Variable velocity and torque enable non-circular gears to meet particular or irregular movement requirements similar to alternatingly rising and decreasing output velocity, multi-speed, and reversing motion. Furthermore, linear gears, such automotive gears as gear racks, can convert the rotational movement of the driving gear into translational movement of the driving gear. Spiral bevel mechanical gears have curved tooth lines, they usually have a greater tooth contact ratio than the straight bevel gear.
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