?背齿轮

... quill gear 背齿轮 quill shaft 中空轴, 套筒轴,(... metacarpal quill 掌羽 ...

?套管齿轮

... quill drive ==> 套管传动,空心轴传动,空心轴弹性传动 quill gear ==> 套管齿轮,背齿轮 quill roller ==> (轴承的)滚针 ...

[机]?套轴齿轮

... quill feed unit head 滑套进给式动力头 quill gear 套轴齿轮 quill roller 滚针 ...