Parallel keys (also often called flat keys) are widely used and important, mainly reflected in the following aspects:
1. Transmitting rotational force
Parallel keys are mainly used to reliably transmit the rotational force of the shaft to gears or other rotating parts. In machines with rotating bodies such as motors, reducers, pumps, and engines, parallel keys play a key role to ensure the normal operation of the machinery.
2. Positioning and fixing
Positioning function: In tooling equipment such as milling machine fixtures, parallel keys are often used as positioning elements, especially for occasions where positioning accuracy is not required. The structure is simple, easy to use, and it is not easy to cause deformation of the workpiece, which can ensure the stability of the workpiece during processing.
Fixing function: Through the cooperation of parallel keys and keyways, the parts on the shaft can be effectively fixed to prevent relative movement or loosening, thereby improving the stability and reliability of the machinery.
3. Diverse application scenarios
Parallel keys can be selected and designed according to different usage requirements.
Ordinary parallel keys: With good centering, high positioning accuracy and convenient disassembly and assembly characteristics, they are suitable for most mechanical transmission occasions.
Thin parallel key: suitable for thin-walled structures and small torque, which can reduce the weakening of shafts and holes.
Guided parallel key: The key is fixed to the shaft by screws. It is suitable for occasions where the movement of parts on the shaft is not large. It has the dual functions of guiding and fixing.
4. Industrial application examples
In industrial production, parallel keys are widely used in various mechanical equipment and fixtures. For example, in the process of grooving, milling planes, etc., parallel keys can effectively ensure the relative position between the workpiece and the fixture is stable, thereby improving processing accuracy and work efficiency.
