Engrenage en plastique
Avec le développement de la science, les engrenages sont lentement passés des engrenages en métal aux engrenages en plastique. Parce que les engrenages en plastique sont plus lubrifiants et-résistants à l'usure. Peut réduire le bruit, réduire les coûts et réduire la friction.
Les matériaux d'engrenages en plastique couramment utilisés sont : PVC, POM, PTFE, PA, nylon, PEEK, etc.
Équipement de voiture
There are many steel grades for gears of medium and heavy 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 Plant, and at the same time introduced the 20CrMnTi steel grade of automobile gears produced in the former Soviet Union.
Engrenage en forme
Former des engrenages (10 photos)
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, from the 1980s onwards, my country has introduced various advanced models from industrially 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 famous foreign automobile companies to introduce advanced foreign automobile production technology, including automobile gear production technology. At the same time, the level of my country's steel smelting technology is constantly improving. The use of advanced smelting technologies such as ladle secondary smelting and composition fine-tuning, continuous casting and rolling, enables steel mills to produce gears with high purity and narrowed 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 original 50-60s to the current universal use of continuous gas carburizing automatic lines and box-type multi-purpose furnaces and automatic production lines (including low-pressure (vacuum) carburizing) controlled by computers. 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.
La littérature pertinente souligne que la durée de vie des engrenages automobiles est principalement évaluée par deux indicateurs majeurs, l'un est la résistance à la fatigue de contact de l'engrenage et l'autre est la résistance à la fatigue en flexion de l'engrenage. Le premier est principalement déterminé par la qualité de la cémentation et de la trempe, et le second est principalement déterminé par le matériau de l'engrenage. Pour cette raison, il est nécessaire d'avoir une compréhension plus complète des exigences, des performances et des caractéristiques de traitement thermique de l'acier cémenté pour les engrenages automobiles.
