Dual phasers assembled concentrically on a concentric camshaft system

摘要

A variable cam timing phaser for an internal combustion engine having a concentric camshaft can include a stator (14) having an axis of rotation. An outer rotor (20) can rotate independently relative to the axis of rotation of the stator (14). A combination of an outer vane (22) and cavity (20a) can be associated with the outer rotor (20) to define first and second outer variable volume working chambers (20b, 20c). A radially inner located rotor (30) can rotate relative to the axis of rotation and independently of both the stator (14) and the outer rotor (20). A combination of an inner vane (32) and a cavity (30a) can be associated with the inner rotor (20) to define first and second inner variable volume working chambers (30b, 30c). When the first and second, outer and inner chambers (20b, 30b, 20c, 30c) selectively communicate with a source of pressurized fluid, phase orientation of the outer and inner rotors (20, 30) with respect to one another and with respect to the stator (14) is facilitated.

主权项

1. A variable cam timing phaser (10) for an internal combustion engine having a concentric camshaft (12) comprising:
a stator (14) having an axis of rotation and a wall portion (14a, 14f) connected to the stator (14); an outer rotor (20) rotatable relative to the axis of rotation of the stator (14) independently of the stator (14); a radially outer located vane-type hydraulic coupling (40) including a combination of an outer vane (22) and outer cavity (20a) associated with the outer rotor (20) to define first and second outer variable volume working chambers (20b, 20c); an inner rotor (30) rotatable relative to the axis of rotation of the stator (14) independently of both the stator (14) and the outer rotor (20), the inner rotor located radially inwardly within an innermost periphery of the outer rotor (20), the wall portion (14a, 14f) of the stator (14) radially interposed between the inner rotor (20) and outer rotor (30); a radially inner located vane-type hydraulic coupling (50) including a combination of an inner vane (32) and inner cavity (30a) associated with the inner rotor (30) to define first and second inner variable volume working chambers (30b, 30c); and wherein the first and second, outer and inner, variable volume working chambers (20b, 30b, 20c, 30c), when selectively communicating with a source of pressurized fluid, facilitate angular phase orientation of the outer and inner rotors (20, 30) independently with respect to each other and independently with respect to the stator (14).