Patent ID: 6948467

Claim:
A locking pin mechanism for variably locking together a rotor and a stator in a vane-type camshaft phaser having a rear cover plate and a front cover plate secured to the stator and enclosing the rotor within the stator, the phaser including means for supplying phase-advance oil and phase-retard oil to respective advance and retard chambers formed between the rotor and stator, the locking pin mechanism comprising: a) a straight-sided locking pin disposed in an axial bore in said rotor; b) a well formed in said front cover plate for receiving a portion of said locking pin in locking mode; c) means for directing said phase-advance oil to said pin for urging said pin from said well, wherein said means for directing said phase-advance oil includes a first channel connecting said well to a supply of said phase-advance oil; and d) means for directing said phase-retard oil to said pin for urging said pin from said well, wherein said means for directing said phase-retard oil includes a second channel connecting said well to a supply of said phase-retard oil, and wherein the cross-sectional area of said first and second channels are different.