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A transmission (also called a gearbox) is a mechanical device which uses a gear set—two or more gears working together—to change the speed, direction of rotation, or torque multiplication/reduction in a machine. [1] [2] Transmissions can have a single fixed-gear ratio, multiple distinct gear ratios, or continuously variable ratios. Variable ...
The pitch surface of an ordinary gear is the shape of a cylinder. The pitch angle of a gear is the angle between the face of the pitch surface and the axis. The most familiar kinds of bevel gears have pitch angles of less than 90 degrees and therefore are cone-shaped. This type of bevel gear is called external because the gear teeth point ...
The spiral angle of the pinion is larger than the spiral angle of the gear in a hypoid gearbox, so the pinion diameter can be larger than that of a bevel gear pinion. This helps in attaining an enhanced contact surface and a better tooth strength which allows for higher gear ratios and scope of higher torque transmission. [ 4 ]
Addendum angle in a bevel gear, is the angle between face cone and pitch cone. [1] ... In the usual case with axes at right angles, it contains the worm axis. [1]
A Z-drive thruster has a horizontal input shaft, a vertical shaft in the rotating column and a horizontal output shaft, with two right-angle gears. Electrical transmission , more commonly called pods, where an electric motor is fitted in the pod itself, connected directly to the propeller without gears.
In hypoid gear design, the pinion and gear are practically always of opposite hand, and the spiral angle of the pinion is usually larger than that of the gear. The hypoid pinion is then larger in diameter than an equivalent bevel pinion. A hypoid gear incorporates some sliding and can be considered halfway between a straight-cut gear and a worm ...
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