JP2005347720A - Solenoid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To permit the collision sound of a plunger to be attenuated without increasing manufacturing costs. <P>SOLUTION: A part of a plunger 5 is slid inside a sleeve 6 in an approximately hermetic state. In one end part of the sleeve 6, a plunger receiver 8 that becomes one end part of a slide region of the plunger 5 is fitted. In the outer peripheral surface of the plunger receiver 8, a first noise reduction material 10 comprising a ring-shaped elastic material attenuating the collision sound of the plunger 5 at one end part of the slide region is fitted. The first noise reduction material 10 has an annular projection part 10c pressure-welded to the sleeve 6 formed on the outer peripheral surface. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention belongs to a technical field related to a closed type solenoid in which a part of a plunger is slid inside a sleeve in a state close to sealing.

  In the closed type solenoid, a silencer made of an elastic material is provided to attenuate the impact sound at both ends of the plunger slide area, but the impact sound of the plunger is also generated by the air damper function by utilizing the sealing property of the sleeve. Attempts have been made to attenuate.

Conventionally, as a closed type solenoid having an air damper function, for example, those described below are known.
Japanese Patent Laid-Open No. 2003-318020 discloses a plunger receiver that serves as one end portion of a plunger slide area at one end portion of a sleeve, and a stopper that serves as the other end portion of the plunger slide area at the other end portion of the sleeve. The first silencer that attenuates the impact noise of the plunger at one end of the slide area is attached to the surface of the plunger that faces the plunger receiver, and the impact sound of the plunger at the other end of the slide area is attenuated to the stopper. A solenoid with a second silencer attached thereto is described.

  In the solenoid according to Patent Document 1, the air damper function is realized by adjusting a clearance between a sleeve, a plunger, a stopper, and a sound deadening material that serves as an air escape path. In addition to the solenoid according to Patent Document 1, it is also known that a packing material is provided in the air escape path to enhance the air damper function.

  The solenoid according to Patent Document 1 has a problem that the manufacturing cost is high because the number of members for damping the impact sound of the plunger is large and the structure is complicated.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a solenoid capable of attenuating the impact sound of the plunger without increasing the manufacturing cost.

  In order to solve the above-described problems, the solenoid according to the present invention employs means described in each of the claims.

  That is, according to the first aspect of the present invention, in the solenoid that slides a part of the plunger inside the sleeve in a state close to hermetic sealing, a plunger receiver serving as one end of the sliding area of the plunger is fitted to one end of the sleeve. A first silencing material made of a ring-shaped elastic material that attenuates the impact sound of the plunger at one end of the slide area is fitted to the outer circumferential surface, and the first silencing material is annularly pressed against the sleeve on the outer circumferential surface. A protruding portion is formed.

  This means eliminates the need for a packing material provided in the air escape passage, and replaces it with a protruding portion of the first silencer.

  According to a second aspect of the present invention, in the solenoid according to the first aspect of the present invention, the first silencer has an uneven structure on the collision surface of the plunger.

  In this means, the uneven structure of the first silencer effectively attenuates the impact of the plunger collision.

  According to a third aspect of the present invention, in the solenoid of the second aspect, the uneven structure of the first silencer is provided with a plurality of types as protrusion lengths of the protruding portions.

  In this means, the uneven structure of the first silencer effectively attenuates the impact of the plunger collision step by step.

  According to a fourth aspect of the present invention, in the solenoid for sliding a part of the plunger inside the sleeve in a state close to sealing, a stopper serving as the other end of the sliding area of the plunger is bent at the other end of the sleeve. A second silencer made of a ring-shaped elastic material that attenuates the impact sound of the plunger at the other end of the slide area is fitted to the outer peripheral surface.

  This means eliminates the need for a stopper as a separate member disposed at the other end of the sleeve.

  According to a fifth aspect of the present invention, in the solenoid according to the fourth aspect of the present invention, the second sound deadening material is provided with an air escape groove through which air passes on a collision surface with the stopper.

  In this means, the air relief groove of the second silencer ensures the escape of air from the inside of the sleeve.

  According to a sixth aspect of the present invention, in the solenoid according to any one of the first to fifth aspects of the present invention, in the solenoid that slides a part of the plunger inside the sleeve in a state close to sealing, one end of the sliding area of the plunger is attached to one end of the sleeve And a return coil spring that is elastically biased in the separating direction is accommodated between the plunger and the plunger receiver, and at least one of the return coil springs is closely wound with both ends increased in winding density. The small-diameter portion is continued from the large-diameter portion provided at the end portion of this through a tapered portion.

  In this means, the return coil spring is shaped to prevent the deformation of the axis line during compression.

