JP2003318020A - Solenoid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To build a structural part, which is to be provided around a solenoid, in the solenoid itself, to shorten the projection of a plunger so as to save the space, and to reduce an operating sound made by the impact of a plunger of the solenoid when the plunger is attracted or reset. <P>SOLUTION: The solenoid is equipped with a bobbin pipe arranged inside a bobbin wound with a coil, the plunger which slides in the bobbin pipe and is attracted into the coil when an electric power is applied to the coil, a spring which energizes the plunger in the direction opposite to the coil when the electric power is stopped, and a stopper which determines the sliding range of the plunger when no electric current is applied to the coil. The stopper is fitted to the bobbin pipe as a pawl provided to the stopper is engaged with a curled part provided to the bobbin pipe by bending its one end inward so as to extend outward. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a technical field relating to a solenoid having a stopper that determines a sliding range of a plunger of a solenoid and a function of reducing the operating noise of the plunger.

[0002]

2. Description of the Related Art In a conventional solenoid, a stopper mechanism that determines the sliding range of the plunger, a structure for reducing the operating noise by suction and a recovery operation, a structure for preventing foreign matter such as dust from entering the sliding part of the plunger, a plunger A return mechanism using a spring to restore the solenoid was attached to the outside of the solenoid.

[0003]

In the above-mentioned conventional solenoid, since the stopper mechanism that determines the sliding range of the plunger is attached to the outside of the solenoid,
There is a problem that the number of parts is increased and the installation space of the solenoid is increased.

Particularly, in the conventional solenoid, since the protrusion of the plunger at the time of restoration is long, a mounting space particularly in the longitudinal direction is required, and it is difficult to save space.

Further, in a solenoid having a long operation stroke of the plunger, a cushioning material (rubber or the like) is used in order to reduce an operating noise due to an impact when the plunger reaches a holding position when the plunger is attracted and restored. Although it was mounted as a washer or a cylinder, it was difficult to obtain a sufficient noise reduction effect.

Further, in the above-mentioned conventional solenoid, it is difficult to sufficiently prevent the malfunction of the plunger due to the entry of foreign matter such as dust into the sliding portion of the plunger.

The present invention is intended to solve the problems of such a conventional solenoid, in which a mechanical portion normally formed around the solenoid is incorporated into the solenoid, and the protrusion of the plunger is shortened. It saves space and reduces the operating noise at the time of impact due to plunger suction and recovery.

[0008]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the solenoid according to the present invention employs the following means.

That is, in claim 1, a bobbin pipe arranged inside a bobbin around which a coil is wound, a plunger that slides in the bobbin pipe and is attracted into the coil when the coil is energized, and a coil Is equipped with a spring that urges the plunger away from the coil when the coil is de-energized, and a stopper that determines the sliding range of the plunger when the coil is de-energized.The stopper holds one end of the bobbin pipe inside. It is characterized in that the bent curl portion is engaged with the claw portion provided on the stopper so as to come out to the outside, and is attached to the bobbin pipe. With this means, in order to incorporate the stopper 1 that determines the sliding range A of the plunger 4 inside the solenoid, the claw portion 1D of the stopper is engaged with the curl portion C in which one end of the bobbin pipe 3 is bent inward. Since it is not necessary to provide a stopper outside the solenoid, the number of parts can be reduced and the installation space for the solenoid can be reduced.

According to a second aspect of the present invention, in the solenoid according to the first aspect, the stopper is shaped to seal one end of the bobbin pipe. By this means,
The stopper 1 that determines the sliding range A of the plunger 4 serves as a lid of the bobbin pipe 3, and the bobbin pipe 3
Since a structure in which foreign matter such as dust is not mixed in is prevented, malfunction of the plunger 4 can be prevented.

According to a third aspect of the present invention, in the solenoid according to the first or second aspect, a muffling rubber that absorbs a shock between the plunger and the plunger receiver that is attracted into the coil when the coil is energized is provided. It is characterized in that a groove is formed on the surface on the side of the plunger and the air in the groove is confined between the plunger and the air damper. In this means, a silencer 5 is provided between the plunger 4 and the plunger receiver 6 when the plunger 4 is sucked into the coil by energizing the coil, and a groove K is formed on the surface of the silencer 5 on the plunger side. However, by confining the air in this groove with the plunger, it acts as an air damper, so that it is possible to efficiently absorb the shock and reduce the operating noise generated at the time of the shock.

According to a fourth aspect of the present invention, in the solenoid according to any one of the first to third aspects, the spring is in close contact with a guide bar provided integrally with the plunger, with one end of the spring being closer than the other portion. It is characterized in that it is attached by winding and the other end of the spring is expanded. With this means, the guide bar 8 provided integrally with the plunger 4 is closely spaced so that the spring 7 that returns the plunger 4 sucked into the coil to the origin when the coil is energized is not bent inward or outward. Since it is attached by tightly winding and the other end of the spring 7 is expanded,
It is possible to prevent the spring 7 from bending outward or inward, and the end of the spring 7 is caught in the gap between the silencer 5 and the plunger receiver 6 or the gap between the guide bar 8 and the plunger receiver 6. You can avoid it. In addition, the close-wound winding also determines the directionality when the spring is assembled, improving the workability of the assembly.

