英语翻译A machine consists of a number of machine elements.The m

英语翻译
A machine consists of a number of machine elements.The most useful machine element in power transmission is the gear.The gear is virtually a wheel wist a number of teeth.Gears must work inpairs.A pair of gears with different number of teeth will increase or decrease the speed of rotation.
pulleys and belts are very common in power transmission.They can also change speeds on machine tools gears or pulleys rotate on shafts.The shaft must rest in bearings.somrtimes they may be couplings between shafts.we may use clutches to start or stop shalt motion.A machine consists of a number of machine elements.The most useful machine element in power transmission is the gear.The gear is virtually a wheel wist a number of teeth.Gears must work inpairs.A pair of gears with different number of teeth will increase or decrease the speed of rotation.
pulleys and belts are very common in power transmission.They can also change speeds on machine tools gears or pulleys rotate on shafts.The shaft must rest in bearings.somrtimes they may be couplings between shafts.we may use clutches to start or stop shalt motion.