| 摘要 |
An oil tank device mounted upon the body frame of a motorcycle provided with a head pipe and other frame members for storing engine oil therein comprises a tank rail connected to the head pipe and provided with an inner hollow portion, a down tube connected to the head pipe so as to extend downwardly and also encompass an inner hollow portion, a bridge frame connected to the tank rail and down tube and provided with an inner hollow portion, and front reinforcements connected to both bilateral sides of the tank rail. The down tube and the bridge frame partially define an inner space between the front reinforcements and the inner space formed by means of front reinforcements communicates with the respective inner hollow portions of the tank rail, the down tube and the bridge frame. The lower end portions of the tank rail and the down tube have wall thicknesses which are gradually increased in the downward direction. The frame members of the body frame are welded at the most thickened portions of the lower portions thereof.
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