拖车驱动装置传动齿轮箱
trailer drive transfer gearbox
小齿轮传动装置弹簧
pinion drive spring
pinion drive assembly spring
齿轮-齿条传动
gear-rack transmission
Rack and gear transmission
齿轮传动装置
cogwheel gearing
gearing
gear drive unit
gear assembly
gear transmission unit
gear system
propulsion gearing systems
gear drive device
Gear