Hollow spline shaft is a mechanical transmission, and key, half-round key, the role of the same key, are the transmission of mechanical torque, in the shaft of the appearance of the longitudinal keyway, set on the shaft of the rotating parts also have the corresponding keyway, can be kept synchronized with the shaft rotation. In the rotation at the same time, some can also be in the shaft for longitudinal sliding, such as gearbox shift gears.
Hollow spline shafts are divided into two main types: rectangular hollow spline shafts and involute hollow spline shafts. Rectangular spline shafts are widely used, while involute spline shafts are used for connections with large loads, high centering accuracy, and large dimensions. Rectangular hollow spline shafts are usually used in airplanes, automobiles, tractors, machine tool manufacturing, agricultural machinery and general mechanical drives and other devices. Since rectangular hollow spline shafts work with multiple teeth, they have high load carrying capacity, good centering and guiding properties, while their shallow tooth roots allow for small stress concentrations. In addition, the shaft and hub of the spline shaft have small strength weakening, it is easier to process, and high precision can be obtained by grinding method. Involute hollow spline shafts are used for larger loads, high centering accuracy requirements, and larger size connections. Its characteristics: the tooth profile for the involute, loaded teeth on the radial force, can play a role in automatic centering, so that the teeth of the force is uniform, high strength and long life, the same processing technology and gears, easy to obtain high precision and interchangeability.