To improve lifetime and quality while preventing the unstable abrasion by polishing a conical contact surface of a half pulley of a transmission unit having an outline for lubricating a thin film.
Pulleys 5, 6 positioned on an input shaft 3 and a driven shaft 4 are respectively formed of a conical contact surface 12 and half pulleys 8, 9 and 10, 11, and continuously change the change gear ratio between the input shaft 3 and the driven shaft 4. A transmission element 7 is formed of a lubrication type belt provided with a metal part 13 having a contact surface 14 interlocked with the conical contact surface 12 for operation, and the belt is lubricated by a belt lubricating tube 15 injected onto the transmission 7. A thin film is lubricated by substituting the thin film with an oil film at a specified place on the contact surface 12, and the slip is restricted to the minimum. When a transmission unit 1 is worn, since the only limited abrasion exists on a rib, a stable outline having a height of the rib in relation to the whole lifetime of a continuously variable transmission 2 is left, and a danger to a transmission element 7 to be slipped under the heavy load condition is restricted to the minimum.
DEGEEST DIRK GEERT THOE D
BROUX JAN MICHEL MARIA
COPS VALENTIN ANTOINE
