Piston Rod definition of Piston Rod in the Free Online Encyclopedia.

piston rod [′pis·tən ‚räd]

(mechanical engineering)

The rod which is connected to the piston, and moves or is moved by the piston.

Piston Rod

a round rod that connects a piston to a slide block in reciprocating machinery—for example, pumps, compressors, steam engines, and some internal-combustion engines—or in the hydraulic or pneumatic mechanism of a reciprocating drive. A piston rod is used when the compartments formed on both sides of a piston are employed. When only one of the compartments formed in a cylinder of a reciprocating machine is used, a piston rod is usually not provided and a connecting rod is connected directly to the piston.

A unilateral piston rod is located on one side of a piston and passes through one head cover. A bilateral piston rod passes through two head covers; such a piston rod is used to provide better alignment of a heavy piston in steam-driven machinery or to connect a second cylinder in a compressor.

In some reciprocating hydraulic drives, a cylinder is attached to the moving part, or table, of a machine and a piston rod is attached to the bed. Hydraulic fluid is supplied through the piston rod to the compartment formed in the cylinder.

The diameter of a piston rod is usually determined by the rod’s strength, stiffness, and stability. However, in reciprocating hydraulic drives, it is sometimes determined by the required velocity ratio of the to-and-fro motion at a constant pump capacity.

N. IA. NIBERG

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The slender expressive fingers, forever active, for- ever striving to conceal themselves in his pockets or behind his back, came forth and became the piston rods of his machinery of expression.

Winesberg, Ohio by Anderson, Sherwood View in context