Spur gear
Spur gears have their teeth parallel to the axis and are used for transmitting power between two parallel shafts. Spur gears have highest efficiency and excellent precision rating.
Rack and pinion
Rack is a segment of a gear of infinite diameter. The tooth can be spur or helical. This type of gearing is used for converting rotary motion into translatory motion or visa versa.
helical gear
Helical gears are used for parallel shaft drives. They have teeth inclined to the axis. Hence for the same width, their teeth are longer than spur gears as their teeth are inclined and have higher load carrying capacity. Their efficiency is slightly lower than spur gears.
Internal gear
Internal gears are used for transmitting power between two parallel shafts.
In these type of gears, annular wheels are having teeth on the inner periphery. In these type of drives, the meshing pinion and annular gear are running in the same direction.
In these type of gears, annular wheels are having teeth on the inner periphery. In these type of drives, the meshing pinion and annular gear are running in the same direction.
Double helical gear
Double helical gears used for transmitting power between two parallel shafts. They have opposing helical teeth with or without a gap depending on the manufacturing method adopted for gear manufacturing. Two axial thrusts oppose each other and nullify. Hence the shaft is free from any axial force.
worm gear
Worm and worm gear pair consists of a worm, which is very similar to a screw and a worm gear, which is a helical gear. They are used in right-angle skew shafts. In these gears, the engagement occurs without any shock. High reduction ratios 8 to 400 are possible. Efficiency of these gears is low anywhere from 40% to 90%.
Spiral gear
Spiral gears are also known as crossed helical gears. They have high helix angle and transmit power between two non-intersecting non-parallel shafts. They have initially point contact under the conditions of sliding velocities finally gears will have line contact.
Straight bevel gear
Straight bevel gears are used for transmitting power between intersecting shafts. They can operate under high loads and high speeds. This type of gearing is used for right angle drive of particularly low ratios.
Spiral bevel gear
Spiral bevel gears are also used for transmitting power between intersecting shafts. Because of the spiral tooth in spiral bevel gear, the contact length is more and contact ratio is more. They operate have higher load capacity and smoother than straight bevel gears.
Hypoid bevel gear
Hypoid bevel gears are also used for right angle drive in which the axes do not intersect. The non intersection introduces a considerable amount of sliding and the drive requires good lubrication to reduce the friction and wear.