  In the solenoid according to the first aspect of the present invention, the packing material provided in the air escape passage is not required and is replaced by the protruding portion of the first silencing material, and the number of members for damping the collision sound of the plunger is large. Since the structure can be prevented from becoming complicated, the impact sound of the plunger can be attenuated without increasing the manufacturing cost.

  Moreover, since the uneven structure of the first silencer effectively attenuates the impact of the plunger collision, the impact sound of the plunger is more reliably attenuated.

  According to the third aspect of the present invention, since the uneven structure of the first silencer effectively attenuates the impact of the plunger collision step by step, there is an effect that the collision sound of the plunger is more reliably attenuated.

  Furthermore, the solenoid according to claim 4 of the present invention does not require a stopper as a separate member disposed at the other end of the sleeve, and has a large number of members for damping the collision sound of the plunger, resulting in a complicated structure. Therefore, the impact sound of the plunger can be attenuated without increasing the manufacturing cost.

  According to a fifth aspect of the present invention, since the air escape groove of the second silencer ensures the escape of air from the inside of the sleeve, it is possible to prevent the generation of abnormal noise (air removal sound) accompanying the slide of the plunger. There is an effect that can be done.

  According to a sixth aspect of the present invention, the return coil spring is shaped to prevent deformation of the axis line during compression, and contact between the return coil spring, the plunger, and the plunger receiver is avoided when the return coil spring is compressed. Therefore, there is an effect that it is possible to prevent the return coil spring from being worn and damaged and to prevent the generation of abnormal noise (metal contact sound) accompanying the sliding of the plunger.

  Hereinafter, the best mode for carrying out a solenoid according to the present invention will be described with reference to the drawings.

  In this embodiment, a pull type that performs a pull-in operation by excitation is shown.

  In this embodiment, a bobbin 2 around which a coil 1 is wound is accommodated in a yoke 3 and fixed by a yoke cover 4. At the center of the bobbin 2, a sleeve 6 that passes through the yoke cover 4 and slides a part of the plunger 5 inside a state close to sealing is inserted and fixed.

  The plunger 5 is composed of a shaft in which a relatively large-diameter main body portion 5 a housed in the sleeve 6 and a relatively small-diameter connecting portion 5 b protruding outside the sleeve 6 are integrated. At one end of the main body 5a (opposite to the connecting portion 5b), a tapered air receiver 5c and a long hole-shaped spring housing hole 5d are continuously drilled in the axial direction. A pin 7 for connecting to necessary equipment is attached to the connecting portion 5b. An annular silencer mounting groove 5e is provided at the boundary between the main body portion 5a and the connecting portion 5b.

  The sleeve 6 has a plunger receiver 8 fitted to one end of the sliding area of the plunger 5. The plunger receiver 8 is provided with a mounting shaft 8a that is fixed to the yoke 3 by caulking or the like at one end, and a tapered head 8b that faces the air receiver 5c of the plunger 5 at the other end. A round hole-shaped spring receiving groove 8c facing the spring accommodating hole 5d of the plunger 5 is provided at the top of the ring, and an annular silencer mounting groove 8d is provided on the outer peripheral surface of the middle part.

  Further, the sleeve 6 is integrally provided at the other end with a stopper 9 serving as the other end of the sliding area of the plunger 5 by bending the end edge of the sleeve 6. Therefore, since it is not necessary to attach a separate stopper, it can be avoided that the number of members increases and the structure becomes complicated.

  The silencer mounting groove 8d of the plunger receiver 8 is fitted and attached with a first silencer 10 made of a ring-shaped elastic material that attenuates the impact sound of the plunger 5 at one end of the slide area. As shown in detail in FIG. 3 and FIG. 4, the first silencer 10 is different in the projecting lengths a and b having different projecting lengths a and b that are radially arranged on the end surface of the plunger 5 that contacts the end surface around the air receiver 5 c. A concavo-convex structure composed of different types of protrusions 10a and 10b is formed, and an annular protrusion 10c that presses against the sleeve 6 is formed on the outer peripheral surface (see an enlarged view of FIG. 1).

  The silencer mounting groove 5e of the plunger 5 is fitted with a second silencer 11 made of a ring-shaped elastic material that attenuates the impact sound of the plunger 5 at the other end of the slide area. The second silencer 11 has an outer diameter that is slightly smaller than the inner diameter of the plunger 5 and slightly larger than the inner diameter of the stopper 9, and air escape grooves 11a through which air passes radially are provided on both end faces (see FIG. 5).

  A return coil spring 12 is mounted between the plunger 5 and the plunger receiver 8. The return coil spring 12 is disposed between the spring accommodating hole 5 d of the plunger 5 and the spring receiving groove 8 c of the plunger receiver 8, and is elastically biased so as to project the connecting portion 5 b of the plunger 5 from the sleeve 6. Yes. As shown in detail in FIG. 6, the return coil spring 12 is closely wound with both ends increased in winding density, and the large-diameter portion 12 a provided at the end of the plunger 5 on the spring accommodating hole 5 d side. The small diameter portion 12c is formed in a continuous shape through the taper portion 12b.

