Continuously variable transmission
First Claim
1. A shifter for facilitating the adjustment of a transmission ratio of a continuously variable transmission (CVT) having a plurality of shift pins, the shifter comprising:
- a shift screw having a first set of threads and a surface for engaging a shifter actuator;
a shift pin hub having a second set of threads and a plurality of fingers, the fingers configured to engage the plurality of shift pins, wherein the first and second set of threads are configured such that a rotation of the shift screw causes an axial translation of the shift pin hub; and
a pivot arm assembly coupled to the shift pin hub, wherein the pivot arm assembly comprisesa substantially u-shaped body having one or more pivot arms, wherein distal ends of the pivot arms are configured to receive ends of a traction planet axle,a slot configured to receive at least one of the plurality of fingers of the shift pin hub to form a slotted joint, anda through hole in the u-shaped body receiving one of the plurality of shift pins.
8 Assignments
0 Petitions
Accused Products
Abstract
Traction planets and traction rings can be operationally coupled to a planetary gearset to provide a continuously variable transmission (CVT). The CVT can be used in a bicycle. In one embodiment, the CVT is mounted on the frame of the bicycle at a location forward of the rear wheel hub of the bicycle. In one embodiment, the CVT is mounted on and supported by members of the bicycle frame such that the CVT is coaxial with the crankshaft of the bicycle. The crankshaft is configured to drive elements of the planetary gearset, which are configured to operationally drive the traction rings and the traction planets. Inventive component and subassemblies for such a CVT are disclosed. A shifting mechanism includes a plurality of pivot arms arranged to pivot about the centers of the traction planets as a shift pin hub moves axially.
417 Citations
17 Claims
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1. A shifter for facilitating the adjustment of a transmission ratio of a continuously variable transmission (CVT) having a plurality of shift pins, the shifter comprising:
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a shift screw having a first set of threads and a surface for engaging a shifter actuator; a shift pin hub having a second set of threads and a plurality of fingers, the fingers configured to engage the plurality of shift pins, wherein the first and second set of threads are configured such that a rotation of the shift screw causes an axial translation of the shift pin hub; and a pivot arm assembly coupled to the shift pin hub, wherein the pivot arm assembly comprises a substantially u-shaped body having one or more pivot arms, wherein distal ends of the pivot arms are configured to receive ends of a traction planet axle, a slot configured to receive at least one of the plurality of fingers of the shift pin hub to form a slotted joint, and a through hole in the u-shaped body receiving one of the plurality of shift pins. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification