Frame structure for saddle-ridden-type vehicle

摘要

There is provided a frame structure for a saddle-ridden type vehicle. A pair of tank rails are jointed to a head frame and extend rearward of a vehicle body from the head frame. The head frame includes a head pipe portion and a pair of arm portions being continuous with the head pipe portion and extending rearward of the vehicle body. Each of upper surfaces of at least one of rear end portions of the arm portions and front end portions of the tank rails are formed into a convex surface having an arc-shaped cross section. The rear end portions of the arm portions and the front end portions of the tank rails are respectively welded to each other so that end portions of weld beads are positioned at side surfaces thereof.

主权项

1. A frame structure for a saddle-ridden type vehicle, the frame structure comprising:
a head frame positioned at a front portion of a vehicle body; and a pair of right and left tank rails jointed to the head frame, the pair of right and left tank rails extending rearward of the vehicle body from the head frame, wherein the head frame includes a head pipe portion supporting a front-wheel suspension portion, and a pair of right and left arm portions being continuous with the head pipe portion and extending rearward of the vehicle body, wherein each of upper surfaces of at least one of rear end portions of the pair of right and left arm portions and front end portions of the pair of right and left tank rails are formed into a convex surface having an arc-shaped cross section, and wherein the rear end portions of the pair of right and left arm portions and the front end portions of the pair of right and left tank rails are respectively welded to each other so that end portions of weld beads are positioned at side surfaces thereof.