Gear Classification and Application
Classification： Blog
Release time：2024-06-20
Generally speaking, there are many types of gear transmission, of which the arrangement of the shaft and the direction of the tooth line relative to the gear generatrix are common classification methods, of course, can also be classified by the classification method,
According to the arrangement of the shaft, it is divided into parallel shaft gear transmission, intersecting shaft gear transmission and staggered shaft gear transmission.
According to the tooth line relative to the gear generatrix gear generatrix direction is divided into straight teeth, helical teeth, herringbone teeth, curved teeth.
According to the working conditions of gear transmission, it is divided into closed transmission, open transmission and semi-open transmission.
According to the tooth profile curve is divided into involute teeth, cycloid teeth, arc teeth.
According to the tooth surface hardness is divided into soft tooth surface (≤ 350HB), hard tooth surface (>350HB)
When designing equipment, engineers often use the arrangement of shafts to classify gears, so that they can be classified and analyzed by applying the characteristics of gears that can transmit any direction (parallel, intersecting, staggered), and select the appropriate gear transmission type corresponding to different working conditions.
According to the arrangement of the gear shaft. It is generally divided into three types: parallel axis, intersecting axis and staggered axis.
Parallel shaft gears, including spur gears, helical gears, herringbone teeth, internal gears, rack and pinion, etc.
Intersecting shaft gears, straight bevel gears, helical bevel gears, curved bevel gears, etc.
Staggered shaft gears, helical gears with staggered shafts, worm gears, hypoid gears, etc.
parallel shaft gear
Spur gears, cylindrical gears whose tooth line and axis line are parallel. Because it is easy to process, it is widely used in power transmission.
Helical gears, cylindrical gears with helical lines. Because of its higher strength and smooth operation than spur gears, it is widely used. Axial thrust is generated during transmission.
Herringbone gear, tooth line for the left-hand and right-hand two helical gear combination of gears. This has the advantage of not generating thrust in the axial direction.
Internal gear, and spur gear meshing in the ring on the inner side of the gear teeth. Mainly used in planetary gear transmission mechanism and gear coupling and other applications.
The straight rack and the straight rack are linear rack-shaped gears that mesh with a spur gear. It can be regarded as a special case when the pitch diameter of the spur gear becomes infinite.
The helical rack and the helical rack are strip gears that mesh with the helical gears. This corresponds to the case when the pitch diameter of the helical gear becomes infinite.
intersecting shaft gear
Straight bevel gears, bevel gears whose tooth lines are consistent with the generatrix of the pitch cone line. Among bevel gears, it is of the type that is relatively easy to manufacture. Therefore, as a transmission with a wide range of bevel gears.
Helical bevel gears and pitch bevel tooth lines are tangent to a circle concentric with the pitch cone axis, also known as tangent bevel gears. It has the same advantages as straight bevel gears, and helical cylindrical gears have the same advantages as straight cylindrical gears. The impact load is smaller and the operation is more stable. However, due to the low productivity of this gear processing, performance is not as good as the use of specialized high-efficiency machine tools can be mass-produced spiral bevel gears, so gradually replaced by the latter, has been rarely used.
Curve tooth bevel gear, tooth line is curve, with spiral angle of bevel gear. Although compared with straight bevel gears, the production is more difficult, but as a high-strength, low-noise gear is also widely used.
staggered shaft gear
The name of the staggered shaft helical gear and cylindrical worm pair when driving between the staggered shafts. It can be used in the case of helical gear pairs or helical gear and spur gear pairs. Although the operation is smooth, it is only suitable for use under light load conditions.
Hypoid gears, conical gears that drive between staggered shafts. The large and small gears are processed eccentrically, which is similar to the arc gear, and the meshing principle is very complicated.
Worm gears and worm gears are divided into cylindrical worm pairs and drum worm pairs. Cylindrical worm pairs are the general term for cylindrical worms and worm gears that mesh with them. The quiet operation and the large transmission ratio that can be obtained in a single pair are its large characteristics, but the disadvantage of low efficiency. The general term for the drum-shaped worm and the worm gear that meshes with it. Although it is difficult to manufacture, it can transmit large loads compared with cylindrical worm pairs.
Other special gears
Face gears, disc-shaped gears that can mesh with spur gears or helical gears. Drive between orthogonal and staggered shafts.
keyword： Gear,Shaft