| 摘要 |
A friction drive device has first and second rollers (1, 2), in which the ratio of the transmission power and the pressing power is nearly constant regardless of the magnitude of the transmission power. The rollers (1, 2) have center axes that are spaced apart by prescribed radial distance (r<SUB>0</SUB>), and arranged relative to an x y coordinate system when the rollers (1, 2) are not under load such that the x y coordinate system has an origin corresponding to the center axis of the first roller (1), and the y-axis passes through the center axis of the second roller (2). The cam surface (51) is located in a first quadrant of the x y coordinate system, and has a concave arc with a single radius, such that the concave arc has a cam surface center located in a third quadrant of the x y coordinate system near or on an imaginary arc defined by the prescribed radial distance (r<SUB>0</SUB>). |
