JPS6114118Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of a switch used in a starter for starting an engine.

In this type of switch, vibrations caused by high engine speeds caused the movable contact shaft support to wear out, resulting in malfunction. This invention improves the method of supporting the movable contact shaft in order to eliminate the above-mentioned drawbacks.

First, a conventional switch will be explained based on FIG. That is, in the figure, 1 is the front bracket of the starter, 2 is the case of the electromagnetic switch, 2a is the movable core receiving part provided at the tip of the case 2,
3 indicates a non-magnetic cylinder provided inside the movable core receiving portion 2a. Reference numeral 4 denotes an electromagnetic coil built in the case 2. 5 is a winding frame of the electromagnetic coil 4. 6 is a movable iron core, 7 is one end engaged with an overrunning clutch of a starter (not shown),
This is a lever whose other end engages with the tip of the movable iron core 6. 8 is a fixed iron core facing the movable iron core 6. Reference numeral 9 denotes a movable contact shaft which is loosely fitted into the fixed iron core and is made of a magnetically insulating material such as plastic. 10
is a movable contact and is provided at the tip of the movable contact shaft 9. 11 is a snap spring for preventing the movable contact 10 from coming off, and 12 is a compression coil spring that biases the movable contact 10. 13 is the aforementioned movable iron core 6
An overrunning latch (not shown) is held via a lever 7 by constantly pressing the movable core 6 with a compression coil spring provided between the movable core 6 and the fixed core 8. 14 is a switch cover; 15 is a fixed contact located opposite the movable contact 10 and held by the switch cover 14; 16 is a contact return spring provided between the switch cover 14 and the movable contact 10; 17 is a A mounting screw 18 is used to fix the switch cover 14.
and the fixed iron core 8,
A contact chamber formed by the switch cover 14, the fixed iron core 8, and the movable contact shaft 9, in which the movable contact 10 and the fixed contact 15 are arranged, is sealed from the outside.

In such a switch, the movable iron core 6 is attracted to the fixed iron core 8 by the excitation of the electromagnetic coil 4, the movable contact shaft 9 and the movable contact 10 move to the left, and the movable contact 10 moves to the fixed contact 1.
5 and other fixed contacts (not shown).

In the conventional switch described above, the movable contact shaft 9 is supported only by the fixed iron core 8, so that it is a cantilever. As a result, vibrations caused by high-speed rotation of the engine can cause the support portion to wear out, making the operation of the movable contact shaft 9 unstable, or causing the movable contact shaft 9 to rotate, causing the movable contact to strike the side wall of the switch cover 14 and cause the movable contact to strike the side wall of the switch cover 14. There were problems such as wear and tear on the parts. The switch cover 14 is usually made of a thermosetting insulating resin material, but as mentioned above, when the side walls are worn, wear particles adhere to the movable and fixed contacts, causing poor conduction.

This invention improves the method of supporting the movable contact shaft in order to eliminate the above-mentioned drawbacks. The differences between the invented device and the conventional device will be explained below. In FIG. 2, reference numeral 9a is a distal end portion formed by extending the movable contact shaft 9 and located within the switch cover 14. As shown in FIG. 14a is a recess formed in the switch cover 14 and housing the movable contact shaft tip 9a;
9 is a bearing metal that is press-fitted into the recess 14a,
The movable contact shaft tip portion 9a is supported.

As described above, in this invention, the movable contact shaft is supported at both ends by a bearing metal and a fixed iron core, and one end of the movable contact shaft is slidably supported by a bearing metal, so that vibrations caused by high-speed engine rotation are avoided. This not only makes it possible to stably support the shaft, but also makes the movement of the movable contact shaft extremely smooth, reducing wear and abrasion powder on the support part of the fixed core, the movable contact shaft, and the side wall of the switch cover. It has the effect of significantly preventing the occurrence.

It should be noted that space can be reduced by providing the switch cover recess for supporting the movable contact shaft in this invention in a separation wall that separates both the fixed contacts on the battery side and the motor side.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional switch, and FIG. 2 is a sectional view of an embodiment of this invention. In the figure, 9 is a movable contact shaft, 9a is a tip, 14a
is a recess, and 19 is a metal. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A case, an electromagnetic coil housed in the case, a movable core that is slid by the excitation of the electromagnetic coil, one end of which is engaged with the movable core, and the other end of which is engaged with an overburning clutch of the starter. a lever, a fixed core disposed opposite to the movable core, a movable contact shaft slidably supported by the fixed core and driven by the movable core; a lever, the movable core being separated from the movable contact shaft; a spring biased in the direction of
A switch cover in which a recess is formed to accommodate the tip of the movable contact shaft, a bearing metal fixed to the recess of the switch cover, and biasing the movable contact shaft in a direction opposite to the pressing direction by the movable iron core. A switch comprising a contact return spring, wherein one end of the movable contact shaft is slidably supported by the bearing metal and the other end of the movable contact shaft by the fixed iron core.