无码人妻丰满熟妇一区二区三区,中文字幕午夜精品久久久,古代吸奶水小说,关于命运电影,8x拨牐拨牐x8免费视频8,真人实拍女处被破流血视频,好妈妈在线观看完整版中文神马,免费言情小说全文阅读全文,火车上看着娇妻被别人玩

〖Material〗 non-standard gear used by the custom of
Non-standard gear, that is, non-standard gear. Toothed gear means meshing continuously transmitting motion and power mechanical elements on the rim. Gear is capable of intermeshing toothed mechanical parts, gears in the transmission of the application appeared very early.
     Manufacture of gears commonly used steel has quenched and tempered steel, hardened steel, carburizing steel, and nitriding steel. Slightly lower than the forged steel strength steel, commonly used in a larger size gear; the poor mechanical properties of gray cast iron, can be used for light load open gear drive; ductile iron may be partially replaced by steel gear; multi-purpose plastic gear in light load and low noise requirements of local, paired with good thermal conductivity is generally gear steel gear.
Coming forward gear heavy duty, high-speed, high precision and high efficiency, the direction of development, and strive to small size, light weight, long life, and economically viable.
For more advice: mining machinery gear, cranes special gear