[机] belt tightener

... 皮带增速装置 belt speed-increasing device 皮带张紧器 belt tightener 皮带直角转弯传动 quarter-turn drive ...

 belt stretcher

... belt speeder 皮带变速装置 belt stretcher 皮带张紧器 belt tightener 紧带器 ...

 fan belt tensioner

皮带张紧器 belt tightener ; belt stretcher ; fan belt tensioner 带张紧器 belt tensioner ; belt tightener ..