Patent ID: 8672076

Claim:
A frame structure for a motorcycle comprising a construction frame to mount and support an engine, a suspension unit, a transmission device, one front wheel and two rear wheels, wherein said frame structure comprises: a supporting frame adapted for longitudinally extending along a central axis of said construction frame and for connecting with said construction frame at a position that said suspension unit provided between said supporting frame and said construction frame for absorbing shock; an axle supporter transversely provided at a rear end of said supporting frame, wherein a transmission cavity is defined at said rear end of said supporting frame and at a central position thereof behind an output of said engine along said central axis of said construction frame; and a rear axle rotatably and transversely supported by said axle supporter for connecting with said two rear wheels at two outer ends thereof, wherein a transmission cavity is arranged for supporting said transmission device therein to transmit a rotation output from said engine to drive said rear axle to rotate so as to driving said rear wheels to rotate.