Process and apparatus for grinding tyres
AssigneePirelli Tyre S.p.A.
InventorStefano De Gradi
Life of this patent
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Abstract
A process and an apparatus for optimising tyres after vulcanization, in order to improve the dynamic behavior of the tyre itself. The process includes first of all the stages of measuring the curve of the radial force of the tyre, calculating the first harmonic of this radial force and identifying on the tyre a point corresponding to the maximum of the first harmonic. Subsequently, material is removed from the tread over an arc subtending a principal angle positioned either side of the maximum point of the first harmonic. The removal stage is performed by removing discrete circumferential portions of the arc with differentiated depths of removal, increasing from opposite ends of this arc toward the maximum point of the first harmonic.
Claims22
A process for grinding a tyre, comprising the steps of:
- detecting a curve of a radial force of a tyre;
- calculating a first harmonic of said radial force;
- identifying on the tyre a point corresponding to a maximum of said first harmonic;
- and
- removing material from the tread of the tyre over an arc subtending a principal angle positioned either side of the maximum point of the first harmonic,
- wherein the removal step is performed by removing from the tread discrete circumferential portions of the arc with differentiated depths of removal, increasing from opposite ends of said arc toward the maximum point of the first harmonic.
An apparatus for grinding a tyre, comprising:
- devices capable of measuring radial force of a tyre, calculating a first harmonic of said radial force and identifying on the tyre a point corresponding to a maximum of a first harmonic;
- a device capable of making the tyre rotate around an axis of rotation of the tyre;
- a removal device having working surfaces capable of engaging with a tread of said tyre;
- devices capable of moving the removal device with respect to the tyre;
- and
- a device capable of controlling the movement of said removal device, so as to remove material from the tread of the tyre over an arc subtending a principal angle positioned either side of the maximum point of the first harmonic, by removing from the tread discrete circumferential portions of the arc with differentiated depths of removal increasing from opposite ends of said arc toward the maximum point of the first harmonic.
Dependencies are inferred from the claim text.