Eccentric planetary traction drive transmission with a single planetary roller
AssigneeThe Timken Company
InventorXiaolan Ai
Life of this patent
Estimating the term…
Abstract
An eccentric planetary traction drive transmission in which a planetary roller is positioned between and in contact with an outer ring member and a sun roller member. Rotation of either the outer ring member or the sun roller member wedges the planetary roller within a convergent gap which squeezes the planetary roller between the outer ring member and the sun roll member. Friction between the planetary roller, the sun roller member, and the outer ring member transmits rotational motion and torque between the outer ring member and the sun roller member. An internal carrier with a plurality of bearings supports the sun roller member within the outer ring member.
Claims17
A planetary traction drive transmission comprising:
- a carrier member;
- an outer ring member, the outer ring member being supported by the carrier member;
- a sun roller member eccentric to the outer ring member, the sun roller member being supported by the carrier member;
- and
- a planetary roller positioned between and in frictional contact with both the outer ring member and the sun roller member such as to communicate rotational motion between the outer ring member and the sun roller member and effectively change the geometry coefficient μG as loads increase.
A method of transmitting rotational motion and torque comprising the steps of:
- installing a sun roller member into an outer ring member such that the sun roller member is eccentric to the outer ring member and a wedge gap is formed between the sun roller member and the outer ring member;
- manufacturing a planetary roller member from one of either a material or a combination of materials having sufficient flexibility to create frictional self-loading and necessary damping between the planetary roller and the outer ring member, and the planetary roller and the sun roller member;
- installing the planetary roller member into the wedge gap such that the planetary roller member is between and in contact with the sun roller member and the outer ring member;
- and
- wedging the planetary roller member between the outer ring member and the sun roller member by rotation of at least one of either the sun roller member or the outer ring member such that rotation and torque is transmitted from the outer ring member and the sun roller member.
Dependencies are inferred from the claim text.