Abstract: A structure for attaching an electrically-operated power steering apparatus for a vehicle. The structure includes a body frame, more specifically, sub slant frames having respective motor brackets for supporting an actuator unit. The motor brackets have bolts that fasten the actuator unit, and the bolts extend perpendicularly to a steering shaft. With this configuration, the structure is not affected by a manufacturing error of a body frame and other parts of the vehicle. Further, the structure takes account of a direction in which fastening means is tightened.

Abstract: To constrain a load applied to a steering shaft and a power assist unit. In a rough terrain vehicle including a power assist unit including an electrically-driven power steering apparatus provided coaxially with a steering shaft, and an electrically-driven motor provided in the power assist unit arranged so as to be orthogonal to the steering shaft, a rear end portion of the electrically-driven motor is supported by a motor supporting member which is mounted to inclined frames of a vehicle body frame.

Abstract: To effectively cool an electric power steering system having an electric motor. A rough terrain vehicle includes an electric motor that is disposed substantially orthogonal to a steering shaft with an engine and an exhaust pipe that are disposed behind the steering shaft and under a seat. A forced air cooling fan is provided for cooling the electric motor. The forced air cooling fan is provided behind the electric motor and in front of the engine or exhaust pipe.

Abstract: A crankcase for a motorcycle is divided into an upper half and a lower half. A crankshaft, a main shaft, a counter shaft, and a pivot portion are arranged substantially on a straight line along a parting plane P of the crankcase. An eccentric cam and a pivot collar are disposed in the pivot portion, and a rear swing arm is connected to the pivot shaft. The upper half and lower half are vertically mated to each other in front of and behind the pivot portion and then vertically fastened to each other. The center of the pivot collar is offset downwardly from the parting plane P.