JPH0139174B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in electromagnetic relays installed in automobiles and the like, and particularly relates to a fixing structure for a coil bobbin and a ground plate of a plunger type electromagnetic relay.

[Problem to be solved by the invention]

By the way, in the conventional method mentioned above, the bobbin,
Since the gland plate and the ring that allows the plunger to slide are provided separately on the inner periphery of the gland plate, it is not only impossible to accurately position the bobbin and the gland plate, but also the positioning of the ring. There was a problem in that the number of parts and the number of assembly steps increased.

Therefore, the present invention provides an electromagnetic relay that is easy to position and has a reduced number of parts.

[Means to solve the problem]

Therefore, in the present invention, when insert molding the grand plate into the bobbin, a bearing section is formed on the inner periphery of the hole, and a part of the bobbin is filled into the through hole of the grand plate. .

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described. FIG. 1 is a front plan view showing the configuration of an embodiment of the plunger type electromagnetic relay according to the present invention, and FIGS. 2 a, b, and c are views showing details of the coil bobbin in the electromagnetic relay of the present invention shown in FIG. , FIG. 2 a is a plan view, FIG. 2 b is a view taken from arrow A in FIG. 2 a,
FIG. 2c is a sectional view taken along line B--O--B in FIG. 2a, and FIG. 3 is a plan view of the ground plate in the electromagnetic relay of the present invention shown in FIG.

In FIG. 1, an excitation coil 4 is wound around a coil bobbin 3 made of synthetic resin, both ends of the coil are connected to a pair of terminals 25, and excitation current is supplied from the outside through the terminals 25. The coil bobbin 3 has a magnetic ground plate 5 inserted into the coil bobbin 3, which constitutes a magnetic circuit, and an electromagnetic plunger 7.
bearing part 3a, guide 3 of return spring 15
b, seat 3c of the packing 26 for the coil terminal 25, insertion portions 3d, 3d' of the terminal 25 (second
Figure b) is integrally molded. A cover 1 that forms part of the relay housing is made of synthetic resin, and has a pair of contact bolts 12 that serve as external load terminals.
A fixed contact 11 for opening and closing the load circuit is attached. That is, the contact bolt 12 is fixed to the cover 1 using a nut 20, with the fixed contact 11 and sealing O-ring 18 sandwiched inside the cover, and a washer 21 sandwiched outside. Furthermore, the cover 1 includes a hole that accommodates a movable contact 10, a contact pressure spring 16, and an insulating bush 8, which will be described later, and a connector portion 1b that accommodates a plug that is inserted from the outside to energize the excitation coil.
Furthermore, a support portion 1a for attaching the relay to an external structure is integrally molded. The electromagnetic plunger 7 is slidably supported by a guide bearing 3a of the coil bobbin 3, and is pressed upward by a return spring 15. The movable contact 10 is pressed downward by a spring 16, and an insulating bush 8 is floatingly interposed between the plunger and the movable contact. For assembly, after placing these movable parts in the cover and coil bobbin, the periphery of the ground plate 5 inserted into the coil bobbin 3 is sandwiched between the periphery of the cover 1 and the copper plate frame 2, and then the frame is assembled. By caulking the periphery of the bobbin, the cover and frame are joined together and the bobbin is fixed within the housing.

As mentioned above, the synthetic resin coil bobbin 3 shown in FIGS. 2a, b, and c has a bearing part 3a, a guide 3
b, in addition to the catch seat 3c and the insertion part 3d, a notch 3j for pulling out the excitation coil end, an insulating partition wall 3i for the coil end, and a groove part 3f into which the side of the U-shaped terminal 25 (not shown) is inserted. , 3g, 3f', 3g', holes 3e, 3e' into which positioning projections (not shown) fit, etc. are integrally molded. The ground plate 5 shown in FIG. 3 has a through hole 5a for strengthening the insert molding into the coil bobbin, a notch 5b for drawing out the coil end, and a hole 5c through which the plunger 7 passes. As shown in Figure c, the through hole 5a is filled with a portion 3h of the coil bobbin.

As described above, in the plunger type electromagnetic relay according to the present invention, the ground plate 5 made of a magnetic material with the through hole 5a formed in the coil bobbin 3 made of synthetic resin is insert-molded, and the through hole 5 is inserted into the coil bobbin 3 made of synthetic resin.
a is charged by the part 3h of the coil bobbin 3, and by forming a bearing part 3a integrated with the part 3h inside the hole, the connection between the coil bobbin and the ground plate is strengthened,
In addition, since the sliding portion of the plunger is determined by the bearing portion, the bearing portion can be positioned very easily by positioning the ground plate, which is a great effect.

[Brief explanation of drawings]

Fig. 1 is a front sectional view showing the configuration of an embodiment of the plunger type electromagnetic relay according to the present invention, Fig. 2a,
b and c are views showing details of the coil bobbin in the electromagnetic relay of the present invention shown in Fig. 1, Fig. 2a is a plan view, Fig. 2b is a side view, Fig. 2c is a front sectional view, and Fig. 2c is a front sectional view. FIG. 3 is a plan view of the ground plate in the electromagnetic relay of the present invention shown in FIG. 3...Coil bobbin, 3h...Coil bobbin 3
5...Gland plate, 5a...Through hole, 5b...Notch, 1...Cover, 2...Frame.

Claims (1)

[Claims] 1. An electromagnetic coil wound around a hollow synthetic resin coil bobbin, a plunger slidably disposed within the bobbin, and a pair of electrical contacts that are opened and closed by the movement of the plunger. and a first terminal for connecting both ends of the electromagnetic coil to an external signal source;
A plunger-type electromagnetic relay in which the electrical contact has a second terminal for connecting to an external load, comprising: a hole 5c through which the plunger passes; and a plurality of through holes 5a formed on the outer periphery of this hole. and a ground plate 5 made of a magnetic material, which is insert-molded into the coil bobbin, the through hole is filled with a portion 3h of the coil bobbin, and the inner circumferential portion of the hole has: A plunger type electromagnetic relay characterized in that a bearing part 3a for slidably holding the plunger is provided integrally with the part.