JPH09283331A - Solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve noise reduction effect by providing a cushion member with a pair of shock absorbing parts which abut each other with reciprocating movement of a movable plunger so as to absorb the shock. SOLUTION: In a solenoid 21, the washer plate 54 of a movable plunger 5a abuts on a shock absorbing part 75 of a cushion member 7A formed by using rubber as a soft elastic material and its is compressed during the transient period of time when the current is not applied to the time when the current is applied. At the time of shift from current applying time to current non- applying time, a shoulder part 52 of the movable plunger 5a abuts on the shock absorbing part 75 of the cushion member 7A and it is compressed. Shock absorbing parts 74 and 75 of the compressed cushion member 7A absorb and relieve the sock by means of the movable plunger 5a with self elastic reaction force as the shift of the movable plunger 5a. Thus, sound reduction effect improves.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a solenoid.

[0002]

2. Description of the Related Art As a conventional solenoid, for example, in Japanese Unexamined Patent Publication No. Hei 7-36408, the magnetic force lines attract the urging force of a fixed iron core acting as an electromagnet to act in the negative direction, and when demagnetizing the fixed iron core. With a flat double-sided shape, each of which comes into contact with the closed shape portion of the coil bobbin that functions as a stopper that defines the operation range of the movable iron core (movable plunger) that operates in the other direction opposite to the above-mentioned direction by the biasing force of the spring. A configuration using two silencers is disclosed.

[0003]

[Problems to be Solved by the Invention]

(1) Usually, as an application example of a solenoid, for example, when the movable iron core is used with a long operating stroke, the collision stress acting on the closed shape portion of the coil bobbin that functions as a stopper increases. In this case, the flat double-sided sound deadening material cannot absorb the increased collision stress due to the low absorption of collision energy, and the sound deadening effect is reduced. (2) Further, the sound deadening material is constructed so as to be brought into contact with the closed shape portion of the coil bobbin that functions as a stopper when the movable iron core operates in the negative direction and the other direction, and at least 2 It requires the number of parts and limits the number of parts.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a solenoid capable of improving the sound deadening effect as compared with the sound deadening material and reducing the number of parts.

[0005]

According to a first aspect of the present invention, a solenoid has a cylindrical coil bobbin, and a coil wound around the outer circumference of the coil bobbin to generate magnetic force lines according to an applied current value.
A housing having cores that are respectively arranged to face the cylindrical holes of the coil bobbin and that act as electromagnets by the lines of magnetic force; and a movable plunger that is attracted to the core to operate.
A solenoid comprising a cushion member fixed to an end portion side of the housing or an end portion side of the coil bobbin and abutting against an end portion of the movable plunger, the cushion member being inserted by the movable plunger. A ring-shaped base portion having a central hole and held on the end portion side of the coil bobbin or on the end portion side of the housing, and projecting from both dorsal faces of the base portion on both axial sides of the movable plunger. , And a pair of shock absorbing portions facing each other and absorbing shock by reciprocating movement of the movable plunger.

According to a second aspect of the invention, in the construction of the first aspect, the base portion of the cushion member has an annular groove to be held on its outer peripheral portion. In the solenoid according to a third aspect of the present invention, in the configuration of the first aspect, the cushion member is physically formed of a soft elastic material together with the base portion and the pair of shock absorbing portions. According to a fourth aspect of the solenoid of the present invention, in the structure of the first aspect, the pair of shock absorbing portions of the cushion member are formed into a plurality of elastic pieces and bodies extending from the outer peripheral portion in the central direction and the circumferential direction and divided by slits. Has been formed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The cushion member used in the solenoid of the present invention is made of, for example, rubber [NR (natural rubber), CR (chloroprene rubber), NB as a soft elastic material.
R (acrylonitrile butadiene rubber)], elastomer, plastomer, synthetic resin [PBT (polybutylene terephthalate), PA (polyamide), POM
(Polyacetal)] and the like can be used.

