发布时间 : 星期日 文章(完整版)加热炉装料机蜗轮蜗杆二级减速器更新完毕开始阅读
??arccosdb1?76cos21.56??a1d?arccos??2?2.5? ??29.235a1??76?? ??arccosdb2d?arccos???176.4cos21.56??a2176.4 a2??2?2.5??? ?25.258? 由于没有变位所以端面啮合角?'?t??t?21.56 ?????1.893 ??1.893 bsin?91.2?sin22.905? 纵向重合度????m?n3.14?2.5 ?4.52??1Z??1?Z????0.47 ??14.52?0.47?Z??0.96 螺旋角系数 Z??cos??0.96 KA?1.5 KA?1.5 KV?1.05 KV?1.05 KH?: Ft?2T1/d1?2?177.19/76?4.66kN K AFtb?1.5?4.66?10391.2?76.64N/mm?100N/mm cos? b?cos?cos?n/cos?t?0.93 K2H????/cos?b?1.893/0.932?2.189 KH??2.189 K?b2?b2?KH??A?B??H??1.655 ?1?0.6(d)??(d)?C?103?b1??1?1.17?0.16?(1?0.6?1.22)?1.22?0.61?10?3 ? 91.2?1.655 齿面接触应力 ?H?2.37?189.8?0.47?0.96 ?1.5?1.05?1.655?2.189?46603.38?1?H?452.53N/mm276?91.2?3.38 ?452.53N/mm2 2>计算许用接触应力? HP 13
??HlimZNTZLZVZRZWZXHP?S Hlim 总工作时间t h?10?300?16?48000h 应力循环次数 N L1?60?n1th?60?1?101.43?48000 ?2.92?108ZNT1?1.09 NL2?NL1/i?8.643?107 ZNT2?1.16 接触寿命系数Z NT由图2-27查出 （单向运转取??1） ZW1?ZW2?1.14齿面工作硬化系数 ZX1?ZX2?1.0ZHB2?130W1?ZW2?1.2?1700 ?1.2?(240?130)/1700?1.14 接触强度尺寸系数Z X由表2.18按调质钢查 润滑油膜影响系数取为 SHlim?1.05 Z L1?ZL2?ZR1?ZR2?ZV1?ZV2?1 ?HP1?取最小安全系数SHlim 840.2N/mm2许用接触应力: ? HP2??HP1?710?1.09?1?1?1?1.14?1/1.05730.5N/mm2?840.2N/mm2 ??580?1.16?1?1?1?1.14?1/1.05 接触疲劳强度较为HP2合适,齿轮尺寸无?730.5N/mm2须调整 3〉验算: ?H?452.53N/mm2?min??HP1,?HP2??730.5MPa 中心距a?(d1?d2)/2?(76?257.83）/2 ?166.915mm,圆整取a?167mm 确定因为a?(zz主要1?2)mncos?/2 传动精确的??arccos(z1?z2)mn 2a 尺寸 ?arccos(28?95)?2.5??20?58'39\ 2?167?20?58'39\
14
端面模数:mt?mn/cos??2.5/cos22.977? ?2.715 小齿轮直径 d1?76.032mmd1?mtz1?76.032mm d2?257.967mm大齿轮直径 d2?mtz2?257.967mm b2?92mm齿宽b=91.2mm, b2?92mm , b1?95mm b1?95mm Z3V1?Z1/cos??35.88ZV2?Z2/cos3??121.74 齿根1〉 弯曲 疲劳?FtF?KAKVKF?KF?bmYFaYSaY?Y???FP 强度1nKA?1.5 验算 KA?1.5, KV?1.05, KF??KH??2.189 KV?1.05 YF?1?2.48,YF?2?2.18, KF??2.189YS?1?1.66,YS?2?1.82 YF?1?2.48 Y0.75??0.25?0.75/??v?0.25?Y?2?2?2.18 ?/cos?Fb ?0.25?0.75YS?1?1.661.893/0.932?0.593Y?S?2?1.82 ??4.52, Y??0.81 Y??0.593 b/h?91.2/?2.25?2.5??16.21 Y K??0.81F??1.6 齿根弯曲应力: KF??1.6 ?KFtAKVKF?KF?Y F1?bFa1YSa1Y?Y? 1mn ?1.5?1.05?1.6?2.189?4660 95?2.5?2.48?1.66?0.81?0.593?214.03MPa?F1?214.03MPa?F2??F1?YFa2?YSa2/YFa1/YSa1a?213.00MPa?F2?213.00MPa
15
2〉计算许用弯曲应力? FP ?FlimYSTYNTYVrelTYRrelTYXFP??S Flim?1?270MPa试验齿轮的齿根弯曲疲劳极限?FlimFlim查图2.30 ??Flim2?250MPaFlim1?270MPa，?Flim2?250MPa 另外取 YNT1?0.94 YST1?YST2?2.0,YVrelT1?YVrelT2?1 YNT2?0.98 YRrelT1?YRrelT2?1,YNT1?0.94,YNT2?0.98YX1=YX2?1 由图2.33确定尺寸系数YX1=YX2?1 SFmin?1.25 由表2.17查最小安全系数SFmin?1.25 YST1?YST2?2?270?2?0.94?1?1?1FP1?1.25?406MPaYVrelT1?YVrelT2?YRrelT1?YRrelT2?250?2?0.98?1?1?1FP2?1.25?392MPa ?13〉弯曲疲劳强度验算 ?FP1?406MPa?F1?214.03MPa??FP1 ?FP2?392MPa?合格 F2?213.00MPa??FP2 静强静强度校核,因传动无严重过载,故不作静强度校核 度校核
３．轴的设计和校核计算 ①、蜗杆轴的设计
计算项目 计算内容 计算结果 材料的选择 材料选择45号钢，调质处理?B?650MPa 材料系数 查表有 C=112 估算轴径 d?C3Pn?11232.351420?13.25mm 取dmin?15mm 蜗杆受转矩 T1?15.98N?m
16