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Electromagnetically driven valve

Inactive Publication Date: 2006-12-07
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The present invention was made to solve the above-described problems, and an object of the present invention is to provide an electromagnetically driven valve having a simplified structure, of which initial drive is facilitated.

Problems solved by technology

In such a case, the first and second moving elements stay at the intermediate position, and initial drive of the electromagnetically driven valve is not successfully carried out.
Meanwhile, though the electromagnetic coil is provided in the electromagnetically driven valve in order to increase initial drive force according to Patent Document 1 above, the structure may be complicated or a size may be great.

Method used

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Examples

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Effect test

first embodiment

[0039]FIG. 1 shows an electromagnetically driven valve according to the first embodiment of the present invention. The electromagnetically driven valve according to the present embodiment implements an exhaust valve in an internal combustion engine such as a gasoline engine or a diesel engine. It is noted that the electromagnetically driven valve may implement an intake valve of an internal combustion engine, in which case the electromagnetically driven valve is also structured as described hereinafter.

[0040] Referring to FIG. 1, an electromagnetically driven valve 10 is a rotary drive type electromagnetically driven valve, which is driven as a result of cooperation of electromagnetic force and elastic force. As an operation mechanism for the electromagnetically driven valve, a parallel link mechanism is adopted.

[0041] Electromagnetically driven valve 10 includes a driven valve 14, a valve-opening side moving element 21 and a valve-closing side moving element 31 oscillating by rec...

second embodiment

[0062]FIG. 4 shows an electromagnetically driven valve according to a second embodiment of the present invention. The electromagnetically driven valve according to the present embodiment is structured basically in a manner similar to electromagnetically driven valve 10 in the first embodiment. Therefore, description of a redundant structure will not be repeated.

[0063] Referring to FIG. 4, in the present embodiment, a valve-closing side moving element 51 having magnetic permeability equal to that of valve-opening side moving element 21 is provided, instead of valve-closing side moving element 31 in FIG. 1. Valve-closing side moving element 51 is formed such that a length of valve-closing side moving element 51 in a direction orthogonal to surface 31a, that is, a thickness B2 of valve-closing side moving element 51, is smaller than a length of valve-opening side moving element 21 in a direction orthogonal to surface 21a, that is, a thickness B1 of valve-opening side moving element 21...

third embodiment

[0068]FIG. 6 shows a valve-closing side moving element of an electromagnetically driven valve according to a third embodiment of the present invention. The electromagnetically driven valve according to the present embodiment is structured basically in a manner similar to electromagnetically driven valve 10 in the first embodiment. Therefore, description of a redundant structure will not be repeated.

[0069] Referring to FIG. 6, in the present embodiment, a valve-closing side moving element 61 having magnetic permeability equal to that of valve-opening side moving element 21 is provided, instead of valve-closing side moving element 31 in FIG. 1. A plurality of grooves 62 are formed in surface 31a of valve-closing side moving element 61. The plurality of grooves 62 extend in the direction in which central axis 35 extends, and they are formed at prescribed intervals from support portion 33 toward coupled portion 32.

[0070] According to such a structure, on the magnetic circuit formed wh...

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PUM

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Abstract

An electromagnetically driven valve includes a valve-opening side moving element and a valve-closing side moving element having rotatably supported support portions and carrying out oscillating movement between a valve-opening position and a valve-closing position around the support portions respectively, and an electromagnet having a coil implemented by a monocoil and arranged between the valve-opening side moving element and the valve-closing side moving element. The valve-opening side moving element and the valve-closing side moving element are held at a position intermediate between the valve-opening position and the valve-closing position while electromagnetic force is not applied. Magnetic permeability of a material forming the valve-opening side moving element is different from that of a material forming the valve-closing side moving element. According to such a structure, an electromagnetically driven valve with a simplified structure, of which initial drive is facilitated, is provided.

Description

[0001] This nonprovisional application is based on Japanese Patent Application No. 2005-161609 filed with the Japan Patent Office on Jun. 1, 2005, the entire contents of which are hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention generally relates to an electromagnetically driven valve, and more particularly to an electromagnetically driven valve including an electromagnet implemented by a monocoil. [0004] 2 . Description of the Background Art [0005] With regard to a conventional electromagnetically driven valve, for example, Japanese Patent Laying-Open No. 5-106414 discloses an electromagnetically driven valve aiming to increase initial drive force of the valve (Patent Document 1). The electromagnetically driven valve disclosed in Patent Document 1 includes a moving coil provided in a moving portion and an electromagnetic coil wound around an electromagnetic core. At the time of initial drive, thrust of the v...

Claims

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Application Information

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IPC IPC(8): F01L9/04F01L9/20
CPCF01L9/04F16K31/0682F16K31/0679F01L2009/0436F01L2009/2109F01L2009/2136F01L9/20
Inventor NAKAMURA, KIYOHARU
Owner TOYOTA JIDOSHA KK