JP2006210013A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay enabling simple and sure assemble of a surge absorbing element to hold it and surely preventing a breakage caused by a vibration, etc. <P>SOLUTION: The relay comprises a synthetic resin made bobbin 31 having a coil winding drum part 31c at the center part thereof and having a terminal mounting part 31e at the side part 31d thereof; a coil 34 which is wound around the drum part 31c of the bobbin 31 and of which the ends are connected to a pair of coil terminals 33, 33 mounted to the mounting part 31e of the bobbin 31; and a surge absorbing element 45 in which the pair of lead parts 45b are connected to a pair of coil terminals 33, 33. An element housing box 32 to house an element body 45a of the surge absorbing element 45 is integrally formed with the bobbin 31, and the pair of the lead parts 45b, 45b of the surge absorbing element 45 housed in the box 32 are pressure-contacted respectively to each pressure-contact blade 33b formed at the pair of the coil terminals 33, 33. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic relay using a surge absorbing element such as a varistor (large surge absorber) and having a fuse.

  As this type of electromagnetic relay, there are those shown in FIGS. 17 to 19 (see, for example, Patent Document 1).

  As shown in FIGS. 17 to 19, the electromagnetic relay (relay) 1 includes a connection terminal 4 and a fixed contact 5a, each of which is crimped to a yoke 3c of an electromagnet 3 in each hole 2a, 2b, 2c, 2d of the base 2. A pair of contact terminals 5A and 5B having 5b and a pair of coil terminals 6 and 6 are inserted and fixed, respectively.

  The electromagnet 3 includes a bobbin 3a, a coil 3b wound around the bobbin 3a, a yoke 3c that is assembled to the bobbin 3a to form a magnetic path, and a core 3d that is crimped to the yoke 3c. Yes. A movable contact 8 is attached to the yoke 3c via a leaf spring 7. The movable contact 8 is in contact with the fixed contact 5a of one contact terminal 5A when no excitation current is applied to the coil 3b, and when the excitation current is applied to the coil 3b, the movable contact 8 is connected to the other contact terminal 5B. It comes in contact with the fixed contact 5b.

  Further, both terminals S of the coil 3b are connected to the crimping pieces 6a of the pair of coil terminals 6 and 6 by caulking and fixing. Further, a pair of lead portions 9b, 9b of a surge absorbing element 9 such as a resistor, a surge absorber, a diode or the like is firmly connected to each slit 6b of the pair of coil terminals 6, 6 by caulking and fixing.

Japanese Patent Laid-Open No. 10-134692 (FIGS. 1 to 3)

Japanese Patent Laid-Open No. 6-12756

  However, in the conventional electromagnetic relay 1, the pair of lead portions 9 b and 9 b of the surge absorbing element 9 are connected to the slits 6 b of the pair of coil terminals 6 and 6 by caulking and fixing. In addition, the pair of lead portions 9b and 9b of the surge absorbing element 9 is spanned between the slits 6b and 6b of the pair of coil terminals 6 and 6, and the element body 9a is not held by the base 2. For this reason, when a surge absorber having a large size such as a varistor is used, the element main body 9a of the surge absorbing element 9 or each lead portion 9b may be damaged due to vibration.

  Therefore, the present invention has been made to solve the above-described problems, and can easily hold a surge absorbing element in a simple and reliable manner, and can reliably prevent damage due to vibration or the like. The purpose is to provide.

  The invention of claim 1 has a coil bobbin portion at the center and a resin bobbin having a terminal mounting portion at the side, and the coil bobbin of this resin bobbin is wound around the terminal, An electromagnetic relay comprising a coil connected to a coil terminal attached to a terminal mounting portion of the bobbin, and a surge absorbing element having a lead portion connected to the coil terminal, wherein the surge absorbing element is attached to the resin bobbin An element storage box for storing the element main body is integrally formed, and a lead portion of the surge absorbing element stored in the element storage box is press-contacted to a press contact blade formed on the coil terminal.

  The invention according to claim 2 is the electromagnetic relay according to claim 1, wherein the element storage box is formed in a rectangular tube shape, and the lead of the surge absorbing element is provided with a predetermined interval on the side wall of the element storage box. A pair of slits extending to the opening on the part side is formed to form an elastic element pressing part, and the element main body of the surge absorbing element is elastically held by the element pressing part.

