摘要：【中文】本发明涉及一种链条张紧器，其具有主体、柱塞和销，所述销具有用于操作所述销的操作部、用于防止所述柱塞从所述主体脱出的杆部和用于将所述销相对于所述主体和/或所述柱塞定位的定位部，所述主体具有插入孔，所述销的所述杆部插入所述插入孔中从而防止所述柱塞从所述主体脱出，所述主体和/或所述柱塞具有定位结构，所述定位部与所述定位结构接合，从而防止所述销相对于所述主体和/或所述柱塞转动。 【EN】The present invention relates to a chain tensioner having a main body, a plunger, and a pin, the pin having an operating portion for operating the pin, a shank portion for preventing the plunger from coming out of the main body, and a positioning portion for positioning the pin relative to the main body and/or the plunger, the main body having an insertion hole into which the shank portion of the pin is inserted so as to prevent the plunger from coming out of the main body, the main body and/or the plunger having a positioning structure with which the positioning portion is engaged so as to prevent the pin from rotating relative to the main body and/or the plunger.