Continuously and/or infinitely variable transmissions and methods therefor
View Patent ↗An infinitely variable transmission (IVT) having a rotatable input shaft arranged along a longitudinal axis of the transmission. In one embodiment, the input shaft is adapted to supply a lubricant to the interior of the transmission. In some embodiments, a stator assembly is coupled to, and coaxial with, the input shaft. The IVT has a plurality of planets operably coupled to the stator assembly. The planets are arranged angularly about the longitudinal axis of the transmission. In one embodiment, a traction ring is operably coupled to the planets. The IVT is provided with a housing that is operably coupled to the traction ring. The housing is substantially fixed from rotating with the input shaft. The traction ring is substantially fixed from rotating with the input shaft. In some embodiments, the IVT is provided with a lubricant manifold that is configured to supply a lubricant to the input shaft.
1. An infinitely variable transmission comprising:
a rotatable input shaft arranged along a longitudinal axis of the transmission, the input shaft having an elongated tubular body with a central bore and an opening, wherein the elongated tubular body and the opening define a lubricant passage from an exterior surface to the interior of the transmission;
a stator assembly coupled to, and coaxial with, the input shaft;
a plurality of planets operably coupled to the stator assembly, wherein the plurality of planets are arranged angularly about the longitudinal axis of the transmission;
a traction ring operably coupled to the plurality of planets, wherein the traction ring is substantially fixed from rotating with the input shaft; and
a housing operably coupled to the traction ring, wherein the housing is substantially fixed from rotating with the input shaft.
2. The infinitely variable transmission of claim 1 , wherein the opening is proximate a shift-cam-and-sun subassembly.
3. The infinitely variable transmission of claim 1 , wherein the opening is proximate a planet-and-shift-lever subassembly.
4. The infinitely variable transmission of claim 1 , further comprising a lubricant manifold configured to supply a lubricant to the input shaft.
5. The infinitely variable transmission of claim 1 , further comprising a load cam ring coaxial with the plurality of planets, the load cam ring comprising:
a substantially annular ring having a front face and a rear face;
a plurality of bi-directional ramps located on the front face of the load cam ring, wherein the cross-section of the ramps is curved; and
a plurality of engagement features located on the rear face of the load cam ring.
6. The infinitely variable transmission of claim 5 , further comprising a plurality of load cam rollers coupled to the load cam ring.
7. The infinitely variable transmission of claim 1 , further comprising a shift rod coupled to the input shaft.
8. The infinitely variable transmission of claim 7 , wherein the shift rod is disposed in the central bore of the input shaft.
9. The infinitely variable transmission of claim 7 , wherein the shift rod comprises a central bore that forms a portion of the lubricant passage to supply a lubricant to the interior of the transmission.
10. A method for lubricating internal components of a transmission having a plurality of planets operably coupled to a stator assembly and a traction ring operably coupled to the planets, the method comprising:
providing a lubricant manifold configured to cooperate with a lubricant source;
coupling a main axle of the transmission to the lubricant manifold, the main axle comprising an elongated tubular body having a central bore and an opening, wherein the main axle is adapted to receive a rotational power, wherein the central bore and the opening form a portion of a lubricant passage;
providing a shift rod arranged in the central bore of the main axle, the shift rod having a central bore;
supplying a lubricant via the lubricant manifold to the main axle;
delivering the lubricant via the main axle lubricant passage to the shift rod;
providing a housing operably coupled to the traction ring, wherein the housing is substantially fixed from rotating with the main axle; and
adapting the traction ring to be substantially fixed from rotating with the main axle.
11. The method of claim 10 , further comprising supplying a pressurized lubricant from the lubricant source.
12. The method of claim 10 , further comprising delivering the lubricant through the main axle lubricant passage to the interior of the transmission.
13. The method of claim 10 , wherein the opening is proximate a shift-cam-and-sun subassembly.
14. The method of claim 10 , wherein the opening is proximate a planet-and-shift-lever subassembly.
15. An infinitely variable transmission comprising:
a lubricant manifold configured to cooperate with a lubricant source;
a rotatable input shaft arranged along a longitudinal axis of the transmission, the input shaft comprising an elongated tubular body having a central bore in fluid communication with the lubricant manifold and an opening to supply a lubricant to the interior of the transmission, wherein the central bore and the opening form a portion of a lubricant passage;
a stator assembly coupled to, and coaxial with, the input shaft;
a plurality of planets operably coupled to the stator assembly, wherein the plurality of planets are arranged angularly about the longitudinal axis of the transmission;
a traction ring operably coupled to the plurality of planets, wherein the traction ring is substantially fixed from rotating with the input shaft; and
a housing operably coupled to the traction ring, wherein the housing is substantially fixed from rotating with the input shaft.
16. The infinitely variable transmission of claim 15 , wherein the lubricant source is pressurized.
17. The infinitely variable transmission of claim 15 , wherein the opening is proximate a shift-cam-and-sun subassembly.
18. The infinitely variable transmission of claim 15 , wherein the opening is proximate a planet-and-shift-lever subassembly.