Check valve for exhausting flow of fluid from a variable cam timing phaser

A variable cam timing phaser mounted to a camshaft, of an internal combustion engine, the variable cam timing phaser comprising:

• a housing having an outer circumference configured to accept a drive force;
• a rotor received by the housing so as to define a chamber separated into an advance chamber and a retard chamber by a vane;
• a control valve comprising:
• a sleeve having a bore and an outer surface receiving a first check valve at a first exhaust port of the control valve and a second check valve at a second exhaust port of the control valve;
• and
• a spool having a plurality of lands slidably received within the bore;
• wherein during a torque reversal of the camshaft, the first check valve and the second check valve prevent air from a sump connected to the first exhaust port and the second exhaust port from being sucked into the advance chamber or the retard chamber through the first exhaust port and the second exhaust port, respectively.

A variable cam timing phaser mounted to a camshaft, of an internal combustion engine, the variable cam timing phaser comprising:

• a housing assembly having an outer circumference configured to accept a drive force;
• a rotor assembly received by the housing assembly so as to define a chamber separated into an advance chamber and a retard chamber by a vane;
• a control valve received in a center bolt housing in the rotor assembly, the control valve in fluid communication with the advance chamber and the retard chamber, a source of fluid, and a sump through at least one exhaust line of the control valve through the center bolt housing,
• the control valve comprising:
• a sleeve having a bore and an outer surface receiving at least one check valve at an exhaust port of the control valve;
• and
• a spool having a plurality of lands slidably received within the bore of the sleeve;
• wherein during a torque reversal of the camshaft, the at least one check valve prevents air from the sump from being sucked into the variable cam timing phaser through the at least one exhaust port line of the control valve.