【机械工程】变速齿轮【运输】变速齿轮（可变齿轮 可变齿轮）行星齿轮 差动齿轮 带状驱动

fiexible drive change-speed gear

pedestal change-speed gear of the diving key type

main pulley for secondary change-speed

clutch-controlled pedestal change-speed gear, pedestal change-speed

adjusting devices for change-speed gears for cycles

adjustable speed motor【电】;change-speed motor【电】;variable motor【电】

change-speed gearing

pedestal change-speed gearing, gears continuously meshing