JP4772521B2 - Electromagnetic relay - Google Patents

Description

  The present invention relates to a plunger-type electromagnetic relay provided with a surge absorbing element such as a diode, a resistor, and a surge absorber for absorbing a surge voltage generated in the coil by turning on / off the current to the coil.

  An example of this type of electromagnetic relay is shown in FIG. 13 (see, for example, Patent Document 1).

  As shown in FIG. 13, this electromagnetic relay has a resin bobbin 1 in which a coil 2 is wound around a central coil winding body 1a. A pair of terminal mounting pieces 3 and 3 project from both sides of the upper flange portion 1b of the bobbin 1, and an element storage box 4 projects from the middle position. Coil terminals 5 connected to both ends of the coil 2 are attached to the pair of terminal attachment pieces 3, 3.

  In the element housing box 4 of the bobbin 1, a surge absorbing element 6 that absorbs a surge voltage generated in the coil 2 is accommodated, and the pair of lead portions 7 and 7 of the surge absorbing element 6 are connected to a pair of coil terminals. 5 and 5 are connected to each other.

Japanese Utility Model Publication No. 64-20649

  However, in the conventional electromagnetic relay, the element housing box 4 for housing the pair of terminal mounting pieces 3 and 3 for attaching the coil terminal 5 to the outer edge of the upper flange portion 1b of the bobbin 1 and the surge absorbing element 6 is large outward. Since the projecting portion protrudes so as to protrude, the distributor main body becomes large, and the workability of assembling work such as the arrangement and wiring of the pair of coil terminals 5 and 5 and the surge absorbing element 6 is poor.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a small electromagnetic relay capable of easily and reliably arranging and assembling a pair of coil terminals and a surge absorbing element. And

  The invention of claim 1 has a coil bobbin portion at the center and a resin bobbin having a terminal mounting portion at the flange portion, and is wound around the coil bobbin portion of the resin bobbin. In the electromagnetic relay, comprising: a coil connected to a pair of coil terminals attached to a terminal attachment portion of the bobbin; and a surge absorbing element connected to a pair of lead portions connected to the pair of coil terminals. The mounting wall of the terminal mounting portion is provided upright on the flange portion of the made bobbin, and the terminal holding portions for holding the pair of coil terminals are provided on both the left and right sides of the mounting wall, and the center of the mounting wall is provided. An intermediate terminal holding portion for holding the intermediate terminal, and holding the pair of coil terminals in the left and right terminal holding portions, respectively, and holding the intermediate terminal in the intermediate terminal holding portion. To one, characterized in that a pair of surge absorbing elements between said pair of coil terminal and the intermediate terminal.

  A second aspect of the present invention is the electromagnetic relay according to the first aspect, wherein the pair of coil terminals are respectively provided with pressure contact portions and the intermediate terminals are respectively provided with pressure contact portions, and the pair of coil terminals. One of the pair of lead portions of the pair of surge absorbing elements is in pressure contact with each pressure contact portion, and the other lead portion is in pressure contact with each pressure contact portion of the intermediate terminal. The pair of surge absorbing elements can be freely arranged between the intermediate terminal and the intermediate terminal.

  A third aspect of the present invention is the electromagnetic relay according to the second aspect, wherein the terminal holding portions project from the upper and middle portions on both the left and right sides of the mounting wall of the terminal mounting portion, and the pair of upper and lower terminals. A fitting recess extending vertically is formed in the center of the holding portion, and the pair of coil terminals are fitted in the fitting recesses of the pair of upper and lower terminal holding portions, respectively, and the pair of upper and lower terminal holding portions are held. The press contact portions of the pair of coil terminals are respectively positioned between the portions, and the intermediate terminal holding portion protrudes from the lower portion of the center of the mounting wall of the terminal mounting portion.

  A fourth aspect of the invention is the electromagnetic relay according to the first to third aspects, wherein the mounting wall of the terminal mounting portion projects integrally at a position between the outer edge of the flange portion of the bobbin and the central coil winding body portion. The pair of surge absorbing elements formed and disposed between the pair of coil terminals and the intermediate terminal are located radially outside the bobbin of the mounting wall.

