LEAF-SPRING LIFE PREDICTION DEVICE FOR VEHICLE

To predict the life of a leaf spring.SOLUTION: A leaf-spring life prediction device 10 includes: a strain distortion 11 that detects distortion of an axle beam; and a controller 15. The distortion gauge 11 sequentially detects distortions of the axle beam caused by loads input to the axle beam. Base...

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Bibliographic Details
Main Author IWASE NOBUO
Format Patent
LanguageEnglish
Japanese
Published 16.03.2022
Subjects
BLASTING
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
MEANS FOR DAMPING VIBRATION
MEASURING
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
PHYSICS
SHOCK-ABSORBERS
SPRINGS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
THERMAL INSULATION IN GENERAL
TRANSPORTING
VEHICLE SUSPENSION ARRANGEMENTS
VEHICLES IN GENERAL
WEAPONS
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Summary:To predict the life of a leaf spring.SOLUTION: A leaf-spring life prediction device 10 includes: a strain distortion 11 that detects distortion of an axle beam; and a controller 15. The distortion gauge 11 sequentially detects distortions of the axle beam caused by loads input to the axle beam. Based on distortion information of the axle beam, a load estimation unit 19 of a CPU 17 of the controller 15 estimates a load to be input to a leaf spring. From the load to be input to the leaf spring, a life determination unit 20 of the CPU 17 estimates stress of the leaf spring that may change with time and obtains a degree of cumulative fatigue damage of the leaf spring from "fatigue life information" of a storage unit 18. Then, the life determination unit 20 compares the degree of cumulative fatigue damage of the leaf spring with a predetermined threshold value and, when the degree of cumulative fatigue damage reaches the predetermined threshold value, determines a warning state in which the remaining life of the leaf spring is a short.SELECTED DRAWING: Figure 3 【課題】リーフスプリングの寿命を予測する。【解決手段】リーフスプリング寿命予測装置１０は、アクスルビームの歪みを検出する歪みゲージ１１とコントローラ１５とを備える。歪みゲージ１１は、アクスルビームに入力する荷重によるアクスルビームの歪みを逐次検出する。コントローラ１５のＣＰＵ１７の荷重推定部１９は、アクスルビームの歪み情報に基づいてリーフスプリングに入力する荷重を推定する。ＣＰＵ１７の寿命判定部２０は、リーフスプリングに入力する荷重から経時的に変化するリーフスプリングの応力を推定し、記憶部１８の「疲労寿命情報」からリーフスプリングの累積疲労損傷度を求める。そして、寿命判定部２０は、リーフスプリングの累積疲労損傷度を所定の閾値と比較し、累積疲労損傷度が上記所定の閾値に達すると、リーフスプリングの残り寿命が短い要警報状態であると判定する。【選択図】図３
Bibliography:Application Number: JP20200149408