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Electromagnetic actuator

An electromagnetic actuator and magnetic force technology, applied in the direction of electromagnets, electromagnets with armatures, magnets, etc., can solve problems such as the reduction of magnetic attraction force

Inactive Publication Date: 2013-03-27
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, although the magnetic efficiency can be improved at the start of driving the plunger 3, the magnetic attraction force is significantly reduced after the plunger 3 and the stator 4 overlap each other.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0028] refer to Figure 1-3 , the first embodiment will be described hereinafter. A VVT controller mounted to the engine has a VCT mechanism 10 that is connected to an intake / exhaust camshaft and continuously changes the rotational phase of the camshaft relative to the crankshaft, thereby continuously adjusting the valve timing of the intake / exhaust valves.

[0029] Further, the VVT ​​controller has a hydraulic circuit 12 including an oil control valve (OCV) 11 hydraulically controlling the VCT mechanism 10 a and an electronic control unit (ECU) 13 electrically controlling the OCV 11 .

[0030] The VCT mechanism 10 has a shoe 14 that rotates in synchronization with the crankshaft of the engine, and a vane rotor 15 that rotates with the camshaft relative to the shoe 14 . A hydraulic actuator in the shoe 14 rotates the vane rotor 15 relative to the shoe 14 so as to advance or retard the rotational phase of the camshaft.

[0031] The shoe housing 14 is connected by a timing bel...

no. 2 example

[0083] refer to Figure 4 and 5 , the second embodiment will be described hereinafter. In each of the following embodiments, the same parts and components as those in the first embodiment are denoted by the same reference numerals.

[0084] According to the second embodiment, the sub-stator 55 is provided inside the cup guide 41 to form the stator protrusion 52 . That is, the outer stator protrusion 51 is provided outside the cup guide 41 and the inner stator protrusion 52 is provided inside the cup guide 41 .

[0085] And in the second embodiment, the same advantages as those of the first embodiment can be obtained. In addition, since the inner stator protrusion 52 is provided inside the cup guide 41, the flange portion of the cup guide 41 can be held between the sleeve 21 and the stator 4, so that the O-ring 47 can be sealed in the cup guide 41. Between the inner and outer without another O-ring 46 as shown in the first embodiment.

no. 3 example

[0087] refer to Figure 6 , 7A and 7B, the third embodiment will be described hereinafter. The electromagnetic actuator 1 has a plunger 3 coaxial with the camshaft.

[0088] The electromagnetic actuator 1 is provided with a coil 2 , a plunger 3 , a stator 4 , a magnetic conduction stator 42 , a yoke 43 and a connector 45 . The magnetically conductive stator 42 is composed of an outer rear stator 42c and an inner rear stator 42d. The yoke 43 is composed of a front yoke 43a and a rear yoke 43b.

[0089] The stator 4 has three stator protrusions. The stator protrusion is an annular protrusion protruding backward from the rear end of the stator 4 . The stator protrusions are composed of: outer stator protrusions 51 having an inner diameter slightly larger than the outer diameter of the plunger 3; inner stator protrusions 52 having an inner diameter smaller than the outer diameter of the plunger 3 and greater than the inner diameter of the plunger 3; The innermost innermost s...

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Abstract

A stator (4) is provided with a ring-shaped outer stator-projection (51) and a ring-shaped inner stator-projection (52). A plunger (3) is provided with a ring-shaped outer plunger -projection (53) and a ring-shaped inner plunger-projection (54). A magnetic force is generated at three portions (X, Y, Z) between the plunger (3) and the stator (4). The inner stator-projection (52) has a first tapered surface (5) and the outer plunger-projection (53) has a second tapered surface (6). The first tapered surface (5) and the second tapered surface (6) confront each other when the plunger (3) moves toward the stator (4).

Description

technical field [0001] The invention relates to an electromagnetic actuator for driving an object axially. The electromagnetic actuator can be applied to a hydraulic control valve with a magnetically attracted plunger. [0002] In the following description, the axial direction of the plunger is referred to as the front-rear direction, and the attracted direction of the plunger is referred to as the front (in figure 1 and 6 center to the left), and the direction in which the plunger is repelled is called the rear (in figure 1 and 6 center to right). [0003] The front-to-back direction is for explanation only and does not represent the actual installation direction of the actuator in the vehicle. Background technique [0004] JP-2004-301165A shows a variable valve timing controller (VVT) that changes the rotational phase of a camshaft relative to a crankshaft of an internal combustion engine. The VVT ​​is equipped with: a variable camshaft timing (VCT) mechanism, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K31/06
CPCF01L1/34H01F7/081H01F7/13F16K31/0613F01L1/3442F01L2001/34426F01L2001/3443F01L2001/34433
Inventor 近藤二郎村尾善之松本光一郎
Owner DENSO CORP
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