Vibration-absorption structure of motorcycle engine crankcase and crank shaft

The utility model discloses a vibration-absorption structure of a motorcycle engine crankcase and a crank shaft. The vibration-absorption structure comprises a left crankcase body (1) and the crankshaft arranged in the left crankcase body (1) and a right crankcase body (8), wherein the crankshaft is connected with the left crankcase body (1) and the right crankcase body (8) through a left bearing (3) and a right bearing (4) respectively, and the left bearing (3) and the right bearing (4) are arranged on the crankshaft (2). Rubber buffering pads (5) are symmetrically arranged between the end face of a crankshaft hole of the left crankcase body (1) and the end face of the left bearing (3). The vibration-absorption structure has the advantages of being simple in structure, convenient to install and low in cost; axial impact of the crankshaft can be reduced, resonance frequency distribution and the resonant peak value of the crankshaft can be decomposed, vibration propagation paths are blocked, moving imbalance c