According to a fifth aspect of the present invention, in the solenoid according to any one of the first to fourth aspects, a ring made of a magnetic material is provided between the bobbin and the yoke lid that covers the end face of the bobbin around which the coil is wound. Characterize. In this means, since the ring 9 made of a magnetic material is provided between the yoke lid 10 and the bobbin, the bobbin pipe 3 and the plunger 4 can be shortened, and the protrusion from the yoke lid 10 can be reduced. be able to. As a result, the total length of the solenoid can be shortened, and space can be saved when mounting the solenoid.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the structure of a solenoid according to the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of a solenoid according to the present invention.

One end of the bobbin pipe 3 is a curl portion C that is bent inward, and the other end is a curl portion B that is bent outward. The stopper is attached to the bobbin pipe by engaging the curl portion C so that the portion 1D is exposed to the outside. The stopper 1 is shaped to seal one end of the bobbin pipe 3. A plunger 4 is slidably inserted into the bobbin pipe 3, and a plunger receiver 6 is fixed to a yoke 11 at the other end of the bobbin pipe 3. A guide bar 8 is integrally attached to the plunger 4, and the guide bar 8 is slidably inserted into the plunger receiver 6. A sound deadening rubber 5 is attached to the back of the plunger 4 at an angle. A space is formed between the plunger receiver 6 and the guide bar 8, and a spring 7 is provided in the space so as to bias the plunger 4 toward the stopper 1. The spring 7 is attached to the guide bar 8 by tight winding with a close spacing, and the other end of the spring 7 is expanded in diameter and engaged with the end of the space of the plunger receiver 6.

The above-mentioned stopper 1 is attached to the curl portion C of the bobbin pipe 3 to determine the sliding range A of the plunger 4 when the coil is de-energized. Since the stopper 1 has a shape that seals one end of the bobbin pipe 3, the stopper 1 serves as a lid of the bobbin pipe 3, and foreign matter does not mix into the bobbin pipe 3, so that the plunger 4 malfunctions. Can be prevented.

A muffling rubber 5 is provided to absorb a shock between the plunger 4 and the plunger receiver 6 when the plunger 4 is sucked into the coil by energizing the coil. As shown in FIG. 4, a cross-shaped groove K is provided on one surface of the sound deadening rubber 5, and since the surface provided with the groove is attached to the plunger 4 side, the air in the groove K can be removed. Since it is confined between 4 and 4 and acts as an air damper, it is possible to efficiently absorb the impact and reduce the operating noise generated at the time of the impact. Further, since the rubber washer 2 is attached to the stopper 1, when the coil is de-energized, the biasing force of the spring 7 is applied to the stopper 1.
It is possible to reduce the impact with the stopper 1 when the plunger 4 slides above the. Since the end of the bobbin pipe 3 is sealed by the stopper 1, when the coil is de-energized, the escape of air between the plunger 4 and the stopper 1 is delayed, so that the plunger 4 can be restored. Since it is slightly delayed, the impact with the stopper 1 is further reduced, and the sound reduction effect can be enhanced.

Further, the rubber washer 2 described above is provided with a large number of triangular cone-shaped projections on both sides in order to enhance the sound reduction effect.

The end of the spring 7 is widened (see FIG. 3) and the other end (opposite side) is opened so that the winding of the spring 7 that returns the plunger 4 sucked into the coil to the origin does not bend inward or outward. The close-wound m (see FIG. 3) having a close interval can make the close-wound portion hard and prevent the spring 7 from bending outward or inward.
Further, the end of the spring 7 is not caught between the silencer 5 and the plunger receiver 6 or between the silencer 5 and the guide bar 8. Further, since the end portion on the opposite side of the spring 7 is widened, even when the plunger 4 is sucked into the coil and the spring 7 is compressed, the end portion of the spring 7 is placed in the gap between the guide bar 8 and the plunger receiver 6. Does not bite.

As shown in FIG. 2, the coil wound around the bobbin is arranged outside the bobbin pipe 3,
Further, the outer side thereof is covered with a yoke 11, and the yoke 1
The end surface of the coil exposed at the opening 1 is covered with a yoke lid 10. A ring 9 made of a magnetic material is provided between the yoke lid 10 and the bobbin.

