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Fr9?5832.30N;d31?47mm;L1?243.25mm;L2?101.75mm;L?345mm
1)求水平面内支反力RHA、RHB和弯矩MHC
RHA+RHB=Ft9 RHAL1?RHBL2
由以上两式可得RHA=4340.25N,RHB=10375.97N,MHC=1055763.65N.mm 2)求垂直面内支反力RVA、RVB和弯矩MVC
RVA+RVB=Fr9
1Fa9d9?RVBL 2由以上两式可得RVA=2119.01N,RVB=4930.70N,MVC左=354235.01N.mm,
Fr2L1?MVC右=718570.64N.mm
按第三强度理论得:
222222M?MH?MV右??T31?1055763.65?718570.64?0.6?993490?1618024.422Nmm??32M32?1618024.422??158.82MPa?????400MPa 33?d313.14?47(2)中间轴强度校核
T2?472090Nmm;Fa2?2830.47N;Ft2?6569.12N; Fr2?2603.47N;Ft12?16860.36N;Fr12?6136.67N; d2?135.52mm; d26?126mm;d?53.95mm;
L1?58.875mm;L2?271mm;L3?55.125mm;L?360mm
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Fr2 Fa2 Ft2 Fr12 Ft12 RHA RVA Ft12 C D RHA Ft2 RHB RVB RHB L2 L L3 L1 Fr2 M Fr12 RVA RVB 348496.92Nmm 397560.24Nmm 132314.49Nmm 68008.99Nmm 142135.77Nmm 394990Nmm
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1)求水平面内支反力RHA、RHB和弯矩MHC、MHD
RHA+RHB+Ft2=Ft12
Ft2L1+RHBL?Ft12?L1?L2?
由以上两式可得RHA=-13768.32N,RHB=13468.48N,
MHC=-397560.24N.mm,MHD=348496.92N.mm
2)求垂直面内支反力RVA、RVB和弯矩MVC、MVD
RVA+RVB=Fr2+Fr12
1Fr2L1?Fa2d2?Fr12?L1?L2??RVBL
2由以上两式可得RVA=2355.29N,RVB=5493.17N,MVC左=68008.99N.mm,
MVC右=132314.49N.mm,MVD=142135.77N.mm
按第三强度理论得:
222222MC?Mvc右?MHC??T2?132314.49?397560.24?0.6?472090?518817.43N.mm
2MD?MVD?MHD??T22?142135.772?348496.922?0.6?4720902?485039.11 N.mm
?C?32M32?518817.43??42.30MPa?????400MPa33?d313.14?5032M32?485039.11??31.48MPa?????400MPa 33?d313.14?53.95
?D?3.3轴承及轴承校核
3.3.1一轴轴承校核
T31?993490Nmm;Fa9?6108.17N;Ft9?14716.19N;Fr9?5832.30N
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d31?44mm;L1?243.25mm;L2?101.75mm;L?345mm。
RV2 RH2 RV1 FS1 Fa9 Ft9 RH2 Fr9 RH1 RH1 FS2 Ft9 L1 L RV2 M RV1 L2 Fr9 854641.53Nmm 56305.80Nmm 450437.61Nmm 866310Nmm 1、轴及轴承的校核
①由于工作转速和轴颈的要求,初选一轴轴承型号为30208,正装。
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②一档时传递的轴向力最大,Fa9?6108.17N,T31?993490 Nmm
③求水平面内支反力RH1、RH2和弯矩MH
RH1+RH2=Ft9 Ft9L1?RH1L
由以上两式可得RH1=9509.23N,RH2=3701.75N,
MH=854641.53N.mm
④求垂直面内支反力RV2、RV1和弯矩MV左、MV右
RV2+RV1=Fr9
1Fa9d9?RV1L 2由以上两式可得RV1=5011.84N,RV2=243.88N,MV左=56305.80N.mm,
Fr9L1?MV右=450437.61N.mm
按第三强度理论得:
222222M?MH?MV??T?854641.53?450437.61?0.6?993490?1176266.12431右N.mm
?C?32M32?1176266.124??95.899MPa?????400MPa 3?d313.14?503 因此轴的强度足够。 ⑤校核轴承寿命
Ⅰ)、求水平面内支反力RH1、RH2和弯矩MH
RH1+RH2=Ft9 Ft9L1?RH1L
由以上两式可得RH1=9509.23N,RH2=3701.75N,
MH=854641.53N.mm
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