JP2008084542A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay with improved assembling workability of a compression coil spring and capable of eliminating operational failures. <P>SOLUTION: In the electromagnetic relay 10 provided with a casing 11 with a fixed contact 16 fixed to a fixed contact housing part 13 and with a movable contact 17 in and out of contact with the fixed contact 16 in free movement; a bobbin 21 housed in the casing with coils 22 wound around a cylindrical coil-winding body part 21c; a plunger 26 housed in the coil-winding body part for moving the movable contact; and a compression coil spring 18 housed in a spring housing part 15, formed into a concave shape, at a position facing the movable contact of the casing for pressing the movable contact onto the fixed contact, a striking part 14b for the movable contact to abut against is formed at an opening end 15b of an opening 15a of the spring housing part, and the spring housing part is formed into a cone, concave shape tapering down, as going rearward from the opening end of the opening. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plunger-type electromagnetic relay.

  An example of this type of electromagnetic relay is shown in FIG. 2 (see, for example, Patent Document 1).

  As shown in FIG. 2, the electromagnetic relay 1, as shown in FIG. 2, fastens and fixes a fixed contact 4 to a first step portion 3 a of a contact housing portion 3 having a concave step formed at a predetermined position inside the electromagnetic relay 1. A box-shaped casing 2 in which the movable contact 5 that contacts and separates from the first stepped portion 3a and the second stepped portion 3b of the contact storing portion 3 is disposed between the first stepped portion 3a and the second stepped portion 3b through a slider 5A. A bobbin 6 which is housed in the casing 2 and has a coil 6b wound around a central cylindrical coil winding body 6a, and a plunger which is housed in the coil winding body 6a of the bobbin 6 and moves the movable contact 5. 7 and a first compression coil that is housed in a spring housing 3c formed in a concave shape at a position facing the movable contact 5 of the casing 2 and presses and urges the movable contact 5 to the fixed contact 4 via a slider 5A. Spring 8 and plunger 7 And a second compression coil spring 9 for pressing biased in a direction to protrude from the coil winding body 6a of the bobbin 6.

  The elastic force of the second compression coil spring 9 is stronger than the elastic force of the first compression coil spring 8, and when no excitation current is applied to the coil 6b, the second compression coil spring 9 The movable contact 5 is separated from the fixed contact 4 by the urging force. When an exciting current is applied to the coil 6 b, the plunger 7 is attracted and moved downward against the elastic force of the second compression coil spring 9, and the movable contact is caused by the urging force of the first compression coil spring 8. 5 moves downward via the slider 5 </ b> A, and the movable contact 5 comes into contact with the fixed contact 4.

Japanese Utility Model Publication No. 5-73836

  However, in the conventional electromagnetic relay 1, the movable contact 5 and the compression coil spring 8 are disposed between the fixed contact 4 and the spring accommodating portion 3 c because of its structure. The movable contact 5 and the fixed contact 4 are simultaneously disposed on the storage portion 3c, and the fixed contact 4 is fixed to the casing 2 by caulking. At this time, the compression coil spring 8, the movable contact 5 and the fixed contact 4 are assembled from the opening side of the casing 2 so as not to drop off. Therefore, when the compression coil spring 8 is assembled to the spring accommodating portion 3c of the casing 2, the compression coil spring 8 is easily caught on the second step portion 3b of the contact accommodating portion 3 of the casing 2, and the assembling workability is poor. Further, if the compression coil spring 8 is assembled in a state where the compression coil spring 8 is hooked on the second stepped portion 3b of the contact housing portion 3 of the casing 2, there is a risk of malfunction.

  Accordingly, the present invention has been made to solve the above-described problems, and can improve the workability of assembling the compression coil spring into the spring housing portion and can always obtain a good operating state. The purpose is to provide a relay.

  According to the first aspect of the present invention, there is provided a casing in which a fixed contact is fixed to a contact accommodating portion formed at a predetermined position in the interior, and a movable contact that contacts and separates from the fixed contact is movably disposed. A bobbin that is housed and has a coil wound around a central cylindrical coil body, a plunger that is housed in the coil body of the bobbin and moves the movable contact, and is opposed to the movable contact of the casing. An electromagnetic relay comprising a compression coil spring that is housed in a spring housing portion that is formed in a concave shape at a position and presses and urges the movable contact against the fixed contact, and is movable at the opening end of the opening of the spring housing portion. An abutting portion with which the contact abuts is formed, and the spring housing portion is formed in a conical concave shape whose diameter decreases from the opening end of the opening. The features.

  A second aspect of the present invention is the electromagnetic relay according to the first aspect, wherein the compression coil spring is formed in an inverted conical shape whose diameter increases toward the back of the conical concave spring housing portion. .

  As described above, according to the first aspect of the present invention, the abutting portion with which the movable contact abuts is formed at the opening end of the opening portion of the spring accommodating portion of the casing, and the spring accommodating portion is formed at the opening end of the opening portion. In the process of fixing the fixed contact to the casing by arranging the compression coil spring, movable contact and fixed contact on the casing when assembling the electromagnetic relay by forming the conical concave shape whose diameter becomes smaller as going deeper The compression coil spring can be easily stored in the spring storage portion of the casing without being caught by the abutting portion of the opening end of the opening of the spring storage portion of the casing. Thereby, the assembly workability | operativity of a compression coil spring can be improved, and a favorable operating state can be obtained.

