接触最小安全系数 总工作时间 应力循环次数 接触寿命系数 许用接触应力 验算 由表12.1 已知 NL1?60rnth?60?1?249.423?40880NL2NL16.178?108??i2.889st Hmin?1.05 h?40880 NL1?6.178?108NL2?2.138?108 Zn1?1.10Zn2?1.13 由图12.18 [?[?]?]? ??HLim1ZN1H1SHminHlim2750?1.10?1.05 H2SHlmin?580?1.131.052KT1u?1?bd12u??H1??758.714MPa ??H2??624.190MPa ?H?ZEZHZ?Z??189.8?2.46?0.767?0.994?2?3.351?133197.1772.889?1?264?822.889 ?H?594.845MPa ?H2? 计算表明,接触疲劳强度足够 确定传动尺寸 传动比 中心距 圆整中心距 螺旋角 分度圆直径 齿宽b d1=2a/(i+1)=2×160/(2.889+1)=82.283mm d2=id1=2.889×82.283=237.716mm b?d1??d?0.777?82.283?63.934mm i?Z278??2.889 Z127i?2.889 a?d1(i?1)82?(2.889?1)??159.499 22 取a=160mm ?2?arccosmn(Z1?Z2)3?(27?78)?2a2?160 ?2?10?8?30? d1=82.283mm d2=237.716mm 取b=b2=64mm 齿形系数 应力修正系数 重合度系数 螺旋角系数 齿间载荷分配系数 齿向载荷分布系数 载荷系数 弯曲疲劳极限 弯曲最小安全 齿根疲劳强度计算 B1=69mm YFa1?2.57YFa2?2.23ZV3Z327???28.308 33o'''cos?2cos10830Z478???81.778 cos3?2cos310o8'30''ZV4由图12.21 由图12.22 YSa1?1.62?av??1.88?3.2?????11?????cos???Zv1Zv2??YSa2?1.78 Y??0.691 ?1???1o'''??1.88?3.2?????cos10830?1.701 ?28.30881.778???0.750.75Y??0.25??0.25??0.691?av1.701Y?min?1?0.25???1?0.25?1?0.75 Y??0.915 10O8'30''Y??1????1?1??0.915?Y?minO0120120?O由表12.11注 KF??1.737 KF??1.27 ????Y??2.756?2.348 1.669?0.691前已求得 KF??1.737?2.348 由图12.14b/h?64/(2.25?3)?9.481 K?KAKVKF?KF??1.25?1.15?1.737?1.27 K=3.171 SFmin?1.25 由图12.23c 系数 由表12.14 ?Flim1?600MPa?Flim2?450MPa应力循环次数 已知 NL1?6.178?108NL2?2.138?108Yn1?0.95Yn2?0.97 弯曲寿命系数 由图12.24 尺寸系数 许用弯曲应力 验算 由图12.25 Yx?1.0 ?600?0.95?1.01.25450?0.97?1.01.25??F1???Flim1YN1YXSFlim ??F2???Flim2YN2YXSFlim???F1??456MPa ??F2??349.2MPa 2kT?F1?YFa1Ysa1Y?bd1mn2?3.171?133197.177?2.57?1.62?0.6941 64?82.283?3?153.828Mpa?[?F1]??F2??YFa2Ysa2?F1YFa1Ysa12.23?1.78?153.828 2.57?1.62?146.660Mpa?[?F2]弯曲疲劳强度足够
五.轴的设计
轴长度的估算 斜齿螺旋角 齿轮直径 (1)对轴1进行设计 取L1=95mm 取L2=135mm 取L3=60mm ??0.025a?2?0.025?(160?136)?2?9.4 C1?20 C1?16 M?(Z?1)e?2f?(4?1)?15?2?10?65 F???C1?C2?8?9.4?20?16?8?53.4 ME?K?H?G?F?D?226520??20?6?10?53.4?15? 22?96.9mmb?bEbL2??D?a?34?b4?c?22222069?6441??15?10??64?15? 222?137mmbEL3?1?a?D?224620??15?15? 22?63mmL1? ??10o26'12'' d1=61.014mm 带对轴上载荷 小齿轮受力 转矩 圆周力 径向力 轴向力 已知 FQ?929.546N T=40044.758N·mm Ft1?2T1/d1?2?40044.758/61.014 Fr1?Ft1tan?n/cos??1312.642?tan200/cos10o26'12'' F?1?Ft1tan??1312.642?tan10o26'12'' Ft1?1312.642NFr1?485.800NF?1?241.783N
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