| 摘要 |
A vehicle body side frame is a member that absorbs applied impact load by bending under the impact load. The vehicle body side frame includes plural ultrahigh strength portions provided at intervals along a longitudinal direction, and plural high strength portions interposed between the plural ultrahigh strength portions. A tensile strength of the ultrahigh strength portions exceeds 1400 MPa, and a tensile strength of the high strength portions is from 500 MPa to 1000 MPa. The high strength portions are formed with a sheet thickness greater than that of the ultrahigh strength portions. A front stress concentrating portion, a central stress concentrating portion, and a rear stress concentrating portion are respectively formed to a front high strength portion, a central high strength portion, and a rear high strength portion. |
| 主权项 |
1. A vehicle body side frame that is formed in a hollow shape extending along a vehicle body front-rear direction and that absorbs applied impact load by bending under the applied impact load, the vehicle body side frame comprising:
a plurality of ultrahigh strength portions provided at intervals along a longitudinal direction of the vehicle body side frame, each of the plurality of ultrahigh strength portions having a hollow shape and having a tensile strength exceeding 1400 MPa; and a high strength portion interposed between adjacent ultrahigh strength portions so as to connect the adjacent ultrahigh strength portions to each other, the high strength portion having a hollow shape and having a tensile strength from 500 to 1000 MPa, wherein the high strength portion has a sheet thickness greater than that of the ultrahigh strength portions, and includes a stress concentrating portion on a side portion thereof in a direction the vehicle body side frame will bend. |
