I. Basic Structure of Bevel Gear
Bevel gear is a rotary mechanism used to transmit power and torque, usually composed of a pair of bevel gears. The bevel gear in the main gearbox consists of two parts: the large bevel gear and the small bevel gear, which are located on the input shaft and output shaft respectively. Two bevel gear teeth intersect into a tangent line, and a conical distribution.
II. The bevel gear why the spiral design
Bevel gears in the main gearbox more spiral gear design. This is because:
1. Improve transmission efficiency
Spiral gears can be divided into a number of small surfaces, so that each small surface interaction load is smaller, thereby reducing the contact stress and friction loss. The traditional straight bevel gears are prone to overloading because the intersecting lines of their helical tooth faces are straight rather than curved, so the contact area is smaller.
2. Reduce noise
Spiral gears of each gear tooth at the apex of the work are curved surfaces, so in the contact area of the meshing point, the gear teeth clearly in and out, the slower this transition, the easier it is to make the equipment in the work process noise is smaller.

3. Improve the bearing capacity
The tooth surface of the spiral bevel gear is spiral and has a large number of teeth. It has strong load distribution ability, can easily disperse the load and is smoother. Therefore, it has better load-bearing capacity and can ensure the stable operation of the main reducer.
III. The precautions
In the design and use of the main reducer, you also need to pay attention to the following points:
1. The design parameters should be a reasonable choice, especially the gear modulus and pressure angle and other parameters should be reasonably selected, in order to play the advantages of bevel gear.

2. Carry out regular inspection and maintenance, timely detection of problems and processing.
3. In the process of use, should pay attention to the machine acceleration and deceleration to the main reducer to bring impact, so as not to cause damage to it.
Conclusion
Bevel gears in the main reducer are mostly designed with spiral bevel gears, which is to improve transmission efficiency, reduce noise and improve the bearing capacity. In the process of use, attention should be paid to the selection of design parameters, regular inspection and maintenance, as well as to reduce the impact of the damage to the equipment.