Method for improving the performance of studded tires and studded tires obtained according to the method
A technology of anti-skid studs and tires, which is applied in the direction of tire tread/tread pattern, tire parts, transportation and packaging, etc. It can solve the problems of reducing the retention of anti-skid studs on the tread belt and detachment of anti-skid studs
Active Publication Date: 2017-06-20
PIRELLI TYRE SPA
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Problems solved by technology
In particular, the applicant has noted the possibility of the studs becoming detached from the tread band in studded tires mounted on relatively heavy and powerful vehicles capable of imparting high acceleration to the vehicle bigger
[0022] The applicant has thus also observed that the tangential stress exerted on the pin of the stud causes the stud to vibrate in the hole, which in the worst case may lead to a direct pull-out of the stud or (considering the stud (very hard) difference in hardness between the stud body) and the tread band (very deformable) relative movement of the stud body with respect to the wall portion delimiting the hole housing the stud, which will cause friction between the stud and the tread band
[0023] Furthermore, the Applicant has observed that this friction is more pronounced at the base of the stud, since this is the furthest longitudinal distance from where the tangential stress on the pin is applied, reducing the stud's grip on the tread. Retention in the belt and thus promotes the undesired result whereby the stud comes out
Method used
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[0086] Referring to the accompanying drawings, 1 generally indicates a studded tire manufactured according to the method of the present invention.
[0087] According to a structure known per se in the technical field in question, the tire 1 generally comprises a tread band 2 formed annularly around the axis of rotation X of the tire 1 and arranged radially on the belt structure of the tire 1 . to the external position.
[0088] In turn, the belt structure is coupled in the carcass structure at a radially external position, both structures known per se and not shown in the drawings.
[0089] The tread band 2 is made of elastomeric material and defines a radially outer tread surface 3 for contact between the tire 1 and the road surface during a rolling movement about the axis X of the radially outer tread surface 3 .
[0090] The tire 1 is preferably directional and thus determines its preferred direction of rolling, given by figure 1 Shown in F. In this way, for each point o...
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The invention relates to a method for improving the performance of a studded tire having a tread band (2) in which a plurality of holes (4) are formed, corresponding to a plurality of holes (4). A cleat (10) is received in said hole by engagement, each said cleat including a base (13) received at a radially inner position within the hole. The method includes inhibiting substantially parallel winding of the cleat (10) in the hole (4) by providing mutually opposite front abutment areas (16a) and rear abutment areas (17a) on the base (13). oscillations of an axis relative to the tire's axis of rotation (X), thereby providing a mutual abutment between said base (13) and said tread band (2), wherein said front abutment area (16a) is larger than said The base (13) is arranged asymmetrically with respect to the radial plane (R) of the tire passing through the longitudinal axis (Z) of the stud in such a manner as to raise the tread band The holding effect on said cleat. The invention also relates to tires having such studs.
Description
technical field [0001] The present invention relates to a method of improving the performance of a studded tyre, in particular to increase its durability over time to ensure a more effective retention of the studs in the tread band of the tyre. [0002] Furthermore, the invention relates to a studded tire produced according to this method and to a tire stud specially configured for use with this tire. Background technique [0003] Tires generally comprise a carcass structure annularly formed about an axis of rotation and comprising at least one carcass ply having end strips engaged in respective annular anchoring structures. [0004] At a position radially outwardly of the carcass structure, there is provided a belt structure comprising one or more belt layers arranged to overlap radially with respect to each other and with respect to the carcass ply, and The belt layer has textile or metal reinforcing cords oriented crosswise and / or substantially parallel to the direction ...
Claims
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IPC IPC(8): B60C11/16
CPCB60C11/1656B60C11/1675B60C11/1643B60C11/16
Inventor A·特龙冰J·伦德策
Owner PIRELLI TYRE SPA