  As described above, according to the first aspect of the present invention, the mounting wall of the terminal mounting portion is provided upright on the flange portion of the resin bobbin, and the pair of coil terminals are held on the left and right sides of the mounting wall. A terminal holding portion for holding the intermediate terminal, and an intermediate terminal holding portion for holding the intermediate terminal at the center of the mounting wall. The terminal holding portions on the left and right sides respectively hold a pair of coil terminals, On the other hand, by arranging the pair of surge absorbing elements between the pair of coil terminals and the intermediate terminal, the space for installing the surge absorbing element can be saved. Thereby, simplification and size reduction of the structure of the whole electromagnetic relay can be achieved.

  According to the second aspect of the present invention, one of the pair of lead portions of the pair of surge absorbing elements is connected to each pressure contact portion of the pair of coil terminals held by the terminal holding portions on the left and right sides of the mounting wall of the terminal mounting portion. A pair of surge absorbing elements are connected between the pair of coil terminals and the intermediate terminal by pressing the lead portions and pressing the other lead portion to the respective press contact portions on both sides of the intermediate terminal held at the center of the mounting wall. As a result, the assembly of the pair of coil terminals and the connection between the pair of coil terminals and each pair of lead portions of the pair of surge absorption elements can be easily performed, and the installation of the surge absorption elements can be performed. Space can be saved. Thereby, simplification and size reduction of the structure of the whole electromagnetic relay can be achieved.

  According to the third aspect of the present invention, the terminal holding portions project from the upper and middle portions on both the left and right sides of the mounting wall of the terminal mounting portion, and the fitting recess extends vertically at the center of each of the pair of upper and lower terminal holding portions. And a pair of coil terminals are respectively fitted in the respective fitting recesses of the pair of upper and lower terminal holding portions, and the pressure contact portions of the pair of coil terminals are interposed between the pair of upper and lower terminal holding portions. And a pair of intermediate terminal holding portions projecting from the center lower portion of the terminal mounting portion and a pair of upper and lower terminal holding portions of the terminal mounting portion and a pair of intermediate terminal holding portions at the center lower portion. The surge absorbing element can be arranged without popping out. Thereby, for example, when the bobbin is covered with the cover, it is possible to reliably prevent the cover from hitting a part such as a pair of surge absorbing elements.

  According to the invention of claim 4, the mounting wall of the terminal mounting portion is integrally formed at a position between the outer edge of the flange portion of the bobbin and the central coil winding body portion, and between the pair of coil terminals and the intermediate terminal. By positioning the pair of surge absorbing elements arranged in front of the mounting wall, the mounting wall of the terminal mounting part is located behind the pair of surge absorbing elements, and the coil winding part in the center of the bobbin is located. Parts such as a plunger to be assembled do not hit the surge absorbing element during the assembly, and the parts can be assembled easily and reliably.

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

  1 is a cross-sectional view showing an electromagnetic relay according to an embodiment of the present invention, FIG. 2 is a perspective view of the electromagnetic relay, FIG. 3 is a cross-sectional view of a main part of the electromagnetic relay, and FIG. 4 is an electromagnetic used in the electromagnetic relay. FIG. 5 is a side view of the electromagnetic relay unit, FIG. 6 is a perspective view of a terminal mounting portion projecting on a bobbin used in the electromagnetic relay unit, and FIG. 7 is a rear view of the terminal mounting portion. FIG. 8 is a perspective view of a cover used for the electromagnetic relay, FIG. 9 is a perspective view showing a state before the contact bolt is fixed to the cover, and FIG. 10 is a cover with the contact bolt fixed. FIG. 11 is a sectional view of a washer for crimping and fixing a contact bolt to the cover, FIG. 12A is a plan view of an intermediate terminal used in the electromagnetic relay unit, and FIG. XX in FIG. 12 (a) Is a sectional view taken along.

  As shown in FIG. 1 to FIG. 3, the electromagnetic relay 10 is an electromagnetic that is fastened and fixed to a base plate 11 and a protrusion 11 a at the center of the base plate 11 with a screw 13 via an annular buffer rubber body 12. A relay unit 20 and a cylindrical synthetic resin cover 40 having a ceiling wall 41 covering the upper surface side of the electromagnetic relay unit 20 are provided.

