Camshaft phaser with independent phasing and lock pin control

A camshaft phaser for use with an internal combustion engine for controllably varying the phase relationship between a crankshaft and a camshaft in said internal combustion engine, said camshaft phaser comprising:

• a stator having a plurality of lobes and connectable to said crankshaft of said internal combustion engine to provide a fixed ratio of rotation between said stator and said crankshaft;
• a rotor coaxially disposed within said stator, said rotor having a plurality of vanes interspersed with said stator lobes defining alternating advance chambers and retard chambers, wherein said advance chambers receive pressurized oil in order to change the phase relationship between said crankshaft and said camshaft in the advance direction and said retard chambers receive pressurized oil in order to change the phase relationship between said camshaft and said crankshaft in the retard direction, said rotor being attachable to said camshaft of said internal combustion engine to prevent relative rotation between said rotor and said camshaft;
• a lock pin disposed within one of said rotor and said stator for selective engagement with a lock pin seat in the other of said rotor and said stator for preventing a change in phase relationship between said rotor and stator when said lock pin is engaged with said lock pin seat, wherein pressurized oil is selectively supplied to said lock pin in order to disengage said lock pin with said lock pin seat, and wherein oil is selectively vented from said lock pin in order to engage said lock pin with said lock pin seat;
• a phase relationship control valve located coaxially within said rotor for controlling the flow of oil into and out of said advance and retard chambers;
• a first lock pin oil passage for communicating oil to and from said lock pin, wherein said first lock pin oil passage is in fluid communication with a lock pin oil control valve located outside of said camshaft phaser when said camshaft phaser is attached to said internal combustion engine, and wherein said lock pin oil control valve controls the flow of oil to and from said lock pin and is operated independently of said phase relationship control valve
• a bushing adaptor coaxially disposable within a pocket of said camshaft and coaxially disposed within said rotor;
• and
• a camshaft phaser attachment bolt extending coaxially through said bushing adaptor in a close fitting relationship and threadably engageable into said camshaft to attach said camshaft phaser to said camshaft;
• wherein said bushing adaptor defines at least in part:
• a supply passage for communicating pressurized oil from said internal combustion engine to said phase relationship control valve, said supply passage being defined at least in part by a first annular groove formed on the inside surface defining the inside diameter of said bushing adapter;
• an advance passage for selectively communicating pressurized oil from said phase relationship control valve to said advance chambers;
• and
• a retard passage for selectively communicating pressurized oil from said phase relationship control valve to said retard chambers.