第6章键花键无键联接销联接.ppt

中南大学§6- 1 The key joint Chapter 6 The coupling between the axle and the hub §6- 2 The spline coupling §6- 3 The mould surface coupling §6- 4 The pin joint 中南大学§6- 1 The key joint and The spline coupling Function : hoop location and carry-over moment between the axle and the hub types of the key joint Type : straight key,woodruff key,taper key,tangent key. 1). straight key joint Working surface Features : well-centering, assemble and disassemble easy. Types plain key guide key Gap Axle 中南大学 Structure Single round head(model C) Round head(model A) Flat head(model B) Model A Model B Model C disc cutter A thin straight key: its height is about 60%~70% height of normal key,often used in thin-wall structure and hollow shaft where radical size limited. 中南大学 Draw key screw Guide straight key fixing crew The hub can shift in axle to form moving joint. 滑移距离较大时,平键过长,制造困难,故可采用滑键。 Structure features : longer in length,fixed by screw. The screw is made in the key to easy disassemble. Draw key screw fixing crew 中南大学 The double-dog sliding key Structure features : it has two dogs in its ends,it is fixed in the hub,its length is shorter than the key seat. 中南大学 The round-dog sliding key Structure features : single-round-dog , fixed in the hub. 中南大学 Table 6-1 The sizes of normal straight key and key seat ( GB1095- 79,GB1096-79 ) Model A Model B Model C b h R=b/2 C× 45 ? or r 1L LL bh btd - t bt 1 d+t 1 Example : round-ended key(model A): K16 × 100 GB1096-79 square key (model B): KB16 × 100 GB1096-79 Single-round-ended key(model C) : KC16 × 100 GB1096-79 d 中南大学 d b h C or r L t t 1 Radius r Continued T 6-1 Sizes of key Key seat Diameter of axle From 6~8 2 2 6~20 1 〉 8~10 3 3 ~ 6~36 ~ 〉 10~12 4 4 8~45