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There are many types of gears, and their classification method is usually based on the gear axis. It is generally divided into three types: parallel axis, intersecting axis, and staggered axis.

1) Parallel axis gears: including spur gears, helical gears, internal gears, racks, and helical gears.

2) Intersecting shaft gears: including spur bevel gears, bevel bevel gears, zero degree bevel gears, etc.

3) Interlocking shaft gears: There are interlocking shaft helical gears, worm gears, hyperbolic gears, etc.

Thoroughly explain gear knowledge from shallow to deep, recommended for collection!

The efficiency listed in the table above is the transmission efficiency, excluding losses such as bearings and mixing lubrication. The meshing of gear pairs with parallel and intersecting axes is basically rolling, and the relative sliding is very small, so the efficiency is high. Interlocking shaft gear pairs such as helical gears and worm gears generate rotation through relative sliding to achieve power transmission, so the influence of friction is very significant, resulting in a decrease in transmission efficiency compared to other gears. The efficiency of gears refers to the transmission efficiency of gears under normal assembly conditions. If the installation is incorrect, especially when the assembly distance of the bevel gear is incorrect, resulting in errors in the same cone intersection point, its efficiency will significantly decrease.

3.1 Parallel axis gears

1) Spur gear

A cylindrical gear with parallel tooth lines and axis lines. Due to its ease of processing, it is most widely used in power transmission.

2) Rack and pinion

A linear toothed strip gear that meshes with a spur gear. It can be seen as a special case where the pitch diameter of a spur gear becomes infinitely large.

3) Internal gear

A gear with teeth machined on the inner side of a circular ring that meshes with a spur gear. Mainly used in applications such as planetary gear transmission mechanisms and gear couplings.

4) Helical gear

A cylindrical gear with a helical tooth profile. Because it has higher strength and smoother operation than spur gears, it is widely used. Axial thrust is generated during transmission.

5) Helical gear rack,

A strip gear that meshes with helical gears. Equivalent to the situation where the pitch diameter of a helical gear becomes infinitely large.

6) Herringbone gear

A gear composed of two helical gears with left and right teeth. There is an advantage of not generating thrust in the axial direction.

3.2 Intersecting axis gears

1) Spur bevel gear

A bevel gear with a tooth line that matches the generatrix of the pitch cone line. In bevel gears, they belong to the relatively easy to manufacture type. So, as a transmission bevel gear, it has a wide range of applications.

2) Spiral bevel gear

A bevel gear with a helical angle and a curved tooth profile. Although it is more difficult to produce compared to spur bevel gears, it is also widely used as a high-strength, low-noise gear.

3) Zero degree bevel gear

A curved bevel gear with a helix angle of zero degrees. Because it has the characteristics of both straight and curved bevel gears, the force situation on the tooth surface is the same as that of straight bevel gears.

3.3 Interlocking shaft gears

1) Cylindrical worm gear pair

Cylindrical worm gear pair is the general term for cylindrical worm gear and the worm wheel that meshes with it. Its biggest feature is its calm operation and the ability to achieve a large transmission ratio with a single pair, but it has the disadvantage of low efficiency.

2) Interlocking shaft helical gear

The name of cylindrical worm gear pair in the transmission between staggered shafts. Can be used in the case of helical gear pairs or helical gear and spur gear pairs. Although it runs smoothly, it is only suitable for use under light loads.

3.4 Other special gears

1) Face gear

A disc-shaped gear that can mesh with spur or helical gears. Drive between orthogonal and staggered axes.

2) Drum shaped worm gear pair

The general term for drum shaped worm gears and worm gears that mesh with them. Although it is difficult to manufacture, it can transmit large loads compared to cylindrical worm gear pairs.

3) Hypoid gear

A conical gear that drives between intersecting shafts. The large and small gears undergo eccentric machining, similar to bevel gears, and the meshing principle is very complex.