Engine electromagnetic valve operating device

Abstract

In an engine electromagnetic valve operating device ( 20 ), an intake valve ( 17 ) is opened and closed by means of a first electromagnet ( 21 ), which is fixed to a cylinder head, and a second electromagnet ( 22 ), which is pivotably supported on the cylinder head by a fixed shaft ( 38 ) so as to be capable of swinging, attracting a first attraction face ( 23 b ) and a second attraction face ( 23 c ) respectively of an armature ( 23 ) having one end pivotably supported on the cylinder head by the fixed shaft ( 38 ) so that it can swing and having the other end abutting against a stem ( 18 ) of the intake valve ( 17 ). In this arrangement, by changing the angle between the first and second electromagnets ( 21, 22 ) by swinging the second electromagnet ( 22 ), the amount of lift of the intake valve ( 17 ) can be changed freely. Furthermore, since only at least one of the first and second electromagnets ( 21, 22 ) needs to be made to swing and, moreover, it is unnecessary to move the position of the armature ( 23 ), it is possible to form the electromagnetic valve operating device ( 20 ) compactly.

1 . An engine electromagnetic valve operating device comprising an armature having one end pivotably supported on an engine main body so as to be capable of swinging and having the other end abutting against a stem of a valve, a first electromagnet that can attract a first attraction face of the armature, and a second electromagnet that can attract a second attraction face of the armature,
 at least one electromagnet of the first and second electromagnets being supported so as to be capable of swinging around a fixed shaft whose position is fixed relative to the engine main body.   
   
   
       2 . The engine electromagnetic valve operating device according to  claim 1 , wherein said one electromagnet causes the valve to lift, and defines the amount of lift of the valve. 
   
   
       3 . The engine electromagnetic valve operating device according to  claim 1  or  claim 2 , wherein the device comprises a pair of valve springs for urging the armature to a neutral position, a spring seat supporting one valve spring being fixed to the engine main body and a spring seat supporting the other valve spring moving in response to swinging of said one electromagnet. 
   
   
       4 . The engine electromagnetic valve operating device according to  claim 3 , wherein said other valve spring and the spring seat supporting the valve spring are disposed on the outer periphery of the stem of the valve, and the spring seat is integrally connected to and moves with said one electromagnet. 
   
   
       5 . The engine electromagnetic valve operating device according to  claim 1  or  claim 2 , wherein the armature is pivotably supported via the fixed shaft. 
   
   
       6 . The engine electromagnetic valve operating device according to  claim 5 , wherein the other electromagnet of the first and second electromagnets is provided with a fixing part for fixing the fixed shaft. 
   
   
       7 . The engine electromagnetic valve operating device according to  claim 1 , wherein the device comprises a first valve spring for urging the valve in a valve-closing direction and a second valve spring for urging the valve in a valve-opening direction, the second valve spring urging a lever provided on said one end side of the armature. 
   
   
       8 . The engine electromagnetic valve operating device according to  claim 7 , wherein said one electromagnet comprises a lever provided on one end side via which the electromagnet is pivotably supported on the fixed shaft, an urging force of the second valve spring on said one end side acting on the lever of the armature, and an urging force of the second valve spring on the other end side acting on the lever of said one electromagnet. 
   
   
       9 . The engine electromagnetic valve operating device according to  claim 8 , wherein at least parts of the lever of the armature and the lever of said one electromagnet overlap when viewed in a cylinder line direction. 
   
   
       10 . The engine electromagnetic valve operating device according to  claim 7  or  claim 8 , wherein a guide rod having one end pivotably supported on the lever of the armature and having a first spring seat provided at the other end runs through a second spring seat provided in the lever of said one electromagnet, and one end and the other end of the second valve spring supported on the outer periphery of the guide rod abut against the first spring seat and the second spring seat respectively. 
   
   
       11 . The engine electromagnetic valve operating device according to  claim 8  or  claim 9 , wherein an actuator making said one electromagnet swing drives the other end side of the electromagnet. 
   
   
       12 . The engine electromagnetic valve operating device according to  claim 3 , wherein the armature is pivotably supported via the fixed shaft. 
   
   
       13 . The engine electromagnetic valve operating device according to  claim 4 , wherein the armature is pivotably supported via the fixed shaft. 
   
   
       14 . The engine electromagnetic valve operating device according to  claim 10 , wherein an actuator making said one electromagnet swing drives the other end side of the electromagnet.