JPH019074Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Technical field) The present invention relates to an electromagnetic switch.

(Prior art) As an electromagnetic switch used in a vehicle starting circuit, a bobbin with a coil wound thereon 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) This invention was made in view of the above points, and prevents the bobbin from rotating or shifting in the case.
It is an object of the present invention to provide an electromagnetic switch that eliminates failures such as disconnection of coil terminals and improves ease of assembly.

(Summary of the invention) In order to achieve the above purpose, in this invention,
In an electromagnetic switch of a type in which a bobbin on which a coil is wound is housed in a substantially bowl-shaped case, a movable contact member is driven in conjunction with the operation of a plunger disposed in a central hole of the bobbin to open and close the switch. A concentric annular protrusion is formed on the bottom surface of the case by bulging inward of the case, and a recess is provided in at least one location of the protrusion, and the recess is provided at a predetermined position on the end surface of the bobbin opposite to the protrusion. A protrusion is formed to protrude and fit into the bobbin to position the bobbin within the case, thereby preventing the bobbin from rotating or shifting its position within the case, thereby preventing disconnection of the end of the coil. The purpose of the present invention is to provide an electromagnetic switch that eliminates such failures and improves ease of assembly.

(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 the present invention is applied.
a bobbin 4 housed in the interior and around which the coil 3 is wound; yokes 5 and 6; a plunger 8 fitted in and out of the central hole 4c of the bobbin 4; two fixed contact members 11 fixed to the case 2; 12 and a cover 10 provided with a movable contact member 13 and the like. 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 on the bottom surface 2a.
2b' is formed to bulge inward of the case. These protrusions 2b, 2b' are connected to the case 2 as shown in FIG.
They are arranged symmetrically to form one concentric circle on the bottom surface 2a of the case 2, and between the opposite ends of each projecting band 2b, 2b', that is, the two ends 2c, 2c' on the diameter of the concentric circle are located on the bottom surface 2a of the case 2. , and have different widths along the circumferential direction, with the width of the flat portion 2c being wider than the width of the flat portion 2c'. Each of these projections 2b, 2
The protruding height of b' from the bottom surface 2a is the same as the thickness of the yoke 6, and the inner diameter of the circle formed by these protrusions 2b and 2b' is slightly larger than the outer diameter of the yoke 6. ing.

The bobbin 4 is integrally formed from a synthetic resin member, and has a hole 4c (FIG. 3) in the center, and a flange 4d at the periphery of the opening end of the upper end surface 4a of the hole 4c.
is provided protruding from the upper end surface 4a, and two coil guides 4e (only one is shown) for pulling out both ends of the coil 3 are provided in the axial direction of the hole 4c, that is, the upper end surface 4a.
It is installed vertically. The lower end surface 4b of this bobbin 4 has the case bottom surface 2a as shown in FIG.
Protrusions 4f, 4 that fit into flat parts 2c, 2c' provided between two protruding bands 2b, 2b' formed in a bulging manner.
f′ is provided protrudingly. Each of these protrusions 4f, 4
f' is provided at a predetermined position with respect to the coil guide 4e. That is, as will be described later, the cover 10 fixed to the case 2 is positioned at a predetermined position with respect to the case 2, and in this positioned state, each coil guide 4e of the bobbin 4 is connected to the coil guide 2 provided on the cover 10. The protrusions 4f, 4f' are provided so as to align with the two holes 10c (only one is shown), respectively. The lower end surface 4b of this bobbin 4 is placed on the protrusions 2b, 2b', and the protrusions 4f, 4f' are fitted into the flat parts 4c, 4c' between these protrusions,
It is positioned and arranged within the case 2.

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 peripheral surface is formed into a flange shape. Surrounds the inner peripheral surface. Two coin guides 4e erected on the upper end surface 4a of the bobbin 4 penetrate through holes 5c provided in the yoke 5 and protrude upward. A yoke 6 is disposed between the bottom surface 2a of the case 2 and the lower end surface 4b of the bobbin 4 and inside the projecting bands 2b, 2b'.
and the lower end surface 4b of the bobbin 4.

