Device for monitoring stresses undergone by a tire
First Claim
1. A device for monitoring the extent of damage to a reinforcing structure of a rolling tire on a vehicle, said tire containing an inner wall and an outer wall, the inflation pressure of the tire being exerted on the inner wall and said monitored structure being at least locally subjected to at least one cyclically variable mechanical stress, said device for monitoring damage to said structure comprising a flexible thin support, one face of which is designed to be fixed to one of the walls of the tire and in proximity to the structure being monitored, and means on the support, said means being sensitive to intense fatigue bending between a radius of curvature of minimum value and a radius of curvature of maximum value for a predetermined number of cycles and capable of permanently memorizing and indicating information relating to the extent of damage of the monitored structure that has undergone intense bending for at least a given number of cycles, which permanently memorized information can be checked visually by an operator or even automatically, with or without dismounting of the tire.
1 Assignment
0 Petitions
Accused Products
Abstract
A tire which, during use is subjected to one or more severe stresses lead to an appreciable reduction of its potential lifetime of use under nominal conditions. In order to be able to determine whether a tire has undergone such severe conditions, the tire is provided with a monitoring device, containing at least one means sensitive to a given stress and capable of memorizing a piece of information, according to the stress to which the component has been subjected for at least a given time or a given number of cycles.
25 Citations
13 Claims
- 1. A device for monitoring the extent of damage to a reinforcing structure of a rolling tire on a vehicle, said tire containing an inner wall and an outer wall, the inflation pressure of the tire being exerted on the inner wall and said monitored structure being at least locally subjected to at least one cyclically variable mechanical stress, said device for monitoring damage to said structure comprising a flexible thin support, one face of which is designed to be fixed to one of the walls of the tire and in proximity to the structure being monitored, and means on the support, said means being sensitive to intense fatigue bending between a radius of curvature of minimum value and a radius of curvature of maximum value for a predetermined number of cycles and capable of permanently memorizing and indicating information relating to the extent of damage of the monitored structure that has undergone intense bending for at least a given number of cycles, which permanently memorized information can be checked visually by an operator or even automatically, with or without dismounting of the tire.
- 6. A tire intended to be mounted on a vehicle characterized in that it is provided, on all or part of at least one of its walls, with at least one device for monitoring the extent of damage to at least one component of said tire, resulting from a predetermined stress that can occur during the rolling of said tire, said device being equipped with at least one means sensitive to fatigue bending between a radius of curvature of minimum value and a radius of curvature of maximum value for a predetermined number of cycles and capable of permanently memorizing and indicating information characteristic of the extent of said stress after a given number of cycles or after a given minimum time.
- 9. A tire having two beads intended to come in contact with a mounting rim, a crown provided with crown reinforcement and two side walls, each extending between one lateral end of the crown reinforcement and one bead, each side wall containing at least one carcass reinforcing structure with a plurality of reinforcements arranged in a direction forming an angle at least equal to 45 degrees with the circumferential direction and each side wall having an outer wall and an inner wall on the tire, the inflation pressure of said tire being exerted on the inner wall, and said tire being characterized in that it is equipped on one of the walls of the tire with at least one device monitoring damage to the carcass reinforcing structure, said device comprising at least one means sensitive to fatigue bending between a radius of curvature of minimum value and a radius of curvature of maximum value for a predetermined number of cycles and capable of permanently memorizing and displaying information characteristic of a predetermined amount of stress sustained by said structure for at least a predetermined rolling time.
- 12. A monitoring device for providing an indication of the extent of damage to which a region of a tire has been subjected by repeated stress, said monitoring device comprising a bendable support intended to be applied to a wall of the tire at said region and bendable means mounted on the support to provide an indication of the extent of the damage, the material of said bendable, indicating means being designed to break after repeated, extensive bendings so that its breakage provides the indication of the extent of the damage to the region of the tire.
Specification