JP4697575B2 - solenoid - Google Patents

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.
JP-A-2003-318020 In Patent Document 1, a plunger receiver serving as one end of a plunger sliding area is disposed at one end of a sleeve, and a stopper serving as the other end of the plunger sliding area is disposed at the other end of the sleeve. A first silencer that attenuates the impact noise of the plunger at one end of the slide area is attached to the surface facing the receiver, and a second silencer that attenuates the impact noise of the plunger at the other end of the slide area is attached to the stopper. The attached solenoid 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-mentioned problems, the solenoid according to the present invention employs the means described in claim 1 of the claims .

That is, in the solenoid that slides a part of the plunger inside the sleeve in a state close to sealing, the plunger has a relatively large diameter main body portion accommodated inside the sleeve and a relatively small diameter protruding outside the sleeve. It is composed of a shaft integrated with the connecting part, and one end of the main body part is continuously connected with a taper-shaped air receiver that guarantees the quantity of compressed air and a long hole-shaped spring housing hole. The plunger receiver, which is dug in the axial direction and is fitted to one end of the sleeve and becomes one end of the slide area of the plunger, is provided with a tapered head facing the air receiver of the plunger at the other end. A round hole-shaped spring receiving groove facing the spring accommodating hole of the plunger is provided on the top of the head, and an annular silencer mounting groove is provided on the outer peripheral surface of the middle part. Between the spring receiving groove of the jar receiver, the large diameter portion provided at the end on the spring receiving hole side is formed into a shape in which the small diameter portion is continuous through the taper portion, and the plunger is protruded from the sleeve. An energizing return coil spring is provided, and the silencer mounting groove of the plunger receiver is made of a ring-shaped elastic material that attenuates the impact sound of the plunger at one end of the slide area, and is provided on the end surface around the plunger air receiver. A first silencing material in which an uneven structure composed of a plurality of types of protrusions with different protrusion lengths arranged radially is formed on an abutting end surface and an annular ridge that presses against the sleeve is formed on the outer peripheral surface is fitted. It is installed .

  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.

The solenoid according to the present invention eliminates the need for a packing material provided in the air escape passage, is replaced by a ridge portion of the first silencer, has a large number of members for damping the impact sound of the plunger, and has a complicated structure. Therefore, the impact sound of the plunger can be attenuated without increasing the manufacturing cost.

  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 and attached 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.

DESCRIPTION OF SYMBOLS 1 Coil 2 Bobbin 3 Yoke 5 Plunger 6 Sleeve 8 Plunger receptacle 9 Stopper 10 1st silencer 10a, 10b Protrusion (uneven structure)
10c ridge 11 second silencer 11a air escape groove 12 return coil spring 12a large diameter portion 12b taper portion 12c small diameter portion

Claims (1)

In a solenoid that slides a part of the plunger inside the sleeve in a state close to sealing, the plunger is connected to a relatively large diameter main body portion accommodated in the sleeve and a relatively small diameter projecting to the outside of the sleeve. It is composed of a shaft integrated with the part, and at one end of the main body part, there is a continuous taper-shaped air receiver that guarantees the quantity of compressed air and a long hole-shaped spring housing hole. The plunger receiver that is dug in the axial direction and is fitted to one end of the sleeve to become one end of the slide area of the plunger is provided with a tapered head facing the plunger air receiver at the other end. A round hole-shaped spring receiving groove facing the spring accommodating hole of the plunger is provided on the top of the ring, and an annular silencer mounting groove is provided on the outer peripheral surface of the middle part. Between the spring receiving groove and the large diameter portion provided at the end on the spring receiving hole side, and the small diameter portion is formed continuously from the large diameter portion via the taper portion so that the plunger protrudes from the sleeve. A return coil spring is disposed, and the silencer mounting groove of the plunger receiver is made of a ring-shaped elastic material that attenuates the impact sound of the plunger at one end of the slide area, and abuts on the end surface around the plunger air receiver. A first silencing material is formed by fitting and mounting a concavo-convex structure formed of a plurality of types of protrusions having different projecting lengths arranged radially on the end surface, and having an annular ridge formed on the outer peripheral surface to be pressed against the sleeve. solenoid, characterized by that.

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