Patent ID: 7866291

Claim:
A camshaft phaser for an internal combustion engine, comprising: a driven hub attached to a camshaft; a drive sprocket journaled to said driven hub, with said drive sprocket being rotatably indexable relative to said driven hub; and a locking device for selectively indexing the drive sprocket to the driven hub, with said locking device comprising: a locking pin housed reciprocably in a pin bore formed in one of said driven hub and said drive sprocket; at least one pin receptacle formed in the other of said driven hub and said drive sprocket at a location accessible to said locking pin when said locking pin is extended from the pin bore, with said pin receptacle comprising: a locking bore having a section configuration generally matching the section configuration of said locking pin; and an engagement ramp contiguous with said locking bore for allowing the locking pin to extend partially from said pin bore before, the locking pin is registered with the locking bore.