  As described above, according to the first aspect of the present invention, the element storage box for storing the element main body of the surge absorption element is integrally formed on the resin bobbin, and the lead of the surge absorption element stored in the element storage box is formed. The surge absorbing element can be easily assembled in the element storage box and the lead portion of the surge absorbing element can be easily connected to the pressing contact blade of the coil terminal. . Thereby, damage to the surge absorbing element due to vibration or the like can be reliably prevented. In addition, since the element storage box for storing the element main body of the surge absorbing element is integrally formed on the resin bobbin, the storage space for the surge absorbing element can be made compact, and the entire electromagnetic relay can be miniaturized. it can.

  According to the invention of claim 2, the element storage box is formed in a rectangular tube shape, and the pair of slits reaching the opening on the lead portion side of the surge absorbing element with a predetermined interval on the side wall of the element storage box. By drilling and forming the elastic element pressing part, the surge absorbing element stored in the element storage box can be easily and reliably held by the elastic force of the element pressing part, and damage due to vibration etc. can be ensured Can be prevented.

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

  1 is a perspective view showing an electromagnetic relay according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the electromagnetic relay, FIG. 3 is a plan view of the electromagnetic relay, and FIG. 4 is a cross-section along line XX in FIG. 5 is a perspective view showing the inside of the casing of the electromagnetic relay, FIG. 6 is a cross-sectional view of the casing cut along one fuse terminal, and FIG. 7 is the casing taken along the other fuse terminal. FIG. 8 is a perspective view of the electromagnetic relay unit of the electromagnetic relay as viewed from the front side, FIG. 9 is a perspective view of the electromagnetic relay unit as viewed from the left corner, and FIG. 10 is a perspective view of the electromagnetic relay unit. FIG. 11 is a perspective view of the electromagnetic relay unit viewed from the rear side, FIG. 12 is a perspective view of the bobbin of the electromagnetic relay, FIG. 13 is a front view of the bobbin, and FIG. 15 is a plan view of the bobbin, and FIG. It is an enlarged sectional view of the device storage box.

  As shown in FIGS. 1 to 11, an electromagnetic relay (relay) 10 is a box-shaped synthetic resin casing (base) 11 having an opening 12 on the bottom surface side, and a rubber is attached to the opening 12 of the casing 11. A base cover 19 fitted through an annular sealing material 18, one fuse terminal 20 routed in a recess 13 b formed in the center of the inner surface 13 a of the ceiling wall 13 of the casing 11, The other fuse terminal 24, which is locked to a boss portion 13 c formed at one corner portion of the inner surface 13 a of the ceiling wall 13 and is arranged so as to intersect with one fuse terminal 20 with a predetermined clearance. And a cable that is locked to a boss portion 13d formed at the other corner portion of the inner surface 13a of the ceiling wall 13 of the casing 11 and is arranged in parallel with the other fuse terminal 24. Jo and load (power) terminal 29, is incorporated in the circumferential wall 19a of the base cover 19 and an electromagnetic relay unit 30 housed in the casing 11.

  As shown in FIGS. 5 to 11, one fuse terminal 20 is formed by bending an input terminal 21 on one end 20b side of the terminal body 20a and a pair of terminals 20a on the other end 20c side of the terminal body 20a. The output terminals 22, 22 are bent. The input terminal 21 protrudes into a fuse housing part (housing part) 14 that is integrally formed on the outer surface 13 e of the ceiling wall 13 of the casing 11. One of the pair of terminal portions 51, 51 of the fuse 50 is connected to the input terminal 21 protruding into the fuse housing portion 14 via the relay terminal 23. Further, the pair of output terminals 22 and 22 project into a connector housing part (housing part) 15 that is integrally formed on the outer surface 13 e of the ceiling wall 13 of the casing 11.

  As shown in FIGS. 5, 7, and 9 to 11, the other fuse terminal 24 has an input terminal 25 bent on one end 24b side of the terminal body 24a, and the other terminal body 24a. A U-shaped load (power supply) terminal 26 is bent on the end 24c side. The input terminal 25 protrudes into the fuse housing portion 14 formed integrally with the outer surface 13 e of the ceiling wall 13 of the casing 11. The input terminal 25 protruding into the fuse housing portion 14 is connected to the other of the pair of terminal portions 51, 51 of the fuse 50 via the relay terminal 23. As shown in FIGS. 2 and 4, the lower piece 26 a of the U-shaped load terminal 26 is in contact with the inner surface 13 a of the ceiling wall 13 of the casing 11 and is formed on the lower piece 26 a. A fixed contact 27 is fitted and fixed in the round hole 26b. Further, the upper piece portion 26c of the U-shaped load terminal 26 is exposed on the outer surface 13e of the ceiling wall 13 of the casing 11, and the hexagonal shape is formed on the lower surface of the round hole 26d formed in the upper piece portion 26c. The bolt 28 is fitted.

