Electromagnetic switch for starter and electromagnetic switch starter

Abstract

The invention discloses an electromagnetic switch for a starter, belongs to the start technology field of an engine starter and aims to solve a technical problem of contact arc caused by absorption of iron powder by a static contact existing in an electromagnetic switch for a starter in the prior art. The electromagnetic switch comprises a static core, a moving core, a coil, a contact plate, a static contact and a top rod, wherein the contact plate is fixed at one end of the top rod, the moving core is fixed at another end of the top rod, the moving core under the electromagnetic force generated by the coil moves to approach the static core, the contact plate and the static contact are made to realize contact through the top rod, and a bushing is arranged between the static core and the top rod. The electromagnetic switch is advantaged in that not only can the technical problem of contact arc caused by absorption of iron powder by the static contact existing in the electromagnetic switch for the starter in the prior art be solved, cleanliness of the contact is guaranteed, but also guiding precision of the top rod, high matching precision, low wear rate and long service life are realized.

Description

technical field [0001] The invention relates to the technical field of electric motor starting for engines, in particular to an electromagnetic switch for a starter. Background technique [0002] The starter is also called a motor, which converts the electric energy of the battery into mechanical energy, drives the engine flywheel to rotate to start the engine, and its circuit is controlled by an electromagnetic switch. [0003] figure 1 It is a structural schematic diagram of an electromagnetic switch for a starter commonly used in the prior art. figure 2 yes figure 1 The circuit schematic diagram of the starter solenoid switch shown in . As shown in the figure, the electromagnetic switch for starter mainly includes: moving iron core 01, switch case 02, bushing 03, ejector rod 04, static iron core 05, switch head 06, moving iron core return spring 07, winding assembly 08 , contact plate compression spring 09, contact plate 010, and static contact 011, wherein the windi...

AI Technical Summary

Problems solved by technology

[0004] According to the above working principle, when the electromagnetic switch is working, the moving iron core 01 reciprocates under the action of the electromagnetic force. However, due to the reaction of the fork rotation movement, the moving iron core 01 will actually move in an arc, which will make the moving iron core 01 Wear occurs between the upper part and the bushing 03, the lower part of the ejector rod 04 and the static iron core 05. Over time, the gap between the inner holes of the ejector rod 04 and the static iron core 05 increases

Due to the magnetic conduction of iron powder, the iron powder produced by wear and tear enters the switch head 06 through the gap and is adsorbed to the static contact 011. In this way, the moving and static contact 011 will produce an arc at the moment of contact, resulting in contact ablation , which reduces the switch life

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