抄録
In order to investigate the cause and existing conditions of the failure in the automobile leaf springs, we have performed the test on the front leaf spring of the Toyopet trucks. We found that there are two kinds of failure, the one being impact failure and the other fatigue failure.
Spring leaves that have been heat treated to comparably high hardness are often failed by impact, and fatigue failure is properly related with the hardness, surface conditions and quality of steel.
Means to improve the quality of automobile leaf springs were, therefore, concluded as follows:
(1) Improving the quality of spring steel,
(2) Improving surface conditions of spring leaves,
(3) Improving uniformity of hardness in each spring leaf,
(4) Minimizing marks of hammering on the surface resulting from correcting the shape of leaves with hammer,
(5) Rationalizing amounts of nip.
