| 摘要 |
A front portion of a vehicle body frame is provided with a structure wherein the number of locations to be welded can be reduced and is superior in the absorption of an impact. A vehicle body frame main part having a substantially T-shape as viewed in side elevation is formed from a pair of left and right main frames, center frames and rear frames, and supports an engine and rear wheel suspension mechanisms thereon. A vehicle body frame front portion supports a front wheel suspension mechanisms and includes a lower steering stay extending obliquely downwardly and rearwardly as viewed in a side elevation from front end portions of the main frames, and down pipes and front side members of a lower frame which make a substantially triangle whose oblique line is provided by the lower steering stay. The lower steering stay in its entirety including a cross portion to which the main frames are welded and a pair of left and right arm portions extending rearwardly from rear end portions of the cross portion is formed as a unitary member by casting, and rear end portions of the arm portions are fastened to the front side members of the lower frame by means of bolts. Rear side members of the lower frame are removably mounted between the front side members and lower end portions of the center frames so that the engine can be removed downwardly if the rear side member is removed.
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