JPH017963Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an electromagnetic switch device, also called an engagement switch, which is attached to a starting motor.

A conventional electromagnetic switch device of this type is shown in FIG. That is, in FIG. 1, 1 is the electromagnetic switch body, 2 is a case made of magnetic material,
3 is a solenoid coil wound around the inner circumferential surface of case 2; 4 is a fixed iron core fitted into a spigot part 21 formed in the rear opening of case 2; A movable core is drawn into the housing, 6 is a coil spring that presses the movable core 5 back to its original position, 7 is a movable contact shaft inserted into a through hole 41 formed on the inner peripheral surface of the fixed core 4, and 8 is a movable contact. A movable contact is supported on a shaft 7, 9 is a retaining ring attached to the movable contact shaft, 10 is a contact spring that presses the movable contact 8 in the direction of the retaining ring 9, and 11 is fitted into the spigot part 21 of the case 2. The resin molded cap 12 is attached to the fixed iron core 4 and the cap 11
13 is the cap 1 inserted between the
A coil spring 14 which presses and biases the movable contact shaft 7 with the inner circumferential surface of the cap 1 as a seat surface is disposed opposite the movable contact 8 and is secured by a terminal bolt 15 inserted into the through hole 111 of the cap 11. Fixed contacts 16 constituting a pair of supported input/output terminals are toothed washers for fixing the terminal bolts 15 to the cap 11.

In the conventional device configured in this way, the solenoid coil 3 is energized, the movable core 5 is attracted to the fixed core 4, and the movable contact shaft 7 is moved against the reverse biasing force of each spring 6, 13. By pressing in the direction of the arrow shown in the figure, the movable contact 8 comes into contact with the fixed contact 14, and the space between the fixed contacts 14 is closed. At this time, the movable iron core 5
A shift lever (not shown), which is cam-engaged with the front end of the shift lever, is urged to rotate.

This conventional type has drawbacks such as requiring a large amount of space for the contact mechanism, the movable contacts are not supported in the same housing, and it is difficult to assemble while maintaining the required precision.

This idea attempts to eliminate the drawbacks of the conventional devices, and the input and output terminals are arranged on the same axis, and the inner terminal is pressed and biased to form a closed contact circuit. The present invention provides an electromagnetic switch device having a compact and highly accurate contact structure.

An embodiment of this invention will be described below based on FIG. 2. That is, in FIG. 2, 17 is a shaft movable in the axial direction by a movable iron core similar to that shown in FIG. A cylindrical fixed contact is inserted and screwed with a nut 20, 21 is an insulating bushing fixed to the inner circumferential surface of the fixed contact 19, and 22 is slidably inserted into the inner circumferential surface of the insulating bushing 21. 23 is a movable contact provided at one end of the movable contact bar 22 facing the fixed contact 19; 24 is a movable contact bar provided at the other end of the movable contact bar 22; a washer 241, a spring washer 2;
42, output terminal section consisting of hexagonal nut 243, 2
Reference numeral 5 designates a return coil spring disposed between the insulating bush 21 and the movable contact 23.

Note that the other configurations are the same as the conventional one shown in FIG. 1, so explanations will be omitted.

In this structure, when the solenoid coil 3 is energized and the shaft 17 is moved in the direction of the arrow shown by the movable iron core (not shown),
The movable contact rod 22 similarly moves in the direction of the arrow, the movable contact 23 and the fixed contact 19 come into contact, and the fixed contact 1
9 and an output terminal section 24 (not shown) connected to
A circuit is closed with a DC motor (not shown) connected to the DC motor, and the DC motor is energized.

In this case, the movable contact rod 22 is connected to the fixed contact 19.
are disposed coaxially with each other, so when the fixed contact and the movable contact come into contact, chattering, etc. is reduced. Furthermore, since both contacts have a single contact point, failures due to poor contact are reduced.

Here, the movable contact rod 22 is configured to be pressed by the shaft 17, but it may be configured to be directly pressed by a movable iron core whose end portion is insulated from the ground.

As mentioned above, the electromagnetic switch device according to this invention drives a movable contact rod, which has a movable contact at one end and a terminal section at the other end, by a movable iron core that is driven when the solenoid is energized. A cylindrical fixed contact is placed coaxially with the rod, improving characteristics and reliability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional electromagnetic switch device of this type, and FIG. 2 is a sectional view of a main part showing an embodiment of this invention. In the figure, 3 is a solenoid coil, 4 is a fixed core,
5 is a movable iron core, 17 is a movable contact shaft, 18 is a resin mold cap, 19 is a fixed contact, 21 is an insulating bushing, 22 is a movable contact rod, 23 is a movable contact, 2
4 is an output terminal section. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A movable core that is driven when the solenoid is energized; a movable contact at one end;
An electromagnetic switch device comprising a movable contact rod having a terminal attached to the other end, and a cylindrical fixed contact disposed coaxially with the movable contact rod so as to be able to freely come into contact with and separate from the movable contact.