Patent ID: 7559308
Filing Date: 2009-07-14
Classification: F01N,F02B,Y02A

Abstract:
1. A motorcycle equipped with an engine comprising: a crank chamber in which a crankshaft with a drive gear is disposed; a transmission chamber in which a transmission unit of the vehicle is disposed, the transmission unit having an input shaft with a driven gear and a drive gear that is coupled to the crankshaft via the drive gear of the crankshaft and the driven gear of the input shaft, and that is configured to receive a rotation transmitted from the crankshaft, to be driven by the crankshaft, and having an output shaft with a driven gear that is coupled to the input shaft via the drive gear of the input shaft and the driven gear of the output shaft and is configured to receive a rotation transmitted from the input shaft, the input shaft being positioned substantially immediately below the crank shaft, and the output shaft being disposed farther than the input shaft from the cylinder; a cylinder extending forward from the crank chamber in the motorcycle; a cylinder head attached to the cylinder; and a main frame of the motorcycle configured to extend above the engine along the longitudinal direction of the motorcycle; wherein the crank chamber is located above the transmission chamber, and the cylinder is disposed in such a manner that an axial direction thereof is oriented in a range substantially from a horizontal direction to a direction in which the main frame extends, such that the cylinder is disposed in an orientation between horizontal and inclined with a cylinder head side higher and the axial direction of the cylinder oriented in the direction in which the main frame extends.