Patent ID: 9254872
Filing Date: 2016-02-09
CPC Classification: B62D

Claim Text:
1. A front vehicle-body structure of a vehicle, comprising a pair of right-and-left front side frames extending substantially in a vehicle longitudinal direction at a front portion the vehicle; and a sub frame provided below the front side frames and supporting a pair of right-and-left suspension lower arms which constitute part of a vehicle suspension, wherein said sub frame comprises a sub-frame body portion extending substantially in a vehicle width direction, a pair of right-and-left extension portions extending forward from the sub-frame body portion below the side frames, and a pair of right-and-left fastening portions projecting outward, in the vehicle width direction, from a rear end of the sub-frame body portion, each of said extension portions of the sub frame comprises a front portion extending substantially in the vehicle longitudinal direction, a bending portion bending slightly inward at a rear end of the front portion, and a rear portion provided rearward from the bending portion so as to extend obliquely inward relative to the vehicle longitudinal direction, said sub frame is configured to be fastened to a vehicle body at least via said fastening portions by means of a fastening member including bolt and nut, each of the fastening portions having a bolt hole into which the bolt of the fastening member is inserted, each of said suspension lower arms is arranged in back of said front portion, on an outward side of said rear portion of the extension portion of the sub frame, and in front of said fastening portion of the sub frame, a front end of said suspension lower arm is supported at the extension portion of the sub frame by means of a supporting member, and a rear end of said suspension lower arm is supported at the fastening portion of the sub frame by means of another supporting member, and said bolt and nut of the fastening member for fastening the fastening portions of the sub frame to the vehicle body are commonly used as part of said another supporting member for supporting the rear end of the suspension lower arm such that the rear end of the suspension lower arm is co-fastened to the vehicle body together with the fastening portions of the sub frame by means of said bolt and nut, and said bolt hole of the fastening portion is located on an outward side, in the vehicle width direction, relative to a side end face of the sub-frame body portion, whereby a collision load occurring in a vehicle head-on collision is transmitted to the fastening portion from the extension portion by way of the sub-frame body portion and part of said collision load is transmitted to the fastening portion from the extension portion by way of the suspension lower arm, bypassing the sub-frame body portion.