housing 2 and the sleeve 3 can be eliminated. This eliminates the magnetic leakage in the magnetic field, makes it possible to increase the attractive force by providing a configuration with good magnetic efficiency.
Further, since the relative position of the solenoid body in the axial direction with respect to the housing 2 is fixed when the coil 6 is energized, there is no problem even when it is used for the operation of the valve body of the hydraulic / pneumatic device, for example. The goal can be achieved. That is, there is no problem that the relative position in the axial direction of the solenoid body is not fixed with respect to the housing 2 when the coil 6 is not energized.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the case where the sleeve 3 has a bottomed cylindrical shape has been described.

  For example, in the above-described embodiment, the case where the O-ring 9 is mounted on the outer peripheral surface of the body 4 has been described. However, the present invention is not limited to this, and for example, the O-ring may be omitted or the O-ring may be omitted. The object of the present invention can be achieved even if another member is provided on the inner peripheral side of the housing 2 so that the solenoid body does not come out.

DESCRIPTION OF SYMBOLS 1 Solenoid 2 Housing 2a Opening part 2b Bottom part 2c Side part 2d Through-hole 2e Bottom surface 3 Sleeve 3a Opening end part 3b Internal space 3c Small diameter part 3d Bottom part 3e Bottom end 3f Concave part 4 Body 4a Small diameter part 4b Large diameter part 4c O-ring Groove 4d Step 4e Hole 5 Cylinder 5a Protrusion 5b 5c Cylindrical part 6 Coil 7 Plunger 8 Lead wire 9 O-ring 10 Bobbin 10a, 10b Flange part 11 Rod 12 Bearing 13 Plug (bearing holding member)
14 Bearing G Magnetic gap α Clearance

Claims (6)

As a magnetic circuit constituent member for guiding the magnetic flux of the coil, a housing, a sleeve, a plunger and a body made of a magnetic material are provided,
A solenoid formed with a magnetic circuit that returns to the housing through the housing, sleeve, plunger and body,
The coil provided in a cylindrical shape;
The housing provided to cover one end side and the outer peripheral surface of the coil;
The sleeve provided inside the coil;
The body provided on the other end side of the coil;
The plunger provided between the sleeve and the body so as to be relatively movable in the axial direction of the housing;
The body and the sleeve are integrally connected via a cylinder made of a nonmagnetic material, and the sleeve, the cylinder, the body, and the plunger are axially movable relative to the housing. The solenoid is configured so that the housing and the sleeve are held in contact with each other by a magnetic force when the coil is energized. The solenoid according to claim 1, wherein the body has a sliding contact surface that is slidably contacted with the housing in an axial direction of the housing. 2. The sleeve, the cylinder, the body, and the plunger are provided so as to be movable relative to the housing in an axial direction within a range in which the sleeve can contact the housing by magnetic force. 2. The solenoid according to 2.   The said housing is formed in a cup shape, The said sleeve, the said cylinder, and the said body are inserted in the inside of the said housing toward the bottom part of the said cup shape. 4. The solenoid according to any one of items 3.   The body has a stepped shape having a small-diameter portion and a large-diameter portion, the small-diameter portion is connected to the cylinder, and the large-diameter portion is opposed to the inner side surface of the housing with a gap. The solenoid according to any one of claims 2 to 4, wherein the solenoid has a sliding contact surface, and an O-ring is attached to an outer peripheral surface of the large-diameter portion. The said coil is arrange | positioned adjacent to the step part of the said body, and the said sleeve is arrange | positioned so that it may protrude toward the said bottom part of the said housing from the said coil. The solenoid according to any one of the above.

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