指关节

"A knuckle joint is a mechanical joint used to connect two rods under tensile or compressive loads. It consists of a knuckle pin, eye, fork, and collar, allowing limited angular movement between the connected rods. This makes it ideal for applications where the alignment of the rods may vary or require flexibility, such as in linkages, tie rods, or tension members in structures. Knuckle joints are widely used in industries like 汽车，结构和重型机械由于其简单，强度和易于组装或拆卸。”