JPS6344259B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic switch, particularly a step switch for an electric starting motor of an internal combustion engine, in which a yoke and a magnetic core are fixed to a substrate, and a coil holder having a coil is attached to the magnetic core. A sleeve holding the magnetic core is attached, a mover is slidably disposed within the sleeve, a mover rod is fixed to the side of the mover opposite to the magnetic core, and the mover rod is fixed to the side of the mover opposite to the magnetic core. From the movable element side, a contact bridge holder having an insulating effect, a contact bridge, a locking arm insulated with respect to the contact bridge, and a contact push spring acting on the locking arm are installed in order. The invention relates to a type of device which is arranged on the yoke and has a fixing plate attached to the side of the yoke opposite the substrate, the fixing plate carrying contacts cooperating with the contact bridge.

In a known electromagnetic switch for use in electrical two-stage starting devices, at least two metal curved members are insulated and screwed to a fixed plate or to an angle-shaped member holding a contact.
It serves as a spring-loading bend for the contact bridge in the rest position. However, in this known switch, the manufacturing cost of the metal curved member with a complicated structure is high due to lack of space, and it takes a great deal of effort and expense to insulate and fix the metal curved member to the switch part through which current flows. There is a drawback. This makes economical mass production no longer possible.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electromagnetic switch that is significantly easier to manufacture and assemble than conventional electromagnetic switches and is suitable for mass production.

In order to solve this problem, in the configuration of the present invention,
In an electromagnetic switch of the type mentioned at the outset, the armature, armature rod, contact bridge holder, contact bridge, locking arm and contact pressure spring are constructed as one preassembled structural unit. , the structural unit is, on the one hand,
After insertion of the structural unit into the sleeve, the stopper is supported by a return spring in the sleeve and, on the other hand, contacts an integral stopper curved member which, after insertion of the structural unit, is placed over the structural unit and is locked in the fixed plate. ing.

With the structure of the present invention, when assembling the electromagnetic switch, a pre-assembled structure consisting of the mover, the mover rod, the contact bridge holder, the contact bridge, the locking arm, and the contact pressure spring is used. After inserting the unit into the sleeve, place the integral stopper curved member over it.
It is only necessary to lock the stopper curved member on the fixed plate, so assembly is much easier than conventional ones, and the material cost is also significantly lower because all fixing members for the stopper curved member are omitted. This also makes it easier to replace parts.

Advantageous embodiments of the device according to the invention are possible with the measures specified in the dependent claims. It is also particularly advantageous if the stop bending element is lightweight and made of insulating plastic with a shape adapted to small installation spaces, has high vibration resistance and damping properties, and does not require additional insulating elements.

Next, embodiments of the present invention will be described with reference to the drawings.

An electromagnetic switch in the form of a control relay for controlling the second stage of an electrically two-stage starting system used in internal combustion engines is fixed on the starting motor, not shown, in a known manner on the board 1. . A magnetic core 2 is attached to the substrate 1, and a brass sleeve 3 is fixed to the magnetic core 2. A brass sleeve 3 extends through a coil holder 4 holding a coil 5. A substantially U-shaped yoke 6 is similarly fixed to the substrate 1. The brass sleeve 3 projects through a yoke bottom 7 of the yoke 6 and a fixing plate 8 fixed to the outside of this yoke bottom 7. The substrate 1, the magnetic core 2, the yoke 6, the yoke bottom 7, and the fixed plate 8 are made of magnetic material. The armature 9 is slidably guided in the brass sleeve 3. The armature 9 is kept in the rest position shown in FIG. 1 by a return spring 10. A return spring 10 mounted within the brass sleeve 3 contacts one end face side of the movable element 9 and is supported within the guide hole 11 of the magnetic core 2. Mover 9
The other end of the movable rod 12 is inserted into the blind hole 13.
is fixed.

The contact bridge holder 14 is attached to the bearing attachment part 1
5, in which a contact bridge 16 is located. An insulating ring 1 is provided in an annular groove 17 provided on the end surface side of the support addition part 15.
8 has been inserted. The insulating plate 19 contacts the contact bridge 16 on one side and the locking arm 20 on the other side. Contact bridge holder 14, contact bridge 16, insulating plate 19 and locking arm 20 are connected by rivets 21 to form one structural unit. The structural units 14, 16, 19, 20 are movable along the armature bar 12. A contact push spring 22 is further arranged on the armature bar 12 . The contact push spring 22 contacts the locking arm 20 at one end and the armature bar 12 at the other end.
It is supported by a stopper 23. The armature 9 and the contact bridge 16 thus form a preassembled structural unit.

The fixed plate 8 has two insulating plates 24,
A contact 26 or a contact 27 is located on both insulating plates 24 and 25, and both contacts 26 and 27 are riveted to the fixed plate 8 by a rivet 29 with an insulating disc 28 interposed therebetween. . A pivot bearing 30 is riveted to the fixed plate 8 in the area of the insulating plate 24, and a fork-shaped locking lever 31 is pivotably mounted on the pivot bearing 30.

