Patent ID: 8613266

Claim:
A camshaft phase variable device for an engine, comprising: a drive rotor driven by the crankshaft of the engine; a first intermediate rotor integral with a camshaft; and a first control rotor coaxial with a common rotational axis of, and rotatable relative to, the drive rotor and the first intermediate rotor; and a torque means adapted to provide the first control rotor with a torque so as to vary the phase angle of the camshaft relative to the drive rotor in accordance with the rotations of the first intermediate rotor and the drive rotor, wherein the torque means comprises a first electromagnetic clutch for causing the first control rotor to be rotated relative to the first intermediate rotor and the drive rotor; a second intermediate rotor integral with the camshaft and having a substantially radial guide slit; a second control rotor mounted coaxial with, and rotatable relative to, the first control rotor and second intermediate rotor; a second electromagnetic clutch for rotating the second control rotor; a first eccentric rotary mechanism that is eccentrically rotatable about the rotational axis of the camshaft in conjunction with the first control rotor; a second eccentric rotary mechanism that is eccentrically rotatable about the rotational axis in conjunction with the second control rotor; and coupling means in sliding engagement with the radial guide slit for coupling the first and second eccentric rotary mechanisms mutually rotatable with respect to each other, wherein the first eccentric rotary mechanism comprises a first circular eccentric bore formed in the first control rotor, and a first ring member having an outer circumference in sliding contact with the inner circumference of the first circular eccentric bore; wherein the second eccentric rotary mechanism comprises a second circular eccentric bore formed in the second control rotor, and a second ring member having an outer circumference in sliding contact with the inner circumference of the second circular eccentric bore; wherein the coupling means comprises a first and a second engagement bores formed in the first and second ring members, respectively, and a coupling member passing through the radial guide slit with the opposite ends thereof inserted in the first and second engagement bores, respectively, and wherein the first and second ring members are arranged across a phantom extension line of the radial guide slit.