Electromotive device for operating gas exchange valves

Abstract

The invention relates to an electromotive device for operating gas exchange valves on internal combustion engines, comprising a rotary actuator exerting forces on one or more valve stem ends of one or more gas exchange valves by means of a lever arrangement. The rotary actuator is a reluctance motor with a cylindrical iron rotor with permanent magnet segments of alternating magnetisation arranged on the circumference thereof. The average angular separation of the poles of the stator of the reluctance motor are approximately equal to the average angular separation of the permanent magnet segments on the rotor. The valve shaft ends operated by the lever arrangement preferably belong to gas exchange valves of a cylinder of an internal combustion engine the opening times of which do not coincide or belong to gas exchange valves on different cylinders. The reluctance motor preferably has a single-phase design. The device permits a valve clearance adjustment of the gas exchange valves by control of the actuator current and carrying out part lifts. The electromotive device for operating gas exchange valves is space-saving, low in energy consumption and wear and self-retaining in certain working positions.

1 - 10 . (canceled) 
   
   
       11 . An electromotive device for actuating gas exchange valves in internal combustion engines, comprising
 a rotary actuator,   a lever arrangement ( 8 ;  14 ),   one or more gas exchange valves ( 12 ;  18 ), the one or more gas exchange valves having two or more valve shaft ends ( 9 ;  15 ),   wherein the rotary actuator applies via the lever arrangement ( 8 ;  14 ) forces to the one or alternatingly two or more valve shafts end/s ( 9 ;  15 ) of one or more gas exchange valve/s ( 12 ;  18 ),   wherein the rotary actuator is implemented as a reluctance motor ( 1 ) having a cylindrical iron rotor ( 2 ) and wherein on the periphery there are arranged alternatingly magnetized permanent magnet segments ( 3 ).   
   
   
       2 . The electromotive device for actuating gas exchange valves according to claim  1 , wherein the reluctance motor ( 1 ) comprised a stator ( 4 ) and wherein an average angular separation of poles ( 5 ) of the stator ( 4 ) corresponds approximately to an average angular separation of the permanent magnet segments ( 3 ) of the rotor ( 2 ) of the reluctance motor ( 1 ). 
   
   
       3 . The electromotive device for actuating gas exchange valves according to claim  1 , wherein the valve shaft ends ( 9 ;  15 ) actuated by the lever arrangement ( 8 ;  14 ) are associated with gas exchange valves ( 12 ;  18 ) of a cylinder ( 10 ;  16 ) of an internal combustion engine, wherein the gas exchange valves have non-overlapping opening times. 
   
   
       4 . The electromotive device for actuating gas exchange valves according to claim  1 , wherein the valves shaft ends ( 9 ;  15 ) actuated by the lever arrangement ( 8 ;  14 ) are associated with gas exchange valves ( 12 ;  18 ) of different cylinders ( 10 ;  16 ) of an internal combustion engine. 
   
   
       5 . The electromotive device for actuating gas exchange valves according to claim  1 , wherein the reluctance mode ( 1 ) is implemented in single-phase. 
   
   
       6 . The electromotive device for actuating gas exchange valves according claim  1 , wherein a valve play compensation of the gas exchange valves ( 12 ;  18 ) is attained by controlling the stator current of the reluctance motor ( 1 ). 
   
   
       7 . The electromotive device for actuating gas exchange valves according to claim  1 , wherein the gas exchange vows ( 12 ;  18 ) to be operated perform partial strokes. 
   
   
       8 . The electromotive device for actuating gas exchange valves according to claim  1 , wherein the rotary actuator is arranged perpendicular to the longitudinal axis of the internal combustion engine whose gas exchange valves ( 12 ;  18 ) are actuated. 
   
   
       9 . Method for using of several electromotive devices according to claim  1 , comprising the steps of
 providing a lever arrangement ( 8 ;  14 ) comprising additional connecting elements,   allowing actuation of several valve shaft ends ( 9 ;  15 ), and   arranging the rotary actuator perpendicular to the longitudinal axis of the internal combustion engine whose gas exchange valves ( 12 ;  18 ) are actuated, and   reluctance motor ( 1 ) actuating the gas exchange valves of multi-cylinder internal combustion engines in a space-saving manner.