Patent ID: 8382620

Claim:
A V-belt type continuously variable transmission attached to a crankshaft of an engine via a centrifugal clutch, comprising: a drive pulley assembly provided on a drive shaft; a driven pulley assembly provided on a driven shaft; a V-belt looped over both the drive pulley assembly and the driven pulley assembly; and a transmission case assembly housing the drive pulley assembly, the driven pulley assembly, and the V-belt, wherein: one end of the drive shaft in the shaft direction is coupled to an output side clutch housing of the centrifugal clutch; the other end of the drive shaft is rotatably supported on a boss portion formed in the transmission case assembly; the transmission case assembly includes a transmission case body fixed to or integrally formed in the crankcase of the engine, and a transmission cover made of aluminum or an aluminum alloy; the transmission cover is attached to the transmission case body; the boss portion is formed in the transmission cover; a plurality of reinforcing-ribs are formed in the transmission cover so as to extend radially from a center of the boss portion; and a plurality of rear reinforcing-ribs are formed in a rear half part of the transmission cover so as to extend in a substantially up and down direction.