The invention belongs to the technical field of passenger car parts, and particularly relates to an auxiliary frame obtained through
welding hollow cast aluminum and aluminum profiles. The auxiliary frame comprises a left hollow cast body, a right hollow cast body, a front cross beam, a middle cross beam, a rear cross beam, a left front
control arm installation support, a left front car body installation hole supporting column, a left rear
control arm installation support, a left middle car body installation hole supporting column, a left rear car body installation hole supporting column, a right front
control arm installation support, a right front car body installation hole supporting column, a right rear control arm installation support, a right middle car body installation hole supporting column, a right rear car body installation hole supporting column, a front suspension installation support of a power
assembly, a left rear suspension installation support of the power
assembly and a right rear suspension installation support of the power
assembly. The problem that the inblock cast of the large-scale aluminum auxiliary frame is difficult is solved, the arrangement, function and
crashworthiness requirements of Macpherson
double wishbone suspension on the auxiliary frame are met, and the advantages of high strength, high rigidity, light weight and the like are achieved.