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A planetary traction drive transmission has a sun roller provided with two inner raceways which are presented outwardly and taper downwardly away from each other. It also has two outer rings located within a housing, with the rings surrounding the sun roller and having tapered raceways presented inw

A planetary traction drive transmission has a sun roller provided with two inner raceways which are presented outwardly and taper downwardly away from each other. It also has two outer rings located within a housing, with the rings surrounding the sun roller and having tapered raceways presented inwardly toward the tapered raceways of the sun roller. In addition the transmission has planet rollers which are organized in two rows, there being a separate row within each ring. The rollers have tapered side faces along which they contact the raceways of the sun roller and the rings. They are also organized in pairs, with a roller of each row forming a pair. The rollers of a pair contact each other at beveled end faces on the rollers, and thus each roller of the pair serves to back and axially position the other roller of the pair. At all lines of contact between the rollers and the raceways and between the rollers themselves pure rolling contact, characterized by the absence of spinning, exists. In one embodiment the raceways of the sun roller are locked together and relative rotation occurs between the outer rings. In another embodiment the outer rings are locked together and relative rotation occurs between the raceways of the sun roller. Each embodiment provides high speed and torque ratios in a very compact package.

대표청구항 ▼

1. A traction drive transmission which is organized about a center axis, said transmission comprising: a sun roller; first and second inner raceways mounted on the sun roller and being tapered such that their large diameter ends are presented toward each other; first and second outer raceways tapere

1. A traction drive transmission which is organized about a center axis, said transmission comprising: a sun roller; first and second inner raceways mounted on the sun roller and being tapered such that their large diameter ends are presented toward each other; first and second outer raceways tapered such that their large diameter ends are presented toward each other, the first outer raceway being located around the first inner raceway and the second outer raceway being located around the second inner raceway, one of the first raceways being rotatable relative to its corresponding second raceway and the other of the first raceways being generally locked with respect to its corresponding second raceway; first planet rollers arranged in a row between the first raceways and having tapered side faces which contact the first inner and outer raceways and second planet rollers arranged in a row between the second raceways and having tapered side faces that contact the second inner and outer raceways, the first and second planet rollers being arranged in pairs, with the first planet roller of any pair backing and serving to axially position the second backing roller of the pair and vice versa; and a carrier connected to the first and second planet rollers.