Infinitely variable transmissions, continuously variable transmissions, methods, assemblies, subassemblies, and components therefor
Inventive embodiments are directed to components, subassemblies, systems, and/or methods for infinitely variable transmissions (IVT). In one embodiment, a control system is adapted to facilitate a change in the ratio of an IVT. In another embodiment, a control system includes a carrier member configured to have a number of radially offset slots. Various inventive carrier members and carrier drivers can be used to facilitate shifting the ratio of an IVT. In some embodiments, the traction planet assemblies include planet axles configured to cooperate with the carrier members. In one embodiment, the carrier member is configured to rotate and apply a skew condition to each of the planet axles. In some embodiments, a carrier member is operably coupled to a carrier driver. In some embodiments, the carrier member is configured to couple to a source of rotational power. Among other things, shift control interfaces for an IVT are disclosed.
1. A shifting mechanism for an infinitely variable transmission (IVT) having a longitudinal axis and a plurality of traction planet assemblies arranged angularly about the longitudinal axis, each traction planet assembly having a tiltable axle, the shifting mechanism comprising:
a first carrier member having a first plurality of guide slots, the first carrier member configured to guide a first end of each tiltable axle of the traction planet assemblies;
a second carrier member having a second plurality of guide slots, the second carrier member configured to guide a second end of each tiltable axle of the traction planet assemblies, wherein the first and second carrier members are rotatable about the longitudinal axis; and
a carrier driver nut coupled to the first carrier member, the carrier driver nut adapted to translate axially to cause a rotation of the first carrier member with respect to the second carrier member.
2. The shifting mechanism of claim 1 , wherein the first plurality of guide slots are offset.
3. The shifting mechanism of claim 2 , further comprising a main shaft positioned along the longitudinal axis.
4. The shifting mechanism of claim 3 , wherein the main shaft is operably coupled to the first and second carrier members.
5. The shifting mechanism of claim 4 , wherein the carrier driver nut is adapted to translate axially along the main shaft.
6. The shifting mechanism of claim 1 , further comprising a shift fork operably coupled to the carrier driver nut, wherein the shift fork has a pivot axis that is offset from the longitudinal axis, wherein a pivoting of the shift fork corresponds to an axial translation of the carrier driver nut.
7. An infinitely variable transmission (IVT) having a main shaft positioned along a longitudinal axis, the IVT comprising:
a plurality of traction planet assemblies arranged angularly about the longitudinal axis, each traction planet assembly having a tiltable axle;
a first carrier member having a first plurality of guide slots, the first carrier member configured to guide a first end of each tiltable axle of the traction planet assemblies;
a second carrier member having a second plurality of guide slots, the second carrier member configured to guide a second end of each tiltable axle of the traction planet assemblies, wherein at least one of the first carrier member and the second carrier member receives a rotational power input from the main shaft, and wherein the first carrier member is capable of rotating with respect to the second carrier member, and
a carrier driver nut coupled to the first carrier member, the carrier driver nut adapted to translate axially, wherein an axial translation of the carrier driver nut corresponds to a rotation of the first carrier member with respect to the second carrier member.
8. The IVT of claim 7 , wherein the main shaft is operably coupled to the first carrier member and the second carrier member.
9. The IVT of claim 8 , wherein the first and second carrier members receive the rotational power from the main shaft.
10. The IVT of claim 7 , wherein the carrier driver nut is adapted to translate axially along the main shaft.
11. The IVT of claim 7 , wherein an axial translation of the carrier driver nut corresponds to a rotation of the carrier driver nut.
12. The IVT of claim 7 , further comprising a first traction ring in contact with the plurality of traction planet assemblies, the first traction ring substantially non-rotatable about the longitudinal axis.
13. The IVT of claim 7 , further comprising a second traction ring in contact with the plurality of traction planet assemblies, the second traction ring adapted to provide a power output.
14. The IVT of claim 13 , further comprising a disengagement mechanism for mechanically decoupling the second traction ring from a load.
15. The IVT of claim 7 , further comprising a shift fork operably coupled to the carrier driver nut, wherein the shift fork has a pivot axis that is offset from the longitudinal axis, wherein a pivoting of the shift fork corresponds to an axial translation of the carrier driver nut.
16. The IVT of claim 15 , wherein the axial translation of the carrier driver nut corresponds to a rotation of the carrier driver nut about the longitudinal axis.
17. The IVT of claim 7 , wherein the first plurality of guide slots are offset.