US 12,146,568 B1
Driven clutch with dual helix assembly for continuously variable transmission
Tyler Henssler Stoltzfus, Nichols, NY (US)
Assigned to The Hilliard Corporation, Elmira, NY (US)
Filed by The Hilliard Corporation, Elmira, NY (US)
Filed on Nov. 29, 2023, as Appl. No. 18/523,625.
Int. Cl. F16H 61/662 (2006.01); F16H 55/56 (2006.01); F16H 61/66 (2006.01)
CPC F16H 61/66272 (2013.01) [F16H 55/56 (2013.01); F16H 2061/661 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A driven clutch for a continuously variable transmission comprising a belt, the driven clutch comprising:
a first sheave configured to rotate together with a shaft about a sheave axis;
a roller coupled to and being rotatable relative to the first sheave;
a second sheave coupled to the first sheave, the second sheave being translatable and rotatable relative to the first sheave;
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 to the sheave axis, the second ramp direction being opposite the first ramp direction; and
wherein (1) when the belt applies torque 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 pinch the belt between the first sheave and the second sheave, and (2) when the belt applies torque 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 pinch the belt between the first sheave and the second sheave.