Patent ID: 9062572
Filing Date: 2015-06-23
Classification: F01L

Abstract:
1. A variable cam phaser for an automobile engine for varying open/close valve timing of the engine, comprising: a drive rotor driven by a crankshaft of the engine; a first and a second control rotor rotatable relative to each other, arranged coaxial with a camshaft of the variable cam phaser and driven by a crankshaft of the engine; a first electromagnetic actuator adapted to provide the first control rotor with a braking torque; a second electromagnetic actuator adapted to provide the second control rotor with a braking torque; and a mechanism for varying a phase angle of the camshaft relative to the crankshaft, thereby varying an open/close valve timing of the engine, wherein the first and the second electromagnetic actuators, when energized, operate simultaneously to render the first and the second rotating control rotors mutually unrotatable, and an electric current to one of the first and the second electromagnetic actuators is reduced to reduce the braking torque of said one electromagnetic actuator in operation, thereby causing one control rotor associated with said one actuator to be accelerated to rotate relative to the other control rotor.