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The taper of the Z-shaped shaft hole is 1:10.

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The coupling key is used to connect the shaft and the parts on the shaft for circumferential fixation to transmit torque. For example, the gear/pulley/coupling is connected to the shaft. 

The spline connection is composed of multiple key teeth and key grooves on the shaft and the hub hole. The side of the key tooth is the working surface, and the torque is transmitted by the extrusion of the side of the key tooth.

The spline connection has higher bearing capacity, high centering accuracy and good guiding performance, and can realize static connection or dynamic connection. It can also play a convenient role in disassembly and assembly. Therefore, it is widely used in aircraft, automobiles, tractors, machine tools and agricultural machinery.

In the key connection assembly, the key (generally made of 45-gauge steel) is a mechanical part used to connect the parts on the shaft and fix them in the circumferential direction to achieve torque transmission. The connection types are loose key connection, tight key connection and spline connection.

Key points of the assembly process of key connection

(1) Before assembly, check the straightness of the key, the symmetry and parallelism of the keyway to the axis.

(2) There is usually a gap between the two sides of the common flat key and the shaft keyway. During heavy load, impact and bidirectional use, there must be interference. The arcs at both ends of the key should be free of interference. There should be a gap of 0.1mm between the key end and the shaft groove.

(3) The bottom surface of the ordinary flat key of the coupling and the bottom surface of the keyway should be firm.

(4) The radius of the semi-circular key should be slightly smaller than the radius of the shaft groove, and other requirements are the same as the general flat key.