Hydraulically actuated camshaft phasers for concentrically arranged camshafts

A camshaft phaser assembly, comprising:

• an axis of rotation;
• a first hydraulic camshaft phaser including:
• a first stator arranged to receive rotational torque and including a plurality of radially inwardly extending protrusions;
• a first rotor including a plurality of radially outwardly extending protrusions circumferentially interleaved with the plurality of radially inwardly extending protrusions;
• and,
• a plurality of phaser chambers, each phaser chamber circumferentially bounded by:
• a respective radially inwardly extending protrusion included in the plurality of radially inwardly extending protrusions;
• and,
• a respective radially outwardly extending protrusion included in the plurality of radially outwardly extending protrusions;
• a second hydraulic camshaft phaser including:
• a second stator non-rotatably connected to the first stator;
• and,
• a second rotor;
• a cap including a first through-bore;
• a first bolt arranged to non-rotatably connect the first rotor and the cap to a first camshaft;
• a first fluid chamber:
• bounded in part by the cap;
• directly connected to the first through-bore;
• and,
• in fluid communication with a first phaser chamber included in the plurality of phaser chambers;
• and,
• a second fluid chamber:
• bounded in part by the cap;
• and,
• in fluid communication with a second phaser chamber, circumferentially adjacent to the first phaser chamber, included in the plurality of phaser chambers.

A camshaft phaser assembly, comprising:

• an axis of rotation;
• a first hydraulic camshaft phaser including:
• a first stator arranged to receive rotational torque and including a first plurality of radially inwardly extending protrusions;
• a first rotor including a first plurality of radially outwardly extending protrusions circumferentially interleaved with the plurality of radially inwardly extending protrusions;
• and,
• a first plurality of phaser chambers circumferentially bounded by the first plurality of radially inwardly extending protrusions and the first plurality of radially outwardly extending protrusions;
• a second hydraulic camshaft phaser including:
• a second stator arranged to receive the rotational torque and including a second plurality of radially inwardly extending protrusions;
• a second rotor including a second plurality of radially outwardly extending protrusions circumferentially interleaved with the second plurality of radially inwardly extending protrusions;
• and,
• a second plurality of phaser chambers circumferentially bounded by the second plurality of radially inwardly extending protrusions and the second plurality of radially outwardly extending protrusions;
• a first target wheel:
• non-rotatably connected to the first rotor;
• and,
• arranged to determine a circumferential position of the first rotor for use in rotating the first rotor with respect to the first stator;
• and,
• a second target wheel:
• non--rotatably connected to the second rotor;
• and,
• arranged to determine a circumferential position of the second rotor for use in rotating the second rotor with respect to the second stator, wherein the first hydraulic camshaft phaser and the second hydraulic cam shaft phaser are located between the first target wheel and the second target wheel in an axial direction parallel to the axis of rotation.