What is a worm gear used for?
Worm Gears – Applications & Uses. A worm gear (or worm drive) is a specific gear composition in which a screw (worm) meshes with a gear/wheel similar to a spur gear. The set-up allows the user to determine rotational speed and also allows for higher torque to be transmitted.
Most people think that straight cut (actually called spur) gears are stronger than helical gears and that's why their used. The reason for this is quite simple: helical gears have more teeth meshing and thus have a greater load bearing surface area.
- Disadvantages of Spur Gear:
- Spur gear drives are costly when compared to belt drives.
- They have a limited center distance.
- Spur gears produce a lot of noise when operating at high speeds.
- They cannot be used for long distance power transmission.
- Gear teeth experience a large amount of stress.
- A straight-cut transmission is inherently more efficient than a helical gearing system. The axial load produced by helical gears only detracts from the output energy from the transmission along with an increase in friction and therefore losses of energy due to heat occur.
- Spur gears are the most common type of gears. They have straight teeth, and are mounted on parallel shafts. Sometimes, many spur gears are used at once to create very large gear reductions.
Helical is the most commonly used gear in transmissions. They also generate large amounts of thrust and use bearings to help support the thrust load. Helical gears can be used to adjust the rotation angle by 90 deg. when mounted on perpendicular shafts.
- A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm gear (which is similar in appearance to a spur gear). Like other gear arrangements, a worm drive can reduce rotational speed or transmit higher torque.
- The gear ratio is the ratio of the number of turns the output shaft makes when the input shaft turns once. A gearset with a 1-inch drive gear and a 2-inch driven gear has a gear ratio of 2:1. Through selection of the proper gear ratio, torque applied to the drive wheels can be multiplied.
- Helical is the most commonly used gear in transmissions. They also generate large amounts of thrust and use bearings to help support the thrust load. Helical gears can be used to adjust the rotation angle by 90 deg. when mounted on perpendicular shafts.
Gears are used for several reasons. They serve to keep the turning or rotation of two axes together. Gears can increase or decrease the speed of rotation and can easily be used to reverse the direction of rotation. Another reason gears are essential is that they transmit rotational motion to a different axis.
- Gears are used for transmitting power from one part of a machine to another. Similarly, in a car, gears transmit power from the crankshaft (the rotating axle that takes power from the engine) to the driveshaft running under the car that ultimately powers the wheels.
- Many are machines we use in our everyday life, such as cars; wind up toys, clocks, mixers, bikes, oil rigs, vacuum etc. Gears make our lives easier in many ways. They allow us to change direction and speed of movement, measure time and create a great force “mechanical output” with a little force input.
- Spur Gears are usually used for "slow speeds." Examples are winches, wind-up clocks, and washing machines. Bevel Gears are used for objects that reach higher speeds, such as certain automobiles and hand drills. Worm Gears are often used in conveyor systems to lock the gears.
Updated: 1st October 2018