Traction drive transmission

Details Traction drive transmission Traction drive transmission

1999-02-12

2000-08-01

Wright, Dirk

Planetary gear transmission systems or components

Planet pinion is friction gear

Planet pinion rotatable about axis at angle to axis of input...

F16H 1308

Patent

active

060959401

ABSTRACT:
A planetary traction drive transmission has an inner shaft provided with two inner raceways which are presented outwardly and taper downwardly away from each other and an outer ring having two outer raceways which are presented inwardly, surround the inner raceways, and likewise taper downwardly away from each other. In addition, the transmission has tapered rollers arranged in two rows between the opposing inner and outer races. The rollers of each row are on apex and in line contact with the inner and outer raceways between which they are located. Moreover, they are arranged in pairs, with the rollers of each pair being generally aligned and backing each other. Indeed, at their large ends the rollers have conical end faces, and the rollers in each pair contact each other along those conical end faces, there being line contact here as well. In addition, the transmission has a roller carrier provided with axles which extend into the rollers, so that the rollers revolve about and are maintained in position by the axles. Pure rolling contact characterized by the absence of spinning exists between the rollers and the raceways and also between the large end faces of corresponding rollers in the two rows.

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Loewenthal, S; A Historical Perspective of Traction Drives and Related Technology; NASA Lewis Research Center; pp. 79 and 87.
Loewenthal, S. and Zaretsky, E; Design of Traction Drives; NASA Reference Publication 1154; 1985, title page and pp. 6 and 7.

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