Helical gear reducer can be realized by straight tooth, helical tooth and spiral spiral bevel gear. Generally, the shafts of a helical gear reducer intersect at 90 degrees, and in principle there are other intersecting angles. According to the installation situation of the bevel gear, the rotation direction of the input shaft and the output shaft can be the same or opposite.
The simplest type of helical gear reducer has straight or helical bevel gears. Such gears are relatively inexpensive to manufacture. The use of straight or helical bevel gears can only achieve small end-face meshing, so this type of helical gear reducer has a low running smoothness and can transmit less torque than other types of bevel gears. When the helical gear reducer is used in combination with the planetary reducer, usually, the gear ratio of the bevel gear grade is 1:1 in order to maximize the transmittable torque.

Using arc teeth, another helical gear reducer can be realized. Spiral bevel gears can be designed as spiral bevel gears or hypoid gears. The total contact ratio of spiral bevel gears is extremely high, but due to its special structure, the manufacturing cost is higher than that of straight or helical bevel gears. The advantage of the spiral bevel gear is that it can not only improve the running smoothness, but also increase the transmittable torque. Using this type of gear can also increase the speed.
Bevel gears generate high axial and radial loads during operation. Because the shafts intersect, they can only receive these loads on one side. If it is used as a fast-rotating drive stage in a multi-stage reducer, special attention must be paid to the service life of the bearing. In addition, unlike the turbine reducer, the helical gear reducer has no self-locking function.
In the area of ​​the angle reducer, the helical gear reducer can replace the hypoid gear reducer to reduce operating costs.

Advantages of helical gear reducer:
1. Use in limited structural space
2. Compact structure
3. Can be used in combination with other types of reducers
4. When using spiral bevel gears, the speed is high
5. It can replace hypoid gear reducer and reduce cost
Disadvantages of helical gear reducer:
1. Complex structure
2. The efficiency is lower than the planetary reducer
3. Poor running smoothness
4. In the single-stage transmission ratio range, the torque is lower

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