  As shown in FIGS. 1, 3 to 7, the electromagnetic relay unit 20 has a cylindrical coil body 21c integrally formed at the center of the upper and lower flange portions 21a and 21b, and a terminal attached to the upper flange portion 21a. A pair of synthetic resin bobbins 21 integrally formed with a portion 22 and a coil winding body 21c of the bobbin 21 and a pair of terminals 27a and 27a attached to the terminal mounting portion 22 of the bobbin 21 Coils (electromagnetic coils) 27 respectively connected by fusing to the electric wire connection portions 25a of the coil power supply terminals (coil terminals) 25, 25, the lower flange portion 21b and the outside from the lower portion in the coil winding body portion 21c of the bobbin 21 And a cylindrical yoke 28 that also serves as a case that is bent and fixed to the lower end portion 42 a of the peripheral wall 42 of the cover 40. A rectangular plate-shaped flange receiving plate 29 that forms a magnetic path with the yoke 28 from the upper portion of the coiled-winding portion 21 c to the upper flange portion 21 a and the cylindrical coil-winding portion 21 c of the bobbin 21. The plunger 30 slides in the vertical direction along the plunger rod 31 fitted in the concave portion 30b of the plunger 30 and the plunger 30 which can be protruded and retracted via a return compression spring (return spring) 32. At the same time, it is composed of a movable plate 36 having movable contacts 35 and 35 fixed to both sides. The movable plate 36 is fixed to the bush 34.

  As shown in FIGS. 1 and 3, a circular stepped recess 30b is formed at the center of the upper surface 30a of the plunger 30, and the lower end 31a of the plunger rod 31 is fitted into the lower portion of the recess 30b. It is. A return compression spring 32 is interposed between the upper portion of the concave portion 30 b of the plunger 30 and the flange receiving plate 29, and the flange portion 31 b at the center of the plunger rod 31 and the upper end portion 31 c of the plunger rod 31 are provided. A return compression spring (return spring) 33 is interposed between the bush 34 and the bush 34 that is prevented from coming off via a washer 37. When the coil 27 is not energized by the urging force of the return compression springs 32 and 33, the coil 27 is fixed to a pair of movable contacts 35 and 35 of the movable plate 36 and a lower surface of a pair of contact bolts 45 and 45 described later. The fixed contacts 47 are separated from each other, and when an exciting current is applied to the coil 27, the upper surface 30a of the plunger 30 is attracted to the flange receiving plate 29, and the plunger 30 and the plunger rod 31 move upward. The pair of movable contacts 35, 35 come into contact with the pair of fixed contacts 47, 47.

  As shown in FIGS. 3 to 7, the mounting wall 22 a of the terminal mounting portion 22 is located at a position between the outer edge of the upper flange portion 21 a on the upper flange portion 21 a of the bobbin 21 and the central coil winding body portion 21 c. Are integrally projected so as to stand vertically. Terminal holding portions 23 and 23 for holding a pair of coil power supply terminals 25 and 25 are integrally formed at the upper and middle portions on both the left and right sides of the mounting wall 22a so as to protrude forward. A fitting recess 23a extending vertically is formed in the center of each of the pair of upper and lower terminal holding portions 23, 23.

  As shown in FIG. 4, the pair of coil power supply terminals 25 and 25 attached to the terminal attachment portion 22 is formed with a portion X parallel to the attachment wall 22a in which a round hole 25c is formed and an electric wire connection portion 25a. It consists of a portion Y perpendicular to the mounting wall 22a and a bent portion Z connecting them. In the fitting recesses 23a of the pair of upper and lower terminal holding portions 23, 23, a bent portion Z of the pair of coil power feeding terminals 25, 25 and a portion Y perpendicular to the mounting wall 22a are fitted. At this time, press fitting may be used to prevent looseness as fitting. As shown in FIG. 5, each coil power supply terminal 25 is held and fixed by opening and fixing the portion W protruding behind the mounting wall 22a.

