Patent ID: 9714697
Date: 2017-07-25
CPC Classifications: F16H

Claim:
1. A stepless transmission comprising: a transmission shaft acting as a center of rotation; first to fourth power transmission elements having a first rotation center axis concentrically with the transmission shaft and being relatively rotatable in a circumferential direction mutually; a plurality of rolling bodies having a second rotation center axis, disposed radially about the first rotation center axis on an outer circumferential surface of the third power transmission element, clamped by the first and second power transmission elements disposed in confrontation with each other, and tiltably held by the fourth power transmission element; an axial force generator configured to generate axial force in an axial direction to press at least one of the first and second power transmission elements against the rolling bodies; and a transmission configured to change a gear ratio between an input and output by tilting the rolling bodies, wherein Young's moduli of a contact section and an additional contact section, in contact with the rolling body, of one of the first and second power transmission elements are larger than Young's moduli of a contact section and an additional contact section, in contact with the rolling body, of other one of the first and second power transmission elements, and wherein Young's moduli of a contact section and an additional contact section, in contact with the one of the first and second power transmission elements, of the rolling bodies are larger than Young's moduli of a contact section and an additional contact section in contact with the other one of the first and second power transmission elements, and the Young's moduli of the contact section and the additional contact section in contact with the one of the first and second power transmission elements become larger as a radius of a ring formed by the contact section and the additional contact section becomes smaller.