Jumping phenomena and prediction of jumping torque in timing belt drives

In order to prevent timing belt jumping, which often occurs under high loads, a practical jumping torque prediction formula was studied and the following results were obtained. (1) Jumping occurs when the amount of belt elongation on the tight side span due to the increase in load after the slack si...

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Main Authors: Kiyoshi OKURA, Susumu OSAKI, Takumi MIZUMOTO, Shuhei NISHIDA, Yuji MARUYAMA
Format: Article
Language:Japanese
Published: The Japan Society of Mechanical Engineers 2021-12-01
Series:Nihon Kikai Gakkai ronbunshu
Subjects:
Online Access:https://www.jstage.jst.go.jp/article/transjsme/88/905/88_21-00250/_pdf/-char/en
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author Kiyoshi OKURA
Susumu OSAKI
Takumi MIZUMOTO
Shuhei NISHIDA
Yuji MARUYAMA
author_facet Kiyoshi OKURA
Susumu OSAKI
Takumi MIZUMOTO
Shuhei NISHIDA
Yuji MARUYAMA
author_sort Kiyoshi OKURA
collection DOAJ
description In order to prevent timing belt jumping, which often occurs under high loads, a practical jumping torque prediction formula was studied and the following results were obtained. (1) Jumping occurs when the amount of belt elongation on the tight side span due to the increase in load after the slack side tension becomes zero is equal to the amount of belt elongation due to the belt lifting on the pulley when the lifting reaches the belt tooth height in the whole wrapping area. A jumping torque prediction formula was derived based on this mechanism. The prediction formula includes parameters such as pulley diameter, span length, wrapping angle, belt tooth height, belt extensional rigidity, initial tension, and belt speed. (2) To compensate for the difference between the basic theory of frictional transmission applied in the prediction formula and the actual phenomenon, four correction factors were introduced for the amount of belt elongation caused by the belt lifting, etc., and physical properties of belt teeth. This makes it possible to predict the jumping torque of not only the driven pulley but also the driving pulley, and to expand the application range and improve the prediction accuracy. (3) The four correction factors were obtained by running tests using curvilinear profile S8M type belt, but it was shown that they are also applicable to a trapezoidal profile L type belt. (4) Jumping tests at rest with the driven pulley shaft fixed were conducted, and it was confirmed that the jumping torque of the driving pulley at running was about twice that of the driven pulley, and almost equal to that of the driving and driven pulleys at rest.
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spelling doaj.art-c86e625d35d24099af427c5b43f74e5c2022-12-22T02:31:06ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612021-12-018890521-0025021-0025010.1299/transjsme.21-00250transjsmeJumping phenomena and prediction of jumping torque in timing belt drivesKiyoshi OKURA0Susumu OSAKI1Takumi MIZUMOTO2Shuhei NISHIDA3Yuji MARUYAMA4Mitsuboshi Belting Ltd.Mitsuboshi Belting Ltd.Mitsuboshi Belting Ltd.Mitsuboshi Belting Ltd.Mitsuboshi Belting Ltd.In order to prevent timing belt jumping, which often occurs under high loads, a practical jumping torque prediction formula was studied and the following results were obtained. (1) Jumping occurs when the amount of belt elongation on the tight side span due to the increase in load after the slack side tension becomes zero is equal to the amount of belt elongation due to the belt lifting on the pulley when the lifting reaches the belt tooth height in the whole wrapping area. A jumping torque prediction formula was derived based on this mechanism. The prediction formula includes parameters such as pulley diameter, span length, wrapping angle, belt tooth height, belt extensional rigidity, initial tension, and belt speed. (2) To compensate for the difference between the basic theory of frictional transmission applied in the prediction formula and the actual phenomenon, four correction factors were introduced for the amount of belt elongation caused by the belt lifting, etc., and physical properties of belt teeth. This makes it possible to predict the jumping torque of not only the driven pulley but also the driving pulley, and to expand the application range and improve the prediction accuracy. (3) The four correction factors were obtained by running tests using curvilinear profile S8M type belt, but it was shown that they are also applicable to a trapezoidal profile L type belt. (4) Jumping tests at rest with the driven pulley shaft fixed were conducted, and it was confirmed that the jumping torque of the driving pulley at running was about twice that of the driven pulley, and almost equal to that of the driving and driven pulleys at rest.https://www.jstage.jst.go.jp/article/transjsme/88/905/88_21-00250/_pdf/-char/entiming beltjumping torqueprediction formulabelt elongationbelt liftingdriving pulleydriven pulleycorrection factorjumping test at runningjumping test at rest
spellingShingle Kiyoshi OKURA
Susumu OSAKI
Takumi MIZUMOTO
Shuhei NISHIDA
Yuji MARUYAMA
Jumping phenomena and prediction of jumping torque in timing belt drives
Nihon Kikai Gakkai ronbunshu
timing belt
jumping torque
prediction formula
belt elongation
belt lifting
driving pulley
driven pulley
correction factor
jumping test at running
jumping test at rest
title Jumping phenomena and prediction of jumping torque in timing belt drives
title_full Jumping phenomena and prediction of jumping torque in timing belt drives
title_fullStr Jumping phenomena and prediction of jumping torque in timing belt drives
title_full_unstemmed Jumping phenomena and prediction of jumping torque in timing belt drives
title_short Jumping phenomena and prediction of jumping torque in timing belt drives
title_sort jumping phenomena and prediction of jumping torque in timing belt drives
topic timing belt
jumping torque
prediction formula
belt elongation
belt lifting
driving pulley
driven pulley
correction factor
jumping test at running
jumping test at rest
url https://www.jstage.jst.go.jp/article/transjsme/88/905/88_21-00250/_pdf/-char/en
work_keys_str_mv AT kiyoshiokura jumpingphenomenaandpredictionofjumpingtorqueintimingbeltdrives
AT susumuosaki jumpingphenomenaandpredictionofjumpingtorqueintimingbeltdrives
AT takumimizumoto jumpingphenomenaandpredictionofjumpingtorqueintimingbeltdrives
AT shuheinishida jumpingphenomenaandpredictionofjumpingtorqueintimingbeltdrives
AT yujimaruyama jumpingphenomenaandpredictionofjumpingtorqueintimingbeltdrives