键和花键的公差与检测.ppt

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1、第6章键和花键的公差与检测Chapter6Thetolerancesandtestsofkeysandsplines一、键和花键的作用Thefunctionsofkeysandsplines键与花键常用于轴与轴上的传动件之间的可拆卸联结:Keysandsplinesareusuallyusedatthedetachableconnectionswhicharebetweenthedrivingmediumsofshaftsandonshafts.1、传递转矩和运动Transmittorquesandmovements.2、当配合件之间要求作轴向移动时，起

2、导向作用Theyplaytheguidingroleswhenitisrequiredtomakeaxialmovementsbetweenmatchingparts.二、键和花键的分类Theclassificationsofkeysandsplines键：平键、半圆键、切向键和楔形键联结Keys:flatkeys,woodruffkeys,tangentialkeysandwedgebonds.花键：矩形花键、渐开线花键和三角形花键联结。Splines:Squaresplines,involutesplinesandtriangularsplineconn

3、ections.三、平键配合的精度设计Theprecisiondesignsofflatkeyfits包括：尺寸精度设计形位精度设计表面粗糙度的精度设计Including:SizeprecisiondesignsFormandpositiondesignsTheprecisiondesignsofsurfaceroughnessesThetypesofkeysFlatkeyRoundkeyTaperkeyThelabelofkeysSuchas:b=18,h=11,L=100roundcommonflatkey’slabelisKeyC18x100GB10

4、96-791、尺寸精度设计（1）Sizeprecisiondesign(1)平键联结的基本构成：由键、轴键槽、轮毂键槽构成。在工作时，通过键的侧面与轴槽和轮毂槽的侧面相互接触来传递转矩。Thebasicformsofflatkeyconnection:Itisformedbykey,keywayandwheelhub.wheninworking,ittransmitstorquesthroughthemutualcontactbetweenthesidefaceofkeyandthesidefaceofwheelhub.配合尺寸：键和轴槽、轮毂槽的宽度尺寸。

5、Fitdimensions:Thewidthdimensionsofkeys,axialtroughsandwheelhubs非配合尺寸：如键高、键长、轴槽深、轮毂槽深等。Nonfitdimensions:Suchaskeyheight,keylength,axialtroughdepthandwheelhubdepth.AALbhd-t1d+t2t1t2AA表6-1普通平键的键槽的剖面尺寸及极限公差(摘自GB/T1095-2003)mmTable6-1Thesectionsizesandlimitsizesofcommonflatkey’ssections

6、izesofthekeygroovesmm轴键键槽公称直径d键尺寸b×h宽度b深度半径r基本尺寸b轴槽宽与毂槽宽的极限偏差轴t1毂t2松联结正常联结紧密联结轴H9毂D10轴N9毂JS9轴和毂P9基本尺寸极限偏差基本尺寸极限偏差minmax≤6～82×22+0.0250+0.060+0.020-0.004-0.029±0.0125-0.006-0.03l1.2+0.101.0+0.1000.080.16>8～lO3×331.81.4>10～124×44+0.0300+0.078+0.0300-0.030±0.015-0.012-0.0422.51.8>12～1

7、75×553.02.30.160.25>17～226×663.52.8>22～308×78+0.0360+0.098+0.0400-0.036±0.018-0.015-0.0514.05.0+0.203.3+0.200>30～3810×8103.30.200.40>38～4412×812+0.0430+0.120+0.0500-0.043±0.0215-0.018-0.0615.03.3>44～5014×9145.53.8>50～5816×10166.04.3>58～6518×11187.04.4>65～7520×1220+0.0520+0.149+0.06

8、50-0.052±0.026-0.022-0.074