JPH019082Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a coil bobbin for winding a coil of an electromagnetic switch.

(Prior art) As an electromagnetic switch used in a vehicle starting circuit, a bobbin wound with a coil is housed in a bowl-shaped case, and a plunger can be moved in and out of the center hole of the bobbin via a return spring. opening the switch by driving a movable contact member disposed on a cover fixed to the case in connection with the insertion and removal of the plunger;
There is an electromagnetic switch designed to close the switch. In electromagnetic switches with such a configuration, the bobbin tends to rotate or shift within the case due to vehicle vibrations, which can lead to failures such as disconnection of the coil pull-out terminal, and the bobbin may rotate or shift within the case during assembly. If the coil rotates, the direction in which the end of the coil is drawn out cannot be determined, resulting in problems such as poor assembly performance, which is particularly inconvenient when automatic assembly is performed.

(Purpose of the invention) The present invention was made in view of the above points, and it prevents the bobbin from rotating or shifting in the case, eliminates failures such as disconnection of the coil terminal, and improves ease of assembly. An object of the present invention is to provide a coil bobbin for an electromagnetic switch.

(Summary of the invention) In order to achieve the above purpose, in this invention,
An electromagnetic switch of the type in which a coil bobbin with a coil wound thereon is housed in a case, and the end of the coil is connected to a connection terminal provided on the top surface of a cover fixed to the case by pulling it out through a through hole provided in the cover to the top surface. In the coil bobbin, the terminal drawing notch is provided on the outer periphery of the upper end surface of the coil bobbin, a guide shaft that loosely passes through the through hole is provided at the edge of the notch, and a shaft extends from the base to the tip of the guide shaft on the circumferential surface of the guide shaft. A groove is provided in the direction, and the terminal is inserted into the groove and passed through the through hole together with the guide shaft to be guided to the connection terminal, thereby preventing disconnection of the coil terminal and improving ease of assembly. The present invention provides a coil bobbin for an electromagnetic switch.

(Embodiment of the invention) An embodiment of the invention will be described below in detail based on the accompanying drawings.

FIG. 1 shows a cross section of an electromagnetic switch to which a coil bobbin according to the present invention is applied. A plunger is fitted into the central hole 4c via a return spring 7 so as to be freely removable, a movable contact member 13 fixed to the case 2 and arranged via two fixed contact members 11 and 12 and a contact spring 14, etc. provided cover 1
Consists of 0 etc. The case 2 is made of a magnetic material such as iron and has a substantially bowl-like shape, and has two semicircular protrusions 2b and 2b' bulging inward from the bottom surface 2a. 2b' are arranged on the bottom surface 2a of the case 2 so as to form one concentric circle.

A flange 4d protrudes from the opening end periphery of the upper end surface 4a of the central hole 4c of the bobbin 4, and this upper end surface 4a
As shown in FIG. 2, an arc-shaped yoke positioning protrusion 4e is protrudingly provided on the yoke, and coil terminal drawing notches 4f and 4f' extending from the outer periphery of the upper end surface 4a to approximately the center of the protrusion 4e are provided. . As shown in FIGS. 2 to 4, two coil guide shafts 4g and 4g' are vertically provided on the upper surface of the ridge 4e at a predetermined interval.

Each base of the guide shafts 4g, 4g' has a large diameter, and notches 4h, 4h' are provided on each one side.
As shown in Fig. 3, coil grooves 4i and 4i' are carved on one side circumferential surface of g' over a predetermined length from the tip to the base, and the coil grooves 4i and 4i' are diametrically symmetrical to each of these grooves 4i and 4i'. As shown in FIG. 4, axial coil grooves 4k and 4k' are formed on the other side circumferential surface from the tip to the base. Furthermore, as shown in FIG. 3, cutouts 4m and 4m' for drawing out the coil terminals are provided on the back surface of the upper end surface 4a, which are connected to the cutouts 4f and 4f'. The coil bobbin 4 having such a shape is integrally formed of an insulating synthetic resin member.

Each terminal of the coil 3 wound around the coil bobbin 4 is connected to a notch 4 in the upper end surface 4a of the coil bobbin 4.
m, 4m' and 4f, 4f' as shown in FIG. After being fixed to the guide shaft 4g, the coil is inserted into the coil groove 4k and guided to the upper end, and its tip 3a' is bent at the tip of the guide shaft 4g as shown by the two-dot chain line in FIG. The other end of the coil 3, which is then inserted into the coil groove 4i on the opposite side, is attached to the guide shaft 4g' in exactly the same manner as the one end. In this way, each end of the coil 3 is attached to the guide shafts 4g, 4g', respectively, and each end is wound around the guide shaft at the notches 4h, 4h', thereby preventing wire breakage due to tension.

The bobbin 4 is housed in the case 2 as shown in FIG. 1, and its lower end surface 4b is placed on protrusions 2b and 2b' provided on the bottom surface 2a of the case. Further, a yoke 6 is interposed inside the projecting bands 2b, 2b' and is press-fitted to the case bottom surface 2a and the bobbin lower end surface 4b.

The yoke 5 is placed on the upper end surface 4a of the bobbin 4, the central hole 5b is fitted onto the flange 4d, and the peripheral edge 5a
is erected perpendicularly to the plate surface to form a flange shape, and its outer circumferential surface contacts the inner circumferential surface of the case 2. The protruding band 4e of the bobbin 4 is fitted into an arc-shaped hole 5c drilled in the yoke 5 and protrudes from the upper surface of the yoke 5, and each coil guide 4g, 4g' is connected to the yoke 5 as shown in the figure.
protrudes vertically above. The bobbin 4 and the yoke 5 are locked to each other by the protrusion 4e and the hole 5c, and the bobbin 4 is disposed approximately at the center of the case 2.

