| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent generation of heat due to friction in a variable phase device of an automobile engine. <P>SOLUTION: The variable phase device for varying the opening/closing timing of an intake valve or an exhaust valve of the engine (110), includes an electromagnetic clutch (42) for decelerating or accelerating a rotary drum. A plurality of magnets that are radially magnetized are fixed to the rotary drum. The magnets are respectively magnetized reversely to the adjacent magnets. The electromagnetic clutch includes an iron core having a plurality of magnetizing parts facing the magnetic poles of the magnets and a coil (120) wound around the iron core. A controller (102) and a coil driving circuit (104) control the direction and ON/OFF of the current supplied to the coil, based on a magnetic signal (c) transmitted from a magnetic sensor (108) for detecting the magnetic poles of the magnets, and a crank angle signal (a) and a cam angle signal (b) transmitted from the engine. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