  As shown in FIGS. 4 to 6, an intermediate terminal holding portion 24 that holds a rectangular plate-like intermediate terminal 26 is integrally formed at the lower portion of the center of the mounting wall 22 a. Furthermore, the slit contact portions 25b and 25b are formed between the pair of upper and lower terminal holding portions 23 and 23 of the pair of coil power feeding terminals 25 and 25, respectively. Further, as shown in FIG. 12A, slit groove-shaped press contact portions 26a are formed on both front sides of the intermediate terminal 26, respectively. 4 and 12A and 12B, a bowl-shaped base portion 26b having a convex portion 26c of the intermediate terminal 26 is formed on the intermediate terminal holding portion 24 of the mounting wall 22a. By being press-fitted into the rectangular locking hole 24a and locked, the intermediate terminal 26 is secured to the intermediate terminal holding portion 24 and attached.

  A pair of lead portions 38a and 38b of a pair of resistors (surge absorbing elements) 38 and a pair of diodes (surge absorbing elements) 39 are connected to the respective press contact portions 25b of the pair of coil feeding terminals 25 and 25. One lead portion 39a of the lead portions 39a and 39b is connected by pressure contact, and the other lead portions 38b and 39b are pressure contacted to the pressure contact portions 26a and 26a of the intermediate terminal 26 and connected in series. It is like that. Thus, the resistor 38 and the diode 39 as a pair of surge absorbing elements are respectively disposed between the pair of coil feeding terminals 25 and 25 and the intermediate terminal 26 positioned in front of the mounting wall 22a of the terminal mounting portion 22. It has become. The pair of surge absorbing elements 38 and 39 can be connected to the pair of coil power supply terminals 25 and 25 and the intermediate terminal 26 by using soldering or welding.

  As a result, the pair of surge absorbing elements 38 and 39 are formed by the fitting recesses 23a and 23a protruding from the mounting wall 22a, and the pair of coil power feeding terminals 25 and 25 and the intermediate terminal 26 which stand vertically from the mounting wall 22a. It is arranged in the space to be formed. Further, by connecting the lead portions 38a, 39a of the surge absorbing elements 38, 39 to the slit groove-shaped press contact portions 25b, the surge absorbing elements 38, 39 are arranged close to the mounting wall 22a. It has become.

  As shown in FIGS. 1 to 3 and FIGS. 8 to 10, a partition wall 43 is integrally formed to project from the center of the ceiling wall 41 of the cover 40 covering the upper surface side of the electromagnetic relay unit 20 incorporating the bobbin 21 to the peripheral wall 42. It is. Bolt through holes 44 and 44 are formed on both sides of the partition wall 43 of the ceiling wall 41, and a pair of contact bolts 45 and 45 are passed through the pair of bolt through holes 44 and 44. is there. Each contact bolt 45 is formed of a copper material in a columnar shape, and a hexagonal (square) flange portion 45a is integrally formed at the center thereof. Further, the mating terminal 50 abuts on the flange portion 45a of each contact bolt 45, and a nut 51 for fixing the mating terminal 50 is screwed to a screw portion 45b formed above the flange portion 45a. It is like that.

  Further, the hexagonal flange portion 45a of each contact bolt 45 is fitted into a hexagonal hole (square hole) recess 44a formed in the upper part of each bolt through hole 44 of the cover 40, and each bolt A lower part 45c of each contact bolt 45 protruding from the through hole 44 to the inside of the ceiling wall 41 of the cover 40 is fixed by caulking with a washer 46. As shown in FIG. 11, the washer 46 is formed in a conical annular shape, and is fitted into the inner side of the cover 40 of each contact bolt 45 and flattened so as to bite into and fix each contact bolt 45. Further, a fixed contact 47 to which each movable contact 35 abuts and separates is fixed to the lower surface of each contact bolt 45.