  2 to 5, the lower piece 29a of the U-shaped load terminal 29 is in contact with the inner surface 13a of the ceiling wall 13 of the casing 11 and is formed on the lower piece 29a. A fixed contact 27 is fitted and fixed in the round hole 29b. Further, the upper piece 29c of the U-shaped load terminal 29 is exposed on the outer surface 13e of the ceiling wall 13 of the casing 11, and the hexagonal shape is formed on the lower surface of the round hole 29d formed in the upper piece 29c. The bolt 28 is fitted. All of the lower piece portions 26a and 29a of the load terminals 26 and 29, the terminal body 20a constituting the input terminal 21 and the pair of output terminals 22, and the respective terminals of the coil terminal 33 to be described later are provided. The casing 11 is routed on the inner surface 13 a side of the ceiling wall 13.

  As shown in FIGS. 2 and 8 to 11, the electromagnetic relay unit 30 includes a cylindrical coil body 31 c integrally formed at the center of the upper and lower flange portions 31 a and 31 b and a block of the upper flange portion 31 a. A bobbin 31 made of synthetic resin in which a pair of terminal mounting portions 31e and 31e are integrally formed at the front portion of the side portion 31d, and a coil winding body portion 31c of the bobbin 31, and both ends are connected to the bobbin. The coil 34 connected to the electric wire crimping portion 33a of the pair of coil terminals 33, 33 attached to the pair of terminal attachment portions 31e, 31e and the recess 19b between the peripheral wall 19a of the base cover 19 are fitted. At the same time, the tip 35a is fitted into a pair of recesses 13f and 13f which are bent along the bottom surface of the bobbin 31 and formed on the inner surface 13a of the ceiling wall 13 of the casing 11. A U-shaped frame 35 to be inserted, a flange receiving plate 36 which is interposed between both side portions 35b and 35b of the frame 35, and is fitted in a central recess of the upper flange portion 31a of the bobbin 31, and a cylinder of the bobbin 31 A plunger 38 disposed in a retractable manner through a compression spring (return spring) 37, and a small-diameter upper portion 38a of the plunger 38 and a substantially center of an inner surface 13a of the ceiling wall 13 of the casing 11. And a movable plate (contactor) 41 which is interposed between the compression spring 39 interposed in the recess 13g and fixed to the movable contacts 40, 40 on both sides.

  As shown in FIG. 2, a columnar core portion 35 d protrudes from the center of the bottom portion 35 c of the U-shaped frame 35, and this core portion 35 d is formed in the cylindrical coil winding body portion 31 c of the bobbin 31. It is fitted on the lower side. A magnetic path is formed by the U-shaped frame 35 and the flange receiving plate 36 spanned between both sides 35b, 35b of the frame 35.

  As shown in FIGS. 2 and 8, the plunger 38 has a disk-shaped flange portion 38 b integrally formed between a small-diameter upper portion 38 a and a large-diameter lower portion 38 c, and the large-diameter lower portion 38 c of the plunger 38 is a bobbin 31. The cylindrical coil winding body 31c is slidably supported on the upper side. Further, the compression force (biasing force) of the return compression spring 37 is stronger than the compression force (biasing force) of the compression spring 39. Due to the difference between the urging forces of the compression springs 37 and 39, when no exciting current is applied to the coil 34, the pair of movable contacts 40 and 40 and the pair of fixed contacts 27 and 27 of the movable plate 41 are separated from each other. When an exciting current is applied to 34, the flange portion 38b of the plunger 38 is attracted to the flange receiving plate 36, the movable plate 41 moves downward, and the pair of movable contacts 40, 40 are paired with the pair of fixed contacts 27, 27. To come into contact.

  As shown in FIGS. 8 to 16, a rectangular tubular element storage box 32 is integrally formed on the block-shaped side part 31 d of the upper flange part 31 a of the bobbin 31, and the rear opening of the element storage box 32 is formed. The varistor main body (element main body) 45a of the varistor (surge absorbing element) 45 can be accommodated from the portion 32a. As shown in FIGS. 10, 12, and 13, the side wall 32 of the element storage box 32 has a pair of slits 32c reaching the front opening 32e on the lead 45b side of the varistor 45 at a predetermined interval. 32c are formed to form an elastic element pressing portion 32d, and the element pressing portion 32d elastically holds the varistor body 45a of the varistor 45. The pair of lead portions 45b and 45b of the varistor 45 exposed outside the front opening 32e of the element storage box 32 are in pressure contact with the press contact blades 33b formed integrally with the pair of coil terminals 33 and 33, respectively.