The plunger 8 is fitted into the center hole 4c of the bobbin 4 through the 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, connection terminal 15 of coil 3
(only one is shown) are arranged as shown in the figure, and a hole 15a communicating with the coil guide insertion hole 10c is provided on the bottom surface of the connection terminal 15. This cover 10 is fitted into the open end of the case 2, and includes an annular step 10a provided on the outer periphery and a flange 5 of the yoke 5.
A liquid-tight O-ring 17 is interposed between the opposite end surface of a. Both ends of the coil 3 are led out along each coil guide 4e of the bobbin 4 to its tip,
Each of these coil guides 4e loosely passes through each hole 10c of the cover 10, and its tip is connected to the hole 1 of the connection terminal 15.
5a slightly protrudes outward from the cover 10.

After the cover 10 is fitted into the case 2 as described above, it is firmly fixed to the case 2 by caulking. Each terminal of the coil 3 is connected to each connection terminal 15 by soldering. Moreover, the soldering caused by this soldering also causes the holes 10 of the cover 10 to
c is sealed.

When the coil 3 is deenergized, the plunger 8 is pushed up by the spring 7 as shown in FIG. The electromagnetic switch 1 is separated from the fixed contact members 11 and 12, and the electromagnetic switch 1 is turned off (opened and closed). 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 is moved downward by the spring 14 to connect to each fixed contact member 11, 12. Pressure contact is made, and the electromagnetic switch 1 is turned on (closed).
In this embodiment, two semicircular protrusions 2b and 2b' are provided on the bottom of the case 2, and these protrusions 2
flat parts 2c and 2 for positioning the bobbin between b and 2b'
c', but the present invention is not limited to this. An annular projecting band may be formed to form one concentric circle on the bottom of the case, and engagement recesses for positioning may be formed at predetermined locations on this annular projecting band. Alternatively, at least one recess may be provided, and as in this embodiment, a plurality of recesses, for example two, of different sizes are provided, and protrusions that fit into these recesses are provided at predetermined positions on the opposing end surface of the bobbin. (convex portion) may be provided.

(Effects of the invention) As explained above, according to the invention, a bobbin in which a coil is wound is housed in a substantially bowl-shaped case, and a movable contact member In the electromagnetic switch of the type that opens and closes the switch by driving the case, a concentric annular projecting band is formed on the bottom surface of the case and bulges inward of the case, and a recess is provided in at least one part of the projecting band. In addition, a protrusion that fits into the recess is formed protrudingly at a predetermined position on the end surface of the bobbin opposite to the projecting band, and the bobbin is positioned within the case, so that the bobbin is positioned within the case. Rotation, displacement, etc. can be prevented, and as a result, failures such as disconnection of the ends of the coil can be prevented, and ease of assembly can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the electromagnetic switch according to the present invention, FIG. 2 is an end view of the case of FIG. 1, and FIG. 3 is an end view of the bobbin of FIG. 1. 2... Case, 2b, 2b'... Protrusion, 3... Coil, 4... Bobbin, 4f, 4f'... Protrusion, 5,
6... Yoke, 8... Plunger, 10... Cover, 11, 12... Fixed contact member, 13... Movable contact member, 15... Connection terminal.

Claims (1)

[Scope of utility model registration request] In an electromagnetic switch of a type in which a bobbin with a coil wound thereon is housed in a substantially bowl-shaped case, a movable contact member is driven in conjunction with the operation of a plunger disposed in a central hole of the bobbin to open and close the switch. A concentric annular protrusion is formed on the bottom surface of the case by bulging inward of the case, and a recess is provided in at least one location of the protrusion, and the protrusion is provided at a predetermined position on the end surface of the bobbin opposite to the protrusion. An electromagnetic switch characterized in that a protrusion that fits into a recess is formed in a protruding manner to position the bobbin within the case.