  According to the second aspect of the present invention, the compression coil spring is formed in an inverted conical shape whose diameter increases toward the back of the conical concave spring accommodating portion of the casing, so that the opening end of the opening portion of the spring accommodating portion of the casing is formed. Since the compression coil spring can be easily stored in the conical concave spring storage portion of the casing in a state in which the abutting portion and the compression coil spring are further separated from each other, the movable contact can be surely disposed at an appropriate position. it can. As a result, the compression coil spring is caught on the abutting portion of the casing, and the position of the lower end thereof is not shifted during assembly, and the assembly workability of the compression coil spring can be further improved, and a good operating state is achieved. Can always get.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing an electromagnetic relay according to an embodiment of the present invention.

  As shown in FIG. 1, the electromagnetic relay 10 is a box-shaped synthetic resin casing (base) 11 having an opening 11 a on the bottom surface side, and an unillustrated rubber annular ring in the opening 11 a of the casing 11. A base cover 19 fitted through a sealing material, and an electromagnetic solenoid unit 20 housed in a box-shaped casing 11.

  The ceiling wall 12 of the casing 11 is formed thick, and a fixed contact storage part (contact storage part) 13, a movable contact storage part (contact storage part) 14, and a spring storage part in the center of the lower surface 12 a from the bottom. 15 are each formed in a circular step concave shape. A disk-shaped fixed contact 16 is fixed by caulking to the upper surface 13 a of the fixed contact storage portion 13 of the casing 11. In addition, a substantially cylindrical movable contact 17 having a disk-shaped flange portion 17b is accommodated in the movable contact accommodating portion 14 of the casing 11 so as to be movable in the vertical direction. Further, a compression coil spring 18 that presses and urges the movable contact 17 toward the fixed contact 16 is accommodated in the spring accommodating portion 15 of the casing 11. The lower portion of the cylindrical portion 17a of the movable contact 17 passes through the hole 16a at the center of the annular annular fixed contact 16.

  Further, the periphery of the upper end 14a of the movable contact accommodating portion 14 of the casing 11 on the opening end 15b side of the opening 15a of the spring accommodating portion 15 is an abutting portion 14b with which the flange portion 17b of the movable contact 17 abuts. Furthermore, the spring accommodating portion 15 has a conical concave shape whose diameter decreases from the opening end 15b of the opening 15a toward the upper surface 15c. That is, the peripheral surface 15d of the spring storage portion 15 is formed in a conical shape.

  Further, the compression coil spring 18 is formed in an inverted conical shape having a diameter that increases toward the back of the conical concave spring housing portion 15. The upper end portion 18 a of the compression coil spring 18 is in contact with the boundary portion between the upper surface 15 c and the peripheral surface 15 d of the conical concave spring storage portion 15, and the lower end portion 18 b of the compression coil spring 18 is the flange of the movable contact 17. The ring-shaped recessed part 17c formed in the part 17b and the upper boundary part of the cylindrical part 17a are in contact. As a result, the movable contact 17 is disposed at an appropriate position.

  The electromagnetic solenoid unit 20 is wound around a synthetic resin bobbin 21 in which a cylindrical coil body 21c is integrally formed at the center of the upper and lower flange portions 21a and 21b, and the coil body 21c of the bobbin 21. A coil 22 and a metal U-shaped frame 23 that is bent along the bottom surface of the bobbin 21 and has a tip 23a fitted in a pair of recesses 12b and 12b formed on the lower surface 12a of the ceiling wall 12 of the casing 11. And a metal flange receiving plate 24 that is interposed between both side portions 23b and 23b of the frame 23 and is fitted in the central recess of the upper flange portion 21a of the bobbin 21, and a cylindrical coil winding body of the bobbin 21. It is comprised with the plunger 26 made from a magnetic body arrange | positioned freely in the part 21c via the compression coil spring (return spring) 25. As shown in FIG. To have.

  A columnar protrusion 21 d is provided on the lower flange portion 21 b of the bobbin 21, and the protrusion 21 d is fitted into a circular hole 23 d formed on the bottom 23 c of the U-shaped frame 23. A magnetic path is formed by the U-shaped frame 23 and the flange receiving plate 24 spanned between both side portions 23b, 23b of the frame 23.

