Systems and methods for variable compression ratio phaser having a dual torsion spring arrangement

A phasing system for varying a rotational relationship between a first rotary component and a second rotary component, the phasing system comprising:

• a gear hub;
• a cradle rotor;
• a spider rotor arranged between the gear hub and the cradle rotor, the spider rotor being configured to selectively lock and unlock relative rotation between the gear hub and the cradle rotor;
• a first torsion spring and a second torsion spring coupled between the gear hub and the cradle rotor, wherein the first torsion spring is configured to apply a first torque load between the gear hub and the cradle rotor;
• and
• a planetary actuator coupled to the gear hub and the spider rotor, the planetary actuator being operable between a steady-state mode where relative rotation between the gear hub and the cradle rotor is inhibited, and a phasing mode where the planetary actuator receives a rotary input at a predetermined magnitude to selectively provide a relative rotation between the gear hub and the cradle rotor.

A variable compression ratio (VCR) phasing system for varying a rotational relationship between a crank shaft and an eccentric shaft, the VCR phasing system comprising:

• a gear hub configured to be in rotational communication with a crank shaft;
• a cradle rotor configured to be in rotational communication with an eccentric shaft;
• a spider rotor arranged between the gear hub and the cradle rotor, the spider rotor being configured to receive an input to selectively lock and unlock relative rotation between the gear hub and the cradle rotor;
• a spring sleeve coupled to and rotationally fixed with the gear hub;
• and
• a first torsion spring coupled between the gear hub and the cradle rotor and a second torsion spring coupled between the gear hub and the cradle rotor, wherein the first and second torsion springs are configured to apply a combined torque load between the gear hub and the cradle rotor,
• wherein a preload of the first and second torsion springs is configured to be set by:
• coupling first ends of the first and second torsion springs to the cradle rotor;
• coupling opposing second ends of the first and second torsion springs to a spring seat;
• and
• rotating the spring seat relative to the spring sleeve to selectively align at least one first slot among a plurality of first slots arranged on the spring sleeve with at least one second slot among a plurality of second slots arranged on the spring seat,
• wherein the selective alignment of the at least one first slot and the at least one second slot is configured to rotationally lock the spring sleeve to the spring seat.