Bridgestone Corporation

Taisuke Kuroda

Koji Suzuki

Yoshikatsu Sakai

Kouji Suzuki

Yuji Kumagai

A method and system for easily predicting a remaining lifetime of a hose are provided. A hose remaining lifetime prediction method and a hose remaining lifetime prediction system, for predicting a remaining lifetime of a hosein use, include obtaining in advance, for a hose of the same type, relationship between use time of an inner tubular rubber layerat a reference temperature and a physical property value of rubber forming the inner tubular rubber layer, generating a thermal degradation model for the inner tubular rubber layer, calculating, for the hosein use, reference temperature use time being use time of the inner tubular rubber layerat the reference temperature until a time of the prediction, and predicting the remaining lifetime of the hosein use, based on comparison between the reference temperature use time and the thermal degradation model.

Hose remaining lifetime prediction method and hose remaining lifetime prediction system

Provided is a reaction force measuring device comprising: a receiving portion; a movable portionarranged in a manner spaced from the receiving portionand capable of moving toward the receiving portion, the movable portion having a sandwiching space a formed between itself and the receiving portion, into which sandwiching space a hose H can be inserted from a direction crossing a longitudinal direction of the hose; and a measuring portionconfigured to measure a reaction force of the hose H generated when the hose is pressed and applied with a load as the movable portionmoves toward the receiving portion

Reaction force measuring device, degradation diagnosing method and degradation diagnosing device

Provided is a method for predicting the remaining life of a hose and a method for diagnosing the deterioration level of a hose that can be easily performed without breaking the hose. The disclosure includes: a testing step of performing a hose bending test; and a predicting step of predicting the remaining life of a hose subject to prediction, wherein during the hose bending test, either a value of an external force required to displace a hose portion in a direction of the external force by a predetermined displacement amount, or a value of a displacement amount in a direction of the external force of the hose portion when the external force of a predetermined magnitude is exerted on the hose portion is measured, and the measured value is obtained as the test result.

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Yokohama, Japan

Taisuke Kuroda