Compared with the spur gear, helical gear works more smoothly and softly due to the way the teeth connect. The most widely used gear in transmissions is the Helical. They also produce a significant amount of thrust and help sustain the thrust load by using the bearing. There are two types of helical gear called helical gear parallel and helical gear crossed. So here this article gives the information about the difference between parallel helical gear and crossed helical gear to better understand this topic.
Difference between parallel helical gear and crossed helical gear:
- Parallel helical gear can transmit motion and power between parallel shafts only, while crossed helical gear can transmit motion and power between perpendicular but not intersecting shafts.
- In Parallel helical gear, two mating gears must be mounted on two parallel shafts, while the crossed helical gear two mating gears are mounted on two perpendicular but non-intersecting shafts.
- The power transmission capacity of parallel helical gear is higher due to broader contact, while the crossed helical gear has lower power transmission capacity due to point contact.
- Parallel helical gear has a wide area of application ranging from small equipment to large industrial fields including gear trains, while the crossed helical gear is rarely used in small size instruments.
- parallel helical gear has two mating gear that should have the same helix angle contact but gradually becomes a line contact, while the crossed helical gear two mating gears may have different helix angles. They may have either the same or opposite hand of the helix.
- parallel helical gear the engagement between two teeth starts with a point contact but gradually becomes a line contact, while the crossed helical gear two meshing teeth always have point contact.
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