pulleysarenotparalleltimingbeltfailure.Timingbeltrunningonatimingbeltpulleysonbothsidesh***eribsandatimingbeltpulleysonbothsidesofribswhenthetwotimingbeltpulleysarenotparallel,thenthetimingbeltwillbepartofthetimingbeltpulleysmovewithnoribs,noribstimingbeltwheelinthispartofthetimingbeltwillbearalltheloadandmaybeintherunningforsometimetoproduceaconcentratedwearareas.Theconcentrationofmostofthetoothsurfacewear,nowearelsewhere.Cracksmayh***erootsinthewearareasbelow.Timingbeltstrengthortoothsurfacefatiguewilleventuallyleadtoprematuretimingbeltfailure.Thetimingbeltatruntime,thetimingbeltaxleatanangle,ortimingbelttooth-shapedtaperproblemexistsintheprocessingloadunevenlyappliedtothetimingbeltonthetoothedunevenextrusion.Thetimingbeltfailureoftenbegintotearfromthetoothrootcracking,orfromcarryingtensionthetimingbeltsideandextendedtothewholetimingbeltwidth,eventuallyleadingtothetimingbelttoothshear.Relativelylargeduetofibertension,timingbeltsqueezeserioussidemayalsoappear***iouswearandtear,andthetimingbeltmayclimboutoforrolledriboftheDepartmentoftimingbeltpulleys.BRECO同步带同步带轮不平行导致同步带失效同步带运行在一个同步带轮两边都有挡边和一个同步带轮两边都没有挡边时，如果两个同步带轮不平行，那么同步带会部分向没有挡边的同步带轮移动，无挡边同步带轮中这部分同步带将会承受全部负载并且可能在运行一段时间后产生一个集中磨损区域。大部分齿面的集中磨损，其它地方没有磨损。在磨损区域下面可能会有根部裂缝。BRECO同步带强度或齿面疲劳***终都会导致同步带的过早失效。同步带在运行时，同步带轮轴成一定角度，或同步带轮齿形在加工时存在锥度问题，由于施加在同步带上的负载不均匀，带齿之间会出现不均匀的挤压。同步带失效经常从齿根开裂处或从承载张力***大的同步带侧面开始撕裂并扩展到整个同步带宽度，***终导致同步带齿部剪切。由于纤拉力比较大，同步带挤压严重的一侧可能也会出现明显的磨损，并且同步带有可能爬出或滚到同步带轮挡边之处。显示了高纤拉力导致了同步带一边严重的磨损。同步带运行在不平行有挡边的同步带轮时，如果同步带被挤压在两个相对的挡边中，会导致同步带两侧严重磨损。在这种情况下，同步带会从齿根裂缝或从两侧撕裂。这种撕裂***终会扩展到整个同步带，导致同步带齿部剪切。Duetoimproperoperationcausedbythetimingbeltbendreas***:improperstorage,improperpackingandtimingbeltinstallationandinstallationofimproperoperation.Therunmayh***ebeenjumpingtoothtimingbeltinthecaseoflowtensionuntilitreachesanacceptabletension,aphenomenoncalledautomatictensioning.Automatictensionfromthetimingbeltpulleysroundslotcanbemostclearlyobservedintheloosesideofthetimingbeltortimingbeltteethinto.Whenthetimingbeltautomatictensioner,timingbeltteethjumpoutofthetimingbelttoothtimingbeltpulleysroundslotuntilthetimingbelttightsidetostrengthenthetensionforceintothetimingbeltpulleysroundslot.Timingbeltpulleywheelgrooveisforcedtoreturn,oftenresultingindramatictimingbeltandpulleycontactpoints,theinstantaneousbending,thisbendingwillcausethetimingbeltwiredamage.Thispartofthecorewireinjuryiscalledabend.Tightsidetensionthetimingbeltteethintothepulleywheelgroove,thenthetimingbelttoskipteeth,alsowillproduceabendingfailureortimingbelttoothdamage.Timingbeltintothediameteristoo***allpulleywillcausethetimingbeltwiredamageorbendingfailure.Pulleyandbackidlerpulleybelowthestipulatedminimum,timingbeltandtimingbeltpulleys,idlerwheelorbyhandtothe***alleracuteanglebendtimingbeltwillcausethetimingbeltbendingfailure.Tran***issionentryofforeignmatteralsomakeabendtimingbelt,theywillle***ethetimingbeltandtimingbeltpulleystoformasharpcorner,sothatthetimingbeltwirebending.Thetimingbeltforciblyprytooltoalsomakethetimingbeltpulleysdamage.Improperuseoftools(suchasascrewdriver)onthetimingbeltafterinjury,thetimingbeltwillnotimmediatelybeinvalidatedbytheentryofforeignmatterorinstall,butthetimingbeltoveralllifewilldecline.Thetimingbeltbendingfailuremodemanifestsitselfinthefracturesurfacewireintoastraightline.Whenthetimingbeltwirebentintoavery***alldiameter,thisfailuremodeoccurs.Sharpbendwillmakethetimingbeltwirefiberbendingunderhugepressureanddamage,sothetimingbelt'stensilestrengthdecreased.Thetimingbeltbendingfailureisthemostcommonfailuremode,usuallyassociatedwiththetimingbeltoperatingproperly,installthetensionistoolow,thediameterofthepulleyistoo***allandthereareforeignbodiesinsidethepulley.BRECO同步带折曲失效原因分析由于操作不当所引起的同步带折曲原因有：存放不当、包装不当和同步带安装前和安装时的操作不当。同步带在过低张紧力的情况下运行可能会一直跳齿直到达到可接受的张紧力，这种现象叫做自动张紧。自动张紧在同步带的松边或同步带齿部进入从同步带轮轮槽的地方可***清晰地观察到。当同步带自动张紧的时候，同步带齿部会跳出同步带轮轮槽直到同步带紧边加强的张力迫使同步带齿部再进入到同步带轮轮槽中。同步带在***回到带轮轮槽时，常常导致同步带与带轮接触点发生剧烈、瞬时的弯曲，这种弯曲会导致同步带芯线受损。这部分芯线损伤就被称为折曲。如果紧边张力不能使同步带齿部进入带轮轮槽，则同步带会产生跳齿，也同样会产生折曲失效或同步带齿部损伤。同步带进入直径过小的带轮时，也会导致同步带芯线受损或折曲失效。带轮和背部惰轮低于规定的***小值、同步带和同步带轮间有惰轮甚至用手以较小的锐角弯曲同步带，都会导致同步带折曲失效。传动系统有***进入也同样会使同步带产生折曲，他们会使同步带与同步带轮间形成个尖角，使这一点的同步带芯线出现折曲。用工具把同步带强行撬到带轮上也同样会使同步带损坏。在受到***进入或安装时使用工具不当（如螺丝刀）对同步带损伤后，同步带不会立即失效，但是同步带总体寿命会下降。同步带折曲失效模式通常表现为断裂面芯线成直线排列)