Continuously variable transmission
View Patent ↗Inventive embodiments are directed to components, subassemblies, systems, and/or methods for continuously variable accessory drives (CVAD). In one embodiment, a skew-based control system is adapted to facilitate a change in the ratio of a CVAD. In another embodiment, a skew-based control system includes a skew actuator coupled to a carrier member. In some embodiments, the skew actuator is configured to rotate a carrier member of a CVT. Various inventive traction planet assemblies can be used to facilitate shifting the ratio of a CVT. In some embodiments, the traction planet assemblies include legs configured to cooperate with the carrier members. In some embodiments, a traction planet assembly is operably coupled to the carrier members. Embodiments of a shift cam and a traction sun are adapted to cooperate with other components of the CVT to support operation and/or functionality of the CVT. Among other things, shift control interfaces for a CVT are disclosed.
1. A continuously variable accessory drive (CVAD) comprising:
a continuously variable transmission (CVT) coupled to an accessory device and having a longitudinal axis, the CVT comprising:
a plurality of traction planets, each traction planet adapted to rotate about a tiltable axis;
a first carrier member comprising a plurality of radially offset slots formed in the first carrier member and arranged angularly about the longitudinal axis;
a second carrier member comprising a plurality of radial slots formed in the second carrier member and arranged angularly about the longitudinal axis, the second carrier member being coupled to the first carrier member, the first and second carrier members operably coupled to each traction planet, wherein the first carrier member is configured to rotate relative to the second carrier member about the longitudinal axis; and
a skew actuator operably coupled to the CVT, the skew actuator adapted to apply a skew condition to the CVT to tilt the axes of the traction planets.
2. The CVAD of claim 1 , further comprising an output arranged along the longitudinal axis of the CVT, the output configured to couple the CVAD to the accessory device.
3. The CVAD of claim 2 , further comprising an alternator coupled to the output.
4. The CVAD of claim 2 , further comprising a pump coupled to the output.
5. The CVAD of claim 1 , wherein the CVT is configured to receive an input power from a pulley driven by a prime mover.
6. A continuously variable accessory drive (CVAD) comprising:
a plurality of traction planets arranged angularly about a longitudinal axis of the CVAD, the traction planets configured to transfer a power to an accessory device;
a plurality of planet axles, each planet axle operably coupled to each traction planet, each planet axle defining a tiltable axis of rotation for each traction planet, each planet axle configured for angular displacement in a plane perpendicular to the longitudinal axis, each planet axle configured for angular displacement in a plane parallel to the longitudinal axis;
a first carrier member operably coupled to a first end of each planet axle, the first carrier member mounted about the longitudinal axis and comprising a plurality of radially offset slots formed in the first carrier member and arranged angularly about the longitudinal axis;
a second carrier member operably coupled to a second end of each planet axle, the second carrier member mounted about the longitudinal axis and comprising a plurality of radial slots formed in the second carrier member and arranged angularly about the longitudinal axis; and
wherein the first and second carrier members are configured to rotate relative to each other about the longitudinal axis.
7. The CVAD of claim 6 , further comprising a skew actuator operably coupled to at least one of the first and second carrier members.
8. The CVAD of claim 6 , further comprising a skew driver coupled to the first and second carrier members, the skew driver configured to apply relative rotation between the first and second carrier members.
9. The CVAD of claim 8 , wherein the skew driver comprises an eccentric skew cam adapted to couple to at least one of the first and second carrier members.
10. The CVAD of claim 6 , further comprising an output device arranged along the longitudinal axis, the output device configured to transfer power from the CVAD to an accessory device.
11. The CVAD of claim 6 , further comprising a pulley configured to transfer an input power to each of the traction planets.
12. The CVAD of claim 10 , wherein the accessory device is an alternator.
13. The CVAD of claim 10 , wherein the accessory device is a pump.