With the development of science, gears have gradually changed from metal gears to plastic gears. Because plastic gears are more lubricating and wear-resistant. It can reduce noise, reduce costs, and reduce friction.
The commonly used plastic gear materials are: PVC, POM, PTFE, PA, nylon, PEEK, etc.
car gear
There are many steel grades for gears of medium and heavy-duty trucks in my country, mainly to meet the requirements of introducing advanced foreign automobile technology at that time. In the 1950s, my country introduced the production technology of Soviet medium-duty trucks (ie the original "Jiefang" brand) from the former Soviet Union Rikhachev Automobile Factory, and at the same time introduced the 20CrMnTi steel grade for automobile gears produced in the former Soviet Union.
After the reform and opening up, with the rapid development of my country’s economic construction, in order to meet the needs of the rapid development of my country’s transportation, starting from the 1980s, my country has introduced various advanced models from industrialized developed countries in a planned manner, as well as various advanced foreign medium- and heavy-duty trucks. Freight cars are also being introduced continuously. At the same time, my country's major automobile factories cooperate with well-known foreign automobile companies to introduce advanced foreign automobile production technology, including automobile gear production technology. At the same time, the level of steel smelting technology in my country is also constantly improving. The use of advanced smelting technologies such as ladle secondary smelting and composition fine-tuning and continuous casting and rolling has enabled steel mills to produce gears with high purity and narrow hardenability bands. The use of steel has realized the localization of imported automobile gear steel, which has brought my country's gear steel production level to a new level. The nickel-containing high-hardenability steel for domestic heavy-duty automobile gears suitable for my country's national conditions has also been applied and achieved good results. The heat treatment technology of automobile gears has also developed from the use of well-type gas carburizing protection in the 1950s and 1960s to the current universal use of computer-controlled continuous gas carburizing automatic lines, box-type multi-purpose furnaces and automatic production lines (including low-pressure (vacuum) carburizing). Technology), gear carburizing pre-oxidation treatment technology, gear quenching controlled cooling technology (due to the use of special quenching oil and quenching cooling technology), gear forging blank isothermal normalizing technology, etc. The adoption of these technologies not only enables effective control of gear carburizing and quenching distortion, improved gear processing accuracy and extended service life, but also satisfies the mass production needs of modern heat treatment of gears.