Automobile chassis frame structure

摘要

A first and second pipe materials forming a front side frame are arranged in an up-and-down direction in a first horizontal portion, in a left-and-right direction in a second horizontal portion, and replaced from the up-and-down direction to the left-and-right direction in an inclined portion between the first horizontal portion and the second horizontal portion, and at least in the first horizontal portion and the second horizontal portion, the first and second pipe materials are welded to each other by welds, and therefore, it becomes possible to change in the longitudinal direction the cross-sectional shape or bending stiffness of the front side frame formed by joining the first and second pipe materials without changing the cross-sectional shapes thereof in the longitudinal direction, thus providing the front side frame that has a light weight but has excellent impact absorption performance at the time of a collision.

主权项

1. A vehicle comprising:
a vehicle body frame, a power unit supported on the vehicle body frame, a floor panel supported on the vehicle body frame, a wheel operatively attached to the vehicle body frame and having a tire mounted thereon, and a passenger seat disposed above the floor panel, and an automobile chassis frame structure comprising a plurality of pipe materials arranged and joined to each other to form a frame member which is a component of said vehicle body frame, wherein in a first portion, on a first end of the frame member situated between the tire and the power unit and configured for supporting one side of the power unit, the plurality of pipe materials extend in a substantially longitudinal direction of the frame structure and are arranged in a first, substantially vertically stacked direction relative to one another, in a second portion, on a second end of the frame member situated below a lower face of the floor panel and below the passenger seat, the plurality of pipe materials extend in the substantially longitudinal direction of the frame structure and are arranged in a second, substantially horizontal side-by-side direction relative to one another, and in a third, intermediate portion sandwiched by the first and second portions of the frame member the arrangement of the plurality of pipe materials relative to one another is changed from the first direction to the second direction, wherein the plurality of pipe materials are joined to each other in the first and second portions, and are not joined to each other in the third portion, and wherein the plurality of pipe materials comprise in one portion in a longitudinal direction a changed strength portion that has a strength different from other portions.