螺纹联接和螺旋传动.ppt

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1、Chapter5Screwjointsandscrewdrive§5－1Screwthread§5－2TypesofScrewthreadandStandardjoint§5－3Pre-tighteningofscrewjoints§5－5Strengthcalculationofscrewjoint§5－7Materialandadmissiblestressofscrewbolt§5－8Measuresofimprovingintensityofscrewboltjoint§5－9Screwdrive§5－4L

2、oosenesspreventingofscrewjoint§5－6DesignofjointofscrewboltgroupⅠFormingofscrewthread§5－1Screwthreadd2Helicalline----thelocusofamovingpointwhichrotatesaroundaxis,andatthesametimemovesalongtheaxisinconstantvelocityonthesurfaceofcylinder。Screwthread----Aplanefigu

3、removesalongahelicallineandkeepsitselfthroughtheaxisofthecylinderwhenmoving.Thenscrewthreadisformed.ScrewthreadAccordingtothetypeoftoothofscrewthreadTypesofscrewthreadAccordingtothedirectionofrotationofscrewthreadAccordingtothenumberofhelicallineAccordingtoins

4、ideandoutsidesurfaceofsolidofrotationAccordingtoThefunctionofscrewthreadAccordingtotheshapeofbodyofrevolutionRectanglescrewthreadTrianglescrewthreadTrapeziumscrewthreadHacklescrewthreadThetypeoftoothofscrewthreadSquarethreadTrianglethreadTrapezoidalthreadButtr

5、essthread15º30º3º30ºRectanglescrewthreadTrianglescrewthreadTrapeziumscrewthreadHacklescrewthreadright-handthreadleft-handthreadAccordingtothetypeoftoothofscrewthreadTypesofscrewthreadAccordingtothedirectionofrotationofscrewthreadAccordingtothenumberofhelicalli

6、neAccordingtoinsideandoutsidesurfaceofsolidofrotationAccordingtoThefunctionofscrewthreadAccordingtotheshapeofbodyofrevolutionRectanglescrewthreadTrianglescrewthreadTrapeziumscrewthreadHacklescrewthreadright-handthreadleft-handthreadsingle-startthreadmulti-star

7、tthreaddouble-startthreadsingle-startthreadPSS=2PPSPS=Pnthread:S=nPn≤4AccordingtothetypeoftoothofscrewthreadTypesofscrewthreadAccordingtothedirectionofrotationofscrewthreadAccordingtothenumberofhelicallineAccordingtoinsideandoutsidesurfaceofsolidofrotationAcco

8、rdingtoThefunctionofscrewthreadAccordingtotheshapeofbodyofrevolutionRectanglescrewthreadTrianglescrewthreadTrapeziumscrewthreadHacklescrewthreadright-handthreadleft-handthreadsingl