Patent ID: 8820280
Filing Date: 2014-09-02
Classification: F01L,F01M

Abstract:
1. A variable cam timing phaser for an internal combustion engine including a housing assembly with an outer circumference for accepting drive force and a rotor assembly coaxially located within the housing for connection to a camshaft, having a plurality of vanes, wherein the housing assembly and the rotor assembly define at least one chamber separated by a vane into an advance chamber and a retard chamber, the vane within the chamber acting to shift relative angular position of the housing assembly and the rotor assembly when fluid is supplied to the advance chamber or the retard chamber, the phaser comprising: a control valve for directing fluid from a fluid input to and from the advance chamber and the retard chamber through an advance line, a retard line, a supply line coupled to the fluid input, and at least one exhaust line, and the control valve being movable between a default mode and an oil pressure actuated mode comprising: an advance mode in which fluid is routed from the fluid input to the advance chamber and fluid is routed from the retard chamber to the exhaust lines, a retard mode in which fluid is routed from the fluid input to the retard chamber and fluid is routed from the advance chamber to the exhaust lines, a holding position in which fluid is routed to the advance chamber and the retard chamber; wherein when the control valve is in the default mode, the control valve blocks the at least one exhaust line, retaining fluid within the advance chamber and retard chamber.