Zhongmeng Technology
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18
2019
-
02
Types and characteristics of gears
Author：
1. Types and characteristics of cylindrical gears
Straight cylindrical gears
1) The two axes of large and pinion are parallel to each other
2) When the external meshing transmission is made, the two gears rotate in opposite directions; When the internal meshing transmission is made, the two gears rotate in the same direction
3) The tooth shape can be made into normal teeth, short teeth, and can be displaced
4) The long direction line of the gear teeth is inclined to the gear axis at an angle
5) The meshing transmission is smoother than the straight tooth cylindrical gear transmission, and the transmitted force is larger
6) Make more straight cylindrical gears troublesome helical gears
Gears and racks
1) The gear meshing with the rack can be spur gear or helical gear, and has the characteristics of spur gear or helical gear
2) Rack and gear transmission is to change rotation into linear movement or movement into rotation
3) The rack is formed when the diameter of the gear is infinite
2. Types and characteristics of bevel gears
Straight bevel gear
1) The two axes of large and pinion intersect at the cone vertex
2) When the bevel angle of the large gear is equal to 90°, it becomes a planar gear; Above 90°, it becomes an internal bevel gear
Helical bevel gears
1) The tooth line is oblique, tangent to a certain circle, and the tooth line does not intersect with the cone top
2) The rotation angles of the big and pinions are equal and the direction is opposite
3) Stable transmission of straight bevel gear
Arc bevel gear
1) Stable transmission, large force transmission, suitable for off-speed transmission
2) The rotation angles of the big and pinions are equal and the direction is opposite
3) The axes of the two gears intersect at the vertices of the cone
4) Arc bevel gears are divided into circular arc teeth, extended cycloid teeth, and quasi-involute teeth
3. Types and characteristics of worms and worm gears
Archimedes worm
1) The tooth shape on the axial section of the worm is straight
2) Easy to manufacture
Linear worm
1) The tooth shape on the normal section of the worm moth spiral line is a straight line
2) It is the best one of the three types of ankles, the most common
Involute worm
The tooth shape on a plane parallel to the axis of the worm and tangent to the base cylinder is linear
Circular worm gear and worm gear
1) The efficiency is good, and the oil film is well formed
2) Large carrying capacity
3) Complex manufacturing and assembly
4) Also known as spherical worm gear pair
5) The tooth type is divided into: primitive type and modified plow. The purpose of the correction is to facilitate the formation of an oil film in the transmission of worm gears
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