Front Sub-Frame Truss Structure for Rhombus Deformation Control

The patent transitions from a single vertical brace to a three-dimensional truss structure composed of multiple diagonal members arranged in a triangular configuration. This spatial arrangement in multiple dimensions provides enhanced stiffness and resistance to deformation without requiring individual members to be thick in the vertical direction, thus avoiding engine interference while maintaining structural integrity.

The reinforcement structure is divided into multiple discrete diagonal members (first and second diagonal members, third and fourth diagonal members) that form a truss assembly. Each member can be made thin to avoid engine interference, but their collective arrangement in a triangular truss configuration provides the necessary overall stiffness and prevents rhombus-shaped deformation of the rear portion.

Instead of using a single thick vertical brace that would occupy vertical space and interfere with engine mounting, the patent employs a truss structure with diagonal members arranged in a three-dimensional configuration. This distributes the reinforcement function across multiple dimensions and orientations, providing high resistance to deformation while maintaining clear vertical clearance for engine installation.

The reinforcement function is segmented into multiple thin diagonal members rather than one thick member. Each member is positioned at specific angles and locations to optimize structural performance while minimizing interference with the engine compartment volume, allowing adequate space for engine mounting and maintenance access.

The rear portion reinforcement is segmented into multiple diagonal members (first diagonal member coupling left arm supporting part to right side member, second diagonal member coupling right arm supporting part to left side member, third and fourth diagonal members providing additional triangulation) arranged in a truss configuration. This segmentation creates multiple triangular units that collectively prevent rhombus-shaped deformation while maintaining a relatively simple overall structure that can be manufactured and assembled efficiently.

The patent introduces diagonal members that extend in oblique directions rather than purely vertical or horizontal orientations. This three-dimensional arrangement of members creates triangular truss units that provide superior resistance to shear and bending loads, preventing the trapezoidal shape from deforming into a rhombus under operational loads while keeping the structural design straightforward.