| 摘要 |
A variable cam timing phaser for an internal combustion engine includes a housing (10) and a rotor (20) connected coaxially with respect to a camshaft for rotation relative to one another. The housing (10) and the rotor (20) can define at least one cavity (10a) with a vane (22) dividing each cavity (10a) into a first chamber (16) and a second chamber (18). A control valve (24) can have a longitudinally reciprocal spool (36). The spool (36) can move between an advance timing position and a retard timing position within a Cam Torque Actuated mode of operation, an advance timing position within a Torsional Assist mode of operation, and at least one null position. The spool (36) can connect the first chamber (16), the second chamber (18), a check valve (40) and an actuating fluid supply source (46) with respect to one another, and can connect a passage (62) associated with a lock pin (60) between an exhaust vent (48a, 48b) and the actuating fluid supply source (46).
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