The spline shaft is a kind of mechanical transmission. The flat key, half-circle key, and oblique key are the same, all of which transmit mechanical torque. There is a longitudinal keyway on the surface of the shaft, and the rotating part sleeved on the shaft also has a corresponding keyway, which can be retained. Rotate synchronously with the axis. While rotating, some can also slide longitudinally on the shaft, such as gearbox shift gears.
- Function: It is a kind of mechanical transmission, and the flat key, half-circle key and oblique key have the same functions, all of which transmit mechanical torque.
- Structure: There is a longitudinal keyway on the outer surface of the shaft, and the rotating part sleeved on the shaft also has a corresponding keyway, which can keep synchronous rotation with the shaft. While rotating, some can also slide longitudinally on the shaft, such as gearbox shift gears.
- Application examples: in brakes and steering mechanisms. There is also a telescopic shaft, which is composed of inner and outer tubes, the outer tube has internal teeth, and the inner tube has external teeth, which are sleeved together. When in use, it can extend and contract in the length direction while transmitting the rotating torque.
- Material: 40Cr.
- Heat treatment. The hardened surface hardness is HRC45-50.
The Classification Of Spline Shafts
At present, the common types of spline shafts on the market are roughly divided into two types, one is rectangular spline shafts, which are widely used, such as machine tools, automobiles, airplanes and other machinery; the other is involute spline shafts , Mainly used in those links that require high centering accuracy, large load, and large size.
As one of the important mechanical transmission parts, it is mainly used to transmit mechanical torque. In order to ensure that the rotating part can rotate synchronously with the shaft, the longitudinal keyway needs to be distributed on the outside of the shaft, and the rotating part sleeved on the shaft should have a keyway.
Most of the spline shafts seen on the market are made of 40Cr material, the surface hardness of the material is required to be HRC45-50, and heat treatment is required.
The characteristics of the rectangular spline shaft are very clear, because it relies on the multiple gears on it to work, which makes the load force of the spline shaft very good, plus the shallow tooth root, its stress concentration is also relatively small. At the same time, it performs very well in terms of neutrality and orientation.
The strength between the shaft and the hub of the spline shaft is significantly weakened, so the process is not very complicated during processing, and the accuracy of the product can be improved by properly grinding it.
In addition, let’s take a look at the involute spline shaft. Its characteristic is that the tooth profile is involute. Therefore, when loaded, there will be a certain radial force on the tooth, which can be very effective. The self-centering effect makes the force between each tooth in a uniform state, which greatly improves the service life.