文档介绍：4343532DSR艿课程设计羄螺旋千斤顶膁5456fgfsde蚈班级:螄学好:节姓名:2011/4/26膈蒄莄虿薇芅1螺杆的设计与计算------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------¢及螺纹工作圈数u-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------12膄6螺旋千斤顶的效率----------------------------------------------------------------------12膁7参考文献-----------------------------------------------------------------------------------、梯形与锯齿形,常用的是梯形螺纹。螇梯形螺纹牙型为等腰梯形,牙形角α=30º,梯形螺纹的内外螺纹以锥面贴紧不易松动。