Patent ID: 8911312

Claim:
A belt-type continuously variable transmission comprising: a drive pulley assembly mounted to a drive shaft; a driven pulley assembly mounted to a driven shaft; a belt wrapped around the drive pulley assembly and the driven pulley assembly; and a case assembly for accommodating the drive pulley assembly, the driven pulley assembly, and the belt; wherein the case assembly includes: a case body having a bottom wall portion joined to a housing of a drive device, and a peripheral wall portion surrounding the drive pulley assembly, the driven pulley assembly, and the belt; and a cover joined to the case body; and wherein an air-intake duct through which air from outside is taken into the case body and an air discharge duct through which the air is discharged are attached to the case body; the cover soley supports the drive shaft among the group comprising the drive shaft, the driven pulley assembly, and the driven shaft; a plurality of drive-side ribs are provided to extend radially from a drive-side center corresponding to a center axis of a drive shaft portion on an inner surface of the cover; a plurality of driven-side ribs are provided to extend radially from a driven-side center corresponding to a center axis of the driven shaft portion on the inner surface of the cover; a total number of the driven-side ribs is greater than a total number of the drive-side ribs.