Electromagnetically Driven Valve

Abstract

An electromagnetically driven valve includes a driven valve having a stem extending in a prescribed direction and an umbrella-shaped portion provided at a tip end of the stem and opening/closing an intake/exhaust port, a lower disc and an upper disc having one ends coupled to the stem and the other ends supported by a disc support base so as to allow free oscillation of the disc respectively and oscillating around the other ends so as to cause the driven valve to carry out reciprocating motion in the prescribed direction, a lash adjuster provided in the stem, and a guide ring guiding the lash adjuster along the prescribed direction. The lash adjuster contracts and expands in the prescribed direction and accommodates displacement of the stem produced in a direction orthogonal to the prescribed direction as a result of reciprocating motion of the driven valve. With such a structure, the driven valve carries out smooth reciprocating motion.

1 . An electromagnetically driven valve comprising: 
 a driven valve ( 14 ) having a valve shaft ( 12 ) extending in a prescribed direction and a valve element ( 13 ) provided at a tip end of said valve shaft ( 12 ) and opening/closing an intake/exhaust port;    an oscillating member ( 20 ,  30 ) having one end ( 22 ,  32 ) coupled to said valve shaft ( 12 ) and the other end ( 23 ,  33 ) supported by a supporting member ( 51 ) so as to allow free oscillation of the oscillating member and oscillating around said other end ( 23 ,  33 ) so as to cause said driven valve ( 14 ) to carry out reciprocating motion in said prescribed direction;    a buffer member ( 16 ) provided in said valve shaft ( 12 ) between the tip end where said valve element ( 13 ) is provided and a position where said one end ( 22 ,  32 ) is coupled; and    a guide member ( 45 ) guiding said buffer member ( 16 ) along said prescribed direction; wherein    said buffer member ( 16 ) contracts and expands in said prescribed direction and accommodates displacement of said valve shaft ( 12 ) produced in a direction orthogonal to said prescribed direction as a result of the reciprocating motion of said driven valve ( 14 ),    said valve shaft ( 12 ) has a first shaft portion ( 18 ) including a first end surface ( 18   a ) abutting on a surface ( 16   a ) of said buffer member ( 16 ) and located on a side where said one end ( 22 ,  32 ) is coupled with respect to said buffer member ( 16 ), and a second shaft portion ( 19 ) located on a side of said valve element ( 13 ) with respect to said buffer member ( 16 ),    said first end surface ( 18   a ) makes sliding movement with respect to the surface ( 16   a ) of said buffer member ( 16 ), so that displacement of said valve shaft ( 12 ) produced in the direction orthogonal to said prescribed direction is accommodated,    said second shaft portion ( 19 ) includes a second end surface ( 19   a ) connected to a surface ( 16   b ) of said buffer member ( 16 ), and    said first shaft portion ( 18 ) is formed such that said first end surface ( 18   a ) has an area larger than that of said second end surface ( 19   a ).    
   
   
       2 . (canceled)  
   
   
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