A crown gear has teeth that engage with other bevel gears. The teeth stick out at right angles to the face of the wheel. A worm gear is a screw that attaches to a wheel by engaging teeth along the wheel. As the screw turns, the wheel also moves and the drive reduces rotational speed and allows for higher torque. Worm gears are used when a project requires large gear reductions.
A bevel gear is cone shaped with the gear teeth placed vertically along the periphery. A worm gear is barrel shaped with the teeth spiraling along the length like a screw.
A worm drive.
Even slower
the crown gear is the largest gear in th differential on your vehicle to the sides of the crown gear are the planetary gears
A worm or machine can be geared with worm gear to give it higher torque or to reduce rotational speed in the machine.
linear distance moved by the gear(worm,screw jack) for one rotation of the gear(worm,screw jack)
yes you can reverse worm and gear. A worm gear can rotate the worm, its based on the lead angle, pressure angle and co.efficient of friction between the pairs.
Worm gear
function , purpose , advantage and disadvantage of worm gear
In worm gears, an axle or shafts has a screw that connects with another gear. This system is used when you need to change the direction of motion and reduce speed
Sand mullers break up sand after it has been used in molds to facilitate sandcasting. By effectively breaking up the sand, it can be reused. The worm on a motor or on the "driven" side of the device will engage with a worm gear. The worm rotates continuously, and the spiral cut gears "worm" their way "along" the axis of the gear. The worm gear (or spur gear) engages with the worm and rotates continuously as well. Also, the worm gear will translate the rotary motion of the worm by 90 degrees. It is fairly easy to see how the unit works if you look at some pictures or drawings. Hey, how about some animation or video? Got a couple of links.
Spur gears give 180 degree drive, and worm gears give 90 degree drive.