楔键联接：键的上下两表面是工作面，键的上表面和轮毂键槽底面均有1∶100的斜度，装配后，键即楔紧在轴和轮毂的键槽里，工作表面产生很大预紧力。
Wedge key connection: the upper and lower two surfaces of the key are the working faces. The upper surface of the key and the bottom of the hub keyway h***e 1 to 100 slope. After assembly, the key is wedged tightly in the keyway of the shaft and hub, and the working surface has a large pre tightening force.
花键联接按齿形的不同，可分为矩形花键和渐开线花键两类，这两类花键均已标准化。
矩形花键的定心方式为小径定心，即外花键和内花键的小径为配合面。其特点是定心精度高，定心的稳定性好，能用磨削的方法消除热处理引起的变形。
The spline connection can be divided into two types: rectangular spline and involute spline. The two kinds of spline are standardized.
The centering way of the rectangular spline is the ***all diameter centering, that is, the ***all diameter of the outer spline and the inner spline is the matching surface. It is characterized by high centering precision and good stability of centering. It can be used to remove the deformation caused by heat treatment by grinding.
装夹后产品靠近活动钳口附近容易上翘、抬起，多次装夹一致性差。传统机用虎钳的螺旋副间隙较大，在使用中会产生较大振幅的振动；而活动座和虎钳体之间的滑动接触面较大，采用的间隙也较大。
After the clamping, the product is easy to and lifted near the movable jaw, and the cistency of the clamping is poor many times. The spiral pair clearance of traditional machine vice is bigger, which will cause large amplitude vibration in use. The sliding contact between movable seat and jaw vice body is larger, and the gap used is bigger.