  Further, an annular plate-like packing 60 made of rubber is interposed between the lower end portion 42 a of the peripheral wall 42 of the cover 40 and the yoke 28. And the round hole 25c of the upper piece part of each coil electric power feeding terminal 25 penetrates the ceiling wall 41 of the cover 40, and is exposed outside, The ceiling wall 41 of the cover 40 which opposes the back surface of this round hole 25c. Is fitted with a hexagonal nut 61. Further, the upper piece of each coil power feeding terminal 25 and the ceiling wall 41 of the cover 40 are sealed by a rubber grommet 62.

  According to the electromagnetic relay 10 of the embodiment described above, as shown in FIG. 1, when the exciting current is not applied to the coil 27 of the bobbin 21, the pair of movable contacts 35, 35 and the pair of contact bolts 45 of the movable plate 36. , 45 are separated from each other. When an exciting current is applied to the coil 27 of the bobbin 21 and the coil 27 is excited, the plunger 30a is attracted to the flange receiving plate 29, and the plunger 30 and the plunger rod 31 move upward, and the movable plate 26 is moved. The pair of movable contacts 35, 35 come into contact with the fixed contacts 47, 47 of the pair of contact bolts 45, 45.

  In this electromagnetic relay 10, as shown in FIGS. 4 to 6, each of the pair of coil feeding terminals 25, 25 held by the pair of left and right terminal holding parts 23, 23 of the terminal mounting part 22 of the bobbin 21. One lead portion 38a of the resistor 38 and one lead portion 39a of the diode 39 are pressed into contact with the pressure contact portion 25b, and the other lead portions 38b and 39b are connected to the intermediate terminal holding portion 24 at the center lower portion of the mounting wall 22a. The resistors 38 and the diodes 39 can be arranged freely between the pair of coil power supply terminals 25 and 25 and the intermediate terminal 26 by being in pressure contact with the respective press contact portions 26a and 26a on both front sides of the held intermediate terminal 26. Assembling of the pair of coil power supply terminals 25, 25, and the pair of coil power supply terminals 25, 25 and the intermediate terminal 26 and the pair of leads 38a, 3 of the resistor 38 A pair of lead portions 39a and b and the diode 39, connected together can be easily performed with 39 b, it is possible to reduce the space of the installation space for the resistor 38 and diode 39. Thereby, the simplification and size reduction of the structure of the electromagnetic relay 10 whole can be achieved.

  Further, a press-fit recess 23a extending vertically is formed at the center of each pair of left and right and upper and lower terminal holding portions 23 and 23 of the terminal mounting portion 22 of the bobbin 21. A pair of coil power supply terminals 25 and 25 are press-fitted into the recess 23a, and the pressure contact portions 25b of the pair of coil power supply terminals 25 and 25 are positioned between the pair of left and right and upper and lower terminal holding portions 23 and 23, respectively. In addition, since the intermediate terminal holding portion 24 is integrally formed at the lower portion of the center of the mounting wall 22a of the terminal mounting portion 22, the pair of terminal holding portions 23, 23 and the intermediate terminal holding portion of the left and right and upper and lower sides of the terminal mounting portion 22 are provided. 24, the resistor 38 and the diode 39 can be arranged without protruding. Thereby, when the upper flange portion 21a side of the bobbin 21 is covered with the cylindrical cover 40, the cover 40 can be reliably prevented from hitting components such as the resistor 38 and the diode 39.

  Further, the mounting wall 22a of the terminal mounting portion 22 of the bobbin 21 is integrally projected at a position between the outer edge of the upper flange portion 21a of the bobbin 21 and the central coil winding body portion 21c, and a pair of coil feeding terminals 25 is formed. , 25 and the intermediate terminal 26, the resistor 38 and the diode 39 are positioned in front of the mounting wall 22a, so that the mounting wall 22a of the terminal mounting portion 22 is positioned behind the resistors 38 and the diode 39. Thus, the parts such as the plunger 30 and the plunger rod 31 assembled in the coil winding body 21c at the center of the bobbin 21 do not hit the resistor 38 or the diode 39 during the assembly, and the parts can be assembled easily and reliably. Can do.

  In addition, according to the said embodiment, although the case where a resistor and a diode were used as a pair of surge absorption elements was demonstrated, a pair of resistance or a pair of diodes etc. are used as a pair of surge absorption elements, and it is various variations. It may be possible to cope.

