To provide a combination device of a toothed belt and a pulley which is prepared by compressively engaging a belt tooth part with a belt groove part, reduced in abnormal noises while keeping durability by specifying a compressive ratio of the belt tooth, and by specifying a backlash rate between the belt tooth and the pulley toot groove.
A belt tooth part 5 and a pulley groove part 12 each have a shape composed of two circular arcs, and tangential lines connecting them to each other. The belt tooth part 5 has a compression ratio of 2 to 4% when it is compressively engaged with the pulley groove part 12. The rate of backlash between the belt tooth part 5 and the pulley groove part 12 ranges between 11% and 14% of tooth width W of the belt tooth part 5.
DEGUCHI ISAO
YAMASHITA KIICHIRO
