【机械工程】变速圆柱传动装置，行星齿轮

speed-changing gearing, reversing gear

belt speed-changing gearing with cone pulleys

speed-changing bevel gearing planetary gearing

belt speed-changing gearing

speed-changing gear boxes

speed-changing gearing

speed-changing arrangement

speed-changing gearing engaging stepped pulleys for V-belts, belts, ropes