The pre-assembled mover-contact bridge structure unit is assembled with a brass sleeve 3.
It is pressed toward the magnetic core 2 against the pressure of the return spring 10. The stopper curved member 32 has a central hole 33, and a notch 34 in the stopper surface 35 is provided in the area of the central hole 33. Two legs 36 extend beyond the stop surface 35 and each have an inwardly directed tightening projection 37 and a locking projection 38 at the free end of the legs. The stopper bending member 32 is made of a viscoelastic insulating material. The stopper curved member 32 is inserted into the armature rod 12 during assembly. In this case, the stopper surface 35 of the stopper curved member 32 presses against the insulating plate 19. At this time, both legs 36 are such that the tightening protrusion 37 presses the fixing plate 8, while the locking protrusion 38 pushes the fixing plate 8.
the fixing plate so as to engage the edge of the The movably mounted armature-contact bridge construction unit is pressed against the stop face 35 of the stop bend 32 by means of a return spring 10, ie kept in the rest position. In this case, the fork end 39 of the locking lever 31 projects through the slot 40 of the locking arm 20.

FIG. 4 shows a modified embodiment of the electromagnetic switch. Components that are the same as those of the previously described switch are designated by the same reference numerals.

In the preassembled armature-contact bridge structural unit consisting of armature 9, armature rod 12, contact bridge holder 14, contact bridge 16, insulating ring 18, locking arm 20 and contact pressure spring 22, an elongated insulating plate 41 that protrudes somewhat beyond the width of the locking arm 20;
is the support addition part 1 of the contact bridge holder 14
5 and the locking arm 20. The stop bend 43 has an enlarged recess 44 in the edge section in the area of the central bore 33 . In the illustrated rest position, the projecting stop surface 45 rests directly on the contact bridge 16, with the insulating plate 41 extending into the edge section of the recess 44. This modified stopper curved member 43 is otherwise the same as the stopper curved member 32.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the electromagnetic switch according to the present invention, Fig. 2 is a side view of the electromagnetic switch, Fig. 3 is a plan view of the electromagnetic switch seen from above, and Fig. 4 is the same as Figs. FIG. 6 is a longitudinal sectional view showing a modified embodiment of the electromagnetic switch shown in FIG. DESCRIPTION OF SYMBOLS 1... Board, 2... Magnetic core, 3... Brass sleeve, 4... Coil holder, 5... Coil, 6...
Yoke, 7...Yoke bottom, 8...Fixing plate, 9
...Mover, 10...Return spring, 11...Guide hole, 12
...Mover bar, 13...Blind hole, 14...Contact bridge holder, 15...Bearing addition part, 16...Contact bridge, 17...Annular groove, 18...Insulating ring,
19, 24, 25, 41...insulating plate, 20...
Locking arm, 21, 29... Rivet, 22... Contact push spring, 23... Stopper, 26, 27...
Contact, 28 insulating disc, 30...swivel bearing,
31... Locking lever, 32, 43... Stopper curved member, 33... Center hole, 34, 44... Notch, 35,
45... Stopper surface, 36... Leg portion, 37... Tightening protrusion, 38... Locking protrusion, 39... Fork end, 4
0...Slit, 42...End face.

Claims (1)

[Claims] 1. A yoke and a magnetic core are fixed to a substrate, and a sleeve holding a coil holder equipped with a coil is attached to the magnetic core,
A mover is slidably disposed within the sleeve, a mover rod is fixed to the side of the mover opposite to the magnetic core, and an insulating element is attached to the mover rod from the side of the mover. A contact bridge holder, a contact bridge, a locking arm insulated with respect to the contact bridge, and a contact push spring acting on the locking arm are arranged in this order, and the yoke's substrate In an electromagnetic switch of the type in which a fixing plate is attached on the opposite side of the switch, and the fixing plate holds contacts that cooperate with the contact bridge, the movable element 9, the movable element bar 12, and the contact bridge are connected to each other. Holder 14, contact bridge 16 and locking arm 20
and the contact pressure spring 22 are constructed as a preassembled structural unit, which on the one hand is supported on the return spring 10 in the sleeve 3 after its insertion into the sleeve 3; and, on the other hand, an integral stopper bending member 3 which is placed over the structural unit and locked in the fixing plate 8 after the structural unit has been inserted.
An electromagnetic switch characterized by being in contact with 2 and 43. 2. The electromagnetic switch according to claim 1, wherein the stopper curved member 43 has a stopper surface 45 that directly contacts the contact bridge 16. 3. A patent in which an insulating plate 19 is arranged on the movable rod 12 between the contact bridge 16 and the locking arm 20, and the insulating plate comes into contact with the stop surface 35 of the stopper curved member 32. An electromagnetic switch according to claim 1. 4. The central hole 33 penetrated by the movable rod 12 and the contact push spring 22 held by the movable rod when the stopper curved members 32, 43 are installed,
Provided on the stopper curved members 32, 43,
An electromagnetic switch according to claim 1. 5. According to claim 1, when the stopper bending members 32, 43 are installed, the legs 36 of the stopper bending members cross the contact bridge 16 and engage the fixing plate 8 from the lateral direction. electromagnetic switch.