POWER UNIT AND MOTORCYCLE WITH THE SAME

摘要

A power unit having a stepped automatic transmission in which shift clutches are arranged on an input shaft connected to a crankshaft. The power unit has a simple structure and is compact in size in the direction of the axis of the crankshaft. An engine unit (20) is mounted such that, in a region behind the crankshaft (34) and inward, with respect to the vehicle's lateral direction, of a transmission device (31), at least a part of a rear wheel (18) is located outward, with respect to the vehicle's lateral direction, of a crank pin (34c). On the input shaft (52) are mounted first and second clutches (55, 59) and a first and second shift gear pair (86, 83). A third kick gear (111) directly or indirectly meshes with that part of the crankshaft (34) which is inward, with respect to the vehicle's lateral direction, of a first shift gear (58). At least a part of a second shift gear (63) is located outward, with respect to the vehicle's lateral direction, of an inner wall (11d).