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2. Bevel gear - Wikipedia

   en.wikipedia.org/wiki/Bevel_gear

   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 ...

3. Spiral bevel gear - Wikipedia

   en.wikipedia.org/wiki/Spiral_bevel_gear

   Spiral bevel gear. 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 ...

4. List of gear nomenclature - Wikipedia

   en.wikipedia.org/wiki/List_of_gear_nomenclature

   A shaft angle is the angle between the axes of two non-parallel gear shafts. In a pair of crossed helical gears , the shaft angle lies between the oppositely rotating portions of two shafts. This applies also in the case of worm gearing .

5. Transmission (mechanical device) - Wikipedia

   en.wikipedia.org/wiki/Transmission_(mechanical...

   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 ...

6. Azimuth thruster - Wikipedia

   en.wikipedia.org/wiki/Azimuth_thruster

   Mechanical transmission, which connects a motor inside the ship to the outboard unit by gearing. The motor may be diesel or diesel-electric. Depending on the shaft arrangement, mechanical azimuth thrusters are divided into L-drive and Z-drive. An L-drive thruster has a vertical input shaft and a horizontal output shaft with one right-angle gear.

7. Differential (mechanical device) - Wikipedia

   en.wikipedia.org/wiki/Differential_(mechanical...

   The left sun gear (red) provides more resistance than the right sun gear (yellow), which causes the planet gear (green) to rotate anti-clockwise. This produces slower rotation in the left sun gear and faster rotation in the right sun gear, resulting in the car's right wheel turning faster (and thus travelling farther) than the left wheel.