LEAF SPRING DEVICE HAVING EYE, LEAF SPRING DEVICE MANUFACTURING METHOD, AND SHOT PEENING APPARATUS.

摘要

A leaf spring device (10) is provided with a leaf spring (11) comprising an eye (12) at each end thereof, and a bushing (20) press-fitted into the eye (12). The inner surface (30) of the eye (12) is cut with a tool such as a reamer and is shot-peened. A compressive residual stress distribution, due to shot peening, on the inner surface (30) of the eye is such that the absolute value of a compressive residual stress (Ï„1) in a first region (S1), including a winding start portion (31), of the eye (12) and the absolute value of a compressive residual stress (Ï„2) in a second region (S2), including a winding intermediate portion (32), of the eye (12) are larger than the absolute values of compressive residual stresses (Ï„3) in other regions (S3) of the inner surface (30) of the eye.