Valve timing adjuster

A valve timing adjuster that adjusts opening and closing timing of at least one of an intake valve and an exhaust valve of an internal combustion engine and is placed in a drive force transmission system, which transmits a drive force from a drive shaft of the internal combustion engine to a driven shaft that drives the at least one of the intake valve and the exhaust valve to open and close the same, the valve timing adjuster comprising:

• a first rotatable body that is rotated together with the drive shaft;
• a second rotatable body that is rotated together with the driven shaft, wherein the second rotatable body cooperates with the first rotatable body to form an advancing chamber and a retarding chamber, which are arranged one after another in a rotational direction between the first rotatable body and the second rotatable body, and the second rotatable body drives the driven shaft in an advancing direction or a retarding direction relative to the drive shaft upon supplying of working fluid to the advancing chamber or the retarding chamber;
• and
• a supply control means for controlling supply of the working fluid to the advancing chamber and the retarding chamber, wherein the supply control means alternately and repeatedly implements an advancing supply period, during which the working fluid is supplied to the advancing chamber, and a retarding supply period, during which the working fluid is supplied to the retarding chamber, at time of limiting a phase of the driven shaft relative to the drive shaft within a target phase range.