Patent ID: 7677346
Filing Date: 2010-03-16
Classification: B62K

Abstract:
1. A frame structure of a motorcycle comprising: a head pipe disposed in a front side of a vehicle frame; left and right main pipes extending from the head pipe toward a rear side of the vehicle frame and welded to the head pipe; and a down tube extending from the head pipe toward the rear side and welded to the head pipe; wherein the head pipe includes: wherein the head pipe main body, the main pipe connection portion and the down tube connection portion are integrally formed with one another by a casting or a forging; wherein the down tube connection portion includes: wherein the extension connection portion includes: wherein a dimension of the down tube supporting portion in a vehicle width direction is substantially the same as that of the head pipe; and wherein the solid portion is formed with concave portions so that a dimension of the solid portion in the vehicle width direction is smaller than that of the down tube supporting portion.