Honda Motor Co., Ltd.

E. Tech Incorporation

Fumio Kikuchi

Mitsuru Inoue

Yutaka Hozumi

Jun Matsuike

A vehicular suspension arm is provided in which an arm main body () includes a main plate () press-formed as a main part of the arm main body and having a short cylindrical part (EB) provided integrally with one end by flanging, and a reinforcing plate (H) superimposed on one of upper and lower faces of the main plate () and reinforcing the main plate (). The reinforcing plate (H) has an eye-shaped head part (Ha) formed in an annular shape and arranged coaxially with the short cylindrical part (EB), and a tail part (Hb) extending integrally from the eye-shaped head part (Ha) along the longitudinal direction of the main plate (), is formed from a single plate material that is thicker than the main plate (), and has at least the tail part (Hb) welded to the main plate (). A bush press-fit portion (P) is formed from an inner peripheral face of the eye-shaped head part (Ha) and an inner peripheral face of the short cylindrical part (EB). This ensures that the cross-sectional shape of a transition section from the bush press-fit portion to the plate-type arm main body is adequate, thus enabling the rigidity and strength required for the transition section to be easily guaranteed and, furthermore, it becomes possible to meet a requirement for increasing the strength of the arm without specially increasing the space around the outer periphery of the bush press-fit portion.

Vehicular suspension arm

In a torsion beam suspension including: a pair of left and right trailing arms; a torsion beamproviding connection between the trailing arms; and gussetswhich are U-shaped in section and substantially triangular in plane view and which are welded to inner side surfaces of connecting portions between the trailing armsand the torsion beam, seat surfacesare formed by crushing at left and right opposite end portions of a rear wallof the torsion beam, the seat surfacesbeing offset forward from a general outer surface of the rear wallby an amount e larger than a plate thickness t of the gussets, and each gussetincludes an inner end edge portionsuperposed on an intermediate portion in a lateral direction of the seat surface, and upper and lower front edge portionsconnected by a weld Wto upper and lower portions of an outer surface of the torsion beam. Thus, in the torsion beam, an abrupt increase in torsional rigidity is suppressed in the gusset inner end portion without reducing strength of the torsion beam to alleviate stress concentration, thereby providing a torsion beam suspension having a high durability.

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Tochigi, Japan

Fumio Kikuchi