The cushion member is provided on a side of the coil bobbin facing the bottom end of a cylindrical end portion formed on the coil bobbin as a held member and a bottomed cylindrical housing made of a magnetic material having the core, and in a cylinder hole of the coil bobbin. The movable plungers, which are arranged facing each other, may be formed separately from the tubular end portion of the other end side housing made of a non-magnetic material and guided to the axial direction thereof, and then mounted on the tubular end portions. it can.

Further, the cushion member may be formed integrally with the tubular end portion of the coil bobbin or the tubular end portion of the other end side housing when resin molding is performed with a molding die. Further, the shock absorbing portions, which project from the both back surfaces of the base portion of the cushion member toward both axial sides (the forward moving direction side and the backward moving direction side) of the movable plunger, may be, for example, both back facing sides of the base portion. It can be formed by a plurality of conical shapes, cylindrical shapes, hemispherical shapes, etc. that have a constant height and size of protrusion from the surface and are arranged at equal intervals in the circumferential direction.

The protruding height and size of the pair of shock absorbing portions, the shape, the kind of soft elastic material, etc. can be variously set according to the purpose.

[0011]

【Example】

(Embodiment 1) Embodiment 1 of the solenoid of the present invention will be described with reference to FIGS. The solenoid 1 of the first embodiment shown in FIG. 1 is made of a magnetic material and is arranged to face a coil bobbin 2 made of a cylindrical non-magnetic material, a coil 3, and a cylindrical hole 200 of the coil bobbin 2 at a predetermined interval. Core 4a
And a bottomed cylindrical housing 4b made of a magnetic material for holding the core 4a and having the other end opened, a movable plunger 5a made of a magnetic material, the core 4a and the movable plunger 5a.
And a cushion member 7A fixed to the coil bobbin 2.

The coil bobbin 2 is made of a resin [PBT (polybutylene terephthalate)] formed by a molding die. The coil bobbin 2 protrudes outward in the radial direction at the cylindrical portion 20 and at the end side and the other end side of the cylindrical portion 20, respectively. The flange-shaped end-side mounting engagement portion 21 and the other end-side mounting engagement portion 22, and the tubular portion 20.
Is extended from the position of the other end side attachment engaging portion 22 by about 14 mm and a protruding cylindrical portion 23.

Further, the other end side attachment engaging portion 22 is formed with a plurality of locking projections 220 on its minus end face side. Approximately 1 mm inside the radius at the tip of the protruding tubular portion
A bent locking protrusion 230 is formed. The coil 3 is wound around the outer circumference of the coil bobbin 2 in a tubular shape to generate a magnetic force line according to an applied current value.

The core 4a is cylindrical and has a movable plunger 5.
A through hole 41 that forms a tapered recess 40 is provided on the side opposite to a, and the coil bobbin 2 is arranged in a state of being fixedly held in the cylindrical hole 200 on the negative end side, leaving the negative end portion 42. The bottom end center hole 43 of the housing 4b, which is arranged so as to cover the outside of the coil 3, is fitted into the minus end portion 42.

Therefore, the core 4a, together with the housing 4b, forms a ring-shaped magnetic path that passes through the central hole 30 and the outer peripheral side of the cylindrical coil 3. Movable plunger 5
Reference character a denotes a columnar portion 50 movably held in the cylindrical hole 200 of the coil bobbin 2, and a tapered portion 51 on the side of the columnar portion 50 facing the tapered concave portion 40 of the core 4a.
And the interlocking rod 5b inserted through the through hole 41 of the core 4a so as to be movable. A cam member 5c is coupled to the interlocking rod 5b at a tip end portion of the interlocking rod 5b which protrudes outside from the through hole 41 of the core 4a.

