Patent ID: 7077095
Filing Date: 2006-07-18
Classification: F02F

Abstract:
1. A cylinder block having bolt holes formed on the upper surface for connecting a cylinder head with bolts, arch-shaped coupling surfaces formed on the rear end surface for mounting a housing, and a crankshaft bearing portion formed in the central part between the lower ends of said coupling surfaces, the cylinder block comprising: an arch-shaped rib joining upper parts of said coupling surfaces into an arch-shape; right and left bosses having bolt holes formed therein and having lower ends extending to lower parts of said arch-shaped rib so as to be connected thereto; right and left main radial ribs extending from the outside of the lower end ends of said bosses to the center of said crankshaft bearing portions; a top face lateral rib formed to extend in a lateral direction above said arch-shaped rib; and right and left vertical ribs connecting both right and left ends of the face lateral rib to said coupling surface and arch-shaped rib formed outside said right and left bolt hole bosses.