It is sectional drawing which shows the electromagnetic relay of one Embodiment of this invention. It is a perspective view of the said electromagnetic relay. It is sectional drawing of the principal part of the said electromagnetic relay. It is a front view of the electromagnetic relay unit used for the said electromagnetic relay. It is a side view of the said electromagnetic relay unit. It is a perspective view of the terminal attachment part protrudingly provided on the bobbin used for the said electromagnetic relay unit. It is the perspective view which looked at the said terminal attachment part from the back side. It is a perspective view of the cover used for the said electromagnetic relay. It is a perspective view which shows the state before fixing a contact bolt to the said cover. It is the perspective view which looked at the cover which fixed the said contact bolt from the back side. It is sectional drawing of the washer which crimps and fixes a contact bolt to the said cover. (A) is a top view of the intermediate terminal used for the said electromagnetic relay unit, (b) is sectional drawing which follows the XX line in the figure (a). It is a perspective view of the conventional electromagnetic relay.

Explanation of symbols

10 Electromagnetic relay 21 Bobbin 21a Upper flange (flange)
21c Coil winding body 22 Terminal mounting portion 22a Mounting wall 23, 23 A pair of upper and lower terminal holding portions 23a Press-fit recess 24 Intermediate terminal holding portion 25, 25 A pair of coil feeding terminals (coil terminals)
25b Pressure contact portion 26 Intermediate terminal 26a, 26a A pair of pressure contact portions 27 Coils 27a, 27a Both ends 38 Resistance (surge absorbing element)
38a, 38b A pair of lead portions 39 Diode (surge absorbing element)
39a, 39b A pair of lead portions

Claims (4)

A coil bobbin having a coil winding body at the center and a resin bobbin having a terminal mounting part on the flange, and a coil bobbin of the resin bobbin are wound around the coil bobbin, and both terminals are connected to the terminal mounting part of the bobbin. In an electromagnetic relay comprising a coil connected to each of a pair of attached coil terminals and a surge absorbing element connected to each of the pair of coil terminals and a pair of lead portions,
A mounting wall of the terminal mounting portion is provided upright on the flange portion of the resin bobbin, and a terminal holding portion for holding the pair of coil terminals is provided on both the left and right sides of the mounting wall, and the mounting wall An intermediate terminal holding part for holding the intermediate terminal at the center of the left and right sides, and holding the pair of coil terminals in the left and right terminal holding parts, respectively, and holding the intermediate terminal in the intermediate terminal holding part, An electromagnetic relay comprising a pair of surge absorbing elements disposed between a pair of coil terminals and the intermediate terminal. The electromagnetic relay according to claim 1,
A pressure contact portion is provided on each of the pair of coil terminals, a pressure contact portion is provided on each side of the intermediate terminal, and one of each pair of lead portions of the pair of surge absorbing elements is provided on each pressure contact portion of the pair of coil terminals. Each of the lead portions of the intermediate terminal, and the other lead portion is pressed against each of the press contact portions of the intermediate terminal, so that the pair of surge absorbing elements can be disposed freely between the pair of coil terminals and the intermediate terminal. Characteristic electromagnetic relay. The electromagnetic relay according to claim 2,
The terminal holding portions project from the upper and middle portions on both the left and right sides of the mounting wall of the terminal mounting portion, respectively, and a concave portion extending vertically is formed at the center of each of the pair of upper and lower terminal holding portions. The pair of coil terminals are respectively fitted in the respective concave portions of the terminal holding portions, and the press contact portions of the pair of coil terminals are positioned between the pair of upper and lower terminal holding portions, respectively, and the terminals are attached. An electromagnetic relay characterized in that the intermediate terminal holding portion projects from a lower portion of the center of the mounting wall of the portion. The electromagnetic relay according to claim 1, wherein
The pair of terminal mounting portions are integrally formed at a position between the outer edge of the flange portion of the bobbin and the central coil winding barrel portion, and are disposed between the pair of coil terminals and the intermediate terminal. An electromagnetic relay characterized in that the surge absorbing element is positioned in front of the mounting wall.

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