What term refers to the arc of action to circular pitch or the length of action to base pitch?

The concept referred to as the contact ratio is crucial in gear design and analysis. It describes the extent to which two gears are in contact with each other during the meshing process. Specifically, the contact ratio is defined as the ratio of the arc of action to the circular pitch or the length of action to the base pitch.

This term is significant because it provides insight into the performance of gears. A higher contact ratio typically results in smoother operation, reduced noise, and lower stress on the gears, which can lead to greater durability and efficiency in the transmission of power. Understanding the contact ratio helps designers balance load distribution and ensure proper operation under various conditions.

In comparison to the other terms, the approach ratio refers more to the initial engagement of teeth prior to full contact, while the arc of action and arc of approach describe specific geometrical elements related to gear tooth engagement but do not capture the overall efficiency and effectiveness of the interaction as the contact ratio does.