Definition

Noun: A rigid connecting rod that transmits force or motion to or from a piston within a cylinder. It is the component that links the piston to the rest of the machine mechanism, such as a crankshaft or crosshead.

Usage

The term "piston rod" is used specifically in mechanical and engineering contexts to describe a key component in engines, pumps, and compressors. It is a countable noun.

Examples

• The piston rod transfers the linear force from the expanding gases to the rotating crankshaft.
• A broken piston rod can cause catastrophic engine failure.
• The mechanic inspected the piston rod for signs of wear or bending.

Advanced Usage

• In large steam engines or some internal combustion engines, the piston rod is distinct from the connecting rod. It connects the piston to a crosshead, which is then linked to the connecting rod.
• The term can be used in a general sense for any rod attached to a piston, even in hydraulic or pneumatic cylinders, where it is often simply called a "rod."

Variants and Related Words

• Connecting Rod (noun): A rod that connects a piston to a crankshaft. In many common engines, the piston rod and connecting rod are a single integrated piece, so the terms are sometimes used interchangeably, though technically distinct in some designs.
• Wrist Pin / Gudgeon Pin (noun): The pin that connects the piston to the small end of the connecting rod (or piston rod).
• Crosshead (noun): A sliding bearing used in large engines, positioned between the piston rod and the connecting rod.

Synonyms

• Piston Connecting Rod (noun, technical)
• Piston Link (noun, less common)

Related Phrases

• Piston rod seal (noun phrase): The seal that prevents fluid leakage along the piston rod where it exits the cylinder.
• Piston rod gland (noun phrase): The assembly that houses the piston rod seal.

Noun

1. connecting rod that moves or is moved by a piston