What type of gear is primarily used for high-speed operation?

Helical gears are primarily used for high-speed operations due to their design, which allows for smoother and quieter engagement between the teeth compared to other types of gears. The teeth of helical gears are angled, which means that as the gears engage, the contact between the teeth is gradual rather than instantaneous. This results in a more gradual transfer of power and less vibration, making them ideal for high-speed applications where sound and wear need to be minimized.

Additionally, the angled teeth of helical gears help distribute the load more evenly across multiple teeth in contact, enhancing their ability to handle higher loads at high speeds. This characteristic, combined with their efficiency and reduced noise, makes helical gears favorable over spur gears, gear systems that perform well at lower speeds, and other types of gears like bevel or worm, which are not optimized for high-speed scenarios.