First of all, the piston rod refers to a hollow piston rod with an annular cross section. In the case of the same material and the same cross-sectional area, the hollow piston rod has stronger torsion resistance and can withstand larger external moments. Under the same external torque, the hollow piston rod is less expensive than the solid piston rod.
In the automotive industry, the hollow shaft plays a very important and indispensable role. It not only has the highest potential coordination of natural bending frequency and torsional stiffness under the lowest weight. Moreover, the hollow shaft can adjust the natural bending frequency and torsional stiffness to the needs of users. At the same time, for most hollow shaft applications, shock absorbers are no longer needed, saving materials and reducing the overall weight of the car. The hollow piston rod is made of seamless steel pipe. Seamless steel pipe is a round, square and rectangular steel with a hollow section and no joints on the periphery. Seamless steel pipes are made of steel ingots or solid tube billets through perforation into capillary tubes, and then made by hot rolling, cold rolling or cold drawing. Seamless steel pipes have a hollow section and are mostly used as pipelines for conveying fluids. Compared with solid steel such as round steel, steel pipes have the same bending and torsion strength and lighter weight. They are economical cross-section steels and are widely used in manufacturing structures. Parts and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle frames, and steel scaffolding used in construction.
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