3. Gears are generally divided into three categories
There are many kinds of gears, and their classification is most commonly based on gear axicity.Generally divided into three types of parallel axis, intersection axis and staggered axis.
1) parallel shaft gear: including spur gear, helical gear, inner gear, rack and rack, etc.
2) intersecting shaft gear: straight tooth bevel gear, arc tooth bevel gear, zero tooth bevel gear, etc.
3) staggered shaft gear: there are staggered shaft helical gear, worm gear, hypoid gear, etc.
The efficiency listed in the above table is the transmission efficiency, excluding the loss of bearing and stirring lubrication.The meshing of gear pairs of parallel and intersecting axes is basically rolling, and the relative sliding is very small, so the efficiency is high.Staggered shaft helical gear and worm and worm gear and other staggered shaft gear pairs, because it is through the relative sliding to produce rotation to achieve power transmission, so the impact of friction is very large, compared with other gear transmission efficiency.The efficiency of gears is the transmission efficiency of gears under normal assembly conditions.If the installation is not correct, especially when the bevel gear is assembled at the wrong distance, which leads to the error of the intersection point with the cone, the efficiency will decrease significantly.