1. Classification of Splines

The types of commonly used spline shafts on the market can be roughly divided into three types: one is the rectangular spline shaft, which is widely used in machinery such as machine tools, automobiles, airplanes, etc; Another type is the involute spline shaft, which is mainly used for links with high centering accuracy requirements, large loads, and large dimensions; The third type is triangular splines, used for connecting thin-walled parts.

2. The usage characteristics of splines

Usage characteristics: Due to differences in structural form and manufacturing process, compared with flat key connections, spline connections have the following characteristics in terms of strength, process, and use:

Because more teeth and grooves are directly and uniformly produced on the shaft and hub hole, the coupling force is relatively uniform;

Due to the shallow groove, the stress concentration at the tooth root is relatively small, and the strength of the shaft and hub is weakened less;

With a larger number of teeth and a larger total contact area, it can withstand larger loads;

The alignment between the components on the shaft and the shaft is good, which is important for high-speed and precision machines;

Good guidance is important for dynamic connections;

Grinding methods can be used to improve machining accuracy and connection quality;

The manufacturing process is complex and sometimes requires specialized equipment, resulting in higher costs.

Applicable occasions: Connections that require high centering accuracy, transmit large torque, or frequently slip.

Most of the spline shafts seen on the market are made of 40Cr material, with a surface hardness requirement of HRC45-50 and requiring heat treatment.