Gears are generally divided into three categories

There are many kinds of gears, and the most common classification method is according to the gear shaft. Generally divided into three types: parallel axis, intersecting axis and staggered axis.

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

2) Intersecting shaft gears: there are straight bevel gears, spiral bevel gears, zero-degree bevel gears, etc.

3) Staggered shaft gears: there are staggered shaft helical gears, worm gears, hypoid gears, etc.

The efficiency listed in the table above is the transmission efficiency, excluding the loss of bearing and stirring lubrication. The meshing of the gear pairs of the parallel shaft and the intersecting shaft is basically rolling, and the relative sliding is very small, so the efficiency is high. Staggered shaft helical gears, worm gears and other staggered shaft gear pairs, because the relative sliding generates rotation to achieve power transmission, so the impact of friction is very large, and the transmission efficiency is reduced compared with other gears. The efficiency of a gear is the transmission efficiency of the gear under normal assembly conditions. If there is an incorrect installation, especially if the bevel gear is not assembled at the correct distance, resulting in an error in the intersection of the same cone, its efficiency will drop significantly.

Methods of Measuring and Evaluating Gear Accuracy

The accuracy of gears can be roughly divided into three categories:
a) Correctness of involute tooth profile – tooth profile accuracy
b) The correctness of the tooth line on the tooth surface – the tooth line accuracy
c) Correctness of tooth/gap position
• Tooth indexing accuracy—single pitch accuracy
• Pitch Correctness – Cumulative Pitch Accuracy
• Deviation of the radial position of the ball clamped between the two gears – radial runout accuracy

Scan the gear under test, and build the actual model of the gear under test through the scanned data; overlap the actual model of the gear under test with the standard 3D model; compare the selected sections of the overlapping models; judge whether the points on the actual model section are not Outside the tolerance zone selected on the actual model. The method makes the measurement data of the gears intuitive and easy to understand, and does not require too professional technical background; it can eliminate the need for professional gear measurement equipment and reduce the investment of professional instruments; the data information is comprehensive, and the data characteristics of the tooth surface can be fully controlled, and the The measured data can be directly read into the design or analysis software for use; high efficiency can be used for online measurement of mass-produced gear parts, making product quality easy to manage; it can be applied to the systematic management, tracking and complex data of gear products. Data analysis applications.