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变速装置是介于原动机和从动机之间的装置,用于传递动力和改变转速。变速装置中,将原动机的转速增加和减少二者是不一样的。就是说,用大齿轮作为驱动齿轮的称为齿轮增速器,用小齿轮作为驱动齿轮的称为齿轮减速器。这些变速装置根据使用齿轮种类不同称呼也不一样,用直齿和斜齿轮的一般称为园柱齿轮变速器。近来,随着通用机械和船舶等的大型化和高速化,驱动的齿轮变速装置显著大型化,这些变速器中,有的输出轴转速低,传动马力大,有的高转速大功率。
Transmission is a device between the prime mover and the slave, used to transmit power and change speed. In the transmission, the speed of the prime mover increases and decreases, not the same. That is to say, with the gear as the drive gear called the gearbox, with pinion as the drive gear called gear reducer. These transmission devices according to the use of different types of gear called not the same, with spur and helical gears generally known as cylindrical gear transmission. Recently, as general-purpose machines, ships and the like have been increased in size and speed, driven gear transmissions have been significantly enlarged. Some of these transmissions have low output speeds, large transmission horsepower, and high speed and high power.