| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a joint device of a rotation transmission device which is excellent in the durability and the operation responsiveness, capable of saving the power, and capable of securing high reliability even when being applied to a valve timing variable device of an engine for automobile. SOLUTION: A joint device which connect a driving side member 24 and a driven side member 2 of a rotation transmission member divided into the driving side member 24 and the driven side member 2 are coupled to each other in an integratedly rotatable manner with the magnetic force, is provided with a holding means which holds the relative position in the rotational direction of the driving side member 24 to the driven side member 2 by the attraction force by the magnetic field of a permanent magnet 6 in an integratedly rotatable manner, and a releasing means 13 which is arranged close to the holding means and generates the magnetic field in the direction to weaken the magnetic field of the permanent magnet 6. The phase between the driving side member 24 and the driven side member 2 is kept by the attraction force by the magnetic field of the permanent magnet 6, and in changing the phase, the magnetic field of the permanent magnet 6 is weakened by the magnetic field of the releasing means 13 to reduce the phase keeping force.</p> |
