Tire abrasion predicting method, tire designing method, tire manufacturing method, tire abrasion predicting system, and program

A tire designing method for predicting an abrasion characteristic of a tire by calculating a tire sliding amount at a slip ratio applied to the tire rolling on a road surface so as to form a sliding region on a contact patch and for designing a tire by using a result of the predicting, the method including the steps of:

• acquiring a characteristic curve of a tire axis force exerted on a tire rotation axis at the slip ratio applied to the tire, the tire axis force being changed depending upon the slip ratio;
• deriving values of tire dynamic element parameters for determining the characteristic curve from the characteristic curve based on a tire dynamic model constituted by the tire dynamic element parameters;
• calculating a tire sliding amount based on a sliding region, the sliding region and an adhesive region, which are formed on the contact patch of the tire at the applied slip ratio, being calculated by applying the values of the tire dynamic element parameters to the tire dynamic model;
• predicting an abrasion characteristic of a tread part of the tire at the applied slip ratio by using the tire sliding amount in combination with abrasion characteristic data of a tread rubber of the tread part;
• correcting values of tire dynamic element parameters in a case where a predicted result as to the abrasion characteristic of the tread part does not reach a target;
• and
• determining the values of the tire dynamic element parameters as a tire designing specification characteristic in a case where the predicted result of the abrasion characteristic of the tread part reaches the target.

A tire manufacturing method that a tire is manufactured by using a structural part of the tire or a rubber part of the tire, which is determined by a tire designing method for predicting an abrasion characteristic of a tire by calculating a tire sliding amount at a slip ratio applied to the tire rolling on a road surface so as to form a sliding region on a contact patch and for designing a tire by using a result of the predicting, the tire designing method including the steps of:

• acquiring a characteristic curve of a tire axis force exerted on a tire rotation axis at the slip ratio applied to the tire, the tire axis force being changed depending upon the slip ratio;
• deriving values of tire dynamic element parameters for determining the characteristic curve from the characteristic curve based on a tire dynamic model constituted by the tire dynamic element parameters;
• calculating a tire sliding amount based on a sliding region, the sliding region and an adhesive region, which are formed on the contact patch of the tire at the applied slip ratio, being calculated by applying the values of the tire dynamic element parameters to the tire dynamic model;
• predicting an abrasion characteristic of a tread part of the tire at the applied slip ratio by using the tire sliding amount in combination with abrasion characteristic data of a tread rubber of the tread part;
• correcting values of tire dynamic element parameters in a case where a predicted result as to the abrasion characteristic of the tread part does not reach a target;
• and
• determining the values of the tire dynamic element parameters as a tire designing specification characteristic in a case where the predicted result of the abrasion characteristic of the tread part reaches the target.

A tire abrasion predicting system for predicting an abrasion characteristic of a tire by calculating a tire sliding amount at a slip ratio applied to the tire rolling on a road surface to form a sliding region on a contact patch, which includes:

• means for acquiring a characteristic curve of a tire axis force exerted on a tire rotation axis at the slip ratio applied to the tire, the tire axis force being changed depending upon the slip ratio;
• means for deriving values of tire dynamic element parameters for determining the characteristic curve from the characteristic curve of the tire axis force based on the tire dynamic model, the tire dynamic model constituted by the tire dynamic element parameters;
• means for calculating an adhesive region and a sliding region by applying the values of the tire dynamic element parameters to the tire dynamic model, the regions formed on the contact patch of the tire at the applied slip ratio, and for calculating a tire sliding amount from the sliding region;
• and
• means for predicting an abrasion characteristic of a tread part of the tire at the applied slip ratio by using the tire sliding amount in combination with abrasion characteristic data of a tread rubber of the tread part.

A computer readable medium having a program stored thereon for executing a computer to perform a method for predicting an abrasion characteristic of a tire by calculating a tire sliding amount at a slip ratio applied to the tire rolling on a road surface to form a sliding region on a contact patch, the method comprising:

• acquiring a characteristic curve of a tire axis force exerted on a tire rotation axis at the slip ratio applied to the tire, the tire axis force being changed depending upon the slip ratio, and causing a memory of the computer to store the acquired characteristic curve;
• deriving values of tire dynamic element parameters for determining the characteristic curve from the characteristic curve of the tire axis force stored in the memory based on the a dynamic model constituted by the tire dynamic element parameters;
• applying the derived values of the tire dynamic element parameters to the tire dynamic model to acquire both an adhesive region and a sliding region, which are formed on the contact patch of the tire at the applied slip ratio;
• calculating a tire sliding amount from the sliding region;
• and
• predicting an abrasion characteristic of a tread part of the tire at the applied slip ratio by using the tire sliding amount in combination with abrasion characteristic data of a tread rubber of the tread part.