Abstract: A suspension frame structure with which a high rigidity can be obtained with respect to load applied from suspension arms and an engine mount is provided. In a suspension frame structure according to the present invention, a suspension frame includes a right front fixing portion, a left front fixing portion, a right rear fixing portion and a left rear fixing portion to which a right suspension arm and a left suspension arm are fixed, contours of the right extension bracket and the left extension bracket on an interior side of a vehicle extend along an circular arc-shaped locus that connects side member fixing positions and an engine mount attachment portion, as viewed from an upper side of a vehicle, and tangents at front ends of the contours respectively pass through arm fixing positions.

Abstract: A suspension frame structure comprises a suspension frame and a reinforcement. The reinforcement has a support portion that extends in the up-down direction within the suspension frame and connects an upper wall and a lower wall of the suspension frame to each other, a front upright wall that extends outward in the vehicle-width direction and further to the front side of a vehicle from a side face of the support portion and is joined to at least one of the upper wall and the lower wall of the suspension frame, and a rear upright wall that extends outward in the vehicle-width direction and further to the rear side of the vehicle from the side face of the support portion and is joined to at least one of the upper wall and the lower wall of the suspension frame. The front upright wall and the rear upright wall form an L-shape.

Abstract: A suspension frame structure comprises a suspension frame and a reinforcement. The reinforcement has a support portion that extends in the up-down direction within the suspension frame and connects an upper wall and a lower wall of the suspension frame to each other, a front upright wall that extends outward in the vehicle-width direction and further to the front side of a vehicle from a side face of the support portion and is joined to at least one of the upper wall and the lower wall of the suspension frame, and a rear upright wall that extends outward in the vehicle-width direction and further to the rear side of the vehicle from the side face of the support portion and is joined to at least one of the upper wall and the lower wall of the suspension frame. The front upright wall and the rear upright wall form an L-shape.

Abstract: A suspension frame structure with which a high rigidity can be obtained with respect to load applied from suspension arms and an engine mount is provided. In a suspension frame structure according to the present invention, a suspension frame includes a right front fixing portion, a left front fixing portion, a right rear fixing portion and a left rear fixing portion to which a right suspension arm and a left suspension arm are fixed, contours of the right extension bracket and the left extension bracket on an interior side of a vehicle extend along an circular arc-shaped locus that connects side member fixing positions and an engine mount attachment portion, as viewed from an upper side of a vehicle, and tangents at front ends of the contours respectively pass through arm fixing positions.