The cylindrical portion 50 has a small-diameter cylindrical portion 53 extending outward from the protruding cylindrical portion 23 of the coil bobbin 2 on the other end side (the side opposite to the tapered tip portion 51 portion). At the boundary between the cylindrical portion 50 and the small diameter cylindrical portion 53,
In order to limit the movement of the movable plunger 5a in the direction away from the core 4a (see arrow Y2), a shoulder portion 52 that functions as a movable stopper that locks with the locking projection 230 of the coil bobbin 2 is formed. The core 4a of the movable plunger 5a is attached to the tip of the small diameter cylindrical portion 53.
In order to limit the movement of the coil bobbin 2 in the direction of approaching (see arrow Y1), a washer plate 54 that functions as a movable stopper that locks with the locking projection 230 of the coil bobbin 2 is mounted.

The coil spring 6 is inserted into the interlocking rod 5b of the movable plunger 5a, and is arranged in the seat portion 510 on the tip end side of the tapered portion 51 and the seat portion 410 formed in the through hole 41 of the core 4a. Cushion member 7A
Is formed by using rubber [NBR (acrylonitrile butadiene rubber)] as the soft elastic material. As shown in the enlarged views 2 and 3, the cushion member 7A has a central hole 70 through which the small-diameter cylindrical portion 53 of the movable plunger 5a is inserted.
And a ring-shaped base portion 71 having an outer peripheral portion 710 that is held by the protruding cylindrical portion 23 of the coil bobbin 2, and projecting in opposite directions to both back facing surfaces 72 and 73 of the base portion 71, respectively. It consists of shock absorbing parts 74 and 75.

The base portion 71 has an annular groove 711 on its outer peripheral portion 710 that fits into the locking projection 230 of the protruding cylindrical portion 23. The annular groove 711 has a groove width of about 1 mm and a groove depth of about 1 m.
m. The above values are not limited and can be set variously. -Pair of shock absorbers 74 and 75
Has a function of absorbing a shock that abuts against the washer plate 54 and the shoulder portion 52 that abut when the movable plunger 5a reciprocates (moves in the arrow Y1 direction and the arrow Y2 direction).

That is, the shock absorbing portion 74 projects to a position facing the shoulder portion 52 of the cylindrical portion 50 of the movable plunger 5a, and the shock absorbing portion 75 is attached to the washer plate 54 of the small diameter cylindrical portion 53 of the movable plunger 5. It is formed of four projecting portions formed at intervals of 90 ° in the circumferential direction together with the projecting portions at the opposing positions. The pair of shock absorbing parts 74, 75
Is a substantially conical shape having a height h1 of 1 mm from both back-facing surfaces 72 and 73 of the base 71 and a maximum diameter of 1.3 mm, and is symmetrical. The shape, the number, the size, etc. of the pair of shock absorbing parts 74, 75 are not limited to the above-mentioned case, and can be variously set according to the purpose.

The solenoid 1 of the first embodiment constructed as described above is moved from the state in which no current is applied as shown in FIG. 1 to the state in which current is applied as shown in FIG.
In the direction of approaching the core 4a (see arrow Y1), or vice versa, depending on the state of current application, the movable plunger 5a is moved away from the core 4a (see arrow Y2). ) To use.

In the solenoid 1 of the first embodiment, when the current is not applied and the current is applied, the washer plate 54 of the movable plunger 5a comes into contact with the shock absorbing portion 75 of the cushion member 7A and compresses, The shoulder 52 of the movable plunger 5a comes into contact with the shock absorbing portion 75 of the cushion member 7A and compresses during the transition from the time when the current is applied to the time when the current is not applied.

For this reason, the shock absorbing portion 74 or 75 of the cushion member 7A, which has been compressed by the movement of the movable plunger 5a, absorbs the shock of the movable plunger 5a by its own elastic reaction force and relaxes the shock. To do. As a result, a muffling effect is obtained. That is, the cushion member 7A in the solenoid of the first embodiment is different from the conventional sound absorbing material that receives the impact caused by the forward movement and the backward movement of the movable plunger 5a on the flat surface of the related art, the pair of impact absorbing portions 74, 75 receives three-dimensionally and elastically deforms by receiving collision stress intensively from the protruding tip side, so that the strain of each shock absorbing portion 74, 75 increases, and the impact force can be moderately relaxed by this amount, and the sound deadening effect Can be increased.

