Spiral bevel gear
（重定向自Spiral angle）
![](/Images/godic/202502/12/Gear-kegelzahnrad.svg2509.png")
![Spiral bevel handedness](/Images/godic/202502/12/Spiral_hand2509.jpg")
![Zerol handedness](/Images/godic/202502/12/Zerol_hand2509.jpg")
![Hypoid spiral bevel gears](/Images/godic/202502/12/Sprocket35b2509.jpg")
A spiral bevel gear is a bevel gear with helical teeth. The main application of this is in a vehicle differential, where the direction of drive from the drive shaft must be turned 90 degrees to drive the wheels. The helical design produces less vibration and noise than conventional straight-cut or spur-cut gear with straight teeth.