  As shown in FIGS. 1, 3, and 6, the fuse housing portion 14 of the casing 11 is formed with a spare housing recess 14a for housing the spare fuse 50 '. This spare fuse 50 'is shown only in FIGS.

  According to the electromagnetic relay 10 of the embodiment described above, the element storage box 32 for storing the varistor body 45a of the varistor 45 is integrally formed on the synthetic resin bobbin 31, and a pair of the varistors 45 stored in the element storage box 32 is formed. The lead portions 45b and 45b of the varistor 45 are pressed into contact with the press contact blades 33b formed on the pair of coil terminals 33 and 33, respectively, so that the varistor 45 can be easily assembled to the element storage box 32 and the pair of lead portions 45b of the varistor 45. 45b can be easily connected to the press contact blades 33b of the pair of coil terminals 33, 33. Thereby, damage to the varistor main body 45a and the pair of lead portions 45b, 45b of the varistor 45 due to vibration or the like can be reliably prevented. In addition, since the element storage box 32 for storing the varistor body 45a of the varistor 45 is integrally formed on the synthetic resin bobbin 31, the storage space for the varistor 45 can be made compact, and the entire electromagnetic relay 10 can be downsized. Can be planned.

  Further, a pair of slits 32c and 32c reaching the front opening 32e on the lead part 45b side of the varistor 45 with a predetermined interval are formed in the side wall 32 of the element storage box to have an elastic element holding part 32d. As a result, the varistor body 45a of the varistor 45 stored in the element storage box 32 can be easily and reliably held by the elastic force of the element pressing portion 32d, and the varistor body 45a of the varistor 45 is damaged by vibration or the like. It can be surely prevented.

  In addition, according to the said embodiment, although the varistor (large surge absorber) was used as a surge absorption element, of course, you may use other surge absorption elements, such as resistance and a diode.

It is a perspective view which shows the electromagnetic relay of one Embodiment of this invention. It is sectional drawing of the said electromagnetic relay. It is a top view of the said electromagnetic relay. It is sectional drawing which follows the XX line in FIG. It is a perspective view which shows the inside of the casing of the said electromagnetic relay. It is sectional drawing which cut | disconnected the said casing along one terminal for fuses. It is sectional drawing which cut | disconnected the said casing along the other fuse terminal. It is the perspective view which looked at the electromagnetic relay unit of the said electromagnetic relay from the front side. It is the perspective view which looked at the said electromagnetic relay unit from the left corner part side. It is the perspective view which looked at the said electromagnetic relay unit from the right side. It is the perspective view which looked at the said electromagnetic relay unit from the back side. It is a perspective view of the bobbin of the said electromagnetic relay. It is a front view of the said bobbin. It is a side view of the said bobbin. It is a top view of the said bobbin. It is an expanded sectional view of the element storage box of the bobbin. It is a perspective view of the conventional electromagnetic relay. It is a disassembled perspective view of the conventional electromagnetic relay. It is a perspective view which shows the state which assembled | attached the terminal for coils and the surge absorption element to the base of the said conventional electromagnetic relay.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnetic relay 31 Bobbin 31c Coil winding trunk | drum 31d Side part 31e Terminal attachment part 32 Element storage box 32b Side wall 32c, 32c A pair of slit 32d Element pressing part 32e Front opening part (opening part)
33 Terminal for coil 33b Pressure welding blade 34 Coil 45 Varistor (surge absorption element)
45a Varistor body (element body)
45b Lead part

Claims (2)

A coil bobbin having a coil winding body at the center and a terminal bobbin on the side and a coil bobbin of the resin bobbin are wound around the coil bobbin and the terminal is attached to the terminal mounting portion of the bobbin. In an electromagnetic relay comprising a coil connected to the attached coil terminal, and a surge absorbing element having a lead connected to the coil terminal,
An element storage box for storing the element main body of the surge absorbing element is integrally formed on the resin bobbin, and a lead blade of the surge absorbing element stored in the element storage box is formed on the press contact blade formed on the coil terminal. Electromagnetic relay characterized by being in pressure contact. The electromagnetic relay according to claim 1,
The element storage box is formed in a rectangular tube shape, and a pair of slits reaching the opening on the lead part side of the surge absorbing element are formed in the side wall of the element storage box with a predetermined interval, thereby having elasticity. An electromagnetic relay, wherein an element pressing portion is formed, and the element main body of the surge absorbing element is elastically held by the element pressing portion.

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