According to the gear to drive the constraints of the prerequisites
During the transmission process, the tooth surface wear gear is not only affected by the load, but also the two tooth surfaces of the contact will have a certain relative sliding, that is, the sliding friction is generated, so that the tooth surface is worn. In the open type drive, since flying dust, debris, and the like easily enter the working tooth surface, the wear will be more rapid and serious. After the tooth surface is worn, the tooth thickness is thinned, and the involute tooth profile is broken, causing shock and noise to the transmission. In closed gear transmission, if the lubricating oil is not clean, it will also cause severe wear.
The solutions are as follows: (1) Improve the working environment of the gear, generally adopt closed gear transmission; (2) Improve the hardness of the tooth surface and reduce the roughness of the tooth surface to improve the wear resistance of the tooth surface; (3) Supply sufficient lubrication The oil keeps the lubricating oil clean and improves the lubrication conditions.
The influence of gear profile curve and optimization design The involute profile gear drive has been applied for more than 200 years, and it has its advantages, but it also has some shortcomings: the load is unevenly distributed along the tooth width, the meshing loss is large, and the transmission efficiency is reduced. Wait. These defects affect the further improvement of the quality of the gear. Advances in modern manufacturing technology have developed arc gears that make up for the inadequacy of gear teeth.
The end face or the normal tooth profile of the circular arc gear is an arc, one is a convex arc and the other is a concave arc. In order to ensure the continuity of the gear transmission, such gears can only be designed as helical gears. Its characteristics: large comprehensive radius of curvature, high contact strength of the teeth; in the case of the same material and size of the teeth, the contact strength is increased by two times; sensitivity to manufacturing errors and deformation is small; no root cutting problem, There is no minimum number of teeth to be limited by the undercut, so the radial size can be greatly reduced. On this basis, if a pair of arc gears are driven, the tooth tips that are meshed with each other are convex arcs, and the roots are concave arcs. Each pair of teeth has two meshing points when engaged, one tooth root and one tooth root. This not only improves the gear strength and the smoothness of the transmission movement, but also reduces vibration and noise. The advantages of the arc gear are greatly improved.
Reasonable application of gear materials In recent years, plastic gears and high-strength ductile iron gears have become more and more widely used in mechanical equipment with low load. Plastic gears have the advantages of light weight, low noise, low cost, suitable for injection molding and no lubrication. Used in home appliances, office machinery, light industry food machinery, robots and other products. Nowadays, the research on plastic gears (nylon alloy gears and composite gears) of new materials has made many achievements in the aspects of tooth surface temperature, friction coefficient variation and temperature rise on mechanical properties, so that plastic gears are gradually applied. Power machinery.
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