Spiral Bevel Gear & Hypoid Gears

A Spiral Bevel gear has a 10:1 ratio range. Like the straight bevel gear, a spiral bevel gear is approximately 96% efficient per stage whereas hypoid gear is a type of spiral bevel gearbox, with the difference being that hypoid gears axes are in parallel planes but do not intersect.

A spiral bevel gear is a type of bevel gear, which is a gear with tapered and conical tooth surfaces. In the case of a spiral bevel gear, the tooth surfaces are not straight but are instead curved in a spiral manner. This spiral design allows for a gradual engagement of the gear teeth, resulting in smoother and quieter operation compared to straight-tooth bevel gears.

Types of Spiral bevel Gear:

In a Straight-cut spiral bevel gear, the tooth surfaces are straight and spiral around the gear axis.

The teeth of Curved-cut spiral bevel gears have a more complex shape, with a curvature that enhances tooth contact and load distribution.

Zero bevel gears have a spiral tooth form, but the spiral angle decreases to zero at the gear's center.

Hypoid bevel gears have a hypoid offset, meaning that the pinion's axis is positioned below the plane of the gear.

Helical spiral bevel gears combine the characteristics of helical gears and spiral bevel gears.

Rapid reverse spiral bevel gears are designed for quick and smooth reversal of direction in applications where rapid and precise changes in motion are required.

Applications of Spiral bevel Gear:

• Spiral bevel gears are used in Aerospace systems, such as helicopter transmissions and aircraft landing gear mechanisms.
• Spiral bevel gears are extensively used in Automotive differentials to transfer torque between the drive shaft and the wheels.
• Marine propulsion systems often utilize spiral bevel gears for transferring power from the engine to the propeller shaft.
• In Industrial machinery, spiral bevel gears find applications in gearboxes for conveyors, mixers, and various processing equipment.
• Spiral bevel gears are employed in the mechanical drive systems of Wind turbines, helping convert the rotational motion of the blades into electrical power.
• Medical imaging devices, surgical robots and rehabilitation equipment often incorporate spiral bevel gears for precise and smooth movement in various medical applications.
• In Robotics, spiral bevel gears are used in joint mechanisms to provide precise and controlled motion, contributing to the overall functionality and efficiency of robotic systems.