Patent ID: 9127575
Filing Date: 2015-09-08
Classification: F01L

Abstract:
1. 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 lock pin disposed within one of said rotor and said stator for selective engagement with a lock pin seat for substantially preventing relative rotation between said rotor and said 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 from 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 for controlling the flow of oil into and out of said advance and retard chambers, wherein said phase relationship control valve is coaxial with said rotor; and a lock pin control valve for controlling the flow of oil to and from said lock pin, wherein said lock pin control valve is coaxial with said phase relationship control valve; wherein said phase relationship control valve is operational independent of said lock pin control valve.