Hammashihnapyörä

Hammashihnapyörä, often translated as timing pulley or toothed pulley, is a component used in mechanical power transmission systems. It is designed to engage with a timing belt, which has teeth on its inner surface. These teeth mesh with corresponding grooves on the pulley, ensuring precise synchronization between the driving and driven shafts. This synchronization is crucial for applications where timing is critical, such as in internal combustion engines to synchronize the crankshaft and camshaft, or in 3D printers and CNC machines for accurate positioning.

The primary function of a hammashihnapyörä is to prevent slippage that can occur with smooth pulleys and V-belts. This positive engagement allows for efficient transfer of power without loss of motion or accuracy. The design of the pulley, including the number of teeth, tooth profile, and pitch, is specifically engineered to match the specifications of the timing belt being used. Common materials for hammashihnapyörä include aluminum, steel, and sometimes plastic, chosen based on factors like load requirements, operating environment, and cost. They are typically mounted on shafts using keyways, set screws, or splines to ensure a secure connection.