  According to this configuration, when the plunger 5 slides in the direction of the plunger receiver 8 by excitation, the elasticity of the return coil spring 12 and the repulsive force of the air compressed between the plunger 5 and the plunger receiver 8 Functions as a resistance to reduce the slide speed. The air compressed between the plunger 5 and the plunger receiver 8 is quantitatively ensured by the presence of the air receiver 5c and the spring accommodating hole 5d of the plunger 5, and the first silencer 10 that is in pressure contact with the sleeve 6 is used. Since the protruding portion 10 c prevents unnecessary leakage from the clearance of the sleeve 6 and the plunger receiver 8, the air damper function is effectively exerted on the slide of the plunger 5. Accordingly, since the air damper function can be effectively achieved without providing any special packing material, it is possible to avoid an increase in the number of members and a complicated structure.

  Further, the plunger 5 whose slide speed has been decelerated is further decelerated by coming into contact with the protrusions 10 a and 10 b of the first silencer 10. The protrusions 10a and 10b having different protrusion lengths exhibit elasticity as resistance to the plunger 5 in a stepwise manner to effectively reduce the sliding speed of the plunger 5 and attenuate the collision sound.

  In the above-described slide of the plunger 5, the return coil spring 12 is compressed. However, because of the shape of the return coil spring 12 and the like, the deformation of the curved or twisted axis is prevented, so the spring of the plunger 5 It is possible to prevent abnormal noise (metal contact sound) from coming into contact with the accommodation hole 5d.

  When the excitation is released, the plunger 5 slides in the reverse direction due to the elastic force of the return coil spring 12. Then, when the second sound deadening material 11 comes into contact with the stopper 9, the sliding speed of the plunger 5 is reduced and the collision sound is attenuated. At this time, the second silencer 11 exerts an air damper function by suppressing the discharge of air from the stopper 9. However, since the air escape groove 11a is provided in the second silencer 11, it is possible to suppress the discharge of air more than necessary and prevent the generation of abnormal noise (air bleeding).

  As described above, in addition to the illustrated examples, it is possible to form a plurality of protrusions 10c of the first muffler 10.

1 is a cross-sectional view including a part of each of the best modes for carrying out a solenoid according to the present invention. It is another operation | movement figure of FIG. It is an enlarged view of the principal part of FIG. FIG. 4 is a plan view of FIG. 3. It is an enlarged plan view of the other principal part of FIG. It is a detailed enlarged view of the other principal part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil 2 Bobbin 3 Yoke 5 Plunger 6 Sleeve 8 Plunger receiving 9 Stopper 10 1st silencer 10a, 10b Protrusion (uneven structure)
10c Protruding part 11 Second silencer 11a Air escape groove 12 Return coil spring 12a Large diameter part 12b Taper part 12c Small diameter part

Claims (6)

  In a solenoid that slides a part of a plunger inside a sleeve in a state close to sealing, a plunger receiver that is one end of a plunger sliding area is fitted to one end of the sleeve, and one end of the sliding area is fitted to the outer peripheral surface of the plunger receiver. A first silencing material made of a ring-shaped elastic material that attenuates the impact noise of the plunger in the portion is fitted, and the first silencing material is formed with an annular ridge that presses against the sleeve on the outer peripheral surface. Solenoid characterized by being.   2. The solenoid according to claim 1, wherein the first silencer has an uneven structure on a collision surface of the plunger. 3.   3. The solenoid according to claim 2, wherein the uneven structure of the first silencer includes a plurality of types as protrusion lengths of the protruding portions.   In the solenoid that slides part of the plunger inside the sleeve in a state close to hermetic seal, a stopper that is the other end of the plunger slide area is bent at the other end of the sleeve, and the other end of the slide area is formed on the outer peripheral surface of the plunger. A solenoid, wherein a second silencer made of a ring-shaped elastic material that attenuates the impact sound of the plunger at the end is fitted.   5. The solenoid according to claim 4, wherein the second silencer is provided with an air escape groove through which air passes on a collision surface with the stopper.   The solenoid according to any one of claims 1 to 5, wherein a part of the plunger is slid inside the sleeve in a state close to sealing, and a plunger receiver serving as one end of the plunger sliding area is fitted to one end of the sleeve. And a return coil spring that is elastically biased in the separating direction is accommodated between the plunger and the plunger receiver, and the return coil spring is provided with at least one end that is closely wound with increased winding density. A solenoid having a small diameter portion continuous from a large diameter portion via a taper portion.

Images