Flat Key Technique

Selection of flat key size: the cross-sectional size b of the flat key × H is selected from the standard based on the diameter d of the shaft. The length L of the key is generally determined based on the width of the wheel hub, requiring the key length to be slightly shorter than the wheel hub by 5-10 mm and in accordance with the length series values.
Selection of flat key type: The type of flat key should be selected based on the structure, usage characteristics, and working conditions of the key connection. When selecting, the following aspects should be considered: the size of the torque that needs to be transmitted; Whether the parts connected to the shaft need to slide along the shaft and the length of the sliding distance; Neutral requirements for connections; Does the key need to have an axial fixing effect; And the position of the key on the shaft (in the middle or end of the shaft), etc.
Strength verification of flat key connection:
The main failure forms of flat key connections are crushing and wear of the working surface (for dynamic connections). Unless there is a severe overload, there is generally no occurrence of key cutting