Driven clutch with dual helix assembly for continuously variable transmission

A driven clutch for a continuously variable transmission, the driven clutch comprising:

• a first sheave configured to rotate together with a shaft about a sheave axis;
• a roller coupled to the first sheave, the roller being rotatable relative to the first sheave about a roller axis;
• a second sheave coupled to the first sheave, the second sheave being translatable relative to the first sheave along the sheave axis, and the second sheave being rotatable relative to the first sheave about the sheave axis;
• an engine braking helix coupled to the second sheave, the engine braking helix comprising an engine braking ramp extending helically in a first ramp direction relative to the sheave axis;
• an acceleration helix coupled to the second sheave and configured to be rotated relative to the engine braking helix, the acceleration helix comprising an acceleration ramp extending helically in a second ramp direction relative to the sheave axis, the second ramp direction being opposite the first ramp direction;
• and
• wherein (1) when torque is applied to the first sheave and the second sheave in an acceleration direction, the acceleration helix is secured to and rotates together with the second sheave and the roller contacts the acceleration ramp to urge the second sheave toward the first sheave, and (2) when torque is applied to the first sheave and the second sheave in an engine braking direction opposite the acceleration direction, the engine braking helix is secured to and rotates together with the second sheave and the roller contacts the engine braking ramp to urge the second sheave toward the first sheave.

A driven clutch for a continuously variable transmission, the driven clutch comprising:

• a first sheave configured rotate together with a shaft about a sheave axis;
• a second sheave coupled to the first sheave, the second sheave being translatable and rotatable relative to the first sheave;
• a drive protrusion coupled to the second sheave;
• a first helix coupled to the second sheave, the first helix comprising a first ramp extending helically in a first ramp direction relative to the sheave axis;
• and
• a second helix coupled to the second sheave and configured to be rotated relative to the first helix, the second helix comprising a second ramp extending helically in a second ramp direction relative to the sheave axis, the second ramp direction being opposite the first ramp direction;
• wherein (1) when torque is applied to the first sheave and the second sheave in a first torque direction, the drive protrusion secures the first helix to the second sheave and causes the first helix to rotate together with the second sheave, and the second helix is rotatable relative to the second sheave, and (2) when torque is applied to the first sheave and the second sheave in a second torque direction opposite the first torque direction, the drive protrusion secures the second helix to the second sheave and causes the second helix to rotate together with the second sheave, and the first helix is rotatable relative to the second sheave.