JPS59209234A - Magnet switch - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in magnetic switches used in starters.

Conventionally, a magnet switch for a starter has had a configuration as shown in FIG. That is, the movable contact 10 fixed to the plunger 3, which is attracted by an undisclosed coil when energized, is held between an insulating plate 15 and an insulator 17, and the insulator 17 is further pressed by a contact pressure spring 16 held by a washer plate 18. There is. Therefore, when the plunger 3(1) is attracted, the contact pressure spring 16 is compressed, and the movable contact 10 is pressed against a fixed contact (not shown) with contact pressure. And Nippondenso Public Technical Report JAN 19
80 No. 17 If the structure is as shown in reference number 17-058, the washer plate 18 requires welding to fix, making it troublesome to assemble, and the plunger 3 also requires space to accommodate the contact pressure spring 16. It becomes longer in the axial direction and the structure becomes more complicated.

In order to solve the above-mentioned drawbacks, the present invention provides an elastic body with insulation properties to support and fix the movable contact to the plunger, thereby improving the assemblability of the starter magnetic switch, reducing the number of parts, and making it smaller. This is the purpose.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 2 is a schematic diagram of the magnetic switch of the present invention, and FIG. 3 is a sectional view of the magnetic switch of the present invention. 1 is the case of the main body of the magnetic switch, 2 is the cover that is fixed to case 1, and 3 is the suction when energized.

4.5 (2) is a field core; 6 is a coil case that houses the coil 9; 7 is a plunger that is held and returns when not energized;
8 is a non-magnetic sleeve that slides on the plunger 3; 8 is an elastic body that presses and fixes the field core 4 and the coil case; 9 is a non-magnetic sleeve that slides on the plunger 3;
1 is a coil that attracts and holds the plunger 3; 10 is a movable contact fixed to the plunger 3; 11 is an insulating plate that insulates the movable contact 10 and the plunger; and 12 is in contact with the movable contact 10 to energize a starter motor (not shown). The fixed contact, 13 is an insulating plate that insulates the fixed contact 12, I4 is a return spring that returns the plunger 3, and 15 is a contact pressure insulating spring made of an elastic material that also has insulation properties, and is made of resin such as nylon, polypropylene, or hard rubber. is used and is tightened and fixed to plunger 3.

Next, the operation of the above configuration will be explained. When a key switch (not shown) is closed from the non-energized state shown in FIG. 3, first, the coil 9 is energized and a magnetic force acts, and the plunger 3 is attracted. The plunger 3 compresses the return spring 14 and is sucked until the movable contact 10 collides with the fixed contact 12 and stops. At that time (3), the contact pressure insulating spring 15 uses its elasticity to press the movable contact IO against the fixed contact 12 to complete the contact between the contacts and further buffer the impact at the time of collision.

In this way, the movable contact 10 and the fixed contact 12 are closed, and the motor of the starter (not shown), in which the plunger 3 is held, is energized to perform cracking. Next, when a key switch (not shown) is opened, the magnetic force generated in the coil 9 is deenergized.
The plunger 3 is returned to its initial non-energized state by the return spring 14.

The contact pressure insulating spring 15 insulates the movable contact 10 and presses the contact, eliminating the need for the conventional contact pressure spring 16, so that the length in the axial direction can be kept to the minimum necessary length. Furthermore, it is easier to assemble because it uses tightening instead of welding.

As described above, according to the present invention, by providing an elastic body with insulating properties to support and fix the movable contact to the plunger, ease of assembly is improved by employing tightening fixing, and the elastic body is insulated. (4) Since the contact pressure spring is eliminated and the number of parts is reduced, the length in the axial direction can be kept to the minimum necessary, which has the excellent effect of reducing weight and size.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional magnet switch, FIG. 2 is a schematic diagram of a magnet switch of the present invention, and FIG. 3 is a sectional view of the magnet switch of the present invention. 3... Plunger, 9... Coil, 10... Movable contact, 11... Insulating plate, 12... Fixed contact, 15...
...Contact pressure insulation spring. Representative Patent Attorney Takashi Okabe (5) Figure 1 Figure 2

Claims (1)

[Claims] In a starter magnetic switch, in which a plunger is attracted when current is applied, and a movable contact and a fixed contact fixed to the plunger are closed, an elastic body having an insulating property is provided to support and fix the movable contact to the plunger. A starter magnetic switch characterized by: