Swing arm support structure of motorcycle

摘要

The invention refers to a body structure of a motorcycle capable of improving an assembling performance and the like. To achieve this, a crank case 14 is divided into an upper half 30 and a lower half 31. A crank shaft 32, a main shaft 34, a counter shaft 35, and a pivot portion 36 are arranged substantially on a straight line along a parting plane P of the crank case 14. An eccentric cam 37 and a pivot collar 38 are disposed in the pivot portion 36, and a rear swing arm 16 is connected to the pivot shaft 15. The upper half 30 and lower half 31 are vertically mated to each other in front of and behind the pivot portion 36 and then vertically fastened to each other. The center of the pivot collar is offset downward from the parting plane P.