In order to provide with the functions of absorbing vibration and safety over loading, a new structure of elastic sleeve pin coupling with safety pin has been designed.

为了使弹性套柱销联轴器既保留缓冲减振功能，又具有安全保护的作用，设计了带安全销的弹性套柱销。

youdao

The brake moment is overcome by the resilient pin, and the shear force is not applied to the coupling bolt, which enhances the reliability of the coupling bolt.

制动力矩由定位销克服，联结螺栓不受剪切力作用，加强了联结螺栓的可靠性；

youdao

Trailers are typically attached to tractors by a "fifth wheel, " in which a coupling pin on the trailer fits into the center of a large horseshoe-shaped piece of metal.

NPR: Runaway Trailer Crashes Rare; NY Accident Killed 7