Electromagnetic actuator

Abstract

The invention relates to the technical field of automobile engines, in particular to an electromagnetic actuator which comprises an electromagnetic part and an actuating part, the electromagnetic part is connected with a power source and used for generating magnetic poles, and the actuating part is close to / away from the electromagnetic part under the action of the magnetic poles; the execution part comprises a moving mechanism, the moving mechanism moves relative to the electromagnetic part, and a permanent magnet unit is fixedly connected to the moving mechanism; the permanent magnet unit is sealed, so that impurities are prevented from being in contact with the permanent magnet unit; the permanent magnet unit is connected with the valve element unit in a magnetic attraction mode, and the permanent magnet unit drives the valve element unit to be close to / away from the electromagnetic part. The permanent magnet is arranged in a sealed mode, so that the permanent magnet can be prevented from adsorbing impurities and hindering movement of the mandrel.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, and in particular relates to an electromagnetic actuator. Background technique [0002] In current electromagnetic devices for adjusting the cam shift of an engine, it is known to vary the axial position of a sleeve which is rotatable integrally with the shaft and moves relative to the camshaft axis along the shaft. The electromagnetic actuator is the driving mechanism that drives the movement of the cam sleeve. The engine controller gives control signals according to the actual working conditions of the engine to drive the electromagnetic actuator to move the cam sleeve axially on the camshaft, thereby realizing the cam shift. position to achieve the purpose of adjusting the valve lift. [0003] But the existing cam shift electromagnetic actuator has the following defects: [0004] 1. The end face of the cover plate unit is in contact with the end face of the iron core. After durabi...

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Problems solved by technology

[0004] 1. The end face of the cover plate unit is in contact with the end face of the iron core. After durability, the end face of the iron core wears a lot, and burrs are generated at the orifice, which hinders the movement of the mandrel and affects the performance and reliability of the electromagnetic actuator;

[0005] 2. The permanent magnet of the existing cam shift electromagnetic actuator is not sealed, and the magnetic impurities such as iron chips inside the oil are easily absorbed by the magnet. Over time, impurities will be formed to hinder the movement of the spindle, affecting performance and reliability

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