轴的结构设计（1）初步确定轴的最小直径按扭转强度条件初轴的最小直径（245 页）mmnPCd34.2933.17348.01123322考虑键槽的影响，增大3%，则mmd22.30)03.01(34.29min初定mmd32主动轴最小直径为外链轮处，孔径为mmmmd k34.2932，符合要求。NF V3.13925.538)465.314(4.27921NF V1.14003.13924.27922mNFMaVV?641000463.1392461NF H4.5465.3076924351NF H4.29814.54623352mNMaH?1681000694.2981轴各段的直径和长度如上图所示。轴的强度校核计算NF V5.23255.2615.525.2614.27921NFFFVQV9.4665.23254.2792122mNM aV09.1225.525.2325NF H3.5275.2615.526824351NFFFQHH3.296224353.527112mNM aH58.165243568考虑最坏情况mNMMMaVaHa72.20509.12258.1652222mNT47.264mNTMMae26047.2646.072.2052222计算危险截面处轴的轴的直径轴材料选用45 钢，调质处理，查得（248）MPaB650，得MPab601，则mmMdbe4.26601.0102601.03331考虑到键槽对轴的削弱，将到d 值加大 5%，故mmmmd72.274.2605.1mmmmd k72.2732，符合要求。
