Patent ID: 7730800
Filing Date: 2010-06-08
Classification: F02B,F16H,Y10T

Abstract:
1. A power unit, comprising: an engine having a crankcase rotatably supporting a crankshaft; and a transmission for changing a speed of power of the crankshaft, the transmission including: wherein the gearshift shaft includes an extending shaft portion extending in a first axial direction from the crankcase accommodating a crank portion of the crankshaft; wherein the first and second gearshift clutches are supported by the extending shaft portion; wherein the extending shaft portion is supported by a bearing portion on a side opposite to the crankcase across the first and second gearshift clutches; and a front connection portion is operatively connected to said first gearshift clutch and a second connection portion is operatively connected to said second gearshift clutch and a centrifugal clutch mounted on the crankshaft for transmitting power to said first and second gearshift clutches.