Patent ID: 8397687

Claim:
A camshaft phaser for controllably varying the phase relationship between a crankshaft and a camshaft in an 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 and 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 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 a 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 control valve to said advance chambers; and a retard passage for selectively communicating pressurized oil from said control valve to said retard chambers.