RACK AND PINION [1st fig.]
A rack and pinion is a pair of gears which convert rotational motion into linear motion. The circular pinion engages teeth on a flat bar - the rack. Rotational motion applied to the pinion will cause the rack to move to the side, up to the limit of its travel.
BEVEL GEARS [2 nd fig.]
Bevel gears can be used to change the direction of drive in a gear system by 90 degrees. A good example is seen as the main mechanism for a hand drill. As the handle of the drill is turned in a vertical direction, the bevel gears change the rotation of the chuck to a horizontal rotation.
SPUR GEARS [ 3 rd fig.]
Spur gears are wheels with teeth that mesh together. Spur gears are used to change the speed and force of a rotating axle.
WORM GEAR [ 4th fig. ]
A worm gear, or worm wheel, is a type of gear that engages with a worm to greatly reduce rotational speed, or to allow higher torque to be transmitted. The image shows a section of a gear box with a bronze worm gear being driven by a worm. A worm gear is an example of a screw.
Posts
