Electromagnetically Driven Valve

Abstract

An electromagnetically driven valve includes a driven valve having a stem and carrying out reciprocating motion along a direction in which the stem extends, a disc support base, a lower disc having one end coupled to the stem and the other end supported by the disc support base so as to allow free oscillation of the lower disc and oscillating around a central axis extending at the other end, and a lower torsion bar provided so as to extend along the central axis and fixed to the other end. The lower torsion bar has a fix portion fixed to the disc support base, and a phase angle thereof around the central axis with respect to the disc support base can be adjusted. With such a structure, the driven valve can carry out reciprocating motion in a stable manner, and energy loss can be reduced.

1 . An electromagnetically driven valve actuated by cooperation of electromagnetic force and elastic force, comprising: 
 a driven valve having a valve shaft and carrying out reciprocating motion along a direction in which said valve shaft extends;    a supporting member provided at a position apart from said driven valve;    an oscillating member having one end coupled to said valve shaft and the other end supported by said supporting member so as to allow free oscillation of the oscillating member and oscillating around an axis extending at said other end between an oscillation end on a valve-opening side of said driven valve and an oscillation end on a valve-closing side of said driven valve; and    a torsion spring provided so as to extend along said axis and fixed to said other end; wherein    said torsion spring includes a fix portion fixed to said supporting member, and a phase angle of the fix portion around said axis with respect to said supporting member can be adjusted, and    as a result of adjustment of said phase angle, a position of said oscillating member is adjusted to a position intermediate between the oscillation end on the valve-opening side of said driven valve and the oscillation end on the valve-closing side of said driven valve by elastic force while electromagnetic force is not applied to said oscillating member.    
   
   
       2 . The electromagnetically driven valve according to  claim 1 , wherein 
 a plurality of said oscillating members are provided, with a distance from each other in a direction in which said valve shaft extends.    
   
   
       3 . The electromagnetically driven valve according to  claim 1 , wherein 
 said fix portion includes an outer circumferential surface of said torsion spring having serration formed,    said supporting member has an opening for receiving said fix portion, and    an inner wall of said opening has serration formed, which is engaged with the serration formed on said fix portion.    
   
   
       4 . The electromagnetically driven valve according to  claim 1 , wherein 
 said fix portion includes an outer circumferential surface of said torsion spring implemented as a tapered surface,    said supporting member has an opening for receiving said fix portion, and    an inner wall of said opening has a tapered surface formed, which is pressed against and brought in contact with the tapered surface formed on said fix portion.    
   
   
       5 . The electromagnetically driven valve according to  claim 1 , wherein 
 said fix portion includes an outer circumferential surface of said torsion spring having a male screw formed,    said supporting member has an opening for receiving said fix portion, and    an inner wall of said opening has a female screw formed such that the male screw formed on said fix portion is screwed in, and a locknut is fastened to said opening from a side opposite to a direction in which said fix portion is inserted.    
   
   
       6 . A method of manufacturing the electromagnetically driven valve of  claim 1 , comprising the steps of: 
 adjusting said phase angle such that said oscillating member is positioned at a position intermediate between an oscillation end on a valve-opening side of said driven valve and an oscillation end on a valve-closing side of said driven valve; and    fixing said fix portion of which phase angle has been adjusted to said supporting member.