The shock absorbing portion 7 of the cushion member 7A
4 or 75, the relationship between the load (gf) applied by the movable plunger 5a and the deflection amount (mm) was measured by a load / deflection measuring device, and as shown in FIG. It has been confirmed that the characteristic shown by the line E2 is obtained at the time of returning when the application of the load by the movable plunger 5a is released.

Further, the number of the cushion member 7A mounted on the locking projection 230 of the projecting cylinder portion 23 of the coil bobbin 2 is one (single item), and the ring-shaped base 71 has a ring-shaped base 71 for holding the cushion member 7A. Since it has the groove 711, the locking projection 23 formed on the protruding tubular portion 23 of the coil bobbin 2
By mounting it on 0, it can be fixedly held, the assembling is easy and the workability can be improved, the assembling process can be simplified, and the assembling can be performed efficiently.

As described above, according to the solenoid 1 of the first embodiment, the shocks when the movable plunger 5a is moved forward and backward can be mitigated by the paired shock absorbing portions 74 and 75. Compared to the case of using two silencers, the number of parts constituting the solenoid 1 can be reduced. (Modification 1) A solenoid 1A of Modification 1 shown in FIG.
A non-magnetic resin [PBT (polybutylene terephthalate) tubular other end side housing a is used to cover the outer peripheral portion of the bottomed cylindrical part 4b made of the magnetic material of the solenoid 1 and the other end side housing a is used. The cushioning member 7A is attached to the locking projection 230a of the protruding tubular portion 23a formed on the a.
The configuration is the same as that of the solenoid 1 of the first embodiment except that the coil bobbin 2a having no protruding cylinder portion 23 is used instead of the coil bobbin 2 having the protruding cylinder portion 23.

The solenoid 1A of the first modification has the same effects as the solenoid 1 of the first embodiment. (Second Modification) Solenoid 1B of Modification 2 shown in FIG.
Is a non-magnetic body attached to the upper opening side (the other end side attachment engaging section 22 side of the coil bobbin 2a of Modification 1) facing the bottom of the bottomed cylindrical portion 4b made of a magnetic body of the solenoid 1. A resin-made [PBT (polybutylene terephthalate) lid-shaped other end side housing b is used, and the cushioning member 7A is attached to the locking projection 230b of the protruding tubular portion 23b formed in the other end side housing b. Other than the above, the configuration is the same as that of the solenoid 1 of the first embodiment.

The solenoid 1B of the second modification has the same effects as the solenoid 1 of the first embodiment. (Embodiment 2) Embodiment 2 of the solenoid of the present invention is based on FIGS. 8 to 10, and used in FIGS.
Explanation will be made with the help of

The solenoid 1C of the second embodiment shown in FIG.
Locking protrusion 230 of protruding cylindrical portion 23 in solenoid 1 of the first embodiment, locking projection 230a of protruding cylindrical portion 23a of solenoid 1A of the first modified example, locking locking protruding protrusion 23b of solenoid 1B in the second modified example. In place of the cushion member 7A mounted on the projection 230b for use, except that the protruding cylindrical portions 23, 23a and 23b are integrally formed with a resin [PBT (polybutylene terephthalate) cushion member 7B is used. Have the same configuration.

Therefore, description of the same structure as the solenoid 1 of the first embodiment will be omitted, and only the cushion member 7B will be described. A pair of shock absorbing parts 74b, 7 of the cushion member 7B
5b includes a base 71b formed integrally with the protruding cylindrical portions 23, 23a and 23b, and a center O from the inner peripheral portion 710b.
Direction and the direction of the circumference S are formed into a plurality of elastic pieces 77 and a body which are divided from each other by slits 76.