FIG. 6 shows an example in which a ring made of a magnetic material is not provided. If the ring made of a magnetic material is not provided, the magnetic path (arrow) is formed as shown, so that the yoke lid is formed. Further, the plunger 4 cannot be pushed further deeply, and as a result, the plunger 4 and the bobbin pipe cannot be shortened, so that the total length of the solenoid becomes long. On the other hand, when the ring 9 made of a magnetic material is provided as shown in FIG. 5, the magnetic path (arrow) is also formed in the ring 9, so that the plunger 4 can be dug deeper accordingly. The jar 4 and the bobbin pipe can be shortened, and the protrusion of the bobbin pipe portion from the yoke lid can be reduced.

[0022]

As described above, with the structure of the solenoid according to the present invention, the following effects can be obtained.

According to the first aspect of the invention, since the stopper 1 for determining the sliding range A of the plunger 4 is incorporated inside the solenoid, it is not necessary to provide a stopper outside the solenoid, the number of parts can be reduced, and the mounting space for the solenoid can be reduced. Can be made smaller. In addition, since the bobbin pipe 3 is an inwardly curled portion, and the claws of the stopper 1 are assembled from the inside so that they come out to the outside and are engaged with the curled portion, it is sufficient for the impact when the plunger 4 returns. Can withstand.

According to the second aspect, the stopper 1 serves as a lid for the bobbin pipe 3, and foreign matter such as dust is not mixed into the bobbin pipe 3, so that the plunger 4 is prevented from malfunctioning. can do. Moreover, since the end of the bobbin pipe 3 is sealed by the stopper 1,
Air bleeding in the operating portion of the plunger 4 is delayed, and the impact when the plunger 4 returns is reduced, which has a sound reducing effect.

According to claim 3, when the plunger 4 is sucked into the coil by energization of the coil, the groove K of the muffling rubber 5 is obtained.
Since the air trapped inside functions as an air damper, it is possible to efficiently absorb the shock and reduce the operating noise generated at the time of the shock.

According to the fourth aspect, since one end of the spring 7 is closely wound with a close spacing, the spring 7 can be firmly attached to the guide bar 8 and can be prevented from bending outward or inward. It is possible to prevent the end portion from being caught in a gap between the rubber 5 and the plunger receiver 6 or a gap between the noise reduction rubber 5 and the guide bar 8. Further, since the other end of the spring 7 is expanded, it is possible to prevent the end portion of the spring 7 from being caught in the gap between the guide bar 8 and the plunger receiver 6.

According to the fifth aspect, since the ring 9 made of a magnetic material is provided between the yoke lid 10 and the bobbin,
The bobbin pipe 3 and the plunger 4 can be shortened, and the protrusion of the yoke lid 10 of the bobbin pipe 3 can be reduced. As a result, the total length of the solenoid can be shortened, and space can be saved when mounting the solenoid.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a portion around a plunger of a solenoid according to the present invention.

FIG. 2 is a configuration diagram showing an example of a solenoid in which a coil, a yoke, a yoke lid, and the like are incorporated in a portion around the plunger shown in FIG.

FIG. 3 is a diagram showing a spring of a solenoid according to the present invention.

FIG. 4 is a view showing a muffler rubber of a solenoid according to the present invention.

FIG. 5 is a diagram showing a magnetic path of a solenoid provided with a ring made of a magnetic material according to the present invention.

FIG. 6 is a diagram showing a magnetic path of a solenoid in which a ring made of a magnetic material is not provided.

[Explanation of symbols]

1 stopper 2 rubber washers 3 Bobbin pipes 4 Plunger 5 silencer 6 Plunger receiver 7 spring 8 Guide bar 9 ring 10 York lid 11 York A sliding range B Curl part bent to outside of bobbin pipe C Curl part bent inside the bobbin pipe m closely wound n Expanding winding 1D stopper claw

Claims (5)

[Claims] 1. A bobbin pipe arranged inside a bobbin around which a coil is wound, a plunger that slides inside the bobbin pipe and is attracted into the coil when the coil is energized, and a plan when the coil is de-energized. It is equipped with a spring that biases the jar away from the coil, and a stopper that determines the sliding range of the plunger when the coil is de-energized.The stopper is a curl part that bends one end of the bobbin pipe inward. A solenoid characterized in that a claw portion provided on a stopper is attached to a bobbin pipe so as to be engaged with the claw portion so as to come out. 2. The solenoid according to claim 1, wherein the stopper is shaped to seal one end of the bobbin pipe. 3. The solenoid according to claim 1 or 2, wherein a silencer is provided for cushioning a shock between the plunger and the plunger receiver that are attracted into the coil when the coil is energized, and the silencer has a plunger side. A solenoid characterized in that a groove is formed on the surface of the and the air in the groove is confined between the plunger and the air damper to form an air damper. 4. The solenoid according to any one of claims 1 to 3, wherein the spring is attached to a guide bar integrally formed with a plunger by closely winding one end of the spring closer than the other portion. The solenoid is characterized in that the other end of the spring is expanded. 5. The solenoid according to claim 1, further comprising a ring made of a magnetic material between a bobbin and a yoke lid that covers an end surface of the bobbin around which the coil is wound. solenoid.