Patent ID: 8460137

Claim:
A belt-drive continuously variable transmission comprising: a pair of pulleys, each of the pair of pulleys having: (a) a stationary pulley; and (b) a movable pulley that moves toward or away from the stationary pulley in an axial direction of the pulley; a belt wound around the pair of pulleys; and a rotation state detecting device for detecting rotation of one of the pair of pulleys, the rotation state detecting device having: (c) a tone wheel that rotates integrally with the one of the pair of pulleys; and (d) a sensor that faces the tone wheel, the tone wheel having a cylinder portion that extends along a moving direction of the movable pulley and the cylinder portion having a plurality of detection portions at regular intervals along a circumferential direction throughout an entire circumference of the cylinder portion and extending along the moving direction, wherein the cylinder portion is on an outer circumference side of a fluid pressure cylinder of the movable pulley, wherein the cylinder portion and the movable pulley are fixedly connected to each other, wherein the tone wheel has an attachment portion sandwiched and supported between the movable pulley and the fluid pressure cylinder, and wherein the cylinder portion continues from the attachment portion through a bending portion such that a position of the cylinder portion is fixed relative to a position of the attachment portion.