啊啊啊啊嗯视频日韩中文字幕99|在线观看国产大yy男人天堂av|亚洲天堂 主播AV无码国产精品|九九九影视91亚洲精品9999|日韩 欧美 精品欧美三级日本三级|日逼视频网站图片区日韩国产|亚洲第十页福利乱子伦一区二区|丁香激情六月av热热热热

Worm gear and worm gear mechanisms are commonly used to transmit motion and power between two staggered shafts. The worm gear and worm gear are equivalent to gears and racks in their middle plane, and the worm gear is similar in shape to a screw. The gear reduction ratio of the worm gear is generally 20:1, sometimes even up to 300:1 or greater.

Compared to copper worm gears, copper clad iron worm gears have better resistance and can also save material costs. The raw material ratio needs to be determined according to different needs.