US 5,398,545 AGranted

Dynamic-setting process and device, for checking the dynamic behavior of tires

AssigneePirelli Coordinamento Pneumatici S.p.A.

InventorsOscar Blazic, Enea Ronzoni

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Abstract

The dynamic setting of an apparatus (1) designed to check the behavior of tires comprises a rotating drum (9) arranged to act in thrust relation on a rotatable tire. A dynamometer cell (10) is connected to an electronic processing unit (12) for detecting the dynamic forces transmitted from the tire (5) to the drum (9). The setting is carried out by applying a predetermined static load to the drum (9) and afterwards transmitting cyclic dynamic forces having a predetermined frequency, intensity and dynamic variation to said drum. The cyclic forces are produced by an eccentric (20) transmitting a reciprocating motion to a movement block (22) connected to the dynamometer cells (10) by springs (29, 31). Signals emitted by the dynamometer cells (10) are detected and stored by the processing unit (12) in order to obtain data to be compared with signals emerging during the test of a tire (5).

Claims15

Dependent claims

A dynamic-setting process, for an apparatus designed to check the dynamic behavior of tires, said apparatus comprising a rotatable drum mounted on a base with a dynamometric detection means interposed between said drum and said base, said drum being arranged to act in radial thrust relation with predetermined static preloading forces against a tire which is rotatably driven about an axis parallel to an axis of the drum, said dynamometric detection means being connected to an electronic processing unit for detecting dynamic forces transmitted to the drum in addition to said static preloading forces, said process comprising the following steps:

a) starting the operating cycle of the apparatus in the absence of a tire to be tested;
b) applying a predetermined radial static-preloading forces to the drum;
c) transmitting to the drum dynamic forces having predetermined frequency;
d) processing signals transmitted by the dynamometric detection means following the application of said dynamic forces, and allocating frequency and intensity variable values to said signals, said values corresponding to the dynamic forces transmitted during step c);
e) storing data obtained from said signal processing in the processing unit;
f) repeating steps c), d) and e) several times in succession, each time transmitting predetermined dynamic forces having different frequency and intensity features in order to obtain stored data to be compared with the measurements detected during the test of a tire in order to check the dynamic behavior of said tire.

3 more elements

A dynamic-setting device, for an apparatus designed to check the dynamic behavior of tires, said apparatus comprising:

a rotatable drum mounted on a support base with a dynamometric detection means interposed between said drum and said base, said drum being arranged to act in radial thrust relation with a given static preloading forces against a tire which is rotatably driven about an axis parallel to an axis of said drum, said dynamometric detection means being connected to an electronic processing unit for detecting dynamic forces transmitted to the drum in addition to said static preloading forces, said device including at least one dynamic-stress unit having:
(a) a bearing framework fixedly engaged to the base;
(b) a first spring means and a second spring means acting between said bearing framework and said dynamometric detection means, and
(c) driving means for said first and second spring means for transmitting static preloading forces and dynamic forces of predetermined intensity variation to said dynamometric detection means.

1 more element

Dependencies are inferred from the claim text.