最新第十二章-蜗杆传动分析教学讲义PPT.ppt

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1、第十二章-蜗杆传动分析蜗杆传动图3、阿基米德蜗杆在轴剖面：直线齿廓法剖面：凸曲线垂直轴剖面：阿基米德螺线车削加工，不能磨削，精度低。蜗轮滚刀：与蜗杆尺寸相同在中间平面上可看成直齿齿条与渐开线齿轮啮合4、渐开线蜗杆若t>80℃或有效的散热面积不足时,则必须采取措施,以提高其散热能力常用措施:1、合理设计箱体结构,铸出或焊上散热片,以增大散热面积2、在蜗轮轴上装置风扇,进行人工通风,以提高散热系数四、蜗杆传动热平衡计算3、在箱体油池内装设蛇形冷却水管4、采用压力喷油循环润滑§12-7蜗杆和蜗轮的结构一蜗杆的结构车削

2、：有退刀槽，二、蜗轮的结构蜗轮可制成整体式或装配式1整体式2齿圈压配式3螺栓联接式4镶铸式斜齿圆柱齿轮—蜗杆减速器齿轮传动、蜗杆传动的应用圆柱齿轮减速器ImproveWritingwithAttributiveClauseandAppositive使用定语从句和同位语提升写作2018.10.14Recall用恰当的关系词填空1．IborrowedthebookSherlockHolmesfromthelibrarylastweek,________myclassmatesrecommendedtome.2．Ac

3、ompany________profits(利润)fromhomemarketsaredecliningmayseekopportunitiesabroad.3．We'llreachthesalestargetsinamonth___________wesetatthebeginningoftheyear.4．Amongthemanydangers_________sailorshavetoface,probablythegreatestofallisfog.whichwhose(Which/that)(Whi

4、ch/that)Recall5．Manycountriesarenowsettingupnationalparks______animalsandplantscanbeprotected.6．Wehavelaunchedanothermanmadesatellite,______isannouncedintoday'snewspaper.7．Finallyhereachedalonelyisland___________wascompletelycutofffromtheoutsideworld.8．Thate

5、vening,______Iwilltellyoumoreaboutlater,Iendedupworkingverylate.whichWhich/thatwhichwhereRecall用定语从句合并下列简单句Mr. Smith is a teacher. He is very strict.2.ThegirliscalledMary.Isawheryesterday.3.Thisisthefactory.Ivisiteditlastyear.4.ThehouseisTom’s.Itsdoorfacesso

6、uth.Mr.Smithisateacherwhoisverystrict.ThegirlwhomIsawyesterdayiscalledMary.Thisisthefactorywhich/thatIvisitedlastyear.ThehousewhosedoorfacessouthisTom’sWritingpractice根据提示，完成下面的小作文。1．珍妮(Jenny)，是一个著名的小说家(novelist)，上周出版了一部新的小说。(publish)2．它描绘了一次不同寻常的冒险经历。(extra

7、ordinaryadventure)3．主人公(hero)骑骆驼来到一个废弃的城堡。(camel，desert)4．在城堡里他遇到了一位美人(beauty)。5．他们相爱了并一起出发去探索神秘的沙漠。(explore)Onepossibleedition:Jennyisafamousnovelist，andshepublishedanewnovellastweek.Itdescribesanextraordinaryadventure.Theherorodeacameltoadesertedcastle，and

8、hemetabeautythere.Theyfellinlovewitheachotherandtheytogethersetofftoexplorethemysteriousdesert.Oneadvancededition:Jenny，whoisafamousnovelist，publishedanewnovellastweek，whichdescribesanextraordin