机械制造与设计.齿轮传动的失效形式。精度、受力分析及计算载荷

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1、课时授课计划第52次课【教学课题】§10-1齿轮传动的失效形式和计算准则§10-2齿轮的材料及热处理§10-3齿轮传动的精度【教学目的】：掌握齿轮传动的失效形式及计算准则。【教学重点及处理方法】：齿轮传动的失效形式及计算准则。处理方法：详细讲解【教学难点及处理方法】：计算准则处理方法：比较讲解【教学方法】:讲授法【教具】：三角板【时间分配】：引入新课5min新课80min小结、作业5minschool)],44housebuildingaswellasmorethan1000copiesofbooks,mor

2、ethan10kindsofcollectionofnewspapersandmagazines,firesburntdown.In1938,theJapaneselearnedthatthenationalGovernmentestablishedinXITangTombrotten"clip"taxes,taxofficerslivein8ofYanDongvillagefarmershome,troopsatnight,Yaowasburnedseveralhouses.1938newmorningof

3、September18,theJapaneseteamwenttothecountryside"sweep"fromthekaiyangvillagelinetoTungYangJiaQiaoyanTemplewallandmetYangJia溇ZhouDana(male)weeksbecauseoflong-termillnessandcan'tworkinthefields,theJapaneseseehisfacefromscratchwithoutcalluses,regardhimas"Shina"

4、,thrustaknifeatthesceneofhisdeath.Thebodywasstabbed7times,wound13.Thesameday,TrangbangvillageheardtheJapanesecometo"mop-up"arehiding,motherof9ZhouGuanbaoZhangAyingtodrilla"drymound",wasdiscoveredbytheJapanese,ashotintheend.Thesameday,is7zhouhaijiangzhigrand

5、fatherZhouYingbaotoescapetheJapanesearmy,wasfoundontheroad,ashotintheend.InMarch1939,theJapanesearmyinYanTombraiding,hasarrested16people,infengqiaocigarettesthismorningbang,killing11peopleontheRiver,Eastmeetingpointinwoodqiaotuintheafternoonkilling4peopleon

6、theRiverside.GuTongisaJapanesegospeaktheShanghaidialect,latertobecalledGuTongas"killleft."OnJanuary18,1943,theelves,fivethousandorsixthousand,waterandlandgohandinhand"mop-up"jiaxingareawestoftherailway,YanTombareafall.March6,NiuShan(CountyGovernmentIIsectio

7、nchief)carryingitschildNiuJun(strictTombseventhdistrictChang)andtheDistrictAssistantYuXuchu,andplayersJinFuqin,andShenBaosheng,sixpeoplereceivedWujiangundergroundCountyGovernmentnotification第52次课【提示启发引出新课】齿轮传动要求运转平稳且有足够的承载能力。在设计齿轮传动时，要根据工作要求，选定齿轮材料、齿面硬度及精度等

8、级，计算轮齿承受的载荷与转速的大小。进而判断齿轮的失效形式，确定计算准则，进行强度的计算，确定传动参数和结构。【新课内容】§10-1齿轮传动的失效形式和计算准则一齿轮传动的失效形式1轮齿折断机理：齿根的弯曲应力及应力集中，在多次的重复作用下，齿根圆角处会产生裂纹，裂纹扩展导致疲劳折断。当轮齿受到过载或冲击载荷时会发生过载折断。发生部位：齿根。防止措施：增大齿根圆角半径，提高齿面硬度，降低表面粗糙度。