According to the solenoid 1C of the second embodiment constructed as described above, the movable plunger 5a is moved from the state in which no current is applied as shown in FIG. 1 to the state in which current is applied as shown in FIG. Direction (see arrow Y1)
, Or vice versa, depending on the state when current is applied,
The movable plunger 5a is moved to a state at the time of applying an electric current and moved in a direction (see arrow Y2) away from the core 4a for use.

In the solenoid 1C, when the current is not applied and the current is applied, the washer plate 54 of the movable plunger 5a has the shock absorbing portion 75b of the cushion member 7B.
And elastically compresses the plurality of elastic pieces 77 in the compression direction so that the shoulder portion 52 of the movable plunger 5a becomes the shock absorbing portion 75b of the cushion member 7b during the transition from the time when the current is applied to the time when the current is not applied. It abuts and compresses, and further bends the plurality of elastic pieces 77 in the compression direction.

Therefore, according to the cushion member 7B in the solenoid 1C of the second embodiment, the movable plunger 5 is
The shock of the forward movement and the backward movement of a is paired with the shock absorbing portion 74.
b and 75b are three-dimensionally deformed and greatly distorted, and the elastic reaction force and the deformation of the plurality of elastic pieces 77 can alleviate the deformation. As a result, a muffling effect is obtained. That is, the cushion member 7B in the solenoid 1C according to the second embodiment differs from the conventional sound absorbing material that receives the impact associated with the forward and backward movements of the movable plunger 5a on the flat surface of the related art, as a pair of impact absorbing portions 74b. , 75b three-dimensionally and elastically deform by receiving collision stress from the protruding tip side in a concentrated manner, the strain of each shock absorbing portion 74b, 75b becomes large, and further, the plurality of elastic pieces 77 are deformed, As a result, the impact force can be relaxed more gently than in the case of the first embodiment, and the sound deadening effect can be enhanced.

The shock absorbing portion 7 of the cushion member 7B
4b or 75b, the relationship between the load (gf) applied from the movable plunger 5a and the bending amount (mm) is
As a result of the measurement by the load / deflection measuring device, as shown in FIG. 10, the characteristic shown by the line E3 at the time of pressing and the characteristic shown by the line E4 at the time of returning the application of the load by the movable plunger 5a are released. It was confirmed that it was obtained.

In the case of the solenoid 1C of the second embodiment, since the protruding cylindrical portions 23, 23a, 23b and the cushion member 7B formed integrally are used, the number of constituent parts is the same as that of the solenoid 1 of the first embodiment. Example 1 solenoid 1A,
This can be further reduced as compared to the case of the solenoid 1B of the second modification.

[0035]

According to the solenoid of the present invention, the cushion member has a central hole through which the movable plunger is inserted, or is a ring-shaped base portion held by a coil bobbin or a housing made of a non-magnetic material. One product that protrudes from the back surface on both sides in the axial direction of the movable plunger and abuts each other by the reciprocating motion of the movable plunger to absorb the impact-a pair of impact absorbing parts formed three-dimensionally, It is a so-called single item. Therefore, (1) the cushion member is one, and when the ring-shaped base portion is used while being held by the coil bobbin or the housing made of a non-magnetic material, the cushion member is not affected by forward and backward movements of the movable plunger. Since it can be mitigated by the pair of shock absorbing parts, the number of parts constituting the solenoid can be reduced as compared with the case of using the two sound deadening materials as in the conventional case. (2) Unlike the conventional sound deadening material that receives the impact caused by the forward and backward movements of the movable plunger on the flat surface, the cushion member receives the impact three-dimensionally by the pair of impact absorbing parts, and has a collision stress. Is concentrated and elastically deformed,
The distortion of each shock absorbing portion becomes large, and the shock force can be moderated by this amount, and the sound deadening effect can be enhanced. (3) The base portion of the cushion member has an annular groove to be held on the outer peripheral portion thereof, so that it can be attached to the attachment holding portion of the coil bobbin or the housing made of a non-magnetic material.
The assembling process can be simplified and the assembling can be performed efficiently. (4) Further, the cushion member is formed by a ring-shaped base portion which is integrally formed and held in a housing made of a coil bobbin or a non-magnetic material, and slits extending from the outer peripheral portion of the base portion in the central direction and the circumferential direction. By having a plurality of divided elastic pieces and a pair of shock absorbing parts formed in the plurality of elastic pieces, the elastic pieces can be formed simultaneously at the time of resin molding by a molding die of a coil bobbin or a housing made of a non-magnetic material.