  The plunger 26 is integrally formed with a disk-shaped flange portion 26 a, a large-diameter upper portion 26 b, and a small-diameter lower portion 26 c. The large-diameter upper portion 26 b of the plunger 26 is an upper side in the cylindrical coil winding portion 21 c of the bobbin 21. It is slidably supported by. A compression coil spring 25 interposed between the large diameter upper portion 26 b of the plunger 26 and the bottom portion 23 c of the U-shaped frame 23 is inserted into the small diameter lower portion 26 c of the plunger 26. Further, the compression force (elastic urging force) of the compression coil spring 25 is stronger than the compression force (elastic urging force) of the compression coil spring 18. Due to the difference between the elastic biasing forces of the compression coil springs 18 and 25, when the excitation current is not applied to the coil 22, the fixed contact 16 and the movable contact 17 are separated from each other, and when the excitation current is applied to the coil 22. The plunger 26 moves downward against the elastic urging force of the compression coil spring 25 by the bottom of the small-diameter lower portion 26c of the plunger 26 being adsorbed to the bottom 23c of the frame 23, and the movable contact 17 is also moved accordingly. Moving downward, the movable contact 17 comes into contact with the fixed contact 16.

  According to the electromagnetic relay 10 of the embodiment described above, the abutting portion 14b with which the movable contact 17 abuts the opening end 15b of the opening 15a of the spring accommodating portion 15 of the casing 11 is formed, and the spring accommodating portion 15 is opened. When the electromagnetic relay 10 is assembled, the compression coil spring 18, the movable contact 17, and the fixed contact 16 are arranged and fixed to the casing 11 when the electromagnetic relay 10 is assembled. In the step of caulking and fixing the contact 16 to the casing 11, the compression coil spring 18 is not caught in the abutting portion 14 b of the opening end 15 b of the opening 15 a of the spring accommodating portion 15 of the casing 11 in the spring accommodating portion 15 of the casing 11. Can be stored easily. Thereby, the assembly workability | operativity of the compression coil spring 18 can be improved, and a favorable operating state can be obtained.

  In particular, the compression coil spring 18 is formed in an inverted conical shape having a diameter that increases toward the back of the conical concave spring accommodating portion 15 of the casing 11, thereby opening the opening end 15 b of the opening 15 a of the spring accommodating portion 15 of the casing 11. Since the compression coil spring 18 can be easily accommodated in the conical concave spring accommodating portion 15 of the casing 11 with the abutting portion 14b and the compression coil spring 8 being further separated from each other, the movable contact 17 can be appropriately secured. Can be placed at any position. Thereby, the compression coil spring 18 is caught on the abutting portion 14b of the casing 11, and the position of the lower end portion 18b is not shifted during the assembly, and the assembly workability of the compression coil spring 18 can be further improved. A good operating state can always be obtained.

  Further, in the assembled state shown in FIG. 1 (the state in which no excitation current is applied to the coil 22 of the bobbin 21 of the electromagnetic solenoid unit 20), the elastic biasing force of the compression coil spring 25 is greater than the elastic biasing force of the compression coil spring 18. Therefore, the movable contact 17 is pushed upward by the flange portion 26 a of the plunger 26, and the flange portion 17 b of the movable contact 17 is in contact with the abutting portion 14 b of the upper surface 14 a of the movable contact accommodating portion 14 of the casing 11. . That is, the movable contact 17 is separated from the fixed contact 16.

  When an exciting current is applied to the coil 22 of the bobbin 21, the coil 22 is excited, so that a magnetic flux passing through the U-shaped frame 23, the flange receiving plate 24, and the plunger 26 is generated, and the plunger 26 is compressed. The flange 25 a of the plunger 26 is attracted to the flange receiving plate 24 by being suctioned and moved downward against the elastic biasing force of the spring 25. As a result, the bottom of the small-diameter lower portion 26 c of the plunger 26 is adsorbed to the bottom 23 c of the frame 23, so that the plunger 26 moves downward against the elastic biasing force of the compression coil spring 25. Also moves downward, and the movable contact 17 contacts the fixed contact 16.

It is sectional drawing which shows the electromagnetic relay of one Embodiment of this invention. It is sectional drawing of the conventional electromagnetic relay.

Explanation of symbols

10 Electromagnetic Relay 11 Casing 13 Fixed Contact Storage (Contact Storage)
14 Movable contact storage (contact storage)
14b Abutting portion 15 Conical concave spring accommodating portion 15a Opening portion 15b Open end 16 Fixed contact 17 Movable contact 18 Reverse conical compression coil spring 21 Bobbin 21c Coil winding body 22 Coil 26 Plunger

Claims (2)

A fixed contact is fixed to a contact housing portion formed at a predetermined position inside the casing, and a movable contact that contacts and separates from the fixed contact is movably disposed, and the casing is accommodated in the central cylindrical shape. A bobbin having a coil wound around the coil winding body, a plunger housed in the coil winding body of the bobbin and moving the movable contact, and a concave shape formed at a position facing the movable contact of the casing. In an electromagnetic relay comprising a compression coil spring housed in a spring housing portion and pressing and urging the movable contact against the fixed contact,
An abutting portion with which the movable contact abuts is formed at the opening end of the opening portion of the spring housing portion, and the spring housing portion is formed in a conical concave shape whose diameter decreases toward the back from the opening end of the opening portion. Electromagnetic relay characterized by that. The electromagnetic relay according to claim 1,
2. The electromagnetic relay according to claim 1, wherein the compression coil spring is formed in an inverted conical shape having a diameter that increases toward the back of the conical concave spring housing portion.

Images