System for manipulating a continuously variable transmission
View Patent ↗A shifter for use with a continuously variable transmission includes a grip portion and a hub portion. Specifically, the shifter is designed for use on a bicycle, but could also be used with any light vehicle. The grip portion is characterized by a rotatable adjuster that is coupled to a cable. The cable is also coupled to a hub portion. As the adjuster is rotated, the cable is pulled, in turn rotating a pulley assembly in the hub portion. As the pulley assembly is rotated, it advances a rod within a continuously variable transmission. The rod adjusts the power adjusters as described above. The grip portion is also unique in its display of information to the rider. The grip portion includes a display showing the ratio of input to output. The display also includes a filament that curves as the ration is adjusted. A high ratio renders the filament flat while the filament takes on a steep curve as the ratio is adjusted to make riding up hills easier.
1. A shifter for use with a continuously variable transmission (CVT) having a plurality of power adjusters, each provided with a tiltable axis of rotation, the shifter comprising:
a grip portion having a display;
a hub portion coupled to the grip portion by at least one cable; wherein the grip can be rotated to adjust a pulley located in the hub;
wherein the display has a filament that is moveable from a first position to a second position, the filament comprising a flexible member; and
wherein the grip portion further comprises:
an inner case;
a grip pulley engaged over the inner case, wherein the grip pulley is rotatable around the inner case; wherein the grip pulley has a geared portion; and
a lead screw also having a geared portion for mating with the grip pulley;
wherein the filament is coupled to the lead screw by a following nut.
2. The shifter of claim 1 wherein the grip portion comprises an adjuster coupled to the cable, wherein the adjuster can be rotated to adjust the tension on the cable.
3. The shifter of claim 1 wherein the hub comprises a case, wherein the pulley located in the hub is located within the case.
4. The shifter of claim 3 wherein an adjustment in a tension on the at least one cable rotates the pulley in the hub.
5. The shifter of claim 1 wherein an adjustment of the shifter further adjusts a ratio between an input force and an output force.
6. The shifter of claim 1 wherein the filament has a first end coupled to the nut and a second end coupled to the inner case, so that a movement of the nut produces flexion in the filament.
7. The shifter of claim 1 wherein the grip pulley further comprises a helical groove for cable take-up.
8. The shifter of claim 1 wherein the grip pulley further comprises a cable capture slot for coupling the at least one cable to the grip pulley.
9. The shifter of claim 1 further comprises a top case for covering the indicator.
10. The shifter of claim 1 further comprises a scale for indicating a relative adjustment.
11. The shifter of claim 1 comprises a hub interface back plate that can be positioned at various angles to a vehicle frame while also being rotationally anchored to the vehicle frame.
12. A shifter for use with a CVT on a bicycle comprising:
a grip portion located on a handlebar for the bicycle;
a hub portion coupled to the bicycle adjacent to a rear axle of a rear wheel;
a first cable coupled to the grip portion, the first cable coupled to the hub portion;
a second cable coupled to the grip portion, the second cable coupled to the hub portion; and
wherein the grip portion comprises:
an inner case;
a grip pulley engaged over the inner case, wherein the grip pulley is rotatable around the inner case; wherein the grip pulley has a geared portion;
a lead screw also having a geared portion for mating with the grip pulley; and
an indicator coupled to the lead screw by a following nut.
13. The shifter of claim 12 , wherein the indicator comprises a filament that is moveable from a first position to a second position.
14. The shifter of claim 12 wherein the hub comprises a case and a pulley assembly within the case, wherein rotation of the pulley assembly produces an axial translation of a rod coupled to the pulley assembly.