Spiral bevel gears are commonly used in accessory gearbox design for several reasons:

1. Efficiency in Power Transmission:

Spiral bevel gears offer high efficiency in power transmission. Their tooth configuration allows for smooth and gradual contact between teeth, minimizing friction and energy loss. This is crucial for the efficient transfer of power in accessory gearboxes.
2. Compact Design:

Spiral bevel gears can be designed with a compact structure, making them suitable for applications where space is limited, as is often the case in accessory gearboxes.
3. High Torque Transmission:

The spiral tooth configuration enables these gears to handle high torque loads. This is important in accessory gearboxes where different components may require varying levels of torque for proper operation.
4. Reduced Noise and Vibration:

Compared to straight bevel gears, spiral bevel gears produce less noise and vibration during operation. This is beneficial for maintaining overall system stability and reducing wear on gearbox components.
5. Versatility in Shaft Arrangement:

Spiral bevel gears allow for flexible shaft arrangements, making them suitable for various gearbox configurations. This versatility is advantageous when designing accessory gearboxes for different applications.
6. Smooth Operation at High Speeds:

Spiral bevel gears are known for their smooth operation, even at high rotational speeds. In accessory gearboxes, where components may rotate at different speeds, this characteristic contributes to the overall reliability and performance of the system.
7. Enhanced Gear Tooth Strength:

The spiral shape of the gear teeth contributes to increased tooth strength, allowing the gears to withstand higher loads. This is essential in accessory gearboxes that may experience varying operating conditions.

In summary, the use of spiral bevel gears in accessory gearbox design is driven by their efficiency, compact design, torque-handling capabilities, reduced noise and vibration, versatility in shaft arrangements, smooth operation at high speeds, and enhanced tooth strength, all of which collectively contribute to the reliable and optimal performance of the gearbox.