In this case, the number of parts constituting the solenoid can be further reduced as compared with the case (1).

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state of a solenoid according to a first embodiment when a current is not applied.

FIG. 2 is a cross-sectional view showing an enlarged main part in FIG.

FIG. 3 is a plan view showing a plane of a main part in FIG.

FIG. 4 is a cross-sectional view showing a state of the solenoid of the first embodiment when a current is applied.

FIG. 5 shows the load (gf) applied to the cushion member on the vertical axis and the flexure amount (mm) on the horizontal axis when the movable plunger impacts the cushion member of the solenoid of the first embodiment. FIG.

FIG. 6 is a cross-sectional view showing a modified example 1 of the solenoid of the first embodiment when a current is not applied.

FIG. 7 is a cross-sectional view showing a modified example 2 of the solenoid of the first embodiment when a current is not applied.

FIG. 8 is an enlarged sectional view showing a main part of a solenoid according to a second embodiment.

FIG. 9 is a plan view showing a plane of a main part in FIG.

FIG. 10 shows a load (gf) applied to the cushion member on the vertical axis and a flexure amount (mm) of the cushion member on the horizontal axis when the movable plunger impacts the cushion member of the solenoid of the second embodiment. FIG.

[Explanation of symbols]

1, 1A, 1B, 1C ... Solenoid 2, 2a ... Coil bobbin 23, 23a, 23b ... Projecting cylinder part 230 ... Locking projection 3 ... Coil 4a ... Core 4b ... Bottomed cylindrical housing 5a made of magnetic material ... Movable Plunger a ... Cylindrical resin housing made of non-magnetic material 6 ... Coil spring b ... Lid-shaped resin housing made of non-magnetic material 7A, 7B ... Cushion 71, 71b ...
Ring-shaped base portion 710 ... Outer peripheral portion 710b ... Inner peripheral portion 711 ...
Annular groove 72, 72b, 73, 73b ... Back surface 74, 74b, 75, 75b ... Impact absorbing portion

Claims (4)

[Claims] 1. A cylindrical coil bobbin, a coil wound around the outer circumference of the coil bobbin to generate magnetic force lines according to an applied current value, and arranged to face a cylindrical hole of the coil bobbin, respectively, and act as an electromagnet by the magnetic force lines. A housing having a core that operates, a movable plunger that is sucked and operated by the core, and a cushion member that is fixed to the end portion side of the housing or the end portion side of the coil bobbin and abuts against the end portion of the movable plunger, The cushion member has a central hole through which the movable plunger is inserted, and a ring-shaped base portion held on the end portion side of the coil bobbin or the end portion side of the housing. Projected from both back surfaces of the base to both sides in the axial direction of the movable plunger, and abutted by the reciprocating motion of the movable plunger. A solenoid that is composed of a pair of shock absorbing portions that are opposite to each other and absorb the shock. 2. The solenoid according to claim 1, wherein the base portion of the cushion member has an annular groove to be held on the outer peripheral portion thereof. 3. The solenoid according to claim 1, wherein the cushion member is integrally formed of a soft elastic material together with the base portion and the pair of shock absorbing portions. 4. The pair of shock absorbing portions of the cushion member are formed into a plurality of elastic pieces extending from the outer peripheral portion in the central direction and the circumferential direction and divided by slits from each other. solenoid.