Patent ID: 7694985
Filing Date: 2010-04-13
Classification: B62K

Abstract:
1. A motorcycle frame, comprising: a head pipe; a pair of main frames integrally attached to the head pipe and extending rearwardly therefrom; a down tube attached to, and extending downwardly from the head pipe under the main frames; a pair of lower pipes which extend rearwardly from the down tube; a pair of forged pivot plates; and a reinforcing body disposed at a connection portion of the head pipe and the down tube, wherein: a part of said reinforcing body forms a lower portion of said head pipe, and is configured to receive an upper part of a motorcycle steering shaft therethrough; the reinforcing body is formed by forging, and the head pipe, the main frames, and the down tube and the lower pipes are all formed integrally by a large scale casting; the main frames and the lower pipes are connected to each other by the pivot plates; and the pivot plates are disposed at, and join, rear ends of the main frames and rear ends of the lower pipes.