Patent ID: 6805081
Filing Date: 2004-10-19
Classification: F01L,Y10T

Abstract:
A valve timing control device for an internal combustion engine, comprising:a drive rotary member rotated by a crankshaft of the engine; a driven rotary member to rotate a camshaft of the engine upon rotation of the drive rotary member; a rotational phase control mechanism having an intermediate rotary member rotated relative to the drive and driven rotary members to cause relative rotation between the drive and driven rotary members; and a braking mechanism having a hysteresis brake that generates a braking force to cause the intermediate rotary member to rotate relative to the drive and driven rotary members, the hysteresis brake including: a first member having a hysteresis portion with a magnetic hysteresis characteristic; a second member having a magnetic portion to provide a magnetic field across the hysteresis portion; and a magnetic-field control unit that controls the magnetic field, the first and second members being movable relative to each other to produce the braking force due to the magnetic hysteresis characteristic of the hysteresis portion relative to the magnetic field generated from the magnetic portion.