Patent ID: 7503575

Claim:
A body frame of a two-wheeled vehicle comprising: a head pipe to which a steering shaft extending substantially vertically is rotatably mounted, the head pipe supporting a front portion of a main frame extending substantially forward and rearward of a vehicle body of the two-wheeled vehicle and supporting an upper portion of a down tube extending substantially vertically, the head pipe including: an upper head pipe disposed on an upper side in an axial direction of the steering shaft, the upper head pipe having a taper portion at an outer peripheral region of a lower end portion thereof; and a lower head pipe disposed on a lower side in the axial direction of the steering shaft, the lower head pipe having a taper portion at an outer peripheral region of an upper end portion thereof, the taper portion of the upper head pipe and the taper portion of the lower head pipe forming a groove extending in a circumferential direction of the head pipe with the upper head pipe and the lower head pipe in contact with each other, and the upper head pipe and the lower head pipe being molded and coupled to each other and welded to each other along the groove; wherein the upper head pipe includes an upper tubular portion into which the steering shaft is inserted and a main frame tongue portion that extends rearward from the upper tubular portion along an outer wall surface of the front portion of the main frame and supports a front portion of the main frame from above; and wherein the lower head pipe includes a lower tubular portion into which the steering shaft is inserted and a down tube tongue portion that extends downward from the lower tubular portion along an outer wall surface of the upper portion of the down tube and supports an upper portion of the down tube from forward.