输送机链传动链轮
conveyor chain drive sprocket
闭式差动传动机构
closed pattern of transmission mechanism
步进链传动
intermittent roller chain drive
差动传动
differential transmission
差动传动比
differential driven ratio
差动传动式转速表
differential drive tachometer
齿轮-齿条传动
gear-rack transmission
Rack and gear transmission