METHOD AND DEVICE FOR TYRE BEAD UNSEATING TEST

摘要

The invention concerns testing and trial methods and machines for a bead unseating test of a mounted tyre assembly, characterised in that they only transmit, on machine, the testing (or load ) forces along a so-called normal direction, that is through the part of the tyre designed to be in contact with the ground, in other words in normal conditions the tyre crown (substantially the running tread) and, in extreme testing conditions, the crown, the shoulder and ultimately the sidewall of the tyre. The force EF can include three components N (normal), T (transverse) and L (longitudinal). The test plate can be operated in static mode ( the tyre being set on the test plate) or in dynamic mode (the tyre running with a drift on the steering wheel or another testing surface). The invention enables to impose a caster, a camber, and to simulate all types of running conditions. The correlation is of the order of 80 % with track tests.