The plunger 8 is fitted into the center hole 4c of the bobbin 4 via a return spring 7 so as to be freely removable and removable, and is moved up and down by the cooperation of the magnetic attraction force of the coil 3 and the spring force of the spring 7.

The cover 10 has two fixed contact members 11, 1.
2. Movable contact member 13 and coil connection terminal 15
(only one is shown) are arranged as shown in the figure, and the movable contact member 13 is arranged so that its end face can come into contact with the end face of the insulating member 9 disposed on the end face of the plunger 8. This cover 10 is provided with through holes 10c (only one shown) penetrating from the lower end surface to the upper end surface at positions facing the respective guide shafts 4g, 4g' of the bobbin 4. This through hole 10c has a slightly larger diameter than the guide shaft 4g, and an eyelet 16 is fitted into the hole 10c as shown in detail in FIG.

As shown in FIG. 6, the head 16a of the eyelet 16 is tightly attached to the inner end surface of the hole 10c via a sealing O-ring 17, and the end 16b protrudes from the upper surface of the cover 10. The substantially L-shaped connection terminal 15 is disposed on the upper surface of the cover 10, one end surface 15a is in contact with the upper surface of the cover, and the terminal 16 of the eyelet 16 is inserted into the hole 15b bored in the end surface 15a.
b is fitted inside. A guide shaft 4g is inserted into this eyelet 16 with a slight gap. Other coil connection terminals (not shown) are also provided in the same manner as the connection terminal 15.

The cover 10 is fitted into the open end of the case 2 as shown in FIG.
A liquid-tight O-ring 18 is interposed between Oa and the opposing end surface of the flange 5a of the yoke 5. Bobbin 4
One of the guide shafts 4g is inserted through the eyelet 16 of the cover 10 as shown in FIGS. 1 and 6,
Its tip slightly protrudes from the end of the eyelet 16. The other guide shaft 4g' of the bobbin 4 also passes through an eyelet (not shown) in the same way as the guide shaft 4g, and its tip slightly protrudes from the end of the eyelet.

After the cover 10 is fitted to the case 2 as described above, it is firmly fixed by caulking. In this state, the yoke 5 and bobbin 4 are pressed through the O-ring 18, and the bobbin 4 is crimped and held between the yokes 5 and 6, and is firmly fixed within the case 2. Next, as shown in FIG. 6, one end 3a' of the coil 3 is connected to the connecting terminal 15 together with the eyelet 16 by soldering. With this solder 20, the eyelet 16 and the guide shaft 4g,
The gaps between the fitting portions of the connection terminals 15 are sealed. The other end of the coil 3 is also connected to a connecting terminal (none of which is shown) in the same way as the one end 3a'. In this way, both ends of the coil 3 are pulled out above the bobbin 4 and connected to respective connection terminals arranged on the cover 10.

The fixed contact members 11 and 12 are respectively connected to a battery and a starter motor (both not shown), and one of the connection terminals is connected to the battery and the other to a starter switch (both not shown) through a main fuse. Ru.

When the coil 3 is deenergized, the plunger 8 is pushed upward by the spring 7 as shown in FIG. ,1
2, the electromagnetic switch 1 is turned off (open). When the coil 3 is energized, the plunger 8 is attracted against the spring force of the spring 7 and moves downward, and accordingly, the movable contact member 13 moves downward due to the spring force of the contact spring 14, and each fixed contact member 11 and 12, and the electromagnetic switch 1 is turned on (closed).

(Effects of the invention) As explained above, according to the invention, a coil bobbin wound with a coil is housed in a case, and the connection terminal provided on the upper surface of the cover fixed to the case is passed through the through hole provided in the cover. In a coil bobbin for an electromagnetic switch of the type in which the terminal of the coil pulled out on the upper surface is connected, a notch for pulling out the terminal is provided on the outer periphery of the upper end surface of the coil bobbin, and a guide shaft passing loosely through the through hole is provided at the edge of the notch. erected,
A groove is provided in the circumferential surface of the guide shaft in the axial direction from the base to the tip, and the terminal is inserted into the groove and passed through the through hole together with the guide shaft to be guided to the connection terminal. There are excellent effects such as prevention of disconnection of the terminal, extremely improved ease of assembly, and automatic assembly possible.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an electromagnetic switch to which the coil bobbin according to the present invention is applied, Fig. 2 is an end view of the coil bobbin shown in Fig. 1, Fig. 3 is a side view of the main part in the direction of the arrow in Fig. 2, 4 is a rear view of FIG. 3, FIG. 5 is a diagram showing the assembly when the end of the coil is attached to the guide shaft shown in FIG. 3, and FIG. 6 is an enlarged view of the main part of FIG. 1. 2... Case, 3... Coil, 4... Coil bobbin, 4g, 4g'... Guide shaft, 5, 6... Yoke, 10... Cover, 11, 12... Fixed contact member, 13... Movable contact Component, 15... connection terminal.

Claims (1)

[Scope of utility model registration request] An electromagnetic switch of the type in which a coil bobbin wound with a coil is stored in a case, and the terminal of the coil drawn out to the top surface is connected to a connection terminal provided on the top surface of the cover fixed to the case through a through hole provided in the cover. In the coil bobbin, the terminal drawing notch is provided on the outer periphery of the upper end surface of the coil bobbin, a guide shaft that loosely passes through the through hole is provided at the edge of the notch, and a shaft extends from the base to the tip of the guide shaft on the circumferential surface of the guide shaft. A coil bobbin for an electromagnetic switch, characterized in that a groove is provided in the direction, and the terminal is inserted into the groove, passes through the through hole together with the guide shaft, and is guided to the connection terminal.